Stator assembly, motor and vehicle

Abstract

The utility model discloses a stator assembly, a motor and a vehicle, the stator assembly comprises a stator iron core, the stator iron core is provided with a plurality of stator slots arranged at intervals along the circumferential direction of the stator iron core, and each stator slot is provided with M slot layers arranged in the radial direction; the stator winding comprises a first U-shaped hairpin and a second U-shaped hairpin which are different in span, the stator winding is used in a z-slot P-level m-phase motor, each branch of each phase comprises at least one first U-shaped hairpin and one second U-shaped hairpin, a first slot layer to an Mth slot layer are sequentially arranged in each stator slot in the radial direction, the first U-shaped hairpin and the second U-shaped hairpin are arranged in the first groove layer or the Mth groove layer in a penetrating mode, or the two ends of the first U-shaped hairpin and the two ends of the second U-shaped hairpin are arranged in the two adjacent groove layers in a penetrating mode respectively. According to the stator assembly provided by the utility model, the connection of the sub-coils through a connecting part in the related technology can be avoided, the process is simple, the manufacturing cost is reduced, and the occupied space is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field more particularly, relate to a kind of stator assembly, motor and vehicle. BACKGROUND

[0002] In the related art, the stator winding needs to increase an additional connection part, the sub-coil of the branch of the stator winding is connected through the connection part, which increases the occupied space, makes the process complex, and increases the manufacturing cost. UTILITY MODEL CONTENT

[0003] The utility model aims at at least one of the technical problems existing in the prior art. To this end, one object of the utility model is to provide a stator assembly, which can avoid the connection of sub-coils through the connection part in the related art, is simple in process, reduces manufacturing cost, and reduces the occupied space.

[0004] Another object of the utility model is to provide a motor with the above stator assembly.

[0005] Still another object of the utility model is to provide a vehicle with the above motor.

[0006] According to the stator assembly of the utility model embodiment, the stator core has a plurality of stator slots arranged at intervals along the circumferential direction of the stator core, and each stator slot has M slot layers arranged in the radial direction. The stator winding includes first and second U-shaped hairpins with different spans, and is used in a motor with z slots, P levels and m phases. Each branch of each phase includes at least one first U-shaped hairpin and one second U-shaped hairpin. First slot layers to Mth slot layers are arranged in the radial direction in each stator slot in sequence. The first U-shaped hairpin and the second U-shaped hairpin are both arranged in the first slot layer or the Mth slot layer, or the two ends of the first U-shaped hairpin and the second U-shaped hairpin are arranged in adjacent two slot layers, respectively.

[0007] According to the stator assembly of the utility model embodiment, the stator winding is used in a motor with z slots, P levels and m phases. Each branch of each phase includes at least one first U-shaped hairpin and one second U-shaped hairpin. The first U-shaped hairpin and the second U-shaped hairpin have different spans. The first U-shaped hairpin and the second U-shaped hairpin are both arranged in the first slot layer or the Mth slot layer, or the two ends of the first U-shaped hairpin and the second U-shaped hairpin are arranged in adjacent two slot layers, respectively. The spans of the first U-shaped hairpin and the second U-shaped hairpin of each branch of each phase are different, which facilitates the connection of the branches by misalignment. This avoids the connection of sub-coils through the connection part in the related art, makes the process simple, reduces manufacturing cost, and reduces the occupied space of the stator assembly.

[0008] In addition, the stator assembly according to the above-mentioned embodiments of the utility model can also have the following additional technical features:

[0009] According to the stator assembly of some embodiments of the utility model, the number of slots per pole per phase = z / P / m, the span of the first U-shaped hairpin = z / P-1, and the span of the second U-shaped hairpin = z / P+(the number of slots per pole per phase-1); or, the span of the first U-shaped hairpin = z / P+1, and the span of the second U-shaped hairpin = z / P-(the number of slots per pole per phase-1).

[0010] According to some embodiments of the utility model, when M is even, the second slot layer to the (M-1)th slot layer are divided into M / 2-1 groups arranged along the radial direction of the stator core, and when M is odd, the second slot layer to the Mth slot layer are divided into (M-1) / 2 groups arranged along the radial direction of the stator core, each group including two adjacent slot layers, and the stator winding includes: a third U-shaped hairpin, the first U-shaped hairpin and the second U-shaped hairpin are both arranged in the first slot layer or the Mth slot layer of the same group, and the two ends of the third U-shaped hairpin are arranged in two different slot layers of the same group; or, the two ends of the first U-shaped hairpin and the second U-shaped hairpin are arranged in two different slot layers of the same group, and the third U-shaped hairpin is arranged in the first slot layer or the Mth slot layer of the same group.

[0011] According to some embodiments of the utility model, the span of the third U-shaped hairpin < z / P; or, the span of the third U-shaped hairpin > z / P; or, the span of the third U-shaped hairpin = z / P.

[0012] According to some embodiments of the utility model, when M is even, the stator winding further includes: a fourth U-shaped hairpin, the span of the fourth U-shaped hairpin = z / P, when the first U-shaped hairpin and the second U-shaped hairpin are both arranged in the first slot layer of the same group, the fourth U-shaped hairpin is arranged in the Mth slot layer; or, when the first U-shaped hairpin and the second U-shaped hairpin are both arranged in the Mth slot layer of the same group, the fourth U-shaped hairpin is arranged in the first slot layer.

[0013] According to some embodiments of the utility model, z = 54, m = 3, P = 6, each of the 54 stator slots has 6 slot layers in sequence along the radial direction of the stator core, which are a first slot layer, a second slot layer, a third slot layer, a fourth slot layer, a fifth slot layer and a sixth slot layer, 3 phases include U phase, V phase and W phase,

[0014] The U phase first branch winding mode of the stator winding is as follows:

[0015] From the first slot layer, one end of the first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by z / P-1 slot positions, one end of the first third U-shaped hairpin is connected with the other end of the first first U-shaped hairpin, one end of the first third U-shaped hairpin is arranged in the second slot layer, the other end of the first third U-shaped hairpin is arranged in the third slot layer in the direction of increasing slot number by x slot positions, one end of the second third U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the fourth slot layer, the other end of the second third U-shaped hairpin is arranged in the fifth slot layer in the direction of increasing slot number by x slot positions, one end of the first fourth U-shaped hairpin is connected with the other end of the second third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer in the direction of increasing slot number by z / P slot positions,

[0016] From the sixth slot layer again, the third third U-shaped hairpin and the fourth third U-shaped hairpin are respectively rotated by z / P-1 slot positions in the direction of increasing slot number from the second third U-shaped hairpin and the first third U-shaped hairpin, wherein the other end of the first fourth U-shaped hairpin is connected with one end of the third third U-shaped hairpin, the other end of the third third U-shaped hairpin is connected with one end of the fourth third U-shaped hairpin, to form a first coil winding, and the winding is performed to all the stator slots in the same manner,

[0017] The winding mode of the second branch of the U phase of the stator winding is as follows:

[0018] From the third slot layer, one end of the first third U-shaped hairpin is arranged in the third slot layer, the other end of the first third U-shaped hairpin is arranged in the second slot layer in the direction of decreasing slot number by x slot positions, one end of the first first U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by z / P-1 slot positions,

[0019] From the first slot layer, a second third U-shaped hairpin is obtained by rotating the first third U-shaped hairpin by z / P-1 slot positions in a direction in which the slot number decreases, one end of the second third U-shaped hairpin is connected to the other end of the first first U-shaped hairpin, one end of a third third U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the third third U-shaped hairpin is arranged in the fourth slot layer, the other end of the third third U-shaped hairpin is arranged in the fifth slot layer by crossing x slot positions in a direction in which the slot number increases, one end of a first fourth U-shaped hairpin is connected to the other end of the third third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer by crossing z / P slot positions in a direction in which the slot number increases,

[0020] From the sixth slot layer, a fourth third U-shaped hairpin is obtained by rotating the third third U-shaped hairpin by z / P-1 slot positions in a direction in which the slot number increases, one end of the fourth third U-shaped hairpin is connected to the other end of the first fourth U-shaped hairpin, to form a first coil winding, and all the stator slots are wound in the same way,

[0021] The winding mode of the U-phase third branch of the stator winding is as follows:

[0022] From the fifth slot layer, one end of the first third U-shaped hairpin is arranged in the fifth slot layer, the other end of the first third U-shaped hairpin is arranged in the fourth slot layer by crossing x slot positions in a direction in which the slot number decreases, one end of a second third U-shaped hairpin is connected to the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the third slot layer, the other end of the second third U-shaped hairpin is arranged in the second slot layer by crossing x slot positions in a direction in which the slot number decreases, one end of the first first U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer by crossing z / P-1 slot positions in a direction in which the slot number decreases,

[0023] Starting from the first slot layer, the third and fourth third U-shaped hairpins are obtained by rotating the second and first third U-shaped hairpins by z / P-1 slots in the direction of decreasing slot number, respectively. One end of the first first U-shaped hairpin is connected to one end of the third third U-shaped hairpin, the other end of the third third U-shaped hairpin is connected to one end of the fourth third U-shaped hairpin, and one end of the first fourth U-shaped hairpin is connected to the other end of the fourth third U-shaped hairpin. One end of the first fourth U-shaped hairpin passes through the sixth slot layer, and the other end of the first fourth U-shaped hairpin spans z / P slots in the direction of increasing slot number in the sixth slot layer, forming the first winding. This winding is repeated in the same manner to all the stator slots.

[0024] In the second winding of the first, second, and third branches, one end of the second first U-shaped hairpin passes through the first slot layer, and the other end of the second first U-shaped hairpin spans z / P-1 slots in the first slot layer in the direction of decreasing slot number. In the third winding of the first, second, and third branches, one end of the first second U-shaped hairpin passes through the first slot layer, and the other end of the first second U-shaped hairpin spans z / P+(slot number per pole per phase - 1) slots in the first slot layer in the direction of decreasing slot number, where x < z / P, x > z / P, or x = z / P.

[0025] Alternatively, the U-phase first branch of the stator winding may be wound as follows:

[0026] Starting from the first slot layer, one end of the first second U-shaped hairpin passes through the first slot layer, and the other end of the first second U-shaped hairpin spans z / P - (number of slots per pole per phase - 1) slots in the first slot layer in the direction of decreasing slot number. One end of the first third U-shaped hairpin is connected to the other end of the first second U-shaped hairpin, and one end of the first third U-shaped hairpin passes through the second slot layer. The other end of the first third U-shaped hairpin spans x slots in the third slot layer in the direction of increasing slot number. The second... One end of the three U-shaped hairpins is connected to the other end of the first third U-shaped hairpin. One end of the second third U-shaped hairpin passes through the fourth slot layer. The other end of the second third U-shaped hairpin spans x slots in the fifth slot layer in the direction of increasing slot number. One end of the first fourth U-shaped hairpin is connected to the other end of the second third U-shaped hairpin. One end of the first fourth U-shaped hairpin passes through the sixth slot layer. The other end of the first fourth U-shaped hairpin spans z / P slots in the direction of increasing slot number in the sixth slot layer.

[0027] From the sixth slot layer again, the third and fourth third U-shaped hairpins are respectively obtained by rotating the second and first third U-shaped hairpins by z / P-1 slot positions in the direction of increasing slot number, wherein the other end of the first fourth U-shaped hairpin is connected with one end of the third third U-shaped hairpin, and the other end of the third third U-shaped hairpin is connected with one end of the fourth third U-shaped hairpin, to form the first round of winding, and the winding is performed to all the stator slots in the same manner,

[0028] The winding mode of the second branch of the U phase of the stator winding is as follows:

[0029] From the third slot layer, one end of the first third U-shaped hairpin is arranged in the third slot layer, and the other end of the first third U-shaped hairpin is arranged in the second slot layer by crossing x slot positions in the direction of decreasing slot number, one end of the first second U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the first second U-shaped hairpin is arranged in the first slot layer, and the other end of the first second U-shaped hairpin is arranged in the first slot layer by crossing z / P-(the number of slots per pole per phase-1) slot positions in the direction of decreasing slot number,

[0030] From the first slot layer again, the second third U-shaped hairpin is obtained by rotating the first third U-shaped hairpin by z / P-1 slot positions in the direction of decreasing slot number, one end of the second third U-shaped hairpin is connected with the other end of the first second U-shaped hairpin, one end of the third third U-shaped hairpin is connected with the other end of the second third U-shaped hairpin, one end of the third third U-shaped hairpin is arranged in the fourth slot layer, the other end of the third third U-shaped hairpin is arranged in the fifth slot layer by crossing x slot positions in the direction of increasing slot number, one end of the first fourth U-shaped hairpin is connected with the other end of the third third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, and the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer by crossing z / P slot positions in the direction of increasing slot number,

[0031] From the sixth slot layer again, the fourth third U-shaped hairpin is obtained by rotating the third third U-shaped hairpin by z / P-1 slot positions in the direction of increasing slot number, one end of the fourth third U-shaped hairpin is connected with the other end of the first fourth U-shaped hairpin, to form the first round of winding, and the winding is performed to all the stator slots in the same manner,

[0032] The winding mode of the third branch of the U phase of the stator winding is as follows:

[0033] From the fifth slot layer, one end of a first third U-shaped hairpin is arranged in the fifth slot layer, the other end of the first third U-shaped hairpin is arranged in the fourth slot layer in the direction of decreasing slot number by spanning x slot positions, one end of a second third U-shaped hairpin is connected to the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the third slot layer, the other end of the second third U-shaped hairpin is arranged in the second slot layer in the direction of decreasing slot number by spanning x slot positions, one end of a first second U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the first second U-shaped hairpin is arranged in the first slot layer, the other end of the first second U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by spanning z / P-(number of slots per pole per phase-1) slot positions,

[0034] From the first slot layer again, a third third U-shaped hairpin and a fourth third U-shaped hairpin are respectively rotated z / P-1 slot positions in the direction of decreasing slot number from the second third U-shaped hairpin and the first third U-shaped hairpin, wherein the other end of the first second U-shaped hairpin is connected to one end of the third third U-shaped hairpin, the other end of the third third U-shaped hairpin is connected to one end of the fourth third U-shaped hairpin, one end of a first fourth U-shaped hairpin is connected to the other end of the fourth third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer in the direction of increasing slot number by spanning z / P slot positions, to form the first coil winding, and the winding is performed to all the stator slots in the same manner,

[0035] In the second coil winding of the first branch, the second branch, and the third branch, one end of a first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by spanning z / P+1 slot positions, in the third coil winding of the first branch, the second branch, and the third branch, one end of a second first U-shaped hairpin is arranged in the first slot layer, the other end of the second first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by spanning z / P+1 slot positions, and x

[0036] Alternatively, the U-phase first branch winding mode of the stator winding is as follows:

[0037] From the first slot layer, one end of a first third U-shaped hairpin is arranged in the first slot layer, the other end of the first third U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by x slot positions, one end of a first first U-shaped hairpin is connected to the other end of the first third U-shaped hairpin, one end of the first first U-shaped hairpin is arranged in the second slot layer, the other end of the first first U-shaped hairpin is arranged in the third slot layer in the direction of increasing slot number by z / P+1 slot positions, one end of a second third U-shaped hairpin is connected to the other end of the first first U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the fourth slot layer, the other end of the second third U-shaped hairpin is arranged in the fifth slot layer in the direction of increasing slot number by x slot positions, one end of a first fourth U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer in the direction of increasing slot number by z / P slot positions,

[0038] From the sixth slot layer again, a third third U-shaped hairpin is obtained by rotating the second third U-shaped hairpin in the direction of increasing slot number by z / P-1 slot positions, the other end of the first fourth U-shaped hairpin is connected to one end of the third third U-shaped hairpin, one end of a fourth third U-shaped hairpin is arranged in the third slot layer, the other end of the fourth third U-shaped hairpin is arranged in the second slot layer in the direction of decreasing slot number by x slot positions, the other end of the third third U-shaped hairpin is connected to one end of the fourth third U-shaped hairpin, to form a first coil winding, and the winding is performed in the same manner to all the stator slots,

[0039] The winding mode of the second branch of the U phase of the stator winding is as follows:

[0040] From the third slot layer, one end of a first third U-shaped hairpin is arranged in the third slot layer, the other end of the first third U-shaped hairpin is arranged in the second slot layer in the direction of decreasing slot number by x slot positions, one end of a second third U-shaped hairpin is connected to the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the first slot layer, the other end of the second third U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by x slot positions,

[0041] From the first slot layer, one end of the first first U-shaped hairpin is arranged in the second slot layer, the other end of the first first U-shaped hairpin is connected with one end of the second third U-shaped hairpin, the other end of the first first U-shaped hairpin is arranged in the third slot layer in the direction of increasing slot number by z / P+1 slot positions, one end of the third third U-shaped hairpin is connected with the other end of the first first U-shaped hairpin, one end of the third third U-shaped hairpin is arranged in the fourth slot layer, the other end of the third third U-shaped hairpin is arranged in the fifth slot layer in the direction of increasing slot number by x slot positions, one end of the first fourth U-shaped hairpin is connected with the other end of the third third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer in the direction of increasing slot number by z / P slot positions,

[0042] From the sixth slot layer, the fourth third U-shaped hairpin is obtained by rotating the third third U-shaped hairpin in the direction of increasing slot number by z / P-1 slot positions, one end of the fourth third U-shaped hairpin is connected with the other end of the first fourth U-shaped hairpin, to form a first coil, and the winding is performed in the same manner to all the stator slots,

[0043] The winding mode of the U-phase third branch of the stator winding is as follows:

[0044] From the fifth slot layer, one end of the first third U-shaped hairpin is arranged in the fifth slot layer, the other end of the first third U-shaped hairpin is arranged in the fourth slot layer in the direction of decreasing slot number by x slot positions, one end of the second third U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the third slot layer, the other end of the second third U-shaped hairpin is arranged in the second slot layer in the direction of decreasing slot number by x slot positions, one end of the third third U-shaped hairpin is connected with the other end of the second third U-shaped hairpin, one end of the third third U-shaped hairpin is arranged in the first slot layer, and the other end of the third third U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by x slot positions,

[0045] From the first slot layer, one end of the first first U-shaped hairpin is arranged in the second slot layer, the other end of the first first U-shaped hairpin is connected with one end of the third third U-shaped hairpin, the other end of the first first U-shaped hairpin is arranged in the third slot layer in the direction of increasing slot number by z / P+1 slot positions, the fourth third U-shaped hairpin is obtained by rotating the first third U-shaped hairpin in the direction of decreasing slot number by z / P-1 slot positions, the other end of the first first U-shaped hairpin is connected with one end of the fourth third U-shaped hairpin, one end of the first fourth U-shaped hairpin is connected with the other end of the fourth third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer in the direction of increasing slot number by z / P slot positions, to form the first circle of winding, and the winding is performed to all the stator slots in the same manner,

[0046] In the second circle of winding of the first branch, the second branch and the third branch, one end of the second first U-shaped hairpin is arranged in the second slot layer, the other end of the second first U-shaped hairpin is arranged in the third slot layer in the direction of increasing slot number by z / P+1 slot positions, in the third circle of winding of the first branch, the second branch and the third branch, one end of the first second U-shaped hairpin is arranged in the second slot layer, the other end of the first second U-shaped hairpin is arranged in the third slot layer in the direction of increasing slot number by z / P-(the number of slots per pole per phase-1) slot positions, and x<z / P, x>z / P or x=z / P,

[0047] The winding methods of the U phase, the V phase and the W phase are the same, the winding method of the V phase winding is that the U phase winding is rotated by 3 slot positions in the direction of increasing slot number or in the direction of decreasing slot number, and the winding method of the W phase winding is that the U phase winding is rotated by 6 slot positions in the direction of increasing slot number or in the direction of decreasing slot number.

