Stator assembly, motor, electric assembly, and vehicle

Abstract

A stator assembly, a motor, an electric assembly, and a vehicle. The stator assembly is applicable to a motor having z slots, 2p poles, and m phases, wherein y=z / (2p), and the number q of slots per pole and phase is equal to z / m / (2p). The stator assembly comprises a stator core and a stator winding. The stator core is provided with multiple stator slots arranged at intervals in the circumferential direction of the stator core, and multiple slot layers in the multiple stator slots form a first slot layer group, a second slot layer group, and multiple intermediate slot layer groups. The stator winding comprises at least one first winding segment, any first winding segment among the at least one first winding segment spans y1 stator slots among the multiple stator slots, any first winding segment comprises two first in-slot portions, the two first in-slot portions are respectively located in adjacent intermediate slot layer groups among the multiple intermediate slot layer groups, and y1 satisfies: y-x1-(q-1)≤y1≤y-x1+(q-1).

Description

Stator assembly, motor, electric powertrain and vehicle

[0001] This application claims priority to Chinese patent application No. 202410520658.9, filed on April 26, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of electric motor technology, and more particularly to a stator assembly, an electric motor, an electric powertrain, and a vehicle. Background Technology

[0003] As one of the three core components of new energy vehicles, the drive motor determines the vehicle's main performance indicators, such as climbing ability, acceleration, and top speed, and directly affects the vehicle's power, economy, and comfort. Compared to round wire motors, flat wire motors have a higher slot fill factor, better heat dissipation, higher power density, and smaller size and weight. Summary of the Invention

[0004] This disclosure aims to at least address one of the technical problems existing in the related art. To this end, this disclosure proposes a stator assembly, a motor, and a vehicle. The stator assembly can effectively suppress the occurrence of motor vibration or noise, which is beneficial to improving the NVH performance of the vehicle.

[0005] In a first aspect, some embodiments of this disclosure provide a stator assembly suitable for a z-slot 2p-pole m-phase motor, where y = z / (2p) and the number of slots per pole per phase is q = z / m / (2p). The stator assembly includes a stator core and stator windings. The stator core has a plurality of stator slots spaced circumferentially along the stator core. Each of the plurality of stator slots has a plurality of slot layers arranged radially along the stator core. The same slot layer of the plurality of stator slots forms a slot layer group. The slot layer group includes a first slot layer group, a second slot layer group, and a plurality of intermediate slot layer groups, with the plurality of intermediate slot layer groups located between the first slot layer group and the second slot layer group. The stator winding includes at least one first winding segment, any one of the at least one first winding segment spans y1 stator slots in the plurality of stator slots, and any one first winding segment includes two inner portions of the first slots, the two inner portions of the first slots being located in two adjacent intermediate slot layers in the plurality of intermediate slot layers, and y1 satisfying: y-x1-(q-1)≤y1≤y-x1+(q-1), where x1 is a positive integer and x1<q.

[0006] In the above technical solution, by setting the two first slots of the first winding segment to be located in two adjacent intermediate slot layers, and the span y1 of the first winding segment satisfies: y-x1-(q-1)≤y1≤y-x1+(q-1), where x1 is a positive integer and x1<q, at least part of the stator winding can be wound in the intermediate slot layers using a "short-pitch + cross-layer" method. This can effectively suppress the harmonic electromagnetic excitation generated by the circulating current, such as eliminating the 5th or 7th harmonics in the magnetic field, thereby effectively suppressing the occurrence of motor vibration or noise, which is beneficial to improving the NVH (noise, vibration and harshness) effect of the vehicle. Furthermore, it is also convenient to realize different short-pitch winding settings of the stator winding, which is beneficial to improving the adaptability of the stator assembly.

[0007] In some embodiments of this disclosure, y1 satisfies: y1 + x1 = y.

[0008] In some embodiments of this disclosure, the at least one first winding segment includes the plurality of first winding segments, wherein the plurality of first winding segments have equal spans.

[0009] In some embodiments of this disclosure, the plurality of trench layers includes at least 10 trench layers.

[0010] In some embodiments of this disclosure, each phase of the stator winding includes multiple branches, each branch including multiple first winding segments arranged radially along the stator core. The corresponding first slot portions of two adjacent first winding segments are located in the same stator slot. Each of the two first slot portions has two first connecting portions at one end, extending circumferentially towards each other. The corresponding first connecting portions of two adjacent first winding segments are connected to each other, thus connecting the adjacent first winding segments in series.

[0011] In some embodiments of this disclosure, the plurality of intermediate slot layer groups include at least one first intermediate slot layer group and at least one second intermediate slot layer group arranged radially along the stator core, wherein, within the same magnetic pole, the in-phase windings of the stator windings in the at least one first intermediate slot layer group and the at least one second intermediate slot layer group are circumferentially offset from the x1 stator slots.

[0012] In some embodiments of this disclosure, the at least one first intermediate slot layer group includes a plurality of first intermediate slot layer groups, and the at least one second intermediate slot layer group includes a plurality of second intermediate slot layer groups. The plurality of first intermediate slot layer groups are arranged adjacently to form a first intermediate slot layer unit, and the plurality of second intermediate slot layer groups are arranged adjacently to form a second intermediate slot layer unit. The first intermediate slot layer unit and the second intermediate slot layer unit are arranged alternately along the radial direction of the stator core; or, the plurality of first intermediate slot layer groups and the plurality of second intermediate slot layer groups are arranged alternately along the radial direction of the stator core.

[0013] In some embodiments of this disclosure, the stator winding further includes at least one second winding segment, any one of the at least one second winding segment spanning y2 stator slots, each second winding segment including two inner portions of the second slots, both of which are located in the first slot layer group, the radial distance between the first slot layer group and the central axis of the stator core being less than the radial distance between the remaining slot layer groups and the central axis of the stator core, and y2 satisfying: y-(q-1)≤y2≤y+(q-1).

[0014] In some embodiments of this disclosure, q≥4, each phase of the stator winding includes multiple second winding segments, at least one of the multiple second winding segments has a span y2=y-(q-1), and at least one of the remaining second winding segments has a span y2=y+(q-3).

[0015] In some embodiments of this disclosure, the stator winding further includes at least one third winding segment, any one of the at least one third winding segment spans y3 stator slots, and any one third winding segment includes two inner portions of the third slots, both of which are located in the second slot layer group. The radial distance between the second slot layer group and the central axis of the stator core is greater than the radial distance between the other slot layer groups and the central axis of the stator core. The y3 satisfies: y-(q-1)≤y3≤y+(q-1).

[0016] In some embodiments of this disclosure, q≥4, and each phase of the stator winding includes multiple third winding segments, the span of which satisfies y3=y-(q-3).

[0017] In some embodiments of this disclosure, z = 72, 2p = 6, m = 3, q ​​= 4, and each phase of the stator winding includes 6 branches. The winding path of the first branch of the first phase of the stator winding is as follows: 1j→12j→22i→12h→22g→12f→22e→12d→22c→12b→22a→13a→3b→13c→3d→13e→3f→13g→3h→13i→3j→14j→24i→14h→24g→14f→24e→14d→24c→14b→24a→11a→1b→11c→1d→11e→1f→11g→1h→11i; the winding path of the second branch of the first phase of the stator winding is as follows: 2b→12c→2d→12e→2f→12g→2h→12i→2 j→63j→1i→63h→1g→63f→1e→63d→1c→63b→1a→10a→72b→10c→72d→10e→72f→10g→72h→10i→72j→61j→71i→61h→71g→61f→71e→61d→71c→61b→71a→12a; The winding path of the third branch of the first phase of the stator winding is as follows: 25j→36j→46i→36h→46g→36f→46e→36d→46c→36b→46a→37a→27b→37c→27d→37e→27f→37g→27h→37i →27j→38j→48i→38h→48g→38f→48e→38d→48c→38b→48a→35a→25b→35c→25d→35e→25f→35g→25h→35i; The winding path of the fourth branch of the first phase of the stator winding is as follows: 26b→36c→26d→36e→26f→36g→26h→36i→26j→15j→25i→15h→25g→15f→25e→15d→25c→15b→25a→34a→24b→34c→24d→34e→24f→34g→24h→34i→24j→13j →23i→13h→23g→13f→23e→13d→23c→13b→23a→36a; The winding path of the fifth branch of the first phase of the stator winding is as follows: 49j→60j→70i→60h→70g→60f→70e→60d→70c→60b→70a→61a→51b→61c→51d→61e→51f→61g→51h→61i→51j→62j→72i→62h→72g→62f→72e→62d→72c→62b→72a→59a→49b→59c→49d→59e→49f→59g→49h→59i;The winding path of the sixth branch of the first phase of the stator winding is as follows: 50b→60c→50d→60e→50f→60g→50h→60i→50j→39j→49i→39h→49g→39f→49e→39d→49c→39b→49a→58a→48b→58c→48d→58e→48f→58g→48h→58i→48j→37j→47i→37h→47g→37f→47e→37d→47c→37b→47a→60a.

[0018] In some embodiments of this disclosure, each phase of the stator winding includes multiple branches, and the two ends of each branch are a first end and a second end, respectively. The first end is connected to a lead wire, and the second end is connected to a star point wire. The first end and the second end of the at least one branch are respectively located in two adjacent slots in the multiple slot layers.

[0019] In some embodiments of this disclosure, the plurality of branches satisfy at least one of the following conditions: Condition A1: the second end of at least one of the plurality of branches is located in the innermost slot layer, and the first end of the plurality of branches is located in a slot layer adjacent to the innermost slot layer; Condition A2: the first end of at least one of the plurality of branches is located in the outermost slot layer, and the second end of the plurality of branches is located in a slot layer adjacent to the outermost slot layer; Condition A3: the first ends of two adjacent branches in the same phase are respectively located in the outermost slot layer and in a slot layer adjacent to the innermost slot layer; Condition A4: the first ends of two adjacent branches in the same phase are respectively located in the outermost slot layer and in the innermost slot layer.

[0020] In some embodiments of this disclosure, the lead-out line and the star-point line of each branch are located at the same end of the axial direction of the stator core.

[0021] Secondly, some embodiments of this disclosure provide an electric motor including a stator assembly according to the first aspect of this disclosure described above.

[0022] In the above technical solution, the performance of the motor can be improved by adopting the stator assembly described above.

[0023] Thirdly, some embodiments of this disclosure provide an electric powertrain including a motor according to the second aspect of the present disclosure described above.

[0024] In the above technical solution, the performance of the electric powertrain can be improved by using the aforementioned motor.

[0025] Fourthly, some embodiments of this disclosure provide a vehicle including a motor according to the second aspect of this disclosure or an electric powertrain according to the third aspect of this disclosure.

[0026] In the above technical solutions, the NVH performance of the vehicle can be improved by adopting the aforementioned motor or electric assembly.

