Stator assembly, motor and vehicle

Abstract

The present invention provides a stator assembly, a motor and a vehicle. The stator assembly includes a stator core and a stator winding. The stator core is provided with z stator slots. Each stator slot is provided with L slot layers. L is an odd number greater than 3. The stator winding includes m-phase stator windings. m is a multiple of 3. Each phase stator winding includes a plurality of U-shaped conductors. Each U-shaped conductor includes a connecting portion, two slot portions and two bent portions, the two slot portions are respectively connected to the two ends of the connecting portion, and the two bent portions are respectively connected to the ends of the two slot portions facing away from the connecting portion. The pitch between the two slot portions is y stator slots. Each slot layer is provided with an slot portion, and the slot portions in each stator slot belong to the same phase stator winding. In the stator assembly provided by the present invention, by setting the number of slot layers in the stator slot to an odd number of layers, when the designer changes the size of the motor, the number of layers of conductors in the stator slot can be increased or decreased by one layer.

Description

Technical Field

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

[0002] With the development of new energy electric vehicles, the requirements for electric vehicle range are becoming increasingly higher, and the requirements for drive motors are also becoming increasingly higher. Compared with motors with round wire stator windings, motors with flat wire stator windings have higher slot fill factors, higher power density, better heat dissipation capabilities, and lower weight. Therefore, motors with flat wire stator windings are widely used in new energy electric vehicles.

[0003] However, the number of layers of flat wire conductors in each stator slot of the existing flat wire stator winding motor is an even number. When the designer needs to change the size of the motor, the number of layers of flat wire conductors in the stator slot needs to be increased or decreased by two layers. The number of layers of flat wire conductors in the stator slot varies greatly, which is not conducive to the designer's modification of the motor size. Summary of the Invention

[0004] Embodiments of the present invention provide a stator assembly, a motor, and a vehicle to solve the problem of large variations in the number of conductor layers in stator slots.

[0005] In a first aspect, the present invention provides a stator assembly, comprising:

[0006] a stator core, wherein the stator core is provided with z stator slots, the z stator slots being arranged at intervals along the circumferential direction of the stator core, and each stator slot is provided with L slot layers arranged along the radial direction of the stator core, wherein z is an integer greater than or equal to 6, and L is an odd number greater than 3;

[0007] A stator winding, comprising m-phase stator windings, wherein m is a multiple of 3; each phase of the stator winding comprises a plurality of U-shaped conductors, the U-shaped conductors being configured as flat wire conductors, each of the U-shaped conductors comprising a connecting portion, two in-slot portions, and two bent portions; the two in-slot portions comprising a first in-slot portion and a second in-slot portion, the two bent portions comprising a first bent portion and a second bent portion; the first in-slot portion and the second in-slot portion are respectively connected to two ends of the connecting portion, the first bent portion being connected to an end of the first in-slot portion facing away from the connecting portion, and the second bent portion being connected to an end of the second in-slot portion facing away from the connecting portion; the first in-slot portion and the second in-slot portion of each U-shaped conductor are respectively disposed in two different stator slots, and the pitch between the first in-slot portion and the second in-slot portion is y stator slots;

[0008] Each slot layer is provided with an in-slot portion, and the in-slot portion in each stator slot belongs to the stator winding of the same phase;

[0009] The plurality of U-shaped conductors include a plurality of first conductors, a plurality of second conductors and a plurality of third conductors;

[0010] The first slot portion of each first conductor passes through the first slot layer of one of the stator slots, and the second slot portion passes through the second slot layer of another stator slot; the first bent portion of one of the first conductors in each phase of the stator winding is configured as an incoming wire end, and the second bent portion is bent along a first direction, and the first bent portions and second bent portions of the remaining first conductors are all bent in the first direction; wherein the first direction is along the circumferential direction of the stator core;

[0011] The plurality of second conductors include a plurality of first sub-conductors and N types of second sub-conductors, wherein the first in-slot portion of each first sub-conductor passes through the first slot layer of one of the stator slots, and the second in-slot portion passes through the second slot layer of another stator slot; the first bent portion of the first sub-conductor adjacent to the incoming end in the first direction in each phase of the stator winding is configured as an outgoing end, and the second bent portion is bent along the first direction; the first bent portions of the remaining first sub-conductors are bent in a second direction, and the second bent portions are bent in the first direction; wherein the second direction is along the circumferential direction of the stator core and is opposite to the first direction;

[0012] The first in-slot portion of the second sub-conductor passes through the k+2th slot layer of one of the stator slots, and the second in-slot portion passes through the k+3th slot layer of another stator slot, and the first in-slot portions of different types of second sub-conductors are located in different slot layers and the second in-slot portions are located in different slot layers, wherein N=(L-3) / 2, k is greater than or equal to 1 and less than L-3; the first bent portion of the second sub-conductor is bent in the second direction, and the second bent portion is bent in the first direction;

[0013] The first in-slot portion of each of the third conductors passes through the Lth slot layer of one of the stator slots, and the second in-slot portion passes through the Lth slot layer of another stator slot; the first bent portion and the second bent portion of each of the third conductors are bent toward the second direction;

[0014] Each phase of the stator winding is formed by a plurality of conductor units connected in series, each of which includes one first conductor, one first sub-conductor, 2N second sub-conductors, and one third conductor; wherein the 2N second sub-conductors are connected to form two conductor chains, and each conductor chain is formed by N types of second sub-conductors connected in series, with the second bend of each type of second sub-conductor connected to the first bend of another type of second sub-conductor;

[0015] In each of the conductor units, the second bend portion of the first conductor is connected to the second bend portion of the third conductor through one of the conductor chains, the first bend portion of the third conductor is connected to the second bend portion of the first sub-conductor through another conductor chain, and the first bend portion of the first sub-conductor is connected to the first bend portion of the first conductor in another conductor unit.

[0016] In a second aspect, the present invention provides a motor comprising the above-mentioned stator assembly.

[0017] In a third aspect, the present invention provides a vehicle comprising the above-mentioned motor.

[0018] The stator assembly provided by the present invention solves the problem of large variations in the number of conductor layers within the stator slots by setting the number of slot layers to an odd number. When designers modify the motor's dimensions, the number of conductor layers within the stator slots can be increased or decreased by one layer, minimizing the variation in the number of conductor layers within the stator slots and facilitating motor size adjustments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a structural schematic diagram of a stator assembly provided by an embodiment of the present invention.

[0021] Figure 2 yes Figure 1 Schematic diagram of the structure of the stator slots in the stator assembly.

[0022] Figure 3 yes Figure 1 Schematic diagram of the positional relationship between the first conductor and the stator core in the stator assembly.

[0023] Figure 4 yes Figure 1Schematic diagram of the positional relationship between the third conductor and the stator core in the stator assembly.

[0024] Figure 5 yes Figure 1 Schematic diagram of the positional relationship between the first sub-conductor and the stator core in the stator assembly.

[0025] Figure 6 yes Figure 1 Schematic diagram of the positional relationship between the first and second sub-conductors and the stator core in the stator assembly.

[0026] Figure 7 yes Figure 1 Schematic diagram of the positional relationship between the second type of second sub-conductor and the stator core in the stator assembly.

[0027] Figure 8 Schematic diagram of the distribution of the B-phase stator winding in each slot layer in each stator slot provided by the first embodiment of the present invention.

[0028] Figure 9 Schematic diagram of the distribution of the B-phase stator winding in each slot layer in each stator slot provided by the second embodiment of the present invention.

[0029] Figure 10 It is a structural diagram of the B-phase stator winding provided in the second embodiment of the present invention.

[0030] Figure 11 Schematic diagram of the winding of the stator windings of each phase provided in the second embodiment of the present invention.

[0031] Description of main component symbols

[0032] stator assembly 1 stator core 10 Yoke 11 Tooth 12 stator slots 110 slot layer 111 stator winding 20 U-shaped conductor 200 Connection 210 Inner part of the tank 220 Inner part of the first groove 221 The second groove part 222 Bending section 230 First bending part 231 Second bending part 232 Welding Department 240 First conductor 201 Second conductor 202 First sub-conductor 202a The first second sub-conductor 202b The second sub-conductor 202c The third conductor 203 Incoming line 21a, 21b, 21c, 21u, 21v, 21w, Outlet 22a, 22b, 22c, 22u, 22v, 22w, First direction D1 Second direction D2 Part 1 301 Part 2 302 First welding area 303 Second welding area 304

[0033] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] References herein to "embodiments" or "implementations" mean that a particular feature, structure, or characteristic described in connection with the embodiment or implementation may be included in at least one embodiment of the present invention. The appearance of such phrases in various places in the specification does not necessarily refer to the same embodiment, nor do they constitute independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] It should be noted that the purpose of providing the following specific embodiments of the present invention is to facilitate a clearer and more thorough understanding of the disclosed contents of the present invention, wherein words indicating directions such as up, down, left, and right only refer to the positions of the structures shown in the corresponding drawings.

