Stator assembly, motor, electric assembly and vehicle

Abstract

The invention discloses a stator assembly, a motor, an electric assembly and a vehicle, the stator assembly is suitable for the motor with z slots, 2p poles and m phases, y = z / (2p), the slot number per pole per phase is q = z / m / (2p), the stator assembly comprises a stator iron core and a stator winding, the stator iron core is provided with a plurality of stator slots which are arranged at intervals along the circumferential direction of the stator iron core, and the stator winding is wound around the stator slots. Each stator slot is internally provided with a plurality of slot layers which are sequentially arranged along the radial direction of the stator core, the same slot layers of the plurality of stator slots form a slot layer group, the slot layer group comprises a first slot layer group, a second slot layer group and a plurality of middle slot layer groups, and the plurality of middle slot layer groups are positioned between the first slot layer group and the second slot layer group; the stator winding comprises a first winding section, the first winding section spans y1 stator slots, the first winding section comprises two first in-slot parts, the two first in-slot parts of the first winding section are located in the adjacent middle slot layer groups respectively, and y1 meets the condition that y1 is larger than or equal to y-x1-(q-1) and smaller than or equal to y-x1 + (q-1). According to the stator assembly provided by the embodiment of the invention, motor vibration or noise can be effectively suppressed, and the NVH effect of a vehicle can be improved.

Description

Technical Field

[0001] This invention relates to the field of electric motor technology, and in particular to a stator assembly, an electric motor, an electric powertrain, and a vehicle. Background Technology

[0002] 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, directly affecting 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.

[0003] 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. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a stator assembly, a motor, and a vehicle, wherein 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, embodiments of this application provide a stator assembly suitable for a z-slot 2p-stage m-phase motor, wherein y = z / (2p), and the number of slots per pole per phase is q = z / m / (2p). The stator assembly includes: a stator core having a plurality of stator slots spaced circumferentially along the stator core; each stator slot having a plurality of slot layers arranged radially along the stator core; the same slot layer of the plurality of stator slots forming a slot layer group; the slot layer group including a first slot layer group; The second slot layer group and multiple intermediate slot layer groups are located between the first slot layer group and the second slot layer group; the stator winding includes a first winding segment that spans y1 stator slots, the first winding segment includes two inner portions of the first slot, the two inner portions of the first winding segment are respectively located in two adjacent intermediate slot layer groups, y1 satisfies: y-x1-(q-1)≤y1≤y-x1+(q-1), 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. At the same time, it is 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 application, y1 satisfies: y1+x1=y.

[0008] In some embodiments of this application, the stator winding includes multiple first winding segments with equal spans.

[0009] In some embodiments of this application, the stator slot has at least 10 slot layers.

[0010] In some embodiments of this application, each phase of the stator winding includes multiple branches, each branch includes multiple first winding segments arranged radially in sequence, the corresponding first slot portions of two adjacent first winding segments are located in the same stator slot, one end of each first slot portion has a first connecting portion, the two first connecting portions of each first winding segment extend in the circumferential direction toward each other, and the corresponding first connecting portions of two adjacent first winding segments are connected to each other so that the two adjacent first winding segments are connected in series.

[0011] In some embodiments of this application, the plurality of intermediate slot layer groups include a first intermediate slot layer group and a second intermediate slot layer group arranged radially. Within the same magnetic pole, the in-phase windings of the stator windings in the first intermediate slot layer group and the second intermediate slot layer group are circumferentially offset by x1 stator slots.

[0012] In some embodiments of this application, there are multiple first intermediate trench layer groups and multiple second intermediate trench layer groups. The multiple first intermediate trench layer groups are arranged adjacently to form a first intermediate trench layer unit, and the multiple second intermediate trench layer groups are arranged adjacently to form a second intermediate trench layer unit. The first intermediate trench layer unit and the second intermediate trench layer unit are arranged alternately in the radial direction; or, the first intermediate trench layer group and the second intermediate trench layer group are arranged alternately in the radial direction.

[0013] In some embodiments of this application, the stator winding further includes a second winding segment that spans y2 stator slots. The second winding segment includes 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 is less than the radial distance between the remaining slot layer groups and the central axis of the stator core. y2 satisfies: y-(q-1)≤y2≤y+(q-1).

[0014] In some embodiments of this application, q≥4, each phase of the stator winding includes multiple second winding segments, at least one second winding segment 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 application, the stator winding further includes a third winding segment that spans y3 stator slots. The third winding segment includes two inner portions of the third slot, 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 remaining slot layer groups and the central axis of the stator core. y3 satisfies: y-(q-1)≤y3≤y+(q-1).

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

[0017] In some embodiments of this application, z = 72, 2p = 6, m = 3, q ​​= 4, and each phase of the stator winding includes 6 branches. The first branch of the first phase of the stator winding has the following winding path: 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 second branch of the first phase of the stator winding... The winding path 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→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 application, each phase of the stator winding includes multiple branches, with each branch having a first end and a second end at its two ends. 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 slot layers.

[0019] In some embodiments of this application, multiple branches satisfy at least one of the following conditions: Condition A1: The second end of at least one branch is located in the innermost slot layer, and the first end is located in a slot layer adjacent to the innermost slot layer; Condition A2: The first end of at least one branch is located in the outermost slot layer, and the second end 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 the 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 the innermost slot layer.

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

[0021] Secondly, embodiments of this application provide an electric motor, including a stator assembly according to the first aspect of the present invention 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, embodiments of this application provide an electric powertrain including a motor according to the second aspect of the present invention described above.

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

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

[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 the invention 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 the invention. Attached Figure Description

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

[0029] Figure 1 These are schematic diagrams of stator assemblies provided in some embodiments of this application;

[0030] Figure 2 yes Figure 1 An enlarged view of part A mentioned above;

[0031] Figure 3 This is a schematic diagram of a stator winding provided in some embodiments of this application;

[0032] Figure 4 yes Figure 3 An enlarged view of part B;

[0033] Figure 5 This is a schematic diagram of a stator core provided in some embodiments of this application;

[0034] Figure 6 yes Figure 3 An enlarged view of section C;

[0035] Figure 7 This is a schematic diagram of the distribution of the stator winding U-phase branch and the direction of the current in the slot provided in some embodiments of this application, 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 This is a schematic diagram of a winding group of the first branch of the U-phase provided in some embodiments of this application;

[0037] Figure 9 This is a schematic diagram of another winding group of the first branch of the U phase provided in some embodiments of this application;

[0038] Figure 10 This is a schematic diagram of the second winding segment provided in some embodiments of this application;

[0039] Figure 11 This is another schematic diagram of the second winding segment provided in some embodiments of this application;

