Motor stator, motor and vehicle

Abstract

The invention relates to a motor stator, a motor and a vehicle, the motor stator comprises a stator core and M phases of stator windings, S core slots are arranged on the inner circumferential surface of the stator core at intervals, each core slot comprises N slot layer groups, each slot layer group comprises two layers, each phase of stator winding comprises a branches which are connected in parallel, each branch comprises a U-shaped hairpins, and each U-shaped hairpin comprises a U-shaped hairpins. The plurality of U-shaped hairpins comprise a first short-distance hairpin, a second short-distance hairpin, a first long-distance hairpin and a second long-distance hairpin which have different pitches, and only the first short-distance hairpin and the first long-distance hairpin are arranged in each groove layer group, or only the second short-distance hairpin and the second long-distance hairpin are arranged in each groove layer group; and at least one layer in each phase of stator winding is staggered from the other layer in the circumferential direction. Through the equivalent short distance, the plurality of branches of the stator winding of each phase can be uniformly distributed and the current is balanced, so that the effect of reducing the noise of a specific order is realized, the ring current among the branches is avoided, the harmonic wave during the operation of the motor is effectively reduced, and the NVH performance is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of motors, and in particular, to a motor stator, a motor, and a vehicle. Background Art

[0002] In order to achieve higher power torque density, the stator winding of electric vehicle drive motors is usually designed with a multi-branch parallel structure in one phase. Currently, multiple branches under one phase of the stator winding of the motor are led out in adjacent slots under one pole, which will cause a potential difference between each branch and each phase, thereby generating current to form a circulating current, which has an adverse effect on the NVH performance of the motor. Summary of the invention

[0003] An object of the present disclosure is to provide a motor stator, a motor and a vehicle to at least partially solve the problems existing in the related art.

[0004] In order to achieve the above object, the present disclosure provides a motor stator for a motor with a rotor pole number of 2P, wherein the motor stator comprises a stator core and an M-phase stator winding, wherein the stator core is annular and has S core slots arranged at intervals on the inner circumference, each of the core slots comprises N slot layer groups distributed in sequence, each of the slot layer groups comprises two layers, Each phase stator winding includes a parallel branches, each of which includes a plurality of U-shaped hairpins connected in sequence, and the plurality of U-shaped hairpins include a first short-distance hairpin, a second short-distance hairpin, a first long-distance hairpin, and a second long-distance hairpin with different pitches. The pitch difference between the first short-distance hairpin and the first long-distance hairpin is 4, and the pitch difference between the second short-distance hairpin and the second long-distance hairpin is 4. Each slot layer group is provided with only the first short-distance hairpin and the first long-distance hairpin across layers, or only the second short-distance hairpin and the second long-distance hairpin across layers, And wherein, at least one layer in each phase stator winding is staggered relative to another layer in the circumferential direction.

[0005] Optionally, the pitch of the first short-distance card issuance is Y-2, the pitch of the first long-distance card issuance is Y+2, the pitch of the second short-distance card issuance is Y-1, and the pitch of the second long-distance card issuance is Y+3, wherein Y=S / 2P.

[0006] Optionally, the first short-distance hairpins and the first long-distance hairpins are alternately arranged in sequence in the corresponding slot layer groups. The second short-distance hairpins and the second long-distance hairpins are alternately arranged in sequence in the corresponding slot layer groups.

[0007] Optionally, the pitches of the U-shaped hairpins in two adjacent groove layer groups are different from each other.

[0008] Optionally, each of the core slots includes three slot layer groups distributed in sequence, the first layer, the second layer and the third layer in each phase stator winding are aligned in the circumferential direction, and the fourth layer, the fifth layer and the sixth layer are aligned in the circumferential direction and staggered with the first layer, the second layer and the third layer.

[0009] Optionally, the first short-distance hairpins and the first long-distance hairpins are alternately arranged in the first layer and the second layer in sequence; The second short-distance hairpins and the second long-distance hairpins are alternately arranged in the third layer and the fourth layer in sequence; and The first short-distance hairpins and the first long-distance hairpins are alternately arranged in the fifth layer and the sixth layer.

[0010] Optionally, the pitch between any two connected U-shaped hairpins is Y or Y-1.

