Stator winding, stator assembly and motor

Abstract

The invention relates to a stator winding, a stator assembly and a motor, the stator winding comprises U, V and W three-phase winding circuits, the winding circuit of each phase comprises m first winding branches connected in parallel, and each first winding branch comprises n second winding branches connected in series; wherein the winding initial positions of the m first winding branches are arranged at equal intervals or non-equal intervals in the circumferential direction of the stator core, the winding initial positions and the winding final positions of the m * n second winding branches are alternately distributed in the circumferential direction of the stator core, and the winding initial positions of the m * n second winding branches are arranged at equal intervals in the circumferential direction of the stator core, and the winding final positions of the m * n second winding branches are arranged at equal intervals along the circumferential direction of the stator core. When the number of the stator winding is adjusted from a large number of parallel branches to a small number of branches, the second winding branches do not need to be redesigned, and only the series connection and parallel connection sequence of the second winding branches needs to be readjusted.

Description

Technical Field

[0001] The present application relates to the technical field of electromagnetic devices, and in particular to a stator winding, a stator assembly and a motor. Background Art

[0002] The motor includes a stator assembly, which includes a stator core and a stator winding wound on the stator core. The stator winding may include three-phase winding circuits so that the motor constitutes a three-phase motor. The winding circuit of each phase may include a plurality of parallel winding branches, such as a stator winding of three parallel 4 branches. For each winding branch, it may include a plurality of coils. The coil is made of a conductor, which is at least partially wound in a conductor slot of the stator core. According to the arrangement position of the coil in the conductor slot, the conductor slot can be divided into a plurality of slot layers. When the coil is arranged in different slot layers of the conductor slot and when the coil has different pitches, the plurality of coils form different line shapes, which determine the preparation process of the coil. At the same time, in the prior art, in order to meet the needs of different high and low voltage products, the same stator core is usually used for winding stator windings of multiple parallel branches. For example, a three-phase parallel stator winding with four branches is wound on the stator core and can be used for low voltage motor products; while a three-phase parallel stator winding with two branches is wound on the stator core and can be used for high voltage motor products. However, when the stator winding changes from a large number of parallel branches to a small number of branches, the stator winding often needs to redesign its winding branch, and correspondingly, the line type of several coils included in the winding branch will also change, which involves the re-preparation of the coil, resulting in a significant increase in the design difficulty and cost of the stator winding. Summary of the invention

[0003] Based on this, the present application provides a stator winding, a stator assembly and a motor to improve the problem in the prior art that when the stator winding changes from a larger number of parallel branches to a smaller number of branches, the line shape of the coil changes, and the difficulty and cost of winding the stator winding are greatly increased.

[0004] In a first aspect, the present application provides a stator winding, wherein the number of phases of the stator winding is three-phase and the number of poles is 2p, and the stator winding is applicable to a stator assembly, wherein the stator assembly further comprises a stator core, wherein the stator core is provided with Z conductor slots at equal intervals along the circumferential direction, and the stator winding is wound on the stator core, wherein the stator winding comprises a busbar assembly and winding circuits of three phases in total, namely, U, V and W, wherein the winding circuits of the V phase and the W phase are obtained by translating the winding circuit of the U phase by Z / 3p and 2Z / 3p conductor slots respectively along the circumferential direction of the stator core, wherein the winding circuit of each phase comprises m first winding branches connected in parallel, and each of the first winding branches comprises n second winding branches connected in series, and the second winding branch adopts a lap winding winding method and comprises at least one lap winding;

[0005] The winding starting positions of the m first winding branches are arranged at equal intervals or unequal intervals along the circumference of the stator core, the winding starting positions and winding ending positions of the m*n second winding branches are alternately distributed along the circumference of the stator core, and the winding starting positions of the m*n second winding branches are arranged at equal intervals along the circumference of the stator core, and the winding ending positions of the m*n second winding branches are arranged at equal intervals along the circumference of the stator core;

[0006] The busbar assemblies correspond to the three phases one by one, and the busbar assemblies are connected to the winding starting positions of the m first winding branches of the corresponding phases.

[0007] In one embodiment, the first winding branch includes an inlet wire, an outlet wire and a connecting coil, and the second winding branch includes a plurality of stacked coils;

[0008] Wherein, the lead-in wire is the winding starting position of the first winding circuit, and the lead-in wire includes an lead-in effective edge, an lead-in welding end, and an lead-in twist end. The lead-in effective edge is provided as one and is provided in the conductor slot, the lead-in welding end and the lead-in twist end are provided as one and are respectively provided at the two ends of the lead-in effective edge, and the lead-in welding end and the lead-in twist end are provided on the same side of the lead-in effective edge;

[0009] The lead-out wire is the winding end position of the first winding circuit, and the lead-out wire includes a lead-out effective edge, a lead-out welding end, and a lead-out twist end. The lead-out effective edge is provided as one and is provided in the conductor slot. The lead-out welding end and the lead-out twist end are both provided as one and are respectively provided at the two ends of the lead-out effective edge. The lead-out welding end and the lead-out twist end are provided on the same side of the lead-out effective edge.

[0010] The second winding branch is lap-wound with a plurality of lap-wound coils, the lap-wound coils comprising lap-wound effective edges, lap-wound welding ends and lap-wound twist ends, the lap-wound effective edges are provided in two and both are provided in the conductor slot, the lap-wound welding ends correspond to the lap-wound effective edges one by one, the two lap-wound welding ends are provided at the same end of the two lap-wound effective edges and are close to each other, the lap-wound twist end is provided in one and is connected to the other ends of the two lap-wound effective edges;

[0011] The connecting coil connects two continuous second winding branches, and the connecting coil includes a connecting effective edge, a connecting welding end and a connecting twist end. The connecting effective edges are set to two and are both set in the conductor slot. The connecting welding ends correspond to the connecting effective edges one by one. The two connecting welding ends are set at the same end of the two connecting effective edges and extend in the same direction. The connecting twist end is set to one and connects the other ends of the two connecting effective edges.

[0012] In one embodiment, the second winding branch includes at least two stacked windings, and the second winding branch also includes a reverse twist coil, which connects two consecutive stacked windings. The reverse twist coil includes a reverse twist effective edge, a reverse twist welding end and a reverse twist head end. The reverse twist effective edges are set to two and are both set in the conductor slot. The reverse twist welding ends correspond to the reverse twist effective edges one by one. The two reverse twist welding ends are set at the same end of the two reverse twist effective edges and extend in the same direction. The reverse twist head end is set to one and connects the other ends of the two reverse twist effective edges.

[0013] In one embodiment, Z=72, m=2, n=2, p=4, and the conductor slots are provided with 6 slot layers a, b, c, d, e and f in total;

[0014] The route of the first winding branch of the U phase is:

[0015] 1a-10b-2a-11b-3a-12b-3c-12d-2c-11d-1c-10d-1e-10f-2e-11f-3e-1 2f-21f-12e-20f-11e-19f-10e-19d-10c-20d-11c-21d-12c-21b-12a-20b-1 1a-19b-10a-19a-28b-20a-29b-21a-30b-21c-30d-20c-29d-19c-28d-19e-2 8f-20e-29f-21e-30f-39f-30e-38f-29e-37f-28e-37d-28c-38d-29c-39d-30c-39b-30a-38b-29a-37b-28a;

[0016] The route of the second first winding branch of the U phase is:

[0017] 37a-46b-38a-47b-39a-48b-39c-48d-38c-47d-37c-46d-37e-46f-38e-47f-39e-4 8f-57f-48e-56f-47e-55f-46e-55d-46c-56d-47c-57d-48c-57b-48a-56b-47a-55b -46a-55a-64b-56a-65b-57a-66b-57c-66d-56c-65d-55c-64d-55e-64f-56e-65f-5 7e-66f-3f-66e-2f-65e-1f-64e-1d-64c-2d-65c-3d-66c-3b-66a-2b-65a-1b-64a.

