Stator assembly and motor

Abstract

The invention discloses a stator assembly and a motor. The stator assembly comprises a stator core and a multi-branch square conductor winding. An even number of stator slots are arranged on the inner circumference of the stator core, and each stator slot is divided into a plurality of layers for accommodating square conductors. The multi-branch square conductor winding is arranged in the stator slot, and the multi-branch square conductor winding comprises B parallel branches, where B is an integer multiple of 4. The number of slots per pole and per phase of the stator assembly Q is an odd number, and the following relationship is satisfied between Q and B: (Q+1)*2 / B and (Q‑1)*2 / B are both integers. In the stator assembly of the invention, a special winding connection design is used so that there is no magnetic field phase difference between the parallel branches, and each parallel branch passes through each layer in the stator slot equally, thereby fundamentally suppressing the generation of circulating currents between the parallel branches, suppressing harmonics, and improving the efficiency of the motor.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a stator assembly and a motor. Background Art

[0002] Square conductor motors have advantages such as high stator slot fill rate and large heat dissipation contact area, and are gradually becoming an important development direction for high power density motors. However, since the number of conductors in each slot of square conductor motors is relatively small, these conductors each occupy different positions in the stator slots, and the magnetic circuit characteristics of their positions are different. In the design process of square conductor motor windings, for certain specific pole-slot matching structures, it is difficult to design a multi-branch solution with completely consistent magnetic circuit structures in each branch. This will cause a phase difference in the magnetic field between the branches, which will lead to circulating currents between the branches, introduce harmonics, and affect the efficiency and noise performance of the motor.

[0003] Existing square conductor motor solutions usually choose a smaller number of parallel branches, for example: 2 branches in parallel or 1 in series, although it is relatively easy to design a structure without circulating current between branches, and the manufacturing process is not complicated. However, due to the continuous improvement of people's requirements for motor performance, when the motor needs to use more parallel branches, it is impossible to design a winding structure without circulating current. Summary of the invention

[0004] In view of the above problems, the present invention discloses a stator assembly and a motor to overcome the above problems or at least partially solve the above problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In one aspect, the present invention discloses a stator assembly, the stator assembly comprising a stator core and a multi-branch square conductor winding, an even number of stator slots are arranged on the inner circumference of the stator core, and each of the stator slots is divided into a plurality of layers for accommodating square conductors;

[0007] The multi-branch conductor winding is arranged in the stator slot, and the multi-branch conductor winding includes B parallel branches, where B is an integer multiple of 4;

[0008] The number of slots per pole and per phase of the stator assembly, Q, is an odd number, and the following relationship is satisfied between Q and B: (Q+1)*2 / B and (Q-1)*2 / B are both integers, and each of the parallel branches passes through each layer in the stator slot equally, so that there is no magnetic field phase difference between the parallel branches.

[0009] Furthermore, the stator core is evenly divided into two regions according to the number of the stator slots, and in each region, the arrangement of each parallel branch in the stator slot is different.

[0010] Further, the stator slots are numbered from 1 to S in a clockwise or counterclockwise direction, wherein slots No. 1 to S / 2 are defined as a first region, and slots No. S / 2+1 to S are defined as a second region;

[0011] The parallel branches are numbered in sequence, namely odd-numbered and even-numbered;

[0012] When the parallel branches are arranged in the stator slots, the odd-numbered parallel branches appear (Q+1)*2 / B times under each pair of magnetic poles and in each layer in the first region, and appear (Q-1)*2 / B times under each pair of magnetic poles and in each layer in the second region; the even-numbered parallel branches appear (Q-1)*2 / B times under each pair of magnetic poles and in each layer in the first region, and appear (Q+1)*2 / B times under each pair of magnetic poles and in each layer in the second region.

[0013] Furthermore, the parallel branch is composed of a first type of square conductor coil or a first type of square conductor coil and a second type of square conductor coil, the first type of square conductor coil includes an in-slot portion, a cross-line portion and a welding portion, the in-slot portion includes a first straight line segment and a second straight line segment; the second type of square conductor coil includes an in-slot portion, a lead terminal portion and a welding portion.

[0014] Further, the welding parts of each of the first-type square conductor coils and each of the second-type square conductor coils have the same bending structure; or,

[0015] The cross-line parts of each of the first-type square conductor coils have the same bending structure.