[0037] See also Figure 1 and Figure 2 , Figure 1 It is a structural schematic diagram of the stator assembly 1 provided in an embodiment of the present invention. The stator assembly 1 is suitable for use in a motor with a flat wire stator winding. The stator assembly 1 includes a stator core 10 and a stator winding 20. The stator core 10 is cylindrical in structure. Z stator slots 110 are provided on the stator core 10 along the axial direction, and the z stator slots 110 are arranged at intervals along the circumferential direction of the stator core 10. Wherein, z is an integer greater than or equal to 6. The stator slot 110 passes through the stator core 10 in the axial direction. L slot layers are provided in each stator slot 110, and the L slot layers are arranged in sequence along the radial direction of the stator core 10. Wherein, L is an odd number greater than 1, and the value of L can be 3, 5, 7, etc. In the present invention, by setting the number of slot layers in the stator slot 110 to an odd number, designers can increase or decrease the number of single-layer conductors when modifying the structural dimensions of the motor, making the structural adjustment of the motor more flexible and convenient, and also making it easy to adjust the torque and power of the motor.

[0038] The stator winding 20 includes an m-phase stator winding, and each phase stator winding 20 includes a plurality of U-shaped conductors 200. The plurality of U-shaped conductors 200 are connected in sequence to form a continuous conductor. The cross-sectional shape of the U-shaped conductor 200 perpendicular to its extension direction is non-circular. Preferably, the cross-sectional shape is configured as a rectangle, and the area of ​​the cross section is equal in the extension direction of the U-shaped conductor 200. The U-shaped conductor 200 is configured as a flat wire conductor. Each U-shaped conductor 200 includes a connecting portion 210, two slot portions 220 and two bent portions 230. The two slot portions 220 include a first slot portion 221 and a second slot portion 222. The two bent portions 230 include a first bent portion 231 and a second bent portion 232. The first slot portion 221 and the second slot portion 222 are respectively connected to both ends of the connecting portion 210. The first bend 231 is connected to the end of the first in-slot portion 221 facing away from the connection portion 210, and the second bend 232 is connected to the end of the second in-slot portion 222 facing away from the connection portion 210. The two in-slot portions 220 of each U-shaped conductor 200 are disposed in two different stator slots 110 on the stator core 10. The pitch between the two in-slot portions 220 on the same U-shaped conductor 200 is y stator slots 110. Each slot layer of each stator slot 110 is provided with one in-slot portion 220, and the in-slot portions 220 in each stator slot 110 belong to the same phase of the stator winding 20.

[0039] It should be noted that the technical term "pitch" used in the embodiments and claims herein is also referred to as span. Each stator slot 110 is numbered sequentially, and the absolute value of the difference between the number values ​​of the stator slots 110 in which the two in-slot portions 220 of each U-shaped conductor 200 are located is the pitch of the U-shaped conductor 200. In other words, if one in-slot portion 220 of a U-shaped conductor 200 is located in a stator slot 110 with a smaller number, and the other in-slot portion 220 is located in a stator slot 110 with a larger number, then the difference obtained by subtracting the number value of the smaller stator slot 110 from the number value of the larger stator slot 110 is the pitch referred to herein. The starting end of the numbering of the stator slots 110 is located outside the U-shaped conductor 200. That is, the stator slots 110 in which the two slot portions 220 of the U-shaped conductor 200 are located and the stator slots 110 located between the two slot portions 220 are numbered in ascending or descending order. Otherwise, the pitch of the U-shaped conductor 200 is the difference between the maximum number of the stator slots 110 and the absolute value. For example, if one slot portion 220 of the U-shaped conductor 200 is disposed in the first stator slot 110 and the other slot portion 220 is disposed in the seventh stator slot 110, and the absolute value of the result of the subtraction of the number of the seventh stator slot 110 (7) and the number of the first stator slot 110 (1) is equal to 6, then the pitch between the two slot portions 220 of the U-shaped conductor 200 is 6 stator slots 110. For another example, when the number of stator slots 110 is 48, one of the slot portions 220 of the U-shaped conductor 200 is arranged in the 45th stator slot 110, and the other slot portion 220 is arranged in the third stator slot 110, the absolute value of the result of subtracting the number value 3 of the third stator slot 110 from the number value 45 of the 45th stator slot 110 is equal to 42, and the maximum number value 48 of the stator slot 110 minus the absolute value 42 is equal to 6. Then, the pitch between the two slot portions 220 of the U-shaped conductor 200 is 6 stator slots 110.

[0040] In this embodiment, the stator assembly 1 includes a first direction D1 and a second direction D2 along the circumferential direction of the stator core 10, and the first direction D1 and the second direction D2 are in opposite directions. Figure 1 In the illustrated perspective, the first direction D1 is clockwise, and the second direction D2 is counterclockwise. In this embodiment, the pitch of each U-shaped conductor 200 is y, meaning that different U-shaped conductors 200 have the same pitch. This significantly reduces the number of U-shaped conductors 200 included in the stator winding 20, thereby reducing the production process and manufacturing costs of the stator assembly 1. Furthermore, the uniform pitch of each U-shaped conductor 200 y improves the consistency between different conductors, thereby ensuring consistent internal resistance within each phase of the stator winding 20 and preventing branch currents from circulating between different phases of the stator winding 20.

[0041] In this embodiment, the bent portion 230 is bent relative to the in-slot portion 220 to secure the U-shaped conductor 200 relative to the stator slot 110 and prevent the in-slot portion 220 of the U-shaped conductor 200 from slipping out of the stator slot 110. The bent portion 230 is bent along the circumferential direction of the stator core 10. Preferably, the bent portion 230 is bent by y / 2 stator slots 110 along the circumferential direction. That is, in one in-slot portion 220 of the stator winding 20 and the corresponding bent portion 230 connected thereto, the distance between the end of the bent portion 230 facing away from the in-slot portion 220 and the in-slot portion 220 is y / 2 stator slots 110. For example, when the pitch y is equal to 6 and the in-slot portion 220 is located in the fourth stator slot 110 , the end of the bent portion 230 corresponding to the in-slot portion 220 facing away from the in-slot portion 220 is located in the first stator slot 110 or the seventh stator slot 110 .

[0042] The stator assembly 1 provided in this embodiment is suitable for use in a motor with z slots, 2 p poles, and m phases. Here, z represents the number of stator slots 110 provided on the motor. p represents the number of magnetic pole pairs of the motor. Each pair of magnetic poles includes an N pole and an S pole. The number of magnetic pole pairs p can be 1, 2, 3, 4, etc. m represents the number of phases of the motor. In an m-phase motor, the stator assembly 1 of the motor includes m-phase stator windings 20. In this embodiment, m is a multiple of 3. For example, when m is 3, the motor is a three-phase motor; when m is 6, the motor is a six-phase motor. The number of stator slots 110 on the stator core 10 can be calculated according to the formula z=2pqm. Here, q represents the number of slots per phase per pole of the motor, that is, the number of stator slots 110 wound by the stator winding 20 per phase in each magnetic pole of the motor. The pitch y between the two in-slot portions 220 of each U-shaped conductor 200 can be calculated according to the formula y=z / (2p).

[0043] In this embodiment, the L slot layers in the stator slots 110 are arranged along the radial direction of the stator core 10. The L slot layers include a first slot layer, a second slot layer, ..., and an Lth slot layer. The first slot layer in the stator slots 110 is located at the slot bottom of the stator slots 110, that is, the first slot layer is the slot layer farthest from the central axis of the stator core 10 among the L slot layers in the stator slots 110. The Lth slot layer in the stator slots 110 is located at the slot opening of the stator slots 110, that is, the Lth slot layer is the slot layer closest to the central axis of the stator core 10 among the stator slots 110. In some embodiments, the first slot layer is located at the slot opening of the stator slots 110, and the Lth slot layer is located at the slot bottom of the stator slots 110.

[0044] See also Figures 3 to 7 , the plurality of U-shaped conductors 200 include a plurality of first conductors 201, a plurality of second conductors 202 and a plurality of third conductors 203. Figures 3 to 7In the figure, the numbers of the stator slots 110 where the first in-slot portions 221 and the second in-slot portions 222 of the first conductor 201, the second conductor 202, and the third conductor 203 are located are merely exemplary numbers for the convenience of description, and are not the numbers of the stator slots 110 where the first in-slot portions 221 and the second in-slot portions 222 of the first conductor 201, the second conductor 202, and the third conductor 203 are actually located. Figures 3 to 7 In the embodiment, the first conductor 201 , the second conductor 202 , and the third conductor 203 are described by taking the number of slot layers L=7 of the stator slot 110 as an example.

[0045] The first in-slot portion 221 of each first conductor 201 passes through the first slot layer of one stator slot 110, and the second in-slot portion 222 passes through the second slot layer of another stator slot 110. The first bend portion 231 of one of the first conductors 201 in each phase of the stator winding 20 serves as the incoming conductor, and the second bend portion 232 bends along the first direction D1. The first bend portions 231 and second bend portions 232 of the remaining first conductors 201 also bend along the first direction D1. For example, the first in-slot portion 221 of the first conductor 201 passes through the first slot layer of the first stator slot 110, the second in-slot portion 222 passes through the second slot layer of the seventh stator slot 110, the first bend portion 231 bends along the first direction D1 to the first slot layer of the fourth stator slot 110, and the second bend portion 232 bends along the first direction D1 to the second slot layer of the tenth stator slot 110.

