Stator assembly, motor and vehicle

Abstract

The invention discloses a stator assembly, a motor and a vehicle, the stator assembly comprises a stator core and a stator winding, the stator winding is a lap winding and comprises a three-phase winding, a winding branch of each phase winding comprises two outgoing lines located at the two ends, the outgoing lines are provided with connecting parts connected with a busbar, and the connecting parts are connected with the busbar. The three-phase winding comprises a U-phase winding, a V-phase winding and a W-phase winding, the deviation direction of the V-phase winding relative to the U-phase winding is a first direction, in the direction close to the connecting part, an outgoing line of the U-phase winding is twisted along the first direction, and outgoing lines of the V-phase winding and the W-phase winding are twisted along a second direction, so that the connecting parts of the three-phase winding are continuously arranged; the second direction is opposite to the first direction. According to the stator assembly, the space occupied by the connecting part of the three-phase winding in the circumferential direction of the stator iron core can be reduced, and the size of the bus bar in the circumferential direction of the stator iron core can be conveniently reduced so as to reduce the space occupied by the bus bar.

Description

Technical Field

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

[0002] With the rapid development of the new energy industry, while the demand for the number of drive motors is increasing day by day, the performance requirements for motors are becoming more and more stringent, the requirements for motor cost and size are becoming more and more stringent, and the manufacturing difficulty and cost of the stator play a decisive role. Among them, the winding needs to be connected to an external electronic control device through a bus bar. However, in the related art, due to the unreasonable layout of the lead wires of the stator winding, the bus bar occupies a large space. Therefore, improvement is needed. Summary of the Invention

[0003] The first aspect of the present invention provides a stator assembly, which has the advantage of being able to centrally arrange connection parts to reduce the space occupied by the bus bar.

[0004] The stator assembly according to an embodiment of the first aspect of the present invention includes: a stator core having a plurality of stator slots arranged at intervals in the circumferential direction of the stator core; a stator winding wound in the plurality of stator slots, the stator winding being a lap winding and including three-phase windings, and each winding branch of each phase winding includes two lead wires at both ends, the lead wires having connection parts adapted to be connected to a bus bar. In one winding branch, the number of stator slots by which the lead wire at the input end is offset from the lead wire at the output end is N / 2P. The three-phase windings are respectively a U-phase winding, a V-phase winding, and a W-phase winding. The number of stator slots by which the V-phase winding is offset from the U-phase winding and the number of stator slots by which the W-phase winding is offset from the V-phase winding are N / 3P, where N is the number of stator slots and P is the number of pole pairs. Among them, the direction in which the V-phase winding is offset from the U-phase winding in the circumferential direction of the stator core is the first direction. In the axial direction of the stator core towards the direction close to the connection part, the lead wire of the U-phase winding is twisted in the first direction, and the lead wires of the V-phase winding and the W-phase winding are twisted in the second direction so that the connection parts of the three-phase windings are continuously arranged, and the second direction is opposite to the first direction.

[0005] The stator assembly according to an embodiment of the first aspect of the present invention can reduce the space occupied by the connection parts of the three-phase windings in the circumferential direction of the stator core by twisting the lead wires of the V-phase winding and the W-phase winding in the opposite direction to the lead wire of the U-phase winding, which is convenient for reducing the size of the bus bar in the circumferential direction of the stator core to reduce the space occupied by the bus bar, and the structure is compact.

[0006] According to some embodiments of the present invention, the two lead-out wires of the U-phase winding are respectively the U-phase incoming wire and the U-phase outgoing wire, the two lead-out wires of the V-phase winding are respectively the V-phase incoming wire and the V-phase outgoing wire, and the two lead-out wires of the W-phase winding are respectively the W-phase incoming wire and the W-phase outgoing wire. In the circumferential direction of the stator core, the connection parts of the V-phase incoming wire, the W-phase incoming wire, the U-phase incoming wire, the V-phase outgoing wire, the W-phase outgoing wire, and the U-phase outgoing wire are arranged in sequence.

[0007] According to some embodiments of the present invention, the lead-out wire includes an inner part of the first slot and a first pin. The inner part of the first slot is disposed in the stator slot, and the first pin is connected to the end of the inner part of the first slot and is twisted along the circumferential direction of the stator core relative to the inner part of the first slot. The connection part is formed on the first pin and extends along the axial direction of the stator core. The number of slots of the stator slot corresponding to the span by which the connection part deflects relative to the inner part of the first slot is N / 4P.

[0008] According to some embodiments of the present invention, the lead-out wire is an I-shaped coil. The I-shaped coil includes an inner part of the first slot, a first pin, and a second pin. The inner part of the first slot is disposed in the stator slot, and the first pin and the second pin are respectively connected to both ends of the inner part of the first slot. The connection part is formed on one of the first pin and the second pin. The I-shaped coil includes a first I-shaped coil and a second I-shaped coil. Along the circumferential direction of the stator core, the first pin and the second pin of the first I-shaped coil are twisted in the same direction relative to the inner part of the first slot, and the first pin and the second pin of the second I-shaped coil are twisted in opposite directions relative to the inner part of the first slot. The U-phase incoming wire and the U-phase outgoing wire are the first I-shaped coils, and the V-phase incoming wire, the V-phase outgoing wire, the W-phase incoming wire, and the W-phase outgoing wire are the second I-shaped coils.

[0009] According to some embodiments of the present invention, the stator core includes a first arrangement area and a second arrangement area arranged circumferentially. All the connection parts of the stator winding are concentrated in the first arrangement area, and the central angle corresponding to the first arrangement area is not greater than 90°.

[0010] According to some embodiments of the present invention, each stator slot has multiple layers of slot layers arranged radially along the stator core, and multiple lead-out wires are all located in the outermost layer of the slot layer; and / or, in the axial direction of the stator core, the stator winding has a crown end and a welding end located on opposite sides of the stator core, and the connection part is located on the crown end side.

[0011] According to some embodiments of the present invention, each of the stator slots has multiple slot layers arranged radially along the stator core, there are M layers of the slot layers, each phase winding includes multiple parallel winding branches, each winding branch includes multiple first coil groups and multiple second coil groups, the multiple first coil groups and the multiple second coil groups are alternately arranged and connected along the circumferential direction of the stator core, the first coil group includes multiple U-shaped coils arranged radially along the stator core from the second layer to the (M - 1)-th layer of the slot layers and connected end to end in sequence, the second coil group includes multiple U-shaped coils arranged radially along the stator core from the first layer to the M-th layer of the slot layers and connected end to end in sequence, in the circumferential direction of the stator core, one end of the second coil group is connected to the adjacent first coil group on one side through the U-shaped coil located in the first layer of the slot layer, and the other end of the second coil group is connected to the adjacent first coil group on the other side through the U-shaped coil located in the M-th layer of the slot layer.