[0011] Optionally, the effective edges of the U-shaped hairpin located in the first layer, the second layer and the third layer are twisted obliquely by 6 slots when connected with the effective edge of another U-shaped hairpin; The effective edges of the U-shaped hairpin located in the fourth layer and the sixth layer are tilted by 5 slots when connected with the effective edge of another U-shaped hairpin; and The effective edge of the U-shaped hairpin located in the fifth layer is twisted obliquely by 7 slots when connected with the effective edge of another U-shaped hairpin.

[0012] Optionally, each phase stator winding includes a plurality of hairpin groups connected in sequence, each of the hairpin groups includes four U-shaped hairpins connected in parallel so that each phase stator winding includes four branches connected in parallel, the four branches include a first sub-winding wound from the first layer to the sixth layer, and a second sub-winding wound from the sixth layer to the first layer, When the four adjacent core slots occupied by the four effective sides of each card issuing group located on the same layer are defined as q1, q2, q3 and q4: The first branch of the four branches has a portion corresponding to the first sub-winding occupying q1 and q3, and a portion corresponding to the second sub-winding occupying q2 and q4; The part of the second branch of the four branches corresponding to the first sub-winding occupies q2 and q4, and the part corresponding to the second sub-winding occupies q1 and q3; The portion of the third branch of the four branches corresponding to the first sub-winding occupies q3 and q1, and the portion corresponding to the second sub-winding occupies q4 and q2; and The portion of the fourth branch of the four branches corresponding to the first sub-winding occupies q4 and q2, and the portion corresponding to the second sub-winding occupies q3 and q1.

[0013] Optionally, the first ends of the two effective sides of the U-shaped hairpin are interconnected to form a molded end, and the second end is twisted obliquely to be constructed as a welding end connected to another U-shaped hairpin, wherein the molded ends of the first long-distance hairpin and the second long-distance hairpin are constructed to be flat.

[0014] Optionally, a 3-phase stator winding is included, the number of the core slots is 72, and the number of slots per pole and per phase of the motor stator is 4.

[0015] According to a second aspect of the present disclosure, a motor is provided, comprising the above-mentioned motor stator.

[0016] According to a third aspect of the present disclosure, a vehicle is provided, comprising the above-mentioned motor.

[0017] Through the above technical solution, a motor stator in the form of short-pitch winding is provided, in which at least one layer of each phase stator winding is staggered from another layer in the circumferential direction, that is, a short-pitch winding form is formed. Through the equivalent short pitch, multiple branches of the stator winding of each phase can be evenly distributed and the current is balanced, thereby avoiding the circulation between the branches, changing the distribution of electromagnetic force, achieving the effect of reducing the noise of a specific order, effectively reducing the harmonics of a specific order when the motor is running, and improving the NVH performance of a specific order. Fig. 9 According to the two sets of simulation effect diagrams, it can be seen that the motor stator with short-pitch winding provided by the present invention can effectively reduce the motor decibel and force density compared to the traditional full-pitch winding form, and has a significant effect on improving the motor NVH performance.

[0018] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is an arrangement diagram of a stator winding in a full-pitch winding form exemplarily shown in the present disclosure; Figure 2 is an arrangement diagram of a stator winding in a short-pitch winding form exemplarily shown in the present disclosure; Figure 3 yes Figure 2 An expanded view of the stator winding shown in FIG. Figure 4 is a schematic diagram of a motor stator exemplarily shown according to the present disclosure; Figure 5 yes Figure 4 A front view of a stator winding of a motor stator shown in FIG. Figure 6 yes Figure 4 A top view of the stator winding of the motor stator shown in FIG. Figure 7 yes Figure 4 A top view of a stator core of a motor stator shown in FIG. Figure 8 is a schematic diagram exemplarily showing a U-shaped hairpin according to the present disclosure; Fig. 9 The figure is a performance simulation comparison diagram showing, according to the present disclosure, a short-pitch winding form and a full-pitch winding form.

