CN115173604A

CN115173604A - Motor winding and stator assembly

Info

Publication number: CN115173604A
Application number: CN202210720100.6A
Authority: CN
Inventors: 汤浩; 阮鸥; 朱殿烨; 孙新东; 张增杰; 李涛
Original assignee: Zhejiang Geely Holding Group Co Ltd; Weirui Electric Automobile Technology Ningbo Co Ltd; Zhejiang Zeekr Intelligent Technology Co Ltd
Current assignee: Zhejiang Geely Holding Group Co Ltd; Weirui Electric Automobile Technology Ningbo Co Ltd; Zhejiang Zeekr Intelligent Technology Co Ltd
Priority date: 2022-06-23
Filing date: 2022-06-23
Publication date: 2022-10-11

Abstract

The invention 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, each branch comprises a plurality of lap winding coil groups, each lap winding coil group comprises a plurality of U-shaped coils, and the span of each U-shaped coil is y +1 and/or y-1,y representing the polar distance of a motor; and a wave winding coil with a span y; the span of all the wave winding coils in each phase of winding is y, the adjacent winding coil groups are connected in series through the wave winding coils, one end of each wave winding coil is connected to the U-shaped coil on the innermost side of one lap winding coil group, and the other end of each wave winding coil is connected to the U-shaped coil on the outermost side of the adjacent lap winding coil group. The invention can effectively solve the problems of inconsistent twisting slot pitches of the winding of the motor at the welding end and low reliability of the motor.

Description

Motor winding and stator assembly

Technical Field

The invention relates to the field of motors, in particular to a motor winding and a stator assembly.

Background

The driving motor of the new energy automobile is required to be light in weight, high in power density and high in efficiency, and a flat wire winding is usually adopted. Under the condition that the motor wire slot is not changed, the full rate of the motor wire slot is improved, the direct-current resistance of a motor winding can be reduced, the copper consumption of the motor can be reduced, and the efficiency of the motor can be improved. In the connection process of the winding of the existing motor, the twisted slot pitches of the winding at the welding end are inconsistent, so that the manufacturing process is complex and the processing efficiency is low. Meanwhile, a gap bridge wire exists, welding spots are added, and therefore the motor is low in reliability and high in production cost.

Disclosure of Invention

In view of the above disadvantages of the prior art, an object of the present invention is to provide a winding and a stator assembly of a motor, so as to solve the problems of inconsistent twisted slot pitches of the winding at the welding end and low reliability of the motor.

To achieve the above and other related objects, the present invention provides a winding for a motor, comprising:

a multi-phase winding, each phase of the winding comprising a plurality of legs, wherein the legs comprise:

the motor comprises a plurality of lap winding coil groups, wherein each lap winding coil group comprises a plurality of U-shaped coils, and the span of each U-shaped coil is y +1 and/or y-1,y for representing the pole distance of the motor; and

a wave winding coil with a span y;

the span of all the wave winding coils in each phase of winding is y, the adjacent winding coil groups are connected in series through the wave winding coils, one end of each wave winding coil is connected to the U-shaped coil on the innermost side of one lap winding coil group, and the other end of each wave winding coil is connected to the U-shaped coil on the outermost side of the adjacent lap winding coil group.

In one embodiment of the invention, in a single lap winding coil group, a plurality of U-shaped coils are connected in series, and the spans of the U-shaped coils are y +1 and y-1 alternately.

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

The present invention also provides a stator assembly comprising:

the iron core is provided with a plurality of wire grooves which are distributed along the circumferential direction of the iron core;

the multi-phase winding, the winding is coiled on the iron core, every looks the winding includes many branches, wherein, the branch includes:

the motor comprises a plurality of lap winding coil groups, a plurality of motor stator coil groups and a plurality of motor stator coil groups, wherein the lap winding coil groups comprise a plurality of U-shaped coils, and the span of the U-shaped coils is y +1 and/or y-1,y for representing the pole pitch of the motor; and

a wave winding coil having a span y;

In an embodiment of the present invention, N slot layers are disposed in the slot of the iron core, and N is an even number.

