A motor winding and stator assembly

Abstract

The application provides a motor winding and a stator assembly, wherein the motor winding comprises a multi-phase winding, each phase of the winding comprises a plurality of branches, the branches comprise a plurality of lap winding coil groups, the lap winding coil groups comprise a plurality of U-shaped coils, the span of the U-shaped coils is y+1 and / or y-1, y represents the pole pitch of the motor, and wave winding coils whose span is y+1 or y-1 are arranged in a single branch and have the same span; the wave winding coils are connected in series between adjacent winding coil groups, one end of the wave winding coil is connected to the innermost U-shaped coil of one lap winding coil group, and the other end of the wave winding coil is connected to the outermost U-shaped coil of the adjacent lap winding coil group. The application can effectively improve the problem of inconsistent slot pitch of the motor winding at the welding end and low reliability of the motor.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric machines, in particular to an electric machine winding and a stator assembly. BACKGROUND

[0002] The driving motor of a new energy vehicle requires light weight, high power density and high efficiency, and a flat wire winding is usually used. In the case of a constant motor slot, the DC resistance of the motor winding can be reduced and the copper loss of the motor can be reduced by increasing the slot fill factor of the motor, and the efficiency of the motor can be improved. In the connection process of the existing motor winding, the twisted slot pitch at the welding end of the winding is inconsistent, resulting in complex manufacturing process and low processing efficiency. At the same time, there is a bridge line, which increases the welding point, resulting in low reliability of the motor and high production cost. SUMMARY

[0003] In view of the above shortcomings of the prior art, the purpose of the present application is to provide an electric machine winding and a stator assembly to improve the problem of inconsistent twisted slot pitch at the welding end of the winding of the electric machine and low reliability of the electric machine.

[0004] To achieve the above object and other related objects, the present application provides an electric machine winding, comprising:

[0005] A multi-phase winding, each phase of the winding comprising a plurality of branches, wherein the branches comprise:

[0006] A plurality of lap winding coil groups, the lap winding coil groups comprising a plurality of U-shaped coils, wherein the span of the U-shaped coils is y+1 and / or y-1, y representing the pole pitch of the electric machine; and

[0007] A wave winding, the span of which is y+1 or y-1, and the span of the wave winding in a single branch is the same;

[0008] Wherein, adjacent winding coil groups are connected in series through the wave winding, one end of the wave winding is connected to the innermost U-shaped coil of the lap winding coil group, and the other end of the wave winding is connected to the outermost U-shaped coil of the adjacent lap winding coil group.

[0009] In an embodiment of the present application, in a single lap winding coil group, a plurality of U-shaped coils are connected in series, and the span of the U-shaped coils is alternately arranged as y+1 and y-1.

[0010] In an embodiment of the present application, the branches are arranged in parallel, and the number of branches is a positive integer greater than or equal to 4.

[0011] The present application also provides a stator assembly, comprising:

[0012] The iron core is provided with multiple grooves, which are distributed along the circumference of the iron core.

[0013] A multi-phase winding, wherein the winding is wound on the iron core, and each phase of the winding includes multiple branches, wherein the branches include:

[0014] Multiple lapped coil groups, each comprising multiple U-shaped coils, wherein the span of the U-shaped coils is y+1 and / or y-1, where y represents the pole pitch of the motor; and

[0015] A wave-wound coil with a span of y+1 or y-1, and the same span of the wave-wound coil within a single branch;

[0016] The adjacent winding coil groups are connected in series through the wave-wound coil, and one end of the wave-wound coil is connected to the innermost U-shaped coil of the lapped winding coil group, while the other end of the wave-wound coil is connected to the outermost U-shaped coil of the adjacent lapped winding coil group.

[0017] In one embodiment of the present invention, the iron core has N slot layers in its groove, and N is an even number.

[0018] In one embodiment of the invention, within a single lapped coil group, the U-shaped coil is located between the second slot layer and the (N-1)th slot layer.

[0019] In one embodiment of the present invention, the U-shaped coil includes:

[0020] Two straight sections; and

[0021] The connecting part is the part that connects the two straight parts;

[0022] In the radial direction of the motor core, the two straight sections located within a single U-shaped coil are separated by one layer.

[0023] In one embodiment of the present invention, one end of the wave-wound coil is located in the first slot layer of the iron core, and the other end of the wave-wound coil is located in the Nth slot layer of the iron core.