[0018] In one embodiment, Z=72, m=2, n=2, p=4, and the conductor slots are provided with 6 slot layers a, b, c, d, e and f in total;

[0019] The route of the first winding branch of the U phase is:

[0020] 1a-10b-2a-11b-3a-12b-3c-12d-2c-11d-1c-10d-1e-10f-2e-11f-3f-1 2f-21f-12e-20f-11e-19f-10e-19d-10c-20d-11c-21d-12c-21b-12a-20b-1 1a-19b-10a-37a-46b-38a-47b-39a-48b-39c-48d-38c-47d-37c-46d-37e-4 6f-38e-47f-39f-48f-57f-48e-56f-47e-55f-46e-55d-46c-56d-47c-57d-48c-57b-48a-56b-47a-55b-46a;

[0021] The route of the second first winding branch of the U phase is:

[0022] 19a-28b-20a-29b-21a-30b-21c-30d-20c-29d-19c-28d-19e-28f-20e-29f-21e-3 0f-39f-30e-38f-29e-37f-28e-37d-28c-38d-29c-39d-30c-39b-30a-38b-29a-37b -28a-55a-64b-56a-65b-57a-66b-57c-66d-56c-65d-55c-64d-55e-64f-56e-65f-5 7e-66f-3f-66e-2f-65e-1f-64e-1d-64c-2d-65c-3d-66c-3b-66a-2b-65a-1b-64a.

[0023] In one of the embodiments, the stator winding further includes a fixing member, which connects the three busbar assemblies into a whole.

[0024] In one of the embodiments, the busbar assembly includes a copper busbar and a busbar, the busbar corresponds one-to-one to m first winding branches, and the copper busbar connects the m busbars.

[0025] In one of the embodiments, the stator winding further includes a star point copper bar, which corresponds one-to-one to the first winding branches, and the star point copper bar is connected to the winding end positions of three corresponding first winding branches.

[0026] In a second aspect, the present application provides a stator assembly, which includes any stator winding provided in the present application.

[0027] In a third aspect, the present application provides a motor, comprising any one of the stator assemblies provided in the present application.

[0028] The present application distributes the winding start position and the winding end position of m*n second winding branches alternately along the circumference of the stator core, and sets the winding start position and the winding end position at equal intervals along the circumference of the stator core, then connects them in series appropriately, and then connects them into m first winding branches in parallel through a busbar assembly. The existing three-phase Z-slot stator winding with m*n second winding branches in parallel can be adjusted to a three-phase Z-slot stator winding with m first winding branches in parallel without basically changing the line shape of the coil. Therefore, when the stator winding is adjusted from a larger number of parallel branches to a smaller number of branches, the present application does not need to redesign its second winding branches, but only needs to re-adjust the series and parallel sequence of its second winding branches, which can effectively improve the problem of greatly increased design difficulty and cost involved in the adjustment process of the stator winding. At the same time, after the stator winding is adjusted, the present application can also reduce the span of its busbar assembly, thereby effectively improving the problem that the busbar assembly of the existing stator winding is large in size and easily fails due to vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a stator assembly to which the stator winding provided in Embodiment 1 of the present application is applicable;

[0030] Figure 2 A schematic diagram of a winding circuit of a U-phase of a stator winding is provided for an embodiment of the present application;

[0031] Figure 3 The winding circuit diagram of the existing stator winding U phase;

[0032] Figure 4 A schematic diagram of the structure of the lead-in wire or lead-out wire of the stator winding is provided for an embodiment of the present application;

[0033] Figure 5 A schematic structural diagram of a stacked coil of a stator winding is provided for an embodiment of the present application;

[0034] Figure 6 A schematic diagram of the structure of a connection coil of a stator winding is provided for an embodiment of the present application;

[0035] Figure 7 A schematic structural diagram of a reverse twisted coil of a stator winding is provided for an embodiment of the present application;

[0036] Figure 8 A schematic diagram of winding circuits of three phases of a stator winding is provided for an embodiment of the present application;

[0037] Fig. 9 A schematic diagram of a winding circuit of a U-phase of a stator winding is provided for an embodiment of the present application.

[0038] : Figure numerals: 100, stator core; 110, conductor slot; 200, busbar assembly; 210, copper bar; 220, bus; 310, lead-in wire; 311, lead-in effective edge; 312, lead-in welding end; 313, lead-in twist end; 320, lead-out wire; 321, lead-out effective edge; 322, lead-out welding end; 323, lead-out twist end; 330, connecting coil; 331, connecting effective edge; 332, connecting welding end; 333, connecting twist end; 340, lap-wound coil; 341, lap-wound effective edge; 342, lap-wound welding end; 343, lap-wound twist end; 350, reverse twist coil; 351, reverse twist effective edge; 352, reverse twist welding end; 353, reverse twist twist end; 400, fixing piece; 500, star point copper bar. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0040] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention.

[0041] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0042] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0043] Embodiment 1

[0044] Embodiment 1 of the present application provides a stator winding, wherein the number of phases of the stator winding is three-phase, the number of poles is 2p, the stator winding is applicable to a stator assembly, the stator assembly further comprises a stator core 100, the stator core 100 is provided with Z conductor slots 110 at equal intervals along the circumferential direction, the stator winding is wound on the stator core 100, the stator winding comprises a busbar assembly 200 and winding circuits of three phases in total, namely, U, V and W, the winding circuits of the V phase and the W phase are obtained by translating the winding circuit of the U phase by Z / 3p and 2Z / 3p conductor slots 110 respectively along the circumferential direction of the stator core 100, the winding circuit of each phase comprises m first winding branches connected in parallel, each first winding branch comprises n second winding branches connected in series, the second winding branch adopts a lap winding winding method, and comprises at least one lap winding;

[0045] The winding starting positions of the m first winding branches are arranged at equal intervals or unequal intervals along the circumference of the stator core 100, the winding starting positions and winding ending positions of the m*n second winding branches are alternately distributed along the circumference of the stator core 100, and the winding starting positions of the m*n second winding branches are arranged at equal intervals along the circumference of the stator core 100, and the winding ending positions of the m*n second winding branches are arranged at equal intervals along the circumference of the stator core 100;

[0046] The busbar assemblies 200 correspond to the three phases one by one, and the busbar assemblies 200 are connected to the winding start positions of the m first winding branches of the corresponding phases.