[0046] The first in-slot portion 221 of each third conductor 203 passes through the Lth slot layer, i.e., the seventh slot layer, of one of the stator slots 110; the second in-slot portion 222 passes through the Lth slot layer, i.e., the seventh slot layer, of another stator slot 110. The two bent portions 230 of each third conductor 203 bend in the same direction. Both the first bent portion 231 and the second bent portion 232 of each third conductor 203 bend along the second direction D2. For example, the first in-slot portion 221 of the third conductor 203 passes through the seventh slot layer of the seventh stator slot 110, and the second in-slot portion 222 passes through the seventh slot layer of the fourth stator slot 110. The first bent portion 231 bends along the second direction D2 to the seventh slot layer of the fourth stator slot 110, and the second bent portion 232 bends along the second direction D2 to the seventh slot layer of the tenth stator slot 110.

[0047] The first in-slot portion 221 of each second conductor 202 passes through the i-th slot layer of one stator slot 110, and the second in-slot portion 222 passes through the i+1-th slot layer of another stator slot 110. Here, i is greater than or equal to 1 and less than L-1.

[0048] When L is 3, the second conductor 202 includes a first sub-conductor 202a. The first in-slot portion 221 of the first sub-conductor 202a passes through the first slot layer of one of the stator slots 110, and the second in-slot portion 222 passes through the second slot layer of another stator slot 110. For example, the first in-slot portion 221 of the first sub-conductor 202a passes through the first slot layer of the seventh stator slot 110, and the second in-slot portion 222 passes through the second slot layer of the thirteenth stator slot 110. The first bent portion 231 bends along the second direction D2 to the fourth stator slot 110, and the second bent portion 232 bends along the first direction D1 to the second slot layer of the sixteenth stator slot 110. Among them, the first bending portion 231 of one of the first sub-conductors 202a in each phase stator winding 20 is configured as an outlet end, and the second bending portion 232 is bent along the first direction D1; the first bending portion 231 of the remaining first sub-conductors 202a is bent along the second direction D2, and the second bending portion 232 is bent along the first direction D1.

[0049] When L is greater than 3, the multiple second conductors 202 include multiple first sub-conductors 202a and N types of second sub-conductors. Wherein, N=(L-3) / 2. The first in-slot portion 221 of the second sub-conductor passes through the k+2th slot layer of one of the stator slots 110, and the second in-slot portion 222 passes through the k+3th slot layer of another stator slot 110, and the first in-slot portions 221 and the second in-slot portions 222 of different types of second sub-conductors are located in different slot layers. Wherein, k is greater than or equal to 1 and less than L-3. The first bending portion 231 of the second sub-conductor is bent along the second direction D2, and the second bending portion 232 is bent along the first direction D1. For example, when the number of slot layers L in the stator slot 110 is 7, N=(7-3) / 2=2, and the second conductor 202 includes the first type of second sub-conductor 202b and the second type of second sub-conductor 202c. As Figure 6 As shown, the first in-slot portion 221 of the first type second sub-conductor 202b passes through the third slot layer of the seventh stator slot 110, the second in-slot portion 222 passes through the fourth slot layer of the thirteenth stator slot 110, the first bent portion 231 bends along the second direction D2 to the third slot layer of the fourth stator slot 110, and the second bent portion 232 bends along the first direction D1 to the fourth slot layer of the sixteenth stator slot 110. Figure 7 As shown, the first in-slot portion 221 of the second type second sub-conductor 202c passes through the fifth slot layer of the seventh stator slot 110, the second in-slot portion 222 passes through the sixth slot layer of the thirteenth stator slot 110, the first bent portion 231 is bent along the second direction D2 to the fifth slot layer of the fourth stator slot 110, and the second bent portion 232 is bent along the first direction D1 to the sixth slot layer of the sixteenth stator slot 110.

[0050] Each phase of the stator winding 20 is formed by a plurality of conductor units connected in series, each of which includes a first conductor 201, at least one second conductor 202, and a third conductor 203. The number of conductor units in each phase of the stator winding 20 can be z / (2y). When L is 3, in each conductor unit, the second bend 232 of the first conductor 201 is connected to the second bend 232 of the third conductor 203, and the first bend 231 of the third conductor 203 is connected to the first bend 231 of the first conductor 201 in another conductor unit through the second conductor 202. Specifically, in each conductor unit, the second bend 232 of the first conductor 201 is connected to the second bend 232 of the third conductor 203, the first bend 231 of the third conductor 203 is connected to the second bend 232 of the first sub-conductor 202a, and the first bend 231 of the first sub-conductor 202a is connected to the first bend 231 of the first conductor 201 in another conductor unit.

[0051] When L is greater than 3, in each conductor unit, the second bend 232 of the first conductor 201 is connected to the second bend 232 of the third conductor 203 via the second conductor 202, and the first bend 231 of the third conductor 203 is connected to the first bend 231 of the first conductor 201 in another conductor unit via the second conductor 202. When L is greater than 3, the at least one second conductor 202 includes one first sub-conductor 202a and 2N second sub-conductors. The 2N second sub-conductors are connected to form two conductor chains. Each conductor chain is formed by connecting N second sub-conductors in series. The second bend 232 of each second sub-conductor is connected to the first bend 231 of another second sub-conductor. For example, when L = 7, the second bend 232 of the first second sub-conductor 202b is connected to the first bend 231 of the second second sub-conductor 202c to form a conductor chain in series. Each conductor unit includes two conductor chains. Specifically, in each of the conductor units, the second bending portion 232 of the first conductor 201 is connected to the second bending portion 232 of the third conductor 203 through one of the conductor chains, the first bending portion 231 of the third conductor 203 is connected to the second bending portion 232 of the first sub-conductor 202a through another of the conductor chains, and the first bending portion 231 of the first sub-conductor 202a is connected to the first bending portion 231 of the first conductor 201 in another of the conductor units.

[0052] Each phase of the stator winding 20 includes an inlet and an outlet. The inlet and outlet of the same phase of the stator winding 20 differ by y stator slots 110. For example, when the pitch of the U-shaped conductor 200 is 6, the inlet of one of the m-phase stator windings 20 can be located in the first stator slot 110, and the outlet can be located in the seventh stator slot 110. In this embodiment, the inlet and outlet of each phase of the stator winding 20 are both located in the first slot layer of the stator slots 110. Specifically, the first bend 231 of one of the first conductors 201 in each phase of the stator winding 20 is configured as the inlet, and the first bend 231 of the second conductor 202 adjacent to the inlet in the first direction D1 is configured as the outlet.

[0053] In this embodiment, in each phase of the stator winding 20, the incoming wire end is bent a distance away from the central axis of the stator core 10, then bent in a direction away from the connection portion 210 and parallel to the central axis of the stator core 10. The outgoing wire end is bent a distance away from the central axis of the stator core 10, then bent in a direction away from the connection portion 210 and parallel to the central axis of the stator core 10. The bending distance of the incoming wire end and the outgoing wire end in the direction away from the central axis of the stator core 10 can be specifically set according to the specific configuration of the stator core 10 and is not specifically limited in this application. For example, the distance can be the distance of one slot layer. In some embodiments, in each phase of the stator winding 20, the incoming wire end is bent a distance away from the central axis of the stator core 10, then bent in a direction away from the connection portion 210 and parallel to the central axis of the stator core 10. The outgoing wire end can be bent in the second direction D2 or other directions. In some embodiments, in each phase of the stator winding 20, the outgoing wire end is bent for a distance in a direction away from the central axis of the stator core 10, and then bent in a direction away from the connection portion 210 and parallel to the central axis of the stator core 10. The incoming wire end can be bent in the first direction D1 or other directions. In some embodiments, in each phase of the stator winding 20, the incoming wire end can be bent in the first direction D1, and the outgoing wire end can be bent in a direction other than the second direction D2. In some embodiments, in each phase of the stator winding 20, the outgoing wire end can be bent in the second direction D2, and the incoming wire end can be bent in a direction other than the first direction D1.

[0054] Please refer again Figure 1 and Figure 2The stator core 10 includes a yoke 11 and a plurality of teeth 12, the root of each tooth 12 is connected to the yoke 11, and the top of each tooth 12 is away from the yoke 11. The yoke 11 is cylindrical, and the plurality of teeth 12 are arranged on the inner surface of the yoke 11 at intervals along the circumferential direction of the yoke 11. A stator slot 110 is formed between two adjacent teeth 12. The first slot layer of the stator slot 110 is close to the yoke 11. In this embodiment, by arranging the input and output ends of the stator winding 20 in the first slot layer of the stator slot 110, the input and output ends can be connected to other components along the radial direction of the stator core 10, thereby making the axial size of the stator assembly 1 more compact. Preferably, the input and output ends of the stator winding 20 are bent a distance away from the central axis of the stator core 10 so that the input and output ends are located on the end surface of the yoke 11, thereby facilitating the connection of the input and output ends with other components.