[0012] According to some embodiments of the present invention, on the same winding branch, the coils arranged in the first layer and the M-th layer of the slot layers are set to cross wires within the same layer, and the coils arranged in the second layer to the (M - 1)-th layer of the slot layers are set to cross wires between two adjacent slot layers of different stator slots.

[0013] According to some embodiments of the present invention, on the same winding branch, the U-shaped coil has a crown portion, two second slot interiors and two third pins, the two third pins are respectively connected to both ends of the crown portion through the two second slot interiors, the second slot interiors are disposed through the stator slots, the U-shaped coil includes a first U-shaped coil and a second U-shaped coil, along the circumferential direction of the stator core, the two third pins of the first U-shaped coil are twisted in a direction close to each other, the two third pins of the second U-shaped coil are twisted in the same direction, the first coil group includes multiple first U-shaped coils, the second coil group includes multiple first U-shaped coils and two second U-shaped coils, the first U-shaped coils are disposed in the second layer to the (M - 1)-th layer of the slot layers, and the second U-shaped coils are disposed in the first layer and the M-th layer of the slot layers.

[0014] According to some embodiments of the present invention, the first U-shaped coil includes a first coil and a second coil with different spans, the second U-shaped coil includes a third coil and a fourth coil with different spans, the spans of the first coil and the third coil are the same, and the spans of the second coil and the fourth coil are the same. In the same-phase winding, in the circumferential direction of the stator core, inside the two second slots of the second coil in one winding branch, they are respectively located on the opposite sides of the corresponding first coil in the remaining winding branches. Inside the two second slots of the fourth coil in one winding branch, they are respectively located on the opposite sides of the corresponding third coil in the remaining winding branches.

[0015] According to some embodiments of the present invention, the stator winding includes a plurality of U-shaped coils, and the U-shaped coil includes a crown portion. The crown portion includes a first torsion portion, a second torsion portion, and a bent connection portion connecting the first torsion portion and the second torsion portion. In the direction from the central axis of the stator core towards the outer peripheral side of the stator core, the bending directions of the bent connection portions of the U-shaped coils located in the first layer and the Mth layer are the same as the bending directions of the bent connection portions of the U-shaped coils located in the second layer to the (M - 1)th layer.

[0016] A second aspect of the present invention provides a motor.

[0017] The motor according to the embodiment of the second aspect of the present invention includes: the above-mentioned stator assembly.

[0018] For the motor according to the embodiment of the second aspect of the present invention, by twisting the lead wires of the V-phase winding and the W-phase winding in the opposite direction to the lead wires of the U-phase winding, the space occupied by the connection portions of the three-phase windings in the circumferential direction of the stator core can be reduced, facilitating the reduction of the size of the busbar in the circumferential direction of the stator core to reduce the space occupied by the busbar, and the structure is compact.

[0019] A third aspect of the present invention provides a vehicle.

[0020] The vehicle according to the embodiment of the third aspect of the present invention includes: the above-mentioned motor.

[0021] For the vehicle according to the embodiment of the third aspect of the present invention, by twisting the lead wires of the V-phase winding and the W-phase winding in the opposite direction to the lead wires of the U-phase winding, the space occupied by the connection portions of the three-phase windings in the circumferential direction of the stator core can be reduced, facilitating the reduction of the size of the busbar in the circumferential direction of the stator core to reduce the space occupied by the busbar, and the structure is compact.

[0022] The additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0023] Figure 1 is a schematic diagram of a stator assembly according to an embodiment of the present invention;

[0024] Figure 2 is a sectional view along the axial direction of the stator assembly according to an embodiment of the present invention;

[0025] Figure 3 is Figure 2 an enlarged view of area A in

[0026] Figure 4 is a partial top view of one side of the connecting portion of the stator assembly according to an embodiment of the present invention;

[0027] Figure 5 is a schematic diagram of the first I-shaped coil of the stator assembly according to an embodiment of the present invention;

[0028] Figure 6 is a schematic diagram of the second I-shaped coil of the stator assembly according to an embodiment of the present invention;

[0029] Figure 7 is a front view of the stator assembly according to an embodiment of the present invention;

[0030] Figure 8 is a schematic diagram of the first coil of the stator assembly according to an embodiment of the present invention;

[0031] Figure 9 is a schematic diagram of the second coil of the stator assembly according to an embodiment of the present invention;

[0032] Figure 10 is a schematic diagram of the third coil of the stator assembly according to an embodiment of the present invention;

[0033] Figure 11 is a schematic diagram of the fourth coil of the stator assembly according to an embodiment of the present invention;

[0034] Figure 12 is a top view of the stator assembly according to an embodiment of the present invention;

[0035] Figure 13 is Figure 12 an enlarged view of area B in

[0036] Figure 14 is a schematic diagram of the U-shaped coil of the stator assembly according to an embodiment of the present invention;

[0037] Figure 15 is a schematic diagram of another angle of the stator assembly according to an embodiment of the present invention;

[0038] Figure 16 is Figure 15 an enlarged view of area C in.

[0039] Reference numerals:

[0040] 100, stator assembly;

[0041] 1, stator core; 11, stator slot; 111, slot layer;

[0042] 2, stator winding; 20a, crown end; 20b, welding end; 20b1, pin;

[0043] 21, lead wire; 21a, first I-shaped coil; 21b, second I-shaped coil; 21c, U-phase inlet wire; 21d, V-phase inlet wire; 21e, W-phase inlet wire; 21f, U-phase outlet wire; 21g, V-phase outlet wire; 21h, W-phase outlet wire; 211, connecting part; 212, first inner slot; 213, first pin; 214, second pin;

[0044] 22a, first coil; 22b, second coil; 22c, third coil; 22d, fourth coil; 221, crown part; 2211, first torsion part; 2212, second torsion part; 2213, bending connection part; 222, second inner slot; 223, third pin. Detailed implementation manners

[0045] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0046] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the applicability of other processes and / or the use of other materials.

[0047] The stator assembly 100 according to the first aspect embodiment of the present invention will be described below with reference to the drawings.