[0047] like Figure 1 and Figure 2As shown, in this embodiment, it is exemplarily explained that the stator assembly includes a stator core 100 and a stator winding. The stator core 100 can be formed by stacking a number of punching sheets, and its shape is a hollow cylinder. A conductor slot 110 can be provided on the inner side of the stator core 100, and the conductor slots 110 can be arranged at equal intervals along the circumference of the stator core 100. The stator winding is wound on the stator core 100, and at least partially wound in the conductor slots 110. The number of phases of the stator winding is three-phase, that is, the stator assembly provided in the present application is suitable for a three-phase motor; the three phases of the stator winding can be U phase, V phase and W phase, respectively. The number of poles of the stator winding is 2p, or the number of pole pairs is p, where p is a positive integer, such as p=1, 2 or 3. The stator winding includes three-phase winding circuits, wherein the winding circuits of the V phase and the W phase are obtained by translating the winding circuit of the U phase by Z / 3p and 2Z / 3p conductor slots 110 respectively along the circumferential direction of the stator core 100, so as to ensure the three-phase balance of the stator winding. For the winding circuit of each phase of the stator winding, it includes m first winding branches, and the m first winding branches are connected in parallel. For each first winding branch, it also includes n second winding branches, and the n second winding branches are connected in series. It is not difficult to understand that the stator winding includes a total of m*n second winding branches, where m and n should be positive integers not less than 1.

[0048] In this embodiment, each second winding branch adopts a lap winding winding method, and at least one lap winding group is formed. Along the circumference of the stator core 100, the winding starting positions and winding end points of the m*n second winding branches are alternately distributed, that is, one of the second winding branches starts to be wound from its winding starting position, and after winding to its winding end point, the other second winding branch continues to be wound while maintaining a certain distance from the winding end point of the previous second winding branch. At the same time, the winding starting positions of the m*n second winding branches are also arranged at equal intervals along the circumference of the stator core 100. Similarly, the winding end points of the m*n second winding branches are also arranged at equal intervals along the circumference of the stator core 100. For the m first winding branches, their winding starting positions can be arranged at equal intervals or at non-equal intervals along the circumference of the stator core 100.

[0049] like Figure 1 and Figure 2 As shown, the stator winding also includes a bus bar assembly 200, and the number of the bus bar assemblies 200 is three. The three bus bar assemblies 200 correspond one-to-one to the winding circuits of the three phases. When the bus bar assembly 200 is connected to the winding circuit of the corresponding phase, it is connected to the winding starting position of the m first winding branches of the corresponding phase, so that the m first winding branches of the phase are connected in parallel.

[0050] The stator winding of the three-phase Z-slots with m first winding branches in parallel provided in the present application can be obtained by changing the stator winding of the existing three-phase Z-slots with m*n second winding branches in parallel.

[0051] For a stator winding with three-phase Z slots and m*n second winding branches in parallel, there are m*n connection points between the busbar assembly 200 of any phase and the winding circuit of the corresponding phase. Since the winding starting positions of the m*n second winding branches of any phase are arranged at equal intervals along the circumference of the stator core 100, and the winding end positions of the m*n second winding branches of the phase are also arranged at equal intervals along the circumference of the stator core 100, the span of the busbar assembly 200 of any phase of the stator winding is 360°*(m*n-1) / m*n. For a stator winding with three-phase Z slots and m first winding branches in parallel, there are m connection points between the busbar assembly 200 of any phase and the winding circuit of the corresponding phase. Any winding branch of the phase is formed by connecting n of the aforementioned second winding branches in series. Since the series connection modes of the n second winding branches are different, the winding starting positions of the m first winding branches of the phase are also different, which causes the winding starting positions of the m first winding branches of the phase to be arranged at equal or unequal intervals along the circumference of the stator core 100.

[0052] like Figure 3 As shown, taking Z=72, m=2, n=2 as an example, that is, for the existing stator winding, it is a three-phase 72-slot stator winding with four second winding branches in parallel. Taking the U phase of the stator winding as an example, the winding circuit of the U phase includes four parallel second winding branches, and the four parallel second winding branches can be numbered in sequence as U1X1, U2X2, U3X3 and U4X4, where "U?" can be regarded as the starting position of winding, and "X?" can be regarded as the end position of winding. There are four connection points between the busbar assembly 200 corresponding to U and the winding circuit of the U phase, namely U1-U4, and the span of the busbar assembly 200 of the U phase is 270°, namely the span between U1-U4.

[0053] like Figure 2As shown, for this embodiment, it is a three-phase 72-slot stator winding with two parallel first winding branches. Also taking the U phase as an example, the winding circuit of the U phase of the stator winding provided in this embodiment includes two parallel first winding branches, and there are two connection points between the busbar assembly 200 corresponding to U and the winding circuit of the U phase. The two parallel first winding branches of the U phase of the stator winding of this embodiment can be composed of the four second winding branches of the U phase of the aforementioned existing stator winding connected in series in pairs. When connected in series, U1X1 and U2X2 can be connected in series to form a first winding branch, and U3X3 and U4X4 can be connected in series to form another first winding branch. At this time, the winding starting positions of the two first winding branches of the U phase are U1 and U3, respectively, which are arranged at equal intervals along the circumference of the stator core 100; at this time, the span of the busbar assembly 200 corresponding to U is 180°. Of course, U1 X1 and U3X3 can also be connected in series to form a first winding branch, and U2X2 and U4X4 can be connected in series to form another first winding branch. At this time, the winding starting positions of the two first winding branches of the U phase are U1 and U2 respectively, which are arranged at non-uniform intervals along the circumference of the stator core 100, and the span of the busbar assembly 200 corresponding to U is 90°.

[0054] In some embodiments, Z, m and n may also be other parameters, such as Z=48, 56 or 64, m=3, 4 or 5, n=3, 4 or 5, etc.

[0055] It can be understood that the present application distributes the winding starting position and the winding ending position of the m*n second winding branches alternately along the circumference of the stator core 100, and sets the winding starting position and the winding ending position at equal intervals along the circumference of the stator core 100, and then connects them in series appropriately, and then connects them into m first winding branches in parallel through the busbar assembly 200. On the basis of basically not changing the linear shape of the coil, the existing three-phase Z-slot stator winding of m*n second winding branches in parallel can be adjusted to a three-phase Z-slot stator winding of m first winding branches in parallel; therefore, when the stator winding is adjusted from a larger number of parallel branches to a smaller number of branches, the present application does not need to redesign its second winding branch, but only needs to re-adjust the series and parallel sequence of its second winding branches, which can effectively improve the problem of greatly increased design difficulty and cost involved in the adjustment process of the stator winding. At the same time, after the stator winding is adjusted, the present application can also reduce the span of the busbar assembly 200, thereby effectively improving the problem that the busbar assembly 200 of the existing stator winding is large in size and easily fails due to vibration.

[0056] Specifically, the first winding branch includes an inlet wire 310, an outlet wire 320 and a connecting coil 330, and the second winding branch includes a plurality of stacked coils 340;

[0057] The lead-in wire 310 is the winding starting position of the first winding circuit. The lead-in wire 310 includes an lead-in effective edge 311, an lead-in welding end 312 and an lead-in twist end 313. The lead-in effective edge 311 is provided as one and is provided in the conductor slot 110. The lead-in welding end 312 and the lead-in twist end 313 are provided as one and are respectively provided at the two ends of the lead-in effective edge 311. The lead-in welding end 312 and the lead-in twist end 313 are provided on the same side of the lead-in effective edge 311.

[0058] The lead-out wire 320 is the winding end position of the first winding circuit. The lead-out wire 320 includes a lead-out effective edge 321, a lead-out welding end 322 and a lead-out twist end 323. The lead-out effective edge 321 is provided as one and is provided in the conductor slot 110. The lead-out welding end 322 and the lead-out twist end 323 are both provided as one and are respectively provided at the two ends of the lead-out effective edge 321. The lead-out welding end 322 and the lead-out twist end 323 are provided on the same side of the lead-out effective edge 321.