In one embodiment of the invention, the U-shaped coil is positioned between the 2 nd slot layer and the N-1 st slot layer within a single lap wound coil group.

In an embodiment of the present invention, the U-shaped coil includes:

two straight line portions; and

a connecting portion connected between the two linear portions;

and in the radial direction of the motor iron core, the difference between the two straight line parts positioned in the single U-shaped coil is one layer.

In an embodiment of the present invention, one end of the wave winding coil is located in the 1 st slot layer of the iron core, and the other end of the wave winding coil is located in the nth slot layer of the iron core.

In an embodiment of the present invention, the winding device further includes a leading end coil connected in series with the lap winding coil group at the foremost end in the branch, wherein the leading end coil is a wave winding coil.

In summary, the present invention discloses a motor winding and a stator assembly, so that the twisted slot pitches of the welding ends of the windings are consistent in the branches of the motor winding. The complexity of the manufacturing process can be reduced, the processing efficiency is improved, and the production cost is reduced. Meanwhile, a gap bridge wire is eliminated, and the wiring mode of the winding is simplified, so that the process is simplified, and the working efficiency is improved. And then improve the winding of motor and at the inconsistent and low problem of motor reliability of the distortion slot pitch of weld end.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a stator assembly according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a phase winding of the motor according to an embodiment of the present invention;

FIG. 3 is an enlarged view of view A of FIG. 2;

FIG. 4 is a schematic diagram of a lap winding coil assembly with wave winding coils removed for one phase winding of the motor according to an embodiment of the present invention;

FIG. 5 is an enlarged structural illustration of view C of FIG. 4 in accordance with the present invention;

fig. 6 is a structural diagram of a lap winding coil set of a phase winding of the motor according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a lap winding coil assembly of a phase winding of the motor according to another embodiment of the present invention;

fig. 8 is a structural diagram of a U-shaped coil in a lap winding coil set of a phase winding of the motor according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of another state of the U-shaped coil in the lap winding coil set of the phase winding of the motor in an embodiment of the invention;

fig. 10 is a schematic structural diagram of a wave winding coil with a lap winding coil group removed in one embodiment of a phase winding of the motor of the present invention;

FIG. 11 is an enlarged structural schematic of view B of FIG. 10 in accordance with the present invention;

FIG. 12 is a schematic diagram of a wave winding coil of a phase winding of the motor according to an embodiment of the present invention;

fig. 13 is a structural diagram illustrating a state of a branch of a phase winding of the motor in an embodiment of the present invention;

FIG. 14 is an expanded view of the phase A winding of a stator assembly of an embodiment of the present invention;

fig. 15 is a schematic diagram illustrating a connection structure of a first branch and a second branch of a phase winding of the motor according to an embodiment of the present invention;

fig. 16 is a schematic diagram illustrating a connection structure of a third branch and a fourth branch of a phase winding of the motor according to an embodiment of the present invention;

FIG. 17 is a schematic diagram of a structure in which multiple branches of a phase winding of the motor are connected in parallel according to an embodiment of the present invention

Fig. 18 is another structural diagram of a plurality of parallel branches of a phase winding of the motor in an embodiment of the invention.

Description of the element reference numerals

100. An iron core; 110. a wire slot;

200. a winding; 210. a lap winding coil group; 220. a wave winding coil;

230. a U-shaped coil; 231. a straight portion; 232. a connecting portion;

300. welding the part; 321. a twisting head section.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

Please refer to fig. 1 to 18. It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions of the present disclosure, so that the present disclosure is not limited to the technical essence, and any modifications of the structures, changes of the ratios, or adjustments of the sizes, can still fall within the scope of the present disclosure without affecting the function and the achievable purpose of the present disclosure.

Referring to fig. 1, the present 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. Wherein the number of slots per phase per pole of the motor may be defined as Q, and Q = Q/(2 mp). Wherein Q represents the number of slots of the motor, p represents the number of pole pairs of the motor, y represents the pole pitch of the motor, and m represents the number of phases of the motor. The pole pitch characterizes the distance between two adjacent magnetic poles of the motor on the surface of the armature, wherein the pole pitch can be represented by the number of slots of the motor, and y = Q/(2 p).