[0048] As Figures 1 to 3As shown, the stator assembly 100 according to an embodiment of the first aspect of the present invention includes: a stator core 1 and a stator winding 2. The stator core 1 has a plurality of stator slots 11 arranged at intervals in the circumferential direction of the stator core 1. The stator winding 2 is wound in the plurality of stator slots 11. The stator winding 2 is a lap winding and includes three-phase windings. Each winding branch of each phase winding includes two lead-out wires 21 located at both ends. The lead-out wire 21 has a connection portion 211 adapted to be connected to a bus bar. In a winding branch, the number of stator slot 11s by which the lead-out wire 21 at the input end is offset from the lead-out wire 21 at the output end is N / 2P. The three-phase windings are a U-phase winding, a V-phase winding, and a W-phase winding respectively. The number of stator slot 11s by which the V-phase winding is offset from the U-phase winding and the number of stator slot 11s by which the W-phase winding is offset from the V-phase winding are N / 3P. N is the number of stator slots 11, and P is the number of pole pairs. Among them, the direction in which the V-phase winding is offset from the U-phase winding in the circumferential direction of the stator core 1 is the first direction. In the direction along the axial direction of the stator core 1 towards the connection portion 211, the lead-out wire 21 of the U-phase winding is twisted in the first direction, and the lead-out wires 21 of the V-phase winding and the W-phase winding are twisted in the second direction so that the connection portions 211 of the three-phase windings are continuously arranged. The second direction is opposite to the first direction.

[0049] It should be noted that the number of stator slot 11s of the offset refers to the difference between the numbers of two corresponding stator slots 11 when the plurality of stator slots 11 are numbered in the same clockwise direction. For example, if the number of the stator slot 11 corresponding to the lead-out wire at the input end of the first winding branch of the U-phase winding is 1, and the number of the stator slot 11 corresponding to the lead-out wire at the input end of the first winding branch of the V-phase winding is 7, then the deflection distance of the lead-out wire at the input end of the first winding branch of the V-phase winding relative to the lead-out wire at the input end of the first winding branch of the U-phase winding is six stator slots 11. The same applies to the span, which will not be elaborated here. The twisting direction of the lead-out wire 21 refers to the deflection direction of the connection portion 211 of the lead-out wire 21 relative to the portion of the lead-out wire 21 located in the stator slot 11 in the circumferential direction of the stator core 1.

[0050] Among them, by twisting the lead-out wires 21 of the V-phase winding and the W-phase winding in the opposite direction to the lead-out wire 21 of the U-phase winding, such as in the circumferential direction of the stator core 1, the first direction can be the counterclockwise direction, and the second direction can be the clockwise direction. It is possible to avoid the lead-out wires 21 of the U-phase winding, the V-phase winding, and the W-phase winding being twisted in the same direction, resulting in the connection portions 211 of the three-phase windings occupying too much space in the circumferential direction of the stator core 1, so that the connection portions 211 of the U-phase winding, the V-phase winding, and the W-phase winding can be concentrated. It can be understood that the larger the space occupied by the connection portions 211 of the three-phase windings in the circumferential direction of the stator core 1, the larger the space that the bus bar needs to cover and occupy.

[0051] Therefore, by twisting the lead wires 21 of the V-phase winding and the W-phase winding in the opposite direction to the lead wires 21 of the U-phase winding, the space occupied by the connection portion 211 of the three-phase windings in the circumferential direction of the stator core 1 can be reduced, facilitating the reduction of the size of the bus bar in the circumferential direction of the stator core 1 to reduce the space occupied by the bus bar, and the structure is compact.

[0052] For the stator assembly 100 according to the embodiment of the first aspect of the present invention, by twisting the lead wires 21 of the V-phase winding and the W-phase winding in the opposite direction to the lead wires 21 of the U-phase winding, the space occupied by the connection portion 211 of the three-phase windings in the circumferential direction of the stator core 1 can be reduced, facilitating the reduction of the size of the bus bar in the circumferential direction of the stator core 1 to reduce the space occupied by the bus bar, and the structure is compact.

[0053] According to some embodiments of the present invention, the two lead wires 21 of the U-phase winding are respectively the U-phase incoming line 21c and the U-phase outgoing line 21f, the two lead wires 21 of the V-phase winding are respectively the V-phase incoming line 21d and the V-phase outgoing line 21g, and the two lead wires 21 of the W-phase winding are respectively the W-phase incoming line 21e and the W-phase outgoing line 21h. In the circumferential direction of the stator core 1, the connection portions of the V-phase incoming line 21d, the W-phase incoming line 21e, the U-phase incoming line 21c, the V-phase outgoing line 21g, the W-phase outgoing line 21h, and the U-phase outgoing line 21f are arranged in sequence.

[0054] Specifically, in the circumferential direction of the stator core 1, the stator slots 11 corresponding to the V-phase incoming line 21d, the W-phase outgoing line 21h, the U-phase incoming line 21c, and the V-phase outgoing line 21g are continuously arranged in sequence along the first direction. The W-phase incoming line 21e is located on the side of the V-phase incoming line 21d away from the W-phase outgoing line 21h, and the stator slot 11 corresponding to the W-phase incoming line 21e is arranged at an interval from the stator slot 11 corresponding to the V-phase incoming line 21d. The U-phase outgoing line 21f is located on the side of the V-phase incoming line 21d away from the U-phase incoming line 21c, and the stator slot corresponding to the U-phase outgoing line 21f is arranged at an interval from the stator slot corresponding to the V-phase outgoing line 21g. In the direction towards the connection portion 211, the W-phase incoming line 21e and the V-phase incoming line 21d are twisted towards the direction of approaching each other, the U-phase incoming line 21c and the V-phase outgoing line 21g are twisted towards the direction of approaching the W-phase incoming line 21e, and the W-phase outgoing line 21h and the U-phase incoming line 21c are twisted towards the direction away from the W-phase incoming line 21e.

[0055] That is to say, in the direction approaching the connecting portion 211, the stator slot 11 for the W-phase incoming line 21e is located on the side of the stator slot 11 for the V-phase incoming line 21d that is away from the stator slot 11 for the W-phase outgoing line 21h, and the stator slot 11 for the U-phase outgoing line 21f is located on the side of the stator slot 11 for the V-phase incoming line 21d that is away from the stator slot for the U-phase incoming line 21c. According to the passing positions of the U-phase incoming line 21c, V-phase incoming line 21d, W-phase incoming line 21e, U-phase outgoing line 21f, V-phase outgoing line 21g, and W-phase outgoing line 21h on the stator core 1, by adjusting the twisting directions of the U-phase incoming line 21c, V-phase incoming line 21d, W-phase incoming line 21e, U-phase outgoing line 21f, V-phase outgoing line 21g, and W-phase outgoing line 21h, the connecting portions 211 of the U-phase incoming line 21c, V-phase incoming line 21d, W-phase incoming line 21e, U-phase outgoing line 21f, V-phase outgoing line 21g, and W-phase outgoing line 21h are concentrated, facilitating the reduction of the size of the bus bar in the circumferential direction of the stator core 1 to reduce the space occupied by the stator winding 2 and the bus bar.