[0059] The second winding branch is lap-wound with a plurality of lap-wound coils 340, the lap-wound coils 340 include a lap-wound effective edge 341, a lap-wound welding end 342 and a lap-wound twist end 343, two lap-wound effective edges 341 are provided, and both are provided in the conductor slot 110, the lap-wound welding ends 342 correspond to the lap-wound effective edges 341 one by one, the two lap-wound welding ends 342 are provided at the same end of the two lap-wound effective edges 341, and are close to each other, and one lap-wound twist end 343 is provided, and is connected to the other ends of the two lap-wound effective edges 341;

[0060] The connecting coil 330 connects two consecutive second winding branches. The connecting coil 330 includes a connecting effective edge 331, a connecting welding end 332 and a connecting twist end 333. The connecting effective edges 331 are set to two and are both set in the conductor slot 110. The connecting welding ends 332 correspond to the connecting effective edges 331 one by one. The two connecting welding ends 332 are set at the same end of the two connecting effective edges 331 and extend in the same direction. The connecting twist end 333 is set to one and connects the other ends of the two connecting effective edges 331.

[0061] like Figure 2 , Figures 4 to 6As shown, in this embodiment, it is exemplarily explained that during winding, the first winding branch uses the lead-in wire 310 as the starting position of winding, the lead-out wire 320 as the end position of winding, and the stacked coil 340 is stacked, and at least two second winding branches are formed, and the adjacent second winding branches are connected by the connecting coil 330. The lead-in wire 310, the lead-out wire 320 and the stacked coil 340 can all be made of conductors, such as flat copper wires. In this case, the stator winding is suitable for the stator assembly of the flat wire motor. In the aforementioned coil, the part arranged in the conductor slot 110 is the effective edge; the connection position of the two adjacent coils is usually fixed by welding, so it is a welding end; and the end opposite to the welding end needs to be twisted after the stator winding is completed, so it is a twisting end.

[0062] like Figures 4 to 6 As shown in the present embodiment, the shape of the lead-in wire 310 and the lead-out wire 320 is similar to the letter "I", which can be called an Ip in wire. The lead-in wire 310 and the lead-out wire 320 have only one effective side, namely, the lead-in effective side 311 and the lead-out effective side 321; and correspondingly, they have only one welding end and a twist end, namely, the lead-in welding end 312 and the lead-out welding end 322, and the lead-in twist end 313 and the lead-out twist end 323. The shape of the stacked coil 340 and the connecting coil 330 is similar to the letter "U", which can be called an Up in wire. The lapped coil 340 and the connecting coil 330 both have two effective sides, namely the lapped effective side 341 and the connecting effective side 331; correspondingly, they both have two welding ends, namely the lapped welding end 342 and the connecting welding end 332, wherein the two lapped welding ends 342 are close to each other, so as to facilitate lap winding of two adjacent lapped coils 340 to form a second winding branch; and the two connecting welding ends 332 extend in the same direction, so as to facilitate connecting two consecutive second winding branches. At the same time, they both have a twist end, namely the lapped twist end 343 and the connecting twist end 333, wherein the lapped twist end 343 connects the two lapped effective sides 341, and the connecting twist end 333 connects the two connecting effective sides 331. It should be noted that the shape of the twist end of the Up in line is similar to a "V" shape, and the Ip in line can be regarded as one-half of the Up in line, and the shape of its twist end is similar to half of the "V" shape.

[0063] like Figure 2As shown, during the winding process of the first winding branch, the lead-in wire 310 is connected to a stacked coil 340, and the lead-in welding end 312 of the lead-in wire 310 is welded and fixed to a stacked welding end 342 of the stacked coil 340; when a plurality of stacked coils 340 are stacked to form a second winding branch, two adjacent stacked coils 340 are welded through one stacked welding end 342 thereof; when the connecting coil 330 connects two adjacent second winding branches, the connecting coil 330 is connected to two stacked coils 340, and the two connecting welding ends 332 of the connecting coil 330 are respectively welded and fixed to one stacked welding end 342 of a stacked coil 340; and the lead-out wire 320 is also connected to a stacked coil 340, and the lead-out welding end 322 of the lead-out wire 320 is welded and fixed to one stacked welding end 342 of the stacked coil 340.

[0064] Of course, in some embodiments, the first winding branch may not include the lead-in wire 310, the lead-out wire 320 and the connecting coil 330. In this case, the first winding branch may directly use a stacked coil 340 as the starting position for winding, and then stack several stacked coils 340 to form a second winding branch. Two adjacent second winding branches may be connected by a bridge wire. The bridge wire is used for the first winding branch to continue winding after crossing a certain number of conductor slots 110 during the winding process. The bridge wire can extend along the circumference of the stator core 100 and is located at the end of the stator winding. Its two ends are respectively welded and fixed to a stacked welding end 342 of a stacked coil 340. It is not difficult to see that the lead-in wire 310 and the half of the first stacked coil 340 in the aforementioned embodiment can be regarded as the first stacked coil 340 in this embodiment; and the connecting coil 330 in the aforementioned embodiment can be regarded as the half of two stacked coils 340 in this embodiment, and the two stacked coils 340 are respectively the last stacked coil 340 of the first second winding branch and the first stacked coil 340 of the second winding branch, and the two stacked coils 340 are connected by the bridge wire in this embodiment; similarly, the lead-out wire 320 and the half of the last stacked coil 340 in the aforementioned embodiment can be regarded as the last stacked coil 340 in this embodiment.

[0065] It can be understood that this embodiment avoids the use of bridge wires by setting the first winding branch to a winding route consisting of an introduction wire 310, a lead-out wire 320, a stacked coil 340 and a connecting coil 330, so as to avoid adding additional welding structures to the ends of the stator windings, thereby further improving the problem of failure of the stator winding due to vibration.

[0066] More specifically, the second winding branch includes at least two stacked windings, and the second winding branch also includes a reverse twist coil 350, which connects two consecutive stacked windings. The reverse twist coil 350 includes a reverse twist effective edge 351, a reverse twist welding end 352 and a reverse twist head end 353. The reverse twist effective edges 351 are set to two and are both set in the conductor slot 110. The reverse twist welding ends 352 correspond to the reverse twist effective edges 351 one by one. The two reverse twist welding ends 352 are set at the same end of the two reverse twist effective edges 351 and extend in the same direction. The reverse twist head end 353 is set to one and connects the other ends of the two reverse twist effective edges 351.

[0067] like Figure 2 and Figure 7 As shown, in this embodiment, it is exemplarily explained that for each second winding branch, it adopts a lapped coil 340 to form at least two lapped windings. The two lapped windings are connected by a reverse twist coil 350. Since the reverse twist coil 350 is also formed in a "U" shape, the reverse twist coil 350 is also an Up in line, which includes two reverse twist effective edges 351 respectively arranged in two conductor slots 110, and the same end of the two reverse twist effective edges 351 is respectively provided with a reverse twist welding end 352; when the reverse twist coil 350 is connected to the two lapped windings, its two reverse twist welding ends 352 are respectively welded and fixed to a lapped welding end 342 of a lapped coil 340. The other ends of the two reverse twist effective edges 351 can be connected through a reverse twist head end 353.