[0027] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0029] Figure 1 is a structural diagram of a stator assembly according to some embodiments of the present disclosure;

[0030] Figure 2 is a magnified view of part A circled in Figure 1;

[0031] Figure 3 is a structural diagram of a stator winding according to some embodiments of the present disclosure;

[0032] Figure 4 is a magnified view of part B circled in Figure 3;

[0033] Figure 5 is a structural diagram of a stator core according to some embodiments of the present disclosure;

[0034] Figure 6 is a magnified view of part C circled in Figure 5;

[0035] Figure 7 is a schematic diagram of the distribution of the U-phase branch of the stator winding and the direction of the current in the slot according to some embodiments of the present disclosure, wherein the first slot layer group and the second slot layer group indicated by the dashed circle in the figure are both part of the corresponding slot layer group;

[0036] Figure 8 is a schematic diagram of a winding group of a U-phase first branch according to some embodiments of the present disclosure;

[0037] Figure 9 is a schematic diagram of another winding group of the first branch of the U phase according to some embodiments of the present disclosure;

[0038] Figure 10 is a structural diagram of a second winding segment according to some embodiments of the present disclosure;

[0039] Figure 11 is another structural diagram of the second winding segment according to some embodiments of the present disclosure;

[0040] Figure 12 is a structural diagram of a first winding segment (spanning from layer b to layer c) according to some embodiments of the present disclosure;

[0041] Figure 13 is a structural diagram of a first winding segment (spanning from layer d to layer e) according to some embodiments of the present disclosure;

[0042] Figure 14 is a structural diagram of a first winding segment (spanning from layer f to layer g) according to some embodiments of the present disclosure;

[0043] Figure 15 is a structural diagram of a first winding segment (spanning from the h-th layer to the i-th layer) according to some embodiments of the present disclosure;

[0044] Figure 16 is a structural diagram of a third winding segment according to some embodiments of the present disclosure;

[0045] Figure 17 is another structural diagram of a stator assembly according to some embodiments of the present disclosure;

[0046] Figure 18 is another structural diagram of a stator assembly according to some embodiments of the present disclosure;

[0047] Figure 19 is another structural diagram of a stator assembly according to some embodiments of the present disclosure;

[0048] Figure 20 is a U-phase wiring diagram according to some embodiments of the present disclosure;

[0049] Figure 21 is a V-phase wiring diagram according to some embodiments of the present disclosure;

[0050] Figure 22 is a W-phase wiring diagram according to some embodiments of the present disclosure;

[0051] Figure 23 is a three-phase wiring diagram of the stator winding according to some embodiments of the present disclosure;

[0052] Figures 24A-24F are wiring diagrams of the six branches of the U phase of the stator winding according to some embodiments of the present disclosure;

[0053] Figure 25 is a waveform diagram of the U-phase branch current according to some embodiments of the present disclosure;

[0054] Figure 26 is a block diagram of a motor according to some embodiments of the present disclosure;

[0055] Figure 27 is a block diagram of an electric powertrain according to some embodiments of the present disclosure;

[0056] Figure 28 is a block diagram of a vehicle according to some embodiments of the present disclosure; and

[0057] Figure 29 is another block diagram of a vehicle according to some embodiments of the present disclosure.

[0058] Reference numerals: Vehicle 1000; Electric assembly 500; Motor 200; Stator assembly 100; Slot area per pole per phase 10; Stator core 1; Stator slot 11; Slot layer 12; Slot layer group 13; First slot layer group 13a; Second slot layer group 13b; Intermediate slot layer group 13c; First intermediate slot layer group 131; Second intermediate slot layer group 132; Stator winding 2; Winding group 2a; First winding segment 21; Second winding segment 22; Third winding segment 23; First bend portion 211; First slot inner portion 212; First connecting portion 214; Second bend portion 221; Second slot inner portion 222; Second connecting portion 224; Third bend portion 231; Third slot inner portion 232; Third connecting portion 234; Branch 4; First end 4a; Second end 4b; Lead-out wire 41; Star wire 42; Wiring structure 5. Detailed Implementation

[0059] The embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this disclosure, and should not be construed as limiting this disclosure.

[0060] The following disclosure provides numerous different embodiments or examples for implementing various structures of this disclosure. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this disclosure. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplicity and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this disclosure; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0061] In related technologies, an unreasonable winding method for the stator winding of an electric motor can affect the performance of the motor and the vehicle.

[0062] Hereinafter, with reference to the accompanying drawings, a stator assembly 100 according to an embodiment of the present disclosure is described, which is suitable for a motor with z slots, 2p poles, and m phases, wherein y = z / (2p) and the number of slots per pole per phase is q = z / m / (2p).

[0063] It should be explained that z is the number of stator slots 11, m is the number of phases, and 2p is the number of poles. For example, z can be 24, 48, 72, etc., the number of phases m can be three-phase, two-phase, or single-phase, etc., and the number of pole pairs p can be 8 poles, 4 poles, etc., which can be set according to the specific motor.

[0064] As shown in Figures 1-6, the stator assembly 100 includes a stator core 1, which has a plurality of stator slots 11 spaced apart circumferentially along the stator core 1. Each of the plurality of stator slots 11 has a plurality of slot layers 12 arranged radially along the stator core 1. As shown in Figure 7, the same slot layer 12 of the plurality of stator slots 11 forms a slot layer group 13. The slot layer group 13 includes a first slot layer group 13a, a second slot layer group 13b, and a plurality of intermediate slot layer groups 13c, which are located between the first slot layer group 13a and the second slot layer group 13b. As can be seen, the multiple slot layers 12 of each stator slot 11 may include a first slot layer, a second slot layer and multiple intermediate slot layers. The first slot layers of the multiple stator slots 11 of the stator core 1 can form a first slot layer group 13a, the second slot layers of the multiple stator slots 11 of the stator core 1 can form a second slot layer group 13b, and the same intermediate slot layer of the multiple stator slots 11 of the stator core 1 can form a group of intermediate slot layers 13c.

[0065] In some embodiments, one of the first slot layer group 13a and the second slot layer group 13b is the innermost slot layer group, and the other of the first slot layer group 13a and the second slot layer group 13b is the outermost slot layer group. The plurality of slot layers 12 of each stator slot 11 may include an innermost slot layer, an outermost slot layer, and a plurality of intermediate slot layers. The innermost slot layer can be understood as the slot layer 12 closest to the central axis of the stator core 1 in the radial direction of the stator core 1, and the outermost slot layer can be understood as the slot layer 12 farthest from the central axis of the stator core 1 in the radial direction of the stator core 1. The innermost slot layers of the plurality of stator slots 11 of the stator core 1 can form an innermost slot layer group, and the outermost slot layers of the plurality of stator slots 11 of the stator core 1 can form an outermost slot layer group.

[0066] In the following description of this disclosure, the first groove layer group 13a is used as the innermost groove layer group and the second groove layer group 13b is used as the outermost groove layer group as an example. Of course, the following embodiments of this disclosure are also applicable when the second groove layer group 13b is the innermost groove layer group and the first groove layer group 13a is the outermost groove layer group.

[0067] It should be noted that in the description of some embodiments of this disclosure, "axial" refers to the direction of extension of the central axis of the stator core 1, "radial" refers to the direction in the radial plane of the stator core 1 that passes through the central axis of the stator core 1, the radial plane is perpendicular to the axial direction, and "circumferential" refers to the direction around the central axis of the stator core 1.

[0068] As shown in Figures 1, 3, and 4, the stator assembly 100 further includes a stator winding 2, which is disposed on the stator core 1. The stator winding 2 includes at least one first winding segment 21, and any one of the first winding segments 21 spans y1 stator slots 11 of the plurality of stator slots 11. As shown in Figures 13 and 14, each first winding segment 21 includes two first slot inner portions 212, and the two first slot inner portions 212 of each first winding segment 21 are respectively located in adjacent intermediate slot layer groups 13c of the plurality of intermediate slot layer groups 13c. That is, the slot layers 12 where the two first slot inner portions 212 are located are both located in intermediate slot layers, and these two intermediate slot layers are connected. In other words, the two first slot inner portions 212 are located in two adjacent intermediate slot layers of different stator slots 11. That is, if the multiple slot layers 12 are arranged sequentially from the inside to the outside or from the outside to the inside along the radial direction of the stator core 1, then the multiple intermediate slot layers 12 are all the slot layers 12 between the second slot layer 12 and the second to last slot layer 12 (including the second slot layer and the second to last slot layer), and the values ​​of the slot layers 12 where the two first slot inner portions 212 are located differ by 1. Wherein, y1 satisfies: y-x1-(q-1)≤y1≤y-x1+(q-1), x1 is a positive integer and x1<q.

[0069] Furthermore, the first winding segment 21 spans y1 stator slots 11, meaning the span of the first winding segment 21 is y1. If the multiple stator slots 11 are arranged sequentially in a clockwise or counterclockwise direction, and one of the two first slot inner portions 212 of the first winding segment 21 is located in the y11th slot and the other first slot inner portion 212 is located in the y12th slot, then the first winding segment 21 spans (y12-y11) stator slots 11, i.e., y1 = y12 - y11.

[0070] Since y - x1 - (q - 1) ≤ y1 ≤ y - x1 + (q - 1) and x1 < q, the stator winding 2 can be wound in a "short-pitch plus cross-layer" manner in at least a portion of the intermediate slot layer group 13c. This can effectively suppress harmonic electromagnetic excitation generated by the circulating current, such as eliminating the 5th or 7th harmonics in the magnetic field. This effectively suppresses motor vibration or noise, for example, it can effectively suppress the 24th order torque pulsation of the motor, which is beneficial to improving the noise, vibration, and harshness (NVH) performance of the vehicle. The first winding segment 21 can have various span options. The stator winding 2 can be wound using a single span first winding segment 21 or multiple span first winding segments 21. This gives the stator winding 2 a variety of flexible structures, which is beneficial to improving the adaptability of the stator assembly 100 to meet different motor requirements.

[0071] In some embodiments, the stator winding 2 (e.g., a wire-insertion shaped stator winding) can be a flat wire winding, for example, the first winding segment 21 is configured as a hairpin. This facilitates the arrangement of the stator winding 2, simplifies the assembly of the stator assembly 100, and improves assembly efficiency. For example, the flat wire winding has a suitable aspect ratio and a small thickness, which facilitates the sequential arrangement of the flat wire winding in the stator slot 11 and helps to appropriately reduce the radial dimension of the stator assembly 100.

[0072] In some embodiments, the windings in the first slot group 13a and the second slot group 13b use the windings of the same slot 12 (e.g., same-layer crossing), and the first winding segment 21 of the intermediate slot group 13c uses the windings of two adjacent slots 12 (e.g., crossing of adjacent two-sided slots 12). The multiple first winding segments 21 corresponding to the intermediate slot group 13c are wound in a lap winding manner, which simplifies the arrangement of the stator winding 2 and effectively reduces the height of the stator winding 2 at the axial end of the stator core 1. In addition, when each phase winding of the stator winding 2 includes multiple branches, when it is necessary to adjust the number of branches of each phase winding in the future, a large amount of modification of the winding segments (e.g., the first winding segment 21, the second winding segment 22 and the third winding segment 23 mentioned below) can be avoided, which helps to reduce the adjustment difficulty of the stator winding 2.

[0073] In some embodiments, referring to Figures 5 and 6, the stator core 1 includes an annular stator yoke and a plurality of stator teeth. The plurality of stator teeth are arranged circumferentially at intervals along the stator yoke, and the stator teeth are connected to the inner or outer circumferential surface of the stator yoke. A stator slot 11 is formed between two adjacent stator teeth. The stator core 1 has a plurality of stator slots 11 arranged circumferentially at intervals along the stator core 1. The plurality of stator slots 11 are sequentially designated as slot 1, slot 2, ..., slot (n-1), and slot n. Each stator slot 11 has a plurality of slot layers 12 arranged radially along the stator core 1. The plurality of slot layers 12 are designated as layer a, layer b (i.e., layer (a+1)), ..., layer j, ..., layer r in the direction from the inner side to the outer side of the stator core 1. Layer a is the innermost slot layer, layer r is the outermost slot layer, and layers b to (r-1) are a plurality of intermediate slot layers. In other words, layer a is the groove opening layer and layer r is the groove bottom layer, or layer a is the groove bottom layer and layer r is the groove opening layer.

[0074] In the above technical solution, by setting the two first slot portions 212 of the first winding segment 21 to be located in two adjacent intermediate slot layer groups 13c, and the span y1 of the first winding segment 21 satisfies: y-x1-(q-1)≤y1≤y-x1+(q-1), where x1 is a positive integer and x1<q, at least a portion of the stator winding 2 can be wound in the intermediate slot layer group 13c using a "short-pitch plus cross-layer" method, which can effectively suppress the harmonic electromagnetic excitation generated by the circulating current, such as eliminating the 5th or 7th harmonic in the magnetic field, thereby effectively suppressing the occurrence of motor vibration or noise, which is beneficial to improving the NVH effect of the vehicle; and it is also convenient to realize different short-pitch winding settings of the stator winding 2, which is beneficial to improving the adaptability of the stator assembly 100.

[0075] In some embodiments of this disclosure, the plurality of slot layers 12 includes at least 10 slot layers 12. For example, if the intermediate slot layer group 13c has at least 8 slot layers 12, then the intermediate slot layer group 13c can be arranged with at least four first winding segments 21. In this way, the stator core 1 can provide more arrangement space for the stator winding 2, thereby allowing the stator winding 2 to have multiple turns, which is beneficial to increasing the arrangement density of the stator winding 2, increasing the power of the motor, and facilitating the realization of ultra-high power.