[0056] Among them, the number of stator slots 11 spaced between the stator slot 11 corresponding to the W-phase incoming line 21e and the stator slot 11 corresponding to the V-phase incoming line 21d is n, and the number of stator slots 11 spaced between the stator slot 11 corresponding to the U-phase outgoing line 21f and the stator slot 11 corresponding to the V-phase outgoing line 21g is n, where n is the number of winding branches of each phase winding. The V-phase incoming line 21d and the V-phase outgoing line 21g are spaced apart, the W-phase incoming line 21e and the W-phase outgoing line 21h are spaced apart, and the U-phase incoming line 21c and the U-phase outgoing line 21f are spaced apart, and the intervals between the V-phase incoming line 21d and the V-phase outgoing line 21g, between the W-phase incoming line 21e and the W-phase outgoing line 21h, and between the U-phase incoming line 21c and the U-phase outgoing line 21f are the same, making the layout of the lead wires 21 of the three-phase windings regular, which can reduce the design difficulty of the bus bar and thus reduce the design difficulty of the motor. Among them, the positions of the U-phase, V-phase, and W-phase can be interchanged, which will not be elaborated here.

[0057] According to some embodiments of the present invention, the lead wire 21 includes a first inner slot portion 212 and a first pin 213. The first inner slot portion 212 is passed through the stator slot 11, and the first pin 213 is connected to the end of the first inner slot portion 212 and is twisted circumferentially with respect to the first inner slot portion 212 along the stator core 1. The connecting portion 211 is formed on the first pin 213 and extends axially along the stator core 1. The number of stator slots corresponding to the span by which the connecting portion 211 deflects with respect to the first inner slot portion 212 is N / 4P. Specifically, the end of the first pin 213 away from the first inner slot portion 212 constitutes the connecting portion 211. Thus, it is convenient for the concentrated arrangement of the connecting portions 211 of the three-phase windings, thereby reducing the size of the bus bar and the installation difficulty of the bus bar.

[0058] According to some embodiments of the present invention, such as Figure 5 andFigure 6 As shown, the lead wire 21 is an I-shaped coil. The I-shaped coil includes an inner part 212 of the first slot, a first pin 213, and a second pin 214. The inner part 212 of the first slot is disposed in the stator slot 11. The first pin 213 and the second pin 214 are respectively connected to two ends of the inner part 212 of the first slot. The connecting portion 211 is formed on one of the first pin 213 and the second pin 214. The I-shaped coil includes a first I-shaped coil 21a and a second I-shaped coil 21b. Along the circumferential direction of the stator core 1, the first pin 213 and the second pin 214 of the first I-shaped coil 21a are twisted in the same direction relative to the inner part 212 of the first slot, and the first pin 213 and the second pin 214 of the second I-shaped coil 21b are twisted in opposite directions relative to the inner part 212 of the first slot. The U-phase incoming line 21c and the U-phase outgoing line 21f are the first I-shaped coil 21a, and the V-phase incoming line 21d, the V-phase outgoing line 21g, the W-phase incoming line 21e, and the W-phase outgoing line 21h are the second I-shaped coil 21b.

[0059] It can be understood that when the lead wires 21 of the three-phase windings are arranged in the same slot layer 111, for the convenience of connection, generally, one end of the lead wire 21 far from the connecting portion 211 needs to be twisted in the same direction. For example, when the connecting portion 211 is disposed on the first pin 213, the second pins 214 of all the lead wires 21 need to be twisted in the same direction. Therefore, by adopting I-shaped coils of two line shapes, it can be better ensured that one end of the lead wires 21 of the three-phase windings is twisted in the same direction and the other end is concentratedly arranged.

[0060] For example, along the circumferential direction of the stator core 1, the first pin 213 of the first I-shaped coil 21a is twisted clockwise relative to the inner part 212 of the first slot, and the second pin 214 of the first I-shaped coil 21a is twisted counterclockwise relative to the inner part 212 of the first slot; or, the first pin 213 of the first I-shaped coil 21a is twisted counterclockwise relative to the inner part 212 of the first slot, and the second pin 214 of the first I-shaped coil 21a is twisted clockwise relative to the inner part 212 of the first slot; the first pin 213 and the second pin 214 of the second I-shaped coil 21b are both twisted clockwise or counterclockwise relative to the inner part 212 of the first slot. Thus, according to the winding situation of the stator winding 2, by selecting the first I-shaped coil 21a and the second I-shaped coil 21b, the position of the connecting portion 211 can be flexibly adjusted so that the connecting portions 211 are concentratedly arranged, thereby reducing the space occupied by the multiple connecting portions 211 in the circumferential direction of the stator core 1 and facilitating the reduction of the space occupied by the bus bar. At the same time, the type of the lead wire 21 can be better controlled to reduce the cost and difficulty of manufacturing the stator winding 2.

[0061] According to some embodiments of the present invention, the stator core 1 includes a first arrangement area and a second arrangement area arranged circumferentially. All connection parts 211 of the stator winding 2 are centrally arranged in the first arrangement area, and the central angle corresponding to the first arrangement area is not greater than 90°. That is to say, the central angle of the arc (the two ends of the arc are two connection parts 211 on the relatively two side edges in the circumferential direction of the stator core 1, and the center of the arc is located on the central axis of the stator core 1) formed by a plurality of connection parts 211 arranged in an arc shape along the circumferential direction of the stator core 1 is not greater than 90°. It can be understood that the larger the central angle of the arc formed by sequentially connecting a plurality of connection parts 211, the more space the plurality of connection parts 211 occupy in the circumferential direction of the stator core 1. Therefore, by controlling the central angle of the arc formed by sequentially connecting a plurality of connection parts 211 within a range not greater than 90°, the space occupied by the plurality of connection parts 211 in the circumferential direction of the stator core 1 can be better controlled, which is beneficial to reducing the space occupied by the bus bar. For example, the central angle of the arc formed by sequentially connecting a plurality of connection parts 211 can be 90°, 89°, 88°, 87°, 86°, 85°, etc.