Referring to fig. 1, in one embodiment, the stator assembly includes a core 100 and windings 200. Specifically, the core 100 has a cylindrical shape, and the core 100 is further provided with a plurality of slots 110. The plurality of winding slots 110 are distributed along the circumferential direction of the core 100, the winding slots 110 are arranged on the core 100 in a penetrating manner, and the winding 200 can be allowed to be wound in the winding slots 110 of the core 100. It should be noted that, in the core 100, along the circumferential direction of the core 100, it is allowable to sequentially define the slot 110 as the 1 st slot, the 2 nd slot, …, the i-th slot, …, the N-th slot, …. Wherein, r slot layers are provided in each slot 110, and the slot layers are allowed to be respectively defined as a1 st layer, a2 nd layer, …, a j th layer, … and an r th layer in a direction from the outer side to the inner side along the radial direction of the core 100. It should be noted that the total number of slot levels in the wire slots 110 is an even number. Thus, within a single slot 110, it is possible to allow multiple conductors to be provided, with the conductors being correspondingly provided within different slot layers. Where the conductors located in different slot layers within different slot 110 may be allowed to be named by way of K (L). The K represents the position of the wire slot 110 where the conductor is located, and the L represents the number of the wire slots where the conductor is located in the wire slot 110.

Referring to fig. 2-5, in one embodiment, the motor is a multi-phase motor, and the windings 200 in the motor may alternatively be multi-phase windings. Each phase winding comprises a plurality of branches, and the plurality of branches are arranged in parallel, wherein for the winding 200 of the motor, the number of branches of each phase winding is a positive integer greater than or equal to 4. Specifically, for a leg, the leg may include a plurality of lap wound coil groups 210 and wave wound coils 220. The lap winding coil group 210 is wound on the iron core 100 of the stator assembly, and the coil is located in the slot 110. The lap winding coil groups 210 are distributed in the circumferential direction of the core 100, and the wave winding coil 220 is connected between two adjacent lap winding coil groups 210, so that the multiple lap winding coil groups 210 are connected in series with each other through the wave winding coil 220. In the circumferential direction along the iron core 100, the lap winding coil group 210 may be sequentially defined as a first lap winding coil group, a second lap winding coil group, …, an mth lap winding coil group, …, and an nth lap winding coil group.

Referring to fig. 4-5, in an embodiment, the lap winding coil assembly 210 may include a plurality of U-shaped coils 230, and the plurality of U-shaped coils 230 are sequentially connected in series. Specifically, the U-shaped coil 230 may include two linear portions 231 and a connecting portion 232, wherein the connecting portion 232 is connected between the two linear portions 231. It should be noted that, in the radial direction of the motor core 100, the two straight portions 231 in the single U-shaped coil 230 are different by one layer in the slot level position in the wire slot 110. For example, if the slot level position of one linear portion 231 of the U-shaped coil 230 in the slot 110 is the 2 nd level, the slot level position of the other linear portion 231 of the U-shaped coil 230 in the slot 110 is the 3 rd level. Wherein, for a single lap-wound coil group 210, the slot layer position of the U-shaped coil 230 included in the wire slot 110 is always located between the 2 nd layer and the r-1 st layer. For example, in the direction from the inner side to the outer side along the radial direction of the core 100 in the single lap winding coil group 210, it is allowable to sequentially define the U-shaped coil 230 as the 1 st U-shaped coil, the 2 nd U-shaped coil, the …, and the yU-shaped coil. Thus, one straight portion 231 in the 1U-shaped coil may be allowed to be located in the 2 nd layer slot layer in the slot 110, and the other straight portion in the 1U-shaped coil may be located in the 3 rd layer, and one straight portion 231 in the yU-shaped coil may be allowed to be located in the r-1 st layer slot layer in the slot 110, and one straight portion in the yU-shaped coil may be located in the r-2 th layer.