[0020] Description of Reference Numerals 1- stator core; 11- core slot; 2- slot layer group; 21- first layer; 22- second layer; 23- third layer; 24- fourth layer; 25- fifth layer; 26- sixth layer; 3- stator winding; 31- first short-distance hairpin; 32- second short-distance hairpin; 33- first long-distance hairpin; 34- second long-distance hairpin; 301- effective edge; 302- welding end; 303- forming end; 4- hairpin group; 51- first branch; 52- second branch; 53- third branch; 54- fourth branch. DETAILED DESCRIPTION

[0021] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0022] In the present disclosure, the terms "first", "second", etc. are used to distinguish one element from another element, and do not have order and importance. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0023] Reference Figure 2-Figure 8The present disclosure exemplarily shows a motor stator for a motor with a rotor pole number of 2P, such as 2 poles, 4 poles, 6 poles, 8 poles, etc. The motor stator includes a stator core 1 and M-phase stator windings 3, such as 3-phase stator windings 3, 5-phase stator windings 3, 6-phase stator windings 3, etc. The stator core 1 is constructed in an annular shape and has S core slots 11 arranged at intervals on the inner circumference, such as 54 core slots 11, 72 core slots 11, etc. Each core slot 11 includes N slot layer groups 2 distributed in sequence, such as 2, 3, 4, etc., and each slot layer group 2 includes two layers, that is, in the embodiment of the present disclosure, the first layer and the second layer can constitute the first slot layer group, the third layer and the fourth layer can constitute the second slot layer group, the fifth layer and the sixth layer can constitute the third slot layer group, and so on, while the second layer and the third layer, the fourth layer and the fifth layer do not constitute the slot layer group 2. Each phase stator winding 3 includes a parallel branches, for example, 4, 5, etc. Each branch includes a plurality of U-shaped hairpins connected in sequence, and the plurality of U-shaped hairpins include a first short-distance hairpin 31, a second short-distance hairpin 32, a first long-distance hairpin 33, and a second long-distance hairpin 34 with different pitches, that is, the pitches of the four hairpins are all different. The pitch difference between the first short-distance hairpin 31 and the first long-distance hairpin 33 is 4, and the pitch difference between the second short-distance hairpin 32 and the second long-distance hairpin 34 is 4. In each slot layer group 2, only the first short-distance hairpin 31 and the first long-distance hairpin 33 across the layer are provided, or only the second short-distance hairpin 32 and the second long-distance hairpin 34 across the layer are provided. And wherein, at least one layer of each phase stator winding 3 is staggered with another layer in the circumferential direction, specifically, one layer of each phase stator winding 3 can be staggered with other multiple layers in the circumferential direction, or multiple layers can be staggered with other multiple layers, etc., as long as one layer is staggered with another layer to form a short-distance winding form. Here, "staggered" means that there is at least one core slot 11, at least one slot layer of which is arranged with a stator winding 3, and at least one slot layer is not arranged with a stator winding 3, and a layer of stator winding 3 corresponding to the slot layer without the stator winding 3 is staggered with other stator winding layers arranged in the core slot 11.

[0024] In order to facilitate the understanding of the "circumferential staggering" of the present disclosure to form a "short-pitch winding form", refer to Figure 1 and Figure 2 ,in, Figure 1 The conventional full-pitch winding is shown, that is, the multiple layers of the stator winding 3 of each phase are aligned in the circumferential direction, in which case D2=8. Figure 2 The short-pitch winding of the present disclosure is shown, in which the first to third layers and the fourth to fifth layers are staggered in the circumferential direction. In this case, D1=7, which is smaller than D2 of the traditional full-pitch winding, so it is called a short-pitch winding form.

[0025] By using the above technical solution, a motor stator in the form of short-pitch winding is provided, in which at least one layer of each phase stator winding 3 is staggered from another layer in the circumferential direction, that is, a short-pitch winding form is formed. Through the equivalent short pitch, multiple branches of the stator winding 3 of each phase can be evenly distributed and the current is balanced, so as to achieve the effect of reducing the specific order, thereby avoiding the circulating current between the branches, effectively reducing the harmonics during the operation of the motor, and improving the NVH performance. Fig. 9 According to the two sets of simulation effect diagrams, it can be seen that the motor stator with short-pitch winding provided by the present invention can effectively reduce the motor decibel and force density compared to the traditional full-pitch winding form, and has a significant effect on improving the motor NVH performance.