[0040] Figure 12 This is a schematic diagram of the first winding segment provided in some embodiments of this application (spanning from layer b to layer c);

[0041] Figure 13 This is a schematic diagram of the first winding segment provided in some embodiments of this application (spanning from the d-th layer to the e-th layer);

[0042] Figure 14 This is a schematic diagram of the first winding segment provided in some embodiments of this application (spanning from the f-th layer to the g-th layer);

[0043] Figure 15 This is a schematic diagram of the first winding segment provided in some embodiments of this application (spanning from the h-th layer to the i-th layer);

[0044] Figure 16 This is a schematic diagram of the third winding segment provided in some embodiments of this application;

[0045] Figure 17 This is another schematic diagram of a stator assembly provided in some embodiments of this application;

[0046] Figure 18 This is yet another schematic diagram of a stator assembly provided in some embodiments of this application;

[0047] Figure 19 This is another schematic diagram of a stator assembly provided in some embodiments of this application;

[0048] Figure 20 This is a U-phase wiring diagram provided in some embodiments of this application;

[0049] Figure 21 This is a V-phase wiring diagram provided in some embodiments of this application;

[0050] Figure 22 This is a W-phase wiring diagram provided in some embodiments of this application;

[0051] Figure 23 This is a three-phase wiring diagram of the stator winding provided in some embodiments of this application;

[0052] Figures 24(a)-24(f) This is a wiring diagram of the six branches of the U-phase stator winding provided in some embodiments of this application;

[0053] Figure 25 These are waveform diagrams of the U-phase branch current provided in some embodiments of this application.

[0054] Figure label:

[0055] Stator assembly 100, slot area per stage 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 bending portion 211, first slot inner portion 212, first connecting portion 214, second bending portion 221, second slot inner portion 222, second connecting portion 224, third bending portion 231, third slot inner portion 232, third connecting portion 234, branch 4, first end 4a, second end 4b, lead wire 41, star wire 42, wiring structure 5. Detailed Implementation

[0056] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown 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 the present invention, and should not be construed as limiting the present invention.

[0057] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Additionally, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0058] Hereinafter, with reference to the accompanying drawings, a stator assembly 100 according to an embodiment of the present invention will be described, which is suitable for a motor with z slots, 2p stages, and m phases, wherein y = z / (2p) and the number of slots per pole per phase is q = z / m / (2p).

[0059] 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.

[0060] like Figures 1-6As shown, the stator assembly 100 includes a stator core 1, which has multiple stator slots 11 spaced circumferentially along the stator core 1. Each stator slot 11 has multiple slot layers 12 arranged radially along the stator core 1. The same slot layer 12 of the multiple 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 multiple intermediate slot layer groups 13c. The multiple intermediate slot layer groups 13c are located in the first... Between a slot layer group 13a and a second slot layer group 13b; it can be seen that 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 12c.

[0061] For example, 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 multiple slot layers 12 of each stator slot 11 may include an innermost slot layer, an outermost slot layer and multiple 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 among the multiple slot layers 12 in the radial direction of the stator core 1. The outermost slot layer can be understood as the slot layer 12 farthest from the central axis of the stator core 1 among the multiple slot layers 12 in the radial direction of the stator core 1. The innermost slot layers of the multiple stator slots 11 of the stator core 1 can form the innermost slot layer group, and the outermost slot layers of the multiple stator slots 11 of the stator core 1 can form the outermost slot layer group.

[0062] In the following description of this application, 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 for illustration; of course, the following embodiments of this application are also applicable to the second groove layer group 13b being the innermost groove layer group and the first groove layer group 13a being the outermost groove layer group.

[0063] It should be noted that in the description of this application, "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 passing 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.

[0064] The stator assembly 100 also includes a stator winding 2, which is disposed on the stator core 1. The stator winding 2 includes a first winding segment 21, which spans y1 stator slots 11. The first winding segment 21 includes two first slot inner portions 212. The two first slot inner portions 212 of the first winding segment 21 are respectively located in adjacent intermediate slot layer groups 13c. The slot layers 12 where the two first slot inner portions 212 are located are both located in intermediate slot layers. The two intermediate slot layers are connected. In other words, the two first slot inner portions 212 are respectively located in two adjacent intermediate slot layers of different stator slots 11. That is, if the multiple slot layers 12 are arranged radially from the inside to the outside or from the outside to the inside, then the multiple intermediate slot layers 12 are all slot layers 12 (including the second slot layer and the second to last slot layer) from the second slot layer 12 to the second to last slot layer 12. The values ​​of the slot layers 12 where the two first slot inner portions 212 are located differ by 1. Where y1 satisfies: y-x1-(q-1)≤y1≤y-x1+(q-1), x1 is a positive integer and x1<q.

[0065] 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, the portion 212 within one of the first slots of the first winding segment 21 is located at the y-th slot. 11 The groove, another first groove inner portion 212 is located at the yth 12 The slot, then the first winding segment 21 spans (y 12 -y 11 ) stator slots 11, i.e. y1 = y 12 -y 11 .

[0066] Since y-x1-(q-1)≤y1≤y-x1+(q-1) and x1<q, the stator winding 2 can be wound in a “short-pitch + cross-layer” manner in at least a portion of the intermediate slot layer group 13c. This can effectively suppress the harmonic electromagnetic excitation generated by the circulating current, such as eliminating the 5th or 7th harmonic in the magnetic field. This can effectively suppress the occurrence of motor vibration or noise, such as having a good suppression effect on the 24th order torque pulsation of the motor, which is beneficial to improving the NVH (noise, vibration and harshness) effect of the vehicle. The first winding segment 21 can have a variety of span options. The stator winding 2 can be wound with a first winding segment 21 of one span or with a first winding segment 21 of multiple spans, so that the stator winding 2 has a variety of flexible structures, which is beneficial to improving the adaptability of the stator assembly 100, so as to adapt to different needs of the motor.

[0067] Optionally, 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 can be configured as a hairpin, which 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.