[0048] According to some embodiments of the utility model, z=54, m=3, P=6, each slot in the 54 stator slots has 7 slot layers, which are a first slot layer, a second slot layer, a third slot layer, a fourth slot layer, a fifth slot layer, a sixth slot layer and a seventh slot layer in the radial direction of the stator core in turn, and the three phases include a U phase, a V phase and a W phase,

[0049] The winding method of the U phase first branch of the stator winding is as follows:

[0050] From the first slot layer, one end of a first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by crossing z / P-1 slot positions, one end of a first third U-shaped hairpin is connected with the other end of the first first U-shaped hairpin, one end of the first third U-shaped hairpin is arranged in the second slot layer, the other end of the first third U-shaped hairpin is arranged in the third slot layer in the direction of increasing slot number by crossing x slot positions, one end of a second third U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the fourth slot layer, the other end of the second third U-shaped hairpin is arranged in the fifth slot layer in the direction of increasing slot number by crossing x slot positions, one end of a third third U-shaped hairpin is connected with the other end of the second third U-shaped hairpin, one end of the third third U-shaped hairpin is arranged in the sixth slot layer, the other end of the third third U-shaped hairpin is arranged in the seventh slot layer in the direction of increasing slot number by crossing x slot positions,

[0051] From the seventh slot layer again, a fourth third U-shaped hairpin, a fifth third U-shaped hairpin and a sixth third U-shaped hairpin are respectively obtained by rotating the third third U-shaped hairpin, the second third U-shaped hairpin and the first third U-shaped hairpin in the direction of increasing slot number by z / P-1 slot positions, wherein the other end of the third third U-shaped hairpin is connected with one end of the fourth third U-shaped hairpin, the other end of the fourth third U-shaped hairpin is connected with one end of the fifth third U-shaped hairpin, the other end of the fifth third U-shaped hairpin is connected with one end of the sixth third U-shaped hairpin, to form a first coil winding, and the winding is performed to all the stator slots in the same manner,

[0052] The winding mode of the second branch of the U phase of the stator winding is as follows:

[0053] From the third slot layer, one end of a first third U-shaped hairpin is arranged in the third slot layer, the other end of the first third U-shaped hairpin is arranged in the second slot layer in the direction of decreasing slot number by crossing x slot positions, one end of a first first U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by crossing z / P-1 slot positions,

[0054] From the first slot layer, a second third U-shaped hairpin is obtained by rotating the first third U-shaped hairpin by z / P-1 slot positions in a direction in which the slot number decreases, one end of the second third U-shaped hairpin is connected to the other end of the first first U-shaped hairpin, one end of a third third U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the third third U-shaped hairpin is arranged in the fourth slot layer, the other end of the third third U-shaped hairpin is arranged in the fifth slot layer by crossing x slot positions in a direction in which the slot number increases, one end of a fourth third U-shaped hairpin is connected to the other end of the third third U-shaped hairpin, one end of the fourth third U-shaped hairpin is arranged in the sixth slot layer, the other end of the fourth third U-shaped hairpin is arranged in the seventh slot layer by crossing x slot positions in a direction in which the slot number increases,

[0055] From the seventh slot layer, a fifth third U-shaped hairpin and a sixth third U-shaped hairpin are obtained by rotating the fourth third U-shaped hairpin and the third third U-shaped hairpin by z / P-1 slot positions in a direction in which the slot number increases, respectively, one end of the fifth third U-shaped hairpin is connected to the other end of the first fourth U-shaped hairpin, the other end of the fifth third U-shaped hairpin is connected to one end of the sixth third U-shaped hairpin, to form a first round of winding, and winding is performed in the same manner to all the stator slots,

[0056] The winding mode of the U-phase third branch of the stator winding is as follows:

[0057] From the fifth slot layer, one end of the first third U-shaped hairpin is arranged in the fifth slot layer, the other end of the first third U-shaped hairpin is arranged in the fourth slot layer by crossing x slot positions in a direction in which the slot number decreases, one end of a second third U-shaped hairpin is connected to the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the third slot layer, the other end of the second third U-shaped hairpin is arranged in the second slot layer by crossing x slot positions in a direction in which the slot number decreases, one end of the first first U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer by crossing z / P-1 slot positions in a direction in which the slot number decreases,

[0058] From the first slot layer, a third third U-shaped hairpin and a fourth third U-shaped hairpin are obtained by rotating a second third U-shaped hairpin and a first third U-shaped hairpin by z / P-1 slot positions in the direction of decreasing slot number, respectively, wherein the other end of the first first U-shaped hairpin is connected to one end of the third third U-shaped hairpin, the other end of the third third U-shaped hairpin is connected to one end of the fourth third U-shaped hairpin, one end of a fifth third U-shaped hairpin is connected to the other end of the fourth third U-shaped hairpin, one end of the fifth third U-shaped hairpin is arranged in the sixth slot layer, and the other end of the fifth third U-shaped hairpin is arranged in the seventh slot layer by z / P-1 slot positions in the direction of increasing slot number,

[0059] From the seventh slot layer, a sixth third U-shaped hairpin is obtained by rotating a fifth third U-shaped hairpin by z / P-1 slot positions in the direction of increasing slot number, one end of the sixth third U-shaped hairpin is connected to the other end of a first fourth U-shaped hairpin to form a first round of winding, and winding is performed in the same manner to all the stator slots,

[0060] In the second round of winding of the first branch, the second branch and the third branch, one end of a second first U-shaped hairpin is arranged in the first slot layer, the other end of the second first U-shaped hairpin is arranged in the first slot layer by z / P-1 slot positions in the direction of decreasing slot number, in the third round of winding of the first branch, the second branch and the third branch, one end of a first second U-shaped hairpin is arranged in the first slot layer, the other end of the first second U-shaped hairpin is arranged in the first slot layer by z / P+(the number of slots per pole per phase-1) slot positions in the direction of decreasing slot number, and x<z / P, x>z / P or x=z / P,

[0061] The winding methods of the U phase, the V phase and the W phase are the same, the winding method of the V phase winding is obtained by rotating the U phase winding by 3 slot positions in the direction of increasing slot number or in the direction of decreasing slot number, and the winding method of the W phase winding is obtained by rotating the U phase winding by 6 slot positions in the direction of increasing slot number or in the direction of decreasing slot number.

[0062] According to some embodiments of the utility model, z=54, m=3, P=6, each of the 54 stator slots has 8 slot layers, which are sequentially arranged along the radial direction of the stator core as a first slot layer, a second slot layer, a third slot layer, a fourth slot layer, a fifth slot layer, a sixth slot layer, a seventh slot layer and an eighth slot layer, and the three phases include a U phase, a V phase and a W phase,

[0063] The winding method of the U phase first branch of the stator winding is as follows:

[0064] From the first slot layer, one end of the first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by z / P-1 slot positions, one end of the first third U-shaped hairpin is connected with the other end of the first first U-shaped hairpin, one end of the first third U-shaped hairpin is arranged in the second slot layer, the other end of the first third U-shaped hairpin is arranged in the third slot layer in the direction of increasing slot number by x slot positions, one end of the second third U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the fourth slot layer, the other end of the second third U-shaped hairpin is arranged in the fifth slot layer in the direction of increasing slot number by x slot positions, one end of the third third U-shaped hairpin is connected with the other end of the second third U-shaped hairpin, one end of the third third U-shaped hairpin is arranged in the sixth slot layer, the other end of the third third U-shaped hairpin is arranged in the seventh slot layer in the direction of increasing slot number by x slot positions, one end of the first fourth U-shaped hairpin is connected with the other end of the third third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the eighth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the eighth slot layer in the direction of increasing slot number by z / P slot positions,

[0065] From the eighth slot layer again, the fourth third U-shaped hairpin, the fifth third U-shaped hairpin and the sixth third U-shaped hairpin are respectively obtained by rotating the third third U-shaped hairpin, the second third U-shaped hairpin and the first third U-shaped hairpin in the direction of increasing slot number by z / P-1 slot positions, wherein the other end of the third third U-shaped hairpin is connected with one end of the fourth third U-shaped hairpin, the other end of the fourth third U-shaped hairpin is connected with one end of the fifth third U-shaped hairpin, the other end of the fifth third U-shaped hairpin is connected with one end of the sixth third U-shaped hairpin, to form a first coil winding, and the winding is performed to all the stator slots in the same manner,

[0066] The winding mode of the second branch of the U phase of the stator winding is as follows:

[0067] From the third slot layer, one end of the first third U-shaped hairpin is arranged in the third slot layer, the other end of the first third U-shaped hairpin is arranged in the second slot layer in the direction of decreasing slot number by x slot positions, one end of the first first U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by z / P-1 slot positions,

[0068] From the first slot layer, a second third U-shaped hairpin is obtained by rotating the first third U-shaped hairpin by z / P-1 slot positions in a direction in which the slot number decreases, one end of the second third U-shaped hairpin is connected to the other end of the first first U-shaped hairpin, one end of a third third U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the third third U-shaped hairpin is arranged in the fourth slot layer, the other end of the third third U-shaped hairpin is arranged in the fifth slot layer by crossing x slot positions in a direction in which the slot number increases, one end of a fourth third U-shaped hairpin is connected to the other end of the third third U-shaped hairpin, one end of the fourth third U-shaped hairpin is arranged in the sixth slot layer, the other end of the fourth third U-shaped hairpin is arranged in the seventh slot layer by crossing x slot positions in a direction in which the slot number increases, one end of a first fourth U-shaped hairpin is connected to the other end of the fourth third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the eighth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the eighth slot layer by crossing z / P slot positions in a direction in which the slot number increases,

[0069] From the eighth slot layer, a fifth third U-shaped hairpin and a sixth third U-shaped hairpin are obtained by rotating the fourth third U-shaped hairpin and the third third U-shaped hairpin by z / P-1 slot positions in a direction in which the slot number increases, respectively, one end of the fifth third U-shaped hairpin is connected to the other end of the first fourth U-shaped hairpin, the other end of the fifth third U-shaped hairpin is connected to one end of the sixth third U-shaped hairpin, to form a first round of winding, and the winding is performed in the same manner to all the stator slots,

[0070] The winding mode of the U-phase third branch of the stator winding is as follows:

[0071] From the fifth slot layer, one end of the first third U-shaped hairpin is arranged in the fifth slot layer, the other end of the first third U-shaped hairpin is arranged in the fourth slot layer by crossing x slot positions in a direction in which the slot number decreases, one end of a second third U-shaped hairpin is connected to the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the third slot layer, the other end of the second third U-shaped hairpin is arranged in the second slot layer by crossing x slot positions in a direction in which the slot number decreases, one end of a first first U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer by crossing z / P-1 slot positions in a direction in which the slot number decreases,

[0072] From the first slot layer, a third third U-shaped hairpin and a fourth third U-shaped hairpin are obtained by rotating a second third U-shaped hairpin and a first third U-shaped hairpin by z / P-1 slot positions in the direction of decreasing slot number, respectively, wherein the other end of the first first U-shaped hairpin is connected to one end of the third third U-shaped hairpin, the other end of the third third U-shaped hairpin is connected to one end of the fourth third U-shaped hairpin, one end of a fifth third U-shaped hairpin is connected to the other end of the fourth third U-shaped hairpin, one end of the fifth third U-shaped hairpin is arranged in the sixth slot layer, the other end of the fifth third U-shaped hairpin is arranged in the seventh slot layer by crossing z / P-1 slot positions in the direction of increasing slot number, one end of the first fourth U-shaped hairpin is arranged in the eighth slot layer, and the other end of the first fourth U-shaped hairpin is arranged in the eighth slot layer by crossing z / P slot positions in the direction of increasing slot number,

[0073] From the eighth slot layer, a sixth third U-shaped hairpin is obtained by rotating a fifth third U-shaped hairpin by z / P-1 slot positions in the direction of increasing slot number, one end of the sixth third U-shaped hairpin is connected to the other end of the first fourth U-shaped hairpin to form a first loop of winding, and winding is performed in the same manner to all the stator slots,

[0074] In the second loop of winding of the first branch, the second branch and the third branch, one end of the second first U-shaped hairpin is arranged in the first slot layer, the other end of the second first U-shaped hairpin is arranged in the first slot layer by crossing z / P-1 slot positions in the direction of decreasing slot number, in the third loop of winding of the first branch, the second branch and the third branch, one end of the first second U-shaped hairpin is arranged in the first slot layer, the other end of the first second U-shaped hairpin is arranged in the first slot layer by crossing z / P+(the number of slots per pole per phase-1) slot positions in the direction of decreasing slot number, and x

[0075] The winding methods of the U phase, the V phase and the W phase are the same, the winding method of the V phase winding is obtained by rotating the U phase winding by 3 slot positions in the direction of increasing slot number or in the direction of decreasing slot number, and the winding method of the W phase winding is obtained by rotating the U phase winding by 6 slot positions in the direction of increasing slot number or in the direction of decreasing slot number.

[0076] According to some embodiments of the utility model, z=72, m=3, P=6, each of the 72 stator slots has 6 slot layers, which are sequentially arranged along the radial direction of the stator core as the first slot layer, the second slot layer, the third slot layer, the fourth slot layer, the fifth slot layer and the sixth slot layer, and the three phases include the U phase, the V phase and the W phase,

[0077] The winding method of the U phase first branch of the stator winding is as follows:

[0078] From the first slot layer, one end of the first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by z / P-1 slot positions, one end of the first third U-shaped hairpin is connected with the other end of the first first U-shaped hairpin, one end of the first third U-shaped hairpin is arranged in the second slot layer, the other end of the first third U-shaped hairpin is arranged in the third slot layer in the direction of increasing slot number by x slot positions, one end of the second third U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the fourth slot layer, the other end of the second third U-shaped hairpin is arranged in the fifth slot layer in the direction of increasing slot number by x slot positions, one end of the first fourth U-shaped hairpin is connected with the other end of the second third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer in the direction of increasing slot number by z / P slot positions,

[0079] From the sixth slot layer again, the third third U-shaped hairpin and the fourth third U-shaped hairpin are respectively rotated by z / P-1 slot positions in the direction of increasing slot number from the second third U-shaped hairpin and the first third U-shaped hairpin, wherein the other end of the first fourth U-shaped hairpin is connected with one end of the third third U-shaped hairpin, the other end of the third third U-shaped hairpin is connected with one end of the fourth third U-shaped hairpin, to form a first coil winding, and the winding is performed to all the stator slots in the same manner,

[0080] The winding mode of the second branch of the U phase of the stator winding is as follows:

[0081] From the third slot layer, one end of the first third U-shaped hairpin is arranged in the third slot layer, the other end of the first third U-shaped hairpin is arranged in the second slot layer in the direction of decreasing slot number by x slot positions, one end of the first first U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by z / P-1 slot positions,

[0082] From the first slot layer, a second third U-shaped hairpin is obtained by rotating the first third U-shaped hairpin by z / P-1 slot positions in a direction in which the slot number decreases, one end of the second third U-shaped hairpin is connected to the other end of the first first U-shaped hairpin, one end of a third third U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the third third U-shaped hairpin is arranged in the fourth slot layer, the other end of the third third U-shaped hairpin is arranged in the fifth slot layer by crossing x slot positions in a direction in which the slot number increases, one end of a first fourth U-shaped hairpin is connected to the other end of the third third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer by crossing z / P slot positions in a direction in which the slot number increases,

[0083] From the sixth slot layer, a fourth third U-shaped hairpin is obtained by rotating the third third U-shaped hairpin by z / P-1 slot positions in a direction in which the slot number increases, one end of the fourth third U-shaped hairpin is connected to the other end of the first fourth U-shaped hairpin, to form a first round of winding, and winding is performed in the same manner to all the stator slots,

[0084] The winding mode of the U-phase third branch of the stator winding is as follows:

[0085] From the fifth slot layer, one end of the first third U-shaped hairpin is arranged in the fifth slot layer, the other end of the first third U-shaped hairpin is arranged in the fourth slot layer by crossing x slot positions in a direction in which the slot number decreases, one end of a second third U-shaped hairpin is connected to the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the third slot layer, the other end of the second third U-shaped hairpin is arranged in the second slot layer by crossing x slot positions in a direction in which the slot number decreases, one end of the first first U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer by crossing z / P-1 slot positions in a direction in which the slot number decreases,

[0086] From the first slot layer, a third third U-shaped hairpin and a fourth third U-shaped hairpin are respectively rotated by z / P-1 slot positions in the direction of decreasing slot number from a second third U-shaped hairpin and a first third U-shaped hairpin, wherein one end of the first first U-shaped hairpin is connected to one end of the third third U-shaped hairpin, the other end of the third third U-shaped hairpin is connected to one end of the fourth third U-shaped hairpin, one end of the first fourth U-shaped hairpin is connected to the other end of the fourth third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, and the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer by z / P slot positions in the direction of increasing slot number, to form a first coil winding, and the coil winding is wound in the same way to all the stator slots.

[0087] In the second and third coil windings of the first, second and third branches, one end of the second first U-shaped hairpin and one end of the third first U-shaped hairpin are arranged in the first slot layer, and the other end of the second first U-shaped hairpin and the other end of the third first U-shaped hairpin are arranged in the first slot layer by z / P-1 slot positions in the direction of decreasing slot number, in the fourth coil winding of the first, second and third branches, one end of the first second U-shaped hairpin is arranged in the first slot layer, and the other end of the first second U-shaped hairpin is arranged in the first slot layer by z / P+(number of slots per pole per phase-1) slot positions in the direction of decreasing slot number, and x<z / P, x>z / P or x=z / P.

[0088] The winding methods of the U-phase, V-phase and W-phase are the same, the winding method of the V-phase winding is obtained by rotating the U-phase winding by 4 slot positions in the direction of increasing slot number or in the direction of decreasing slot number, and the winding method of the W-phase winding is obtained by rotating the U-phase winding by 8 slot positions in the direction of increasing slot number or in the direction of decreasing slot number.

[0089] According to some embodiments of the present application, M is greater than or equal to 8.

[0090] According to some embodiments of the present application, each phase includes m parallel branches, each of the m branches has a first connection end and a second connection end, the stator assembly includes: a neutral point copper plate, the neutral point copper plate includes a connecting portion and a branch portion, the connecting portion extends along the circumferential direction of the stator core, the branch portion is m and is arranged in the length direction of the connecting portion, each branch portion is connected to the m first connection ends of each phase; and a wire outlet structure, the wire outlet structure is m, each wire outlet structure is connected to the m second connection ends of each phase, the wire outlet structure and the neutral point copper plate are arranged on the same side of the stator core in the axial direction.

[0091] According to some embodiments of the utility model, the first connection end of the m branch circuits is led out from the same stator slot.

[0092] According to some embodiments of the utility model, m = 3, the three phases include U phase, V phase and W phase, each branch circuit of the U phase is located in a plurality of continuous stator slots, each branch circuit of the V phase is located in a plurality of continuous stator slots, each branch circuit of the W phase is located in a plurality of continuous stator slots, and the plurality of stator slots corresponding to the branch circuits of the U phase, the V phase and the W phase are continuously arranged.

[0093] According to some embodiments of the utility model, the wire outlet structure is an integral piece.

[0094] The motor according to the embodiments of the utility model comprises the stator assembly according to the embodiments of the utility model.

[0095] The motor according to the embodiments of the utility model is used in a motor with z slots, P levels and m phases, each branch circuit of each phase comprises at least one first U-shaped hairpin and one second U-shaped hairpin, the first U-shaped hairpin and the second U-shaped hairpin have different spans, and the first U-shaped hairpin and the second U-shaped hairpin are arranged in the first slot layer or the Mth slot layer or the two ends of the first U-shaped hairpin and the second U-shaped hairpin are arranged in adjacent two slot layers, so that the first U-shaped hairpin and the second U-shaped hairpin of each branch circuit of each phase have different spans, the branch circuits are easily dislocated to realize connection when connected, the connection of the sub-coils is realized by the connection part in the related art, the process is simple, the manufacturing cost can be reduced, and the occupied space of the stator assembly can be reduced.

[0096] The vehicle according to the embodiments of the utility model comprises the motor according to the embodiments of the utility model.

[0097] The vehicle according to the embodiments of the utility model is used in a motor with z slots, P levels and m phases, each branch circuit of each phase comprises at least one first U-shaped hairpin and one second U-shaped hairpin, the first U-shaped hairpin and the second U-shaped hairpin have different spans, and the first U-shaped hairpin and the second U-shaped hairpin are arranged in the first slot layer or the Mth slot layer or the two ends of the first U-shaped hairpin and the second U-shaped hairpin are arranged in adjacent two slot layers, so that the first U-shaped hairpin and the second U-shaped hairpin of each branch circuit of each phase have different spans, the branch circuits are easily dislocated to realize connection when connected, the connection of the sub-coils is realized by the connection part in the related art, the process is simple, the manufacturing cost can be reduced, and the occupied space of the stator assembly can be reduced.

[0098] Additional aspects and advantages of the utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0099] The above and / or additional aspects and advantages of the present utility model will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the references to the following drawings of which:

[0100] Figure 1 is a structural schematic view of one angle of the stator assembly according to the embodiment of the present utility model;

[0101] Figure 2 is a structural schematic view of another angle of the stator assembly according to the embodiment of the present utility model;

[0102] Figure 3 is a U-phase winding route schematic view of the stator winding of the stator assembly according to the first embodiment of the present utility model;

[0103] Figure 4 is a V-phase winding route schematic view of the stator winding of the stator assembly according to the first embodiment of the present utility model;

[0104] Figure 5 is a W-phase winding route schematic view of the stator winding of the stator assembly according to the first embodiment of the present utility model;

[0105] Figure 6 is a U-phase winding route schematic view of the stator winding of the stator assembly according to the second embodiment of the present utility model;

[0106] Figure 7 is a U-phase winding route schematic view of the stator winding of the stator assembly according to the third embodiment of the present utility model;

[0107] Figure 8 is a U-phase winding route schematic view of the stator winding of the stator assembly according to the fourth embodiment of the present utility model;

[0108] Figure 9 is a U-phase winding route schematic view of the stator winding of the stator assembly according to the fifth embodiment of the present utility model;

[0109] Figure 10 is a U-phase winding route schematic view of the stator winding of the stator assembly according to the sixth embodiment of the present utility model;

[0110] Figure 11 is a U-phase winding route schematic view of the stator winding of the stator assembly according to the seventh embodiment of the present utility model;

[0111] Figure 12 is a U-phase winding route schematic view of the stator winding of the stator assembly according to the eighth embodiment of the present utility model.

[0112] Reference signs:

[0113] 100, stator assembly;

[0114] 10, stator core; 11, stator slot;

[0115] 20, stator winding; 21, first U-shaped hairpin; 22, second U-shaped hairpin; 23, third U-shaped hairpin; 24, fourth U-shaped hairpin;

[0116] 31, first connecting end; 32, second connecting end;

[0117] 40, neutral point copper bar; 41, connecting portion; 42, branch portion;

[0118] 50, outgoing line structure. DETAILED DESCRIPTION

[0119] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as a limitation of the present application.

[0120] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0121] In the description of the present application, "first feature", "second feature" can include one or more features, "a plurality of" means two or more, and "above" or "below" of the first feature to the second feature can include direct contact of the first and second features, or can include indirect contact of the first and second features through another feature therebetween, and "above", "above" and "above" of the first feature to the second feature include the first feature directly above and obliquely above the second feature, or only indicate that the first feature is higher than the second feature in horizontal height.

[0122] The stator assembly 100 according to the embodiments of the present application is described below with reference to the drawings.

[0123] Referring to Figure 1 With Figure 2As shown, the stator assembly 100 according to the embodiment of the utility model can include: a stator core 10 and a stator winding 20.

[0124] Specifically, the stator core 10 has a plurality of (equal to or greater than two) stator slots 11, the plurality of stator slots 11 are arranged at intervals along the circumferential direction of the stator core 10, each stator slot 11 has M slot layers arranged in the radial direction, by having M slot layers in each of the plurality of stator slots 11, different winding layouts can be allowed, the different setting requirements of the stator assembly 100 can be met, and the flexibility of the design of the stator assembly 100 can be realized.

[0125] In addition, as shown, Figures 3-12 The stator winding 20 includes a first U-shaped hairpin 21 and a second U-shaped hairpin 22, the spans of the first U-shaped hairpin 21 and the second U-shaped hairpin 22 are different, the stator winding 20 is used in a motor of z-slot P-level m-phase, each branch of each phase includes at least one first U-shaped hairpin 21 and one second U-shaped hairpin 22, each stator slot 11 has first slot layer to M slot layer arranged in the radial direction in sequence, the first U-shaped hairpin 21 and the second U-shaped hairpin 22 are both arranged in the first slot layer, or the first U-shaped hairpin 21 and the second U-shaped hairpin 22 are both arranged in the M slot layer, or the two ends of the first U-shaped hairpin 21 and the second U-shaped hairpin 22 are arranged in the adjacent two slot layers, and the winding requirement of the stator winding 20 in the stator core 10 can be realized.

[0126] Therefore, by the different spans of the first U-shaped hairpin 21 and the second U-shaped hairpin 22 of each branch of each phase, the branches can be staggered when connected, the connection between them is facilitated, the connection of the sub-coil is realized by the connection part in the related art is avoided, thereby the connection structure of the sub-coil can be reduced, the process is simple, the manufacturing cost can be reduced, the wire outlet space of the stator assembly 100 can be reduced, the volume of the stator assembly 100 can be reduced, and the occupied space of the stator assembly 100 can be reduced.