[0055] It is understood that after the input and output ends of a phase stator winding 20 are connected together, the phase stator winding 20 will form a closed loop structure. At this time, if the phase stator winding 20 is disconnected at an appropriate location in the phase stator winding 20, the phase stator winding 20 will form an input and output end at the disconnected location. Therefore, the input and output ends of each phase stator winding 20 can both be located in the Lth slot layer of the stator slot 110; alternatively, one of the input and output ends of each phase stator winding 20 can be located in one slot layer of one stator slot 110, and the other can be located in the adjacent slot layer of another stator slot 110.

[0056] See also Figure 1 and Figure 10 In each U-shaped conductor 200, the end of each bent portion 230 away from the slot portion 220 is a welding portion 240. The end of the stator winding 20 where the welding portion 240 is located is the welding end I of the stator assembly 1, and the end where the connecting portion 210 is located is the hairpin end II of the stator assembly 1. Each phase stator winding 20 includes a first part 301 and a second part 302 distributed along the circumferential direction of the stator core 10. The area of ​​the first part 301 is smaller than the area of ​​the second part 302. The first part 301 and the second part 302 are arranged in a fan shape. The areas of the first part 301 and the second part 302 can be expressed by the number of stator slots 110. The number of stator slots 110 corresponding to the first part 301 in the stator winding 20 is smaller than the number of stator slots 110 corresponding to the second part 302. For example, in Figure 10 In the first part 301, Figure 10The area included at the acute angle formed by the two dashed lines in . Specifically, the first portion 301 covers the stator slots 110 spanning between the incoming and outgoing terminals of the stator winding 20, and the second portion 302 covers the remaining stator slots 110 after removing the stator slots 110 included in the first portion 301. For example, if the number of stator slots 110 z = 48, the pitch y of the U-shaped conductor 200 = 6, the stator slot 110 where the incoming terminal of the stator winding 20 is located is the first stator slot 110, and the stator slot 110 where the outgoing terminal is located is the seventh stator slot 110, the first portion 301 covers the first to seventh stator slots 110, and the second portion 302 covers the eighth to forty-eighth stator slots 110.

[0057] Within the first portion 301, the stator winding 20 has a first welding area 303, which includes L-1 welds 240. Within the second portion 302, the stator winding 20 has a plurality of first welding areas 303 and a plurality of second welding areas 304, arranged alternately. Each first welding area 303 includes L-1 welds 240, and each second welding area 304 includes L+1 welds 240. The L-1 welds 240 within the first welding area 303 are welded in pairs along the radial outward direction of the stator core 10, while the L+1 welds 240 within the second welding area 304 are welded in pairs along the radial outward direction of the stator core 10. For example, the weld 240 closest to the central axis of the stator core 10 is welded to the weld 240 closest to the central axis of the stator core 10. Each two welded portions 240 welded together form a weld spot. Therefore, the first weld zone 303 has an odd number of weld spots, and the second weld zone 304 has an even number of weld spots. For example, when the number of slot layers L in the stator slot 110 is 7, the first weld zone 303 has six welded portions 240, which form three weld spots. The second weld zone 304 has eight welded portions 240, which form four weld spots.

[0058] Specifically, taking one of the m-phase stator windings 20 as an example, the connection relationship between the U-shaped conductors 200 in this phase of the stator winding 20 is described. The X-th stator slot 110 on the stator core 10 is the incoming line end of this phase of the stator winding 20. Here, X is an integer greater than 0 and less than or equal to z.

[0059] The slot portion 220 corresponding to the 2x+1 slot layer in the X+(2n+1)y-th stator slot 110 is connected to the slot portion 220 corresponding to the 2x slot layer in the X+2ny-th stator slot 110. The slot portion 220 corresponding to the 2x slot layer in the X+(2n+1)y-th stator slot 110 is connected to the slot portion 220 corresponding to the 2x+1 slot layer in the X+(2n+2)y-th stator slot 110. The slot portion 220 corresponding to the first slot layer in the X+2ny-th stator slot 110 is connected to the slot portion 220 corresponding to the first slot layer in the X+(2n+1)y-th stator slot 110.

[0060] Where n is an integer greater than or equal to 1 and less than z / (2y), and x is an integer greater than or equal to 1 and less than or equal to (L-1) / 2. Since the z stator slots 110 are arranged circumferentially on the stator core 10, when X+(2n+2)y is greater than z, the value of X+(2n+2)y is actually expressed as X+(2n+2)yz. For example, when X=1, n=3, y=6, and z=48, X+(2n+2)y=1+(2×3+2)×6=49, and the 49th stator slot 110 is actually the first stator slot 110.

[0061] Because the stator winding 20 has an inlet and an outlet, two slot portions 220 on the stator winding 20 are not connected to the other slot portions 220. In this embodiment, the slot portion 220 corresponding to the first slot layer in the Xth stator slot 110 serves as the inlet of the stator winding 20; the slot portion 220 corresponding to the first slot layer in the X+yth stator slot 110 serves as the outlet of the stator winding 20. Specifically, in the stator winding 20, the slot portion 220 corresponding to the 2xth slot layer in the Xth stator slot 110 is connected to the slot portion 220 corresponding to the 2x+1th slot layer in the X+yth stator slot 110, and the slot portion 220 corresponding to the 2x+1th slot layer in the Xth stator slot 110 is connected to the slot portion 220 corresponding to the 2xth slot layer in the X+zyth stator slot 110. The slot portion 220 corresponding to the 2xth slot layer in the X+yth stator slot 110 is connected to the slot portion 220 corresponding to the 2x+1th slot layer in the X+2yth stator slot 110 .

[0062] See also Figure 10Since the number of slot layers in the stator slot 110 is an odd number, and the number of slot portions 220 corresponding to each stator slot 110 is also an odd number, when welding the welded portions 240, the welded portions 240 corresponding to the slot portions 220 in the first slot layer of each stator slot 110 will not be welded to the welded portions 240 corresponding to the slot portions 220 in the second slot layer. In this embodiment, the bent portions 230 corresponding to the slot portions 220 in the first slot layer of the stator slot 110 are bent toward each other, thereby allowing the two welded portions 240 corresponding to the slot portions 220 in the first slot layer of two different stator slots 110 to be welded. Specifically, the first bent portion 231 of the first conductor 201 is bent toward the first direction D1, and the first bent portion 231 of the first sub-conductor 202a is bent toward the second direction D2, and the first bent portion 231 of the first sub-conductor 202a is bent away from the central axis of the stator core 10 by a distance of one slot layer to avoid the first bent portion 231 of the first conductor 201. For example, Figure 5 As shown, the first bent portion 231 of the first sub-conductor 202a is bent away from the central axis of the stator core 10 by a distance of one slot layer. In each phase of the stator winding 20, excluding the first conductor 201 and first sub-conductor 202a at the input and output terminals, the remaining first conductors 201 and the first bent portion 231 of the first sub-conductor 202a are connected together. In some embodiments, the first bent portion 231 of the first sub-conductor 202a is bent in the second direction D2, and the first bent portion 231 of the first conductor 201 is bent in the first direction D1. The first bent portion 231 of the first conductor 201 is bent away from the central axis of the stator core 10 by a distance of one slot layer to avoid the first bent portion 231 of the first sub-conductor 202a.

[0063] The following describes in detail the winding method of each phase stator winding 20 in the stator assembly 1 by taking different embodiments as examples.

[0064] Example 1:

[0065] In the first embodiment of the present invention, the number of slots per pole per phase of the motor is configured to be 1, that is, q=1. The number of magnetic pole pairs of the motor is configured to be 4 pairs, that is, p=4. The motor is configured as a six-phase motor, that is, m=6. The number of stator slots 110 on the stator core 10 is: z=2pqm=2×4×1×6=48. The pitch between the two in-slot portions 220 of each U-shaped conductor 200 is: y=z / (2p)=48 / (2×4)=6, that is, there are 6 stator slots 110 between the two in-slot portions 220 of each U-shaped conductor 200. The number of slot layers in the stator slot 110 is configured to be three layers, that is, L=3. Each stator slot 110 accommodates three in-slot portions 220, and the three in-slot portions 220 all belong to the same phase stator winding 20.

[0066] In the first embodiment, the motor is configured as a six-phase motor, including six-phase stator windings 20. The six-phase stator windings 20 include a first set of stator windings and a second set of stator windings. The first set of stator windings includes an A-phase stator winding 20, a B-phase stator winding 20, and a C-phase stator winding 20, and the second set of stator windings includes a U-phase stator winding 20, a V-phase stator winding 20, and a W-phase stator winding 20. Optionally, a phase angle of 30° or 60° is created between the first and second sets of stator windings to offset harmonics generated between stator windings 20 of different phases during operation of the stator assembly 1. The stator slots 110 in which the stator windings 20 of each phase in the six-phase stator winding 20 are located are different, but the structures of the stator windings 20 of each phase are similar. This can make the branch currents in each phase stator winding 20 consistent, avoiding the occurrence of branch circulation currents between the stator windings 20 of each phase, thereby reducing the copper loss of the stator assembly 1 and improving the service life of the motor.