[0024] In one embodiment of the present invention, an inlet coil is further included, which is connected in series with the frontmost lapped coil group in the branch, wherein the inlet coil is a wave-wound coil.

[0025] In summary, this invention discloses a motor winding and stator assembly that ensures consistent twisted slot pitch at the welding ends of the motor winding branches. This reduces the complexity of the manufacturing process, improves processing efficiency, and lowers production costs. Furthermore, it eliminates the need for bridging wires, simplifying the winding connection method and thus streamlining the process and improving processing efficiency. This further addresses the issues of inconsistent twisted slot pitch at the welding ends of the motor windings and low motor reliability. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a stator assembly according to one embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of one phase winding of the motor according to an embodiment of the present invention;

[0029] Figure 3 For the present invention Figure 2 A magnified structural diagram of view A in the middle;

[0030] Figure 4 This is a schematic diagram of the structure of the stacked coil group with the wave-wound coil removed in one embodiment of the motor winding of the present invention.

[0031] Figure 5 For the present invention Figure 4 A magnified structural diagram of the C-view;

[0032] Figure 6 This is a schematic diagram of a state of the lapped coil group in one embodiment of the motor winding of the present invention.

[0033] Figure 7 This is a schematic diagram of another state of the lapped coil group in one embodiment of the motor winding of the present invention.

[0034] Figure 8 This is a schematic diagram of a state of the U-shaped coil in the lapped coil group of a motor phase winding of the present invention in one embodiment;

[0035] Figure 9 This is a schematic diagram of another state of the U-shaped coil in the lapped coil group of a motor phase winding of the present invention in one embodiment;

[0036] Figure 10This is a schematic diagram of the structure of a wave-wound coil with the overlapping coil group removed in one embodiment of the motor winding of the present invention.

[0037] Figure 11 For the present invention Figure 10 A magnified structural diagram of view B in the middle;

[0038] Figure 12 This is a schematic diagram of the structure of a state of the wave-wound coil in one embodiment of the motor winding of the present invention.

[0039] Figure 13 This is a schematic diagram of another state of the wave-wound coil in one embodiment of the motor winding of the present invention.

[0040] Figure 14 This is a schematic diagram of the structure of one branch of a motor phase winding in one embodiment of the present invention.

[0041] Figure 15 This is a schematic diagram of another state of a branch of a short-pitch wave winding coil in one embodiment of the motor winding of the present invention.

[0042] Figure 16 This is a schematic diagram of the A-phase winding unfolded in one embodiment of the stator assembly of the present invention;

[0043] Figure 17 This is a schematic diagram of the connection structure of the first branch and the second branch of a motor phase winding in one embodiment of the present invention.

[0044] Figure 18 This is a schematic diagram of the connection structure of the third and fourth branches of a motor phase winding in one embodiment of the present invention;

[0045] Figure 19 This is a schematic diagram of the structure of multiple branches connected in parallel in one embodiment of the motor winding of the present invention.

[0046] Component designation explanation

[0047] 100. Iron core; 110. Cable tray;

[0048] 200. Winding; 210. Lap-wound coil group; 220. Wave-wound coil; 221. Long-pitch wave-wound coil; 222. Short-pitch wave-wound coil;

[0049] 230. U-shaped coil; 231. Straight section; 232. Connecting section;

[0050] 300. Welding section; 321. Twisting section. Detailed Implementation

[0051] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0052] Please see Figures 1 to 19 As shown in the accompanying drawings. It should be noted that the structures, proportions, sizes, etc., depicted in the drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0053] Please see Figure 1 As shown, this invention provides a stator assembly, in which a winding 200 and an iron core 100 are disposed, wherein the winding 200 is wound on the iron core 100. The number of slots per pole per phase of the motor can be defined as q, and q = Q / (2mp). Here, Q represents the number of slots in the motor, p represents the number of pole pairs in the motor, y represents the pole pitch of the motor, and m represents the number of phases in the motor. The pole pitch represents the distance between two adjacent magnetic poles on the armature surface of the motor, and the pole pitch can be represented by the number of slots in the motor, and y = Q / (2p).