[0016] Further, the lead wire of the stator assembly is located at one end where the cross-wire portion is located, and each of the parallel branches includes a plurality of the first-type square conductor coils and two second-type square conductor coils; or,

[0017] The lead wire of the stator assembly is located at one end where the welding part is located, and each of the parallel branches only includes a plurality of the first-type square conductor coils.

[0018] Furthermore, the heads of the parallel branches are connected to each other, and the tails are connected to each other to form UVW three-phase windings respectively, and the three-phase windings are connected by star connection or triangle connection.

[0019] Furthermore, the U-phase winding in the three-phase winding is obtained by rotating the first parallel branch clockwise or counterclockwise through several positioning grooves; and the V-phase winding and the W-phase winding are obtained by rotating the U-phase winding clockwise or counterclockwise through the same multiple positioning grooves.

[0020] Another aspect of the present invention discloses a motor, comprising the stator assembly as described in any one of the above items and a rotor, wherein the rotor is coaxially arranged inside the stator assembly.

[0021] The advantages and beneficial effects of the present invention are:

[0022] In the stator assembly of the present invention, there is no magnetic field phase difference between the parallel branches, and each parallel branch passes through each layer in the stator slot equally, which fundamentally suppresses the generation of circulating currents between parallel branches, suppresses harmonics, and improves the efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0024] Figure 1 is a radial cross-sectional view of a stator assembly in one embodiment of the present invention;

[0025] Figure 2 A structural diagram of a first type square conductor coil in one embodiment of the present invention;

[0026] Figure 3 is a structural diagram of a second type square conductor coil in one embodiment of the present invention;

[0027] Figure 4 It is a schematic diagram of the arrangement of the parallel branches of the U-phase square conductor in the slot in one embodiment of the present invention;

[0028] Figure 5 A schematic diagram of winding connection of the first parallel branch of the U phase in one embodiment of the present invention;

[0029] Figure 6 The figure is a schematic diagram of the winding connection of the first parallel branch of the U phase in one embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] When designing stator square conductor windings, to obtain a winding structure without circulating current, each branch needs to have Q*2 / B conductors under each pair of poles and at each layer. For example, for an 8-pole, 72-slot, 4-branch motor, the number of poles P=8, the number of stator slots S=72, the number of slots per pole per phase Q=72 / 8 / 3=3, Q*2 / B=1.5. It can be seen that this value is not necessarily an integer, but the square conductor must appear in an integer number. Therefore, for this type of motor, there is currently no perfect design for square conductor windings without circulating current.

[0032] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0033] The present invention first discloses a stator assembly, such as Figure 1 As shown, the stator assembly includes a stator core 1 and a multi-branch square conductor winding 3. An even number of axially penetrating stator slots are evenly arranged on the inner circumference of the stator core 1. The stator slots are radially open inward, one end of the stator core slot is an insertion side, and the other end is a connection side; each stator slot is divided into a plurality of layers for accommodating square conductors, so that the square conductors are conveniently stacked in the stator slots, and each stator slot is preferably divided into 6 or 8 layers.

[0034] The multi-branch conductor winding 3 is arranged in the stator slots, and the multi-branch conductor winding 3 includes B parallel branches, where B is an integer multiple of 4, for example: 4 parallel branches or 8 parallel branches.

[0035] The number of slots per pole and per phase of the stator assembly, Q, is an odd number, and the relationship between Q and B is as follows: (Q+1)*2 / B and (Q-1)*2 / B are both integers, so that an integer number of square conductors appear under each pair of magnetic poles and at each layer in each branch, and each parallel branch passes through each layer in the stator slot equally, so that there is no magnetic field phase difference between the parallel branches.

[0036] In summary, in the stator assembly of this embodiment, there is no magnetic field phase difference between the parallel branches, and each parallel branch passes through each layer in the stator slot equally, which fundamentally suppresses the generation of circulating currents between parallel branches, suppresses harmonics, and improves the efficiency of the motor.

[0037] In a preferred embodiment, Figure 1 As shown, the stator core 1 is evenly divided into two areas according to the number of stator slots, and in each area, the arrangement of each parallel branch in the stator slot is different. When the windings in the stator slots of each area are connected together, there is no magnetic field phase difference between the parallel branches, and thus no circulating current occurs between the parallel branches.