Referring to fig. 2, 4, 10 and 11, in one embodiment, two U-shaped coils 230 connected to each other may be connected by a welding portion 300. Specifically, the U-shaped coil 230 may have a twisted head section 321 connected thereto, and the twisted head section 321 is located on the straight portion 231. The button head section 321 may be provided with a welding portion 300, and two button head sections 321 connected to each other are welded by the welding portion 300. Therefore, for two straight portions 231 that need to be connected, it is possible to allow two torque segments 321 located on the corresponding straight portions 231 to be connected. Wherein, the two button head sections 321 which need to be connected are welded at the position of the welding part 300 to realize the connection between the adjacent U-shaped coils.

Referring to fig. 2-9, in one embodiment, a plurality of U-shaped coils 230 are sequentially wound in series and alternately in a single lap winding coil group 210. Specifically, it is permissible that the two straight portions 231 defining the U-shaped coil 230 be the first straight portion and the second straight portion, respectively, in the counterclockwise direction. The span between the first straight line part and the second straight line part is y +1 or y-1, and a side groove layer is arranged between the first straight line part and the second straight line part. And the two adjacent U-shaped coils are in tail connection. For example, in a single lap-wound coil assembly 210, the second straight portion of the 1 st U-shaped coil 230 is connected to the first straight portion of the 2 nd U-shaped coil 230, the second straight portion of the 2 nd U-shaped coil 230 is connected to the first straight portion of the 3 rd U-shaped coil 230, and so on until the second straight portion of the y-1 st U-shaped coil 230 is connected to the first straight portion of the yU-shaped coil 230. Wherein, for two interconnected U-shaped coils 230, the span between the second straight line portion and the first straight line portion is y, and the difference between the second straight line portion and the first straight line portion is a slot layer. It is noted that the U-shaped coils 230 within a single lap wound coil assembly 210 are arranged alternately with a span of y +1 and y-1. For example, if the span of the 1 st U-coil 230 is y +1, the span of the 2 nd U-coil 230 is y-1, the span of the 3 rd U-coil 230 is y +1, and so on, until the plurality of U-coils 230 in the single lap winding coil group 210 are connected in series. Therefore, each branch of the motor includes a plurality of spans of lap wound coils therein.

Referring to fig. 10-13, in one embodiment, adjacent lap coils 210 can be connected by a wave coil 220. Where the pitch of the wave winding coil 220 is y where all the wave winding coils in each phase winding of the motor have the pitch of y. Specifically, the wave winding coil 220 has a structure identical to that of the U-shaped coil 230, and includes two straight line portions 231 connected to each other by a connection portion 232. A torsion head section 321 is further connected to the other end of the linear portion 231, and is connected to the lap winding coil group 210 through the torsion head section 321. It is to be noted that one straight portion 231 of the wave-wound coil 220 is located in the innermost slot layer of the slot 110 of the core 100, and the other straight portion 231 of the wave-wound coil 220 is located in the outermost slot layer of the slot 110 of the core 100. In the connection process, the straight portion 231 of the wave-wound coil 220 located at the innermost slot layer is connected to the straight portion 231 of the lap-wound coil group 210 located at the 2 nd layer, and the straight portion 231 of the wave-wound coil 220 located at the outermost slot layer is connected to the straight portion 231 of the adjacent lap-wound coil group 210 located at the r-1 st layer. Thus, for the wave winding coil 220, it is a cross-layer coil and the cross-layer range of the wave winding coil 220 is from the innermost cross-layer of the core 100 wire slots 110 to the outermost layer of the core 100 wire slots 110.

It should be noted that, for the branch circuit, a leading-in coil and a leading-out coil are also included, and the leading-in of the current is realized through the leading-in coil and the leading-out of the current is realized through the leading-out coil. Wherein the lead-in coil is a wave winding coil, and the lead-in coil may include two linear portions 231. Wherein, the distance between two straight line parts 231 in the leading-in end coil is y +1 or y-1, and one straight line part 231 is the outermost layer of the slot 110 of the iron core 100, and the other straight line part 231 is the innermost layer of the slot 110 of the iron core 100. Further, the lead end coil is a lap winding coil, and the lead end coil may include two straight portions 231. The two linear portions 231 located in the leading end coil are located in adjacent slot layers in the slot 110 of the core 100. It should be noted that the end coils are located in the winding coil groups in the branches. In particular, the end-positioned coil in the n-th lap winding coil group of a branch may be defined as a lead-out coil, for example, the lead-out coil is the foremost or endmost coil in the lap winding coil group in the branch. In the radial direction of the iron core, the coil at the forefront represents the lap-wound coil close to the end position of the inner circle of the iron core, and the coil at the farthest end represents the lap-wound coil close to the end position of the outer circle of the iron core.