[0127] It should be noted that the "span" refers to the difference between two slot numbers, for example, the span between the two stator slots 11 is 8, if one end of the first U-shaped hairpin 21 is inserted into the first stator slot, the other end is inserted into the ninth stator slot, wherein the initially inserted stator slot 11 is the first stator slot, the explanation of "span" will continue below. In addition, since the stator core 10 is a circular type, in a 54-slot motor, the first stator slot and the 54th stator slot are arranged adjacent to each other.

[0128] Wherein, the stator winding 20 is used in a motor of z-slot P-pole m-phase, the slot number z can be 36, 54, 72, etc., and the phase number m can be three-phase, two-phase or single-phase. For example, the stator winding 20 is used in a motor of 6-pole 54-slot 3-phase, that is, the stator slot number z=54 and the phase number m=3, wherein the three phases include U phase, V phase and W phase, and the pole number P=6, which can be set according to the specific applicable motor.

[0129] In some embodiments, the slot number z=Pnm, wherein n is an integer greater than 0, which can realize the setting of different slot numbers to meet the different setting requirements of the motor, and the more the slot numbers are, the better the effect of the motor is, which can meet different use requirements. For example, when the stator winding 20 is used in a motor of 6-pole 3-phase, the slot number can be 18, 36, 54, 72, 90, etc.

[0130] In some embodiments, the stator winding 20 adopts a flat copper wire, which can more closely fill the space of the stator slot 11, effectively improve the slot fill rate, thereby improving the power density and efficiency of the motor, and meeting different use requirements.

[0131] According to the stator assembly 100 of the embodiment of the utility model, the stator winding 20 is used in a motor of z-slot P-pole m-phase, each branch of each phase includes at least one first U-shaped hairpin 21 and one second U-shaped hairpin 22, the first U-shaped hairpin 21 and the second U-shaped hairpin 22 have different spans, and the first U-shaped hairpin 21 and the second U-shaped hairpin 22 are both arranged in the first slot layer or the Mth slot layer, or the two ends of the first U-shaped hairpin 21 and the second U-shaped hairpin 22 are arranged in the adjacent two slot layers, so that the spans of the first U-shaped hairpin 21 and the second U-shaped hairpin 22 of each branch of each phase are different, which facilitates the connection of the branch to produce a misalignment to realize the connection, avoids the connection of the sub-coil through the connecting part in the related art, makes the process simple, can reduce the manufacturing cost, and can reduce the occupied space of the stator assembly 100.

[0132] In the embodiment of the utility model, the specific span of the first U-shaped hairpin 21 and the second U-shaped hairpin 22 can be set according to the actual situation.

[0133] For example, in some embodiments, as shown in Figures 3-10 The slot number per pole per phase is z / P / m, the span of the first U-shaped hairpin 21 is z / P-1, and the span of the second U-shaped hairpin 22 is z / P+(slot number per pole per phase-1), so that the spans of the first U-shaped hairpin 21 and the second U-shaped hairpin 22 are different, which can be set according to the actual situation, can meet different span requirements, and ensures that the stator winding 20 is reliably wound on the stator core 10.

[0134] For example, in some embodiments, as shown in Figure 11 And Figure 12As shown, the number of slots per pole per phase = z / P / m, the span of the first U-shaped hairpin 21 = z / P+1, and the span of the second U-shaped hairpin 22 = z / P-(the number of slots per pole per phase-1), so that the spans of the first U-shaped hairpin 21 and the second U-shaped hairpin 22 are different, which can be set according to actual conditions to meet different span requirements, and ensure that the stator winding 20 is reliably wired on the stator core 10,

[0135] In some embodiments of the utility model, as shown in the figure, Figures 3-10 As shown, when M is even, the second slot layer to the (M-1)th slot layer are divided into M / 2-1 groups arranged along the radial direction of the stator core 10, and when M is odd, the second slot layer to the Mth slot layer are divided into (M-1) / 2 groups arranged along the radial direction of the stator core 10, each group including two adjacent slot layers. The stator winding 20 includes a third U-shaped hairpin 23, the first U-shaped hairpin 21 and the second U-shaped hairpin 22 are both arranged in the first slot layer or the Mth slot layer of the same group, and the two ends of the third U-shaped hairpin 23 are arranged in two different slot layers of the same group, which can realize the arrangement requirements of the first U-shaped hairpin 21, the second U-shaped hairpin 22 and the third U-shaped hairpin 23 on the stator core 10; or, the two ends of the first U-shaped hairpin 21 and the second U-shaped hairpin 22 are arranged in two different slot layers of the same group, and the third U-shaped hairpin 23 is arranged in the first slot layer or the Mth slot layer of the same group, which can realize the arrangement requirements of the first U-shaped hairpin 21, the second U-shaped hairpin 22 and the third U-shaped hairpin 23 on the stator core 10, and both facilitate the placement of the third U-shaped hairpin 23 on the stator core 10, which can realize the winding requirements of the stator core 10, facilitate the winding flexibility of the stator winding 20, and realize different use requirements.

[0136] In the embodiments of the utility model, the span of the third U-shaped hairpin 23 can be set according to actual conditions.

[0137] For example, in some embodiments, the span of the third U-shaped hairpin 23 < z / P, so that the third U-shaped hairpin 23 forms a short-pitch winding; or, the span of the third U-shaped hairpin 23 > z / P, so that the third U-shaped hairpin 23 forms a long-pitch winding; or, the span of the third U-shaped hairpin 23 = z / P, so that the third U-shaped hairpin 23 forms a full-pitch winding, which can realize different combination forms of the stator winding 20, provide greater freedom for the design of the stator winding 20, and can be adjusted according to the specific performance requirements of the motor.

[0138] In some embodiments, as shown in the figure, Figures 3-12As shown, the third U-shaped hairpin 23 can be multiple (equal to or greater than two), and the multiple third U-shaped hairpins 23 can meet the required winding requirements, and the spans of the multiple third U-shaped hairpins 23 can be different and can be set according to actual conditions, for example, the spans of some third U-shaped hairpins 23 in the multiple third U-shaped hairpins 23 < z / P, the spans of some third U-shaped hairpins 23 in the multiple third U-shaped hairpins 23 > z / P, and the spans of some third U-shaped hairpins 23 in the multiple third U-shaped hairpins 23 = z / P, which can meet different assembly requirements.

[0139] According to some embodiments of the utility model, as shown in Figures 3-7 , Figure 9 and Figure 10 As shown, when M is even, the stator winding 20 further includes a fourth U-shaped hairpin 24, the span of the fourth U-shaped hairpin 24 = z / P, when the first U-shaped hairpin 21 and the second U-shaped hairpin 22 are both arranged in the same group of first slot layers, the fourth U-shaped hairpin 24 is arranged in the Mth slot layer; or, when the first U-shaped hairpin 21 and the second U-shaped hairpin 22 are both arranged in the same group of Mth slot layers, the fourth U-shaped hairpin 24 is arranged in the first slot layer, both of which facilitate the placement of the fourth U-shaped hairpin 24 on the stator core 10, can meet the winding requirements of the stator core 10, meet the winding requirements of the Mth slot when M is even, and increase the winding flexibility of the stator winding 20.

[0140] In the related art, the stator winding scheme has many types of U-shaped hairpin wire types, which increases the process complexity and process cost, the outlet structure is complex, occupies a large space, and different molds need to be developed for different U-shaped hairpin wire types, which has high manufacturing cost, and at the same time, the multiple wire types easily lead to poor scalability of the motor scheme.

[0141] Therefore, in some embodiments of the utility model, as shown in Figures 3-7 As shown, z = 54, m = 3, P = 6, each slot in the 54 stator slots 11 has 6 slot layers, which are sequentially first, second, third, fourth, fifth and sixth slot layers along the radial direction of the stator core 10, and the 3 phases include U, V and W phases.

[0142] The U-phase first branch winding mode of the stator winding 20 is as follows:

[0143] From the first slot layer, one end of the first first U-shaped hairpin 21 is arranged in the first slot layer, the other end of the first first U-shaped hairpin 21 is arranged in the first slot layer in the direction of decreasing slot number by z / P-1 slot positions, one end of the first third U-shaped hairpin 23 is connected with the other end of the first first U-shaped hairpin 21, one end of the first third U-shaped hairpin 23 is arranged in the second slot layer, the other end of the first third U-shaped hairpin 23 is arranged in the third slot layer in the direction of increasing slot number by x slot positions, one end of the second third U-shaped hairpin 23 is connected with the other end of the first third U-shaped hairpin 23, one end of the second third U-shaped hairpin 23 is arranged in the fourth slot layer, the other end of the second third U-shaped hairpin 23 is arranged in the fifth slot layer in the direction of increasing slot number by x slot positions, one end of the first fourth U-shaped hairpin 24 is connected with the other end of the second third U-shaped hairpin 23, one end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer in the direction of increasing slot number by z / P slot positions,

[0144] From the sixth slot layer again, the third third U-shaped hairpin 23 and the fourth third U-shaped hairpin 23 are respectively rotated by z / P-1 slot positions in the direction of increasing slot number from the second third U-shaped hairpin 23 and the first third U-shaped hairpin 23, wherein the other end of the first fourth U-shaped hairpin 24 is connected with one end of the third third U-shaped hairpin 23, the other end of the third third U-shaped hairpin 23 is connected with one end of the fourth third U-shaped hairpin 23, to form a first coil of winding, and the winding is performed to all stator slots 11 in the same way.

[0145] Therefore, one winding of the U-phase first branch of the stator winding 20 is realized, the winding requirement on the stator core 10 can be realized, each stator slot 11 is wound in six layers, the space utilization rate can be improved, and the efficiency and thermal stability of the motor can be ensured. At the same time, x < z / P, x > z / P or x = z / P, different choices of the span of the third U-shaped hairpin 23 can be realized, greater freedom is provided for the design of the stator winding 20, different use requirements can be met, and adjustment can be facilitated according to the specific performance requirements of the motor.

[0146] In the second winding of the first branch, one end of the second first U-shaped hairpin 21 is arranged in the first slot layer, and the other end of the second first U-shaped hairpin 21 is arranged in the first slot layer in the direction of decreasing slot number by crossing z / P-1 slot positions, in the third winding of the first branch, one end of the first second U-shaped hairpin 22 is arranged in the first slot layer, and the other end of the first second U-shaped hairpin 22 is arranged in the first slot layer in the direction of decreasing slot number by crossing z / P+(the number of slots per pole per phase-1) slot positions, which can cause misalignment when the first, second and third windings are connected, facilitating connection between each other, avoiding the connection of sub-coils through the connection part in the related art, reducing the connection structure of the sub-coil, making the process simple, and reducing the manufacturing cost, reducing the occupied space of the stator assembly 100.

[0147] In addition, in the U-phase first branch of the stator winding 20, only four U-shaped hairpin wire types (i.e., the first U-shaped hairpin 21, the second U-shaped hairpin 22, the third U-shaped hairpin 23, and the fourth U-shaped hairpin 24) are used to realize the winding of the stator core 10, thereby realizing the few wire type structure design of the stator winding 20, facilitating the saving of wire type mold cost and production rhythm, making the manufacturing simple, and reducing the manufacturing cost.

[0148] The U-phase second branch of the stator winding 20 is wound as follows:

[0149] From the third slot layer, one end of the first third U-shaped hairpin 23 is arranged in the third slot layer, and the other end of the first third U-shaped hairpin 23 is arranged in the second slot layer in the direction of decreasing slot number by crossing x slot positions, one end of the first first U-shaped hairpin 21 is connected to the other end of the first third U-shaped hairpin 23, one end of the first first U-shaped hairpin 21 is arranged in the first slot layer, and the other end of the first first U-shaped hairpin 21 is arranged in the first slot layer in the direction of decreasing slot number by crossing z / P-1 slot positions,

[0150] From the first slot layer again, the second third U-shaped hairpin 23 is obtained by rotating the first third U-shaped hairpin 23 in the direction of decreasing slot number by z / P-1 slot positions, one end of the second third U-shaped hairpin 23 is connected to the other end of the first first U-shaped hairpin 21, one end of the third third U-shaped hairpin 23 is connected to the other end of the second third U-shaped hairpin 23, one end of the third third U-shaped hairpin 23 is arranged in the fourth slot layer, the other end of the third third U-shaped hairpin 23 is arranged in the fifth slot layer in the direction of increasing slot number by crossing x slot positions, one end of the first fourth U-shaped hairpin 24 is connected to the other end of the third third U-shaped hairpin 23, one end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer, and the other end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer in the direction of increasing slot number by crossing z / P slot positions,

[0151] From the sixth slot layer, a fourth third U-shaped hairpin 23 is obtained by rotating the third third U-shaped hairpin 23 in the direction of increasing slot number by z / P-1 slot positions, one end of the fourth third U-shaped hairpin 23 is connected to the other end of the first fourth U-shaped hairpin 24 to form the first circle of winding, and the winding is wound in the same way to all the stator slots 11.

[0152] Thus, one winding of the U-phase second branch of the stator winding 20 is realized, the winding requirement on the stator core 10 can be realized, and each stator slot 11 is wound in six layers, which can improve the space utilization rate and ensure the efficiency and thermal stability of the motor. At the same time, x < z / P, x > z / P or x = z / P, different choices of the span of the third U-shaped hairpin 23 can be realized, which provides greater freedom for the design of the stator winding 20 and can meet different use requirements, facilitating adjustment according to the specific performance requirements of the motor.

[0153] In the second circle of winding of the second branch, one end of the second first U-shaped hairpin 21 is provided in the first slot layer, the other end of the second first U-shaped hairpin 21 is provided in the first slot layer by spanning z / P-1 slot positions in the direction of decreasing slot number, and in the third circle of winding of the second branch, one end of the first second U-shaped hairpin 22 is provided in the first slot layer, the other end of the first second U-shaped hairpin 22 is provided in the first slot layer by spanning z / P+(number of slots per pole per phase-1) slot positions in the direction of decreasing slot number, which can cause the first, second and third circles to be misaligned when connected, facilitating connection between each other, avoiding the connection of sub-coils by the connection part in the related art, reducing the connection structure of the sub-coil, making the process simple, and reducing the manufacturing cost and the occupied space of the stator assembly 100.

[0154] In addition, in the U-phase second branch of the stator winding 20, only four U-shaped hairpin wire types (i.e. the first U-shaped hairpin 21, the second U-shaped hairpin 22, the third U-shaped hairpin 23 and the fourth U-shaped hairpin 24) are used to realize the winding of the stator core 10, thereby realizing the few wire type structure design of the stator winding 20, facilitating the saving of wire type mold cost and production rhythm, making the manufacturing simple, and reducing the manufacturing cost.

[0155] The winding mode of the U-phase third branch of the stator winding 20 is as follows:

[0156] From the fifth slot layer, one end of the first third U-shaped hairpin 23 is arranged in the fifth slot layer, the other end of the first third U-shaped hairpin 23 is arranged in the fourth slot layer in the direction of decreasing slot number by crossing x slot positions, one end of the second third U-shaped hairpin 23 is connected with the other end of the first third U-shaped hairpin 23, one end of the second third U-shaped hairpin 23 is arranged in the third slot layer, the other end of the second third U-shaped hairpin 23 is arranged in the second slot layer in the direction of decreasing slot number by crossing x slot positions, one end of the first first U-shaped hairpin 21 is connected with the other end of the second third U-shaped hairpin 23, one end of the first first U-shaped hairpin 21 is arranged in the first slot layer, the other end of the first first U-shaped hairpin 21 is arranged in the first slot layer in the direction of decreasing slot number by crossing z / P-1 slot positions,

[0157] From the first slot layer again, the third third U-shaped hairpin 23 and the fourth third U-shaped hairpin 23 are respectively rotated by z / P-1 slot positions in the direction of decreasing slot number from the second third U-shaped hairpin 23 and the first third U-shaped hairpin 23, wherein the other end of the first first U-shaped hairpin 21 is connected with one end of the third third U-shaped hairpin 23, the other end of the third third U-shaped hairpin 23 is connected with one end of the fourth third U-shaped hairpin 23, one end of the first fourth U-shaped hairpin 24 is connected with the other end of the fourth third U-shaped hairpin 23, one end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer in the direction of increasing slot number by crossing z / P slot positions, to form a first coil winding, and the winding is performed to all stator slots 11 in the same way.

[0158] Therefore, one winding of the U-phase third branch of the stator winding 20 is realized, the winding requirement on the stator core 10 can be realized, each stator slot 11 is wound in six layers, the space utilization rate can be improved, and the efficiency and thermal stability of the motor are ensured. At the same time, x < z / P, x > z / P or x = z / P, different choices of the span of the third U-shaped hairpin 23 can be realized, greater freedom is provided for the design of the stator winding 20, different use requirements can be met, and adjustment can be facilitated according to the specific performance requirements of the motor.

[0159] In the second coil winding of the third branch, one end of the second first U-shaped hairpin 21 is arranged in the first slot layer, and the other end of the second first U-shaped hairpin 21 is arranged in the first slot layer in the direction of decreasing slot number by crossing z / P-1 slot positions, and in the third coil winding of the third branch, one end of the first second U-shaped hairpin 22 is arranged in the first slot layer, and the other end of the first second U-shaped hairpin 22 is arranged in the first slot layer in the direction of decreasing slot number by crossing z / P+(the number of slots per pole per phase-1) slot positions, so that the first coil, the second coil and the third coil are misaligned when connected, facilitating connection between each other, avoiding the connection of sub-coils through the connection part in the related art, reducing the connection structure of the sub-coil, making the process simple, reducing the manufacturing cost, and reducing the occupied space of the stator assembly 100.

[0160] In addition, in the U-phase third branch of the stator winding 20, only four U-shaped hairpin wire types (i.e., the first U-shaped hairpin 21, the second U-shaped hairpin 22, the third U-shaped hairpin 23 and the fourth U-shaped hairpin 24) are used to realize the winding of the stator core 10, thereby realizing the few wire type structure design of the stator winding 20, facilitating the saving of wire type mold cost and production rhythm, making the manufacturing simple, and reducing the manufacturing cost.

[0161] Therefore, the U-phase winding is divided into three branches for winding, ensuring the uniform distribution of current in the stator slot 11, reducing the generation of unbalanced current, and improving the running stability and reliability of the motor.

[0162] Alternatively, the U-phase first branch of the stator winding 20 is wound as follows:

[0163] Starting from the first slot layer, one end of the first second U-shaped hairpin 22 is arranged in the first slot layer, and the other end of the first second U-shaped hairpin 22 is arranged in the first slot layer in the direction of decreasing slot number by crossing z / P-(the number of slots per pole per phase-1) slot positions, one end of the first third U-shaped hairpin 23 is connected with the other end of the first second U-shaped hairpin 22, one end of the first third U-shaped hairpin 23 is arranged in the second slot layer, and the other end of the first third U-shaped hairpin 23 is arranged in the third slot layer in the direction of increasing slot number by crossing x slot positions, one end of the second third U-shaped hairpin 23 is connected with the other end of the first third U-shaped hairpin 23, one end of the second third U-shaped hairpin 23 is arranged in the fourth slot layer, and the other end of the second third U-shaped hairpin 23 is arranged in the fifth slot layer in the direction of increasing slot number by crossing x slot positions, one end of the first fourth U-shaped hairpin 24 is connected with the other end of the second third U-shaped hairpin 23, one end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer, and the other end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer in the direction of increasing slot number by crossing z / P slot positions,

[0164] From the sixth slot layer, the third third U-shaped hairpin 23 and the fourth third U-shaped hairpin 23 are respectively rotated z / P-1 slot positions in the direction of increasing slot number from the second third U-shaped hairpin 23 and the first third U-shaped hairpin 23, wherein the other end of the first fourth U-shaped hairpin 24 is connected to one end of the third third U-shaped hairpin 23, and the other end of the third third U-shaped hairpin 23 is connected to one end of the fourth third U-shaped hairpin 23, forming the first winding of the wire. In the same way, the wire is wound to all stator slots 11.

[0165] Thus, one winding of the U-phase first branch of the stator winding 20 is realized, the winding requirement on the stator core 10 can be realized, and each stator slot 11 is wound in six layers, which can improve the space utilization and ensure the efficiency and thermal stability of the motor. At the same time, x < z / P, x > z / P or x = z / P, different choices of the span of the third U-shaped hairpin 23 can be realized, which provides greater freedom for the design of the stator winding 20 and can meet different use requirements. It is convenient to adjust according to the specific performance requirements of the motor.

[0166] In the second winding of the first branch, one end of the first first U-shaped hairpin 21 is provided in the first slot layer, and the other end of the first first U-shaped hairpin 21 is provided in the first slot layer by spanning z / P+1 slot positions in the direction of decreasing slot number. In the third winding of the first branch, one end of the second first U-shaped hairpin 21 is provided in the first slot layer, and the other end of the second first U-shaped hairpin 21 is provided in the first slot layer by spanning z / P+1 slot positions in the direction of decreasing slot number. This can cause the first, second and third to be misaligned when connected, which facilitates connection between each other, avoids the connection of sub-coils by the connection part in the related art, reduces the connection structure of the sub-coil, simplifies the process, and reduces the manufacturing cost and the occupied space of the stator assembly 100.

[0167] In addition, in the U-phase first branch of the stator winding 20, only four U-shaped hairpin wire types (i.e. the first U-shaped hairpin 21, the second U-shaped hairpin 22, the third U-shaped hairpin 23 and the fourth U-shaped hairpin 24) are used to realize the winding of the stator core 10, thereby realizing the few wire type structure design of the stator winding 20, saving the cost of wire type mold and production rhythm, making the manufacturing simple, and reducing the manufacturing cost.