[0067] See also Figure 1 The A-phase stator winding 20 includes an incoming line terminal 21a and an outgoing line terminal 22a; the B-phase stator winding 20 includes an incoming line terminal 21b and an outgoing line terminal 22b; the C-phase stator winding 20 includes an incoming line terminal 21c and an outgoing line terminal 22c; the U-phase stator winding 20 includes an incoming line terminal 21u and an outgoing line terminal 22a; the V-phase stator winding 20 includes an incoming line terminal 21v and an outgoing line terminal 22v; and the W-phase stator winding 20 includes an incoming line terminal 21w and an outgoing line terminal 22w.

[0068] The incoming wire ends of the A-phase stator winding 20, the B-phase stator winding 20, and the C-phase stator winding 20 are spaced apart by y / 2+1 stator slots 110 in the circumferential direction of the stator core 10. The incoming wire ends of the U-phase stator winding 20, the V-phase stator winding 20, and the W-phase stator winding 20 are spaced apart by y / 2+1 stator slots 110 in the circumferential direction of the stator core 10. The difference of y / 2+1 stator slots 110 means that the absolute value of the difference between the stator slot 110 numbers of the incoming wire ends of the two-phase stator windings 20 is y / 2+1. Among them, the stator slots 110 where the incoming end of the two-phase stator winding 20 is located and the stator slots 110 between the incoming end of the two-phase stator winding 20 are sequentially increasing or decreasing, otherwise the absolute value of the difference between the maximum number value of the stator slot 110 and the number value of the stator slot 110 where the incoming end of the two-phase stator winding 20 is located is y / 2+1. For example, if the number of stator slots 110 is 48, the pitch y of the U-shaped conductor 200 is 6, and the stator slot 110 where the incoming wire end of the A-phase stator winding 20 is located is numbered 45, then the stator slot 110 where the incoming wire end of the B-phase stator winding 20 is located is numbered 1, and the stator slot 110 where the incoming wire end of the C-phase stator winding 20 is located is numbered 5. That is, the incoming wire ends of the A-phase stator winding 20, the B-phase stator winding 20, and the C-phase stator winding 20 are separated by 4 stator slots 110 in the circumferential direction of the stator core 10. The difference of y / 2+1 stator slots 110 may also mean that the incoming wire ends of the two-phase stator windings 20 are separated by y / 2 stator slots 110. For example, in the above example, the incoming wire ends of the A-phase stator winding 20 , the B-phase stator winding 20 , and the C-phase stator winding 20 are sequentially spaced apart by three stator slots 110 in the circumferential direction of the stator core 10 .

[0069] The incoming wire ends of the A-phase stator winding 20 and the U-phase stator winding 20 are separated by one stator slot 110 in the circumferential direction of the stator core 10. The incoming wire ends of the B-phase stator winding 20 and the V-phase stator winding 20 are separated by one stator slot 110 in the circumferential direction of the stator core 10. The incoming wire ends of the C-phase stator winding 20 and the W-phase stator winding 20 are separated by one stator slot 110 in the circumferential direction of the stator core 10. Among them, the A-phase stator winding 20, the B-phase stator winding 20, and the C-phase stator winding 20 can be connected in star or delta; the U-phase stator winding 20, the V-phase stator winding 20, and the W-phase stator winding 20 can be connected in star or delta. The outgoing wire ends of the six-phase stator winding 20 can be connected together by wires.

[0070] See also Figure 1 and Figure 8 , the following is a detailed description of the winding method of the B-phase stator winding 20 as an example. Figure 8In the figure, the solid arrow indicates the connection portion of the U-shaped conductor 200. The ends of the solid arrow indicate the stator slot 110 and the slot layer where the slot portion 220 of the U-shaped conductor 200 is located. The dashed arrow indicates the bend 230 of the U-shaped conductor 200. The direction indicated by the arrow is the winding direction of the B-phase stator winding 20. The solid arrow is located at the hairpin end II of the stator assembly 1, and the dashed arrow is located at the welding end I of the stator assembly 1. For ease of explanation, the 48 stator slots 110 are numbered separately, and the numbers 1-48 are used to represent the 48 stator slots 110 respectively. The 48 stator slots 110 include the first stator slot, the second stator slot, ..., the forty-eighth stator slot. Each stator slot 110 includes a first slot layer, a second slot layer, and a third slot layer. The first slot layer is represented by a, the second slot layer is represented by b, and the third slot layer is represented by c. The incoming terminal 21 b of the B-phase stator winding 20 is located in the first slot layer of the first stator slot, and the outgoing terminal 22 b is located in the first slot layer of the seventh stator slot.

[0071] The winding method of the B-phase stator winding is:

[0072] 1a→7b→13c→7c→1b→43a→37a→43b→1c→43c→37b→31a→25a→31b→37c→31c→25b→19a→13a→19b→25c→19c→13b→7a.

[0073] The B-phase stator winding 20 includes a plurality of first conductors 201, a plurality of first sub-conductors 202a, and a plurality of third conductors 203. Specifically, in the B-phase stator winding 20, the number of the first conductors 201, the first sub-conductors 202a, and the third conductors 203 is the same and is equal to the number of magnetic pole pairs p. In this embodiment, the number of the first conductors 201, the first sub-conductors 202a, and the third conductors 203 are all four. The B-phase stator winding 20 includes four conductor units connected in series, each of which is composed of a first conductor 201, a first sub-conductor 202a, and a third conductor 203. The winding steps are described below using the example of a B-phase stator winding 20 in which the number of the first conductors 201, the first sub-conductor 202a, and the third conductors 203 are all four.

[0074] Step 1: Install the first in-slot portion 221 of the first first conductor 201 into the first slot layer of the first stator slot, and install the second in-slot portion 222 into the second slot layer of the seventh stator slot. The first bent portion 231 of the first first conductor 201 serves as the incoming wire end 21b of the B-phase stator winding 20, and the second bent portion 232 bends in the first direction D1.

[0075] Step 2: The first in-slot portion 221 of the first third conductor 203 is inserted into the third slot layer of the seventh stator slot, and the second in-slot portion 222 is inserted into the third slot layer of the thirteenth stator slot. The second bent portion 232 of the first third conductor 203 is bent in the second direction D2 and connected to the second bent portion 232 of the first first conductor 201. The first bent portion 231 of the first third conductor 203 is bent in the second direction D2.

[0076] Step 3: The first in-slot portion 221 of the first first sub-conductor 202a is inserted into the first slot layer of the 43rd stator slot, and the second in-slot portion 222 is inserted into the second slot layer of the first stator slot. The second bent portion 232 of the first first sub-conductor 202a is bent in the first direction D1 and connected to the first bent portion 231 of the first third conductor 203. The first bent portion 231 of the first first sub-conductor 202a is bent in the second direction D2, away from the central axis of the stator core 10, by a distance of one slot layer.

[0077] Step 4: Replace the first conductor 201 with the second to fourth first conductors 201 in sequence, and repeat step 1. The first bending portions 231 and the second bending portions 232 of the second to fourth first conductors 201 are all bent toward the first direction D1.

[0078] The second to fourth third conductors 203 are sequentially replaced with the first third conductor 203 , and step 2 is repeated.

[0079] Replace the first sub-conductor 202a with the second through fourth first sub-conductors 202a in sequence, and repeat step 3. The first bend 231 of the first sub-conductor 202a is connected to the first bend 231 of the second first conductor 201, the first bend 231 of the second first sub-conductor 202a is connected to the first bend 231 of the third first conductor 201, and the first bend 231 of the third first sub-conductor 202a is connected to the first bend 231 of the fourth first conductor 201. The first bend 231 of the fourth first sub-conductor 202a serves as the output terminal 22b of the B-phase stator winding 20.

[0080] In the first embodiment, the connection relationship of the B-phase stator winding 20 is as follows:

[0081] The slot portion 220 corresponding to the second slot layer in the first stator slot 110 is connected to the slot portion 220 corresponding to the third slot layer in the seventh stator slot 110. The slot portion 220 corresponding to the third slot layer in the first stator slot 110 is connected to the slot portion 220 corresponding to the second slot layer in the forty-third stator slot 110. The slot portion 220 corresponding to the second slot layer in the seventh stator slot 110 is connected to the slot portion 220 corresponding to the third slot layer in the thirteenth stator slot 110. The slot portion 220 corresponding to the third slot layer in the nineteenth stator slot 110 is connected to the slot portion 220 corresponding to the second slot layer in the thirteenth stator slot 110. The slot portion 220 corresponding to the second slot layer in the nineteenth stator slot 110 is connected to the slot portion 220 corresponding to the third slot layer in the twenty-fifth stator slot 110. The slot portion 220 corresponding to the third slot layer in the 31st stator slot 110 is connected to the slot portion 220 corresponding to the second slot layer in the 25th stator slot 110. The slot portion 220 corresponding to the second slot layer in the 31st stator slot 110 is connected to the slot portion 220 corresponding to the third slot layer in the 37th stator slot 110. The slot portion 220 corresponding to the third slot layer in the 43rd stator slot 110 is connected to the slot portion 220 corresponding to the second slot layer in the 37th stator slot 110. The slot portion 220 corresponding to the first slot layer in the 13th stator slot 110 is connected to the slot portion 220 corresponding to the first slot layer in the 19th stator slot 110. The slot portion 220 corresponding to the first slot layer in the 25th stator slot 110 is connected to the slot portion 220 corresponding to the first slot layer in the 31st stator slot 110. The slot portion 220 corresponding to the first slot layer in the thirty-seventh stator slot 110 is connected to the slot portion 220 corresponding to the first slot layer in the forty-third stator slot 110 .