[0054] Please see Figure 1As shown, in one embodiment, the stator assembly includes a core 100 and a winding 200. Specifically, the core 100 is cylindrical and has multiple slots 110. These slots 110 are distributed circumferentially along the core 100 and are continuous throughout the core. The winding 200 can be wound within these slots. It should be noted that, along the circumferential direction of the core 100, the slots 110 can be sequentially defined as slot 1, slot 2, ..., slot i, ..., slot N, ... Each slot 110 contains r slot layers, which can be defined as layer 1, layer 2, ..., layer j, ..., layer r, respectively, along the radial direction of the core 100 from the outside to the inside. It should be noted that the total number of slot layers within the wire groove 110 is an even number. Therefore, multiple conductors can be installed within a single wire groove 110, with each conductor positioned in a different slot layer. Conductors located in different slot layers within different wire grooves 110 can be named using the format K(L). Here, K represents the position of the conductor within the wire groove 110, and L represents the number of slot layers the conductor occupies within the wire groove 110.

[0055] Please see Figures 2-5 As shown, in one embodiment, the motor is a multi-phase motor, and the windings 200 within the motor can be multi-phase windings. Each phase winding includes multiple branches, and these branches are connected in parallel. Specifically, for the motor windings 200, the number of branches in each phase winding is a positive integer greater than or equal to 4. For each branch, it can include multiple lapped coil groups 210 and wave-wound coils 220. The lapped coil groups 210 are wound on the iron core 100 of the stator assembly, and the coils are located within the slots 110. The lapped coil groups 210 are circumferentially distributed on the iron core 100, and the wave-wound coils 220 are connected between adjacent lapped coil groups 210 to achieve series connection between the multiple lapped coil groups 210. Along the circumference of the iron core 100, the lapped coil group 210 can be defined sequentially as the first lapped coil group, the second lapped coil group, ..., the mth lapped coil group, ..., the nth lapped coil group.

[0056] Please see Figures 4-5As shown, in one embodiment, the lapped coil group 210 may include a plurality of U-shaped coils 230, which are connected in series. Specifically, each U-shaped coil 230 may include two straight sections 231 and a connecting section 232, wherein the connecting section 232 connects the two straight sections 231. It should be noted that, in the radial direction of the motor core 100, the slot layer positions of the two straight sections 231 within a single U-shaped coil 230 in the slot 110 differ by one layer. For example, if one straight section 231 of the U-shaped coil 230 is in the second slot layer of the slot 110, then the other straight section 231 of the U-shaped coil 230 is in the third slot layer of the slot 110. For a single lapped coil group 210, the slot layer position of the U-shaped coils 230 included in the slot 110 is always between the second and (r-1)th layers. For example, within a single lapped coil group 210, along the radial direction from the inside to the outside of the core 100, U-shaped coils 230 can be sequentially defined as the first U-shaped coil, the second U-shaped coil, ..., the y-th U-shaped coil. Therefore, a straight portion 231 within the first U-shaped coil can be located in the second layer of the slot 110, and another straight portion within the first U-shaped coil can be located in the third layer; and a straight portion 231 within the y-th U-shaped coil can be located in the (r-1)-th layer of the slot 110, and another straight portion within the y-th U-shaped coil can be located in the (r-2)-th layer.

[0057] Please see Figure 2 , Figure 4 , Figure 10 and Figure 11 As shown, in one embodiment, two interconnected U-shaped coils 230 can be connected via a welding section 300. Specifically, a twisted section 321 can be connected to the U-shaped coil 230, and the twisted section 321 is located on the straight section 231. The welding section 300 can be provided on the twisted section 321, and the two interconnected twisted sections 321 are welded together via the welding section 300. Therefore, for two straight sections 231 that need to be connected, two twisted sections 321 located on corresponding straight sections 231 can be connected. The connection between adjacent U-shaped coils is achieved by welding the two twisted sections 321 at the welding section 300.

[0058] Please see Figures 2-9As shown, in one embodiment, within a single lapped coil group 210, multiple U-shaped coils 230 are connected in series and wound alternately. Specifically, it is permissible to define two straight sections 231 of the U-shaped coil 230 as a first straight section and a second straight section, respectively, in a counterclockwise direction. The span between the first and second straight sections is y+1 or y-1, and the first and second straight sections differ by one side of a slot layer. Adjacent U-shaped coils are connected end-to-end. For example, within a single lapped coil group 210, the second straight section of the first U-shaped coil 230 is connected to the first straight section of the second U-shaped coil 230, the second straight section of the second U-shaped coil 230 is connected to the first straight section of the third U-shaped coil 230, and so on, until the second straight section of the (y-1)th U-shaped coil 230 is connected to the first straight section of the yth U-shaped coil 230. In this configuration, for two interconnected U-shaped coils 230, the span between their interconnecting second and first straight sections is y, and the second and first straight sections differ by one slot layer. It is important to note that the U-shaped coils 230 within a single lapped coil group 210 have alternating spans of y+1 and y-1. For example, if the span of the first U-shaped coil 230 is y+1, then the span of the second U-shaped coil 230 is y-1, and the span of the third U-shaped coil 230 is y+1, and so on, until multiple U-shaped coils 230 within a single lapped coil group 210 are connected in series. Therefore, each branch of the motor includes lapped coils with various spans.