[0068] Optionally, in some examples, the windings within the first slot group 13a and the second slot group 13b use the windings of the same slot 12 (e.g., same-layer crossing), 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), and the multiple first winding segments 21 corresponding to the intermediate slot group 13c are wound in a lap winding manner. This simplifies the arrangement of the stator winding 2 and effectively reduces the height of the stator winding at the axial end of the stator core. Simultaneously, when each phase winding of the stator winding 2 includes multiple branches, subsequent adjustments to the number of branches in each phase winding can avoid significant modifications to the winding segments (e.g., the first winding segment 21, the second winding segment 22, and the third winding segment 23 mentioned below), thus reducing the adjustment difficulty of the stator winding 2. Optionally, combined with... Figure 5 and Figure 6 The stator core 1 includes an annular stator yoke and multiple stator teeth. The multiple stator teeth are arranged at intervals along the circumference of the stator yoke. The stator teeth are connected to the inner or outer circumferential surface of the stator yoke, and a stator slot 11 is formed between two adjacent stator teeth. The stator core 1 has a plurality of stator slots 11 spaced apart along the circumference of the stator core 1. The plurality of stator slots 11 are sequentially referred to as slot 1, slot 2, ..., slot (n-1), and slot n. Each stator slot 11 has a plurality of slot layers 12 sequentially arranged along the radial direction of the stator core 1. The plurality of slot layers 12 are respectively 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. Then 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. Layer a is the slot opening layer and layer r is the slot bottom layer, or layer a is the slot bottom layer and layer r is the slot opening layer.

[0069] 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 layers 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 13c 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 harmonic 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. At the same time, it is 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.

[0070] In some embodiments of this application, the stator slot 11 has at least 10 slot layers 12. For example, the intermediate slot layer group 13c has at least 8 slot layers 12, and the intermediate slot layer group 13c can be arranged with at least four first winding segments 21. 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 improving the arrangement density of the stator winding 2, increasing the power of the motor, and facilitating the realization of ultra-high power.

[0071] Optionally, each phase of the stator winding 2 can have 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 increasing the power of the motor. Secondly, 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 power of the motor can be further increased, making it easier to achieve ultra-high power settings for the motor.

[0072] In some embodiments of this application, combined with Figure 1 , Figures 12-15Each phase of the stator winding 2 includes multiple branches 4, and each branch 4 includes multiple first winding segments 21 arranged radially in sequence. 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 located in the same stator slot 11, and the other first slot portion 212 is also located in the same stator slot 11. One end of each first slot portion 212 has a first connecting portion 214. The two first connecting portions 214 of each first winding segment 21 extend in the circumferential direction toward each other. The corresponding first connecting portions 214 of two adjacent first winding segments 21 are connected so that the two adjacent first winding segments 21 are connected in series. Therefore, the multiple first winding segments 21 arranged radially in sequence 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.

[0073] In some embodiments of this application, y1 satisfies: y1 + x1 = y. Therefore, the span of the first winding segment 21 is y1 = y - x1, meaning the span of the first winding segment 21 is less than y. This means that 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, which is reduced from y to (y - x1). This can, to a certain extent, reduce the height of the stator winding 2 at the 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). This can reduce the amount of material used in the stator winding 2 (e.g., the amount of copper) and the resistance of the stator winding 2, which is beneficial for improving the performance and efficiency of the motor.

[0074] In some embodiments of this application, combined with Figure 8 and Figure 9 The stator winding 2 includes multiple first winding segments 21, with equal spans between them. This facilitates consistent wiring of the stator winding 2 in the intermediate slot layer 13c, reducing the difficulty of arranging the stator winding 2. Furthermore, the equal spans of the multiple first winding segments 21 in the intermediate slot layer 13c ensure that the ends of the multiple first winding segments 21 on one axial side of the stator core 1 are at the same height. This allows the ends of the stator winding 2 on one axial side of the stator core 1 to be at consistent heights, which helps reduce the axial length of the stator assembly 100 and thus the axial dimensions of the motor.

[0075] Optionally, the span y1 of the multiple first winding segments 21 of the stator winding 2 all satisfy: y1+x1=y.

[0076] 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 radially in series. The spans of the multiple first winding segments 21 of the winding group 2a are equal. 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.

[0077] In some embodiments of this application, 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 also 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.

[0078] 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.

[0079] For example, combined Figure 8 and Figure 9 Multiple first winding segments 21 connected in series radially constitute a winding group 2. Each phase of the stator winding 2 includes multiple winding groups 2a, which can be arranged circumferentially at intervals. The spans of the first winding segments 21 in different winding groups 2 may be equal or unequal. Therefore, when the spans of the first winding segments 21 in different winding groups 2a are equal, it is beneficial to simplify the winding difficulty of the stator winding 2 and facilitates the realization that the spans of all first winding segments 21 in the intermediate slot layer 12 are equal, which is beneficial to reducing the number of processing equipment and realizing mass production. When the spans of the first winding segments 21 in different winding groups 2a are unequal, winding groups 2 with different spans belonging to the same phase and the same branch 4 can be connected in series, which is beneficial to adapting to the winding requirements of the stator winding 2 and facilitating the arrangement of the stator winding 2.

[0080] For example, combining Figure 3 , Figure 5 and Figures 7-9In each phase winding, there are multiple first winding segments 21 with their ends located in slots 12 and 22 respectively. These multiple first winding segments 21 can be connected in series to form a first winding group. There are also multiple first winding segments 21 with their ends located in slots 14 and 24 respectively (i.e., the two inner parts 212 of each first winding segment 21 are located in slots 14 and 24 respectively). These multiple first winding segments 21 can be connected in series to form a second winding group. At this time, the span of the first winding segment 21 of the first winding group is equal to the span of the first winding segment 21 of the second winding group. The first winding group and the second winding group can be connected in series in the same branch 4 of the same phase.

[0081] In other examples, in each phase winding, multiple first winding segments 21 with their ends located in slots 12 and 24 respectively can be connected in series to form a third winding group. Multiple first winding segments 21 with their ends located in slots 14 and 22 respectively (i.e., the two inner portions 212 of each first winding segment 21 are located in slots 14 and 22 respectively) can be connected in series to form a fourth winding group 2. In this case, the span of the first winding segment 21 of the third winding group is not equal to the span of the first winding segment 21 of the fourth winding group. The third winding group and the fourth winding group can be connected in series in the same branch 4 of the same phase.

[0082] In some embodiments of this application, such as Figure 7 As shown, the plurality of intermediate slot layer groups 13c includes a first intermediate slot layer group 131 and a second intermediate slot layer group 132 arranged radially. That is, each intermediate slot layer group 13c in a portion of the plurality of intermediate slot layer groups 13c is the first intermediate slot layer group 131, and each intermediate slot layer group 13c in a portion of the plurality of intermediate slot layer groups 13c is the second intermediate slot layer group 132. Within the same magnetic pole, the in-phase windings of the stator winding 2 located in the first intermediate slot layer group 131 and the second intermediate slot layer group 132 are circumferentially misaligned by x1 stator slots.

[0083] Let x adjacent stator slots 11 corresponding to each stage and phase winding be the stage and phase slot region 10. There can be multiple stage and phase slot regions 10 spaced apart in the circumferential direction of the stator core 1. Each phase winding corresponds to at least two stage and phase slot regions 10 on the stator core 1. The two stage and phase slot regions 10 are spaced apart by (y-x1) stator slots 11. The two first slot inner portions 212 of the first winding segment 21 are respectively located in two adjacent stage and phase slot regions 10. One of the first slot inner 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 stage and phase slot region 10. The other first slot inner portion 212 is located in one of the stator slots 11 in the second intermediate slot layer group 132 of another stage and phase slot region 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.