[0076] In some embodiments, each phase of the stator winding 2 may include multiple branches 4, and each branch 4 of each phase includes multiple first winding segments 21 connected in series. For example, at least two of the multiple first winding segments 21 are connected in series radially along the stator core 1. Thus, the stator winding 2 can have multiple phases, and each phase winding can have multiple branches 4 arranged in parallel, thereby increasing the winding density of the stator winding 2 and improving the motor power. Furthermore, when each branch 4 of each phase winding includes multiple first winding segments 21, for example, when each branch 4 of the stator winding 2 has a large number of turns, the motor power can be further increased, facilitating the implementation of ultra-high power settings for the motor.

[0077] In some embodiments of this disclosure, referring to Figures 1 and 12-15, each phase of the stator winding 2 includes multiple branches 4. Each branch 4 includes multiple first winding segments 21 arranged radially along the stator core 1. The corresponding first slot portions 212 of two adjacent first winding segments 21 are located in the same stator slot 11; that is, one first slot portion 212 of two adjacent first winding segments 21 is in the same stator slot 11, and the other first slot portion 212 is also in the same stator slot 11. Each of the two first slot portions 212 has two first connecting portions 214 at one end. The two first connecting portions 214 of each first winding segment 21 extend circumferentially toward each other. The corresponding first connecting portions 214 of two adjacent first winding segments 21 are connected, so that the adjacent first winding segments 21 are connected in series. Therefore, the first winding segments 21 arranged in sequence along the radial direction of the stator core 1 adopt a short-pitch overlapping wiring method, which facilitates the connection (e.g., welding) of two adjacent first winding segments 21. This can effectively reduce the end height of the stator winding 2, save the axial space occupied by the stator assembly 100, and help reduce the material usage of the stator winding 2, which can reduce the resistance of the stator winding 2 and improve the performance and efficiency of the motor.

[0078] In some embodiments of this disclosure, y1 satisfies: y1 + x1 = y. Therefore, the span of the first winding segment 21 is y1 = y - x1. Since the span of the first winding segment 21 is less than y, at least a portion of the stator winding 2 in the intermediate slot layer group 13c has a span between the (a+1)th and (r-1)th layers corresponding to the stator slot 11 reduced from y to (y - x1). This can reduce the height of the stator winding 2 at one end on the axial side of the stator core 1 (e.g., the height of the hairpin end or the welding end; for example, the height of the welding end can be reduced by 8-10 mm), thereby reducing the material usage (e.g., the amount of copper) and resistance of the stator winding 2, which is beneficial for improving the performance and efficiency of the motor.

[0079] In some embodiments of this disclosure, referring to Figures 8 and 9, at least one first winding segment 21 includes multiple first winding segments 21, with equal spans between the multiple first winding segments 21. This facilitates consistent wiring of the stator winding 2 in the intermediate slot layer group 13c, reducing the difficulty of arranging the stator winding 2. Furthermore, since the multiple first winding segments 21 of the stator winding 2 in the intermediate slot layer group 13c have the same span, it is easy to ensure that the ends of the multiple first winding segments 21 located on one axial side of the stator core 1 are at the same height. This allows the ends of the stator winding 2 located on one axial side of the stator core 1 to be at the same height, which helps to reduce the axial length of the stator assembly 100 and facilitates a reduction in the axial dimension of the motor.

[0080] In some embodiments, the span y1 of the multiple first winding segments 21 of the stator winding 2 all satisfy: y1+x1=y.

[0081] Of course, in other embodiments, the spans of the multiple first winding segments 21 of the stator winding 2 may not be completely equal, as long as the span of each first winding segment 21 satisfies y-x1-(q-1)≤y1≤y-x1+(q-1). For example, each phase of the stator winding 2 includes at least one winding group 2a, and each winding group 2a includes multiple first winding segments 21 arranged in series along the radial direction of the stator core 1, with equal spans of the multiple first winding segments 21. When each phase of the stator winding 2 includes multiple winding groups 2a, the spans of the first winding segments 21 of the multiple winding groups 2a may be equal or unequal.

[0082] In some embodiments of this disclosure, each phase of the stator winding 2 includes multiple branches 4, and each branch 4 includes multiple first winding segments 21. The span of the first winding segments 21 of different branches 4 is equal, which facilitates the consistency of the arrangement of each phase of the stator winding 2 and helps to reduce the difficulty of arranging the stator winding 2. In addition, since the span of the first winding segments 21 of different branches 4 is equal, the span of multiple first winding segments 21 of the same branch 4 can be equal, which makes it easy to make the ends of multiple first winding segments 21 located on the axial side of the stator core 1 have the same height. This makes the ends of the stator winding 2 located on the axial side of the stator core 1 have the same height, which helps to reduce the axial length of the stator assembly 100 and facilitates the reduction of the axial dimension of the motor.

[0083] Of course, in other embodiments, the span of the first winding segment 21 of different branches 4 may be unequal. In this case, for the same branch 4, the span of multiple first winding segments 21 may be equal or unequal.

[0084] For example, referring to Figures 8 and 9, multiple first winding segments 21 connected in series radially along the stator core 1 constitute a winding group 2a. Each phase of the stator winding 2 includes multiple winding groups 2a, which can be spaced circumferentially. The spans of the first winding segments 21 in different winding groups 2a may be equal or unequal. Therefore, when the spans of the first winding segments 21 in different winding groups 2a are equal, it simplifies the winding difficulty of the stator winding 2 and facilitates ensuring that the spans of all first winding segments 21 in the intermediate slot layer 12 are equal, which helps reduce the number of processing equipment and achieve mass production. When the spans of the first winding segments 21 in different winding groups 2a are unequal, winding groups 2a with different spans belonging to the same phase and branch 4 can be connected in series, which helps adapt to the winding requirements of the stator winding 2 and facilitates the setup of the stator winding 2.

[0085] For example, referring to Figures 3, 5, and 7-9, in each phase winding, multiple first winding segments 21 located at slots 12 and 22 respectively can be connected in series to form a first winding group. Multiple first winding segments 21 located at slots 14 and 24 respectively (i.e., the two inner portions 212 of each first winding segment 21 located in slots 14 and 24 respectively) can be connected in series to form a second winding group. In this case, the span of the first winding segment 21 in the first winding group is equal to the span of the first winding segment 21 in the second winding group. The first and second winding groups can be connected in series in the same branch 4 of the same phase.

[0086] In other embodiments, in each phase winding, multiple first winding segments 21 located at slots 12 and 24 respectively can be connected in series to form a third winding group. Multiple first winding segments 21 located at slots 14 and 22 respectively (i.e., the inner portions 212 of the two first slots of each first winding segment 21 are located at slots 14 and 22 respectively) can be connected in series to form a fourth winding group. In this case, the span of the first winding segment 21 in the third winding group is not equal to the span of the first winding segment 21 in the fourth winding group. The third and fourth winding groups can be connected in series in the same branch 4 of the same phase.

[0087] In some embodiments of this disclosure, as shown in FIG7, the plurality of intermediate slot layer groups 13c include at least one first intermediate slot layer group 131 and at least one second intermediate slot layer group 132 arranged radially along the stator core 1. That is, each intermediate slot layer group 13c of a portion of the plurality of intermediate slot layer groups 13c is a first intermediate slot layer group 131, and each intermediate slot layer group 13c of a portion of the plurality of intermediate slot layer groups 13c is a second intermediate slot group 132. Within the same magnetic pole, the in-phase windings of the stator winding 2 located in at least one first intermediate slot layer group 131 and at least one second intermediate slot layer group 132 are circumferentially offset by x1 stator slots 11.

[0088] Let x adjacent stator slots 11 corresponding to each pole and each phase winding be the pole and each phase slot region 10. Multiple pole and each phase slot regions 10 can be spaced apart in the circumferential direction of the stator core 1. Each phase winding corresponds to at least two pole and each phase slot regions 10 on the stator core 1, and the two pole and each phase slot regions 10 are spaced apart by (y-x1) stator slots 11. The two first slot portions 212 of the first winding segment 21 are respectively located in two adjacent per-pole per-phase slot regions 10. One of the first slot portions 212 of the first winding segment 21 is located in one of the stator slots 11 in the first intermediate slot layer group 131 of one of the multiple per-pole per-phase slot regions 10. The other first slot portion 212 of the first winding segment 21 is located in one of the stator slots 11 in the second intermediate slot layer group 132 of another of the multiple per-pole per-phase slot regions 10. The two ends of the first winding segment 21 are respectively located in the adjacent first intermediate slot layer group 131 and second intermediate slot layer group 132.

[0089] For example, referring to Figures 6-9 and 12-15, taking a stator core 1 having 72 stator slots 11 and each stator slot 11 having 10 slot layers 12 as an example, the 10 slot layers 12 include layers a, b, c, d, e, f, g, h, i, and j arranged sequentially along the radial inner side to the outer side of the stator core 1. Among them, a is the slot layer 12 closest to the slot opening of the stator slot 11 (i.e., the slot layer 12 furthest from the stator yoke, the slot opening layer), and j is the slot layer 12 closest to the bottom of the stator slot 11 (i.e., the slot layer 12 closest to the stator yoke, the slot bottom layer). Each phase winding has six per-pole per-phase slot regions 10 equidistantly arranged circumferentially, and each per-pole per-phase winding is located within six adjacent stator slots 11 (i.e., x = 6). The same slot layer 12 of the six adjacent stator slots 11 is a slot layer group 13. Thus, each per-pole per-phase slot region 10 can have five first intermediate slot layer groups 131 and five second intermediate slot layer groups 132. In each phase winding of the stator winding 2, the winding segment of the first intermediate slot layer group 131 and the winding segment of the second intermediate slot layer group 132 are offset circumferentially by two stator slots 11 (i.e., x1 = 2), so that in each phase winding, the first intermediate slot layer group 131 and the second intermediate slot layer group 132 each have four stator slots 11. In the six adjacent stator slots 11 corresponding to each phase winding of each pole, the middle two stator slots 11 are filled with 10 layers of winding segments from the first intermediate slot layer group 131 and the second intermediate slot layer group 132. On one side of the circumference of the two middle stator slots 11, a portion of the winding segments from the first intermediate slot layer group 131 corresponding to the in-phase winding is provided. On the other side of the circumference of the two middle stator slots 11, a portion of the winding segments from the second intermediate slot layer group 132 corresponding to the in-phase winding is provided.

[0090] The following describes the configuration of stator winding 2 using the example of corresponding poles and phases located in slots 10 to 15 and corresponding poles and phases located in slots 22 to 27. Slots 10a, 11a, 12a, and 13a constitute the first intermediate slot layer group 131. Slots 22a, 23a, 24a, and 25a also constitute the first intermediate slot layer group 131. Slot 10c... Slots 11, 12, and 13 form a first intermediate slot layer group 131; slots 22, 23, 24, and 25 form a first intermediate slot layer group 131; slots 12, 13, 14, and 15 form a second intermediate slot layer group 132; and slots 24, 25, 26, and 27 form a second intermediate slot layer group 132. Each phase winding includes multiple first winding segments 21, with both ends of each segment located in one slot layer 12 of the first intermediate slot layer group 131 and one slot layer 12 of the second intermediate slot layer group 132, which are adjacent in the circumferential direction. The first intermediate slot layer group 131 and the second intermediate slot layer group 132 are two intermediate slot layer groups 13 that are radially adjacent in the stator core 1.

[0091] For example, one end of a first winding segment 21 is located in the b-th layer of slot 12, and the other end is located in the c-th layer of slot 22; one end of a first winding segment 21 is located in the b-th layer of slot 14, and the other end is located in the c-th layer of slot 24. Thus, the two ends of each first winding segment 21 of each phase winding are located in one of the slot layers 12 of the corresponding first intermediate slot layer group 131 and one of the slot layers 12 of the second intermediate slot layer group 132, and the two ends of each first winding segment 21 are located in two adjacent slot layers 12. This allows each phase winding to be wound around the corresponding slot region 10 of each pole and each phase, that is, each pole and each phase winding of the stator winding 2 is located in six adjacent stator slots 11 to achieve the winding arrangement of each phase winding. The stator winding 2 uses a short-pitch, multi-layer winding method for each phase, which effectively suppresses harmonic electromagnetic excitation generated by the circulating current. For example, it can eliminate the 5th or 7th harmonics in the magnetic field, thereby effectively suppressing motor vibration or noise and improving the vehicle's NVH performance. It is understood that when each phase winding includes multiple branches 4, each branch 4 includes multiple first winding segments 21 connected in series.