[0082] After obtaining the B-phase stator winding 20, the B-phase stator winding 20 is extended as a whole along the second direction D2 by four stator slots 110 to obtain the A-phase stator winding 20, and the B-phase stator winding 20 is extended as a whole along the first direction D1 by four stator slots 110 to obtain the C-phase stator winding 20; the A-phase stator winding 20, the B-phase stator winding 20, and the C-phase stator winding 20 are extended as a whole along the first direction D1 by one stator slot 110 to obtain the U-phase stator winding 20, the V-phase stator winding 20, and the W-phase stator winding 20.

[0083] Specifically, the inlet terminal 21a of the A-phase stator winding 20 is located in the first slot layer of the 45th stator slot, and the outlet terminal 22a is located in the first slot layer of the third stator slot. The winding method of the A-phase stator winding is:

[0084] 45a→3b→9c→3c→45b→39a→33a→39b→45c→39c→33b→27a→21a→27b→33c→37c→21b→15a→9a→15b→21c→15c→9b→3a.

[0085] The inlet terminal 21c of the C-phase stator winding 20 is located in the first slot layer of the fifth stator slot, and the outlet terminal 22c is located in the first slot layer of the eleventh stator slot. The winding method of the C-phase stator winding is:

[0086] 5a→11b→17c→11c→5b→47a→41a→47b→5c→47c→41b→35a→29a→35b→41c→35c→29b→23a→17a→23b→29c→23c→17b→11a.

[0087] The inlet terminal 21u of the U-phase stator winding 20 is located in the first slot layer of the 46th stator slot, and the outlet terminal 22u is located in the first slot layer of the 4th stator slot. The winding method of the U-phase stator winding is:

[0088] 46a→4b→10c→4c→46b→40a→34a→40b→46c→40c→34b→28a→22a→28b→34c→38c→22b→16a→10a→16b→22c→16c→10b→4a.

[0089] The inlet terminal 21v of the V-phase stator winding 20 is located in the first slot layer of the second stator slot, and the outlet terminal 22v is located in the first slot layer of the eighth stator slot. The winding method of the V-phase stator winding is:

[0090] 2a→8b→14c→8c→2b→44a→38a→44b→2c→44c→38b→32a→26a→32b→38c→32c→26b→20a→14a→20b→26c→20c→14b→8a.

[0091] The inlet terminal 21w of the W-phase stator winding 20 is located in the first slot layer of the sixth stator slot, and the outlet terminal 22w is located in the first slot layer of the twelfth stator slot. The winding method of the W-phase stator winding is:

[0092] 6a→12b→16c→12c→6b→48a→42a→48b→6c→48c→42b→36a→30a→36b→42c→36c→30b→24a→18a→24b→30c→24c→18b→12a.

[0093] Example 2:

[0094] See also Figure 1 、 Figure 9 、 Figure 10 and Figure 11The motor in the second embodiment of the present invention has a similar structure to the motor in the first embodiment, except that the number of slot layers in the stator slots 110 is configured as seven, i.e., L = 7. Each stator slot 110 houses seven slot portions 220, and all seven slot portions 220 belong to the same phase stator winding 20. Each stator slot 110 includes a first slot layer, a second slot layer, ..., and a seventh slot layer, with the seven slot layers being designated a, b, c, d, e, f, and g, respectively. The B-phase stator winding 20 also includes a plurality of first-type second sub-conductors 202b and a plurality of second-type second sub-conductors 202c.

[0095] The inlet terminal 21b of the B-phase stator winding 20 is located in the first slot layer of the first stator slot, and the outlet terminal 22b is located in the first slot layer of the seventh stator slot. The winding method of the B-phase stator winding is:

[0096] 1a→7b→13c→19d→25e→31f→37g→31g→25f→19e→13d→7c→1b→43a→37a→43b→1c→7d→13e→19f→25g→19g→13f→7e→1d→43c→37b→31a→25a→31b→37c→43d→1e→7f→13g→7g→1f→43e→37d→31c→25b→19a→13a→19b→25c→31d→37e→43f→1g→43g→37f→31e→25d→19c→13b→7a.

[0097] The B-phase stator winding 20 includes multiple first conductors 201, multiple first sub-conductors 202a, multiple third conductors 203, multiple first-type second sub-conductors 202b, and multiple second-type second sub-conductors 202c. In the B-phase stator winding 20, the number of first conductors 201, first sub-conductors 202a, and third conductors 203 is the same and equal to the number of magnetic pole pairs p. The number of first-type second sub-conductors 202b and second-type second sub-conductors 202c is the same and equal to the number of magnetic poles, i.e., 2p. In this embodiment, the number of first conductors 201, first sub-conductors 202a, and third conductors 203 is four each, and the number of first-type second sub-conductors 202b and second-type second sub-conductors 202c is eight each. The B-phase stator winding 20 includes four conductor units connected in series. Each conductor unit consists of a first conductor 201, a first sub-conductor 202a, a third conductor 203, two first-type second sub-conductors 202b, and two second-type second sub-conductors 202c. A first-type second sub-conductor 202b and a second-type second sub-conductor 202c are connected in series to form a conductor chain. The following describes the winding steps using the example of a B-phase stator winding 20 in which the number of first conductors 201, first sub-conductors 202a, and third conductors 203 are all four, and the number of first-type second sub-conductors 202b and second-type second sub-conductors 202c are both eight.

[0098] Step 1: Install the first in-slot portion 221 of the first first conductor 201 into the first slot layer of the first stator slot, and install the second in-slot portion 222 into the second slot layer of the seventh stator slot. The first bent portion 231 of the first first conductor 201 serves as the incoming wire end 21b of the B-phase stator winding 20, and the second bent portion 232 bends in the first direction D1.

[0099] Step 2: The first in-slot portion 221 of the first type-one second sub-conductor 202b is inserted into the third slot layer of the thirteenth stator slot, and the second in-slot portion 222 is inserted into the fourth slot layer of the nineteenth stator slot. The first bent portion 231 of the first type-one second sub-conductor 202b is bent in the second direction D2 and connected to the second bent portion 232 of the first first conductor 201. The second bent portion 232 of the first type-one second sub-conductor 202b is bent in the first direction D1.

[0100] Step 3: The first in-slot portion 221 of the first second-type second sub-conductor 202c is inserted into the fifth slot layer of the 25th stator slot, and the second in-slot portion 222 is inserted into the sixth slot layer of the 31st stator slot. The first bent portion 231 of the first second-type second sub-conductor 202c is bent in the second direction D2 and connected to the second bent portion 232 of the first first-type second sub-conductor 202b. The second bent portion 232 of the first second-type second sub-conductor 202c is bent in the first direction D1.

[0101] Step 4: The second in-slot portion 222 of the first third conductor 203 is inserted into the seventh slot layer of the thirty-seventh stator slot, and the first in-slot portion 221 is inserted into the seventh slot layer of the thirty-first stator slot. The second bend portion 232 of the first third conductor 203 is bent in the second direction D2 and connected to the second bend portion 232 of the first second-type second sub-conductor 202c. The first bend portion 231 of the first third conductor 203 is bent in the second direction D2.

[0102] Step 5: The second in-slot portion 222 of the second second-type second sub-conductor 202c is inserted into the sixth slot layer of the twenty-fifth stator slot, and the first in-slot portion 221 is inserted into the fifth slot layer of the nineteenth stator slot. The second bent portion 232 of the second second-type second sub-conductor 202c is bent in the first direction D1 and connected to the first bent portion 231 of the first third conductor 203. The first bent portion 231 of the second second-type second sub-conductor 202c is bent in the second direction D2.

[0103] Step 6: The second in-slot portion 222 of the second first-type second sub-conductor 202b is inserted into the fourth slot layer of the thirteenth stator slot, and the first in-slot portion 221 is inserted into the third slot layer of the seventh stator slot. The second bent portion 232 of the second first-type second sub-conductor 202b is bent in the first direction D1 and connected to the first bent portion 231 of the second second-type second sub-conductor 202c. The first bent portion 231 of the second first-type second sub-conductor 202b is bent in the second direction D2.

[0104] Step 7: The second in-slot portion 222 of the first first sub-conductor 202a is inserted into the second slot layer of the first stator slot, and the first in-slot portion 221 is inserted into the first slot layer of the forty-third stator slot. The second bent portion 232 of the first first sub-conductor 202a is bent in the first direction D1 and connected to the first bent portion 231 of the second first-type second sub-conductor 202b. The first bent portion 231 of the first first sub-conductor 202a is bent in the second direction D2, away from the central axis of the stator core 10 by a distance of one slot layer, and connected to the first bent portion 231 of the second first conductor 201.