[0084] For example, combining Figures 6-9 and Figures 12-15 Taking a stator core 1 with 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 in the direction from the inner side to the outer side of the radial direction. 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 circumferentially equidistant slot regions 10 per stage per phase, and each 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 stage 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 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 two stator slots 11 (i.e., x1 = 2), so that in each phase winding, the first intermediate slot layer group 131... 31 and the second intermediate slot layer group 132 each have 4 stator slots 11. Among the 6 adjacent stator slots 11 corresponding to each pole and each phase winding, the middle 2 stator slots 11 are filled with 10 layers by the winding segments of the first intermediate slot layer group 131 and the winding segments of the second intermediate slot layer group 132. The two stator slots 11 on one side of the circumference of the two middle stator slots 11 are provided with a portion of the winding segment of the first intermediate slot layer group 131 corresponding to the in-phase winding. The two stator slots 11 on the other side of the circumference of the two middle stator slots 11 are provided with a portion of the winding segment of the second intermediate slot layer group 132 corresponding to the in-phase winding.

[0085] Taking the stator winding 2 with corresponding poles and phases located in slots 10 to 15 and corresponding poles and phases located in slots 22 to 27 as an example, the first intermediate slot layer group 131 is formed by slot a, slot a, slot a, slot a and slot a of slot 10, slot a, slot a and slot a of slot 12, slot a and slot a of slot 13, slot a, slot a, slot a and slot a of slot 22, slot a, slot a, slot a and slot a of slot 25, slot c, slot c, slot c, slot c and slot c of slot 10, slot c, slot c, slot c and slot c of slot 13, slot c, slot c, slot c of slot 22, slot c, slot c, slot c of slot 24 and slot c of slot 25, slot b, slot b, slot b of slot 12, slot b, slot b of slot 13, slot b of slot 14 and slot b of slot 15, and slot b of slot b of slot 24, slot b of slot 25, slot b of slot 26 and slot b of slot 27. Each phase winding includes multiple first winding segments 21. The two ends of the multiple first winding segments 21 are respectively located in one of the slot layers 12 of the first intermediate slot layer group 131 and the second intermediate slot layer group 132 that 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 adjacent in the radial direction. For example, one end of a first winding segment 21 is located in the b layer of the 12th slot and the other end is located in the c layer of the 22nd slot. One end of a first winding segment 21 is located in the b layer of the 14th slot and the other end is located in the c layer of the 24th slot. Therefore, the two ends of each first winding segment 21 of each phase winding are located in one slot layer 12 of the corresponding first intermediate slot layer group 131 and one slot layer 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 in the corresponding slot region 10 of each stage, 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. Each phase winding adopts a short-pitch cross-layer winding method, that is, the stator winding 2 adopts a short-pitch cross-layer winding method, which can effectively suppress the harmonic electromagnetic excitation generated by the circulating current. For example, it can eliminate 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. It can be understood that when each phase winding includes multiple branches 4, each branch 4 includes multiple first winding segments 21 connected in series.

[0086] 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 segment of the first intermediate slot layer group 131 and the winding segment 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 within each adjacent x stator slots 11 corresponding to each pole and each phase winding, at least one stator slot 11 (e.g., (x-x1) stator slots 11) is filled by the winding segments of the first intermediate slot layer group 131 and 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 radially opposite to the second intermediate slot layer group 132 and at least one stator slot 11 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 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.

[0087] Alternatively, x = q + x1 can help to further improve the consistency and convenience of wiring.

[0088] In some embodiments of this application, combined with Figure 7 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. Therefore, the number of stator slots 11 with circumferential misalignment between the winding segments of each first intermediate slot layer group 131 and each second intermediate slot layer group 132 is the same. This 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.

[0089] It is understood that each group of first intermediate groove layer 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 layer 131 are aligned. The groove layers 12 on both sides of the multiple groups of first intermediate groove layer 131 are respectively located in the same stator groove. Each group of second intermediate groove layer 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 layer 132 are aligned. The groove layers 12 on both sides of the multiple groups of second intermediate groove layer 131 are respectively located in the same stator groove.

[0090] For example, combining Figure 7 Each pole of the U-phase winding is located in six adjacent stator slots 11. The six adjacent stator slots 11 have ten slot layer groups 13. The ten slot layer groups 13 include 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 to say, the U-phase winding occupies four slot layers 12 of the first intermediate slot layer group 131 and four slot layers 12 of the second intermediate slot layer group 132.

[0091] In some embodiments of this application, there are multiple first intermediate slot layer groups 131 and second intermediate slot layer groups 132. Multiple first intermediate slot layer groups 131 are arranged adjacently to form a first intermediate slot layer unit, and 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 second intermediate slot layer units are arranged alternately in the radial direction; or, the first intermediate slot layer groups 131 and second intermediate slot layer groups 132 are arranged alternately in the radial direction. Therefore, the stator winding 2 has multiple arrangement methods, allowing it to have various structures to adapt to the needs of the motor.

[0092] In some examples, 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 unit and the second intermediate slot layer unit are arranged alternately in the radial direction. In this case, in the radial direction of the stator core 1, there is no second intermediate slot layer group 132 between two adjacent first intermediate slot layer groups 131, and there is no first intermediate slot layer group 131 between two adjacent second intermediate slot layer groups 132. When there are multiple first intermediate slot layer units and multiple second intermediate slot layer units, there is one second intermediate slot layer unit between two adjacent first intermediate slot layer units, and one first intermediate slot layer unit between two adjacent second intermediate slot layer units.

[0093] For example, taking a set of first intermediate slot layer units and a set of second intermediate slot layer units arranged radially adjacently, each phase winding of the stator winding 2 includes two per-stage per-phase windings. Each per-stage 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. Along the radial direction from the inner to the outer side of the stator core 1, the three sets of 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 sets of second intermediate slot layer groups 132 are respectively the first second intermediate slot layer group 132, the second second intermediate slot layer group 132, and the third second intermediate slot layer group 132. Thus, the six adjacent stator slots 11 corresponding to each pole and each phase winding are denoted as a per-stage per-phase slot region 10, which facilitates the same arrangement area of ​​the same phase winding segment in any two adjacent per-stage per-phase slot regions 10. In each phase winding of the stator winding 2, one end of a portion of the first winding segment 21 is located within it. One end of a first intermediate slot layer group 131 in one of the per-stage per-phase slot regions 10 is located within the slot layer 12 of the third first intermediate slot layer group 131 in another per-stage per-phase slot region 10; one end of a portion of the first winding segment 21 is located within the slot layer 12 of the third first intermediate slot layer group 131 in one of the aforementioned per-stage per-phase slot regions 10, and the other end is located within the slot layer 12 of the aforementioned other first second intermediate slot layer group 132; one end of a portion of the first winding segment 21 is located within the slot layer 12 of the first second intermediate slot layer group 132 in one of the aforementioned per-stage per-phase slot regions 10, and the other end is located within the slot layer 12 of the aforementioned other second second intermediate slot layer group 132. Similarly, it can be understood that the first intermediate slot layer units and the second intermediate slot layer units are arranged alternately in the radial direction.