[0092] In the above scheme, each pole and each phase of the stator winding 2 is located in x adjacent stator slots 11. In each phase of the stator winding 2, the winding segments of the first intermediate slot layer group 131 and the winding segments of the second intermediate slot layer group 132 are circumferentially offset by x1 stator slots 11, where x1 satisfies q > x1. Therefore, to better meet the requirements of the stator winding 2, it can be understood that in each pole and each phase of the winding, at least one stator slot 11 (e.g., (x-x1) stator slots 11) is filled by both the winding segments of the first intermediate slot layer group 131 and the winding segments of the second intermediate slot layer group 132. That is, the first intermediate slot layer group 131 and the second intermediate slot layer group 132 are not completely offset in the circumferential direction. The first intermediate slot layer group 131 has at least one stator slot 11 that is radially opposite to the second intermediate slot layer group 132 and at least one stator slot 11 that is circumferentially offset from the second intermediate slot layer group 132. In other words, along the radial direction of the stator core 1, the projection of the first intermediate slot layer group 131 overlaps with the projection of the second intermediate slot layer group 132 by at least one stator slot 11. This facilitates ensuring that each phase winding has a suitable span to eliminate harmonic electromotive force, thereby ensuring that the stator winding 2 can effectively suppress harmonic electromagnetic excitation generated by circulating current.

[0093] In some embodiments, x = q + x1, which helps to further improve the wiring consistency and convenience of stator winding 2.

[0094] In some embodiments of this disclosure, referring to FIG7, there are multiple first intermediate slot layer groups 131 and multiple second intermediate slot layer groups 132. The circumferential ends of the winding segments of the multiple first intermediate slot layer groups 131 are aligned, and the circumferential ends of the winding segments of the multiple second intermediate slot layer groups 132 are aligned. Thus, the number of stator slots 11 with circumferential misalignment in each first intermediate slot layer group 131 and each second intermediate slot layer group 132 is the same, which facilitates the setting of the first winding segment 21 for each phase winding, simplifies the winding difficulty of the stator winding 2, achieves consistency in the arrangement of each phase winding, and improves the performance of the stator winding 2. For example, in the x adjacent stator slots 11 corresponding to each pole and each phase winding, the number of first intermediate slot layer groups 131 and the number of second intermediate slot layer groups 132 can be equal.

[0095] It is understood that each group of first intermediate groove layers 131 includes multiple groove layers 12 arranged sequentially along the circumference. The groove layers 12 on both sides of the multiple groups of first intermediate groove layers 131 are aligned, and the groove layers 12 on both sides of the multiple groups of first intermediate groove layers 131 are respectively located in the same stator groove. Each group of second intermediate groove layers 132 includes multiple groove layers 12 arranged sequentially along the circumference. The groove layers 12 on both sides of the multiple groups of second intermediate groove layers 132 are aligned, and the groove layers 12 on both sides of the multiple groups of second intermediate groove layers 131 are respectively located in the same stator groove.

[0096] For example, referring to Figure 7, each pole of the U-phase winding is disposed in six adjacent stator slots 11. The six adjacent stator slots 11 have 10 slot layer groups 13, including five first intermediate slot layer groups 131 and five second intermediate slot layer groups 132. For the U-phase winding, each first intermediate slot layer group 131 and each second intermediate slot layer group 132 has four slot layers 12. That is, the U-phase winding occupies four slot layers 12 in the first intermediate slot layer group 131 and four slot layers 12 in the second intermediate slot layer group 132.

[0097] In some embodiments of this disclosure, at least one first intermediate slot layer group 131 includes multiple first intermediate slot layer groups 131, and at least one second intermediate slot layer group 132 includes multiple second intermediate slot layer groups 132. The multiple first intermediate slot layer groups 131 are arranged adjacently to form a first intermediate slot layer unit, and the multiple second intermediate slot layer groups 132 are arranged adjacently to form a second intermediate slot layer unit. The first intermediate slot layer units and the second intermediate slot layer units are alternately arranged along the radial direction of the stator core 1; or, the multiple first intermediate slot layer groups 131 and the multiple second intermediate slot layer groups 132 are alternately arranged along the radial direction of the stator core 1. Therefore, the stator winding 2 has multiple arrangement methods, allowing the stator winding 2 to have various structures to adapt to the needs of the motor.

[0098] In some embodiments, multiple sets of first intermediate slot layer groups 131 are arranged adjacently to form a first intermediate slot layer unit, and multiple sets of second intermediate slot layer groups 132 are arranged adjacently to form a second intermediate slot layer unit. The first intermediate slot layer units and the second intermediate slot layer units are arranged alternately along the radial direction of the stator core 1. In this case, no second intermediate slot layer group 132 is provided between two adjacent first intermediate slot layer groups 131 in the radial direction of the stator core 1, and no first intermediate slot layer group 131 is provided between two adjacent second intermediate slot layer groups 132. In addition, when there are multiple first intermediate slot layer units and multiple second intermediate slot layer units, a second intermediate slot layer unit is provided between two adjacent first intermediate slot layer units, and a first intermediate slot layer unit is provided between two adjacent second intermediate slot layer units.

[0099] For example, taking a set of first intermediate slot layer units and a set of second intermediate slot layer units arranged radially adjacent to each other along the stator core 1 as an example, each phase winding of the stator winding 2 includes two per-pole per-phase windings. Each per-pole per-phase winding is respectively arranged in x adjacent stator slots 11. Each x adjacent stator slots 11 has a set of first intermediate slot layer units and a set of second intermediate slot layer units. The first intermediate slot layer unit includes three first intermediate slot layer groups 131 arranged sequentially adjacent to each other, and the second intermediate slot layer unit includes three second intermediate slot layer groups 132 arranged sequentially adjacent to each other. In the direction from the inner side to the outer side of the stator core 1, the three first intermediate slot layer groups 131 are respectively the first first intermediate slot layer group 131, the second first intermediate slot layer group 131, and the third first intermediate slot layer group 131, and the three second intermediate slot layer groups 132 are respectively the first second second intermediate slot layer group 132, the second second intermediate slot layer group 132, and the third second second intermediate slot layer group 132.

[0100] Therefore, the six adjacent stator slots 11 corresponding to each pole and phase winding are denoted as a pole and phase slot region 10, which facilitates the same arrangement area of ​​the same phase winding segments in any two adjacent pole and phase slot regions 10. In each phase winding of the stator winding 2, one end of the first winding segment 21 is located in the slot layer 12 of the second first intermediate slot layer group 131 of one of the two adjacent pole and phase slot regions 10, and the other end of the first winding segment 21 is located in the slot layer 12 of the third first intermediate slot layer group 131 of the other pole and phase slot region 10. One end of the second winding segment 21 is located in the slot layer 12 of the third first intermediate slot layer group 131 of the aforementioned pole and phase slot region 10, and the other end of the second winding segment 21 is located in the slot layer 12 of the first second intermediate slot layer group 132 of the aforementioned other pole and phase slot region 10. One end of the third part, the first winding segment 21, is located within the slot layer 12 of the first second intermediate slot layer group 132 in the aforementioned per-pole per-phase slot region 10, and the other end of the third part, the first winding segment 21, is located within the slot layer 12 of the second second intermediate slot layer group 132 in the aforementioned other per-pole per-phase slot region 10. Similarly, it can be understood that the first intermediate slot layer unit and the second intermediate slot layer unit are arranged alternately along the radial direction of the stator core 1.

[0101] In some embodiments, referring to FIG7, the first intermediate slot layer group 131 and the second intermediate slot layer group 132 are alternately arranged along the radial direction of the stator core 1. In this case, there can be one or more first intermediate slot layer groups 131 and one or more second intermediate slot layer groups 132. Example 1: There are multiple first intermediate slot layer groups 131 and multiple second intermediate slot layer groups 132. A second intermediate slot layer group 132 is provided between two adjacent first intermediate slot layer groups 131 in the radial direction of the stator core 1, and a first intermediate slot layer group 131 is provided between two adjacent second intermediate slot layer groups 132. Example 2: There is one first intermediate slot layer group 131 and multiple second intermediate slot layer groups 132 arranged sequentially along the radial direction of the stator core 1. The first intermediate slot layer group 131 is located between two adjacent second intermediate slot layer groups 132. Example 3: There is one second intermediate slot layer group 132, and multiple first intermediate slot layer groups 131 arranged sequentially along the radial direction of the stator core 1. The second intermediate slot layer group 132 is located between two adjacent first intermediate slot layer groups 131. Example 4: There is one first intermediate slot layer group 131 and one second intermediate slot layer group 132, both arranged sequentially along the radial direction of the stator core 1. This allows for a smaller distance between the two ends of the first winding segment 21, meaning the two ends of the first winding segment 21 are located in two adjacent slot layers 12, effectively reducing the length of the first winding segment 21 and lowering costs.

[0102] For example, referring to Figures 7 and 8, the windings for each pole and each phase are respectively arranged in six adjacent stator slots 11. Each of the six adjacent stator slots 11 has five first intermediate slot layer groups 131 and five second intermediate slot layer groups 132, and the five first intermediate slot layer groups 131 and five second intermediate slot layer groups 132 are arranged alternately along the radial direction of the stator core 1. Along the radial direction from the inner side to the outer side of the stator core 1, the five first intermediate slot layer groups 131 are the first first intermediate slot layer group 131, the second first intermediate slot layer group 131, the third first intermediate slot layer group 131, the fourth first intermediate slot layer group 131, and the fifth first intermediate slot layer group 131, and the five second intermediate slot layer groups 132 are the first second second intermediate slot layer group 132, the second second second intermediate slot layer group 132, the third second second intermediate slot layer group 132, the fourth second second intermediate slot layer group 132, and the fifth second intermediate slot layer group 132.

[0103] Therefore, the six adjacent stator slots 11 corresponding to each pole and phase winding are denoted as a pole and phase slot region 10. This facilitates the same arrangement area of ​​the winding segments of the same phase in any two adjacent pole and phase slot regions 10. In two adjacent pole and phase slot regions 10, one end of the first winding segment 21 is located in the slot layer 12 of the first second intermediate slot layer group 132 of one pole and phase slot region 10, and the other end of the first winding segment 21 is located in the slot layer 12 of the second first intermediate slot layer group 131 of the other pole and phase slot region 10. One end of the second winding segment 21 is located in the slot layer 12 of the second second intermediate slot layer group 132 of the aforementioned pole and phase slot region 10, and the other end of the second winding segment 21 is located in the slot layer 12 of the third first intermediate slot layer group 131 of the aforementioned other adjacent pole and phase slot region 10. One end of the third first winding segment 21 is located within the slot layer 12 of the third second intermediate slot layer group 132 of the aforementioned per-pole per-phase slot region 10, and the other end of the third first winding segment 21 is located within the slot layer 12 of the fourth first intermediate slot layer group 131 of the aforementioned other adjacent per-pole per-phase slot region 10. One end of the fourth first winding segment 21 is located within the slot layer 12 of the fourth second intermediate slot layer group 132 of the aforementioned per-pole per-phase slot region 10, and the other end of the fourth first winding segment 21 is located within the slot layer 12 of the fifth first intermediate slot layer group 131 of the aforementioned other adjacent per-pole per-phase slot region 10.

[0104] In some embodiments of this disclosure, referring to Figures 8-9, 10-11 and 16, the stator winding 2 further includes at least one second winding segment 22. Any one of the at least one second winding segment 22 spans y2 stator slots 11, and any one second winding segment 22 includes two inner portions 222 of the second slots. Both inner portions 222 of the second winding segment 22 are located in the first slot layer group 13a, and y2 satisfies: y-(q-1)≤y2≤y+(q-1).

[0105] The second winding segment 22 spans y2 stator slots 11, that is, the span of the second winding segment 22 is y2. If the multiple stator slots 11 are arranged in a clockwise or counterclockwise direction, the inner part 222 of one second slot of the second winding segment 22 is located in the y21st slot, and the inner part 222 of another second slot of the second winding segment 22 is located in the y22nd slot. Then the second winding segment 22 spans (y22-y21) stator slots 11, that is, y2 = y22-y21.

[0106] In the above technical solution, by setting the span of the second winding segment 22 to a value between y-(q-1) and y+(q-1), the second winding segment 22 can have multiple selections of span while adapting to short-pitch winding, so as to better adapt to the span of the first winding segment 21, so as to realize the arrangement of each phase winding, which is conducive to realizing the multi-path arrangement of each phase winding and improving the applicability of the stator assembly 100; and it is also convenient to realize different settings of the stator winding 2 lead wire 41 or star line 42 through the second span segment 22.