[0105] In step 8, the second to fourth first conductors 201 replace the first first conductor 201 in sequence, and step 1 is repeated. The first bending portions 231 and the second bending portions 232 of the second to fourth first conductors 201 are all bent toward the first direction D1.

[0106] The third first-type second sub-conductor 202b, the fifth first-type second sub-conductor 202b, and the seventh first-type second sub-conductor 202b are sequentially substituted for the first first-type second sub-conductor 202b, and step 2 is repeated.

[0107] The third second-type second sub-conductor 202c, the fifth second-type second sub-conductor 202c, and the seventh second-type second sub-conductor 202c are sequentially substituted for the first second-type second sub-conductor 202c, and step three is repeated.

[0108] The second through fourth third conductors 203 replace the first third conductor 203 in sequence, and step 4 is repeated. The second bend 232 of the second third conductor 203 is connected to the second bend 232 of the third second-type second sub-conductor 202c, the second bend 232 of the third third conductor 203 is connected to the second bend 232 of the fifth second-type second sub-conductor 202c, and the second bend 232 of the fourth third conductor 203 is connected to the second bend 232 of the seventh second-type second sub-conductor 202c.

[0109] The fourth, sixth, and eighth second-type second sub-conductors 202c, 202c, and 202c of the second type second sub-conductor are sequentially substituted for the second second-type second sub-conductor 202c, and step 5 is repeated. The second bend portion 232 of the fourth second-type second sub-conductor 202c is connected to the first bend portion 231 of the second third conductor 203, the second bend portion 232 of the sixth second-type second sub-conductor 202c is connected to the first bend portion 231 of the third third conductor 203, and the second bend portion 232 of the eighth second-type second sub-conductor 202c is connected to the first bend portion 231 of the fourth third conductor 203.

[0110] The fourth first-type second sub-conductor 202b, the sixth first-type second sub-conductor 202b, and the eighth first-type second sub-conductor 202b are sequentially substituted for the second first-type second sub-conductor 202b, and step six is ​​repeated.

[0111] Replace the first sub-conductor 202a with the second through fourth first sub-conductors 202a in sequence, and repeat step 7. The first bend 231 of the first sub-conductor 202a is connected to the first bend 231 of the second first conductor 201, the first bend 231 of the second first sub-conductor 202a is connected to the first bend 231 of the third first conductor 201, and the first bend 231 of the third first sub-conductor 202a is connected to the first bend 231 of the fourth first conductor 201. The first bend 231 of the fourth first sub-conductor 202a serves as the output terminal 22b of the B-phase stator winding 20.

[0112] In the second embodiment, the connection relationship of the B-phase stator winding 20 is as follows:

[0113] The slot portions 220 corresponding to the second, fourth, and sixth slot layers in the first stator slot 110 are connected in a one-to-one correspondence to the slot portions 220 corresponding to the third, fifth, and seventh slot layers in the seventh stator slot 110. The slot portions 220 corresponding to the third, fifth, and seventh slot layers in the first stator slot 110 are connected in a one-to-one correspondence to the slot portions 220 corresponding to the second, fourth, and sixth slot layers in the forty-third stator slot 110. The slot portions 220 corresponding to the second, fourth, and sixth slot layers in the seventh stator slot 110 are connected in a one-to-one correspondence to the slot portions 220 corresponding to the third, fifth, and seventh slot layers in the thirteenth stator slot 110. The slot portions 220 corresponding to the third, fifth, and seventh slot layers in the nineteenth stator slot 110 are connected in a one-to-one correspondence to the slot portions 220 corresponding to the second, fourth, and sixth slot layers in the thirteenth stator slot 110, respectively. The slot portions 220 corresponding to the second, fourth, and sixth slot layers in the nineteenth stator slot 110 are connected in a one-to-one correspondence to the slot portions 220 corresponding to the third, fifth, and seventh slot layers in the twenty-fifth stator slot 110, respectively. The slot portions 220 corresponding to the third, fifth, and seventh slot layers in the thirty-first stator slot 110 are connected in a one-to-one correspondence to the slot portions 220 corresponding to the second, fourth, and sixth slot layers in the twenty-fifth stator slot 110, respectively. The slot portions 220 corresponding to the second, fourth, and sixth slot layers in the thirty-first stator slot 110 are connected in a one-to-one correspondence to the slot portions 220 corresponding to the third, fifth, and seventh slot layers in the thirty-seventh stator slot 110, respectively. The slot portions 220 corresponding to the third, fifth, and seventh slot layers in the forty-third stator slot 110 are connected one-to-one with the slot portions 220 corresponding to the second, fourth, and sixth slot layers in the thirty-seventh stator slot 110. The slot portion 220 corresponding to the first slot layer in the thirteenth stator slot 110 is connected with the slot portion 220 corresponding to the first slot layer in the nineteenth stator slot 110. The slot portion 220 corresponding to the first slot layer in the twenty-fifth stator slot 110 is connected with the slot portion 220 corresponding to the first slot layer in the thirty-first stator slot 110. The slot portion 220 corresponding to the first slot layer in the thirty-seventh stator slot 110 is connected with the slot portion 220 corresponding to the first slot layer in the forty-third stator slot 110.

[0114] After obtaining the B-phase stator winding 20, the B-phase stator winding 20 is extended as a whole along the second direction D2 by four stator slots 110 to obtain the A-phase stator winding 20, and the B-phase stator winding 20 is extended as a whole along the first direction D1 by four stator slots 110 to obtain the C-phase stator winding 20; the A-phase stator winding 20, the B-phase stator winding 20, and the C-phase stator winding 20 are extended as a whole along the first direction D1 by one stator slot 110 to obtain the U-phase stator winding 20, the V-phase stator winding 20, and the W-phase stator winding 20.

[0115] Specifically, the inlet terminal 21a of the A-phase stator winding 20 is located in the first slot layer of the 45th stator slot, and the outlet terminal 22a is located in the first slot layer of the third stator slot. The winding method of the A-phase stator winding is:

[0116] 45a→3b→9c→15d→21e→27f→33g→27g→21f→15e→9d→3c→45b→39a→33a→39b→45c→3d→9e→15f→21g→15g→9f→3e→45d→39c→33b→27a→21a→27b→33c→39d→45e→3f→9g→3g→45f→39e→33d→27c→21b→15a→9a→15b→21c→27d→33e→39f→45g→39g→33f→27e→21d→15c→9b→3a.

[0117] The inlet terminal 21c of the C-phase stator winding 20 is located in the first slot layer of the fifth stator slot, and the outlet terminal 22c is located in the first slot layer of the eleventh stator slot. The winding method of the C-phase stator winding is:

[0118] 5a→11b→17c→23d→29e→35f→41g→35g→29f→23e→17d→11c→5b→47a→41a→47b→5c→11d→17e→23f→29g→23g→17f→11e→5d→47c→41b→35a→29a→35b→41c→47d→5e→11f→17g→11g→5f→47e→41d→35c→29b→23a→17a→23b→29c→35d→41e→47f→5g→47g→41f→35e→29d→23c→17b→11a.

[0119] The inlet terminal 21u of the U-phase stator winding 20 is located in the first slot layer of the 46th stator slot, and the outlet terminal 22u is located in the first slot layer of the 4th stator slot. The winding method of the U-phase stator winding is:

[0120] 46a→4b→10c→16d→22e→28f→34g→28g→22f→16e→10d→4c→46b→40a→34a→40b→46c→4d→10e→16f→22g→16g→10f→4e→46d→40c→34b→28a→22a→28b→34c→40d→46e→4f→10g→4g→46f→40e→34d→28c→22b→16a→10a→16b→22c→28d→34e→40f→46g→40g→34f→28e→22d→16c→10b→4a.

[0121] The inlet terminal 21v of the V-phase stator winding 20 is located in the first slot layer of the second stator slot, and the outlet terminal 22v is located in the first slot layer of the eighth stator slot. The winding method of the V-phase stator winding is:

[0122] 2a→8b→14c→20d→26e→32f→38g→32g→26f→20e→14d→8c→2b→44a→38a→44b→2c→8d→14e→20f→26g→20g→14f→8e→2d→44c→38b→32a→26a→32b→38c→44d→2e→8f→14g→8g→2f→44e→38d→32c→26b→20a→14a→20b→26c→32d→38e→44f→2g→44g→38f→32e→26d→20c→14b→8a.

[0123] The inlet terminal 21w of the W-phase stator winding 20 is located in the first slot layer of the sixth stator slot, and the outlet terminal 22w is located in the first slot layer of the twelfth stator slot. The winding method of the W-phase stator winding is:

[0124] 6a→12b→18c→24d→30e→36f→42g→36g→30f→24e→18d→12c→6b→48a→42a→48b→6c→12d→18e→24f→30g→24g→18f→12e→6d→48c→42b→36a→30a→36b→42c→48d→6e→12f→18g→12g→6f→48e→42d→36c→30b→24a→18a→24b→30c→36d→42e→48f→6g→48g→42f→36e→30d→24c→18b→12a.

[0125] It should be noted that, in the embodiments provided by the present invention, three slot layers and seven slot layers are provided in the stator slot 110 as an example for explanation. In the actual application of the stator assembly 1, the number of slot layers in each stator slot 110 includes but is not limited to three slot layers and seven slot layers, and can also be five slot layers, nine slot layers, etc. The winding method of the stator winding 20 of each phase can refer to the winding method of the above-mentioned three slot layers and seven slot layers.