[0168] The U-phase second branch of the stator winding 20 is wound as follows:

[0169] From the third slot layer, one end of the first third U-shaped hairpin 23 is arranged in the third slot layer, the other end of the first third U-shaped hairpin 23 is arranged in the second slot layer in the direction of decreasing slot number by spanning x slot positions, one end of the first second U-shaped hairpin 22 is connected with the other end of the first third U-shaped hairpin 23, one end of the first second U-shaped hairpin 22 is arranged in the first slot layer, the other end of the first second U-shaped hairpin 22 is arranged in the first slot layer in the direction of decreasing slot number by spanning z / P-(number of slots per pole per phase-1) slot positions,

[0170] From the first slot layer again, the second third U-shaped hairpin 23 is obtained by rotating the first third U-shaped hairpin 23 in the direction of decreasing slot number by z / P-1 slot positions, one end of the second third U-shaped hairpin 23 is connected with the other end of the first first U-shaped hairpin 21, one end of the third third U-shaped hairpin 23 is connected with the other end of the second third U-shaped hairpin 23, one end of the third third U-shaped hairpin 23 is arranged in the fourth slot layer, the other end of the third third U-shaped hairpin 23 is arranged in the fifth slot layer in the direction of increasing slot number by spanning x slot positions, one end of the first fourth U-shaped hairpin 24 is connected with the other end of the third third U-shaped hairpin 23, one end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer in the direction of increasing slot number by spanning z / P slot positions,

[0171] From the sixth slot layer again, the fourth third U-shaped hairpin 23 is obtained by rotating the third third U-shaped hairpin 23 in the direction of increasing slot number by z / P-1 slot positions, one end of the fourth third U-shaped hairpin 23 is connected with the other end of the first fourth U-shaped hairpin 24, to form a first coil of winding, and the winding is performed to all stator slots 11 in the same way.

[0172] Thus, one winding of the U-phase second branch of the stator winding 20 is realized, the winding requirement on the stator core 10 can be realized, and each stator slot 11 is wound in six layers, which can improve the space utilization rate and ensure the efficiency and thermal stability of the motor. At the same time, x

[0173] In the second winding of the second branch, one end of the first first U-shaped hairpin 21 is arranged in the first slot layer, and the other end of the first first U-shaped hairpin 21 is arranged in the first slot layer in the direction of decreasing slot number by z / P+1 slot positions, and in the third winding of the second branch, one end of the second first U-shaped hairpin 21 is arranged in the first slot layer, and the other end of the second first U-shaped hairpin 21 is arranged in the first slot layer in the direction of decreasing slot number by z / P+1 slot positions, which can cause the first, second and third windings to be misaligned when connected, facilitating connection between each other, avoiding the connection of sub-coils through the connection part in the related art, reducing the connection structure of the sub-coil, making the process simple, and reducing manufacturing costs, reducing the occupied space of the stator assembly 100.

[0174] In addition, in the U-phase second branch of the stator winding 20, only four types of U-shaped hairpin wire types (i.e., the first U-shaped hairpin 21, the second U-shaped hairpin 22, the third U-shaped hairpin 23, and the fourth U-shaped hairpin 24) are used to realize the winding of the stator core 10, thereby realizing the few wire type structure design of the stator winding 20, facilitating the saving of wire type mold cost and production rhythm, making the manufacturing simple, and reducing the manufacturing cost.

[0175] The winding method of the U-phase third branch of the stator winding 20 is as follows:

[0176] From the fifth slot layer, one end of the first third U-shaped hairpin 23 is arranged in the fifth slot layer, and the other end of the first third U-shaped hairpin 23 is arranged in the fourth slot layer in the direction of decreasing slot number by x slot positions, one end of the second third U-shaped hairpin 23 is connected to the other end of the first third U-shaped hairpin 23, one end of the second third U-shaped hairpin 23 is arranged in the third slot layer, and the other end of the second third U-shaped hairpin 23 is arranged in the second slot layer in the direction of decreasing slot number by x slot positions, one end of the first second U-shaped hairpin 22 is connected to the other end of the second third U-shaped hairpin 23, one end of the first second U-shaped hairpin 22 is arranged in the first slot layer, and the other end of the first first U-shaped hairpin 21 is arranged in the first slot layer in the direction of decreasing slot number by z / P-(number of slots per pole per phase-1) slot positions,

[0177] Then, starting from the first slot layer, the third third U-shaped hairpin 23 and the fourth third U-shaped hairpin 23 are respectively rotated by z / P-1 slot positions in the direction of decreasing slot number from the second third U-shaped hairpin 23 and the first third U-shaped hairpin 23, wherein the other end of the first second U-shaped hairpin 22 is connected to one end of the third third U-shaped hairpin 23, the other end of the third third U-shaped hairpin 23 is connected to one end of the fourth third U-shaped hairpin 23, one end of the first fourth U-shaped hairpin 24 is connected to the other end of the fourth third U-shaped hairpin 23, and the other end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer by spanning z / P slot positions in the direction of increasing slot number, forming the first winding of the stator core 10. In the same way, the winding is wound to all stator slots 11.

[0178] Thus, one winding of the U-phase third branch of the stator winding 20 is realized, the winding requirement on the stator core 10 can be realized, and each stator slot 11 is wound in six layers, which can improve the space utilization and ensure the efficiency and thermal stability of the motor. At the same time, x < z / P, x > z / P or x = z / P, different choices of the span of the third U-shaped hairpin 23 can be realized, which provides greater freedom for the design of the stator winding 20 and can meet different use requirements, facilitating adjustment according to the specific performance requirements of the motor.

[0179] In the second winding of the third branch, one end of the first first U-shaped hairpin 21 is arranged in the first slot layer, and the other end of the first first U-shaped hairpin 21 is arranged in the first slot layer by spanning z / P+1 slot positions in the direction of decreasing slot number. In the third winding of the third branch, one end of the second first U-shaped hairpin 21 is arranged in the first slot layer, and the other end of the second first U-shaped hairpin 21 is arranged in the first slot layer by spanning z / P+1 slot positions in the direction of decreasing slot number. This can cause the first, second and third windings to be misaligned when connected, facilitating connection between them, avoiding the connection of sub-coils through the connection part in the related art, reducing the connection structure of the sub-coil, making the process simple, and reducing manufacturing costs and the occupied space of the stator assembly 100.

[0180] In addition, in the U-phase third branch of the stator winding 20, only four U-shaped hairpin wire types (i.e., the first U-shaped hairpin 21, the second U-shaped hairpin 22, the third U-shaped hairpin 23 and the fourth U-shaped hairpin 24) are used to realize the winding of the stator core 10, thereby realizing the few wire type structure design of the stator winding 20, facilitating the saving of wire type mold cost and production rhythm, making the manufacturing simple, and reducing the manufacturing cost.

[0181] Thus, the U-phase winding is divided into three branches for winding, ensuring uniform distribution of current in the stator slot 11, reducing the generation of unbalanced current, and improving the running stability and reliability of the motor.

[0182] Alternatively, the first branch of the U-phase stator winding 20 is wound as follows:

[0183] From the first slot layer, one end of the first third U-shaped hairpin 23 is arranged in the first slot layer, the other end of the first third U-shaped hairpin 23 is arranged in the first slot layer in the direction of decreasing slot number by x slots, one end of the first first U-shaped hairpin 21 is connected to the other end of the first third U-shaped hairpin 23, one end of the first first U-shaped hairpin 21 is arranged in the second slot layer, the other end of the first first U-shaped hairpin 21 is arranged in the third slot layer in the direction of increasing slot number by z / P+1 slots, one end of the second third U-shaped hairpin 23 is connected to the other end of the first first U-shaped hairpin 21, one end of the second third U-shaped hairpin 23 is arranged in the fourth slot layer, the other end of the second third U-shaped hairpin 23 is arranged in the fifth slot layer in the direction of increasing slot number by x slots, one end of the first fourth U-shaped hairpin 24 is connected to the other end of the second third U-shaped hairpin 23, one end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer in the direction of increasing slot number by z / P slots,

[0184] From the sixth slot layer again, the third third U-shaped hairpin 23 is obtained by rotating the second third U-shaped hairpin 23 in the direction of increasing slot number by z / P-1 slots, the other end of the first fourth U-shaped hairpin 24 is connected to one end of the third third U-shaped hairpin 23, one end of the fourth third U-shaped hairpin 23 is arranged in the third slot layer, the other end of the fourth third U-shaped hairpin 23 is arranged in the second slot layer in the direction of decreasing slot number by x slots, the other end of the third third U-shaped hairpin 23 is connected to one end of the fourth third U-shaped hairpin 23, forming a first winding, and winding to all stator slots 11 in the same way.

[0185] Thus, one winding of the first branch of the U-phase stator winding 20 is realized, the winding requirement on the stator core 10 can be realized, and each stator slot 11 is wound in six layers, which can improve the space utilization rate and ensure the efficiency and thermal stability of the motor. At the same time, x < z / P, x > z / P or x = z / P, different choices of the span of the third U-shaped hairpin 23 can be realized, which provides greater freedom for the design of the stator winding 20 and can meet different use requirements, and facilitates adjustment according to the specific performance requirements of the motor.

[0186] In the second winding of the first branch, one end of the second first U-shaped hairpin 21 is arranged in the second slot layer, and the other end of the second first U-shaped hairpin 21 is arranged in the third slot layer across z / P+1 slot positions in the direction of increasing slot number, and in the third winding of the first branch, one end of the first second U-shaped hairpin 22 is arranged in the second slot layer, and the other end of the first second U-shaped hairpin 22 is arranged in the third slot layer across z / P-(the number of slots per pole per phase-1) slot positions in the direction of increasing slot number, so that the first winding, the second winding and the third winding are staggered when connected, facilitating connection between each other, avoiding the connection of the sub-coil through the connection part in the related art, reducing the connection structure of the sub-coil, simplifying the process, reducing the manufacturing cost, and reducing the occupied space of the stator assembly 100.

[0187] In addition, in the U-phase first branch of the stator winding 20, only four U-shaped hairpin wire types (i.e., the first U-shaped hairpin 21, the second U-shaped hairpin 22, the third U-shaped hairpin 23, and the fourth U-shaped hairpin 24) are used to realize the winding of the stator core 10, thereby realizing the few wire type structure design of the stator winding 20, facilitating the saving of wire type mold cost and production rhythm, simplifying the manufacturing, and reducing the manufacturing cost.

[0188] The winding mode of the U-phase second branch of the stator winding 20 is as follows:

[0189] From the third slot layer, one end of the first third U-shaped hairpin 23 is arranged in the third slot layer, and the other end of the first third U-shaped hairpin 23 is arranged in the second slot layer across x slot positions in the direction of decreasing slot number, one end of the second third U-shaped hairpin 23 is connected with the other end of the first third U-shaped hairpin 23, one end of the second third U-shaped hairpin 23 is arranged in the first slot layer, and the other end of the second third U-shaped hairpin 23 is arranged in the first slot layer across x slot positions in the direction of decreasing slot number,

[0190] From the first slot layer again, one end of the first first U-shaped hairpin 21 is arranged in the second slot layer, the other end of the second third U-shaped hairpin 23 is connected with one end of the first first U-shaped hairpin 21, the other end of the first first U-shaped hairpin 21 is arranged in the third slot layer across z / P+1 slot positions in the direction of increasing slot number, one end of the third third U-shaped hairpin 23 is connected with the other end of the first first U-shaped hairpin 21, one end of the third third U-shaped hairpin 23 is arranged in the fourth slot layer, the other end of the third third U-shaped hairpin 23 is arranged in the fifth slot layer across x slot positions in the direction of increasing slot number, one end of the first fourth U-shaped hairpin 24 is connected with the other end of the third third U-shaped hairpin 23, one end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer, and the other end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer across z / P slot positions in the direction of increasing slot number,

[0191] From the sixth slot layer, a fourth third U-shaped hairpin 23 is obtained by rotating the third third U-shaped hairpin 23 in the direction of increasing slot number by z / P-1 slot positions, one end of the fourth third U-shaped hairpin 23 is connected to the other end of the first fourth U-shaped hairpin 24 to form the first winding of the stator core 10, and the winding is wound in the same way to all the stator slots 11.

[0192] Thus, one winding of the U-phase second branch of the stator winding 20 is realized, the winding requirement on the stator core 10 can be realized, and each stator slot 11 is wound in six layers, which can improve the space utilization and ensure the efficiency and thermal stability of the motor. At the same time, x < z / P, x > z / P or x = z / P, different choices of the span of the third U-shaped hairpin 23 can be realized, which provides greater freedom for the design of the stator winding 20 and can meet different use requirements, and facilitates adjustment according to the specific performance requirements of the motor.

[0193] In the second winding of the second branch, one end of the second first U-shaped hairpin 21 is provided in the second slot layer, the other end of the second first U-shaped hairpin 21 is provided in the third slot layer by spanning z / P+1 slot positions in the direction of increasing slot number, and in the third winding of the second branch, one end of the first second U-shaped hairpin 22 is provided in the second slot layer, the other end of the first second U-shaped hairpin 22 is provided in the third slot layer by spanning z / P-(number of slots per pole per phase-1) slot positions in the direction of increasing slot number, which can cause the first, second and third windings to be misaligned when connected, facilitating connection between each other, avoiding the connection of sub-coils through the connection part in the related art, reducing the connection structure of the sub-coil, making the process simple, and reducing the manufacturing cost and the occupied space of the stator assembly 100.

[0194] In addition, in the U-phase second branch of the stator winding 20, only four U-shaped hairpin wire types (i.e. the first U-shaped hairpin 21, the second U-shaped hairpin 22, the third U-shaped hairpin 23 and the fourth U-shaped hairpin 24) are used to realize the winding of the stator core 10, thereby realizing the few wire type structure design of the stator winding 20, facilitating the saving of wire type mold cost and production rhythm, making the manufacturing simple, and reducing the manufacturing cost.

[0195] The winding mode of the U-phase third branch of the stator winding 20 is as follows:

[0196] From the fifth slot layer, one end of the first third U-shaped hairpin 23 is arranged in the fifth slot layer, the other end of the first third U-shaped hairpin 23 is arranged in the fourth slot layer in the direction of decreasing slot number by spanning x slot positions, one end of the second third U-shaped hairpin 23 is connected with the other end of the first third U-shaped hairpin 23, one end of the second third U-shaped hairpin 23 is arranged in the third slot layer, the other end of the second third U-shaped hairpin 23 is arranged in the second slot layer in the direction of decreasing slot number by spanning x slot positions, one end of the third third U-shaped hairpin 23 is connected with the other end of the second third U-shaped hairpin 23, one end of the third third U-shaped hairpin 23 is arranged in the first slot layer, the other end of the third third U-shaped hairpin 23 is arranged in the first slot layer in the direction of decreasing slot number by spanning x slot positions,

[0197] From the first slot layer again, one end of the first first U-shaped hairpin 21 is arranged in the second slot layer, the other end of the third third U-shaped hairpin 23 is connected with one end of the first first U-shaped hairpin 21, the other end of the first first U-shaped hairpin 21 is arranged in the third slot layer in the direction of increasing slot number by spanning z / P+1 slot positions, the fourth third U-shaped hairpin 23 is obtained by rotating the first third U-shaped hairpin 23 in the direction of decreasing slot number by z / P-1 slot positions, the other end of the first first U-shaped hairpin 21 is connected with one end of the fourth third U-shaped hairpin 23, one end of the first fourth U-shaped hairpin 24 is connected with the other end of the fourth third U-shaped hairpin 23, one end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer in the direction of increasing slot number by spanning z / P slot positions, to form a first coil winding, and the winding is performed to all stator slots 11 in the same way.

[0198] Thus, one winding of the U-phase third branch of the stator winding 20 is realized, the winding requirement on the stator core 10 can be realized, and each stator slot 11 is wound in six layers, which can improve the space utilization rate and ensure the efficiency and thermal stability of the motor. At the same time, x < z / P, x > z / P or x = z / P, different choices of the span of the third U-shaped hairpin 23 can be realized, which provides greater freedom for the design of the stator winding 20 and can meet different use requirements, and facilitates adjustment according to the specific performance requirements of the motor.

[0199] In the second coil winding of the third branch, one end of the second first U-shaped hairpin 21 is arranged in the second slot layer, and the other end of the second first U-shaped hairpin 21 is arranged in the third slot layer across z / P+1 slot positions in the direction in which the slot number increases. In the third coil winding of the third branch, one end of the first second U-shaped hairpin 22 is arranged in the second slot layer, and the other end of the first second U-shaped hairpin 22 is arranged in the third slot layer across z / P-(the number of slots per pole per phase-1) slot positions in the direction in which the slot number increases. This can cause a misalignment when the first coil, the second coil, and the third coil are connected, facilitating the connection between them, avoiding the connection of sub-coils through the connection part in the related art, reducing the connection structure of the sub-coil, making the process simple, and reducing the manufacturing cost, thereby reducing the occupied space of the stator assembly 100.

[0200] In addition, in the U-phase third branch of the stator winding 20, only four U-shaped hairpin wire types (i.e., the first U-shaped hairpin 21, the second U-shaped hairpin 22, the third U-shaped hairpin 23, and the fourth U-shaped hairpin 24) are used to implement the winding of the stator core 10, thereby achieving a few wire type structure design of the stator winding 20, facilitating the saving of wire type mold cost and production rhythm, making the manufacturing simple, and reducing the manufacturing cost.

[0201] In this way, the U-phase winding is divided into three branches for winding, ensuring the uniform distribution of current in the stator slot 11, reducing the generation of unbalanced current, and improving the running stability and reliability of the motor.

[0202] The winding methods of the U-phase, the V-phase, and the W-phase are the same. The winding method of the V-phase winding is obtained by rotating the U-phase winding by 3 slot positions in the direction in which the slot number increases (for example, the clockwise direction shown in Figure 1 ), or in the direction in which the slot number decreases (for example, the counterclockwise direction shown in Figure 1 ), facilitating the control of the positive and negative pole switching of the U-phase and the V-phase. The winding method of the W-phase winding is obtained by rotating the U-phase winding by 6 slot positions in the direction in which the slot number increases or in the direction in which the slot number decreases, facilitating the control of the positive and negative pole invariability of the U-phase and the W-phase, achieving the winding requirement of the V-phase and the W-phase, and ensuring a compact structure.

[0203] In some embodiments, the first U-shaped hairpin 21, the second U-shaped hairpin 22, the third U-shaped hairpin 23, and the fourth U-shaped hairpin 24 are connected to each other by welding, which can meet the required connection requirement, ensure reliable connection, and reduce production cost.

[0204] For example, in some embodiments, the first slot layer is an A slot layer, the second slot layer is a B slot layer, the third slot layer is a C slot layer, the fourth slot layer is a D slot layer, the fifth slot layer is an E slot layer, and the sixth slot layer is an F slot layer.

[0205] When x=8, the U-phase first branch winding route of the stator winding 20 is as follows:

[0206] As shown in Figure 3

[0207] (U1+)-10A-3A-11B-21C-29D-39E-47F-2F-48E-38D-30C-20B-12A-2A-10B-20C-28D-38E-46F-1F-47E-37D-29C-19B-11A-1A-9B-19C-27D-37E-45F-54F-46E-36D-28C-18B-(U1-);

[0208] Alternatively, as shown in Figure 11

[0209] (U1+)-10A-1A-9B-20C-28D-38E-46F-1F-47E-37D-29C-19B-11A-2A-10B-21C-29D-39E-47F-2F-48E-38D-30C-20B-12A-3A-11B-19C-27D-37E-45F-54F-46E-36D-28C-18B-(U1-);

[0210] Further alternatively, as shown in Figure 12

[0211] (U1+)-10A-1A-9B-20C-28D-38E-46F-1F-47E-37D-29C-19B-11A-2A-10B-21C-29D-39E-47F-2F-48E-38D-30C-20B-12A-3A-11B-19C-27D-37E-45F-54F-46E-36D-28C-18B-(U1-);

[0212] The U-phase second branch winding route of the stator winding 20 is as follows:

[0213] As shown in Figure 3

[0214] (U2+)-10C-2B-46A-38A-48B-2C-12D-20E-30F-39F-29E-21D-11C-3B-47A-39A-49B-3C-13D-21E-31F-40F-30E-22D-12C-4B-48A-37A-47B-1C-11D-19E-29F-38F-28E-20D-(U2-);

[0215] Alternatively, as shown in Figure 11

[0216] ​​​​​(U2+)-10C-54B-46A-39A-47B-3C-11D-21E-29F-38F-30E-20D-12C-2B-48A-38A-46B-2C-10D-20E-28F-37F-29E-19D-11C-1B-47A-37A-45B-1C-9D-19E-27F-36F-28E-18D-(U2-);

[0217] Alternatively, as shown in FIG. 6B, the stator winding 20 can be configured as follows: Figure 12

[0218] (U2+)-10C-54B-46A-37A-45B-2C-10D-20E-28F-37F-29E-19D-11C-1B-47A-38A-46B-3C-11D-21E-29F-38F-30E-20D-12C-2B-48A-39A-47B-1C-9D-19E-27F-36F-28E-18D-(U2-);

[0219] The U-phase third branch winding route of the stator winding 20 is as follows:

[0220] Alternatively, as shown in FIG. 6B, the stator winding 20 can be configured as follows: Figure 3

[0221] (U3+)-10E-2D-46C-38B-28A-20A-30B-38C-48D-2E-12F-21F-11E-3D-47C-39B-29A-21A-31B-39C-49D-3E-13F-22F-12E-4D-48C-40B-30A-19A-29B-37C-47D-1E-11F-20F-(U3-);

[0222] Alternatively, as shown in FIG. 6B, the stator winding 20 can be configured as follows: Figure 11

[0223] (U3+)-10E-54D-46C-36B-28A-21A-29B-39C-47D-3E-11F-20F-12E-2D-48C-38B-30A-20A-28B-38C-46D-2E-10F-19F-11E-1D-47C-37B-29A-19A-27B-37C-45D-1E-9F-18F-(U3-);

[0224] Alternatively, as shown in FIG. 6B, the stator winding 20 can be configured as follows: Figure 12

[0225] ​​​​(U3+)-10E-54D-46C-36B-28A-19A-27B-38C-46D-2E-10F-19F-11E-1D-47C-37B-29A-20A-28B-39C-47D-3E-11F-20F-12E-2D-48C-38B-30A-21A-29B-37C-45D-1E-9F-18F-(U3-);

[0226] As shown in FIG. 4A, the first branch of the V-phase of the stator winding 20 is wired as follows: Figure 4

[0227] (V1+)-13A-5A-15B-23C-33D-41E-51F-6F-50E-42D-32C-24B-14A-6A-16B-24C-34D-42E-52F-7F-51E-43D-33C-25B-15A-4A-14B-22C-32D-40E-50F-5F-49E-41D-31C-23B-(V1-);

[0228] As shown in FIG. 4B, the second branch of the V-phase of the stator winding 20 is wired as follows: Figure 4

[0229] (V2+)-13C-5B-49A-41A-51B-5C-15D-23E-33F-42F-32E-24D-14C-6B-50A-42A-52B-6C-16D-24E-34F-43F-33E-25D-15C-7B-51A-40A-50B-4C-14D-22E-32F-41F-31E-23D-(V2-);

[0230] As shown in FIG. 4C, the third branch of the V-phase of the stator winding 20 is wired as follows: Figure 4

[0231] (V3+)-13E-5D-49C-41B-31A-23A-33B-41C-51D-5E-15F-24F-14E-5D-50C-42B-32A-24A-34B-42C-52D-6E-16F-25F-15E-7D-51C-43B-33A-22A-32B-40C-50D-4E-14F-23F-(V3-);

[0232] As shown in FIG. 4D, the first branch of the W-phase of the stator winding 20 is wired as follows: Figure 5

[0233] ​​​​(W1+)-16A-8A-18B-26C-36D-44E-54F-9F-53E-45D-35C-27B-17A-9A-19B-27C-37D-45E-1F-10F-54E-46D-36C-28B-18A-7A-17B-25C-35D-43E-53F-8F-52E-44D-34C-26B-(W1-);

[0234] As shown in FIG. 6, the winding route of the first branch of the U-phase of the stator winding 20 is as follows: Figure 5

[0235] (W2+)-16C-8B-52A-44A-54B-8C-18D-26E-36F-45F-35E-27D-17C-9B-53A-45A-1B-9C-19D-27E-37F-46F-36E-28D-18C-10B-54A-43A-53B-7C-17D-25E-35F-44F-34E-26D-(W2-);

[0236] As shown in FIG. 7, the winding route of the second branch of the U-phase of the stator winding 20 is as follows: Figure 5

[0237] (W3+)-16E-8D-52C-44B-34A-26A-36B-44C-54D-8E-18F-27F-17E-9D-53C-45B-35A-27A-37B-45C-1D-9E-19F-28F-18E-10D-54C-46B-36A-25A-35B-43C-53D-7E-17F-26F-(W3-). Thus, different winding requirements of the stator winding 20 can be met, and harmonics can be reduced.