[0068] It can be understood that when the second winding branch includes at least two stacked windings, the present embodiment connects two consecutive stacked windings through the reverse twisted coil 350 to facilitate the winding and forming of the second winding branch.

[0069] More specifically, Z=72, m=2, n=2, p=4, and the conductor slot 110 is provided with 6 slot layers a, b, c, d, e and f;

[0070] The route of the first winding branch of the U phase is:

[0071] 1a-10b-2a-11b-3a-12b-3c-12d-2c-11d-1c-10d-1e-10f-2e-11f-3e-1 2f-21f-12e-20f-11e-19f-10e-19d-10c-20d-11c-21d-12c-21b-12a-20b-1 1a-19b-10a-19a-28b-20a-29b-21a-30b-21c-30d-20c-29d-19c-28d-19e-2 8f-20e-29f-21e-30f-39f-30e-38f-29e-37f-28e-37d-28c-38d-29c-39d-30c-39b-30a-38b-29a-37b-28a;

[0072] The route of the second first winding branch of phase U is:

[0073] 37a-46b-38a-47b-39a-48b-39c-48d-38c-47d-37c-46d-37e-46f-38e-47f-39e-4 8f-57f-48e-56f-47e-55f-46e-55d-46c-56d-47c-57d-48c-57b-48a-56b-47a-55b -46a-55a-64b-56a-65b-57a-66b-57c-66d-56c-65d-55c-64d-55e-64f-56e-65f-5 7e-66f-3f-66e-2f-65e-1f-64e-1d-64c-2d-65c-3d-66c-3b-66a-2b-65a-1b-64a.

[0074] like Figure 1 and Figure 2As shown, in this embodiment, it is exemplarily explained that when Z=72, m=2, n=2, and p=4, the stator winding is a stator winding with 72 slots, 8 poles, and 2 first winding branches, and each first winding branch includes 2 second winding branches connected in series. According to the line types of the aforementioned lead-in wire 310, lead-out wire 320, lapped coil 340, connecting coil 330, and reverse twist coil 350, the winding method provided in this embodiment is explained in combination with the first and second first winding branches of the U phase. For the convenience of explanation, the 72 conductor slots 110 can be sequentially numbered along the circumference of the stator core 100 using serial numbers "1"-"72", and the conductor slots 110 at any position of the circumference of the stator core 100 can be regarded as the conductor slots 110 with serial number "1", and the serial numbers "1"-"72" are only for the convenience of describing the position of the conductor slots 110, and are not used to limit the conductor slots 110 in any way. In some embodiments, the serial number of the conductor slot 110 may also be represented by other marks. For the serial number of the slot layer of the conductor slot 110, the same logic applies; slot layers a, b, c, d, e and f may be close to the axis of the stator core 100 in sequence along the radial direction.

[0075] In this embodiment, it is not difficult to see that the winding circuit corresponding to "1a" is the lead-in wire 310 of the first first winding branch of the U phase, and its lead-in effective edge 311 is arranged in the a slot layer of the conductor slot 110 with the serial number "1". The winding circuit corresponding to "10b-2a" is the first lapped coil 340 of the first first winding branch of the U phase, and its two lapped effective edges 341 are respectively arranged in the b slot layer of the conductor slot 110 with the serial number "10" and the a slot layer of the conductor slot 110 with the serial number "2". The subsequent winding circuits can be obtained in the same way, among which the winding circuit corresponding to "12f-21f" is the first reverse twist coil 350 of the first first winding branch of the U phase, and its two reverse twist effective edges 351 are respectively arranged in the f slot layer of the conductor slot 110 with the serial number "12" and the f slot layer of the conductor slot 110 with the serial number "20". The winding circuit corresponding to "10a-19a" is the connecting coil 330 of the first winding branch of the U phase, and its two connecting effective edges 331 are respectively arranged in the a slot layer of the conductor slot 110 with the serial number "10" and the a slot layer of the conductor slot 110 with the serial number "19". The winding circuit corresponding to "30f-39f" is the second reverse twisting coil 350 of the first winding branch of the U phase, and its two reverse twisting effective edges 351 are respectively arranged in the f slot layer of the conductor slot 110 with the serial number "30" and the f slot layer of the conductor slot 110 with the serial number "39". The winding circuit corresponding to "28a" is the lead-out wire 320 of the first winding branch of the U phase, and its lead-out effective edge 321 is arranged in the a slot layer of the conductor slot 110 with the serial number "28". At the same time, it is not difficult to see that

[0076] The winding circuit corresponding to “10b-2a-11b-3a-12b-3c-12d-2c-11d-1c-10d-1e-10f-2e-11f-3e-12f-21f-12e-20f-11e-19f-10e-19d-10c-20d-11c-21d-12c-21b-12a-20b-11a-19b” is the first second winding branch of the first first winding branch of the U phase, which includes two stacked windings, wherein the winding circuit corresponding to the first stacked winding is:

[0077] 10b-2a-11b-3a-12b-3c-12d-2c-11d-1c-10d-1e-10f-2e-11f-3e;

[0078] The winding circuit corresponding to the second lap winding is:

[0079] 12e-20f-11e-19f-10e-19d-10c-20d-11c-21d-12c-21b-12a-20b-11a-19b.

[0080] The winding circuit corresponding to “28b-20a-29b-21a-30b-21c-30d-20c-29d-19c-28d-19e-28f-20e-29f-21e-30f-39f-30e-38f-29e-37f-28e-37d-28c-38d-29c-39d-30c-39b-30a-38b-29a-37b” is the second second winding branch of the first first winding branch of the U phase, which also includes two stacked windings, wherein the winding circuit corresponding to the first stacked winding is:

[0081] 28b-20a-29b-21a-30b-21c-30d-20c-29d-19c-28d-19e-28f-20e-29f-21e;

[0082] The winding circuit corresponding to the second lap winding is:

[0083] 30e-38f-29e-37f-28e-37d-28c-38d-29c-39d-30c-39b-30a-38b-29a-37b.

[0084] The same is true for the second first winding branch of the U phase, where the winding line corresponding to "37a" is the lead-in line 310, and the winding line corresponding to "64a" is the lead-out line 320. The winding line corresponding to the first second winding branch of the second first winding branch of the U phase is:

[0085] 46b-38a-47b-39a-48b-39c-48d-38c-47d-37c-46d-37e-46f-38e-47f-39e-48f-57f-48e-56f-47e-55f-46e-55d-46c-56d-47c-57d-48c-57b-48a-56b-47a-55b; it includes two stacked windings, wherein the winding circuit corresponding to the first stacked winding is:

[0086] 46b-38a-47b-39a-48b-39c-48d-38c-47d-37c-46d-37e-46f-38e-47f-39e;

[0087] The winding circuit corresponding to the second lap winding is:

[0088] 48e-56f-47e-55f-46e-55d-46c-56d-47c-57d-48c-57b-48a-56b-47a-55b;

[0089] The winding circuit corresponding to “48f-57f” is the reverse twisted coil 350 connecting the two stacked windings.