[0026] The present disclosure does not limit the specific pitches of the first short-distance card 31, the second short-distance card 32, the first long-distance card 33, and the second long-distance card 34. Figure 2-Figure 3 In the illustrated embodiment, the pitch of the first short-distance hairpin 31 may be Y-2, the pitch of the first long-distance hairpin 33 may be Y+2, the pitch of the second short-distance hairpin 32 may be Y-1, and the pitch of the second long-distance hairpin 34 may be Y+3, wherein Y=S / 2P, i.e., Y is a full pitch, for example, when the number of core slots 11 is 72 and the number of rotor poles is 6, Y=72 / 6=12, in which case, the pitch of the first short-distance hairpin 31 is 10, the pitch of the second short-distance hairpin 32 is 11, the pitch of the first long-distance hairpin 33 is 14, and the pitch of the second long-distance hairpin 34 is 15. The pitch selection of each U-shaped hairpin may be comprehensively designed according to the total number of core slots 11, the number of phases of the motor, etc., and the present disclosure is not limited to the above embodiment.

[0027] The present disclosure does not limit the arrangement of the two hairpins in each slot layer group 2. For example, Figure 2 and Figure 3 In the illustrated embodiment, the first short-distance hairpin 31 and the first long-distance hairpin 33 can be arranged alternately in the corresponding slot layer group 2. The second short-distance hairpin 32 and the second long-distance hairpin 34 are arranged alternately in the corresponding slot layer group 2. This form of "alternating arrangement" is conducive to balancing the entire stator winding 3. By selecting hairpins with different pitches, staggered layers are formed between different layers of windings, thereby forming a short-distance winding effect and improving the NVH performance of the motor.

[0028] Reference Figure 2 and Figure 3In the embodiment of the present disclosure, the pitches of the U-shaped hairpins in two adjacent slot layer groups 2 are different from each other, that is, one of them is only provided with the first short-distance hairpin 31 and the first long-distance hairpin 33, and the other is only provided with the second short-distance hairpin 32 and the second long-distance hairpin 34. Specifically, the pitch of the two U-shaped hairpins in the first slot layer group 2 is different from the pitch of the two U-shaped hairpins in the second slot layer group 2, the pitch of the two U-shaped hairpins in the third slot layer group 2 is different from the pitch of the two U-shaped hairpins in the second slot layer group 2, and is the same as the pitch of the two U-shaped hairpins in the first slot layer group 2, the pitch of the two U-shaped hairpins in the fourth slot layer group 2 is different from the pitch of the two U-shaped hairpins in the third slot layer group 2, and is the same as the pitch of the two U-shaped hairpins in the second slot layer group 2, and the same can be inferred according to the actual number of slot layer groups 2. Compared with the arrangement in which the pitch of the U-shaped hairpins in each slot layer group 2 is the same, this arrangement is more conducive to the arrangement of short-pitch windings, that is, it is more conducive to making the stator winding 3 of each phase have at least two layers staggered in the circumferential direction, and is conducive to making the stator winding 3 as a whole in a balanced arrangement.

[0029] The present disclosure does not limit which layers of each phase stator winding 3 are staggered in the circumferential direction. Figure 2 and Figure 3 In the illustrated embodiment, N may be equal to 3, that is, each core slot 11 may include three slot layer groups 2 distributed in sequence, the first layer 21, the second layer 22, and the third layer 23 in each phase stator winding 3 may be aligned in the circumferential direction, the fourth layer 24, the fifth layer 25, and the sixth layer 26 may be aligned in the circumferential direction and staggered with the first layer 21, the second layer 22, and the third layer 23. In addition, in some other embodiments, N may be equal to 2, the first layer 21 and the second layer 22 in each phase stator winding 3 may be aligned in the circumferential direction, the third layer 23 and the fourth layer 24 may be aligned in the circumferential direction and staggered with the first layer 21 and the second layer 22, and the present disclosure is not limited thereto.

[0030] In some embodiments, the first short-distance hairpins 31 and the first long-distance hairpins 33 may be arranged alternately in the first layer 21 and the second layer 22. The second short-distance hairpins 32 and the second long-distance hairpins 34 may be arranged alternately in the third layer 23 and the fourth layer 24. The first short-distance hairpins 31 and the first long-distance hairpins 33 may be arranged alternately in the fifth layer 25 and the sixth layer 26. By such a design, the above-mentioned "the fourth layer 24, the fifth layer 25 and the sixth layer 26 may be aligned in the circumferential direction and staggered with the first layer 21, the second layer 22 and the third layer 23" is formed, that is, a short-distance winding is formed.