[0238] As shown in FIG. 8, the winding route of the first branch of the U-phase of the stator winding 20 at x = 10 is as follows: Figure 6

[0239] (U1+)-10A-2A-10B-20C-28D-38E-46F-1F-47E-37D-29C-19B-11A-3A-11B-21C-29D-39E-47F-2F-48E-38D-30C-20B-12A-1A-9B-19C-27D-37E-45F-54F-46E-36D-28C-18B-(U1-);

[0240] As shown in FIG. 9, the winding route of the second branch of the U-phase of the stator winding 20 is as follows: Figure 6

[0241] ​​​​(U2+)-10C-54B-46A-38A-46B-2C-10D-20E-28F-37F-29E-19D-11C-1B-47A-39A-47B-3C-11D-21E-29F-38F-30E-20D-12C-2B-48A-37A-45B-1C-9D-19E-27F-36F-28E-18D-(U2-);

[0242] As shown in FIG. 1, the winding route of the U-phase first branch of the stator winding 20 is as follows: Figure 6

[0243] (U3+)-10E-54D-46C-36B-28A-20A-28B-38C-46D-2E-10F-19F-11E-1D-47C-37B-29A-21A-29B-39C-47D-3E-11F-20F-12E-2D-48C-38B-30A-19A-27B-37C-45D-1E-9F-18F-(U3-) Thus, different winding requirements of the stator winding 20 can be met, and harmonics can be reduced.

[0244] As shown in FIG. 1, the winding route of the U-phase first branch of the stator winding 20 is as follows: Figure 7

[0245] (U1+)-10A-2A-11B-20C-29D-38E-47F-2F-47E-38D-29C-20B-11A-3A-12B-21C-30D-39E-48F-3F-48E-39D-30C-21B-12A-1A-10B-19C-28D-37E-46F-1F-46E-37D-28C-19B-(U1-) Thus, different winding requirements of the stator winding 20 can be met, and harmonics can be reduced.

[0246] As shown in FIG. 1, the winding route of the U-phase first branch of the stator winding 20 is as follows: Figure 7

[0247] (U2+)-10C-1B-46A-38A-47B-2C-11D-20E-29F-38F-29E-20D-11C-2B-47A-39A-48B-3C-12D-21E-30F-39F-30E-21D-12C-3B-48A-37A-46B-1C-10D-19E-28F-37F-28E-19D-(U2-) Thus, different winding requirements of the stator winding 20 can be met, and harmonics can be reduced.

[0248] As shown in FIG. 1, the winding route of the U-phase first branch of the stator winding 20 is as follows: Figure 7

[0249] ​​​​(U3+)-10E-1D-46C-37B-28A-20A-29B-38C-47D-2E-11F-20F-11E-2D-47C-38B-29A-21A-30B-39C-48D-3E-12F-21F-12E-3D-48C-39B-30A-19A-28B-37C-46D-1E-10F-19F-(U3-). Thus, different winding requirements of the stator winding 20 can be met, and the problem of high-voltage breakdown can be avoided, which is suitable for high-voltage motor slot and phase design, and ensures use safety.

[0250] In some embodiments, after the stator winding 20 is wound on the stator core 10, the stator winding 20 is fixed by impregnating paint, so that the stator winding 20 is reliably fixed on the stator core 10 and has good insulation effect, effectively protects the stator assembly 100 from external factors, ensures use safety, and facilitates extension of service life.

[0251] In some embodiments of the utility model, as shown in Figure 8 z=54, m=3, P=6, each slot in the 54 stator slots 11 has 7 slot layers, and the first slot layer, the second slot layer, the third slot layer, the fourth slot layer, the fifth slot layer, the sixth slot layer and the seventh slot layer are sequentially arranged along the radial direction of the stator core 10, and the three phases include U phase, V phase and W phase.

[0252] The U phase first branch winding mode of the stator winding 20 is as follows:

[0253] From the first slot layer, one end of the first first U-shaped hairpin 21 is arranged in the first slot layer, the other end of the first first U-shaped hairpin 21 is arranged in the first slot layer in the direction of decreasing slot number, one end of the first third U-shaped hairpin 23 is connected with the other end of the first first U-shaped hairpin 21, one end of the first third U-shaped hairpin 23 is arranged in the second slot layer, the other end of the first third U-shaped hairpin 23 is arranged in the third slot layer in the direction of increasing slot number by x slot positions, one end of the second third U-shaped hairpin 23 is connected with the other end of the first third U-shaped hairpin 23, one end of the second third U-shaped hairpin 23 is arranged in the fourth slot layer, the other end of the second third U-shaped hairpin 23 is arranged in the fifth slot layer in the direction of increasing slot number by x slot positions, one end of the third third U-shaped hairpin 23 is connected with the other end of the second third U-shaped hairpin 23, one end of the third third U-shaped hairpin 23 is arranged in the sixth slot layer, the other end of the third third U-shaped hairpin 23 is arranged in the seventh slot layer in the direction of increasing slot number by x slot positions,

[0254] From the seventh slot layer, the fourth third U-shaped hairpin 23, the fifth third U-shaped hairpin 23 and the sixth third U-shaped hairpin 23 are respectively rotated z / P-1 slot positions in the direction of increasing slot number from the third third U-shaped hairpin 23, the second third U-shaped hairpin 23 and the first third U-shaped hairpin 23, wherein the other end of the third third U-shaped hairpin 23 is connected with one end of the fourth third U-shaped hairpin 23, the other end of the fourth third U-shaped hairpin 23 is connected with one end of the fifth third U-shaped hairpin 23, and the other end of the fifth third U-shaped hairpin 23 is connected with one end of the sixth third U-shaped hairpin 23, forming the first winding of the wire, and winding to all stator slots 11 in the same way.

[0255] Thus, one winding of the U-phase first branch of the stator winding 20 is realized, the winding requirement on the stator core 10 can be realized, each stator slot 11 is wound in seven layers, the space utilization can be improved, the alternating current loss can be reduced, and the efficiency and thermal stability of the motor can be ensured. At the same time, x < z / P, x > z / P or x = z / P, different choices of the span of the third U-shaped hairpin 23 can be realized, greater freedom is provided for the design of the stator winding 20, different use requirements can be met, and adjustment can be facilitated according to the specific performance requirements of the motor.

[0256] In the second winding of the first branch, one end of the second first U-shaped hairpin 21 is arranged in the first slot layer, and the other end of the second first U-shaped hairpin 21 is arranged in the first slot layer by spanning z / P-1 slot positions in the direction of decreasing slot number. In the third winding of the first branch, one end of the first second U-shaped hairpin 22 is arranged in the first slot layer, and the other end of the first second U-shaped hairpin 22 is arranged in the first slot layer by spanning z / P+(number of slots per pole per phase-1) slot positions in the direction of decreasing slot number. The first, second and third windings can be connected to produce a displacement, which facilitates connection between each other, avoids connection of sub-coils by a connection part in the related art, reduces the connection structure of the sub-coil, simplifies the process, reduces the manufacturing cost, and reduces the occupied space of the stator assembly 100.

[0257] In addition, in the U-phase first branch of the stator winding 20, only three U-shaped hairpin wire types (i.e., the first U-shaped hairpin 21, the second U-shaped hairpin 22 and the third U-shaped hairpin 23) are used to realize the winding of the stator core 10, so that a few wire type structure design of the stator winding 20 can be realized, the wire type mold cost and production rhythm can be saved, the manufacturing is simple, and the manufacturing cost can be reduced.

[0258] The winding mode of the U-phase second branch of the stator winding 20 is as follows:

[0259] From the third slot layer, one end of the first third U-shaped hairpin 23 is arranged in the third slot layer, the other end of the first third U-shaped hairpin 23 is arranged in the second slot layer in the direction of decreasing slot number by crossing x slot positions, one end of the first first U-shaped hairpin 21 is connected with the other end of the first third U-shaped hairpin 23, one end of the first first U-shaped hairpin 21 is arranged in the first slot layer, the other end of the first first U-shaped hairpin 21 is arranged in the first slot layer in the direction of decreasing slot number by crossing z / P-1 slot positions,

[0260] From the first slot layer again, the second third U-shaped hairpin 23 is obtained by rotating the first third U-shaped hairpin 23 in the direction of decreasing slot number by z / P-1 slot positions, one end of the second third U-shaped hairpin 23 is connected with the other end of the first first U-shaped hairpin 21, one end of the third third U-shaped hairpin 23 is connected with the other end of the second third U-shaped hairpin 23, one end of the third third U-shaped hairpin 23 is arranged in the fourth slot layer, the other end of the third third U-shaped hairpin 23 is arranged in the fifth slot layer in the direction of increasing slot number by crossing x slot positions, one end of the fourth third U-shaped hairpin 23 is connected with the other end of the third third U-shaped hairpin 23, one end of the fourth third U-shaped hairpin 23 is arranged in the sixth slot layer, the other end of the fourth third U-shaped hairpin 23 is arranged in the seventh slot layer in the direction of increasing slot number by crossing x slot positions,

[0261] From the seventh slot layer again, the fifth third U-shaped hairpin 23 and the sixth third U-shaped hairpin 23 are obtained by rotating the fourth third U-shaped hairpin 23 and the third third U-shaped hairpin 23 in the direction of increasing slot number by z / P-1 slot positions respectively, one end of the fifth third U-shaped hairpin 23 is connected with the other end of the first fourth U-shaped hairpin 24, the other end of the fifth third U-shaped hairpin 23 is connected with one end of the sixth third U-shaped hairpin 23, forming a first coil of winding, and winding to all stator slots 11 in the same way.

[0262] Thus, one winding of the U-phase second branch of the stator winding 20 is realized, the winding requirement on the stator core 10 can be realized, and each stator slot 11 is wound in seven layers, which can improve the space utilization rate, reduce the alternating current loss, ensure the efficiency and thermal stability of the motor. At the same time, x < z / P, x > z / P or x = z / P, different choices of the span of the third U-shaped hairpin 23 can be realized, which provides greater freedom for the design of the stator winding 20 and can meet different use requirements, and facilitates adjustment according to the specific performance requirements of the motor.

[0263] In the second winding of the second branch, one end of the second first U-shaped hairpin 21 is arranged in the first slot layer, and the other end of the second first U-shaped hairpin 21 is arranged in the first slot layer in the direction of decreasing slot number by spanning z / P-1 slot positions, in the third winding of the second branch, one end of the first second U-shaped hairpin 22 is arranged in the first slot layer, and the other end of the first second U-shaped hairpin 22 is arranged in the first slot layer in the direction of decreasing slot number by spanning z / P+(the number of slots per pole per phase-1) slot positions, which can cause misalignment when the first, second and third circles are connected, facilitating connection between each other, avoiding the connection of sub-coils through the connection part in the related art, reducing the connection structure of the sub-coil, making the process simple, and reducing manufacturing cost, reducing the occupied space of the stator assembly 100.

[0264] In addition, in the U-phase second branch of the stator winding 20, only three types of U-shaped hairpin wire types (i.e., the first U-shaped hairpin 21, the second U-shaped hairpin 22, and the third U-shaped hairpin 23) are used to realize the winding of the stator core 10, thereby realizing the few wire type structure design of the stator winding 20, facilitating the saving of wire type mold cost and production rhythm, making the manufacturing simple, and reducing the manufacturing cost.

[0265] The winding mode of the U-phase third branch of the stator winding 20 is as follows:

[0266] From the fifth slot layer, one end of the first third U-shaped hairpin 23 is arranged in the fifth slot layer, and the other end of the first third U-shaped hairpin 23 is arranged in the fourth slot layer in the direction of decreasing slot number by spanning x slot positions, one end of the second third U-shaped hairpin 23 is connected to the other end of the first third U-shaped hairpin 23, one end of the second third U-shaped hairpin 23 is arranged in the third slot layer, and the other end of the second third U-shaped hairpin 23 is arranged in the second slot layer in the direction of decreasing slot number by spanning x slot positions, one end of the first first U-shaped hairpin 21 is connected to the other end of the second third U-shaped hairpin 23, one end of the first first U-shaped hairpin 21 is arranged in the first slot layer, and the other end of the first first U-shaped hairpin 21 is arranged in the first slot layer in the direction of decreasing slot number by spanning z / P-1 slot positions,

[0267] From the first slot layer, a third third U-shaped hairpin 23 and a fourth third U-shaped hairpin 23 are obtained by rotating the second third U-shaped hairpin 23 and the first third U-shaped hairpin 23 by z / P-1 slot positions in the direction of decreasing slot number, respectively, wherein the other end of the first first U-shaped hairpin 21 is connected to one end of the third third U-shaped hairpin 23, the other end of the third third U-shaped hairpin 23 is connected to one end of the fourth third U-shaped hairpin 23, one end of the fifth third U-shaped hairpin 23 is connected to the other end of the fourth third U-shaped hairpin 23, one end of the fifth third U-shaped hairpin 23 is arranged in the sixth slot layer, and the other end of the fifth third U-shaped hairpin 23 is arranged in the seventh slot layer by spanning z / P-1 slot positions in the direction of increasing slot number,

[0268] From the seventh slot layer, a sixth third U-shaped hairpin 23 is obtained by rotating the fifth third U-shaped hairpin 23 by z / P-1 slot positions in the direction of increasing slot number, one end of the sixth third U-shaped hairpin 23 is connected to the other end of the first fourth U-shaped hairpin 24, forming a first turn of winding, and winding to all stator slots 11 in the same way.

[0269] Thus, one turn of winding of the U-phase third branch of the stator winding 20 is realized, the winding requirement on the stator core 10 can be realized, each stator slot 11 is wound in seven layers, the space utilization rate can be improved, the alternating current loss can be reduced, and the efficiency and thermal stability of the motor can be ensured. At the same time, x < z / P, x > z / P or x = z / P, different choices of the span of the third U-shaped hairpin 23 can be realized, greater freedom is provided for the design of the stator winding 20, different use requirements can be met, and adjustment can be facilitated according to the specific performance requirements of the motor.

[0270] In the second turn of winding of the third branch, one end of the second first U-shaped hairpin 21 is arranged in the first slot layer, and the other end of the second first U-shaped hairpin 21 is arranged in the first slot layer by spanning z / P-1 slot positions in the direction of decreasing slot number. In the third turn of winding of the third branch, one end of the first second U-shaped hairpin 22 is arranged in the first slot layer, and the other end of the first second U-shaped hairpin 22 is arranged in the first slot layer by spanning z / P+(number of slots per pole per phase-1) slot positions in the direction of decreasing slot number. The first turn, the second turn and the third turn can be connected to produce a displacement, which facilitates connection between each other, avoids connection of sub-coils by a connection part in the related art, reduces the connection structure of the sub-coil, simplifies the process, reduces the manufacturing cost, and reduces the occupied space of the stator assembly 100.

[0271] In addition, in the U-phase third branch of the stator winding 20, only three U-shaped hairpin wire types (i.e., the first U-shaped hairpin 21, the second U-shaped hairpin 22, and the third U-shaped hairpin 23) are used to realize the winding of the stator core 10, so that a few wire type structure design of the stator winding 20 can be realized, the wire type mold cost and production rhythm are facilitated to be saved, the manufacturing is simple, and the manufacturing cost can be reduced.

[0272] Therefore, the U-phase winding is divided into three branches for winding, which ensures the uniform distribution of current in the stator slot 11, reduces the generation of unbalanced current, and improves the operation stability and reliability of the motor.

[0273] The winding methods of the U-phase, the V-phase, and the W-phase are the same, the winding method of the V-phase winding is to rotate the U-phase winding by 3 slot positions in the direction of increasing slot number or in the direction of decreasing slot number, so as to facilitate the control of the positive and negative poles of the U-phase and the V-phase, the winding method of the W-phase winding is to rotate the U-phase winding by 6 slot positions in the direction of increasing slot number or in the direction of decreasing slot number, so as to facilitate the control of the positive and negative poles of the U-phase and the W-phase, the winding requirements of the V-phase and the W-phase can be realized, and the compact structure is ensured.

[0274] For example, in some embodiments, the first slot layer is an A slot layer, the second slot layer is a B slot layer, the third slot layer is a C slot layer, the fourth slot layer is a D slot layer, the fifth slot layer is an E slot layer, the sixth slot layer is an F slot layer, and the seventh slot layer is a G slot layer.

[0275] As shown in FIG. 10, the winding route of the U-phase first branch of the stator winding 20 is as follows when x = 10: Figure 8

[0276] (U1+)-10A-2A-10B-20C-28D-38E-46F-2G-11G-1F-47E-37D-29C-19B-11A-3A-11B-21C-29D-39E-47F-3G-12G-2F-48E-38D-30C-20B-12A-1A-9B-19C-27D-37E-45F-1G-10G-54F-46E-36D-28C-18B-(U1-);

[0277] As shown in FIG. 11, the winding route of the U-phase second branch of the stator winding 20 is as follows: Figure 8

[0278] ​​(U2+)-10C-54B-46A-38A-46B-2C-10D-20E-28F-38G-47G-37F-29E-19D-11C-1B-47A-39A-47B-3C-11D-21E-29F-39G-48G-38F-30E-20D-12C-2B-48A-37A-45B-1C-9D-19E-27F-37G-46G-36F-28E-18D-(U2-);

[0279] As shown in Figure 8 , the U-phase third branch winding route of the stator winding 20 is as follows:

[0280] (U3+)-10E-54D-46C-36B-28A-20A-28B-38C-46D-2E-10F-20G-29G-19F-11E-1D-47C-37B-29A-21A-29B-39C-47D-3E-11F-21G-30G-20F-12E-2D-48C-38B-30A-19A-27B-37C-45D-1E-9F-19G-28G-18F-(U3-). Thus, different winding requirements of the stator winding 20 can be met, and alternating current loss can be reduced, which is beneficial to improve the efficiency of the motor.

[0281] According to some embodiments of the present application, as shown in Figure 9 , z=54, m=3, P=6, each slot in the 54 stator slots 11 has 8 slot layers, which are first slot layer, second slot layer, third slot layer, fourth slot layer, fifth slot layer, sixth slot layer, seventh slot layer and eighth slot layer in turn along the radial direction of the stator core 10, and the 3 phases include U phase, V phase and W phase.

[0282] The U-phase first branch winding mode of the stator winding 20 is as follows:

[0283] From the first slot layer, one end of the first first U-shaped hairpin 21 is arranged in the first slot layer, the other end of the first first U-shaped hairpin 21 is arranged in the first slot layer in the direction of decreasing slot number by crossing z / P-1 slot positions, one end of the first third U-shaped hairpin 23 is connected with the other end of the first first U-shaped hairpin 21, one end of the first third U-shaped hairpin 23 is arranged in the second slot layer, the other end of the first third U-shaped hairpin 23 is arranged in the third slot layer in the direction of increasing slot number by crossing x slot positions, one end of the second third U-shaped hairpin 23 is connected with the other end of the first third U-shaped hairpin 23, one end of the second third U-shaped hairpin 23 is arranged in the fourth slot layer, the other end of the second third U-shaped hairpin 23 is arranged in the fifth slot layer in the direction of increasing slot number by crossing x slot positions, one end of the third third U-shaped hairpin 23 is connected with the other end of the second third U-shaped hairpin 23, one end of the third third U-shaped hairpin 23 is arranged in the sixth slot layer, the other end of the third third U-shaped hairpin 23 is arranged in the seventh slot layer in the direction of increasing slot number by crossing x slot positions, one end of the first fourth U-shaped hairpin 24 is connected with the other end of the third third U-shaped hairpin 23, one end of the first fourth U-shaped hairpin 24 is arranged in the eighth slot layer, the other end of the first fourth U-shaped hairpin 24 is arranged in the eighth slot layer in the direction of increasing slot number by crossing z / P slot positions,

[0284] From the eighth slot layer again, the fourth third U-shaped hairpin 23, the fifth third U-shaped hairpin 23 and the sixth third U-shaped hairpin 23 are respectively rotated z / P-1 slot positions in the direction of increasing slot number from the third third U-shaped hairpin 23, the second third U-shaped hairpin 23 and the first third U-shaped hairpin 23, wherein the other end of the third third U-shaped hairpin 23 is connected with one end of the fourth third U-shaped hairpin 23, the other end of the fourth third U-shaped hairpin 23 is connected with one end of the fifth third U-shaped hairpin 23, the other end of the fifth third U-shaped hairpin 23 is connected with one end of the sixth third U-shaped hairpin 23, forming a first coil of winding, and winding to all stator slots 11 in the same way.

[0285] Thus, one winding of the U-phase first branch of the stator winding 20 is realized, the winding requirement on the stator core 10 can be realized, and each stator slot 11 is wound in eight layers, which can improve the space utilization rate, reduce the alternating current loss, ensure the efficiency and thermal stability of the motor. At the same time, x < z / P, x > z / P or x = z / P, different choices of the span of the third U-shaped hairpin 23 can be realized, which provides greater freedom for the design of the stator winding 20 and can meet different use requirements, facilitating adjustment according to the specific performance requirements of the motor.