[0107] In some embodiments of this disclosure, q ≥ 4, and each phase of the stator winding 2 includes multiple second winding segments 22. At least one of the multiple second winding segments 22 has a span y2 = y - (q - 1), and at least one of the remaining second winding segments 22 has a span y2 = y + (q - 3). Therefore, the second winding segments 22 located in the first slot group 13a in each phase winding include at least two types, meaning that a connection with the first winding segment 21 can be achieved through at least two types of second winding segments 22. Specifically, the second winding segments 22 in the first slot group 13a are connected to the first winding segments 21 in the adjacent intermediate slot group 13c. Furthermore, having fewer types of second winding segments 22 reduces the number of winding segments in the stator winding 2, which helps reduce the assembly difficulty of the stator winding 2 and facilitates mass production of the stator winding 2.

[0108] In some embodiments of this disclosure, referring to Figures 8-9, 10-11 and 16, the stator winding 2 further includes at least one third winding segment 23. Any one of the at least one third winding segment 23 spans y3 stator slots 11. Any one of the third winding segments 23 includes two inner portions 232 of the third slots, and both inner portions 232 of the third winding segment 23 are located in the second slot layer group 13b. y3 satisfies: y-(q-1)≤y3≤y+(q-1).

[0109] The third winding segment 23 spans y3 stator slots 11, that is, the span of the third winding segment 23 is y3. If the multiple stator slots 11 are arranged in a clockwise or counterclockwise direction, the inner part 232 of the third slot in the second winding segment 22 is located in the y31st slot, and the inner part 232 of the second slot in the second winding segment 22 is located in the y32nd slot. Then the second winding segment 22 spans (y32-y31) stator slots 11, that is, y3 = y32-y31.

[0110] In the above technical solution, by setting the span of the third winding segment 23 to a value between y-(q-1) and y+(q-1), the span of the third winding segment 23 can have multiple options under the premise of adapting to short-pitch winding, so as to better adapt to the span of the first winding segment 21, so as to realize the arrangement of each phase winding, which is conducive to realizing the multi-path arrangement of each phase winding and improving the applicability of the stator assembly 100; and it is also convenient to realize different settings of the stator winding 2 lead wire 41 or star line 42 through the third winding segment 23.

[0111] For example, referring to Figures 3, 8 and 9, each phase of the stator winding 2 includes a first winding segment 21, a second winding segment 22 and a third winding segment 23. Multiple first winding segments 21 connected in series radially along the stator core 1 constitute a winding group 2a. Each phase of the stator winding 2 includes multiple winding groups 2a, and each winding group 2a is located in the slot layer 12 between the innermost slot layer 12 and the outermost slot layer 12. The first winding segment 21 is a cross-layer (crossing two adjacent slot layers 12). Each winding group 2a winds from the radial outer side to the radial inner side of the stator core 1. The two inner portions 222 of the second slot of the second winding segment 22 are both located in the innermost slot layer 12, and the two inner portions 232 of the third slot of the third winding segment 23 are both located in the outermost slot layer 12. The second winding segment 22 and the third winding segment 23 are connected across the same layer. Therefore, the two corresponding winding groups 2a can be connected through the second winding segment 22 and the third winding segment 23 to achieve series connection of multiple winding groups 2a, thereby realizing the arrangement of the windings for each phase. It should be noted that the innermost slot layer 12 is the slot opening layer, for example, the innermost slot layer 12 is the a-th layer, and the outermost slot layer 12 is the slot bottom layer, for example, the outermost slot layer 12 is the j-th layer.

[0112] In some embodiments of this disclosure, q ≥ 4, and each phase of the stator winding 2 includes multiple third winding segments 23, the span of which satisfies y3 = y - (q - 3). Therefore, the third winding segment 23 located in the second slot group 13b of each phase winding is of one type, meaning that the connection with the first winding segment 21 is achieved through at least one type of third winding segment 23; that is, the third winding segment 23 in the second slot group 13b is connected to the first winding segment 21 in the adjacent intermediate slot group 13c. Furthermore, having fewer types of third winding segments 23 reduces the number of winding segments in the stator winding 2, which helps reduce the assembly difficulty of the stator winding 2 and facilitates mass production of the stator winding 2.

[0113] In some embodiments, the stator winding 2 includes a first winding segment 21, a second winding segment 22, and a third winding segment 23. The span y1 of the first winding segment 21 satisfies: y-x1-(q-1)≤y1≤y-x1+(q-1), the span y2 of the second winding segment 22 satisfies: y-(q-1)≤y2≤y+(q-1), and the span y3 of the third winding segment 23 satisfies: y-(q-1)≤y3≤y+(q-1). The two second slot portions 222 of the second winding segment 22 are both located in the first slot layer group 13a, and the two third slot portions 232 of the third winding segment 23 are both located in the second slot layer group 13b, or the two second slot portions 222 of the second winding segment 22 are both located in the second slot layer group 13b, and the two third slot portions 232 of the third winding segment 23 are both located in the first slot layer group 13a.

[0114] Where q≥4, the span y2 of at least one of the multiple second winding segments 22 is y-(q-1), the span y2 of at least one of the remaining second winding segments 22 is y+(q-3), and the span y3 of all third winding segments 23 is y-(q-3). For example, when q=4, each phase of the stator winding 2 includes two types of second winding segments 22, the span y2 of one type of second winding segment 22 is y-3, the span y2 of the other type of second winding segment 22 is y+1, and each phase of the stator winding 2 includes one type of third winding segment 23, the span y3 of the third winding segment 23 is y-3.

[0115] As can be seen, in the above scheme, the stator winding 2 can achieve the arrangement of each phase winding by using fewer types of first winding segment 21, second winding segment 22 and third winding segment 23. Moreover, the fewer types of first winding segment 21, second winding segment 22 and third winding segment 23, the fewer types of winding segments of stator winding 2 can be reduced, which is conducive to reducing the assembly difficulty of stator winding 2 and facilitating the mass production of stator winding 2.

[0116] In some embodiments of this disclosure, referring to Figures 7 and 20-22, each phase of the stator winding 2 includes six branches 4. Multiple first winding segments 21, arranged in series radially along the stator core 1, form winding groups 2a. Each phase and each branch of the stator winding 2 includes at least one winding unit arranged in series. Each winding unit includes second winding segments 22 arranged in series, two circumferentially spaced winding groups 2a, and two third winding segments 23. The span of the multiple first winding segments 21 in each winding group 2a can be equal. This facilitates the arrangement of each phase and each branch of the stator winding 2, better adapts to the arrangement requirements of the stator winding 2, and simplifies the arrangement difficulty of the stator winding 2.

[0117] For example, referring to Figures 3 and 7-9, each phase of the stator winding 2 includes 6 branches 4, and each branch 4 includes two winding units connected in series. Each winding unit includes a second winding segment 22 connected in series, two sets of winding groups 2a arranged circumferentially, and two third winding segments 23. Each winding group 2a includes multiple first winding segments 21 connected in series along the radial direction of the stator core 1. Each second winding segment 22 is used to connect the two winding groups 2a of the same winding unit in series. One of the two third winding segments 23 is used to connect a set of windings 2a in one of the two winding units. The other third winding segment 23 is used to connect another set of windings 2a in the aforementioned winding unit and another set of windings 2a in the other winding unit. This makes the connection of the two series-connected winding units as follows: third winding segment 23 → a set of windings 2a → second winding segment 22 → a set of windings 2a → third winding segment 23 → a set of windings 2a → second winding segment 22 → a set of windings 2a. Thus, each phase and each path of the stator winding 2 is wound two turns on the stator core 1 to achieve the arrangement of each phase and each path of the stator winding 2.

[0118] In some embodiments of this disclosure, the span of the first winding segment 21 of the two winding groups 2a in the winding unit is equal. This simplifies the arrangement of the winding unit, and by making the span of the first winding segment 21 of the two winding groups 2 equal, it reduces the types of winding segments in the stator winding 2, thus reducing the assembly difficulty of the stator winding 2 and facilitating mass production of the stator winding 2. Of course, the span of the first winding segment 21 of the two winding groups 2a in the winding unit can also be unequal.

[0119] In some embodiments of this disclosure, referring to Figures 7-9, 20 and 24A-24F, z = 72, 2p = 6, m = 3, q ​​= 4, each stator slot 11 has 10 slot layers 12, the 10 slot layers 12 are layers a-j respectively, the 72 stator slots 11 are slot 1 to slot 72 respectively, and each phase winding of the stator winding 2 includes 6 branches 4. The winding path of the first branch of the first phase of stator winding 2 is as follows: 1j→12j→22i→12h→22g→12f→22e→12d→22c→12b→22a→13a→3b→13c→3d→13e→3f→13g→3h→13i→3j→14j→24i→14h→24g→14f→24e→14d→24c→14b→24a→11a→1b→11c→1d→11e→1f→11g→1h→11i. The winding path of the second branch of the first phase of stator winding 2 is as follows: 2b→12c→2d→12e→2f→12g→2h→12i→2j→63j→1i→63h→1g→63f→1e→63d→1c→63b→1a→10a→72b→10c→72d→10e→72f→10g→72h→10i→72j→61j→71i→61h→71g→61f→71e→61d→71c→61b→71a→12a. The winding path of the third branch of the first phase of stator winding 2 is as follows: 25j→36j→46i→36h→46g→36f→46e→36d→46c→36b→46a→37a→27b→37c→27d→37e→27f→37g→27h→37i→27j→38j→48i→38h→48g→38f→48e→38d→48c→38b→48a→35a→25b→35c→25d→35e→25f→35g→25h→35i.The winding path of the fourth branch of the first phase of stator winding 2 is as follows: 26b→36c→26d→36e→26f→36g→26h→36i→26j→15j→25i→15h→25g→15f→25e→15d→25c→15b→25a→34a→24b→34c→24d→34e→24f→34g→24h→34i→24j→13j→23i→13h→23g→13f→23e→13d→23c→13b→23a→36a; The winding path of the fifth branch of the first phase of stator winding 2 is as follows: 49j→60j→70i→60h→70g→60f→70e→60d→70c→60b→70a→61a→51b→61c→51d→61e→51f→61g→51h→61i→51j→62j→72i→62h→72g→62f→72e→62d→72c→62b→72a→59a→49b→59c→49d→59e→49f→59g→49h→59i. The winding path of the sixth branch of the first phase of stator winding 2 is as follows: 50b→60c→50d→60e→50f→60g→50h→60i→50j→39j→49i→39h→49g→39f→49e→39d→49c→39b→49a→58a→48b→58c→48d→58e→48f→58g→48h→58i→48j→37j→47i→37h→47g→37f→47e→37d→47c→37b→47a→60a. For example, in "1j", the number corresponds to stator slot 11, and the letter corresponds to slot layer 12.

[0120] In some embodiments, referring to Figures 8 and 9, the stator winding 2 includes three phases, the first phase being the U phase of the stator winding 2, and the winding path of the first branch of the U phase of the stator winding 2 is as follows:

[0121] Third winding segment 23 (1j→12j) → First winding segment 21 (22i→12h) → First winding segment 21 (22g→12f) → First winding segment 21 (22e→12d) → First winding segment 21 (22c→12b) → Second winding segment 22 (22a→13a) → First winding segment 21 (3b→13c) → First winding segment 21 (3d→13e) → First winding segment 21 (3f→13g) → First winding segment 21 (3h→13i) → Third winding segment 23 (3j→14j) → First winding segment 21 (24i→14h) → First winding segment 21 (24g→14f) → First winding segment 21 (24e→14d) → First winding segment 21 (24c→14b) → Second winding segment 22 (24a→11a) → First winding segment 21 (1b→11c) → First winding segment 21 (1d→11e) → First winding segment 21 (1f→11g) → First winding segment 21 (1h→11i).

[0122] The winding path of the second branch of phase U of stator winding 2 is as follows:

[0123] First winding segment 21 (2b→12c) → First winding segment 21 (2d→12e) → First winding segment 21 (2f→13g) → First winding segment 21 (2h→12i) → Third winding segment 23 (2j→63j) → First winding segment 21 (1i→63h) → First winding segment 21 (1g→63f) → First winding segment 21 (1e→63d) → First winding segment 21 (1c→63b) → Second winding segment 22 (1a→10a) → First winding segment 21(72b→10c)→First winding segment 21(72d→10e)→First winding segment 21(72f→10g)→First winding segment 21(72h→10i)→Third winding segment 23(72j→61j)→First winding segment 21(71i→61h)→First winding segment 21(71g→61f)→First winding segment 21(71e→61d)→First winding segment 21(71c→61b)→Second winding segment 22(71a→12a).