[0031] Reference Figure 3In the embodiments of the present disclosure, the pitch between any two connected U-shaped hairpins is Y or Y-1 to ensure that the corresponding two U-shaped hairpins can be connected. The pitch specifically refers to the pitch between two mutually connected effective edges 301 of the two connected U-shaped hairpins. "Any two connected U-shaped hairpins" may refer to two located in the same slot layer group 2, or may also refer to two located in different slot layer groups 2. "The pitch between any two connected U-shaped hairpins" can be adaptively designed according to the number of staggered slots of each layer of the short-pitch winding during actual design, for example, in some other embodiments, it can be Y-1 and Y-2.

[0032] Further, refer to Figure 3 In the embodiment of the present disclosure, the effective edge 301 of the U-shaped hairpin located in the first layer 21, the second layer 22 and the third layer 23 can be twisted by 6 slots when connected with the effective edge 301 of another U-shaped hairpin. The effective edge 301 of the U-shaped hairpin located in the fourth layer 24 and the sixth layer 26 can be twisted by 5 slots when connected with the effective edge 301 of another U-shaped hairpin. The effective edge 301 of the U-shaped hairpin located in the fifth layer 25 can be twisted by 7 slots when connected with the effective edge 301 of another U-shaped hairpin. Here, twisting by n slots means that the end of the effective edge 301 is bent toward one side and crosses n core slots 11 to be electrically connected with the effective edge 301 of another U-shaped hairpin. The present disclosure does not limit the number of the above-mentioned twisted slots, as long as it can meet the connection between different layers of the same phase and the U-shaped hairpins in the same layer.

[0033] Reference Figure 2 and Figure 3 In the embodiment of the present disclosure, each phase stator winding 3 may include a plurality of hairpin groups 4 connected in sequence, and each hairpin group 4 may include four U-shaped hairpins connected in parallel so that each phase stator winding 3 includes four branches connected in parallel, and the four branches include a first sub-winding wound from the first layer 21 to the sixth layer 26, and a second sub-winding wound from the sixth layer 26 to the first layer 21, that is, when the four branches are energized, the current flows from the first layer 21 to the sixth layer 26 through the first sub-winding, and flows back from the sixth layer 26 to the first layer 21 through the second sub-winding. Of course, it should be noted that winding from the first layer 21 to the sixth layer 26 here means that after winding in the first slot layer group (the first layer 21 and the second layer 22), the winding enters the second slot layer group (the third layer 23 and the fourth layer 24), and after winding in the second slot layer group, the winding enters the third slot layer group (the fifth layer 25 and the sixth layer 26). The same is true for winding from the sixth layer 26 to the first layer 21, which will not be repeated here. When the four adjacent core slots 11 occupied by the four effective sides 301 of each card issuing group 4 located at the same layer are defined as q1, q2, q3 and q4: The first branch 51 of the four branches may occupy q1 and q3 for the first sub-winding, and q2 and q4 for the second sub-winding; the second branch 52 of the four branches may occupy q2 and q4 for the first sub-winding, and q1 and q3 for the second sub-winding; the third branch 53 of the four branches may occupy q3 and q1 for the first sub-winding, and q4 and q2 for the second sub-winding; and the fourth branch 54 of the four branches may occupy q4 and q2 for the first sub-winding, and q3 and q1 for the second sub-winding. This arrangement facilitates subsequent wiring operations.

[0034] It should be noted that the number of slots occupied by each branch 53 is based on the direction of current flow. For example, the part of the third branch 53 corresponding to the second sub-winding can occupy q4 and q2, which means that the effective edge 301 of each U-shaped hairpin located at q4 is closer to the input end of the entire stator winding 3 than the effective edge 301 located at q2.

[0035] In the embodiment of the present disclosure, the first ends of the two effective sides 301 of the U-shaped hairpin can be connected to each other to form a formed end 303, and the second end can be twisted obliquely to be constructed as a welding end 302 connected to another U-shaped hairpin. Since the formed ends 303 of the two long-distance hairpins are large in size at the end and occupy a large space, in the embodiment of the present disclosure, the formed ends 303 of the first long-distance hairpin 33 and the second long-distance hairpin 34 can be constructed in a flat shape to reduce the size of the end of the stator winding 3. The "flat shape" here can be achieved by selecting flat copper wire instead of traditional round copper wire.

[0036] The present disclosure does not limit the specific parameters of the motor stator. Figure 2 and Figure 3 In the illustrated embodiment, the motor stator may include a three-phase stator winding 3 , the number of core slots 11 is 72, and the number of slots per pole and per phase of the motor stator may be 4.