[0090] The winding line corresponding to the second second winding branch of the second first winding branch of phase U is:

[0091] 64b-56a-65b-57a-66b-57c-66d-56c-65d-55c-64d-55e-64f-56e-65f-57e-66f-3f-66e-2f-65e-1f-64e-1d-64c-2d-65c-3d-66c-3b-66a-2b-65a-1b; it includes two stacked windings, wherein the winding circuit corresponding to the first stacked winding is:

[0092] 64b-56a-65b-57a-66b-57c-66d-56c-65d-55c-64d-55e-64f-56e-65f-57e;

[0093] The winding circuit corresponding to the second lap winding is:

[0094] 66e-2f-65e-1f-64e-1d-64c-2d-65c-3d-66c-3b-66a-2b-65a-1b;

[0095] The winding circuit corresponding to “66f-3f” is the reverse twisted coil 350 connecting the two stacked windings.

[0096] The winding branches corresponding to the connecting coil 330 connecting the first second winding branch and the second second winding branch of the second first winding branch of the U phase are: 46a-55a.

[0097] like Figure 2 As shown, according to the above, the winding starting positions of the first second winding branch and the second second winding branch of the first first winding branch of the U phase are "10b" and "28b" respectively, and the winding starting positions of the first second winding branch and the second second winding branch of the second first winding branch of the U phase are "46b" and "64b" respectively; it is not difficult to see that the winding starting positions of the four second winding branches are arranged at equal intervals along the circumference of the stator core 100. The winding end positions of the first second winding branch and the second second winding branch of the first first winding branch of the U phase are "19b" and "37b" respectively, and the winding end positions of the first second winding branch and the second second winding branch of the second first winding branch of the U phase are "55b" and "1b" respectively; it is not difficult to see that the winding end positions of the four second winding branches are also arranged at equal intervals along the circumference of the stator core 100. In this embodiment, "U?" can be used to indicate the winding start position, and "X?" can be used to indicate the winding end position; therefore, the aforementioned four second winding branches can be numbered as U1X1, U2X2, U3X3, and U4X4, where U1X1 and U2X2 are connected in series to form the first first winding branch of the U phase, i.e., U1X2, and U3X3 and U4X4 are connected in series to form the second first winding branch of the U phase, i.e., U3X4. At this time, the winding start positions of the two first winding branches of the U phase are arranged at equal intervals along the circumference of the stator core 100, and the span of the busbar assembly 200 corresponding to U is 180°, i.e., the span between U1 and U3.

[0098] The winding circuits of the V phase and the W phase can be obtained similarly, wherein the winding circuit of the V phase can be obtained by translating the winding circuit of the U phase by 6 conductor slots 110 in the direction of increasing conductor slot 110 serial numbers, and its two parallel first winding branches can be V1Y2 and V3Y4 respectively; the winding circuit of the W phase can be obtained by translating the winding circuit of the U phase by 12 conductor slots 110 in the direction of increasing conductor slot 110 serial numbers, and its two parallel first winding branches can be W1 Z2 and W3Z4 respectively.

[0099] It can be understood that, in the stator winding of 72 slots, 8 poles and 2 first winding branches, this embodiment distributes the winding start positions and winding end positions of the 4 second winding branches alternately along the circumference of the stator core 100, and sets the winding start positions and winding end positions at equal intervals along the circumference of the stator core 100, and then connects them in series appropriately, and then connects them into 2 parallel first winding branches through the busbar assembly 200. On the basis of basically not changing the linear shape of the coil, the existing three-phase 72-slot stator winding of 4 second winding branches in parallel can be adjusted to a three-phase 72-slot stator winding of 2 first winding branches in parallel.

[0100] Specifically, the stator winding further includes a fixing member 400 , and the fixing member 400 connects the three busbar assemblies 200 into a whole.

[0101] like Figure 1 As shown, in this embodiment, the fixing member 400 can be made of injection molding material, which is used to connect the three busbar assemblies 200. The fixing member 400 can be set in a columnar shape and arranged along the radial direction of the stator core 100. A plurality of fixing members 400 can be arranged along the circumferential spacing of the stator core 100 to fix the three busbar assemblies 200 at multiple locations.

[0102] It can be understood that, by providing the fixing member 400 , the present embodiment can improve the stability of the connection between the three busbar assemblies 200 and the winding circuits of the three phases, so as to further prevent the stator winding from failing due to vibration.

[0103] More specifically, the busbar assembly 200 includes a copper busbar 210 and a busbar 220 . The busbar 220 corresponds one-to-one to the m first winding branches, and the copper busbar 210 connects the m busbars 220 .

[0104] like Figure 1 and Figure 2 As shown, in this embodiment, it is exemplarily explained that the busbar assembly 200 may include a copper bar 210 and a busbar 220, wherein the busbar 220 may be made of a flexible round copper wire, and its number corresponds to the number of the first winding branches of the corresponding phase, that is, m; in this embodiment, each busbar assembly 200 includes two busbars 220. The busbar 220 may extend along the circumference of the stator core 100, and one end of the two busbars 220 is respectively welded and fixed to the winding starting positions of the two first winding branches of the U phase, that is, U1 and U3. The copper bar 210 is welded and fixed to the other ends of the two busbars 220 so that the two first winding branches of the U phase are connected in parallel. When the aforementioned fixing member 400 is used to fix the three busbar assemblies 200, it can be injection molded on the busbar 220.

[0105] It can be understood that this embodiment facilitates the connection of the busbar assembly 200 with the three-phase winding circuits by reasonably arranging the composition structure of the busbar assembly 200, and at the same time can make the busbar assembly 200 not easy to loosen and fall off due to vibration.

[0106] Specifically, the stator winding further includes a star point copper bar 500 , which corresponds one to one with the first winding branches, and the star point copper bar 500 is connected to the winding end positions of the three corresponding first winding branches.

[0107] like Figure 1 and Figure 8 As shown, in this embodiment, it is exemplarily explained that the star point copper bar 500 can be set to an arc shape, which can be arranged at one end of the three-phase winding circuit, and can be arranged along the circumference of the stator core 100. The star point copper bar 500 corresponds to the first winding branch one by one, that is, two star point copper plates are provided in this embodiment. The star point copper bar 500 is connected to the winding end positions of the three corresponding first winding branches, that is, one of the star point copper bars 500 in this embodiment is connected to the winding end positions of the first first winding branches of the U phase, the V phase and the W phase in sequence, that is, X2, Y2 and Z2; the other star point copper bar 500 is connected to the winding end positions of the second first winding branches of the U phase, the V phase and the W phase in sequence, that is, X4, Y4 and Z4.

[0108] Of course, in some embodiments, only one star point copper bar 500 may be provided, and the star point copper bar 500 is connected to the winding end positions of the 3m first winding branches of the three phases, namely X2, Y2, Z2, X4, Y4 and Z4. It is not difficult to see that the star point copper bar 500 in this embodiment extends a long distance along the circumference of the stator core 100.

[0109] It can be understood that, in this embodiment, by providing a star-point copper bar 500 and properly connecting it to the winding circuits of the three phases, the span of the star-point copper bar 500 along the circumferential direction of the stator core 100 can be reduced to reduce the size of the star-point copper bar 500, thereby improving its stability when connected to the winding circuits of the three phases.