[0124] The winding route of the third branch of phase U of stator winding 2 is as follows:

[0125] Third winding segment 23 (25j→36j) → First winding segment 21 (46i→36h) → First winding segment 21 (46g→36f) → First winding segment 21 (46e→36d) → First winding segment 21 (46c→36b) → Second winding segment 22 (46a→37a) → First winding segment 21 (27b→37c) → First winding segment 21 (27d→37e) → First winding segment 21 (27f→37g) → First winding segment 21 (27h→37i) →Third winding segment 23 (27j→38j)→First winding segment 21 (48i→38h)→First winding segment 21 (48g→38f)→First winding segment 21 (48e→38d)→First winding segment 21 (48c→38b)→Second winding segment 22 (48a→35a)→First winding segment 21 (25b→35c)→First winding segment 21 (25d→35e)→First winding segment 21 (25f→35g)→First winding segment 21 (25h→35i).

[0126] The winding route of the fourth branch of phase U of stator winding 2 is as follows:

[0127] First winding segment 21 (26b→36c) → First winding segment 21 (26d→36e) → First winding segment 21 (26f→36g) → First winding segment 21 (26h→36i) → Third winding segment 23 (26j→15j) → First winding segment 21 (25i→15h) → First winding segment 21 (25g→15f) → First winding segment 21 (25e→15d) → First winding segment 21 (25c→15b) → Second winding segment 22 (25a→34a) →First winding segment 21 (24b→34c)→First winding segment 21 (24d→34e)→First winding segment 21 (24f→34g)→First winding segment 21 (24h→34i)→Third winding segment 23 (24j→13j)→First winding segment 21 (23i→13h)→First winding segment 21 (23g→13f)→First winding segment 21 (23e→13d)→First winding segment 21 (23c→13b)→Second winding segment 22 (23a→36a).

[0128] The winding route of the fifth branch of phase U of stator winding 2 is as follows:

[0129] Third winding segment 23 (49j→60j) → First winding segment 21 (70i→60h) → First winding segment 21 (70g→60f) → First winding segment 21 (70e→60d) → First winding segment 21 (70c→60b) → Second winding segment 22 (70a→61a) → First winding segment 21 (51b→61c) → First winding segment 21 (51d→61e) → First winding segment 21 (51f→61g) → First winding segment 21 (51h→61i) → Third winding segment 23 (51j→62j) → First winding segment 21 (72i→62h) → First winding segment 21 (72g→62f) → First winding segment 21 (72e→62d) → First winding segment 21 (72c→62b) → Second winding segment 22 (72a→59a) → First winding segment 21 (49b→59c) → First winding segment 21 (49d→59e) → First winding segment 21 (49f→59g) → First winding segment 21 (49h→59i).

[0130] The winding route of the sixth branch of phase U of stator winding 2 is as follows:

[0131] First winding segment 21 (50b→60c) → First winding segment 21 (50d→60e) → First winding segment 21 (50f→60g) → First winding segment 21 (50h→60i) → Third winding segment 23 (50j→39j) → First winding segment 21 (49i→39h) → First winding segment 21 (49g→39f) → First winding segment 21 (49e→39d) → First winding segment 21 (49c→39b) → Second winding segment 22 (49a→58a) →First winding segment 21 (48b→58c)→First winding segment 21 (48d→58e)→First winding segment 21 (48f→58g)→First winding segment 21 (48h→58i)→Third winding segment 23 (48j→37j)→First winding segment 21 (47i→37h)→First winding segment 21 (47g→37f)→First winding segment 21 (47e→37d)→First winding segment 21 (47c→37b)→Second winding segment 22 (47a→60a).

[0132] In some embodiments, the stator winding 2 has a span y = 12, the first winding segment 21 has a span of 10, the second winding segment 22 has two spans of 9 and 13, and the third winding segment 23 has a span of 11. Each phase winding of the stator winding 2 includes 6 branches 4, and in each phase winding, the first branch and the second branch, the third branch and the fourth branch, and the fifth branch and the sixth branch are spatially spaced 120° apart. For example, Figure 25 is a current waveform diagram of the 6 branches 4 of phase U.

[0133] In the U-phase first branch 4 winding route of stator winding 2, two winding units connected in series are provided. Each winding unit includes a second winding segment 22 connected in series, two sets of circumferentially spaced winding groups 2a, and a third winding segment 23. Each winding group 2a includes four first winding segments 21 connected in series along the radial direction of stator core 1. The four winding groups 2a are respectively the first winding group 2a consisting of the first winding segment 21 (22i→12h) → the first winding segment 21 (22g→12f) → the first winding segment 21 (22e→12d) → the first winding segment 21 (22c→12b), and the second winding group 2a consisting of the first winding segment 21 (3b→13c) → the first winding segment 21 (3d→13e) → the first winding segment 21 (3f→13g) → the first winding segment 21 (3h→13i). The third winding group 2a consists of group 2a, the first winding segment 21 (24i→14h) → the first winding segment 21 (24g→14f) → the first winding segment 21 (24e→14d) → the first winding segment 21 (24c→14b), and the fourth winding group 2a consists of the first winding segment 21 (1b→11c) → the first winding segment 21 (1d→11e) → the first winding segment 21 (1f→11g) → the first winding segment 21 (1h→11i). The first winding group 2a and the second winding group 2a correspond to one of the two winding units connected in series, and the third winding group 2a and the fourth winding group 2a correspond to the other winding unit in the two winding units connected in series. One end of the third winding segment 23 (1j→12j) is connected to the first winding group 2a. The two ends of the second winding segment 22 (22a→13a) are connected to the first winding group 2a and the second winding group 2a, respectively. The two ends of the third winding segment 23 (3j→14j) are connected to the second winding group 2a and the third winding group 2a, respectively. The two ends of the second winding segment 22 (24a→11a) are connected to the third winding group 2a and the fourth winding group 2a, respectively. Similarly, the windings of other branches 4 and other phases can also be obtained.

[0134] The above description is for a 72-slot, 10-slot, 12-layer configuration. It also applies to other numbers of slots (e.g., 4, 6, 8, 10, or higher even-numbered layers), which will not be explained in detail here.

[0135] In some embodiments, one end of the winding segment corresponding to 1j, 2b, 25j, 26b, 49j, and 50b can be formed as a lead wire 41. The lead wires 41 corresponding to the first branch of each phase U, V, and W are 8 stator slots 11 apart in the circumferential direction (i.e., 2q stator slots 11). The lead wires 41 corresponding to the second branch of each phase U, V, and W are 8 stator slots 11 apart in the circumferential direction. The lead wires 41 corresponding to the third branch of each phase U, V, and W are 8 stator slots 11 apart in the circumferential direction. The lead wires 41 corresponding to the fourth branch of each phase U, V, and W are 8 stator slots 11 apart in the circumferential direction. The lead wires 41 corresponding to the fifth branch of each phase U, V, and W are 8 stator slots 11 apart in the circumferential direction. The lead wires 41 corresponding to the sixth branch of each phase U, V, and W are 8 stator slots 11 apart in the circumferential direction. Therefore, the symmetrical distribution of each phase winding and each branch 4 of stator winding 2 can effectively reduce the probability of circulating current problems caused by the imbalance of branch 4.

[0136] In some embodiments, the lead wire 41 of each branch 4 of the U phase differs from the lead wire 41 of the corresponding branch 4 of the V phase by 8 stator slots 11 in the circumferential direction. For example, the lead wire 41 of the first branch of the U phase differs from the lead wire 41 of the first branch of the V phase by 8 stator slots 11 in the circumferential direction. Similarly, the lead wire 41 of each branch 4 of the V phase differs from the lead wire 41 of the corresponding branch 4 of the W phase by 8 stator slots 11 in the circumferential direction. Likewise, the lead wire 41 of each branch 4 of the W phase differs from the lead wire 41 of the corresponding branch 4 of the U phase by 8 stator slots 11 in the circumferential direction.

[0137] The lead wires 41 of the first and second, third and fourth, and fifth and sixth branches of phase U differ by one stator slot 11 in the circumferential direction, and the first and third branches, and the third and fifth branches of phase U differ by 24 stator slots 11 in the circumferential direction. The lead wires 41 of the first and second, third and fourth, and fifth branches of phase V differ by one stator slot 11 in the circumferential direction, and the first and third branches, and the third and fifth branches of phase V differ by 24 stator slots 11 in the circumferential direction. The lead wires 41 of the first and second, third and fourth, and fifth branches of phase W differ by one stator slot 11 in the circumferential direction, and the first and third branches, and the third and fifth branches of phase W differ by 24 stator slots 11 in the circumferential direction. Similarly, the winding segments corresponding to 11i, 12a, 35i, 36a, 59i, and 60a can be formed as star lines 42. The star lines 42 of each branch 4 of the U-phase, V-phase, and W-phase are set in a similar manner to the above-mentioned lead-out lines 41, and will not be described in detail here. Thus, it is convenient for the lead-out lines 41 and star lines 42 of the U-phase, V-phase, and W-phase windings to be connected with corresponding wiring structures 5 (e.g., busbars).

[0138] For example, the winding path of the first branch of phase V of stator winding 2 is as follows:

[0139] 9j→20j→30i→20h→30g→20f→30e→20d→30c→20b→30a→21a→11b→21c→11d→21e→11f→21g→11h→21i→11j→22j→32i→22h→32g→22f→32e→22d→32c→22b→32a→19a→9b→19c→9d→19e→9f→19g→9h→19i.

[0140] The winding path of the second branch of phase V of stator winding 2 is as follows:

[0141] 10b→20c→10d→20e→10f→20g→10h→20i→10j→71j→9i→71h→9g→71f→9e→71d→9c→71b→9a→18a→8b→18c→8d→18e→8f→18g→8h→18i→8j→69j→7i→69h→7g→69f→7e→69d→7c→69b→7a→20a.

[0142] The winding path of the third branch of phase V of stator winding 2 is as follows:

[0143] 33j→44j→54i→44h→54g→44f→54e→44d→54c→44b→54a→45a→35b→45c→35d→45e→35f→45g→35h→45i→35j→46j→56i→46h→56g→46f→56e→46d→56c→46b→56a→43a→33b→43c→33d→43e→33f→43g→33h→43i.

[0144] The winding path of the fourth branch of phase V of stator winding 2 is as follows:

[0145] 34b→44c→34d→44e→34f→44g→34h→44i→34j→23j→33i→23h→33g→23f→33e→23d→33c→23b→33a→42a→32b→42c→32d→42e→32f→42g→32h→42i→32j→21j→31i→21h→31g→21f→31e→21d→31c→21b→31a→44a.

[0146] The winding path of the fifth branch of phase V of stator winding 2 is as follows:

[0147] 57j→68j→6i→68h→6g→68f→6e→68d→6c→68b→6a→69a→59b→69c→59d→69e→59f→69g→59h→69i→59j→70j→8i→70h→8g→70f→8e→70d→8c→70b→80a→67a→57b→67c→57d→67e→57f→67g→57h→67i.

[0148] The winding path of the sixth branch of phase V of stator winding 2 is as follows:

[0149] 58b→68c→58d→68e→58f→68g→58h→68i→58j→47j→57i→47h→57g→47f→57e→47d→57c→47b→57a→66a→56b→66c→56d→66e→56f→66g→56h→66i→56j→45j→55i→45h→55g→45f→55e→45d→55c→45b→55a→68a.

[0150] For example, the winding path of the first branch of phase W of stator winding 2 is as follows:

[0151] 17j→28j→38i→28h→38g→28f→38e→28d→38c→28b→38a→29a→19b→29c→19d→29e→19f→29g→19h→29i→19j→30j→40i→30h→40g→30f→40e→30d→40c→30b→40a→27a→17b→27c→17d→27e→17f→27g→17h→27i.

[0152] The winding path of the second branch of phase W of stator winding 2 is as follows:

[0153] 18b→28c→18d→28e→18f→28g→18h→28i→18j→7j→17i→7h→17g→7f→17e→7d→17c→7b→17a→26a→16b→26c→16d→26e→16f→26g→16h→26i→16j→5j→15i→5h→15g→5f→15e→5d→15c→5b→15a→20a.