[0037] In order to facilitate the understanding of the disclosed solution, the following Figure 2-Figure 3 , the specific arrangement of the stator winding 3 of the present disclosure is introduced, specifically: exist Figure 2 and Figure 3In the illustrated embodiment, the arrangement of one phase of the three-phase stator winding 3 is shown, wherein each phase of the stator winding 3 includes four parallel branches, namely, a first branch 51, a second branch 52, a third branch 53 and a fourth branch 54, the number of core slots 11 thereof is 72, the number of slots per pole per phase is 4, the pitch of the first short-distance hairpin 31 is 10, the pitch of the second short-distance hairpin 32 is 11, the pitch of the first long-distance hairpin 33 is 14, the pitch of the second long-distance hairpin 34 is 15, and each core slot 11 is divided into 6 layers in the radial direction. To avoid redundancy, the position of each effective edge 301 is denoted by X / Y below, wherein X represents the core slot 11 number, and Y represents the layer number. Figure 3 From left to right in the figure are No. 1 core slot 11, No. 2 core slot 11, No. 3 core slot 11, etc. The specific winding method of this embodiment is: The first branch 51: It includes a plurality of U-shaped hairpins connected in sequence, each U-shaped hairpin is arranged across layers in the corresponding slot layer group 2. Starting from the incoming line end, the first branch 51 passes through in sequence: 25 / 1-39 / 2-51 / 1-61 / 2-1 / 1-15 / 2-27 / 3-38 / 4-49 / 3-64 / 4-3 / 3-14 / 4-26 / 5-40 / 6-52 / 5-62 / 6-2 / 5-16 / 6-29 / 6-15 / 5-3 / 6-65 / 5-53 / 6-39 / 5-27 / 4-16 / 3-5 / 4-62 / 3-51 / 4-40 / 3-28 / 2-14 / 1-2 / 2-64 / 1-52 / 2-38 / 1. The slot layer position corresponding to each X / Y is arranged with a corresponding effective edge 301. Starting from 25 / 1, each two X / Y form a group and jointly represent the arrangement position of two effective edges 301 of a U-shaped hairpin. Two adjacent U-shaped hairpins are connected obliquely. The parts before and including 16 / 6 belong to the first sub-winding, and the parts after 16 / 6 belong to the second sub-winding. The part of the first branch 51 belonging to the first sub-winding occupies q1 and q3, and the part belonging to the second sub-winding occupies q2 and q4.

[0038] The second branch 52: It includes a plurality of U-shaped hairpins connected in sequence, each U-shaped hairpin is arranged across layers in the corresponding slot layer group 2. Starting from the incoming line end, the second branch 52 passes through in sequence: 26 / 1-40 / 2-52 / 1-62 / 2-2 / 1-16 / 2-28 / 3-39 / 4-50 / 3-65 / 4-4 / 3-15 / 4-27 / 5-41 / 6-53 / 5-63 / 6-3 / 5-17 / 6-28 / 6-14 / 5-2 / 6-64 / 5-52 / 6-38 / 5-26 / 4-15 / 3-4 / 4-61 / 3-50 / 4-39 / 3-27 / 2-13 / 1-1 / 2-63 / 1-51 / 2-37 / 1. Each slot layer corresponding to each X / Y is arranged with a corresponding effective side 301. Starting from 26 / 1, every two X / Ys together represent the arrangement positions of two effective sides 301 of a U-shaped coil. The parts before 17 / 6 and including 17 / 6 belong to the first sub-winding, and the parts after 17 / 6 belong to the second sub-winding. The part of the second branch 52 belonging to the first sub-winding occupies q2 and q4, and the part belonging to the second sub-winding occupies q1 and q3.