It can be understood that, for the leading end coil, the end of the corresponding straight portion 231 is connected with the turning head section 321, so that the leading end coil and the lap winding coil set can be connected through the turning head section 321. For the leading end coil, a twisting head section 321 is connected to the end of the corresponding straight line part 231, so that connection between the leading end coil and the lap winding coil group is allowed through the twisting head section 321. The current is thus introduced via the inlet coil and is discharged via the outlet coil.

In summary, in the branches of the motor winding 200, adjacent lap-wound coil groups 210 are connected by the wave-wound coil 220 to form a complete branch. Through the arrangement of the winding 200, the twisted slot pitches of the welding ends of the winding 200 are consistent, the complexity of the manufacturing process is reduced, the processing efficiency is improved, and the production cost is reduced. Meanwhile, by eliminating the gap bridge wire, the wiring mode of the winding 200 is simplified, thereby simplifying the process and improving the working efficiency.

Referring to fig. 14-18, in one embodiment, the winding 200 of the motor may allow a flat wire hairpin winding to be used, so that the winding 200 has a hairpin end (i.e., the connection portion 232) and a welding end (the welding portion 321), and the hairpin end and the welding end are respectively located at two sides of the core 100. The motor is a motor winding type motor with 8-pole and 48-phase slots and 8 wires in each slot, and the explanation are given by taking the motor as an example. The three phases of the motor may include an a phase, a B phase and a C phase, and the winding manners of the coil groups of the a phase, the B phase and the C phase are the same, and the difference is that the positions of the wire slots 110 where the wire inlet end and the wire outlet end corresponding to the a phase, the B phase and the C phase are located are different. For example, the phase a winding includes two branches, and the incoming line ends corresponding to the two branches may be 48 slots and 1 slot. The phase B winding comprises two branches, and the corresponding line inlet ends of the two branches can be 4 slots and 5 slots. The phase-C winding includes two branches, and the incoming line ends corresponding to the two branches may be 8 slots and 9 slots, but are not limited thereto, and may be determined according to actual requirements.

Referring to fig. 14-18, in an embodiment, the winding 200 includes a plurality of branches connected in parallel, and the number of the branches is a positive integer greater than or equal to 4. Therefore, taking the single-phase winding 200 including 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 incoming end of the winding 200, respectively. X1, X2, X3 and X4 are the outlet terminals of the winding 200, respectively.

Referring to fig. 14, fig. 14 is an expanded view of the phase a winding. In fig. 14, from left to right, 1 layer, 2 layers, 3 layers, 4 layers, 5 layers, 6 layers, 7 layers, and 8 layers are provided in this order.

Referring to fig. 15, in an embodiment, the position of the incoming line end of the first branch A1X1 in the slot 110 of the core 100 is 48 (1), and the specific winding manner of the first branch A1X1 of the phase-a winding may include:

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

referring to fig. 15, if the incoming line end of the second branch A2X2 is at 1 (1) in the slot 110 of the core 100, the specific winding manner of the second branch A2X2 of the phase-a winding may include:

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

referring to fig. 16, the incoming line end of the third branch A3X3 at the position of the slot 110 of the ferrite core 100 is 48 (8), and the specific winding manner of the third branch A3X3 of the phase-a winding may include:

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

referring to fig. 16, if the incoming line end of the fourth branch A4X4 is 1 (8) at the slot 110 of the core 100, the specific winding manner of the fourth branch A4X4 of the phase-a winding may include:

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

referring to fig. 17-18, in an embodiment, the distances of the wave winding coils 220 for connecting the adjacent lap winding coil groups 210 in the first branch, the second branch, the third branch and the fourth branch are all y. Accordingly, it is possible to allow a complete motor winding 200 to be constructed by interconnecting the first, second, third and fourth branches.