[0154] The winding path of the third branch of phase W of stator winding 2 is as follows:

[0155] 41j→52j→54i→52h→54g→52f→54e→52d→54c→52b→54a→53a→43b→53c→43d→53e→43f→53g→43h→53i→43j→54j→64i→54h→64g→54f→64e→54d→64c→54b→64a→51a→41b→51c→41d→51e→41f→51g→41h→51i.

[0156] The winding path of the fourth branch of phase W of stator winding 2 is as follows:

[0157] 42b→52c→42d→52e→42f→52g→42h→52i→42j→31j→41i→31h→41g→31f→41e→31d→41c→31b→41a→50a→40b→50c→40d→50e→40f→50g→40h→50i→40j→29j→39i→29h→39g→29f→39e→29d→39c→29b→39a→52a.

[0158] The winding path of the fifth branch of phase W of stator winding 2 is as follows:

[0159] 65j→4j→14i→4h→14g→4f→14e→4d→14c→4b→14a→5a→67b→5c→67d→5e→67f→5g→67h→5i→67j→6j→16i→6h→16g→6f→16e→6d→16c→6b→16a→3a→65b→3c→65d→3e→65f→3g→65h→3i.

[0160] The winding path of the sixth branch of phase W of stator winding 2 is as follows:

[0161] 66b→4c→66d→4e→66f→4g→66h→4i→66j→55j→65i→55h→65g→55f→65e→55d→65c→55b→65a→2a→64b→2c→64d→2e→64f→2g→64h→2i→64j→53j→63i→53h→63g→53f→63e→53d→63c→53b→63a→4a.

[0162] In some embodiments, the leads 41 of 1j, 2b, 25j, 26b, 49j, and 50b can be extended as positive leads of the U phase, the leads 41 of 9j, 10b, 33j, 34b, 57j, and 58b can be extended as positive leads of the V phase, the leads 41 of 17j, 18b, 41j, 42b, 65j, and 66b can be extended as positive leads of the W phase, and the star lines 42 of 11i, 12a, 35i, 36a, 59i, 60a, 19i, 20a, 43i, 44a, 67i, 68a, 27i, 20a, 51i, 52a, 3i, and 4a can be connected (e.g., welded) together to form a star connection. Of course, the positions of the leads 41 and star lines 42 of the U, V, and W phases are not limited to this.

[0163] In some embodiments of this disclosure, referring to Figures 1 and 17-19, each phase and each branch 4 of the stator winding 2 has a first end 4a and a second end 4b at its two ends. The first end 4a is connected to the lead wire 41, and the second end 4b is connected to the star line 42. The first end 4a and the second end 4b of at least one branch 4 are respectively located in two adjacent slot layers 12 of a plurality of slot layers 12. Thus, the lead wire 41 and the star line 42 of the branch 4 are located in adjacent slot layers 12, which helps to simplify the manufacturing process of the stator winding 2. For example, the lead wire 41 and the star line 42 of each branch 4 are located in adjacent slot layers 12.

[0164] In some embodiments, one of the first end 4a and the second end 4b of each phase and branch 4 of the stator winding 2 may be located in the innermost slot layer 12 and the other in the slot layer 12 adjacent to the innermost slot layer 12, or one of the first end 4a and the second end 4b may be located in the outermost slot layer 12 and the other in the slot layer 12 adjacent to the outermost slot layer 12.

[0165] In some embodiments of this disclosure, referring to FIG23, the plurality of branches 4 satisfy at least one of the following conditions: Condition A1, the second end 4b of at least one of the plurality of branches 4 is located in the innermost trench layer 12, and the first end 4a of the plurality of branches 4 is located in the trench layer 12 adjacent to the innermost trench layer 12; Condition A2, the first end 4a of at least one of the plurality of branches 4 is located in the outermost trench layer 12, and the second end 4b of the plurality of branches 4 is located in the trench layer 12 adjacent to the outermost trench layer 12; Condition A3, the first end 4a of two adjacent branches 4 in the same phase is located in the outermost trench layer 12 and the trench layer 12 adjacent to the innermost trench layer 12, respectively; Condition A4, the first end 4a of two adjacent branches 4 in the same phase is located in the outermost trench layer 12 and the innermost trench layer 12, respectively. Therefore, the lead wires 41 and star wires 42 of each phase branch 4 can have multiple configuration methods, which facilitates the application of the design requirements of the stator assembly 100 and helps to improve the applicability of the stator assembly 100.

[0166] It is understandable that when multiple branches 4 meet condition A4, that is, the lead wires 41 of two adjacent branches 4 in the same phase can be led out from the outermost slot layer 12 and the innermost slot layer 12 respectively. For the entire stator winding 2, not all lead wires 41 are set on the same side, which facilitates the distributed arrangement of multiple lead wires 41 and is beneficial to the arrangement of multiple branch lines 4.

[0167] Furthermore, for a single branch 4, the lead wire 41 of the single branch 4 can be located at either end of the axial direction of the stator core 1. For example, the first winding segment 21 can be constructed in a generally U-shape and includes a first bent portion 211 and two first slot inner portions 212. The first bent portion 211 is connected between one end of the two first slot inner portions 212, and the other end of each first slot inner portion 212 has a first connecting portion 214 for welding with other first winding segments 21, second winding segments 22, or third winding segments 23. In addition, the end where the first bent portion 211 is located can be a hairpin end, and the axial end of the stator core 1 away from the first bent portion 211 is the welding end. The lead wire 41 of the branch 4 can be located at the hairpin end or at the welding end.

[0168] In some embodiments, the first connecting portion 214 includes a first segment and a second segment. The first segment extends axially and is used for welding with other first winding segments 21, second winding segments 22, or third winding segments 23. The second segment extends circumferentially in the axial direction and is bent and connected between the first segment and the first groove portion 211. The shapes of the second connecting portion 224 and the third connecting portion 234 may be consistent with the shape of the first connecting portion 214.

[0169] In some embodiments of this disclosure, referring to Figures 12-15, the lead wire 41 and star line 42 of each branch 4 are located at the same end of the stator core 1 along its axial direction. It is understood that the lead wire 41 and star line 42 of each branch 4 may be located at either end of the stator core 1 along its axial direction. For example, the first winding segment 21 may be configured to be generally U-shaped and include a first bent portion 211 and two first slot portions 212. The first bent portion 211 connects between one end of the two first slot portions 212, and the other end of each first slot portion 212 has a first connecting portion 214 for welding to other first winding segments 21, second winding segments 22, or third winding segments 23. For example, the end where the first bend 211 is located can be the hairpin end, and the axial end of the stator core 1 away from the first bend 211 can be the welding end. The lead wire 41 and star line 42 of each branch 4 can be set at the hairpin end or at the welding end.

[0170] For example, the first winding segment 21 includes a first bent portion 211 and two first slot portions 212 respectively connected to the two ends of the first bent portion 211. The first slot portions 212 of multiple first winding segments 21 arranged radially along the stator core 1 are welded together at the end away from the first bent portion 211. For example, the lead wire 41 and the star wire 42 are both located at the end of the stator winding 2 away from the first bent portion 211; or, the lead wire 41 and the star wire 42 are both located at the end of the stator winding 2 where the first bent portion 211 is located.

[0171] In the above technical solution, by setting the lead wire 41 and the star line 42 to be located at the same end of the stator winding 2, the same side of the branch 4 of each phase of the stator winding 2 can be realized. This is beneficial for connecting the lead wires 41 of each phase winding and connecting the star lines 42 of the multi-phase windings. It also makes it convenient for the wiring structure 5 corresponding to the lead wire 41 and the star line 42 to be located at the same end, so that the wiring structure 5 can make full use of the space at one end of the axial direction of the stator core 1 and reduce the space of the radial yoke of the stator core 1, that is, it can save the radial space of the stator core 1.

[0172] In some technologies, the more slot layers 12 the stator slot 11 has, the more layers (e.g., more flat wire layers) the winding segment provided in the stator slot 11 has within the slot. When the stator assembly 100 and the housing (e.g., the motor housing) are generally fitted with an interference fit, and while ensuring a suitable gap (e.g., weld gap) between adjacent welded ends, the stator core needs a large radial yoke space. Therefore, in some embodiments of this disclosure, the stator winding 2's lead wire 41 uses a combination of the outermost slot layer 12 and the innermost slot layer 12, which can effectively save the radial space of the stator core and facilitate a reduction in motor size.

[0173] For example, referring to Figures 3 and 7, each phase winding includes multiple branches 4 (one branch 4 for all U1 corresponding to the U phase, one branch 4 for all U2 corresponding to the U phase, one branch 4 for all U3 corresponding to the U phase, one branch 4 for all U4 corresponding to the U phase, one branch 4 for all U5 corresponding to the U phase, and one branch 4 for all U6 corresponding to the U phase in Figure 7). Each branch 4 includes multiple first winding segments 21 connected in series. The first slot portion 212 of one of the two adjacent first winding segments 21 is welded to the first slot portion 212 of the other first winding segment 21 at the end away from the first bend portion 211, that is, a welded end is formed between the two adjacent first winding segments 21 to realize the series connection of the two adjacent first winding segments 21.

[0174] In some embodiments, the first winding segment 21 may be configured to be generally U-shaped and include a first bent portion 211 and two first groove portions 212. The first bent portion 211 is connected between one end of the two first groove portions 212, and the other end of each first groove portion 212 has a first connecting portion 214 for welding with other first winding segments 21, second winding segments 22, or third winding segments 23. For example, the end where the first bent portion 211 is located can be the hairpin end of the first winding segment 21, and the axial end of the stator core 1 away from the first bent portion 211 is the welding end. The second winding segment 22 includes a second bent portion 221 and two second groove portions 223 respectively connected to the two ends of the second bent portion 221. The end of each second groove portion 223 away from the second bent portion 221 has a second connecting portion 224 for welding with other first winding segments 21, etc. The third winding segment 23 includes a third bend portion 231 and two third groove portions 232 respectively connected to the two ends of the third bend portion 231. Each third groove portion 233 has a third connecting portion 234 at the end away from the third bend portion 231 for welding with other first winding segments 21, etc.

[0175] For example, referring to Figures 4 and 8-9, the stator slot 11 has 10 slot layers 12. The 10 slot layers 12 include layers a, b, c, d, e, f, g, h, i, and j arranged sequentially along the radial inner side to the outer side of the stator core 1. Each phase winding includes two winding units. Each winding unit includes a second winding segment 22 arranged in series, two sets of circumferentially spaced winding groups 2a, and a third winding segment 23. Each winding group 2a includes four first winding segments 21. From radially inward to radially outward, the four first winding segments 21 are respectively the first first winding, the second first winding, the third first winding, and the fourth first winding. The first first winding segment 21 has one first slot portion 212 located in layer b, and another second slot portion 212 located in layer c. The second first winding segment 21 has one first slot portion 212 located in layer d, and another first slot portion 212 located in layer e. The third first winding segment 21 has one first slot portion 212 located in layer f, and another first slot portion 212 located in layer g. The fourth first winding segment 21 has one first slot portion 212 located in layer h, and another first slot portion 212 located in layer i. The second slot portion 222 of each second winding segment 22 is located in layer a, and the two third slot portions 232 of each third winding segment 23 are located in layer j.

[0176] Therefore, taking a third winding segment 23, a group of windings 2a, and a second winding segment 22 arranged in series as an example, the third connecting part 234 of the third winding segment 23 is welded to the first connecting part 214 of the fourth first winding segment 21, the first connecting part 214 of the fourth first winding segment 21 is welded to the first connecting part 214 of the third first winding segment 21, the first connecting part 214 of the third first winding segment 21 is welded to the first connecting part 214 of the second first winding segment 21, the first connecting part 214 of the second first winding segment 21 is welded to the first connecting part 214 of the first first winding segment 21, and the first connecting part 214 of the first first winding segment 21 is welded to the second connecting part 224 of the second winding segment 22.