[0062] According to some embodiments of the present invention, each stator slot 11 has multiple layers of slot layers 111 arranged radially along the stator core 1, and multiple lead wires 21 are all located in the outermost layer of slot layer 111. It should be noted that the slot layer 111 in the stator slot 11 is a virtual concept. The slot layer 111 is formed due to the laminated part of the stator winding 2 passing through the stator slot 11, and the number of layers M of the slot layer 111 satisfies: M≥4 and M is an even number.

[0063] Among them, the outermost layer of slot layer 111 here refers to the one closest to the outer peripheral wall of the stator core 1 among the multiple slot layers 111 in the radial direction of the stator. And it can be understood that in the motor structure, the rotor passes through the stator core 1. By arranging the lead wire 21 in the outermost layer of slot layer 111, the distance between the lead wire 21 and the rotor can be better increased, so as to avoid the lead wire 21 interfering with the operation of the rotor. At the same time, sufficient space can be provided for the routing of the lead wire 21, so as to reasonably plan and design the position of the connection part 211 of the lead wire 21, so that the connection part 211 connecting the lead wire 21 and the bus bar can be kept centrally arranged, and further the space occupied by the multiple connection parts 211 in the circumferential direction of the stator core 1 can be reduced, so as to reduce the space occupied by the bus bar in the circumferential direction of the stator core 1. Therefore, by arranging the lead wire 21 in the outermost layer of slot layer 111, the risk of the lead wire 21 contacting and interfering with the rotor can be avoided, and at the same time, sufficient layout design space can be provided for the connection part 211, so as to reduce the design difficulty of the stator assembly 100 and be beneficial to reducing the space occupied by the bus bar, making the motor structure more compact.

[0064] According to some embodiments of the present invention, such asFigure 4 As shown, in the circumferential direction of the stator core 1, the distance L1 between any two adjacent connecting portions 211 satisfies: L1 ≤ 2L2 with respect to the stator tooth width L2. Herein, the stator tooth width refers to the dimension of the stator tooth portion in the circumferential direction of the stator core 1, that is, the ratio of the distance between two adjacent connecting portions 211 to the stator tooth width is controlled within a range not greater than 2. It can be understood that, when the dimension of the stator tooth width is fixed, the larger the ratio of L1 to L2, the greater the distance between two adjacent connecting portions 211, the larger the area occupied by multiple connecting portions 211 in the circumferential direction of the stator core 1, and thus the larger the space that the bus bar needs to cover. Therefore, by controlling the ratio of the distance between two adjacent connecting portions 211 to the stator tooth width within a range not greater than 2, the space occupied by multiple connecting portions 211 in the circumferential direction of the stator core 1 can be well controlled, which is beneficial to reducing the space occupied by the bus bar.

[0065] According to some embodiments of the present invention, in the circumferential direction of the stator core 1, the central angle of the line connecting any two adjacent connecting portions 211 is the same as the central angle of the stator teeth of the stator core 1. Thus, while controlling the distance between two adjacent connecting portions 211 to reduce the space occupied by the bus bar, the situation that the distance between two adjacent connecting portions 211 is too close can be avoided, thereby avoiding the risk of contact between connecting portions 211 of different phases due to the too-close distance between two adjacent connecting portions 211, and at the same time avoiding the increase in the winding difficulty caused by too-small gaps, so as to reduce the assembly difficulty of the stator winding 2.

[0066] According to some embodiments of the present invention, in the axial direction of the stator core 1, the stator winding 2 has a crown end 20a and a welding end 20b located on opposite sides of the stator core 1, and the connecting portion 211 is located on the crown end 20a side. That is to say, the lead wire 21 exits from the side of the stator slot 11 close to the crown end 20a, and the connection position between the stator winding 2 and the bus bar is located on the crown end 20a side. Herein, since the lead wire 21 is located on the crown end 20a side, the influence of the lead wire 21 exiting from the welding end 20b side on the structure of the welding end 20b can be avoided, thereby better simplifying the structure of the welding end 20b, reducing the design difficulty of the welding end 20b, being beneficial to reducing the design and processing difficulties of the stator assembly 100, and improving the production efficiency of the stator assembly 100.

[0067] According to some embodiments of the present invention, as Figures 8 - 11As shown, each stator slot 11 has multiple slot layers 111 arranged radially along the stator core 1. There are M layers of slot layers 111. The stator winding 2 includes three-phase windings. Each phase winding includes multiple parallel winding branches. Each winding branch includes multiple first coil groups and multiple second coil groups. The multiple first coil groups and multiple second coil groups are alternately arranged and connected along the circumferential direction of the stator core 1. The first coil group includes multiple U-shaped coils arranged radially along the stator core 1 from the second layer to the M-1 layer and connected end to end in sequence. The second coil group includes multiple U-shaped coils arranged radially along the stator core from the first layer to the M layer and connected end to end in sequence. In the circumferential direction of the stator core, one end of the second coil group is connected to the adjacent first coil group through the U-shaped coil located in the first layer slot layer 111, and the other end of the second coil group is connected to the adjacent first coil group on the other side through the U-shaped coil located in the M layer slot layer 111.

[0068] That is to say, after the multiple U-shaped coils of the first coil group are connected end to end in sequence along the radial direction of the stator core 1, they are then connected in series with the adjacent second coil group. And, after the multiple U-shaped coils of the second coil group are connected end to end in sequence along the radial direction of the stator core 1, they are then connected in series with the adjacent other first coil group. Thus, through the sequential series connection of multiple first coil groups and second coil groups, a stacked and series-connected winding branch can be formed, so that the stator winding 2 is formed into a lap winding. Thereby, the number of outgoing lines of the stator winding 2 can be preferably reduced, so that the space occupied by additional connection wires due to excessive number of outgoing lines can be reduced, and at the same time, it is convenient to concentrate the positions of the lead-out wires 21 of the three-phase windings, so as to reduce the space occupied by multiple lead-out wires 21 and busbars arranged in the circumferential direction of the stator core 1, and the structure is compact.