[0286] In the second winding of the first branch, one end of the second first U-shaped hairpin 21 is arranged in the first slot layer, and the other end of the second first U-shaped hairpin 21 is arranged in the first slot layer in the direction of decreasing slot number by spanning z / P-1 slot positions, in the third winding of the first branch, one end of the first second U-shaped hairpin 22 is arranged in the first slot layer, and the other end of the first second U-shaped hairpin 22 is arranged in the first slot layer in the direction of decreasing slot number by spanning z / P+(the number of slots per pole per phase-1) slot positions, which can cause misalignment when the first, second and third circles are connected, facilitating connection between each other, avoiding the connection of sub-coils through the connection part in the related art, reducing the connection structure of the sub-coil, making the process simple, and reducing manufacturing cost, reducing the occupied space of the stator assembly 100.

[0287] In addition, in the U-phase first branch of the stator winding 20, only four types of U-shaped hairpin wire types (i.e., the first U-shaped hairpin 21, the second U-shaped hairpin 22, the third U-shaped hairpin 23, and the fourth U-shaped hairpin 24) are used to realize the winding of the stator core 10, thereby realizing the few wire type structure design of the stator winding 20, facilitating the saving of wire type mold cost and production rhythm, making the manufacturing simple, and reducing the manufacturing cost. At the same time, the outgoing line structure 50 of the U-phase first branch can be arranged between the first slot layer and the second slot layer, or between the seventh slot layer and the eighth slot layer, making the structure arrangement more flexible, and being able to meet different setting requirements.

[0288] The winding mode of the U-phase second branch of the stator winding 20 is as follows:

[0289] From the third slot layer, one end of the first third U-shaped hairpin 23 is arranged in the third slot layer, the other end of the first third U-shaped hairpin 23 is arranged in the second slot layer in the direction of decreasing slot number by spanning x slot positions, one end of the first first U-shaped hairpin 21 is connected to the other end of the first third U-shaped hairpin 23, one end of the first first U-shaped hairpin 21 is arranged in the first slot layer, and the other end of the first first U-shaped hairpin 21 is arranged in the first slot layer in the direction of decreasing slot number by spanning z / P-1 slot positions,

[0290] From the first slot layer, a second third U-shaped hairpin 23 is obtained by rotating the first third U-shaped hairpin 23 by z / P-1 slot positions in the direction of decreasing slot number, one end of the second third U-shaped hairpin 23 is connected to the other end of the first first U-shaped hairpin 21, one end of a third third U-shaped hairpin 23 is connected to the other end of the second third U-shaped hairpin 23, one end of the third third U-shaped hairpin 23 is arranged in the fourth slot layer, the other end of the third third U-shaped hairpin 23 is arranged in the fifth slot layer by crossing x slot positions in the direction of increasing slot number, one end of a fourth third U-shaped hairpin 23 is connected to the other end of the third third U-shaped hairpin 23, one end of the fourth third U-shaped hairpin 23 is arranged in the sixth slot layer, the other end of the fourth third U-shaped hairpin 23 is arranged in the seventh slot layer by crossing x slot positions in the direction of increasing slot number, one end of a first fourth U-shaped hairpin 24 is connected to the other end of the fourth third U-shaped hairpin 23, one end of the first fourth U-shaped hairpin 24 is arranged in the eighth slot layer, the other end of the first fourth U-shaped hairpin 24 is arranged in the eighth slot layer by crossing z / P slot positions in the direction of increasing slot number,

[0291] From the eighth slot layer, a fifth third U-shaped hairpin 23 and a sixth third U-shaped hairpin 23 are obtained by rotating the fourth third U-shaped hairpin 23 and the third third U-shaped hairpin 23 by z / P-1 slot positions in the direction of increasing slot number, respectively, one end of the fifth third U-shaped hairpin 23 is connected to the other end of the first fourth U-shaped hairpin 24, the other end of the fifth third U-shaped hairpin 23 is connected to one end of the sixth third U-shaped hairpin 23, forming a first turn of winding, and winding to all stator slots 11 in the same way.

[0292] Thus, one turn of winding of the U-phase second branch of the stator winding 20 is realized, the winding requirement on the stator core 10 can be realized, and each stator slot 11 is wound in eight layers, which can improve the space utilization rate, reduce the alternating current loss, ensure the efficiency and thermal stability of the motor. At the same time, x < z / P, x > z / P or x = z / P, different choices of the span of the third U-shaped hairpin 23 can be realized, which provides greater freedom for the design of the stator winding 20 and can meet different use requirements, and facilitates adjustment according to the specific performance requirements of the motor.

[0293] In the second winding of the second branch, one end of the second first U-shaped hairpin 21 is arranged in the first slot layer, and the other end of the second first U-shaped hairpin 21 is arranged in the first slot layer in the direction of decreasing slot number by spanning z / P-1 slot positions, in the third winding of the second branch, one end of the first second U-shaped hairpin 22 is arranged in the first slot layer, and the other end of the first second U-shaped hairpin 22 is arranged in the first slot layer in the direction of decreasing slot number by spanning z / P+(the number of slots per pole per phase-1) slot positions, which can cause misalignment when the first, second and third windings are connected, facilitating connection between each other, avoiding the connection of sub-coils through the connection part in the related art, reducing the connection structure of the sub-coil, making the process simple, and reducing manufacturing cost, reducing the occupied space of the stator assembly 100.

[0294] In addition, in the U-phase second branch of the stator winding 20, only four types of U-shaped hairpin wire types (i.e., the first U-shaped hairpin 21, the second U-shaped hairpin 22, the third U-shaped hairpin 23, and the fourth U-shaped hairpin 24) are used to realize the winding of the stator core 10, thereby realizing the few wire type structure design of the stator winding 20, facilitating the saving of wire type mold cost and production rhythm, making the manufacturing simple, and reducing the manufacturing cost.

[0295] The winding mode of the U-phase third branch of the stator winding 20 is as follows:

[0296] From the fifth slot layer, one end of the first third U-shaped hairpin 23 is arranged in the fifth slot layer, and the other end of the first third U-shaped hairpin 23 is arranged in the fourth slot layer in the direction of decreasing slot number by spanning x slot positions, one end of the second third U-shaped hairpin 23 is connected to the other end of the first third U-shaped hairpin 23, one end of the second third U-shaped hairpin 23 is arranged in the third slot layer, and the other end of the second third U-shaped hairpin 23 is arranged in the second slot layer in the direction of decreasing slot number by spanning x slot positions, one end of the first first U-shaped hairpin 21 is connected to the other end of the second third U-shaped hairpin 23, one end of the first first U-shaped hairpin 21 is arranged in the first slot layer, and the other end of the first first U-shaped hairpin 21 is arranged in the first slot layer in the direction of decreasing slot number by spanning z / P-1 slot positions,

[0297] From the first slot layer, a third third U-shaped hairpin 23 and a fourth third U-shaped hairpin 23 are obtained by rotating the second third U-shaped hairpin 23 and the first third U-shaped hairpin 23 by z / P-1 slot positions in the direction of decreasing slot number, respectively, wherein the other end of the first first U-shaped hairpin 21 is connected to one end of the third third U-shaped hairpin 23, the other end of the third third U-shaped hairpin 23 is connected to one end of the fourth third U-shaped hairpin 23, one end of the fifth third U-shaped hairpin 23 is connected to the other end of the fourth third U-shaped hairpin 23, one end of the fifth third U-shaped hairpin 23 is arranged in the sixth slot layer, the other end of the fifth third U-shaped hairpin 23 is arranged in the seventh slot layer by crossing z / P-1 slot positions in the direction of increasing slot number, one end of the first fourth U-shaped hairpin 24 is arranged in the eighth slot layer, and the other end of the first fourth U-shaped hairpin 24 is arranged in the eighth slot layer by crossing z / P slot positions in the direction of increasing slot number,

[0298] From the eighth slot layer, a sixth third U-shaped hairpin 23 is obtained by rotating the fifth third U-shaped hairpin 23 by z / P-1 slot positions in the direction of increasing slot number, one end of the sixth third U-shaped hairpin 23 is connected to the other end of the first fourth U-shaped hairpin 24 to form a first turn of winding, and the winding is performed in the same manner to all stator slots 11.

[0299] Thus, one turn of winding of the U-phase third branch of the stator winding 20 is realized, the winding requirement on the stator core 10 can be realized, each stator slot 11 is wound in eight layers, the space utilization rate can be improved, the alternating current loss can be reduced, and the efficiency and thermal stability of the motor can be ensured. At the same time, x < z / P, x > z / P or x = z / P, different choices of the span of the third U-shaped hairpin 23 can be realized, greater freedom is provided for the design of the stator winding 20, different use requirements can be met, and adjustment can be facilitated according to the specific performance requirements of the motor.

[0300] In the second turn of winding of the third branch, one end of the second first U-shaped hairpin 21 is arranged in the first slot layer, and the other end of the second first U-shaped hairpin 21 is arranged in the first slot layer by crossing z / P-1 slot positions in the direction of decreasing slot number, in the third turn of winding of the third branch, one end of the first second U-shaped hairpin 22 is arranged in the first slot layer, and the other end of the first second U-shaped hairpin 22 is arranged in the first slot layer by crossing z / P+(number of slots per pole per phase-1) slot positions in the direction of decreasing slot number, so that the first turn, the second turn and the third turn are misaligned when connected, facilitating the connection between them, avoiding the connection of sub-coils by the connection part in the related art, reducing the connection structure of the sub-coil, making the process simple, reducing the manufacturing cost, and reducing the occupied space of the stator assembly 100.

[0301] Furthermore, in the third branch of the U phase of the stator winding 20, only four types of U-shaped hairpin wires (i.e., the first U-shaped hairpin 21, the second U-shaped hairpin 22, the third U-shaped hairpin 23 and the fourth U-shaped hairpin 24) are used to achieve the winding of the stator core 10, thereby enabling the stator winding 20 to have a fewer wire type structure design, which is convenient for saving wire type mold costs and production cycle, making manufacturing simple and reducing manufacturing costs.

[0302] Therefore, the U-phase winding is wound in three branches, which ensures the uniform distribution of current in the stator slot 11, reduces the generation of unbalanced current, and improves the smoothness and reliability of motor operation.

[0303] The winding methods for phases U, V, and W are the same. The winding method for phase V is obtained by rotating phase U by three slots in either the direction of increasing or decreasing slot number. This facilitates the control of swapping the positive and negative poles of phases U and V. The winding method for phase W is obtained by rotating phase U by six slots in either the direction of increasing or decreasing slot number. This facilitates the control of keeping the positive and negative poles of phases U and W unchanged. This method can meet the winding requirements of phases V and W and ensures a compact structure.

[0304] For example, in some embodiments, such as Figure 9 As shown, the first slot layer is slot A, the second slot layer is slot B, the third slot layer is slot C, the fourth slot layer is slot D, the fifth slot layer is slot E, the sixth slot layer is slot F, the seventh slot layer is slot G, and the eighth slot layer is slot H.

[0305] like Figure 9 As shown, when x = 10, the winding path of the first branch of phase U of stator winding 20 is as follows:

[0306] (U1+)-10A-2A-10B-20C-28D-38E-46F-2G-10H-19H-11G-1F-47E-37D-29C-19B-11A-3A-11B-21C-29D-39E-47F-3G- 11H-20H-12G-2F-48E-38D-30C-20B-12A-1A-9B-19C-27D-37E-45F-1G-9H-18H-10G-54F-46E-36D-28C-18B-(U1-);

[0307] like Figure 9 As shown, the winding path of the second branch of phase U of stator winding 20 is as follows:

[0308] (U2+)-10C-54B-46A-38A-46B-2C-10D-20E-28F-38G-46H-1H-47G-37F-29E-19D-11C-1B-47A-39A-47B-3C-11D-21E-29F-39G-47H-2H-48G-38F-30E-20D-12C-2B-48A-37A-45B-1C-9D-19E-27F-37G-45H-54H-46G-36F-28E-18D-(U2-);

[0309] As shown in Figure 9 , the U-phase third branch winding route of the stator winding 20 is as follows:

[0310] (U3+)-10E-54D-46C-36B-28A-20A-28B-38C-46D-2E-10F-20G-28H-37H-29G-19F-11E-1D-47C-37B-29A-21A-29B-39C-47D-3E-11F-21G-29H-38H-30G-20F-12E-2D-48C-38B-30A-19A-27B-37C-45D-1E-9F-19G-27H-36H-28G-18F-(U3-). Thus, different winding requirements of the stator winding 20 can be met, and alternating current loss can be reduced, which is beneficial to improve the efficiency of the motor.

[0311] In some embodiments of the present application, as Figure 10 shown, z=72, m=3, P=6, each of the 72 stator slots 11 has 6 slot layers, which are first slot layer, second slot layer, third slot layer, fourth slot layer, fifth slot layer and sixth slot layer along the radial direction of the stator core 10, and the 3 phases include U phase, V phase and W phase.

[0312] The U-phase first branch winding mode of the stator winding 20 is as follows:

[0313] From the first slot layer, one end of the first first U-shaped hairpin 21 is arranged in the first slot layer, the other end of the first first U-shaped hairpin 21 is arranged in the first slot layer in the direction of decreasing slot number by spanning z / P-1 slot positions, one end of the first third U-shaped hairpin 23 is connected with the other end of the first first U-shaped hairpin 21, one end of the first third U-shaped hairpin 23 is arranged in the second slot layer, the other end of the first third U-shaped hairpin 23 is arranged in the third slot layer in the direction of increasing slot number by spanning x slot positions, one end of the second third U-shaped hairpin 23 is connected with the other end of the first third U-shaped hairpin 23, one end of the second third U-shaped hairpin 23 is arranged in the fourth slot layer, the other end of the second third U-shaped hairpin 23 is arranged in the fifth slot layer in the direction of increasing slot number by spanning x slot positions, one end of the first fourth U-shaped hairpin 24 is connected with the other end of the second third U-shaped hairpin 23, one end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer in the direction of increasing slot number by spanning z / P slot positions,

[0314] From the sixth slot layer again, the third third U-shaped hairpin 23 and the fourth third U-shaped hairpin 23 are respectively rotated by z / P-1 slot positions in the direction of increasing slot number from the second third U-shaped hairpin 23 and the first third U-shaped hairpin 23, wherein the other end of the first fourth U-shaped hairpin 24 is connected with one end of the third third U-shaped hairpin 23, the other end of the third third U-shaped hairpin 23 is connected with one end of the fourth third U-shaped hairpin 23, to form a first coil of winding, and the winding is performed to all stator slots 11 in the same way.

[0315] Therefore, one winding of the U-phase first branch of the stator winding 20 is realized, the winding requirement on the stator core 10 can be realized, each stator slot 11 is wound in six layers, there are 72 stator slots 11, the space utilization can be further improved, and the efficiency and thermal stability of the motor are ensured. At the same time, x < z / P, x > z / P or x = z / P, different choices of the span of the third U-shaped hairpin 23 can be realized, greater freedom is provided for the design of the stator winding 20, different use requirements can be met, and adjustment can be facilitated according to the specific performance requirements of the motor.

[0316] In the second and third turns of the first branch, one end of the second first U-shaped hairpin 21 and one end of the third first U-shaped hairpin 21 are both arranged in the first slot layer, and the other end of the second first U-shaped hairpin 21 and the other end of the third first U-shaped hairpin 21 are both arranged in the first slot layer by spanning z / P-1 slot positions in the direction of decreasing slot number, and in the fourth turn of the first branch, one end of the first second U-shaped hairpin 22 is arranged in the first slot layer, and the other end of the first second U-shaped hairpin 22 is arranged in the first slot layer by spanning z / P+(the number of slots per pole per phase-1) slot positions in the direction of decreasing slot number, so that the first, second, third and fourth turns are misaligned when connected, facilitating connection between each other, avoiding the connection of sub-coils through the connection part in the related art, reducing the connection structure of the sub-coil, making the process simple, reducing manufacturing costs, and reducing the occupied space of the stator assembly 100.

[0317] In addition, in the U-phase first branch of the stator winding 20, only four types of U-shaped hairpin wire types (i.e., the first U-shaped hairpin 21, the second U-shaped hairpin 22, the third U-shaped hairpin 23, and the fourth U-shaped hairpin 24) are used to realize the winding of the stator core 10, thereby realizing the few wire type structure design of the stator winding 20, facilitating the saving of wire type mold cost and production rhythm, making the manufacturing simple, and reducing the manufacturing cost.

[0318] The winding method of the U-phase second branch of the stator winding 20 is as follows:

[0319] From the third slot layer, one end of the first third U-shaped hairpin 23 is arranged in the third slot layer, the other end of the first third U-shaped hairpin 23 is arranged in the second slot layer by spanning x slot positions in the direction of decreasing slot number, one end of the first first U-shaped hairpin 21 is connected to the other end of the first third U-shaped hairpin 23, one end of the first first U-shaped hairpin 21 is arranged in the first slot layer, and the other end of the first first U-shaped hairpin 21 is arranged in the first slot layer by spanning z / P-1 slot positions in the direction of decreasing slot number,

[0320] From the first slot layer, a second third U-shaped hairpin 23 is obtained by rotating the first third U-shaped hairpin 23 in the direction of decreasing slot number by z / P-1 slot positions, one end of the second third U-shaped hairpin 23 is connected to the other end of the first first U-shaped hairpin 21, one end of a third third U-shaped hairpin 23 is connected to the other end of the second third U-shaped hairpin 23, one end of the third third U-shaped hairpin 23 is arranged in the fourth slot layer, the other end of the third third U-shaped hairpin 23 is arranged in the fifth slot layer by crossing x slot positions in the direction of increasing slot number, one end of the first fourth U-shaped hairpin 24 is connected to the other end of the third third U-shaped hairpin 23, one end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer by crossing z / P slot positions in the direction of increasing slot number,

[0321] From the sixth slot layer, a fourth third U-shaped hairpin 23 is obtained by rotating the third third U-shaped hairpin 23 in the direction of increasing slot number by z / P-1 slot positions, one end of the fourth third U-shaped hairpin 23 is connected to the other end of the first fourth U-shaped hairpin 24, forming a first loop of winding, and winding to all stator slots 11 in the same way.

[0322] Thus, one loop of winding of the U-phase second branch of the stator winding 20 is realized, the winding requirement on the stator core 10 can be realized, and each stator slot 11 is wound in six layers, the stator slots 11 are 72, the space utilization can be further improved, and the efficiency and thermal stability of the motor are ensured. At the same time, x < z / P, x > z / P or x = z / P, different choices of the span of the third U-shaped hairpin 23 can be realized, greater freedom is provided for the design of the stator winding 20, different use requirements can be met, and adjustment according to the specific performance requirements of the motor is facilitated.

[0323] In the second loop winding and the third loop winding of the second branch, one end of the second first U-shaped hairpin 21 and one end of the third first U-shaped hairpin 21 are arranged in the first slot layer, the other end of the second first U-shaped hairpin 21 and the other end of the third first U-shaped hairpin 21 are arranged in the first slot layer by crossing z / P-1 slot positions in the direction of decreasing slot number, in the fourth loop winding of the second branch, one end of the first second U-shaped hairpin 22 is arranged in the first slot layer, the other end of the first second U-shaped hairpin 22 is arranged in the first slot layer by crossing z / P+(number of slots per phase per pole-1) slot positions in the direction of decreasing slot number, which can cause misalignment when the first loop, the second loop, the third loop and the fourth loop are connected, facilitate connection between each other, avoid connection of sub-coils through the connection part in the related art, reduce the connection structure of the sub-coil, make the process simple, reduce the manufacturing cost, and reduce the occupied space of the stator assembly 100.

[0324] In addition, in the U-phase second branch of the stator winding 20, only four U-shaped hairpin wire types (i.e., the first U-shaped hairpin 21, the second U-shaped hairpin 22, the third U-shaped hairpin 23, and the fourth U-shaped hairpin 24) are used to implement the winding of the stator core 10, so that the few-wire type structure design of the stator winding 20 can be implemented, the wire type mold cost and production rhythm can be saved, the manufacturing is simple, and the manufacturing cost can be reduced.

[0325] The winding mode of the U-phase third branch of the stator winding 20 is as follows:

[0326] Starting from the fifth slot layer, one end of the first third U-shaped hairpin 23 is arranged in the fifth slot layer, the other end of the first third U-shaped hairpin 23 is arranged in the fourth slot layer by spanning x slot positions in the direction of decreasing slot number, one end of the second third U-shaped hairpin 23 is connected to the other end of the first third U-shaped hairpin 23, one end of the second third U-shaped hairpin 23 is arranged in the third slot layer, the other end of the second third U-shaped hairpin 23 is arranged in the second slot layer by spanning x slot positions in the direction of decreasing slot number, one end of the first first U-shaped hairpin 21 is connected to the other end of the second third U-shaped hairpin 23, one end of the first first U-shaped hairpin 21 is arranged in the first slot layer, and the other end of the first first U-shaped hairpin 21 is arranged in the first slot layer by spanning z / P-1 slot positions in the direction of decreasing slot number,

[0327] Starting from the first slot layer again, the third third U-shaped hairpin 23 and the fourth third U-shaped hairpin 23 are obtained by rotating the second third U-shaped hairpin 23 and the first third U-shaped hairpin 23 by z / P-1 slot positions in the direction of decreasing slot number, respectively, wherein the other end of the first first U-shaped hairpin 21 is connected to one end of the third third U-shaped hairpin 23, the other end of the third third U-shaped hairpin 23 is connected to one end of the fourth third U-shaped hairpin 23, one end of the first fourth U-shaped hairpin 24 is connected to the other end of the fourth third U-shaped hairpin 23, one end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin 24 is arranged in the sixth slot layer by spanning z / P slot positions in the direction of increasing slot number, to form a first circle of winding, and the winding is performed in the same manner to all stator slots 11.

[0328] Thus, one circle of winding of the U-phase third branch of the stator winding 20 is implemented, the winding requirement on the stator core 10 can be met, each stator slot 11 is wound in six layers, there are 72 stator slots 11, the space utilization can be further improved, and the efficiency and thermal stability of the motor can be ensured. Meanwhile, x < z / P, x > z / P, or x = z / P, different selections of the span of the third U-shaped hairpin 23 can be implemented, greater freedom is provided for the design of the stator winding 20, different use requirements can be met, and adjustment can be made according to the specific performance requirements of the motor.