[0038] Specifically, the stator slots are numbered 1 to S in a clockwise or counterclockwise direction, wherein slots No. 1 to S / 2 are defined as the first region 1-1, and slots No. S / 2+1 to S are defined as the second region 1-2; for example: when the number of stator slots is 72, the stator slots are numbered 1 to 72 in a clockwise or counterclockwise direction, wherein stator slots No. 1 to 36 are defined as the first region 1-1, and stator slots No. 37 to 72 are defined as the second region 1-2.

[0039] The parallel branches are numbered in sequence, namely odd numbers and even numbers.

[0040] When the parallel branches are arranged in the stator slots, the odd-numbered parallel branches appear (Q+1)*2 / B times at each pair of poles and each layer in the first region 1-1, and appear (Q-1)*2 / B times at each pair of poles and each layer in the second region 1-2; the even-numbered parallel branches appear (Q-1)*2 / B times at each pair of poles and each layer in the first region 1-1, and appear (Q+1)*2 / B times at each pair of poles and each layer in the second region 1-2. This setting makes the arrangement of the parallel branches in the two regions different, so that there is no magnetic field phase difference between the parallel branches, and the generation of circulating currents between the parallel branches is suppressed.

[0041] In one embodiment, if Figure 2-3 As shown, the parallel branch is composed of a first-type square conductor coil 5 or a first-type square conductor coil 5 and a second-type square conductor coil 6; when the square conductor coil includes two straight line segments, and the two straight line segments are respectively located in two adjacent layers of two different stator slots, the square conductor coil is a first-type square conductor coil 5; when the square conductor coil includes a straight line segment, the square conductor coil is a second-type square conductor coil 6. The first-type square conductor coil 5 includes a slot portion 5-1, a cross-line portion 5-2, and a welding portion 5-3, and the slot portion 5-1 includes a first straight line segment and a second straight line segment; the second-type square conductor coil 6 includes a slot portion 6-1, a lead-out terminal portion 6-2, and a welding portion 6-3.

[0042] Among them, the slot part 5-1 is located in the stator slot; the function of the cross-line part 5-2 is to connect the two straight sections of the slot part 5-1 of the same first-type square conductor coil 5 together; the function of the welding part 5-3 is to connect two different square conductor coils by welding; the function of the lead-out terminal part 6-2 is to serve as a lead-out terminal to connect the straight section of the slot part 6-1 of the second-type square conductor coil 6 with the lead-out wire.

[0043] In a preferred embodiment, the welding portions 5 - 3 of each first-type square conductor coil 5 and each second-type square conductor coil 6 have the same bending structure, which greatly reduces the difficulty of end shaping after the square conductor coil is inserted into the stator slot, and facilitates the assembly and processing of the stator assembly.

[0044] In one embodiment, the cross-line portions 5 - 2 of each first-type square conductor coil 5 have the same bending structure, that is, there is only one line type, which makes the manufacturing mold simpler.

[0045] In one embodiment, the lead wire of the stator assembly is located at one end where the cross-line portion 5-2 is located, and each parallel branch includes a plurality of first-type square conductor coils 5 and two second-type square conductor coils 6. Specifically, each parallel branch includes S*P / B / 3 / 2-1 first-type square conductor coil 5 and two second-type square conductor coils 6.

[0046] In one embodiment, the lead wire of the stator assembly is located at the end where the welding portion 5-3 is located, and each parallel branch includes only multiple first-type square conductor coils 5, specifically: each parallel branch includes only S*P / B / 3 / 2 first-type square conductor coils 5, and does not include second-type square conductor coils 6.

[0047] Among them, S is the number of stator slots, P is the number of poles, and B is the number of parallel branches.

[0048] In one embodiment, the heads of the parallel branches are connected to each other, and the tails are connected to each other to form UVW three-phase windings, respectively, and the three-phase windings are connected by star connection or triangle connection. Among them, the star connection refers to connecting the three-phase ends of the motor winding together, and the three-phase head end is the power supply end, which is connected to the controller; the triangle connection refers to connecting the three-phase winding head and tail to each other, and the three end points are the power supply end, which is connected to the controller.

[0049] In one embodiment, the U-phase winding in the three-phase winding is a subsequent parallel branch obtained by rotating the first parallel branch clockwise or counterclockwise through several positioning grooves; and the V-phase winding and the W-phase winding are obtained by rotating the U-phase winding clockwise or counterclockwise through the same multiple positioning grooves, respectively.