[0059] Please see Figures 10-15As shown, in one embodiment, adjacent lapped coil groups 210 can be connected by wave-wound coils 220. The span of the wave-wound coils 220 is either y+1 or y-1, and the span of the wave-wound coils 220 is the same within a single branch. For example, in a stator assembly, each phase winding includes two branches, where all wave-wound coils 220 in one branch have a span of y+1, and all wave-wound coils 220 in the other branch have a span of y-1. Specifically, the wave-wound coil 220 has the same structure as the U-shaped coil 230, including two straight sections 231 connected by a connecting section 232. A twisted section 321 is also connected to the other end of the straight section 231, and is connected to the lapped coil group 210 through the twisted section 321. It should be noted that one straight section 231 of the wave-wound coil 220 is located in the innermost slot layer of the iron core 100 slot 110, and the other straight section 231 of the wave-wound coil 220 is located in the outermost slot layer of the iron core 100 slot 110. During the connection process, the straight section 231 in the innermost (i.e., the first layer) slot layer of the wave-wound coil 220 is connected to the straight section 231 in the second layer of the lapped coil group 210, and the straight section 231 in the outermost (i.e., the rth layer) slot layer of the wave-wound coil 220 is connected to the straight section 231 in the (r-1)th layer of the adjacent lapped coil group 210. Therefore, the wave-wound coil 220 is a cross-layer coil, and the cross-layer range of the wave-wound coil 220 is from the innermost layer of the iron core 100 slot 110 to the outermost layer of the iron core 100 slot 110. Specifically, the wave-wound coil 220 may include a long-pitch wave-wound coil 221 and a short-pitch wave-wound coil 222. The span of the long-pitch wave-wound coil 221 is y+1, and the span of the short-pitch wave-wound coil 222 is y-1. It should be noted that the long-pitch wave-wound coil 221 and the short-pitch wave-wound coil 222, located under the same pole, are axially nested on the iron core 100 of the motor and are concentrically distributed.

[0060] It should be noted that, for a branch circuit, there are also an inlet coil and an outlet coil. The inlet coil facilitates current introduction, and the outlet coil facilitates current output. The inlet coil is a wave-wound coil, and it may include two straight sections 231. The span between the two straight sections 231 within the inlet coil is y+1 or y-1, and one straight section 231 is located in the outermost layer of the iron core 100 slot 110, while the other is located in the innermost layer. Furthermore, the outlet coil is a lap-wound coil, and it may include two straight sections 231. The two straight sections 231 within the outlet coil are located in adjacent slot layers within the iron core 100 slot 110. It should be noted that the outlet coil is located within the winding coil group in the branch circuit. Specifically, the coil at the end position in the nth lapped coil group of a branch can be defined as a lead-out coil, for example, the lead-out coil is the foremost or last coil in the lapped coil group of the branch. Along the radial direction of the iron core, the foremost coil represents the lapped coil at the end position near the inner circle of the iron core, and the last coil represents the lapped coil at the end position near the outer circle of the iron core.

[0061] Understandably, for the input coil, the end of its corresponding straight portion 231 is connected to a twisted section 321, thus allowing a connection between the input coil and the lapped coil group via the twisted section 321. Similarly, for the output coil, the end of its corresponding straight portion 231 is connected to a twisted section 321, allowing a connection between the input coil and the lapped coil group via the twisted section 321. Therefore, current is introduced through the input coil and discharged through the output coil.

[0062] In summary, in the branch of motor winding 200, adjacent lapped coil groups 210 are connected by wave-wound coils 220 to form a complete branch. Through this arrangement of windings 200, the twisted slot pitch at the welding ends of windings 200 is consistent, reducing the complexity of the manufacturing process, improving processing efficiency, and lowering production costs. Simultaneously, by eliminating the bridge wire, the wiring method of windings 200 is simplified, thereby simplifying the process and improving processing efficiency.