[0329] In the second and third turns of the third branch winding, one end of the second and third first U-shaped hairpins 21 are both inserted into the first slot layer, and the other ends of the second and third first U-shaped hairpins 21 are both placed in the first slot layer across z / P-1 slots in the direction of decreasing slot number. In the fourth turn of the third branch winding, one end of the first second U-shaped hairpin 22 is inserted into the first slot layer, and the other end of the first second U-shaped hairpin 22 is placed in the first slot layer across z / P+(slot number per pole per phase - 1) slots in the direction of decreasing slot number. This allows for misalignment when the first, second, third, and fourth turns are connected, facilitating mutual connection and avoiding the connection of sub-coils through connecting parts in related technologies. This reduces the connection structure of sub-coils, simplifies the process, reduces manufacturing costs, and reduces the space occupied by the stator assembly 100.

[0330] Furthermore, in the third branch of the U phase of the stator winding 20, only four types of U-shaped hairpin wires (i.e., the first U-shaped hairpin 21, the second U-shaped hairpin 22, the third U-shaped hairpin 23 and the fourth U-shaped hairpin 24) are used to achieve the winding of the stator core 10, thereby enabling the stator winding 20 to have a fewer wire type structure design, which is convenient for saving wire type mold costs and production cycle, making manufacturing simple and reducing manufacturing costs.

[0331] Therefore, the U-phase winding is wound in three branches, which ensures the uniform distribution of current in the stator slot 11, reduces the generation of unbalanced current, and improves the smoothness and reliability of motor operation.

[0332] The winding methods for phases U, V, and W are the same. The winding method for phase V is obtained by rotating phase U by 4 slots in either the direction of increasing or decreasing slot number. This facilitates the control of swapping the positive and negative poles of phases U and V. The winding method for phase W is obtained by rotating phase U by 8 slots in either the direction of increasing or decreasing slot number. This facilitates the control of the positive and negative poles of phases U and W, meets the winding requirements for phases V and W, and ensures a compact structure.

[0333] For example, in some embodiments, such as Figure 10 As shown, the first trench layer is trench A, the second trench layer is trench B, the third trench layer is trench C, the fourth trench layer is trench D, the fifth trench layer is trench E, and the sixth trench layer is trench F.

[0334] like Figure 10 As shown, when x = 13, the winding path of the first branch of phase U of stator winding 20 is as follows:

[0335] (U1+)-13A-2A-13B-26C-37D-50E-61F-1F-62E-49D-38C-25B-14A-3A-14B-27C-38D-51E-62F-2F-63E-50D-39C-26B-15A-4A-15B-28C-39D-52E-63F-3F-64E-51D-40C-27B-16A-1A-12B-25C-36D-49E-60F-72F-61E-48D-37C-24B-(U1-);

[0336] As shown in Figure 10 , the U-phase second branch winding route of the stator winding 20 is as follows:

[0337] (U2+)-13C-72B-61A-50A-61B-2C-13D-26E-37F-49F-38E-25D-14C-1B-62A-51A-62B-3C-14D-27E-38F-50F-39E-26D-15C-2B-63A-52A-63B-4C-15D-28E-39F-51F-40E-27D-16C-3B-64A-49A-60B-1C-12D-25E-36F-48F-37E-24D-(U2-);

[0338] As shown in Figure 10 , the U-phase third branch winding route of the stator winding 20 is as follows:

[0339] (U3+)-13E-72D-61C-48B-37A-26A-37B-50C-61D-2E-13F-25F-14E-1D-62C-49B-38A-27A-38B-51C-62D-3E-14F-26F-15E-2D-63C-50B-39A-28A-39B-52C-63D-4E-15F-27F-16E-3D-64C-51B-41A-25A-36B-49C-60D-1E-12F-24F-(U3-). Thus, different winding requirements of the stator winding 20 can be met, and the efficiency of the motor can be improved.

[0340] According to some embodiments of the present application, as Figure 9As shown, M ≥ 8. Therefore, the more slot layers in the stator slot 11, the lower the AC loss of the motor, meeting the required usage needs, improving space utilization, and ensuring the motor's efficiency and thermal stability. Simultaneously, it facilitates the adjustment of the position of the outgoing line structure 50 of at least one branch, making the structural design more flexible and able to meet different configuration requirements. For example, the outgoing line structure 50 of the first branch of phase U can be located between the first and second slot layers, or between the seventh and eighth slot layers. For example, in some specific embodiments, M can be 8, 9, 10, 11, 12, 13, etc.

[0341] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, each phase includes m parallel branches, each of which has a first connection end 31 and a second connection end 32. The stator assembly 100 includes a neutral point copper plate 40, which includes a connecting part 41 and a branch part 42. The connecting part 41 extends along the circumferential direction of the stator core 10, and there are m branches 42. The m branches 42 are spaced apart along the length direction of the connecting part 41. Each branch 42 is connected to the m first connection ends 31 of each phase, which can realize the connection between the neutral point copper plate 40 and the m branches, thus meeting the required connection requirements.

[0342] In addition, such as Figure 1 and Figure 2 As shown, the stator assembly 100 also includes outgoing wire structures 50, of which there are m outgoing wire structures 50. Each outgoing wire structure 50 is connected to m second connection terminals 32 of each phase. Through the outgoing wire structures 50, the stator winding 20 can be connected to other external structures (such as controllers) to meet the required connection requirements. At the same time, the outgoing wire structures 50 and the neutral point copper plate 40 are located on the same side of the stator core 10 in the axial direction, which can optimize the space of the stator assembly 100 and help reduce the size of the motor.

[0343] In some embodiments, the branch 42 is welded to the first connection end 31 to ensure a reliable connection and reduce production costs.

[0344] In some embodiments, the outgoing cable structure 50 and the second connecting end 32 are connected by welding to ensure reliable connection and reduce production costs.

[0345] According to some embodiments of this utility model, such as Figures 3-10 As shown, the first connection ends 31 of the m branches are led out from the same stator slot 11, so that the positions of the m first connection ends 31 are concentrated, which facilitates the connection of the m first connection ends 31 with the neutral point copper plate 40, making the connection more convenient, reducing the complexity of the connection path, making the structure compact, saving space, and reducing the difficulty and cost of connection.

[0346] In some embodiments of the utility model, as shown in Figures 3-10 m=3, 3 phases include U phase, V phase and W phase, each branch of U phase is located in continuous multiple stator slots 11, each branch of V phase is located in continuous multiple stator slots 11, each branch of W phase is located in continuous multiple stator slots 11, and the multiple stator slots 11 where the corresponding branches of U phase, V phase and W phase are located are continuously arranged. Therefore, the branches of U phase, V phase and W phase are staggered and located in adjacent poles, the layout is regular and orderly, connection is facilitated, the complexity of the connection path can be reduced, the structure is compact, space can be saved, and the connection difficulty and cost can be reduced.

[0347] According to some embodiments of the utility model, as shown in Figure 1 The wire outlet structure 50 is a one-piece, the wire outlet structure 50 of the one-piece has good structural strength and rigidity, and the copper nose required in the related art can be saved, the manufacturing and installation process is facilitated, and the manufacturing cost is reduced.

[0348] The motor according to the embodiment of the utility model comprises the stator assembly 100 according to the embodiment of the utility model. Since the stator assembly 100 according to the embodiment of the utility model has the beneficial technical effects described above, the motor according to the embodiment of the utility model is used in a motor with z-slot P-level m-phase, each branch of each phase comprises at least one first U-shaped hairpin 21 and one second U-shaped hairpin 22, the first U-shaped hairpin 21 and the second U-shaped hairpin 22 have different spans, the first U-shaped hairpin 21 and the second U-shaped hairpin 22 are both arranged in the first slot layer or the Mth slot layer, or the two ends of the first U-shaped hairpin 21 and the second U-shaped hairpin 22 are arranged in adjacent two slot layers, so that the first U-shaped hairpin 21 and the second U-shaped hairpin 22 of each branch of each phase have different spans, the branches are facilitated to be connected in a staggered manner, the connection of the sub-coils in the related art through the connection part is avoided, the process is simple, the manufacturing cost is reduced, and the occupied space of the stator assembly 100 is reduced.

[0349] In some embodiments, the motor further comprises a rotor, the rotor has a magnetic steel, and the rotor is rotatably arranged in the stator assembly 100. The stator assembly 100 is supplied with alternating current (for example, three-phase alternating current), so that the stator assembly 100 generates a rotating magnetic field, and the rotor can rotate in the rotating magnetic field to realize the operation of the motor.

[0350] The vehicle according to the embodiment of the utility model comprises the motor according to the embodiment of the utility model. Since the motor according to the embodiment of the utility model has the beneficial technical effects described above, the vehicle according to the embodiment of the utility model is used in a motor with z-slot P-stage m-phase through the stator winding 20, each branch of each phase comprises at least one first U-shaped hairpin 21 and one second U-shaped hairpin 22, the first U-shaped hairpin 21 and the second U-shaped hairpin 22 have different spans, the first U-shaped hairpin 21 and the second U-shaped hairpin 22 are arranged in the first slot layer or the Mth slot layer, or the two ends of the first U-shaped hairpin 21 and the second U-shaped hairpin 22 are arranged in the adjacent two slot layers, so that the spans of the first U-shaped hairpin 21 and the second U-shaped hairpin 22 of each branch of each phase are different, the branches are facilitated to be connected in a staggered manner, the connection of the sub-coils in the related art through the connecting part is avoided, the process is simple, the manufacturing cost can be reduced, and the occupied space of the stator assembly 100 can be reduced.

[0351] The vehicle can be a new energy vehicle.

[0352] The stator assembly 100, the motor and the vehicle according to the embodiment of the utility model are known to those skilled in the art, and will not be described in detail here.

[0353] In the description of the utility model, it should be pointed out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0354] In the description of the specification, the description of the terms "embodiment", "specific embodiment", "example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0355] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A stator assembly characterized by, The application relates to a stator core, a stator winding and a motor. The stator core has a plurality of stator slots arranged at intervals along a circumferential direction of the stator core, each of the stator slots has M slot layers arranged in a radial direction; The stator winding comprises first and second U-shaped hairpins with different spans, is used in a motor with z-slot P-stage m-phase, each branch of each phase comprises at least one first U-shaped hairpin and one second U-shaped hairpin, each of the stator slots has first to Mth slot layers arranged in the radial direction in sequence, the first and second U-shaped hairpins are arranged in the first slot layer or the Mth slot layer, or the two ends of the first and second U-shaped hairpins are arranged in two adjacent slot layers respectively.

2. The stator assembly of claim 1, wherein, The number of slots per pole per phase is z / P / m, the span of the first U-shaped hairpin is z / P-1, and the span of the second U-shaped hairpin is z / P+(the number of slots per pole per phase-1); or the span of the first U-shaped hairpin is z / P+1, and the span of the second U-shaped hairpin is z / P-(the number of slots per pole per phase-1). When M is even, the second to (M-1)th slot layers are divided into M / 2-1 groups arranged in the radial direction of the stator core, and when M is odd, the second to Mth slot layers are divided into (M-1) / 2 groups arranged in the radial direction of the stator core, each group comprises two adjacent slot layers, and the stator winding comprises:

3. The stator assembly of claim 2, wherein, Third U-shaped hairpins, the first and second U-shaped hairpins are arranged in the first slot layer or the Mth slot layer of the same group, and the two ends of the third U-shaped hairpin are arranged in two different slot layers of the same group; or the two ends of the first and second U-shaped hairpins are arranged in two different slot layers of the same group, and the third U-shaped hairpin is arranged in the first slot layer or the Mth slot layer of the same group. The span of the third U-shaped hairpin is less than z / P; or the span of the third U-shaped hairpin is greater than z / P; or the span of the third U-shaped hairpin is equal to z / P.

4. The stator assembly of claim 3, wherein, When M is even, the stator winding further comprises: Fourth U-shaped hairpins, the span of the fourth U-shaped hairpin is z / P, when the first and second U-shaped hairpins are arranged in the first slot layer of the same group, the fourth U-shaped hairpin is arranged in the Mth slot layer; or when the first and second U-shaped hairpins are arranged in the Mth slot layer of the same group, the fourth U-shaped hairpin is arranged in the first slot layer. z=54, m=3, P=6, each of the 54 stator slots has six slot layers, which are sequentially arranged in the radial direction of the stator core as a first slot layer, a second slot layer, a third slot layer, a fourth slot layer, a fifth slot layer and a sixth slot layer, and the three phases comprise a U phase, a V phase and a W phase, 5. The stator assembly of claim 3, wherein, The winding mode of a first branch of the U phase of the stator winding is as follows: ​ 6. The stator assembly of claim 5, wherein, ​ ​ From the first slot layer, one end of a first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by z / P-1 slot positions, one end of a first third U-shaped hairpin is connected with the other end of the first first U-shaped hairpin, one end of the first third U-shaped hairpin is arranged in the second slot layer, the other end of the first third U-shaped hairpin is arranged in the third slot layer in the direction of increasing slot number by x slot positions, one end of a second third U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the fourth slot layer, the other end of the second third U-shaped hairpin is arranged in the fifth slot layer in the direction of increasing slot number by x slot positions, one end of a first fourth U-shaped hairpin is connected with the other end of the second third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer in the direction of increasing slot number by z / P slot positions, From the sixth slot layer again, a third third U-shaped hairpin and a fourth third U-shaped hairpin are respectively rotated by z / P-1 slot positions in the direction of increasing slot number from the second third U-shaped hairpin and the first third U-shaped hairpin, wherein the other end of the first fourth U-shaped hairpin is connected with one end of the third third U-shaped hairpin, the other end of the third third U-shaped hairpin is connected with one end of the fourth third U-shaped hairpin, to form a first coil winding, and the winding is performed to all the stator slots in the same manner, The winding mode of a second branch of a U phase of the stator winding is as follows: From the third slot layer, one end of a first third U-shaped hairpin is arranged in the third slot layer, the other end of the first third U-shaped hairpin is arranged in the second slot layer in the direction of decreasing slot number by x slot positions, one end of a first first U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by z / P-1 slot positions, From the first slot layer, a second third U-shaped hairpin is obtained by rotating the first third U-shaped hairpin by z / P-1 slot positions in the direction of decreasing slot number, one end of the second third U-shaped hairpin is connected to the other end of the first first U-shaped hairpin, one end of a third third U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the third third U-shaped hairpin is arranged in the fourth slot layer, the other end of the third third U-shaped hairpin is arranged in the fifth slot layer by crossing x slot positions in the direction of increasing slot number, one end of a first fourth U-shaped hairpin is connected to the other end of the third third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer by crossing z / P slot positions in the direction of increasing slot number, From the sixth slot layer, a fourth third U-shaped hairpin is obtained by rotating the third third U-shaped hairpin by z / P-1 slot positions in the direction of increasing slot number, one end of the fourth third U-shaped hairpin is connected to the other end of the first fourth U-shaped hairpin, to form a first round of winding, and the winding is performed in the same manner to all the stator slots, The winding mode of the U-phase third branch of the stator winding is as follows: From the fifth slot layer, one end of the first third U-shaped hairpin is arranged in the fifth slot layer, the other end of the first third U-shaped hairpin is arranged in the fourth slot layer by crossing x slot positions in the direction of decreasing slot number, one end of a second third U-shaped hairpin is connected to the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the third slot layer, the other end of the second third U-shaped hairpin is arranged in the second slot layer by crossing x slot positions in the direction of decreasing slot number, one end of a first first U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer by crossing z / P-1 slot positions in the direction of decreasing slot number, From the first slot layer, a third third U-shaped hairpin and a fourth third U-shaped hairpin are respectively obtained by rotating the second third U-shaped hairpin and the first third U-shaped hairpin by z / P-1 slot positions in the direction of decreasing slot number, wherein the other end of the first first U-shaped hairpin is connected to one end of the third third U-shaped hairpin, the other end of the third third U-shaped hairpin is connected to one end of the fourth third U-shaped hairpin, one end of a first fourth U-shaped hairpin is connected to the other end of the fourth third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer by crossing z / P slot positions in the direction of increasing slot number, to form a first round of winding, and the winding is performed in the same manner to all the stator slots, Wherein, in the second circle winding of the first branch, the second branch and the third branch, one end of the second first U-shaped hairpin is arranged in the first slot layer, the other end of the second first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by crossing z / P-1 slot positions, in the third circle winding of the first branch, the second branch and the third branch, one end of the first second U-shaped hairpin is arranged in the first slot layer, the other end of the first second U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by crossing z / P+(the number of slots per pole per phase-1) slot positions, and x Or, the U-phase first branch winding mode of the stator winding is as follows: From the first slot layer, one end of the first second U-shaped hairpin is arranged in the first slot layer, the other end of the first second U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by crossing z / P-(the number of slots per pole per phase-1) slot positions, one end of the first third U-shaped hairpin is connected with the other end of the first second U-shaped hairpin, one end of the first third U-shaped hairpin is arranged in the second slot layer, the other end of the first third U-shaped hairpin is arranged in the third slot layer in the direction of increasing slot number by crossing x slot positions, one end of the second third U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the fourth slot layer, the other end of the second third U-shaped hairpin is arranged in the fifth slot layer in the direction of increasing slot number by crossing x slot positions, one end of the first fourth U-shaped hairpin is connected with the other end of the second third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer in the direction of increasing slot number by crossing z / P slot positions, From the sixth slot layer again, the third third U-shaped hairpin and the fourth third U-shaped hairpin are respectively rotated z / P-1 slot positions in the direction of increasing slot number from the second third U-shaped hairpin and the first third U-shaped hairpin, wherein the other end of the first fourth U-shaped hairpin is connected with one end of the third third U-shaped hairpin, the other end of the third third U-shaped hairpin is connected with one end of the fourth third U-shaped hairpin, forming a first circle winding, and winding to all the stator slots in the same way, The U-phase second branch winding mode of the stator winding is as follows: From the third slot layer, one end of the first third U-shaped hairpin is arranged in the third slot layer, the other end of the first third U-shaped hairpin is arranged in the second slot layer in the direction of decreasing slot number by crossing x slot positions, one end of the first second U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the first second U-shaped hairpin is arranged in the first slot layer, the other end of the first second U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by crossing z / P-(the number of slots per pole per phase-1) slot positions, From the first slot layer, a first third U-shaped hairpin is obtained by rotating the first second U-shaped hairpin by z / P slots in the direction of decreasing slot number, one end of the first third U-shaped hairpin is connected to the other end of the first second U-shaped hairpin, one end of a second third U-shaped hairpin is connected to the other end of the first third U-shaped hairpin, the other end of the second third U-shaped hairpin is arranged in the fourth slot layer, one end of a first fourth U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer by z / P slots in the direction of increasing slot number, and a first loop of winding is formed, From the sixth slot layer, a fourth third U-shaped hairpin is obtained by rotating the third third U-shaped hairpin by z / P-1 slots in the direction of increasing slot number, one end of the fourth third U-shaped hairpin is connected to the other end of the first fourth U-shaped hairpin, a first loop of winding is formed, and winding is performed in the same manner to all the stator slots, The winding mode of the U-phase third branch of the stator winding is as follows: From the fifth slot layer, one end of the first third U-shaped hairpin is arranged in the fifth slot layer, the other end of the first third U-shaped hairpin is arranged in the fourth slot layer by x slots in the direction of decreasing slot number, one end of a second third U-shaped hairpin is connected to the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the third slot layer, the other end of the second third U-shaped hairpin is arranged in the second slot layer by x slots in the direction of decreasing slot number, one end of a first second U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the first second U-shaped hairpin is arranged in the first slot layer, and the other end of the first second U-shaped hairpin is arranged in the first slot layer by z / P-(the number of slots per pole per phase-1) slots in the direction of decreasing slot number, From the first slot layer, a third third U-shaped hairpin and a fourth third U-shaped hairpin are respectively obtained by rotating the second third U-shaped hairpin and the first third U-shaped hairpin by z / P-1 slots in the direction of decreasing slot number, wherein the other end of the first second U-shaped hairpin is connected to one end of the third third U-shaped hairpin, the other end of the third third U-shaped hairpin is connected to one end of the fourth third U-shaped hairpin, one end of a first fourth U-shaped hairpin is connected to the other end of the fourth third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer by z / P slots in the direction of increasing slot number, a first loop of winding is formed, and winding is performed in the same manner to all the stator slots, Wherein, in the second circle winding of the first branch, the second branch and the third branch, one end of the first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by spanning z / P+1 slot positions, in the third circle winding of the first branch, the second branch and the third branch, one end of the second first U-shaped hairpin is arranged in the first slot layer, the other end of the second first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by spanning z / P+1 slot positions, and x < z / P, x > z / P or x = z / P, Or, the U-phase first branch winding mode of the stator winding is as follows: From the first slot layer, one end of the first third U-shaped hairpin is arranged in the first slot layer, the other end of the first third U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by spanning x slot positions, one end of the first first U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the first first U-shaped hairpin is arranged in the second slot layer, the other end of the first first U-shaped hairpin is arranged in the third slot layer in the direction of increasing slot number by spanning z / P+1 slot positions, one end of the second third U-shaped hairpin is connected with the other end of the first first U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the fourth slot layer, the other end of the second third U-shaped hairpin is arranged in the fifth slot layer in the direction of increasing slot number by spanning x slot positions, one end of the first fourth U-shaped hairpin is connected with the other end of the second third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer in the direction of increasing slot number by spanning z / P slot positions, From the sixth slot layer again, the third third U-shaped hairpin is obtained by rotating the second third U-shaped hairpin in the direction of increasing slot number by z / P-1 slot positions, the other end of the first fourth U-shaped hairpin is connected with one end of the third third U-shaped hairpin, one end of the fourth third U-shaped hairpin is arranged in the third slot layer, the other end of the fourth third U-shaped hairpin is arranged in the second slot layer in the direction of decreasing slot number by spanning x slot positions, one end of the third third U-shaped hairpin is connected with the other end of the fourth third U-shaped hairpin, forming a first circle winding, and winding to all the stator slots in the same way, The U-phase second branch winding mode of the stator winding is as follows: From the third slot layer, one end of the first third U-shaped hairpin is arranged in the third slot layer, the other end of the first third U-shaped hairpin is arranged in the second slot layer in the direction of decreasing slot number by spanning x slot positions, one end of the second third U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the first slot layer, the other end of the second third U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by spanning x slot positions, From the first slot layer, one end of the first first U-shaped hairpin is arranged in the second slot layer, the other end of the first first U-shaped hairpin is connected with one end of the second third U-shaped hairpin, the other end of the first first U-shaped hairpin is arranged in the third slot layer in the direction of increasing slot number by z / P+1 slot positions, one end of the third third U-shaped hairpin is connected with the other end of the first first U-shaped hairpin, one end of the third third U-shaped hairpin is arranged in the fourth slot layer, the other end of the third third U-shaped hairpin is arranged in the fifth slot layer in the direction of increasing slot number by x slot positions, one end of the first fourth U-shaped hairpin is connected with the other end of the third third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer in the direction of increasing slot number by z / P slot positions, From the sixth slot layer, the fourth third U-shaped hairpin is obtained by rotating the third third U-shaped hairpin in the direction of increasing slot number by z / P-1 slot positions, one end of the fourth third U-shaped hairpin is connected with the other end of the first fourth U-shaped hairpin, to form a first coil, and the winding is performed to all the stator slots in the same manner, The winding mode of the third branch of the U phase of the stator winding is as follows: From the fifth slot layer, one end of the first third U-shaped hairpin is arranged in the fifth slot layer, the other end of the first third U-shaped hairpin is arranged in the fourth slot layer in the direction of decreasing slot number by x slot positions, one end of the second third U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the third slot layer, the other end of the second third U-shaped hairpin is arranged in the second slot layer in the direction of decreasing slot number by x slot positions, one end of the third third U-shaped hairpin is connected with the other end of the second third U-shaped hairpin, one end of the third third U-shaped hairpin is arranged in the first slot layer, and the other end of the third third U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by x slot positions, The other end of the first first U-shaped hairpin is arranged in the third slot layer in the direction of increasing slot number by z / P+1 slot positions, the fourth third U-shaped hairpin is obtained by rotating the first third U-shaped hairpin in the direction of decreasing slot number by z / P-1 slot positions, the other end of the first first U-shaped hairpin is connected with one end of the fourth third U-shaped hairpin, one end of the first fourth U-shaped hairpin is connected with the other end of the fourth third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, and the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer in the direction of increasing slot number by z / P slot positions, to form the first circle of winding, and the winding is performed to all the stator slots in the same way, In the second circle of winding of the first branch, the second branch and the third branch, one end of the second first U-shaped hairpin is arranged in the second slot layer, and the other end of the second first U-shaped hairpin is arranged in the third slot layer in the direction of increasing slot number by z / P+1 slot positions, in the third circle of winding of the first branch, the second branch and the third branch, one end of the first second U-shaped hairpin is arranged in the second slot layer, the other end of the first second U-shaped hairpin is arranged in the third slot layer in the direction of increasing slot number by z / P-(the number of slots per pole per phase-1) slot positions, and x<z / P, x>z / P or x=z / P, The winding methods of the U phase, the V phase and the W phase are the same, the winding method of the V phase winding is that the U phase winding is rotated by 3 slot positions in the direction of increasing slot number or in the direction of decreasing slot number, and the winding method of the W phase winding is that the U phase winding is rotated by 6 slot positions in the direction of increasing slot number or in the direction of decreasing slot number.