[0094] In some examples, combined Figure 7The first intermediate groove layer group 131 and the second intermediate groove layer group 132 are arranged alternately in the radial direction. At this time, there can be one or more first intermediate groove layer groups 131 and one or more second intermediate groove layer groups 132. Example 1: There are multiple first intermediate slot layer groups 131 and multiple second intermediate slot layer groups 132. In the radial direction of the stator core 1, a second intermediate slot layer group 132 is provided between two adjacent first intermediate slot layer groups 131, 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 radially. The first intermediate slot layer group 131 is provided 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 radially. The second intermediate slot layer group 132 is provided 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, which are arranged radially. Therefore, the distance between the two ends of the first winding segment 21 can be smaller, that is, the two ends of the first winding segment 21 are located in two adjacent slot layers 12, which can effectively reduce the length of the first winding segment 21 and reduce costs.

[0095] For example, combining Figure 7 and Figure 8 Each stage of each phase winding is respectively located in six adjacent stator slots 11. Each of the six adjacent stator slots 11 has five sets of first intermediate slot layer groups 131 and five sets of second intermediate slot layer groups 132, and the five sets of first intermediate slot layer groups 131 and five sets of second intermediate slot layer groups 132 are arranged alternately in the radial direction. In the direction from the inner side to the outer side of the stator core 1, the five sets of 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 sets of 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.

[0096] Therefore, the six adjacent stator slots 11 corresponding to each phase winding of each pole are denoted as a slot region. This facilitates ensuring that the arrangement area of ​​the same phase winding segments is the same in any two adjacent slot regions. In two adjacent slot regions, one end of the first winding segment 21 is located in the slot layer 12 of the first second intermediate slot layer group 132 in one slot region, and the other end is located in the slot layer 12 of the second first intermediate slot layer group 131 in another adjacent slot region. Similarly, one end of the second winding segment 21 is located in the slot layer 12 of the second second intermediate slot layer group 132 in one of the aforementioned slot regions, and the other end is located in the slot layer 12 of the second first winding segment 21. In the third first intermediate slot layer group 131 of the other adjacent slot region, one end of the third first winding segment 21 is located in the slot layer 12 of the third second intermediate slot layer group 132 of one of the slot regions, and the other end is located in the slot layer 12 of the fourth first intermediate slot layer group 131 of the other adjacent slot region. One end of the fourth first winding segment 21 is located in the slot layer 12 of the fourth second intermediate slot layer group 132 of one of the slot regions, and the other end is located in the slot layer 12 of the fifth first intermediate slot layer group 131 of the other adjacent slot region.

[0097] In some embodiments of this application, combined with Figures 8-9 , Figures 10-11 and Figure 16 The stator winding 2 also includes a second winding segment 22, which spans y2 stator slots 11 and includes two second slot inner portions 222. Both second slot inner portions 222 of the second winding segment 22 are located in the first slot layer group 13a. y2 satisfies: y-(q-1)≤y2≤y+(q-1).

[0098] The second winding segment 22 spans y2 stator slots 11, meaning the span of the second winding segment 22 is y2. If the multiple stator slots 11 are arranged sequentially in a clockwise or counterclockwise direction, one of the second slot portions 222 of the second winding segment 22 is located at the y-th slot. 21 The groove, another second groove inner portion 222 is located at the yth 22 The slot, then the second winding segment 22 crosses (y 22 -y 21 ) stator slots 11, i.e. y2 = y 22 -y 21 .

[0099] 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; at the same time, it is convenient to realize different settings of the stator winding 2 lead wire 41 or star line 42 through the second span segment 22.

[0100] In some embodiments of this application, q ≥ 4, and each phase of the stator winding 2 includes multiple second winding segments 22. At least one second winding segment 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 of each phase winding are of at least two types. That is, the connection with the first winding segment 21 can be achieved through at least two types of second winding segments 22, i.e., the connection between the second winding segments 22 in the first slot group 13a and the first winding segment 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.

[0101] In some embodiments of this application, combined with Figures 8-9 , Figures 10-11 and Figure 16 The stator winding 2 also includes a third winding segment 23, which spans y3 stator slots 11. The third winding segment 23 includes two inner portions of the third slot. The two inner portions 232 of the third winding segment 23 are both located in the second slot layer group 13b. y3 satisfies: y-(q-1)≤y3≤y+(q-1).

[0102] The third winding segment 23 spans y3 stator slots 11, meaning the span of the third winding segment 23 is y3. If the multiple stator slots 11 are arranged sequentially in a clockwise or counterclockwise direction, the portion 232 within one of the third slots of the second winding segment 22 is located at the yth slot. 31 The groove, another second groove inner portion 232 is located at the yth 32 The slot, then the second winding segment 22 crosses (y 32 -y 31 ) stator slots 11, i.e. y3 = y 32 -y 31 .

[0103] 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; at the same time, it is convenient to realize different settings of the stator winding 2 lead wire 41 or star line 42 through the third winding segment 23.

[0104] For example, combining Figure 3 , Figure 8 and Figure 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 constitute a winding group 2. Each phase of the stator winding 2 includes multiple winding groups 2, and each winding group 2 is located in the slot layer 12 between the innermost slot layer 12 and the outermost slot layer 12. The first winding segments 21 are cross-layer (crossing two adjacent slot layers 12). Each winding group 2 winds from the radially outer side to the radially inner side of the stator core 1. The two inner portions of the second slot of the second winding segment 22 are both located in the innermost slot layer 12, and the two inner portions 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 cross-layer. Thus, the corresponding two winding groups 2 can be connected through the second winding segment 22 and the third winding segment 23 to realize the series connection of multiple winding groups 2 and realize the arrangement of each phase winding. It should be noted that the innermost groove layer 12 is the groove opening layer, for example, the innermost groove layer 12 is the a-th layer, and the outermost groove layer 12 is the groove bottom layer, for example, the outermost groove layer 12 is the j-th layer.