[0050] The present invention further discloses a motor, which comprises the stator assembly of any one of the above embodiments and a rotor, wherein the rotor is coaxially arranged inside the stator assembly.

[0051] The motor in this embodiment does not have circulating current between different branches, and has high energy conversion efficiency.

[0052] In order to illustrate the above implementation in detail, the following two specific examples are given.

[0053] Example 1

[0054] This embodiment discloses a motor, which uses the above-mentioned stator assembly. Figure 1 There are 72 stator slots on the stator core 1, which are numbered 2-1, 2-2...2-72 respectively. Eight layers of multi-branch square conductor windings 3 are arranged in each slot. The layer closest to the rotor is defined as the first layer, and so on. The layer closest to the inside of the stator slot is the eighth layer.

[0055] The multi-branch square conductor winding 3 is connected by a star connection or a triangle connection, and the U-phase winding 3-1, the V-phase winding 3-2, and the W-phase winding 3-3 of the motor each include 4 parallel branches. Among them, in the parallel branch of the U-phase winding 3-1, the U-phase first branch 4-1, the U-phase second branch 4-2, the U-phase third branch 4-3, and the U-phase fourth branch 4-4 are each composed of 23 first-type square conductor coils 5, 2 second-type square conductor coils 6, and lead wires. The composition of the V-phase winding 3-2 and the W-phase winding 3-3 is the same as that of the U-phase winding 3-1, that is, the multi-branch square conductor winding 3 is composed of 276 first-type square conductor coils 5, 24 second-type square conductor coils 6, and a number of lead wires.

[0056] Among them, Figure 2 As shown, each first-type square conductor coil 5 consists of three parts, namely, the slot part 5-1, the cross-line part 5-2 and the welding part 5-3. The slot part 5-1 includes a first straight line segment 5-1-1 and a second straight line segment 5-1-2, which are respectively located in two adjacent layers in two different slots. The function of the cross-line part 5-2 is to connect the first straight line segment 5-1-1 and the second straight line segment 5-1-2 together. The welding part 5-3 is used to connect two different square conductor coils by welding. In addition, as shown in FIG. Figure 3 As shown, each second type square conductor coil 6 is also composed of three parts, namely, the slot part 6-1, the lead wire terminal part 6-2 and the welding part 6-3. The slot part 6-1 only includes a straight line segment. The lead wire terminal part 6-2 serves as a lead wire terminal to connect the slot part 6-1 and the lead wire together. The welding part 6-3 is used to connect two different square conductor coils by welding.

[0057] Specifically, the arrangement structure of the multi-branch conductor winding 3 without circulating current in this embodiment is as follows: Figure 1 As shown, the stator slots of the motor are first numbered from 1 to 72 in clockwise order, and the slots from No. 1 to No. 36 are defined as a first region 1-1, and the slots from No. 37 to No. 72 are defined as a second region 1-2, and the multi-branch conductor winding 3 is arranged differently in the first region 1-1 and the second region 1-2. Figure 4As shown, in the first area 1-1, the slot part 5-1 or 6-1 of the square conductor coil 5 or 6 in the U-phase first branch 4-1 is placed in the first layer of slots 2-1, slots 2-3, slots 2-19, and slots 2-21, the second layer of slots 2-10, slots 2-12, slots 2-28, and slots 2-30, the third layer of slots 2-2 and slots 2-20, the fourth layer of slots 2-11 and slots 2-29, the fifth layer of slots 2-2, slots 2-4, slots 2-20, and slots 2-22, the sixth layer of slots 2-11, slots 2-13, slots 2-29, and slots 2-31, the seventh layer of slots 2-3 and slots 2-21, and the eighth layer of slots 2-12 and slots 2-30. In the second area 1-2, the slot part 5-1 or 6-1 of the square conductor coil 5 or 6 in the U-phase first branch 4-1 is placed in the first layer of slots 2-38 and slots 2-56, the second layer of slots 2-47 and slots 2-65, the third layer of slots 2-37, slots 2-39, slots 2-55 and slots 2-57, the fourth layer of slots 2-46, slots 2-48, slots 2-64 and slots 2-66, the fifth layer of slots 2-39 and slots 2-57, the sixth layer of slots 2-48 and slots 2-66, the seventh layer of slots 2-38, slots 2-40, slots 2-56 and slots 2-58, and the eighth layer of slots 2-47, slots 2-49, slots 2-65 and slots 2-67. Figure 5 The winding connection diagram of the first U-phase branch 4-1 is given, and the lead wire is located at the end where the cross-line part 5-2 or 6-2 is located. The setting structure of the second U-phase branch 4-2, the third U-phase branch 4-3 and the fourth U-phase branch 4-4 can be obtained by rotating a certain number of slots in the following way.