[0069] According to some embodiments of the present invention, on the same winding branch, the U-shaped coils arranged in the first layer and the M layer slot layers 111 are arranged with cross-wiring within the same layer, and the coils arranged in the second layer to the M-1 layer slot layers 111 are arranged with cross-wiring between two adjacent slot layers 111 of different stator slots 11. That is, the two ends of the U-shaped coil arranged in the first layer are respectively located in the first layer slot layers 111 of different stator slots 11, the two ends of the U-shaped coil arranged in the M layer are respectively located in the M layer slot layers 111 of different stator slots 11, one end of the U-shaped coil located between the first layer and the M layer slot layers 111 is located in the i-th layer, and the other end of the U-shaped coil located between the first layer and the M layer slot layers 111 is located in the i+1-th layer. Thereby, the sequential series connection of the first coil group and the second coil group along the circumferential direction of the stator core 1 can be preferably ensured, so that the lead-out wires 21 at both ends of each winding branch can be closer, and the space occupied by the busbar arranged in the circumferential direction of the stator core 1 can be reduced by concentrating the connection part 211.

[0070] Specifically, each winding branch includes two lead-out wires 21 located at both ends of the winding branch, and a plurality of first coil groups and a plurality of second coil groups connected between the two lead-out wires 21. One lead-out wire 21 serves as the input end, and the other lead-out wire 21 serves as the output end.

[0071] According to some embodiments of the present invention, the U-shaped coil has a crown portion 221, two second slot interiors 222, and two third pins 223. The two third pins 223 are respectively connected to both ends of the crown portion 221 through the two second slot interiors 222. The second slot interior 222 is disposed in the stator slot 11. The U-shaped coil includes a first U-shaped coil and a second U-shaped coil. Along the circumferential direction of the stator core 1, the two third pins 223 of the first U-shaped coil are twisted in a direction approaching each other, and the two third pins 223 of the second U-shaped coil are twisted in the same direction. The first coil group includes a plurality of first U-shaped coils, the second coil group includes a plurality of first U-shaped coils and two second U-shaped coils. The first U-shaped coil is disposed in the second layer to the (M - 1)-th layer of slot layers 111, and the second U-shaped coil is disposed in the first layer and the M-th layer of slot layers 111.

[0072] That is to say, the first U-shaped coil is disposed in the second layer to the (M - 1)-th layer of slot layers 111. Since the two third pins 223 of the first U-shaped coil are twisted in a direction approaching each other, the distance between the two third pins 223 can be shortened, so as to facilitate folding back the third pin 223 at the output end of the first U-shaped coil to the third pin 223 at the input end, which is convenient for realizing the overlapping winding of the winding branch. The second U-shaped coil can be used in the first layer of slot layers 111, and at the same time, the second U-shaped coil can also be used in the M-th layer of slot layers 111. Through the two third pins 223 of the second U-shaped coil, it is convenient to achieve a long-distance span in the circumferential direction of the stator core 1, so as to facilitate the sequential connection of the first coil group and the second coil group along the circumferential direction of the stator core 1. Thus, the wire type required for the stator winding 2 can be preferably reduced, thereby reducing the cost and difficulty of manufacturing the stator winding 2.

[0073] According to some embodiments of the present invention, the first U-shaped coil includes a first coil 22a and a second coil 22b with different spans. The second U-shaped coil includes a third coil 22c and a fourth coil 22d with different spans. The spans of the first coil 22a and the third coil 22c are the same, and the spans of the second coil 22b and the fourth coil 22d are the same. In the same phase winding, in the circumferential direction of the stator core 1, the two second slot interiors 222 of the second coil 22b in one winding branch are respectively located on opposite sides of the corresponding first coil 22a in the remaining winding branches. The two second slot interiors 222 of the fourth coil 22d in one winding branch are respectively located on opposite sides of the corresponding third coil 22c in the remaining winding branches. That is to say, the span of the second coil 22b is greater than the span of the first coil 22a, and the span of the fourth coil 22d is greater than the span of the third coil 22c. Thus, the crown portion 221 of the second coil 22b can be arranged using the space above the crown portion 221 of the first coil 22a. At the same time, the crown portion 221 of the fourth coil 22d can be arranged using the space above the crown portion 221 of the third coil 22c, which can reduce the winding arrangement difficulty of multiple winding branches in each phase winding. At the same time, the arrangement logic of the stator winding 2 at the crown end 20a can be simplified to reduce the manufacturing difficulty of the stator winding 2.

[0074] According to some embodiments of the present invention, as Figures 12 - 14 shown, the stator winding 2 includes a plurality of U-shaped coils. The U-shaped coil includes a crown portion 221. The crown portion 221 includes a first torsion portion 2211, a second torsion portion 2212, and a bending connection portion 2213 connected between the first torsion portion 2211 and the second torsion portion 2212. In the direction from the central axis of the stator core 1 towards the outer peripheral side of the stator core 1, the bending direction of the bending connection portion 2213 of the U-shaped coils located in the first layer and the Mth layer is the same as the bending direction of the bending connection portion 2213 of the U-shaped coils located in the second layer to the M - 1th layer. It can be understood that by providing the bending connection portion 2213 on the crown portion 221, it is convenient for the stator winding 2 to route between adjacent two-layer slot layers 111 and avoid other coils. Therefore, by setting the bending directions of the bending connection portions 2213 to be the same, interference between two adjacent crown portions 221 in the radial direction of the stator core 1 can be avoided, and at the same time, the distance between two adjacent crown portions 221 in the radial direction of the stator core 1 can be preferably reduced, so that the size of the crown end 20a in the radial direction can be reduced to reduce the space occupied by the crown end 20a.

[0075] According to some embodiments of the present invention, as Figure 15 and Figure 16As shown, in the axial direction of the stator core 1, the stator winding 2 has a crown end 20a and a welding end 20b located on opposite sides of the stator core 1. The welding end 20b includes multiple layers of pin groups arranged radially along the stator core 1. Each layer of pin groups includes multiple pins 20b1 arranged circumferentially along the stator core 1. The twisting directions of adjacent layers of pins 20b1 are opposite in the circumferential direction of the stator core 1. For example, if the pins 20b1 of the first layer are twisted in the clockwise direction, the pins 20b1 of the second layer are twisted in the counterclockwise direction, the pins 20b1 of the third layer are twisted in the clockwise direction, the pins 20b1 of the fourth layer are twisted in the counterclockwise direction, and so on. Thus, the connection structure between adjacent layers of pins 20b1 can be better unified to reduce the design and assembly difficulty of the stator winding 2. It can be understood that the multiple pins 20b1 include the second pins 214 of the lead wires and the third pins 223 of the U-shaped coils.