[0063] Please see Figures 16-19As shown, in one embodiment, the motor winding 200 may use a flat wire hairpin winding. Therefore, the winding 200 has a hairpin end (i.e., connection part 232) and a welding end (welding part 300), and the hairpin end and welding end are respectively located on both sides of the iron core 100. The explanation and description will be based on an example of a three-phase, 8-pole, 48-slot motor with 8 wires per slot. The three phases of the motor may include phase A, phase B, and phase C, and the winding methods of the coil groups of phases A, B, and C are the same. The only difference is the position of the slot 110 where the input and output ends of phases A, B, and C are located. For example, the phase A winding includes two branches, and the input ends corresponding to the two branches can be slot 48 and slot 1. The phase B winding includes two branches, and the input ends corresponding to the two branches can be slot 4 and slot 5. The C-phase winding includes two branches, and the input terminals corresponding to the two branches can be slot 8 and slot 9, but are not limited to these and can be determined according to actual needs.

[0064] Please see Figures 16-19 As shown, in one embodiment, the winding 200 includes multiple parallel branches, and the number of branches is a positive integer greater than or equal to 4. Therefore, taking a single-phase winding 200 with 4 branches as an example, the A-phase winding may include a first branch A1X1, a second branch A2X2, a third branch A3X3, and a fourth branch A4X4, where A1, A2, A3, and A4 are located at the input terminals of the winding 200. X1, X2, X3, and X4 are the output terminals of the winding 200.

[0065] Please see Figure 16 As shown, Figure 16 This is a schematic diagram of the A-phase winding. Figure 16 In the middle, from left to right, are the 1st, 2nd, 3rd, 4th, 5th, 6th, 7th and 8th floors.

[0066] Please see Figure 17 As shown, in one embodiment, the input end of the first branch A1X1 is located at position 48(1) in the slot 110 of the iron core 100. Then, the specific winding method of the first branch A1X1 of the A-phase winding may include:

[0067] A1->48(1)->7(8)->13(7)->6(6)->12(5)->7(4)->13(3)->6(2)->12(1)->19(8)->25(7)->18(6)->24(5)->19(4)->25(3)->18(2)-> 24(1)->31(8)->37(7)->30(6)->36(5)->31(4)->37(3)->30(2)->36(1)->43(8)->1(7)->42(6)->48(5)->43(4)->1(3)->42(2)->X1.

[0068] Please see Figure 17 As shown, the input terminal of the second branch A2X2 is located at position 1(1) in slot 110 of the iron core 100. Therefore, the specific winding method of the second branch A2X2 of the A-phase winding can include:

[0069] A2->1(1)->6(8)->12(7)->7(6)->13(5)->6(4)->12(3)>7(2)->13(1)->18(8)->24(7)->19(6)->25(5)->18(4)->24(3)->19(2)->25 (1)->30(8)->36(7)->31(6)->37(5)->30(4)->36(3)->31(2)->37(1)->42(8)->48(7)->43(6)->1(5)->42(4)->48(3)->43(2)->X2.

[0070] Please see Figure 18 As shown, the input terminal of the third branch A3X3 is located at position 48(8) in slot 110 of the iron core 100. Therefore, the specific winding method of the third branch A3X3 of the A-phase winding can include:

[0071] A3->48(8)->43(1)->37(2)->42(3)->36(4)->43(5)->37(6)->42(7)->36(8)->31(1)->25(2)->30(3)->24(4)->31(5)->25(6)->30( 7)->24(8)->19(1)->13(2)->18(3)->12(4)->19(5)->13(6)->18(7)->12(8)->7(1)->1(2)->6(3)->48(4)->7(5)->1(6)->6(7)->X3.

[0072] Please see Figure 18As shown, the input terminal of the fourth branch A4X4 is located at position 1(8) in slot 110 of the iron core 100. Therefore, the specific winding method of the fourth branch A4X4 of the A-phase winding can include:

[0073] A4->1(8)->42(1)->36(2)->43(3)->37(4)->42(5)->36(6)->43(7)->37(8)->30(1)->24(2)->31(3)->25(4)->30(5)->24(6)->31(7 )->25(8)->18(1)->12(2)->19(3)->13(4)->18(5)->12(6)->19(7)->13(8)->6(1)->48(2)->7(3)->1(4)->6(5)->48(6)->7(7)->X4.