[0126] Embodiments of the present invention also provide a motor configured as a flat wire motor. The motor includes a rotor and a stator assembly 1 described in any of the above embodiments. The rotor is disposed within a stator core 10, and the stator winding 20 is used to drive the rotor to rotate relative to the stator core 10. Embodiments of the present invention also provide a vehicle including the motor. The vehicle can be an electric vehicle, a hybrid vehicle, a fuel cell vehicle, or the like.

[0127] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A stator assembly, characterized in that: include: a stator core, wherein the stator core is provided with z stator slots, the z stator slots being arranged at intervals along the circumferential direction of the stator core, and each stator slot is provided with L slot layers arranged along the radial direction of the stator core, wherein z is an integer greater than or equal to 6, and L is an odd number greater than 3; A stator winding, comprising m-phase stator windings, wherein m is a multiple of 3; each phase of the stator winding comprises a plurality of U-shaped conductors, the U-shaped conductors being configured as flat wire conductors, each of the U-shaped conductors comprising a connecting portion, two in-slot portions, and two bent portions; the two in-slot portions comprising a first in-slot portion and a second in-slot portion, the two bent portions comprising a first bent portion and a second bent portion; the first in-slot portion and the second in-slot portion are respectively connected to two ends of the connecting portion, the first bent portion being connected to an end of the first in-slot portion facing away from the connecting portion, and the second bent portion being connected to an end of the second in-slot portion facing away from the connecting portion; the first in-slot portion and the second in-slot portion of each U-shaped conductor are respectively disposed in two different stator slots, and the pitch between the first in-slot portion and the second in-slot portion is y stator slots; Each slot layer is provided with an in-slot portion, and the in-slot portion in each stator slot belongs to the stator winding of the same phase; The plurality of U-shaped conductors include a plurality of first conductors, a plurality of second conductors and a plurality of third conductors; The first slot portion of each first conductor passes through the first slot layer of one of the stator slots, and the second slot portion passes through the second slot layer of another stator slot; the first bent portion of one of the first conductors in each phase of the stator winding is configured as an incoming wire end, and the second bent portion is bent along a first direction, and the first bent portions and second bent portions of the remaining first conductors are all bent in the first direction; wherein the first direction is along the circumferential direction of the stator core; The plurality of second conductors include a plurality of first sub-conductors and N types of second sub-conductors, wherein the first in-slot portion of each first sub-conductor passes through the first slot layer of one of the stator slots, and the second in-slot portion passes through the second slot layer of another stator slot; the first bent portion of the first sub-conductor adjacent to the incoming end in the first direction in each phase of the stator winding is configured as an outgoing end, and the second bent portion is bent along the first direction; the first bent portions of the remaining first sub-conductors are bent in a second direction, and the second bent portions are bent in the first direction; wherein the second direction is along the circumferential direction of the stator core and is opposite to the first direction; The first in-slot portion of the second sub-conductor passes through the k+2th slot layer of one of the stator slots, and the second in-slot portion passes through the k+3th slot layer of another stator slot, and the first in-slot portions of different types of second sub-conductors are located in different slot layers and the second in-slot portions are located in different slot layers, wherein N=(L-3) / 2, k is greater than or equal to 1 and less than L-3; the first bent portion of the second sub-conductor is bent in the second direction, and the second bent portion is bent in the first direction; The first in-slot portion of each of the third conductors passes through the Lth slot layer of one of the stator slots, and the second in-slot portion passes through the Lth slot layer of another stator slot; the first bent portion and the second bent portion of each of the third conductors are bent toward the second direction; Each phase of the stator winding is formed by a plurality of conductor units connected in series, each of which includes one first conductor, one first sub-conductor, 2N second sub-conductors, and one third conductor; wherein the 2N second sub-conductors are connected to form two conductor chains, and each conductor chain is formed by N types of second sub-conductors connected in series, with the second bend of each type of second sub-conductor connected to the first bend of another type of second sub-conductor; In each of the conductor units, the second bend portion of the first conductor is connected to the second bend portion of the third conductor through one of the conductor chains, the first bend portion of the third conductor is connected to the second bend portion of the first sub-conductor through another conductor chain, and the first bend portion of the first sub-conductor is connected to the first bend portion of the first conductor in another conductor unit.

2. The stator assembly according to claim 1, characterized in that In each phase of the stator winding, the incoming wire end is bent for a distance in a direction away from the central axis of the stator core, and then bent in a direction away from the connecting portion and parallel to the central axis of the stator core; and / or, the outgoing wire end is bent for a distance in a direction away from the central axis of the stator core, and then bent in a direction away from the connecting portion and parallel to the central axis of the stator core; or, The incoming line end is bent toward the first direction, or the outgoing line end is bent toward the second direction.

3. The stator assembly according to claim 1, characterized in that The first bent portion of the first sub-conductor is bent in a direction away from the central axis of the stator core by a distance of one slot layer; or The first bent portion of the first conductor is bent in a direction away from the central axis of the stator core by a distance of one slot layer.

4. The stator assembly according to claim 1, wherein: The difference between the incoming end and the outgoing end of the stator winding of the same phase is y stator slots; the incoming end and the outgoing end of the stator winding of each phase are both located in the first slot layer of the stator slot.

5. The stator assembly according to claim 1, characterized in that In each U-shaped conductor, one end of each bent portion facing away from the slot portion is a welding portion; each phase of the stator winding includes a first portion and a second portion distributed along the circumferential direction of the stator core; In the first portion, the stator winding has a first welding area, and the first welding area has L-1 welding portions; In the second portion, the stator winding has a plurality of first welding areas and a plurality of second welding areas alternately arranged, each of the first welding areas has L-1 welding portions, and each of the second welding areas has L+1 welding portions.

6. The stator assembly according to claim 1, wherein: The m-phase stator winding includes a first group of stator windings and a second group of stator windings, the first group of stator windings includes an A-phase stator winding, a B-phase stator winding, and a C-phase stator winding, and the second group of stator windings includes a U-phase stator winding, a V-phase stator winding, and a W-phase stator winding; The inlet ends of the A-phase stator winding, the B-phase stator winding, and the C-phase stator winding are sequentially spaced apart by y / 2+1 stator slots in the circumferential direction of the stator core; the inlet ends of the U-phase stator winding, the V-phase stator winding, and the W-phase stator winding are sequentially spaced apart by y / 2+1 stator slots in the circumferential direction of the stator core; The incoming wire ends of the A-phase stator winding and the U-phase stator winding are separated by one stator slot in the circumferential direction of the stator core; the incoming wire ends of the B-phase stator winding and the V-phase stator winding are separated by one stator slot in the circumferential direction of the stator core; the incoming wire ends of the C-phase stator winding and the W-phase stator winding are separated by one stator slot in the circumferential direction of the stator core.

7. The stator assembly according to claim 1, characterized in that The stator assembly is suitable for a motor with z slots, 2p poles and m phases, wherein z represents the number of stator slots; p represents the number of magnetic pole pairs of the motor, and p is an integer greater than 0; the number of slots per pole and per phase of the motor is represented by q, q=z / (2pm), and the number of parallel branches of the motor is represented by a, a≤q; When L=7, y=6, q=1, and z=48, the seven slot layers are represented by a, b, c, d, e, f, and g, respectively; the 48 stator slots are represented by 1, 2, ..., 48, respectively. The winding method of one phase of the m-phase stator winding is: 1a→7b→13c→19d→25e→31f→37g→31g→25f→19e→13d→7c→1b→43a→37a→43b→1c→7d→13e→19f→25g→19g→13f→7e→1d→43c→37b→31a→25a→31b→37c→43d→1e→7f→13g→7g→1f→43e→37d→31c→25b→19a→13a→19b→25c→31d→37e→43f→1g→43g→37f→31e→25d→19c→13b→7a.

8. The stator assembly according to claim 1, wherein: In one phase of the stator winding of the m-phase stator winding, the X-th stator slot is the incoming line end of the stator winding of this phase; The slot portion corresponding to the 2x+1 slot layer in the X+(2n+1)y-th stator slot is connected to the slot portion corresponding to the 2x slot layer in the X+2ny-th stator slot, and the slot portion corresponding to the 2x slot layer in the X+(2n+1)y-th stator slot is connected to the slot portion corresponding to the 2x+1 slot layer in the X+(2n+2)y-th stator slot; The slot portion corresponding to the first slot layer in the X+2ny-th stator slot is connected to the slot portion corresponding to the first slot layer in the X+(2n+1)y-th stator slot; Wherein, n is an integer greater than or equal to 1 and less than z / (2y), and x is an integer greater than or equal to 1 and less than or equal to (L-1) / 2; when X+(2n+2)y is greater than z, the value of X+(2n+2)y is expressed as X+(2n+2)yz.

9. A motor, characterized in that: The invention comprises a stator assembly according to any one of claims 1 to 8.

10. A vehicle, characterized in that: Comprising the motor as claimed in claim 9.

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