[0105] In some embodiments of this application, 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, thus reducing the assembly difficulty of the stator winding 2 and facilitating mass production of the stator winding 2.

[0106] 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.

[0107] 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, q=4, each phase of the stator winding 2 includes two types of second winding segments 22, one type with a span y2=y-3 and the other type with a span y2=y+1, and each phase of the stator winding 2 includes one type of third winding segment 23 with a span y3=y-3.

[0108] 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 can reduce the types of winding segments of stator winding 2, which is conducive to reducing the assembly difficulty of stator winding 2 and facilitating the mass production of stator winding 2.

[0109] In some embodiments of this application, combined with Figure 7 and Figures 20-22 Each phase of the stator winding 2 includes six branches 4. Multiple first winding segments 21 connected in series radially constitute a winding group 2. Each phase and each branch of the stator winding 2 includes at least one winding unit connected in series. This winding unit includes a second winding segment 22 connected in series, two circumferentially spaced winding groups 2, and a third winding segment 23. The span of the multiple first winding segments 21 in each winding group 2 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.

[0110] For example, combining Figure 3 , Figures 7-9Each phase of the stator winding 2 includes six branches 4. 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 circumferentially spaced winding groups 2, and a third winding segment 23. Each winding group 2 includes multiple first winding segments 21 connected in series radially. Each second winding segment 22 is used to connect the two winding groups 2 of the same winding unit in series. One third winding segment 23 is used to connect one winding group 2 of one winding unit, and the other third winding segment 23 is used to connect the other winding group 2 of one winding unit and one winding group 2 of another winding unit. The connection method of the two series-connected winding units is: third winding segment 23 → one winding group 2 →

[0111] Second winding segment 22 → a set of winding groups 2 → third winding segment 23 → a set of winding groups 2 → second winding segment 22 → a set of winding groups 2. Thus, each phase and each path of the stator winding 2 is wound twice on the stator core 1 to achieve the arrangement of each phase and each path of the stator winding 2.

[0112] In some embodiments of this application, the span of the first winding segment 21 of the two winding groups 2 in the winding unit is equal. This simplifies the arrangement of the winding unit, and the equal span of the first winding segment 21 of the two winding groups 2 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 2 in the winding unit can also be unequal.

[0113] In some embodiments of this application, combined with Figures 7-9 and Figure 20z = 72, 2p = 6, m = 3, q ​​= 4. Each stator slot 11 has 10 slot layers 12, which are layers a to j respectively. The 72 stator slots 11 are slots 1 to 72 respectively. Each phase of the stator winding 2 includes 6 branches 4. The winding path of the first branch of the first phase of the 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→46 c→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→2 4f→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, the number in "1j" corresponds to stator slot 11, and the letter corresponds to slot layer 12.

[0114] For example, combined Figure 8 and Figure 9 Stator winding 2 includes three phases, the first phase being the U phase of stator winding 2. The winding route of the first branch of the U phase of stator winding 2 is as follows:

[0115] 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).

[0116] The winding path of the second branch of phase U of stator winding 2 is as follows:

[0117] 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).

[0118] The winding path of the third branch of phase U of stator winding 2 is as follows:

[0119] 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).

[0120] The winding route of the fourth branch of phase U of stator winding 2 is as follows:

[0121] 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).

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

[0123] 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).

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

[0125] 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).

[0126] Specifically, the stator winding 2 has a pitch y = 12, the first winding segment 21 has a span of 10, the second winding segment 22 has two spans of 9 and 13 respectively, and the third winding segment 23 has a span of 11. Each phase 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 This is the current waveform diagram of branch 4 of the 6 branches of phase U.

[0127] 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 2, and a third winding segment 23. Each winding group 2 includes four first winding segments 21 connected in series radially. The four winding groups 2 are: the first winding group 2 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); the second winding group 2 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); and the first winding segment 21 (24i→14h) → the first winding segment 21 (22i→14h). The third winding group 2, consisting of segment 21 (24g→14f) → first winding segment 21 (24e→14d) → first winding segment 21 (24c→14b), and the fourth winding group 2, consisting of first winding segment 21 (1b→11c) → first winding segment 21 (1d→11e) → first winding segment 21 (1f→11g) → first winding segment 21 (1h→11i), corresponds to one winding unit in the first and second winding groups 2, and to the other winding unit in the third and fourth winding groups 2. One end of the third winding segment 23 (1j→12j) is connected to the first winding group 2. The two ends of the second winding segment 22 (22a→13a) are connected to the first winding group 2 and the second winding group 2, respectively. The two ends of the third winding segment 23 (3j→14j) are connected to the second winding group 2 and the third winding group 2, respectively. The two ends of the second winding segment 22 (24a→11a) are connected to the third winding group 2 and the fourth winding group 2, respectively. Similarly, the windings of other branches 4 and other phases can also be obtained.

[0128] 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 described in detail here.

[0129] Optionally, one end of the winding segment corresponding to 1j, 2b, 25j, 26b, 49j, and 50b can be formed as a lead wire 41. Among them, the lead-out lines 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-out lines 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-out lines 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-out lines 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-out lines 41 corresponding to the fifth branch of each phase U, V, and W are 8 stator slots 11 apart in the circumferential direction; and the lead-out lines 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.

[0130] Specifically, the lead wire 41 of each branch 4 of phase U differs from the lead wire 41 of the corresponding branch 4 of phase V by 8 stator slots 11 in the circumferential direction. For example, the lead wire 41 of the first branch of phase U differs from the lead wire 41 of the first branch of phase V by 8 stator slots 11 in the circumferential direction. The lead wire 41 of each branch 4 of phase V differs from the lead wire 41 of the corresponding branch 4 of phase W by 8 stator slots 11 in the circumferential direction. For example, the lead wire 41 of the first branch of phase V differs from the lead wire 41 of the first branch of phase W by 8 stator slots 11 in the circumferential direction. The lead wire 41 of each branch 4 of phase W differs from the lead wire 41 of the corresponding branch 4 of phase U by 8 stator slots 11 in the circumferential direction. For example, the lead wire 41 of the first branch of phase W differs from the lead wire 41 of the first branch of phase U by 8 stator slots 11 in the circumferential direction. The lead wires 41 of the first and second, third and fourth, fifth and sixth branches of phase U are separated by 1 stator slot 11 in the circumferential direction, and the first and third branches of phase U are separated by 24 stator slots 11 in the circumferential direction. The lead wires 41 of the first and second, third and fourth, fifth and sixth branches of phase V are separated by 1 stator slot 11 in the circumferential direction, and the first and third branches of phase V are separated by 24 stator slots 11 in the circumferential direction. The lead wires 41 of the first and second, third and fourth, fifth and sixth branches of phase W are separated by 1 stator slot 11 in the circumferential direction, and the first and third branches of phase W are separated 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).