[0039] The third branch 53: It includes a plurality of U-shaped hairpins connected in sequence, each U-shaped hairpin is arranged across layers in the corresponding slot layer group 2. Starting from the incoming line end, the third branch 53 passes through in sequence: 27 / 1-37 / 2-49 / 1-63 / 2-3 / 1-13 / 2-25 / 3-40 / 4-51 / 3-62 / 4-1 / 3-16 / 4-28 / 5-38 / 6-50 / 5-64 / 6-4 / 5-14 / 6-27 / 6-17 / 5-5 / 6-63 / 5-51 / 6-41 / 5-29 / 4-14 / 3-3 / 4-64 / 3-53 / 4-38 / 3-26 / 2-16 / 1-4 / 2-62 / 1-50 / 2-40 / 1. Each slot layer corresponding to each X / Y is arranged with a corresponding effective side 301. Starting from 27 / 1, every two X / Ys together represent the arrangement positions of two effective sides 301 of a U-shaped coil. The parts before 14 / 6 and including 14 / 6 belong to the first sub-winding, and the parts after 14 / 6 belong to the second sub-winding. The part of the third branch 53 belonging to the first sub-winding occupies q3 and q1, and the part belonging to the second sub-winding occupies q4 and q2.

[0040] The fourth branch 54: It includes a plurality of U-shaped hairpins connected in sequence, each U-shaped hairpin is arranged across layers in the corresponding slot layer group 2. Starting from the incoming line end, the fourth branch 54 passes through in sequence: 28 / 1-38 / 2-50 / 1-64 / 2-4 / 1-14 / 2-26 / 3-41 / 4-52 / 3-63 / 4-2 / 3-17 / 4-29 / 5-39 / 6-51 / 5-65 / 6-5 / 5-15 / 6-26 / 6-16 / 5-4 / 6-62 / 5-50 / 6-40 / 5-28 / 4-13 / 3-2 / 4-63 / 3-52 / 4-37 / 3-25 / 2-15 / 1-3 / 2-61 / 1-49 / 2-39 / 1. Each slot layer corresponding to each X / Y is arranged with a corresponding effective side 301. Starting from 27 / 1, every two X / Ys together represent the arrangement positions of two effective sides 301 of a U-shaped coil. The parts before 15 / 6 and including 15 / 6 belong to the first sub-winding, and the parts after 15 / 6 belong to the second sub-winding. The part of the fourth branch 54 belonging to the first sub-winding occupies q4 and q2, and the part belonging to the second sub-winding occupies q3 and q1.

[0041] Among them, the four branches respectively include multiple U-shaped hairpins. In order to realize the connection between the corresponding two U-shaped hairpins, the multiple U-shaped hairpins include two types: reverse oblique twist and same direction oblique twist. Figure 3 In this embodiment, the two effective sides 301 of a U-shaped hairpin corresponding to the connection position of the first sub-winding and the second sub-winding can be twisted in the same direction, and the two effective sides 301 corresponding to the other U-shaped hairpins are twisted in opposite directions. Specifically, in the first branch 51, the U-shaped hairpins occupying the two slot layers 29 / 6 and 15 / 5 are twisted in the same direction; in the second branch 52, the U-shaped hairpins occupying the two slot layers 28 / 6 and 14 / 5 are twisted in the same direction; in the third branch 53, the U-shaped hairpins occupying the two slot layers 27 / 6 and 17 / 5 are twisted in the same direction; and in the fourth branch 54, the U-shaped hairpins occupying the two slot layers 26 / 6 and 16 / 5 are twisted in the same direction.

[0042] After understanding Figure 2 and Figure 3 After the specific structure of the embodiment shown, refer to Fig. 9 , the present disclosure provides a simulation comparison diagram between it and the traditional full-pitch winding form, it is not difficult to see that, Figure 2 and Figure 3 The motor stator shown has better NVH performance with lower decibels and force density.

[0043] According to a second aspect of the present disclosure, a motor is provided, comprising the above-mentioned motor stator. Since the motor has all the beneficial effects of the above-mentioned motor stator, they are not described in detail here.

[0044] According to a third aspect of the present disclosure, a vehicle is provided, comprising the above-mentioned motor. Since the vehicle has all the beneficial effects of the above-mentioned motor, they are not described in detail here.

[0045] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0046] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0047] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A motor stator, characterized in that: The invention is used for a motor with a rotor pole number of 2P, wherein the motor stator comprises a stator core and an M-phase stator winding, wherein the stator core is annular in structure and has S core slots arranged at intervals on the inner circumference, each of the core slots comprises N slot layer groups distributed in sequence, and each of the slot layer groups comprises two layers, Each phase stator winding includes a parallel branches, each of which includes a plurality of U-shaped hairpins connected in sequence, and the plurality of U-shaped hairpins include a first short-distance hairpin, a second short-distance hairpin, a first long-distance hairpin, and a second long-distance hairpin with different pitches. The pitch difference between the first short-distance hairpin and the first long-distance hairpin is 4, and the pitch difference between the second short-distance hairpin and the second long-distance hairpin is 4. Each slot layer group is provided with only the first short-distance hairpin and the first long-distance hairpin across layers, or only the second short-distance hairpin and the second long-distance hairpin across layers, And wherein, at least one layer in each phase stator winding is staggered relative to another layer in the circumferential direction.