[0177] In some embodiments, the winding assembly 2a includes a plurality of first winding segments 21 connected in series radially from one side to the other along the stator core 1. The spans of the plurality of first winding segments 21 are the same, but their structures are different. For example, referring to Figures 8 and 12, the first first winding segment 21 spans between layers b and c, and its span is 10. Referring to Figures 8 and 13, the second first winding segment 21 spans between layers d and e, and its span is 10. Referring to Figures 8 and 14, the third first winding segment 21 spans between layers f and g, and its span is 10. Referring to Figures 8 and 15, the fourth first winding segment 21 spans between layers h and i, and its span is 10.

[0178] For example, referring to Figures 1 and 7-9, each stator slot 11 has 10 slot layers 12. In six adjacent stator slots 11, such as slot 10, slot 11, slot 12, slot 13, slot 14 and slot 15, the above six stator slots 11 are constructed as a per-pole per-phase slot region 10. The same slot layer 12 in the six adjacent stator slots 11 forms 10 slot layer groups 13. The 10 slot layer groups 13 include a first slot layer group 13a, a second slot layer group 13b and eight intermediate slot layer groups 13c. The eight intermediate slot layer groups 13c include four first intermediate slot layer groups and four second intermediate slot layer groups arranged alternately along the radial direction of the stator core 1. Within the same magnetic pole, the winding segments (e.g., the portion within the slot) of each phase winding in the first and second intermediate slot layers are offset by two stator slots circumferentially. That is, in the six adjacent stator slots 11, the two middle stator slots 11 have 10 winding segments of the same phase winding, and the two stator slots 11 on both sides of the two middle stator slots 11 each have 5 winding segments of the same phase winding. The winding segments of the same phase winding in the left stator slot 11 (e.g., with the circumferential direction as left and right) occupy the even-numbered slot layers 12, and the winding segments of the same phase winding in the right stator slot 11 occupy the odd-numbered slot layers 12.

[0179] Similarly, the windings of each pole and each phase of stator winding 2 are distributed in this way. Thus, it can be seen that the windings of stator winding 2 adopt a short-pitch overlapping method, which can reduce the number of twisted slots of the winding segment at the welding end of stator winding 2 from 6 stator slots 11 on a single side with full pitch to 5 stator slots 11 on a single side with short pitch. For example, the height of the welding end can be reduced by 8-10mm. The first winding segment 21 of the middle slot layer group 13c of the stator winding 2 at the hairpin end is reduced from a full-pitch 12-span to a short-pitch 10-span. Furthermore, the winding segments (second winding segment 22 and third winding segment 23) at the hairpin end of the stator winding 2 use the same span in both the slot opening layer (e.g., layer a) and the slot bottom layer (layer j). Combined with the design of long and short-pitch winding segments (e.g., first winding segment 21, second winding segment 22, and third winding segment 23), the height of the winding segments can be effectively reduced, thus reducing the end height of the stator winding 2. This reduces the resistance and copper loss of the stator winding, improves efficiency, and effectively avoids significant modifications to the winding segments (e.g., the hairpin) when the number of branches per phase needs to be adjusted later. Secondly, the short-pitch stator winding design provides better NVH (noise, vibration, and harshness) performance. Furthermore, compared to some technologies where the stator winding has welding points at both ends of the axial direction, in some embodiments of this disclosure, the first connecting portion 214 of all the first winding segments 21 is located at the same end of the axial direction of the stator core 1, and two first connecting portions 214 are welded together to form a welding point. Thus, all welding points of the stator winding 2 are located at the same end of the axial direction of the stator core 1, which can reduce the welding difficulty and simplify the welding process.

[0180] For example, referring to Figures 3, 7, and 17-22, the stator winding 2 has a 3-phase winding, with each phase winding having 6 branches 4. The two ends of each phase branch 4 are a first end 4a and a second end 4b, respectively. 18 first ends 4a extend as leads 41, that is, the first segment is the positive lead, and 18 second ends 4b extend as star lines 42. The 6 leads 41 of the same phase are connected together, and the 18 star lines 42 are connected together to form a star connection.

[0181] Secondly, referring to FIG26, some embodiments of the present disclosure provide a motor 200, including a stator assembly 100 according to the first aspect of the present disclosure described above. For example, the motor 200 may be a flat wire motor.

[0182] In the above technical solution, the performance of the motor 200 can be improved by adopting the stator assembly 100.

[0183] Thirdly, referring to FIG27, some embodiments of the present disclosure provide an electric power assembly 500, including a motor 200 according to the second aspect embodiment of the present disclosure described above.

[0184] In the above technical solution, by adopting the motor 200, the performance of the electric power assembly 500 can be improved.

[0185] Fourthly, referring to Figures 28 and 29, some embodiments of this disclosure provide a vehicle 1000, including a motor 200 according to the second aspect embodiment of this disclosure above or an electric assembly 500 according to the third aspect embodiment of this disclosure above.

[0186] In the above technical solution, by adopting the motor 200 or electric assembly 500, the NVH performance of vehicle 1000 can be improved.

[0187] In the description of this disclosure, it should be understood that the terms "center," "length," "thickness," "upper," "lower," "left," "right," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0188] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0189] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0190] Although embodiments of this disclosure have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A stator assembly suitable for use in a z-slot 2p-pole m-phase motor, wherein, y = z / (2p), the number of slots per pole per phase is q = z / m / (2p), wherein the stator assembly includes: A stator core having a plurality of stator slots spaced circumferentially along its circumference, each stator slot having a plurality of slot layers arranged radially along its radial direction, the same slot layers of the plurality of stator slots forming a slot layer group, the slot layer group including a first slot layer group, a second slot layer group, and a plurality of intermediate slot layer groups, the plurality of intermediate slot layer groups being located between the first slot layer group and the second slot layer group; and The stator winding includes at least one first winding segment, any one of the at least one first winding segment spans y1 stator slots among the plurality of stator slots, and any one first winding segment includes two inner portions of the first slots, the two inner portions of the first slots being respectively located in adjacent intermediate slot layers among the plurality of intermediate slot layers, wherein y1 satisfies: y-x1-(q-1)≤y1≤y-x1+(q-1), where x1 is a positive integer and x1<q.

2. The stator assembly according to claim 1, wherein, The condition y1 satisfies: y1 + x1 = y.

3. The stator assembly according to claim 1 or 2, wherein, The at least one first winding segment includes multiple first winding segments, and the multiple first winding segments have equal spans.

4. The stator assembly according to any one of claims 1-3, wherein, The plurality of trench layers includes at least 10 trench layers.

5. The stator assembly according to any one of claims 1-4, wherein, Each phase of the stator winding includes multiple branches, and each branch includes multiple first winding segments arranged radially along the stator core. The corresponding first slot portions of two adjacent first winding segments are located in the same stator slot. Each of the two first slot portions has two first connecting portions at one end, extending circumferentially towards each other. The corresponding first connecting portions of two adjacent first winding segments are connected to each other, so that the adjacent first winding segments are connected in series.

6. The stator assembly according to any one of claims 1-5, wherein, The plurality of intermediate slot layer groups include at least one first intermediate slot layer group and at least one second intermediate slot layer group arranged radially along the stator core. Within the same magnetic pole, the in-phase windings of the stator windings in the at least one first intermediate slot layer group and the at least one second intermediate slot layer group are circumferentially offset by the x1 stator slots.

7. The stator assembly according to claim 6, wherein, The at least one first intermediate slot layer group includes multiple first intermediate slot layer groups, and the multiple second intermediate slot layer groups include multiple second intermediate slot layer groups. The multiple first intermediate slot layer groups are arranged adjacently to form a first intermediate slot layer unit, and the multiple second intermediate slot layer groups are arranged adjacently to form a second intermediate slot layer unit. The first intermediate slot layer units and the second intermediate slot layer units are arranged alternately along the radial direction of the stator core; or, The plurality of first intermediate slot layer groups and the plurality of second intermediate slot layer groups are arranged alternately along the radial direction of the stator core.

8. The stator assembly according to any one of claims 1-7, wherein, The stator winding further includes at least one second winding segment, any one of the at least one second winding segment spans y2 stator slots, and any one second winding segment includes two inner portions of the second slots, both of which are located in the first slot layer group, and y2 satisfies: y-(q-1)≤y2≤y+(q-1).

9. The stator assembly according to claim 8, wherein, q≥4, each phase of the stator winding includes multiple second winding segments, at least one of the multiple second winding segments has a span y2=y-(q-1), and at least one of the remaining second winding segments has a span y2=y+(q-3).

10. The stator assembly according to any one of claims 1-9, wherein, The stator winding further includes at least one third winding segment, any one of the at least one third winding segment spans y3 stator slots, and any one third winding segment includes two inner portions of the third slots, both of which are located in the second slot layer group, and y3 satisfies: y-(q-1)≤y3≤y+(q-1).

11. The stator assembly of claim 10, wherein, q≥4, each phase of the stator winding includes multiple third winding segments, and the span of each of the multiple third winding segments satisfies y3=y-(q-3).

12. The stator assembly according to any one of claims 1-11, wherein, z = 72, 2p = 6, m = 3, q ​​= 4, and each phase of the stator winding includes 6 branches; The winding path of the first branch of the first phase of the stator winding is as follows: 1j→12j→22i→12h→22g→12f→22e→12d→22c→12b→22a→13a→3b→13c→3d→13e→3f→13g→3 h→13i→3j→14j→24i→14h→24g→14f→24e→14d→24c→14b→24a→11a→1b→11c→1d→11e→1f→11g→1h→11i; The winding path of the second branch of the first phase of the stator winding is as follows: 2b→12c→2d→12e→2f→12g→2h→12i→2j→63j→1i→63h→1g→63f→1e→63d→1c→63b→1a→10a →72b→10c→72d→10e→72f→10g→72h→10i→72j→61j→71i→61h→71g→61f→71e→61d→71c→61b→71a→12a; The winding path of the third branch of the first phase of the stator winding is as follows: 25j→36j→46i→36h→46g→36f→46e→36d→46c→36b→46a→37a→27b→37c→27d→37e→27f→37 g→27h→37i→27j→38j→48i→38h→48g→38f→48e→38d→48c→38b→48a→35a→25b→35c→25d→35e→25f→35g→25h→35i; The winding path of the fourth branch of the first phase of the stator winding is as follows: 26b→36c→26d→36e→26f→36g→26h→36i→26j→15j→25i→15h→25g→15f→25e→15d→25c→15 b→25a→34a→24b→34c→24d→34e→24f→34g→24h→34i→24j→13j→23i→13h→23g→13f→23e→13d→23c→13b→23a→36a; The winding path of the fifth branch of the first phase of the stator winding is as follows: 49j→60j→70i→60h→70g→60f→70e→60d→70c→60b→70a→61a→51b→61c→51d→61e→51f→61 g→51h→61i→51j→62j→72i→62h→72g→62f→72e→62d→72c→62b→72a→59a→49b→59c→49d→59e→49f→59g→49h→59i; The winding path of the sixth branch of the first phase of the stator winding is as follows: 50b→60c→50d→60e→50f→60g→50h→60i→50j→39j→49i→39h→49g→39f→49e→39d→49c→39 b→49a→58a→48b→58c→48d→58e→48f→58g→48h→58i→48j→37j→47i→37h→47g→37f→47e→37d→47c→37b→47a→60a.

13. The stator assembly according to any one of claims 1-12, wherein, Each phase of the stator winding includes multiple branches. The two ends of each branch are a first end and a second end, respectively. The first end is connected to a lead wire, and the second end is connected to a star point wire. The first end and the second end of at least one branch are respectively located in two adjacent slots of the multiple slot layers.

14. The stator assembly according to claim 13, wherein, The multiple branches satisfy at least one of the following conditions: Condition A1: The second end of at least one of the multiple branches is located in the innermost groove layer, and the first end of the multiple branches is located in a groove layer adjacent to the innermost groove layer. Condition A2: The first end of at least one of the multiple branches is located in the outermost groove layer, and the second end of the multiple branches is located in a groove layer adjacent to the outermost groove layer. Condition A3: The first ends of two adjacent branches of the same phase are respectively located in the outermost tank layer and the tank layer adjacent to the innermost tank layer; Condition A4: The first ends of two adjacent branches of the same phase are respectively located in the outermost and innermost trench layers.

15. The stator assembly of claim 14, wherein, The lead-out line and the star-point line of each branch are located at the same end of the axial direction of the stator core.

16. An electric motor comprising a stator assembly according to any one of claims 1-15.

17. An electric powertrain comprising the motor according to claim 16.

18. A vehicle comprising the electric motor of claim 16 or the electric powertrain of claim 17.

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