[0058] The position of the slot portion 5-1 or 6-1 of the square conductor coil 5 or 6 in the second branch 4-2 of the U phase is obtained by rotating 36 slots clockwise on the basis of the first branch 4-1 of the U phase. Figure 4As shown, in the first area 1-1, the slot in-slot portion 5-1 or 6-1 of the square conductor coil 5 or 6 is placed in the first layer of slots 2-2 and slots 2-20, the second layer of slots 2-11 and slots 2-29, the third layer of slots 2-1, slots 2-3, slots 2-19 and slots 2-21, the fourth layer of slots 2-10, slots 2-12, slots 2-28 and slots 2-30, the fifth layer of slots 2-3 and slots 2-21, the sixth layer of slots 2-12 and slots 2-30, the seventh layer of slots 2-2, slots 2-4, slots 2-20 and slots 2-22, and the eighth layer of slots 2-11, slots 2-13, slots 2-29 and slots 2-31. In the second area 1-2, the in-slot portion 5-1 or 6-1 of the square conductor coil 5 or 6 is placed in the first layer of the slots 2-37, slot 2-39, slot 2-55, and slot 2-57, the second layer of the slots 2-46, slot 2-48, slot 2-64, and slot 2-66, the third layer of the slots 2-38 and slot 2-56, the fourth layer of the slots 2-47 and slot 2-65, the fifth layer of the slots 2-38, slot 2-40, slot 2-56, and slot 2-58, the sixth layer of the slots 2-47, slot 2-49, slot 2-65, and slot 2-67, the seventh layer of the slots 2-39 and slot 2-57, and the eighth layer of the slots 2-48 and slot 2-66.

[0059] The position of the slot part 5-1 or 6-1 of the square conductor coil 5 or 6 in the U-phase third branch 4-3 is obtained by rotating 9 slots counterclockwise on the basis of the U-phase first branch 4-1. Therefore, the slot part 5-1 or 6-1 of the square conductor coil 5 or 6 in the U-phase third branch 4-3 will be placed in the first layer of slots 2-64, slot 2-66, slot 2-10, slot 2-12, slot 2-29, and slot 2-47, the second layer of slots 2-1, slot 2-3, slot 2-19, slot 2-21, slot 2-38, and slot 2-56, the third layer of slots 2-65, slot 2-11, slot 2-28, slot 2-30, slot 2-46, and slot 2-48, and the third layer of slots 2-2, slot 2-20, slot 2-37, and slot 2- 39, the fourth layer of slot 2-55, and slot 2-57, the fifth layer of slot 2-65, slot 2-67, slot 2-11, slot 2-13, slot 2-30, and slot 2-48, the sixth layer of slot 2-2, slot 2-4, slot 2-20, slot 2-22, slot 2-39, and slot 2-57, the seventh layer of slot 2-66, slot 2-12, slot 2-29, slot 2-31, slot 2-47, and slot 2-49, and the eighth layer of slot 2-3, slot 2-21, slot 2-38, slot 2-40, slot 2-56, and slot 2-58.

[0060] The position of the slot part 5-1 or 6-1 of the square conductor coil 5 or 6 in the fourth branch 4-4 of the U phase is obtained by rotating 9 slots counterclockwise on the basis of the second branch 4-2 of the U phase. The slot part 5-1 or 6-1 of the square conductor coil 5 or 6 in the fourth branch 4-4 of the U phase is placed in the first layer of slots 2-65, slot 2-11, slot 2-28, slot 2-30, slot 2-46, and slot 2-48, the second layer of slots 2-2, slot 2-20, slot 2-37, slot 2-39, slot 2-55, and slot 2-57, the third layer of slots 2-64, slot 2-66, slot 2-10, slot 2-12, slot 2-29, and slot 2-47, and the third layer of slots 2-1, slot 2-3, slot 2-19, and slot 221. , slot 2-38, slot 2-56 of the fourth layer, slot 2-66, slot 2-12, slot 2-29, slot 2-31, slot 2-47, slot 2-49 of the fifth layer, slot 2-3, slot 2-21, slot 2-38, slot 2-40, slot 2-56, slot 2-58 of the sixth layer, slot 2-65, slot 2-67, slot 2-11, slot 2-13, slot 2-30, slot 2-48 of the seventh layer, and slot 2-2, slot 2-4, slot 2-20, slot 2-22, slot 2-39, slot 2-57 of the eighth layer.