2. The motor stator according to claim 1, characterized in that: The pitch of the first short-distance card issuance is Y-2, the pitch of the first long-distance card issuance is Y+2, the pitch of the second short-distance card issuance is Y-1, and the pitch of the second long-distance card issuance is Y+3, wherein Y=S / 2P.

3. The motor stator according to claim 2, characterized in that: The first short-distance hairpins and the first long-distance hairpins are alternately arranged in sequence in the corresponding slot layer groups, The second short-distance hairpins and the second long-distance hairpins are alternately arranged in sequence in the corresponding slot layer groups.

4. The motor stator according to claim 3, characterized in that: The pitches of the U-shaped hairpins in two adjacent groove layer groups are different from each other.

5. The motor stator according to claim 3, characterized in that: Each of the core slots includes three slot layer groups distributed in sequence. The first layer, the second layer and the third layer in each phase stator winding are aligned in the circumferential direction, and the fourth layer, the fifth layer and the sixth layer are aligned in the circumferential direction and staggered with the first layer, the second layer and the third layer.

6. The motor stator according to claim 5, characterized in that: The first short-distance hairpins and the first long-distance hairpins are alternately arranged in the first layer and the second layer in sequence; The second short-distance hairpins and the second long-distance hairpins are alternately arranged in the third layer and the fourth layer in sequence; and The first short-distance hairpins and the first long-distance hairpins are alternately arranged in the fifth layer and the sixth layer.

7. The motor stator according to claim 6, characterized in that: The pitch between any two connected U-shaped hairpins is Y or Y-1.

8. The motor stator according to claim 7, characterized in that: The effective edges of the U-shaped hairpin located in the first layer, the second layer and the third layer are twisted by 6 slots when connected with the effective edge of another U-shaped hairpin; The effective edges of the U-shaped hairpin located in the fourth layer and the sixth layer are tilted by 5 slots when connected with the effective edge of another U-shaped hairpin; and The effective edge of the U-shaped hairpin located in the fifth layer is twisted obliquely by 7 slots when connected with the effective edge of another U-shaped hairpin.

9. The motor stator according to claim 8, characterized in that: Each phase stator winding includes a plurality of hairpin groups connected in sequence, each of the hairpin groups includes four U-shaped hairpins connected in parallel so that each phase stator winding includes four branches connected in parallel, the four branches include a first sub-winding wound from the first layer to the sixth layer, and a second sub-winding wound from the sixth layer to the first layer, When the four adjacent core slots occupied by the four effective sides of each card issuing group located on the same layer are defined as q1, q2, q3 and q4: The first branch of the four branches has a portion corresponding to the first sub-winding occupying q1 and q3, and a portion corresponding to the second sub-winding occupying q2 and q4; The part of the second branch of the four branches corresponding to the first sub-winding occupies q2 and q4, and the part corresponding to the second sub-winding occupies q1 and q3; The portion of the third branch of the four branches corresponding to the first sub-winding occupies q3 and q1, and the portion corresponding to the second sub-winding occupies q4 and q2; as well as The portion of the fourth branch of the four branches corresponding to the first sub-winding occupies q4 and q2, and the portion corresponding to the second sub-winding occupies q3 and q1.

10. The motor stator according to claim 1, characterized in that: The first ends of the two effective sides of the U-shaped hairpin are connected to each other to form a formed end, and the second end is twisted obliquely to be constructed as a welding end connected to another U-shaped hairpin, wherein the formed ends of the first long-distance hairpin and the second long-distance hairpin are constructed to be flat.

11. The motor stator according to claim 1, characterized in that: It comprises a three-phase stator winding, the number of the core slots is 72, and the number of slots per pole and per phase of the motor stator is 4.

12. A motor, characterized in that: The invention comprises the motor stator according to any one of claims 1 to 11.

13. A vehicle, characterized in that: Including the motor as claimed in claim 12.

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