[0131] For example, the winding path of the first branch of phase V of stator winding 2 is as follows:

[0132] 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.

[0133] The winding path of the second branch of phase V of stator winding 2 is as follows:

[0134] 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;

[0135] The winding path of the third branch of phase V of stator winding 2 is as follows:

[0136] 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;

[0137] The winding path of the fourth branch of phase V of stator winding 2 is as follows:

[0138] 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;

[0139] The winding path of the fifth branch of phase V of stator winding 2 is as follows:

[0140] 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;

[0141] The winding path of the sixth branch of phase V of stator winding 2 is as follows:

[0142] 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.

[0143] For example, the winding path of the first branch of phase W of stator winding 2 is as follows:

[0144] 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.

[0145] The winding path of the second branch of phase W in stator winding 2 is as follows:

[0146] 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;

[0147] The winding path of the third branch of phase W of stator winding 2 is as follows:

[0148] 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;

[0149] The winding path of the fourth branch of phase W of stator winding 2 is as follows:

[0150] 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;

[0151] The winding path of the fifth branch of phase W of stator winding 2 is as follows:

[0152] 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;

[0153] The winding path of the sixth branch of phase W of stator winding 2 is as follows:

[0154] 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.

[0155] Optionally, the leads 41 of 1j, 2b, 25j, 26b, 49j, and 50b can be extended as the positive leads of the U phase, the leads 41 of 9j, 10b, 33j, 34b, 57j, and 58b can be extended as the positive leads of the V phase, the leads 41 of 17j, 18b, 41j, 42b, 65j, and 66b can be extended as the positive leads of the W phase, and the star-point 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-point lines 42 of the U, V, and W phases are not limited to this.

[0156] In some embodiments of this application, combined with Figure 1 and Figures 17-19Each phase and 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. 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.

[0157] Optionally, 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.

[0158] In some embodiments of this application, combined with Figure 23 Multiple branches 4 satisfy at least one of the following conditions: Condition A1, the second end 4b of at least one branch 4 is located in the innermost slot layer 12, and the first end 4a is located in the slot layer 12 adjacent to the innermost slot layer 12; Condition A2, the first end 4a of at least one branch 4 is located in the outermost slot layer 12, and the second end 4b is located in the slot layer 12 adjacent to the outermost slot layer 12; Condition A3, the first end 4a of two adjacent branches 4 of the same phase is located in the outermost slot layer 12 and the slot layer 12 adjacent to the innermost slot layer 12, respectively; Condition A4, the first end 4a of two adjacent branches 4 of the same phase is located in the outermost slot layer 12 and the innermost slot layer 12, respectively. Therefore, the lead wires 41 and star wires 42 of each phase branch 4 can have multiple configurations, which facilitates the application of the stator assembly 100 design requirements and improves the applicability of the stator assembly 100.

[0159] 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.

[0160] Furthermore, for a single branch 4, its lead wire 41 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. The end where the first bent portion 211 is located can be the 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.

[0161] Optionally, 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.

[0162] In some embodiments of this application, combined with Figures 12-15 The lead wire 41 and star line 42 of each branch 4 are located at the same end of the axial direction of the stator core 1. It can be understood that the lead wire 41 and star line 42 of each 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. 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. The end where the first bent portion 211 is located can be the 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 and star line 42 of each branch 4 can be located at the hairpin end or at the welding end.

[0163] 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 in sequence are welded together at the end away from the first bent portion 211. 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.

[0164] 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 easy 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.

[0165] In some technologies, the more slot layers a stator slot has, the more layers the winding segment within the slot has (e.g., more flat wire layers). When the stator assembly and housing (e.g., motor housing) are typically fitted with an interference fit, and to ensure a suitable gap between adjacent welded ends (e.g., weld gap), the stator core needs a large radial yoke space. Therefore, in the embodiments of this application, the stator winding 2's lead wire 41 uses a combination of the outermost slot layer 12 and the innermost slot layer 12, which effectively saves radial space in the stator core and helps reduce the motor's size.

[0166] For example, combining Figure 3 , Figure 7 Each phase winding includes multiple branches 4 ( Figure 7 The circuit consists of a branch 4 for each phase U1, a branch 4 for each phase U2, a branch 4 for each phase U3, a branch 4 for each phase U4, a branch 4 for each phase U5, and a branch 4 for each phase U6. Each branch 4 includes multiple first winding segments 21 connected in series. The first slot portion 212 of one of 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, thus forming a welded end between two adjacent first winding segments 21 to achieve the series connection of two adjacent first winding segments 21.

[0167] Optionally, the first winding segment 21 can be configured to be generally U-shaped and include 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. The end containing the first bent portion 211 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 both ends of the second bent portion 221. Each second groove portion 223 has a second connecting portion 224 at one end away from the second bent portion 221 for welding with other first winding segments 21, etc. The third winding segment 23 includes a third bent portion 231 and two third groove portions 232 respectively connected to both ends of the third bent portion 231. Each third groove portion 233 has a third connecting portion 234 at one end away from the third bent portion 231 for welding with other first winding segments 21, etc.

[0168] For example, combining Figure 4 and Figures 8-9The stator slot 11 has 10 slot layers 12, which include layers a, b, c, d, e, f, g, h, i, and j arranged sequentially from the radial inside to the outer side. Each phase winding includes two winding units, and each winding unit includes a second winding segment 22 arranged in series, two sets of circumferentially spaced winding groups 2, and a third winding segment 23. Each winding group 2 includes four first winding segments 21, which are respectively the first first winding, the second first winding, the third first winding, and the fourth first winding from the radial inside to the radial outside. For the winding, the first winding segment 21 has its first slot portion 212 located in layer b, and the other second slot portion 212 located in layer c. The second winding segment 21 has one first slot portion 212 located in layer d, and the other first slot portion 212 located in layer e. The third winding segment 21 has its first slot portion 212 located in layer f, and the other first slot portion 212 located in layer g. The fourth winding segment 21 has its first slot portion 212 located in layer h, and the other 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. Therefore, taking a third winding segment 23, a winding group 2, and a second winding segment 22 arranged in series as an example, the third connecting portion 234 of the third winding segment 23 is welded to the first connecting portion 214 of the fourth first winding segment 21; the first connecting portion 214 of the fourth first winding segment 21 is welded to the first connecting portion 214 of the third first winding segment 21; the first connecting portion 214 of the third first winding segment 21 is welded to the first connecting portion 214 of the second first winding segment 21; the first connecting portion 214 of the second first winding segment 21 is welded to the first connecting portion 214 of the first first winding segment 21; and the first connecting portion 214 of the first first winding segment 21 is welded to the second connecting portion 224 of the second winding segment 22. Optionally, the winding group 2 includes multiple first winding segments 21 connected in series radially from one side to the other along the stator core 1. The multiple first winding segments 21 have the same span but different structures. For example, combining... Figure 8 and Figure 12 The first winding segment 21 crosses layers b and c, and the span of the first winding segment 21 is 10; combined with Figure 8 and Figure 13 The second first winding segment 21 crosses the d-th and e-th layers, and the span of the second first winding segment 21 is 10; combined with Figure 8 and Figure 14 The third first winding segment 21 crosses the f-th and g-th layers, and the span of the third first winding segment 21 is 10; combined with Figure 8 and Figure 15The fourth first winding segment 21 crosses the h-th and i-th layers, and the span of the fourth first winding segment 21 is 10.