[0061] Use Figure 4 The structure of the winding slot portion 5-1 or 6-1 shown can make the number of conductors of each branch 4-1, 4-2, 4-3, and 4-4 of the U-phase winding 3-1 the same in each stator slot. For example, in slot 2-1, there is 1 U-phase first branch 4-1, 1 U-phase second branch 4-2, 1 U-phase third branch 4-3, and 1 U-phase fourth branch 4-4. For another example, in slot 2-2, there are 2 U-phase first branch 4-1, 2 U-phase second branch 4-2, 2 U-phase third branch 4-3, and 2 U-phase fourth branch 4-4. In addition, in each layer of all 72 slots, the number of conductors of each branch 4-1, 4-2, 4-3, and 4-4 of the U-phase winding is also the same. For example, in the first layer, the first branch 4-1 of the U phase has 6 wires, the second branch 4-2 of the U phase has 6 wires, the third branch 4-3 of the U phase has 6 wires, and the fourth branch 4-4 of the U phase has 6 wires. This completely symmetrical winding structure can eliminate the circulating current caused by the phase difference of the magnetic field between different branches, and effectively improve the efficiency and noise quality of the motor.

[0062] Each branch 4-1, 4-2, 4-3, and 4-4 of the U-phase winding 3-1 is connected head to head and tail to tail to form the U-phase winding 3-1. In addition, for the V-phase winding 3-2, its setting structure is obtained by rotating the U-phase winding 3-1 clockwise by 6 slots; for the W-phase winding 3-3, its setting structure is obtained by rotating the U-phase winding 3-1 counterclockwise by 6 slots. The details are not described in detail here. The three-phase windings are connected in a star or triangle shape to eventually form a complete set of square conductor windings 3 of the motor. The advantage of this structure is that the bending structure of the conductors of the welding parts 5-3 or 6-3 of all the square conductor coils 5 or 6 is completely consistent, which can reduce the difficulty of shaping the conductor ends after the square conductor is inserted into the stator core.

[0063] Example 2

[0064] This embodiment discloses a motor, which uses the above-mentioned stator assembly. Figure 1 , Figure 2 , Figure 4 As shown, the arrangement position of the slot part 5-1 of each branch coil is exactly the same as that in the first embodiment.

[0065] The difference between the present embodiment 2 and the embodiment 1 is that, taking the U-phase winding 3-1 as an example, each of its parallel branches 4-1, 4-2, 4-3, and 4-4 is composed of 24 first-type square conductor coils 5 and lead wires, and does not need the second-type square conductor coil 6. The composition of the V-phase winding 3-2 and the W-phase winding 3-3 is the same as that of the U-phase winding 3-1. Therefore, the multi-branch square conductor winding 3 is composed of 288 first-type square conductor coils 5 and a number of lead wires.

[0066] Among them, Figure 2 As shown, each first-type square conductor coil 5 consists of three parts, namely, the slot part 5-1, the cross-line part 5-2 and the welding part 5-3. The slot part 5-1 includes a first straight line segment 5-1-1 and a second straight line segment 5-1-2, which are respectively located in two adjacent layers in two slots with a span of 9. The function of the cross-line part 5-2 is to connect the first straight line segment 5-1-1 and the second straight line segment 5-1-2 together, and its span is 9 slots. The welding part 5-3 is used to connect two different square conductor coils by welding; in addition, there will also be a number of first-type coils 5 whose welding parts 5-3 function as lead-out terminals to connect their slot parts 5-1 and lead-out wires together.

[0067] Figure 6The winding connection diagram of the first branch 4-1 of the U phase is given, and the lead wire is located at the end where the welding part 5-3 is located. The advantage of this structure is that the bending structure of the cross-line part 5-2 of all the square conductor coils 5 is completely consistent, that is, there is only one line type, which makes the manufacturing mold simpler. Similarly, the position of the slot part 5-1 of the square conductor coil 5 in the second branch 4-2 of the U phase is obtained by rotating 36 slots clockwise on the basis of the first branch 4-1 of the U phase; the position of the slot part 5-1 of the square conductor coil 5 in the third branch 4-3 of the U phase is obtained by rotating 9 slots counterclockwise on the basis of the first branch 4-1 of the U phase; the position of the slot part 5-1 of the square conductor coil 5 in the fourth branch 4-4 of the U phase is obtained by rotating 9 slots counterclockwise on the basis of the second branch 4-2 of the U phase.