[0110] The implementation principle of a stator winding provided in the first embodiment of the present application is:

[0111] First, the winding circuits of the three phases are wound and formed. When winding, the first winding branch of each phase uses the lead-in wire 310 as the winding starting position, and is wound with the stacked coil 340 to form a stacked winding; the two stacked windings are connected with the reverse twist coil 350 to form a second winding branch; the two second winding branches are connected with the connecting coil 330, and the lead-out wire 320 is used as the winding end position. After the winding circuits of the three phases are completed, the busbar assembly 200 is connected to the winding starting position of the two first winding branches of the corresponding phases, and the star point copper bar 500 is connected to the winding end positions of the three corresponding first winding branches. Subsequently, the three busbar assemblies 200 are fixed as an integral component through the fixing member 400.

[0112] The present application distributes the winding start position and the winding end position of m*n second winding branches alternately along the circumference of the stator core 100, and sets the winding start position and the winding end position at equal intervals along the circumference of the stator core 100, then connects them in series appropriately, and then connects them into m first winding branches in parallel through the busbar assembly 200. On the basis of basically not changing the linear shape of the coil, the existing three-phase Z-slot stator winding with m*n second winding branches in parallel can be adjusted to a three-phase Z-slot stator winding with m first winding branches in parallel. Therefore, when the stator winding is adjusted from a larger number of parallel branches to a smaller number of branches, the present application does not need to redesign its second winding branch, but only needs to re-adjust the series and parallel sequence of its second winding branches, which can effectively improve the problem of greatly increased design difficulty and cost involved in the adjustment process of the stator winding. At the same time, after the stator winding is adjusted, the present application can also reduce the span of the busbar assembly 200, thereby effectively improving the problem that the busbar assembly 200 of the existing stator winding is large in size and easily fails due to vibration.

[0113] Embodiment 2

[0114] Embodiment 2 of the present application provides a stator winding, and the difference between this embodiment and embodiment 1 is at least in: the winding starting position of the two first winding branches of the U phase.

[0115] Specifically, 5, Z=72, m=2, n=2, p=4, the conductor slot 110 is provided with 6 slot layers a, b, c, d, e and f;

[0116] The route of the first winding branch of the U phase is:

[0117] 1a-10b-2a-11b-3a-12b-3c-12d-2c-11d-1c-10d-1e-10f-2e-11f-3f-1 2f-21f-12e-20f-11e-19f-10e-19d-10c-20d-11c-21d-12c-21b-12a-20b-1 1a-19b-10a-37a-46b-38a-47b-39a-48b-39c-48d-38c-47d-37c-46d-37e-4 6f-38e-47f-39f-48f-57f-48e-56f-47e-55f-46e-55d-46c-56d-47c-57d-48c-57b-48a-56b-47a-55b-46a;

[0118] The route of the second first winding branch of phase U is:

[0119] 19a-28b-20a-29b-21a-30b-21c-30d-20c-29d-19c-28d-19e-28f-20e-29f-21e-3 0f-39f-30e-38f-29e-37f-28e-37d-28c-38d-29c-39d-30c-39b-30a-38b-29a-37b -28a-55a-64b-56a-65b-57a-66b-57c-66d-56c-65d-55c-64d-55e-64f-56e-65f-5 7e-66f-3f-66e-2f-65e-1f-64e-1d-64c-2d-65c-3d-66c-3b-66a-2b-65a-1b-64a.

[0120] like Fig. 9 As shown, in this embodiment, it is exemplarily explained that the lead-in wire 310 of the first winding branch of the U phase is the winding line corresponding to "1a", and the lead-out wire 320 of the first winding branch of the U phase is the winding line corresponding to "28a";

[0121] The winding line corresponding to “10b-2a-11b-3a-12b-3c-12d-2c-11d-1c-10d-1e-10f-2e-11f-3e-12f-21f-12e-20f-11e-19f-10e-19d-10c-20d-11c-21d-12c-21b-12a-20b-11a-19b” is the first second winding branch of the first first winding branch of phase U;

[0122] The winding circuit corresponding to "46b-38a-47b-39a-48b-39c-48d-38c-47d-37c-46d-37e-46f-38e-47f-39f-48f-57f-48e-56f-47e-55f-46e-55d-46c-56d-47c-57d-48c-57b-48a-56b-47a-55b" is the second second winding branch of the first first winding branch of the U phase.

[0123] The lead-in wire 310 of the second first winding branch of the U phase is the winding line corresponding to "37a", and the lead-out wire 320 of the second first winding branch of the U phase is the winding line corresponding to "64a";

[0124] The winding line corresponding to “28b-20a-29b-21a-30b-21c-30d-20c-29d-19c-28d-19e-28f-20e-29f-21e-30f-39f-30e-38f-29e-37f-28e-37d-28c-38d-29c-39d-30c-39b-30a-38b-29a-37b” is the first second winding branch of the second first winding branch of phase U;

[0125] The winding circuit corresponding to "64b-56a-65b-57a-66b-57c-66d-56c-65d-55c-64d-55e-64f-56e-65f-57e-66f-3f-66e-2f-65e-1f-64e-1d-64c-2d-65c-3d-66c-3b-66a-2b-65a-1b" is the second second winding branch of the second first winding branch of the U phase.

[0126] like Fig. 9As shown, in this embodiment, the winding starting positions of the first second winding branch and the second second winding branch of the first first winding branch of the U phase are "10b" and "46b" respectively, and the winding starting positions of the first second winding branch and the second second winding branch of the second first winding branch of the U phase are "28b" and "64b" respectively; it is not difficult to see that the winding starting positions of the four second winding branches are arranged at equal intervals along the circumference of the stator core 100. The winding end positions of the first second winding branch and the second second winding branch of the first first winding branch of the U phase are "19b" and "55b" respectively, and the winding end positions of the first second winding branch and the second second winding branch of the second first winding branch of the U phase are "37b" and "1b" respectively; it is not difficult to see that the winding end positions of the four second winding branches are also arranged at equal intervals along the circumference of the stator core 100. Among the four second winding branches, namely, U1X1, U2X2, U3X3 and U4X4, U1X1 and U3X3 are connected in series to form the first first winding branch of the U phase, namely, U1X3; U2X2 and U4X4 are connected in series to form the second first winding branch of the U phase, namely, U2X4. At this time, the winding starting positions of the two first winding branches of the U phase are arranged at non-equal intervals along the circumference of the stator core 100, and the span of the busbar assembly 200 corresponding to U is 90°, which is the span between U1 and U2.

[0127] It is understandable that this embodiment can also adjust the existing three-phase 72-slot parallel stator winding of four second winding branches to a three-phase 72-slot parallel stator winding of two first winding branches without substantially changing the line shape of the coil.

[0128] Embodiment 3

[0129] Embodiment 3 of the present application provides a stator assembly, and the stator assembly includes any stator winding provided in the present application.

[0130] Embodiment 4

[0131] Embodiment 4 of the present application provides a motor, which includes any stator assembly provided in the present application.

[0132] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0133] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A stator winding, characterized in that: The number of phases of the stator winding is three phases, and the number of poles is 2p. The stator winding is suitable for a stator assembly. The stator assembly also includes a stator core (100). The stator core (100) is provided with Z conductor slots (110) at equal intervals along the circumferential direction. The stator winding is wound on the stator core (100). The stator winding includes a busbar assembly (200) and winding circuits of three phases, namely, U, V and W. The winding circuits of the V phase and the W phase are obtained by translating the winding circuit of the U phase by Z / 3p and 2Z / 3p conductor slots (110) respectively along the circumferential direction of the stator core (100). The winding circuit of each phase includes m first winding branches connected in parallel, and each of the first winding branches includes n second winding branches connected in series. The second winding branch adopts a lap winding method and includes at least one lap winding. The winding starting positions of the m first winding branches are arranged at equal intervals or unequal intervals along the circumference of the stator core (100), the winding starting positions and winding ending positions of the m*n second winding branches are alternately distributed along the circumference of the stator core (100), and the winding starting positions of the m*n second winding branches are arranged at equal intervals along the circumference of the stator core (100), and the winding ending positions of the m*n second winding branches are arranged at equal intervals along the circumference of the stator core (100); The busbar assembly (200) corresponds to the three phases one by one, and the busbar assembly (200) is connected to the winding starting positions of the m first winding branches of the corresponding phases.