[0169] For example, combining Figure 1 and Figures 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-stage per-phase slot region 10. The same slot layer 12 in the six adjacent stator slots 11 form 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 in the radial direction. 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. Similarly, the windings of each stage and 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 one side of the full pitch to 5 stator slots 11 on one side of the 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). This design, combining long and short-pitch winding segments (e.g., first winding segment 21, second winding segment 22, and third winding segment 23), effectively reduces the height of the winding segments, thus lowering the end height of the stator winding 2. This reduces the resistance and copper loss of the stator winding and improves efficiency. Simultaneously, it effectively avoids significant modifications to the winding segments (e.g., the hairpin) when subsequent adjustments to the number of branches per phase are needed. 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 examples of this application, 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 the 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.

[0170] For example, combining Figure 3 , Figure 7 , Figures 17-22 The stator winding 2 has three phase windings, each phase winding has six branches 4, and the two ends of each phase branch 4 are a first end 4a and a second end 4b, respectively. Among them, 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 six leads 41 of the same phase are connected together, and the 18 star lines 42 are connected together to form a star connection.

[0171] Secondly, embodiments of this application provide an electric motor, including a stator assembly 100 according to the first aspect embodiment described above. Exemplarily, the motor may be a flat wire motor.

[0172] In the above technical solution, the performance of the motor can be improved by adopting the stator assembly 100.

[0173] Thirdly, embodiments of this application provide an electric powertrain including a motor according to the second aspect of the present invention described above.

[0174] In the above technical solution, by adopting the aforementioned motor, the performance of the electric powertrain can be improved.

[0175] Fourthly, embodiments of this application provide a vehicle including a motor according to the second aspect embodiment of the present invention or an electric powertrain according to the third aspect embodiment of the present invention.

[0176] In the above technical solutions, the NVH performance of the vehicle can be improved by adopting the aforementioned motor or electric assembly.

[0177] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention 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 the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0178] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0179] 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 the invention. 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.

[0180] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A stator assembly suitable for use in a z-slot 2p-stage m-phase motor, wherein, y = z / (2p), the number of slots per pole per phase is q = z / m / (2p), characterized in that the stator assembly includes: A stator core having a plurality of stator slots spaced apart circumferentially along the stator core, each stator slot having a plurality of slot layers arranged sequentially radially along the stator core, the same slot layer 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; The stator winding includes a first winding segment that spans y1 stator slots. The first winding segment includes two inner portions within the first slots, which are respectively located within adjacent intermediate slot layers. 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, characterized in that, y1 satisfies: y1+x1=y.

3. The stator assembly according to claim 1, characterized in that, The stator winding includes multiple segments of the first winding, and the span of the multiple segments of the first winding is equal.

4. The stator assembly according to claim 1, characterized in that, The stator slot has at least 10 slot layers.

5. The stator assembly according to claim 1, characterized in that, Each phase of the stator winding includes multiple branches, and each branch includes multiple first winding segments arranged radially in sequence. The corresponding first slot portions of two adjacent first winding segments are located in the same stator slot. One end of each first slot portion has a first connecting portion. The two first connecting portions of each first winding segment extend in the circumferential direction toward each other. The corresponding first connecting portions of two adjacent first winding segments are connected to each other so that the two adjacent first winding segments are connected in series.

6. The stator assembly according to claim 1, characterized in that, The plurality of intermediate slot layer groups include a first intermediate slot layer group and a second intermediate slot layer group arranged radially. Within the same magnetic pole, the in-phase windings of the stator windings in the first intermediate slot layer group and the second intermediate slot layer group are circumferentially offset by x1 stator slots.

7. The stator assembly according to claim 6, characterized in that, There are multiple first intermediate trench layer groups and multiple second intermediate trench layer groups. Multiple first intermediate trench layer groups are arranged adjacently to form a first intermediate trench layer unit, and multiple second intermediate trench layer groups are arranged adjacently to form a second intermediate trench layer unit. The first intermediate trench layer units and the second intermediate trench layer units are arranged alternately along the radial direction; or... The first intermediate trench layer group and the second intermediate trench layer group are arranged alternately in the radial direction.

8. The stator assembly according to claim 1, characterized in that, The stator winding further includes a second winding segment, which spans y2 stator slots. The second winding segment includes two inner portions of the second slot, both of which are located in the first slot layer group. y2 satisfies: y-(q-1)≤y2≤y+(q-1).

9. The stator assembly according to claim 8, characterized in that, q≥4, each phase of the stator winding includes multiple second winding segments, at least one second winding segment 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 claim 1, characterized in that, The stator winding further includes a third winding segment, which spans y3 stator slots. The third winding segment includes two inner portions of the third slot, both of which are located in the second slot layer group. y3 satisfies: y-(q-1)≤y3≤y+(q-1).

11. The stator assembly according to claim 10, characterized in that, 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 claim 1, characterized in that, 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→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→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.

13. The stator assembly according to any one of claims 1-12, characterized in that, Each phase of the stator winding includes multiple branches, with a first end and a second end at each end of the branch. 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 slot layers.

14. The stator assembly according to claim 13, characterized in that, Multiple branches satisfy at least one of the following conditions: Condition A1: The second end of at least one branch is located in the innermost trench layer, and the first end is located in the trench layer adjacent to the innermost trench layer. Condition A2: The first end of at least one branch is located in the outermost groove layer, and the second end is located in the 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 trench layer and the trench layer adjacent to the innermost trench 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 according to claim 14, characterized in that, The lead-out line and the star line of each branch are located at the same end of the axial direction of the stator core.

16. An electric motor, characterized in that, Includes the stator assembly according to any one of claims 1-15.

17. An electric powertrain, characterized in that, Includes the motor according to claim 16.

18. A vehicle, characterized in that, Includes the motor according to claim 16 or the electric assembly according to claim 17.

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