[0068] Each branch 4-1, 4-2, 4-3, and 4-4 of the U-phase winding 3-1 is connected head to head and tail to tail to form the U-phase winding 3-1. In addition, for the V-phase winding 3-2, its setting structure is obtained by rotating the U-phase winding 3-1 clockwise by 6 slots; for the W-phase winding 3-3, its setting structure is obtained by rotating the U-phase winding 3-1 counterclockwise by 6 slots. The three-phase windings are connected by star connection or triangle connection to finally form a complete set of multi-branch square conductor windings 3 of the motor.

[0069] The above is only a specific embodiment of the present invention. Under the above teachings of the present invention, those skilled in the art can make other improvements or modifications on the basis of the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of the present invention, and the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A stator assembly, characterized in that: The stator assembly comprises a stator core and a multi-branch square conductor winding, an even number of stator slots are arranged on the inner circumference of the stator core, and each of the stator slots is divided into a plurality of layers for accommodating square conductors; The multi-branch conductor winding is arranged in the stator slot, and the multi-branch conductor winding includes B parallel branches, where B is an integer multiple of 4; The number of slots per pole per phase of the stator assembly Q is an odd number, and the following relationship is satisfied between Q and B: (Q+1)*2 / B and (Q-1)*2 / B are both integers, and each of the parallel branches passes through each layer in the stator slot equally, so that there is no magnetic field phase difference between the parallel branches; The stator core is evenly divided into two regions according to the number of the stator slots, and in each region, the arrangement of each parallel branch in the stator slot is different; The stator slots are numbered 1 to S in a clockwise or counterclockwise direction, wherein slots 1 to S / 2 are defined as a first region, and slots S / 2+1 to S are defined as a second region; The parallel branches are numbered in sequence, namely odd-numbered and even-numbered; When the parallel branches are arranged in the stator slots, the odd-numbered parallel branches appear (Q+1)*2 / B times under each pair of magnetic poles and in each layer in the first region, and appear (Q-1)*2 / B times under each pair of magnetic poles and in each layer in the second region; the even-numbered parallel branches appear (Q-1)*2 / B times under each pair of magnetic poles and in each layer in the first region, and appear (Q+1)*2 / B times under each pair of magnetic poles and in each layer in the second region.

2. The stator assembly according to claim 1, characterized in that: The parallel branch is composed of a first-type square conductor coil or a first-type square conductor coil and a second-type square conductor coil; the first-type square conductor coil includes an in-slot portion, a cross-line portion and a welding portion, and the in-slot portion includes a first straight line segment and a second straight line segment; the second-type square conductor coil includes an in-slot portion, a lead-out terminal portion and a welding portion.

3. The stator assembly according to claim 2, characterized in that: The welding parts of each of the first-type square conductor coils and each of the second-type square conductor coils have the same bending structure; or, The cross-line parts of each of the first-type square conductor coils have the same bending structure.

4. The stator assembly according to claim 2, characterized in that: The lead wire of the stator assembly is located at one end where the cross-wire portion is located, and each of the parallel branches includes a plurality of the first-type square conductor coils and two second-type square conductor coils; or, The lead wire of the stator assembly is located at one end where the welding part is located, and each of the parallel branches only includes a plurality of the first-type square conductor coils.

5. The stator assembly according to any one of claims 1 to 4, characterized in that: The heads of the parallel branches are connected to each other, and the tails are connected to each other to form UVW three-phase windings respectively. The three-phase windings are connected by star connection or triangle connection.

6. The stator assembly according to claim 5, characterized in that The U-phase winding in the three-phase winding is connected in parallel with the first parallel branch by rotating the first parallel branch clockwise or counterclockwise through several positioning grooves; and the V-phase winding and the W-phase winding are connected by rotating the U-phase winding clockwise or counterclockwise through the same number of positioning grooves.

7. A motor, characterized in that: The motor comprises a stator assembly according to any one of claims 1 to 6 and a rotor, wherein the rotor is coaxially arranged inside the stator assembly.

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