[0074] Please see Figure 19 As shown, in one embodiment, in the first and fourth branches, the span of the wave-wound coils 220 used to connect adjacent lapped coil groups 210 can be a long-pitch wave-wound coil 221. And in the second and fourth branches, the span of the wave-wound coils 220 used to connect adjacent lapped coil groups 210 can be a short-pitch wave-wound coil group 222. The first, second, third, and fourth branches are interconnected to form a complete motor winding 200. Specifically, in one embodiment, each of the A-phase winding, B-phase winding, and C-phase winding has four branches, namely the first branch, second branch, third branch, and fourth branch. Taking the A-phase winding as an example, in the A-phase winding, the input terminals of the first, second, third, and fourth branches are connected, the output terminal of the first branch is connected to the output terminal of the fourth branch, and the output terminals of the second and third branches are connected. For ease of explanation, it is permissible to define the first and fourth parallel branches as the first parallel branch, and the second and third parallel branches as the second parallel branch. It is understood that in the motor winding 200, the B-phase winding and C-phase winding can also be defined with first and second parallel branches in the same way. Therefore, for the stator assembly, the output terminals of the first branches in the A-phase, B-phase, and C-phase windings are interconnected to form the first star-point line, and the output terminals of the second branches in the A-phase, B-phase, and C-phase windings are interconnected to form the second star-point line. The specific connection method of the motor windings is not limited to this and can be determined according to actual needs.

[0075] In summary, the wiring method described above ensures consistent twisted slot pitch at the welding ends of the motor windings in the branch circuits. This reduces the complexity of the manufacturing process, improves processing efficiency, and lowers production costs. Furthermore, the elimination of the bridging wire simplifies the winding connection method, thereby simplifying the process and improving processing efficiency. This further improves the issues of inconsistent twisted slot pitch at the welding ends of the motor windings and low motor reliability. Therefore, this invention effectively overcomes some practical problems in the prior art, thus possessing high utilization value and practical significance.

[0076] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A motor winding, characterized in that, include: Multiphase windings, each phase of the winding including multiple branches, the branches including: Multiple lapped coil groups, each comprising multiple U-shaped coils, wherein the span of the U-shaped coils is y+1 and / or y-1, where y represents the pole pitch of the motor; and A wave-wound coil with a span of y+1 or y-1, wherein the span of the wave-wound coil is the same within a single branch; The adjacent stacked coil groups are connected in series through the wave-wound coil, and one end of the wave-wound coil is connected to the innermost U-shaped coil of the stacked coil group, and the other end of the wave-wound coil is connected to the outermost U-shaped coil of the adjacent stacked coil group. Within a single stacked coil group, multiple U-shaped coils are connected in series, and the spans of the U-shaped coils are alternately set as y+1 and y-1.

2. The motor winding according to claim 1, characterized in that, The branches are connected in parallel, and the number of branches is a positive integer greater than or equal to 4.

3. A stator assembly, characterized in that, include: The iron core is provided with multiple grooves, which are distributed along the circumference of the iron core. Multiphase windings, wherein the windings are wound on the iron core, and each phase of the winding includes multiple branches, the branches including: Multiple lapped coil groups, each comprising multiple U-shaped coils, wherein the span of the U-shaped coils is y+1 and / or y-1, where y represents the pole pitch of the motor; and A wave-wound coil with a span of y+1 or y-1, wherein the span of the wave-wound coil is the same within a single branch; The adjacent stacked coil groups are connected in series through the wave-wound coil, and one end of the wave-wound coil is connected to the innermost U-shaped coil of the stacked coil group, while the other end of the wave-wound coil is connected to the outermost U-shaped coil of the adjacent stacked coil group. Within a single stacked coil group, multiple U-shaped coils are connected in series, and the spans of the U-shaped coils are alternately set as y+1 and y-1.

4. The stator assembly according to claim 3, characterized in that, The iron core has N slot layers in its grooves, and N is an even number.

5. The stator assembly according to claim 3, characterized in that, Within a single lapped coil group, the U-shaped coil is located between the second slot layer and the (N-1)th slot layer.

6. The stator assembly according to claim 4, characterized in that, The U-shaped coil includes: Two straight sections; and The connecting part is the part that connects the two straight parts; In the radial direction of the motor core, there is a slot layer between the two straight sections located within a single U-shaped coil.

7. The stator assembly according to claim 5, characterized in that, One end of the wave-wound coil is located in the first slot layer of the iron core, and the other end of the wave-wound coil is located in the Nth slot layer of the iron core.

8. The stator assembly according to claim 3, characterized in that, It also includes an input coil, which is connected in series with the frontmost lapped coil group in the branch, wherein the input coil is a wave-wound coil.

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