Referring to fig. 17, in an embodiment, there are 4 branches corresponding to the phase a winding, the phase B winding, and the phase C winding, and the branches are a first branch, a second branch, a third branch, and a fourth branch, respectively. Taking the phase a winding as an example, in the phase a winding, the incoming line ends corresponding to the first branch, the second branch, the third branch and the fourth branch are connected, the outgoing line end of the first branch is connected with the outgoing line end of the fourth branch, and the outgoing line ends of the second branch and the third branch are connected. For convenience of description, it is allowable to define a first branch and a fourth branch that are connected in parallel with each other as a first parallel branch, and define a second branch and a third branch that are connected in parallel with each other as a second parallel branch. It will be appreciated that in the winding 200 of the motor, the B-phase winding and the C-phase winding thereof may be defined with the first parallel branch and the second parallel branch in the same manner. Therefore, for the stator assembly, the outlet ends of the first branch of the a-phase winding, the B-phase winding and the C-phase winding are connected with each other to form a first star point line, and the emergence ends of the second branch of the a-phase winding, the B-phase winding and the C-phase winding are connected with each other to form a second star point line. The specific connection mode of the motor windings is not limited to the above, and the determination can be carried out according to actual requirements.

Referring to fig. 18, in an embodiment, taking the phase a winding as an example, in the phase a winding, the incoming line ends corresponding to the first branch, the second branch, the third branch and the fourth branch are connected, and the outgoing line ends corresponding to the first branch, the second branch, the third branch and the fourth branch are connected. The specific connection mode of the motor windings is not limited to the above, and the determination can be carried out according to actual requirements.

In summary, according to the wiring method, the winding welding ends are twisted and the slot pitches are consistent in the branches of the motor winding. The complexity of the manufacturing process can be reduced, the processing efficiency is improved, and the production cost is reduced. Meanwhile, a gap bridge wire is eliminated, and the wiring mode of the winding is simplified, so that the process is simplified, and the working efficiency is improved. And then improve the winding of motor and at the inconsistent and low problem of motor reliability of the distortion slot pitch of weld end. Therefore, the invention effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A winding for an electric machine, comprising:

a multi-phase winding, each phase of said winding comprising a plurality of legs, said legs comprising:

a wave winding coil with a span y;

the span of all the wave winding coils in each phase of winding is y, the adjacent winding coil groups are connected in series through the wave winding coils, one end of each wave winding coil is connected to the U-shaped coil at the innermost side of one lap winding coil group, and the other end of each wave winding coil is connected to the U-shaped coil at the outermost side of the adjacent lap winding coil group.

2. The electrical machine winding of claim 1, wherein within a single said lap-wound coil group, a plurality of said U-shaped coils are connected in series, and said U-shaped coils are alternately spaced by y +1 and y-1.

3. The motor winding according to claim 1, wherein the branches are arranged in parallel, and the number of the branches is a positive integer greater than or equal to 4.

4. A stator assembly, comprising:

the multi-phase winding, the winding is coiled on the iron core, every looks the winding includes many branches, the branch includes:

a wave winding coil having a span y;

5. The stator assembly of claim 4, wherein N slot layers are disposed within the slot of the core, and wherein N is an even number.

6. The stator assembly of claim 4 wherein the U-shaped coils are located between the 2 nd slot tier and the N-1 st slot tier within a single lap wound coil group.

7. The stator assembly of claim 5, wherein the U-shaped coil comprises:

two straight line portions; and

a connecting portion connected between the two linear portions;

and in the radial direction of the motor iron core, the difference between the two linear parts positioned in the single U-shaped coil is one slot layer.

8. The stator assembly of claim 5 wherein one end of said wave winding coil is located in the 1 st slot level of said core and the other end of said wave winding coil is located in the nth slot level of said core.

9. The stator assembly of claim 4 further comprising a lead-in coil in series with said set of lap wound coils at a forward-most end of said legs, wherein said lead-in coil is a wave wound coil.