[0076] In some embodiments, the stator assembly 100 has a 72-slot 8-pole 6-layer 3-winding-branch winding arrangement, that is, the stator slots 11 have 72, the number of pole pairs is 4, the slot layers 111 are provided with six layers, each phase winding has three winding branches, and the innermost layer among the multiple slot layers 111 is the first layer, and the outermost layer is the sixth layer.

[0077] At the crown end 20a, in the slot layer 111, the first layer and the Mth layer, two third coils 22c and one fourth coil 22d form a group, occupying six stator slots 11. The span of the third coil 22c is 8, and the span of the fourth coil 22d is 11. In the slot layers 111 from the second layer to the M - 1th layer, two first coils 22a and one second coil 22b form a group, occupying six stator slots 11. The span of the first coil 22a is 8, and the span of the second coil 22b is 11. It should be noted that this is the winding method of one of the phase windings, and the other two phases are offset by N / 3P stator slots 11, where N is the number of stator slots 11 and P is the number of pole pairs.

[0078] At the welding end 20b, the pins 20b1 of the first-layer slot layer 111 are twisted clockwise by N / 4P, the pins 20b1 of the second-layer slot layer 111 are twisted counterclockwise by N / 4P, the pins 20b1 of the third-layer slot layer 111 are rotated clockwise by N / 4P, the pins 20b1 of the fourth-layer slot layer 111 are rotated counterclockwise by N / 4P, the pins 20b1 of the fifth-layer slot layer 111 are rotated clockwise by N / 4P, and the pins 20b1 of the sixth-layer slot layer 111 are rotated counterclockwise by N / 4P. Among them, the pins 20b1 of the first layer are butt-welded to the pins 20b1 of the second layer, the pins 20b1 of the third layer are butt-welded to the pins 20b1 of the fourth layer, and the pins 20b1 of the fifth layer and the pins 20b1 of the sixth layer are butt-welded. The welding span satisfies N / 2P, that is, nine stator slots 11.

[0079] Specifically, let a, b, c, d, e, and f represent the first layer, the second layer, the third layer, the fourth layer, the fifth layer, and the sixth layer of the slot layer 111 respectively. Taking the winding of phase U as an example, the winding path of the first winding branch of the phase U winding is as follows: 1f enters from the crown end 20a:

[0080] -1f - 10e - 2d - 11c - 3b - 12a - 20a - 11b - 19c - 10d - 21e - 12f - 20f - 29e - 21d - 30c - 19b - 28a - 39a - 30b - 38c - 29d - 37e - 28f - 39f - 48e - 37d - 46c - 38b - 47a - 55a - 46b - 57c - 48d - 56e - 47f - 55f - 64e - 56d - 55c - 57b - 66a - 2a - 65b - 1c - 64d - 3e - 66f - out.

[0081] The winding path of the second winding branch of the phase U winding is as follows: 2f enters from the crown end 20a:

[0082] -2f - 11e - 3d - 12c - 1b - 10a - 21a - 12b - 20c - 11d - 19e - 10f - 21f - 30e - 19d - 28c - 20b - 29a - 37a - 28b - 39c - 30d - 38b - 29f - 37f - 46e - 38d - 47c - 39b - 48a - 56a - 47b - 55c - 56d - 57e - 48f - 56f - 65e - 57d - 66c - 55b - 64a - 3a - 66b - 2c - 65d - 1e - 64f - out.

[0083] The winding path of the third winding branch of the phase U winding is as follows: 3f enters from the crown end 20a:

[0084] -3f - 12e - 1d - 10c - 2b - 11a - 7a - 10b - 21c - 12d - 20e - 11f - 19f - 28e - 20d - 29c - 21b - 30a - 38a - 20b - 37c - 22d - 39e - 30f - 38f - 47e - 39d - 48c - 37b - 46a - 57a - 48b - 56c - 47d - 55e - 46f - 57f - 66e - 55d - 64c - 56b - 65a - 1a - 64b - 3c - 66d - 2e - 65f - out.

[0085] It should be noted that the three winding branches of the V-phase winding can be wound with a clockwise offset of N / 3P around the three winding branches of the U-phase winding, where N is the number of stator slots 11 and P is the number of pole pairs, that is, six stator slots 11. The three winding branches of the W-phase winding can continue to be wound with a clockwise offset of the same six stator slots 11 based on the three winding branches of the V-phase winding. Of course, it can also be that the three winding branches of the V-phase winding are wound with a counterclockwise offset of six stator slots 11 based on the three winding branches of the U-phase winding, and the three winding branches of the W-phase winding can continue to be wound with a counterclockwise offset of the same six stator slots 11 based on the three winding branches of the V-phase winding, which will not be elaborated here one by one.

[0086] Next, the motor according to the embodiment of the second aspect of the present invention will be described with reference to the accompanying drawings.

[0087] The motor according to the embodiment of the second aspect of the present invention includes: a stator assembly 100.

[0088] For the motor according to the embodiment of the second aspect of the present invention, by twisting the lead wires 21 of the V-phase winding and the W-phase winding in the opposite direction to the lead wires 21 of the U-phase winding, the space occupied by the connection portion 211 of the three-phase windings in the circumferential direction of the stator core 1 can be reduced, which is convenient for reducing the size of the bus bar in the circumferential direction of the stator core 1 to reduce the occupied space of the bus bar, and the structure is compact.

[0089] Next, the vehicle according to the embodiment of the third aspect of the present invention will be described with reference to the accompanying drawings.

[0090] The vehicle according to the embodiment of the third aspect of the present invention includes: a motor.

[0091] For the vehicle according to the embodiment of the third aspect of the present invention, by twisting the lead wires 21 of the V-phase winding and the W-phase winding in the opposite direction to the lead wires 21 of the U-phase winding, the space occupied by the connection portion 211 of the three-phase windings in the circumferential direction of the stator core 1 can be reduced, which is convenient for reducing the size of the bus bar in the circumferential direction of the stator core 1 to reduce the occupied space of the bus bar, and the structure is compact.