7. The stator assembly of claim 5, wherein, z=54, m=3, P=6, each of the 54 stator slots has 7 slot layers, and the slot layers are sequentially arranged in the radial direction of the stator core as a first slot layer, a second slot layer, a third slot layer, a fourth slot layer, a fifth slot layer, a sixth slot layer and a seventh slot layer, and the three phases include a U phase, a V phase and a W phase, The winding method of the U phase first branch of the stator winding is as follows: From the first slot layer, one end of a first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by z / P-1 slot positions, one end of a first third U-shaped hairpin is connected with the other end of the first first U-shaped hairpin, one end of the first third U-shaped hairpin is arranged in the second slot layer, the other end of the first third U-shaped hairpin is arranged in the third slot layer in the direction of increasing slot number by x slot positions, one end of a second third U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the fourth slot layer, the other end of the second third U-shaped hairpin is arranged in the fifth slot layer in the direction of increasing slot number by x slot positions, one end of a third third U-shaped hairpin is connected with the other end of the second third U-shaped hairpin, one end of the third third U-shaped hairpin is arranged in the sixth slot layer, the other end of the third third U-shaped hairpin is arranged in the seventh slot layer in the direction of increasing slot number by x slot positions, From the seventh slot layer again, a fourth third U-shaped hairpin, a fifth third U-shaped hairpin and a sixth third U-shaped hairpin are obtained by rotating the third third U-shaped hairpin, the second third U-shaped hairpin and the first third U-shaped hairpin by z / P-1 slot positions in the direction of increasing slot number respectively, wherein the other end of the third third U-shaped hairpin is connected with one end of the fourth third U-shaped hairpin, the other end of the fourth third U-shaped hairpin is connected with one end of the fifth third U-shaped hairpin, the other end of the fifth third U-shaped hairpin is connected with one end of the sixth third U-shaped hairpin, to form a first coil winding, and the winding is performed to all the stator slots in the same manner, The winding mode of a second branch of a U phase of the stator winding is as follows: From the third slot layer, one end of a first third U-shaped hairpin is arranged in the third slot layer, the other end of the first third U-shaped hairpin is arranged in the second slot layer in the direction of decreasing slot number by x slot positions, one end of a first first U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by z / P-1 slot positions, From the first slot layer, a second third U-shaped hairpin is obtained by rotating the first third U-shaped hairpin by z / P-1 slot positions in a direction in which the slot number decreases, one end of the second third U-shaped hairpin is connected to the other end of the first first U-shaped hairpin, one end of a third third U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the third third U-shaped hairpin is arranged in the fourth slot layer, the other end of the third third U-shaped hairpin is arranged in the fifth slot layer by crossing x slot positions in a direction in which the slot number increases, one end of a fourth third U-shaped hairpin is connected to the other end of the third third U-shaped hairpin, one end of the fourth third U-shaped hairpin is arranged in the sixth slot layer, the other end of the fourth third U-shaped hairpin is arranged in the seventh slot layer by crossing x slot positions in a direction in which the slot number increases, From the seventh slot layer, a fifth third U-shaped hairpin and a sixth third U-shaped hairpin are obtained by rotating the fourth third U-shaped hairpin and the third third U-shaped hairpin by z / P-1 slot positions in a direction in which the slot number increases, respectively, one end of the fifth third U-shaped hairpin is connected to the other end of the first fourth U-shaped hairpin, the other end of the fifth third U-shaped hairpin is connected to one end of the sixth third U-shaped hairpin, to form a first coil, and the winding is performed in the same manner to all the stator slots, The winding mode of the third branch of the U phase of the stator winding is as follows: From the fifth slot layer, one end of the first third U-shaped hairpin is arranged in the fifth slot layer, the other end of the first third U-shaped hairpin is arranged in the fourth slot layer by crossing x slot positions in a direction in which the slot number decreases, one end of a second third U-shaped hairpin is connected to the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the third slot layer, the other end of the second third U-shaped hairpin is arranged in the second slot layer by crossing x slot positions in a direction in which the slot number decreases, one end of the first first U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the first first U-shaped hairpin is arranged in the first slot layer, and the other end of the first first U-shaped hairpin is arranged in the first slot layer by crossing z / P-1 slot positions in a direction in which the slot number decreases, From the first slot layer, a third third U-shaped hairpin and a fourth third U-shaped hairpin are obtained by rotating the second third U-shaped hairpin and the first third U-shaped hairpin by z / P-1 slot positions in a direction in which the slot number decreases, respectively, the other end of the first first U-shaped hairpin is connected to one end of the third third U-shaped hairpin, the other end of the third third U-shaped hairpin is connected to one end of the fourth third U-shaped hairpin, one end of a fifth third U-shaped hairpin is connected to the other end of the fourth third U-shaped hairpin, one end of the fifth third U-shaped hairpin is arranged in the sixth slot layer, and the other end of the fifth third U-shaped hairpin is arranged in the seventh slot layer by crossing z / P-1 slot positions in a direction in which the slot number increases, From the seventh slot layer, a sixth third U-shaped hairpin is obtained by rotating the fifth third U-shaped hairpin in the direction of increasing slot number by z / P-1 slot positions, one end of the sixth third U-shaped hairpin is connected to the other end of the first fourth U-shaped hairpin to form the first circle of winding, and winding is performed in the same manner to all the stator slots, In the second circle of winding of the first branch, the second branch and the third branch, one end of the second first U-shaped hairpin is arranged in the first slot layer, the other end of the second first U-shaped hairpin is arranged in the first slot layer by spanning z / P-1 slot positions in the direction of decreasing slot number, in the third circle of winding of the first branch, the second branch and the third branch, one end of the first second U-shaped hairpin is arranged in the first slot layer, the other end of the first second U-shaped hairpin is arranged in the first slot layer by spanning z / P+(the number of slots per phase per pole-1) slot positions in the direction of decreasing slot number, and x<z / P, x>z / P or x=z / P, The winding methods of the U phase, the V phase and the W phase are the same, the winding method of the V phase winding is obtained by rotating the U phase winding in the direction of increasing slot number or in the direction of decreasing slot number by 3 slot positions, and the winding method of the W phase winding is obtained by rotating the U phase winding in the direction of increasing slot number or in the direction of decreasing slot number by 6 slot positions.

8. The stator assembly of claim 5, wherein, z=54, m=3, P=6, each of the 54 stator slots has 8 slot layers, which are sequentially arranged in the radial direction of the stator core as the first slot layer, the second slot layer, the third slot layer, the fourth slot layer, the fifth slot layer, the sixth slot layer, the seventh slot layer and the eighth slot layer, and the three phases include the U phase, the V phase and the W phase, The winding method of the U phase first branch of the stator winding is as follows: From the first slot layer, one end of a first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by z / P-1 slot positions, one end of a first third U-shaped hairpin is connected to the other end of the first first U-shaped hairpin, one end of the first third U-shaped hairpin is arranged in the second slot layer, the other end of the first third U-shaped hairpin is arranged in the third slot layer in the direction of increasing slot number by x slot positions, one end of a second third U-shaped hairpin is connected to the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the fourth slot layer, the other end of the second third U-shaped hairpin is arranged in the fifth slot layer in the direction of increasing slot number by x slot positions, one end of a third third U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the third third U-shaped hairpin is arranged in the sixth slot layer, the other end of the third third U-shaped hairpin is arranged in the seventh slot layer in the direction of increasing slot number by x slot positions, one end of a first fourth U-shaped hairpin is connected to the other end of the third third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the eighth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the eighth slot layer in the direction of increasing slot number by z / P slot positions, From the eighth slot layer, a fourth third U-shaped hairpin, a fifth third U-shaped hairpin and a sixth third U-shaped hairpin are obtained by rotating the third third U-shaped hairpin, the second third U-shaped hairpin and the first third U-shaped hairpin by z / P-1 slot positions in the direction of increasing slot number respectively, wherein the other end of the third third U-shaped hairpin is connected to one end of the fourth third U-shaped hairpin, the other end of the fourth third U-shaped hairpin is connected to one end of the fifth third U-shaped hairpin, the other end of the fifth third U-shaped hairpin is connected to one end of the sixth third U-shaped hairpin, forming a first coil winding, and the winding is performed to all the stator slots in the same manner, The winding mode of the second branch of the U phase of the stator winding is as follows: From the third slot layer, one end of a first third U-shaped hairpin is arranged in the third slot layer, the other end of the first third U-shaped hairpin is arranged in the second slot layer in the direction of decreasing slot number by x slot positions, one end of a first first U-shaped hairpin is connected to the other end of the first third U-shaped hairpin, one end of the first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by z / P-1 slot positions, From the first slot layer, a second third U-shaped hairpin is obtained by rotating the first third U-shaped hairpin by z / P-1 slot positions in a direction in which the slot number decreases, one end of the second third U-shaped hairpin is connected to the other end of the first first U-shaped hairpin, one end of a third third U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the third third U-shaped hairpin is arranged in the fourth slot layer, the other end of the third third U-shaped hairpin is arranged in the fifth slot layer by crossing x slot positions in a direction in which the slot number increases, one end of a fourth third U-shaped hairpin is connected to the other end of the third third U-shaped hairpin, one end of the fourth third U-shaped hairpin is arranged in the sixth slot layer, the other end of the fourth third U-shaped hairpin is arranged in the seventh slot layer by crossing x slot positions in a direction in which the slot number increases, one end of a first fourth U-shaped hairpin is connected to the other end of the fourth third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the eighth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the eighth slot layer by crossing z / P slot positions in a direction in which the slot number increases, From the eighth slot layer, a fifth third U-shaped hairpin and a sixth third U-shaped hairpin are respectively obtained by rotating the fourth third U-shaped hairpin and the third third U-shaped hairpin by z / P-1 slot positions in a direction in which the slot number increases, one end of the fifth third U-shaped hairpin is connected to the other end of the first fourth U-shaped hairpin, the other end of the fifth third U-shaped hairpin is connected to one end of the sixth third U-shaped hairpin, to form a first coil winding, and all the stator slots are wound in the same manner, The winding mode of the third branch of the U phase of the stator winding is as follows: From the fifth slot layer, one end of the first third U-shaped hairpin is arranged in the fifth slot layer, the other end of the first third U-shaped hairpin is arranged in the fourth slot layer by crossing x slot positions in a direction in which the slot number decreases, one end of a second third U-shaped hairpin is connected to the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the third slot layer, the other end of the second third U-shaped hairpin is arranged in the second slot layer by crossing x slot positions in a direction in which the slot number decreases, one end of a first first U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer by crossing z / P-1 slot positions in a direction in which the slot number decreases, From the first slot layer, a third one of the third U-shaped hairpins and a fourth one of the third U-shaped hairpins are respectively rotated by z / P-1 slot positions in a direction of decreasing slot number from a second one of the third U-shaped hairpins and a first one of the third U-shaped hairpins, wherein one end of the first one of the first U-shaped hairpins is connected to one end of the third one of the third U-shaped hairpins, one end of the fourth one of the third U-shaped hairpins is connected to the other end of the third one of the third U-shaped hairpins, one end of a fifth one of the third U-shaped hairpins is connected to the other end of the fourth one of the third U-shaped hairpins, the one end of the fifth one of the third U-shaped hairpins is arranged in the sixth slot layer, the other end of the fifth one of the third U-shaped hairpins is arranged in the seventh slot layer by crossing z / P-1 slot positions in a direction of increasing slot number, one end of a first one of the fourth U-shaped hairpins is arranged in the eighth slot layer, and the other end of the first one of the fourth U-shaped hairpins is arranged in the eighth slot layer by crossing z / P slot positions in a direction of increasing slot number, From the eighth slot layer, a sixth one of the third U-shaped hairpins is obtained by rotating the fifth one of the third U-shaped hairpins by z / P-1 slot positions in a direction of increasing slot number, one end of the sixth one of the third U-shaped hairpins is connected to the other end of the first one of the fourth U-shaped hairpins to form a first round of winding, and winding is performed in the same manner to all the stator slots, In the second round of winding of the first branch, the second branch, and the third branch, one end of a second one of the first U-shaped hairpins is arranged in the first slot layer, and the other end of the second one of the first U-shaped hairpins is arranged in the first slot layer by crossing z / P-1 slot positions in a direction of decreasing slot number, in the third round of winding of the first branch, the second branch, and the third branch, one end of a first one of the second U-shaped hairpins is arranged in the first slot layer, the other end of the first one of the second U-shaped hairpins is arranged in the first slot layer by crossing z / P+(number of slots per pole per phase-1) slot positions in a direction of decreasing slot number, and x The winding methods of the U phase, the V phase, and the W phase are the same, the winding method of the V phase winding is obtained by rotating the U phase winding by 3 slot positions in a direction of increasing slot number or in a direction of decreasing slot number, and the winding method of the W phase winding is obtained by rotating the U phase winding by 6 slot positions in a direction of increasing slot number or in a direction of decreasing slot number.

9. The stator assembly of claim 5, wherein, z=72, m=3, P=6, each of the 72 stator slots has 6 slot layers, which are sequentially arranged in a radial direction of the stator core as a first slot layer, a second slot layer, a third slot layer, a fourth slot layer, a fifth slot layer, and a sixth slot layer, and the 3 phases include a U phase, a V phase, and a W phase, The winding method of a first branch of the U phase of the stator winding is as follows: From the first slot layer, one end of a first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by z / P-1 slot positions, one end of a first third U-shaped hairpin is connected with the other end of the first first U-shaped hairpin, one end of the first third U-shaped hairpin is arranged in the second slot layer, the other end of the first third U-shaped hairpin is arranged in the third slot layer in the direction of increasing slot number by x slot positions, one end of a second third U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the fourth slot layer, the other end of the second third U-shaped hairpin is arranged in the fifth slot layer in the direction of increasing slot number by x slot positions, one end of a first fourth U-shaped hairpin is connected with the other end of the second third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer in the direction of increasing slot number by z / P slot positions, From the sixth slot layer again, a third third U-shaped hairpin and a fourth third U-shaped hairpin are respectively rotated by z / P-1 slot positions in the direction of increasing slot number from the second third U-shaped hairpin and the first third U-shaped hairpin, wherein the other end of the first fourth U-shaped hairpin is connected with one end of the third third U-shaped hairpin, the other end of the third third U-shaped hairpin is connected with one end of the fourth third U-shaped hairpin, to form a first coil winding, and the winding is performed to all the stator slots in the same manner, The winding mode of a second branch of a U phase of the stator winding is as follows: From the third slot layer, one end of a first third U-shaped hairpin is arranged in the third slot layer, the other end of the first third U-shaped hairpin is arranged in the second slot layer in the direction of decreasing slot number by x slot positions, one end of a first first U-shaped hairpin is connected with the other end of the first third U-shaped hairpin, one end of the first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer in the direction of decreasing slot number by z / P-1 slot positions, From the first slot layer, a second third U-shaped hairpin is obtained by rotating the first third U-shaped hairpin by z / P-1 slot positions in the direction of decreasing slot number, one end of the second third U-shaped hairpin is connected to the other end of the first first U-shaped hairpin, one end of a third third U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the third third U-shaped hairpin is arranged in the fourth slot layer, the other end of the third third U-shaped hairpin is arranged in the fifth slot layer by crossing x slot positions in the direction of increasing slot number, one end of a first fourth U-shaped hairpin is connected to the other end of the third third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer by crossing z / P slot positions in the direction of increasing slot number, From the sixth slot layer, a fourth third U-shaped hairpin is obtained by rotating the third third U-shaped hairpin by z / P-1 slot positions in the direction of increasing slot number, one end of the fourth third U-shaped hairpin is connected to the other end of the first fourth U-shaped hairpin, to form a first round of winding, and the winding is performed in the same manner to all the stator slots, The winding mode of the U-phase third branch of the stator winding is as follows: From the fifth slot layer, one end of the first third U-shaped hairpin is arranged in the fifth slot layer, the other end of the first third U-shaped hairpin is arranged in the fourth slot layer by crossing x slot positions in the direction of decreasing slot number, one end of a second third U-shaped hairpin is connected to the other end of the first third U-shaped hairpin, one end of the second third U-shaped hairpin is arranged in the third slot layer, the other end of the second third U-shaped hairpin is arranged in the second slot layer by crossing x slot positions in the direction of decreasing slot number, one end of a first first U-shaped hairpin is connected to the other end of the second third U-shaped hairpin, one end of the first first U-shaped hairpin is arranged in the first slot layer, the other end of the first first U-shaped hairpin is arranged in the first slot layer by crossing z / P-1 slot positions in the direction of decreasing slot number, From the first slot layer, a third third U-shaped hairpin and a fourth third U-shaped hairpin are respectively obtained by rotating the second third U-shaped hairpin and the first third U-shaped hairpin by z / P-1 slot positions in the direction of decreasing slot number, wherein the other end of the first first U-shaped hairpin is connected to one end of the third third U-shaped hairpin, the other end of the third third U-shaped hairpin is connected to one end of the fourth third U-shaped hairpin, one end of a first fourth U-shaped hairpin is connected to the other end of the fourth third U-shaped hairpin, one end of the first fourth U-shaped hairpin is arranged in the sixth slot layer, the other end of the first fourth U-shaped hairpin is arranged in the sixth slot layer by crossing z / P slot positions in the direction of increasing slot number, to form a first round of winding, and the winding is performed in the same manner to all the stator slots, In the second and third turns of the first, second and third branches, one end of the second first U-shaped hairpin and one end of the third first U-shaped hairpin are both arranged in the first slot layer, and the other end of the second first U-shaped hairpin and the other end of the third first U-shaped hairpin are both arranged in the first slot layer by crossing z / P-1 slot positions in the direction of decreasing slot number, in the fourth turns of the first, second and third branches, one end of the first second U-shaped hairpin is arranged in the first slot layer, and the other end of the first second U-shaped hairpin is arranged in the first slot layer by crossing z / P+(the number of slots per pole per phase-1) slot positions in the direction of decreasing slot number, and x The winding methods of the U-phase, V-phase and W-phase are the same, the winding method of the V-phase winding is obtained by rotating the U-phase winding 4 slot positions in the direction of increasing slot number or in the direction of decreasing slot number, and the winding method of the W-phase winding is obtained by rotating the U-phase winding 8 slot positions in the direction of increasing slot number or in the direction of decreasing slot number.

10. The stator assembly of claim 1, wherein, M≥8。 11. The stator assembly of claim 1, wherein, Each phase includes m parallel branches, each of the m branches has a first connection end and a second connection end, and the stator assembly includes: A neutral point copper plate, the neutral point copper plate includes a connecting portion and m branch portions, the connecting portion extends in the circumferential direction of the stator core, and the m branch portions are arranged at intervals along the length direction of the connecting portion, each of the m branch portions is connected to the m first connection ends of each phase; An outgoing structure, the outgoing structure is m, each of the outgoing structures is connected to the m second connection ends of each phase, and the outgoing structure and the neutral point copper plate are arranged on the same side of the stator core in the axial direction.

12. The stator assembly of claim 11, wherein, The first connection ends of the m branches are led out from the same stator slot.

13. The stator assembly of claim 11, wherein, m=3, the three phases include a U-phase, a V-phase and a W-phase, each branch of the U-phase is located in a plurality of continuous stator slots, each branch of the V-phase is located in a plurality of continuous stator slots, each branch of the W-phase is located in a plurality of continuous stator slots, and the plurality of stator slots corresponding to the branches of the U-phase, V-phase and W-phase are arranged continuously.

14. The stator assembly of claim 11, wherein, The outgoing structure is a one-piece.

15. An electric machine characterized by The stator assembly according to any one of claims 1-14.

16. A vehicle characterized by comprising: The motor according to claim 15. The motor according to claim 15.

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