2. The stator winding according to claim 1, characterized in that: The first winding branch includes an inlet wire (310), an outlet wire (320) and a connecting coil (330), and the second winding branch includes a plurality of stacked coils (340); The lead-in wire (310) is the winding starting position of the first winding circuit, and the lead-in wire (310) comprises an lead-in effective edge (311), an lead-in welding end (312) and an lead-in twist end (313); the lead-in effective edge (311) is provided as one and is arranged in the conductor slot (110); the lead-in welding end (312) and the lead-in twist end (313) are both provided as one and are arranged at two ends of the lead-in effective edge (311), respectively; the lead-in welding end (312) and the lead-in twist end (313) are arranged on the same side of the lead-in effective edge (311); The lead-out wire (320) is the winding end position of the first winding circuit, and the lead-out wire (320) includes a lead-out effective edge (321), a lead-out welding end (322) and a lead-out twist end (323). The lead-out effective edge (321) is provided as one and is provided in the conductor slot (110). The lead-out welding end (322) and the lead-out twist end (323) are both provided as one and are respectively provided at two ends of the lead-out effective edge (321). The lead-out welding end (322) and the lead-out twist end (323) are provided on the same side of the lead-out effective edge (321); The second winding branch is lap-wound with a plurality of lap-wound coils (340), the lap-wound coils (340) comprising a lap-wound effective edge (341), a lap-wound welding end (342) and a lap-wound twist end (343), the lap-wound effective edge (341) is provided in two numbers and both are provided in the conductor slot (110), the lap-wound welding end (342) corresponds to the lap-wound effective edge (341) in one-to-one correspondence, the two lap-wound welding ends (342) are provided at the same end of the two lap-wound effective edges (341) and are close to each other, the lap-wound twist end (343) is provided in one number and is connected to the other ends of the two lap-wound effective edges (341); The connecting coil (330) connects two consecutive second winding branches, and the connecting coil (330) comprises a connecting effective edge (331), a connecting welding end (332) and a connecting twist end (333). The connecting effective edges (331) are provided in two numbers and are both provided in the conductor slot (110). The connecting welding ends (332) correspond to the connecting effective edges (331) in a one-to-one manner. The two connecting welding ends (332) are provided at the same end of the two connecting effective edges (331) and extend in the same direction. The connecting twist end (333) is provided in one number and is connected to the other ends of the two connecting effective edges (331).

3. The stator winding according to claim 2, characterized in that: The second winding branch comprises at least two stacked windings, and the second winding branch further comprises a reverse twist coil (350), wherein the reverse twist coil (350) connects two consecutive stacked windings, and the reverse twist coil (350) comprises a reverse twist effective edge (351), a reverse twist welding end (352) and a reverse twist head end (353). The reverse twist effective edges (351) are provided in two numbers and are both provided in the conductor slot (110). The reverse twist welding end (352) corresponds to the reverse twist effective edge (351) in one-to-one relationship. The two reverse twist welding ends (352) are provided at the same end of the two reverse twist effective edges (351) and extend in the same direction. The reverse twist head end (353) is provided in one number and is connected to the other ends of the two reverse twist effective edges (351).

4. The stator winding according to claim 3, characterized in that: Z=72, m=2, n=2, p=4, the conductor slot (110) is provided with 6 slot layers a, b, c, d, e and f in total; The route of the first winding branch of the U phase is: 1a-10b-2a-11b-3a-12b-3c-12d-2c-11d-1c-10d-1e-10f-2e-11f-3e-1 2f-21f-12e-20f-11e-19f-10e-19d-10c-20d-11c-21d-12c-21b-12a-20b-1 1a-19b-10a-19a-28b-20a-29b-21a-30b-21c-30d-20c-29d-19c-28d-19e-2 8f-20e-29f-21e-30f-39f-30e-38f-29e-37f-28e-37d-28c-38d-29c-39d-30c-39b-30a-38b-29a-37b-28a; The route of the second first winding branch of the U phase is: 37a-46b-38a-47b-39a-48b-39c-48d-38c-47d-37c-46d-37e-46f-38e-47f-39e-4 8f-57f-48e-56f-47e-55f-46e-55d-46c-56d-47c-57d-48c-57b-48a-56b-47a-55b -46a-55a-64b-56a-65b-57a-66b-57c-66d-56c-65d-55c-64d-55e-64f-56e-65f-5 7e-66f-3f-66e-2f-65e-1f-64e-1d-64c-2d-65c-3d-66c-3b-66a-2b-65a-1b-64a.

5. The stator winding according to claim 3, characterized in that: Z=72, m=2, n=2, p=4, the conductor slot (110) is provided with 6 slot layers a, b, c, d, e and f in total; The route of the first winding branch of the U phase is: 1a-10b-2a-11b-3a-12b-3c-12d-2c-11d-1c-10d-1e-10f-2e-11f-3f-1 2f-21f-12e-20f-11e-19f-10e-19d-10c-20d-11c-21d-12c-21b-12a-20b-1 1a-19b-10a-37a-46b-38a-47b-39a-48b-39c-48d-38c-47d-37c-46d-37e-4 6f-38e-47f-39f-48f-57f-48e-56f-47e-55f-46e-55d-46c-56d-47c-57d-48c-57b-48a-56b-47a-55b-46a; The route of the second first winding branch of the U phase is: 19a-28b-20a-29b-21a-30b-21c-30d-20c-29d-19c-28d-19e-28f-20e-29f-21e-3 0f-39f-30e-38f-29e-37f-28e-37d-28c-38d-29c-39d-30c-39b-30a-38b-29a-37b -28a-55a-64b-56a-65b-57a-66b-57c-66d-56c-65d-55c-64d-55e-64f-56e-65f-5 7e-66f-3f-66e-2f-65e-1f-64e-1d-64c-2d-65c-3d-66c-3b-66a-2b-65a-1b-64a.

6. The stator winding according to claim 1, characterized in that: The stator winding further comprises a fixing member (400), wherein the fixing member (400) connects the three busbar assemblies (200) into a whole.

7. The stator winding according to claim 1, characterized in that: The busbar assembly (200) comprises a copper bar (210) and a busbar (220), wherein the busbar (220) corresponds one-to-one to m of the first winding branches, and the copper bar (210) connects the m busbars (220).

8. The stator winding according to claim 1, characterized in that: The stator winding further comprises a star point copper bar (500), the star point copper bar (500) corresponds one-to-one to the first winding branches, and the star point copper bar (500) is connected to the winding end positions of three corresponding first winding branches.

9. A stator assembly, characterized in that: The stator assembly comprises the stator winding according to any one of claims 1-8.

10. A motor, characterized in that: The electric machine comprises the stator assembly according to claim 9.

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