[0092] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0093] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0094] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stator assembly, characterized in that, Comprising: A stator core having a plurality of stator slots arranged at circumferential intervals along the stator core; A stator winding wound in the plurality of stator slots. The stator winding is a lap winding and includes three-phase windings. Each winding branch of each phase winding includes two lead-out wires at both ends. The lead-out wires have connection portions adapted to be connected to a bus bar. In one winding branch, the number of stator slots by which the lead-out wire at the input end is offset relative to the lead-out wire at the output end is N / 2P. The three-phase windings are a U-phase winding, a V-phase winding, and a W-phase winding respectively. The number of stator slots by which the V-phase winding is offset relative to the U-phase winding and the number of stator slots by which the W-phase winding is offset relative to the V-phase winding are N / 3P. N is the number of stator slots, and P is the number of pole pairs. Wherein, the direction in which the V-phase winding is offset relative to the U-phase winding in the circumferential direction of the stator core is a first direction. In the axial direction of the stator core towards the direction close to the connection portion, the lead-out wire of the U-phase winding is twisted along the first direction, and the lead-out wires of the V-phase winding and the W-phase winding are twisted along a second direction so that the connection portions of the three-phase windings are continuously arranged. The second direction is opposite to the first direction.

2. The stator assembly according to claim 1, wherein, The two lead-out wires of the U-phase winding are a U-phase incoming wire and a U-phase outgoing wire respectively. The two lead-out wires of the V-phase winding are a V-phase incoming wire and a V-phase outgoing wire respectively. The two lead-out wires of the W-phase winding are a W-phase incoming wire and a W-phase outgoing wire respectively. In the circumferential direction of the stator core, the connection portions of the V-phase incoming wire, the W-phase incoming wire, the U-phase incoming wire, the V-phase outgoing wire, the W-phase outgoing wire, and the U-phase outgoing wire are arranged in sequence.

3. The stator assembly according to claim 2, wherein, The lead-out wire includes a first inner slot portion and a first pin. The first inner slot portion is inserted into the stator slot. The first pin is connected to the end of the first inner slot portion and is twisted relative to the first inner slot portion along the circumferential direction of the stator core. The connection portion is formed on the first pin and extends along the axial direction of the stator core. The number of stator slots corresponding to the span by which the connection portion is deflected relative to the first inner slot portion is N / 4P.

4. The stator assembly according to claim 2, wherein The lead-out wire is an I-shaped coil. The I-shaped coil includes a first inner slot portion, a first pin, and a second pin. The first inner slot portion is inserted into the stator slot. The first pin and the second pin are respectively connected to both ends of the first inner slot portion. The connection portion is formed on one of the first pin and the second pin. The I-shaped coil includes a first I-shaped coil and a second I-shaped coil. Along the circumferential direction of the stator core, the first pin and the second pin of the first I-shaped coil are twisted in the same direction relative to the first inner slot portion, and the first pin and the second pin of the second I-shaped coil are twisted in opposite directions relative to the first inner slot portion. The U-phase incoming wire and the U-phase outgoing wire are the first I-shaped coil, and the V-phase incoming wire, the V-phase outgoing wire, the W-phase incoming wire, and the W-phase outgoing wire are the second I-shaped coils.

5. The stator assembly according to claim 1, characterized in that, The stator core includes a first arrangement region and a second arrangement region arranged circumferentially. All the connection parts of the stator winding are concentrated in the first arrangement region, and the central angle corresponding to the first arrangement region is not greater than 90°.

6. The stator assembly according to claim 1, wherein Each of the stator slots has multiple slot layers arranged radially along the stator core, and multiple lead-out wires are all located in the outermost slot layer; and / or, axially of the stator core, the stator winding has a crown end and a welding end located on opposite sides of the stator core, and the connection part is located on the side of the crown end.

7. The stator assembly according to claim 1, characterized in that, Each of the stator slots has multiple slot layers arranged radially along the stator core. There are M layers of the slot layers. Each phase of the winding includes multiple parallel winding branches. Each winding branch includes multiple first coil groups and multiple second coil groups. The multiple first coil groups and the multiple second coil groups are alternately arranged and connected circumferentially along the stator core. The first coil group includes multiple U-shaped coils arranged radially along the stator core in the second layer to the (M - 1)th layer of the slot layers and connected end to end in sequence. The second coil group includes multiple U-shaped coils arranged radially along the stator core in the first layer to the Mth layer of the slot layers and connected end to end in sequence. Circumferentially along the stator core, one end of the second coil group is connected to the adjacent first coil group on one side through the U-shaped coil located in the first layer of the slot layer, and the other end of the second coil group is connected to the adjacent first coil group on the other side through the U-shaped coil located in the Mth layer of the slot layer.

8. The stator assembly according to claim 7, wherein, On the same winding branch, the coils arranged in the first layer and the Mth layer of the slot layers are set to cross wires within the same layer, and the coils arranged in the second layer to the (M - 1)th layer of the slot layers are set to cross wires between two adjacent slot layers of different stator slots.

9. The stator assembly according to claim 8, characterized in that, The U-shaped coil has a crown part, two second slot interiors, and two third pins. The two third pins are respectively connected to the two ends of the crown part through the two second slot interiors. The second slot interior penetrates through the stator slot. The U-shaped coil includes a first U-shaped coil and a second U-shaped coil. Circumferentially along the stator core, the two third pins of the first U-shaped coil are twisted in a direction close to each other, and the two third pins of the second U-shaped coil are twisted in the same direction. The first coil group includes multiple first U-shaped coils, the second coil group includes multiple first U-shaped coils and two second U-shaped coils. The first U-shaped coil is arranged in the second layer to the (M - 1)th layer of the slot layers, and the second U-shaped coil is arranged in the first layer and the Mth layer of the slot layers.

10. The stator assembly according to claim 9, wherein The first U-shaped coil includes a first coil and a second coil with different spans, the second U-shaped coil includes a third coil and a fourth coil with different spans, the spans of the first coil and the third coil are the same, the spans of the second coil and the fourth coil are the same. Within the same-phase winding, in the circumferential direction of the stator core, inside two second slots of the second coil in one winding branch, they are respectively located on opposite sides of the corresponding first coil in the remaining winding branches; inside two second slots of the fourth coil in one winding branch, they are respectively located on opposite sides of the corresponding third coil in the remaining winding branches.

11. The stator assembly according to claim 8, wherein, The stator winding includes a plurality of U-shaped coils. The U-shaped coil includes a crown portion. The crown portion includes a first torsion portion, a second torsion portion, and a bending connection portion connected between the first torsion portion and the second torsion portion. In the direction from the central axis of the stator core towards the outer peripheral side of the stator core, the bending directions of the bending connection portions of the U-shaped coils located in the first layer and the Mth layer are the same as those of the bending connection portions of the U-shaped coils located in the second layer to the (M - 1)th layer.

12. A motor, characterized in that, Comprising: The stator assembly according to any one of claims 1-11.

13. A vehicle, characterized in that, Comprising: The motor according to claim 12.

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