CN117013731A

CN117013731A - Stator assembly, motor and vehicle

Info

Publication number: CN117013731A
Application number: CN202310862141.3A
Authority: CN
Inventors: 蔡唯世; 张雨萌; 王伟钢; 徐鹏
Original assignee: Guangzhou Xiaopeng Motors Technology Co Ltd
Current assignee: Guangzhou Xiaopeng Motors Technology Co Ltd
Priority date: 2023-07-13
Filing date: 2023-07-13
Publication date: 2023-11-07

Abstract

The application provides a stator assembly, a motor and a vehicle, wherein the stator assembly comprises a stator iron core and windings, 72 coil slots are circumferentially distributed on the inner wall of the stator iron core, the direction from a notch of each coil slot to the bottom of each slot is the radial direction of the stator iron core, and a plurality of coil layers are arranged on each coil slot; the winding comprises three branches connected in parallel; in the same branch, the initial end of a coil is electrically connected with the end of an adjacent coil and is overlapped with two adjacent coil layers; the first coil and the third coil are respectively distributed on the first coil layer and the bottom coil layer and are all spanned by the same layer; the second coil is positioned on the coil layer between the first coil layer and the bottom coil layer and spans the adjacent two coil layers; the starting ends of the starting coils of the three branches are all positioned on the same layer of the coil layer and are positioned in adjacent coil grooves, and the terminating ends of the terminating coils of the three branches are all positioned on the same layer of the coil layer and are positioned in adjacent coil grooves, so that the connection difficulty of the three branches and other structures can be reduced.

Description

Stator assembly, motor and vehicle

Technical Field

The application relates to the technical field of motors, in particular to a stator assembly, a motor and a vehicle.

Background

Stator assemblies typically have two winding distribution schemes, wave winding and lap winding. Lap windings allow for more winding distribution schemes than wave windings.

In the lap winding distribution scheme, the coil outlet ends of the coils of the multiple branches are far apart, so that the connection cost is increased.

Disclosure of Invention

The present application is directed to a stator assembly, an electric machine or a vehicle, which is adapted to improve at least one of the above technical problems.

The application achieves the above object by the following technical scheme.

In a first aspect, an embodiment of the present application provides a stator assembly, where the stator assembly includes a stator core and a winding, 72 coil slots are distributed on an inner wall of the stator core along a circumferential direction, a direction from a slot opening of the coil slots to a slot bottom is a radial direction of the stator core, and a plurality of coil layers are disposed in the direction from the slot opening to the slot bottom; the winding comprises three branches connected in parallel, each branch is formed by sequentially connecting a plurality of coils, each coil is provided with a starting end and a terminating end, and the starting end and the terminating end of the same coil are positioned in different coil grooves; in the same branch, the initial end of a coil is electrically connected with the end of an adjacent coil and is overlapped with two adjacent coil layers; the coils comprise a first coil, a second coil and a third coil, wherein the first coil and the third coil are respectively distributed on a first coil layer and a bottom coil layer and are all spanned by the same layer; the second coil is positioned on the coil layer between the first coil layer and the bottom coil layer and spans the adjacent two coil layers; the initial ends of the initial coils of the three branches are all positioned on the same layer of the coil layer and are positioned in adjacent coil grooves; the terminating ends of the terminating coils of the three branches are all located on the same layer of the coil layer and are located in adjacent coil slots.

In some embodiments, the coil slot is provided with M coil layers in a direction from the slot opening to the slot bottom; each branch is formed by connecting a plurality of first sub-circuits and second sub-circuits, the first sub-circuits are formed by sequentially connecting first coils and N second coils, and the second sub-circuits are formed by sequentially connecting third coils and N second coils; the first sub-path and the second sub-path are connected end to end and are alternately arranged; wherein m=2n+2, n is an integer greater than or equal to 1.

In some embodiments, the first coil spans 10 coil slots or 12 coil slots; the spans of the N second coils are 12 coil slots; the third coil has a span of 9 coil slots, 10 coil slots, 11 coil slots, 12 coil slots, or 13 coil slots.

In some embodiments, the first coil spans 10 coil slots or 12 coil slots; the span of one second coil in the N second coils is 11 coil grooves, and the spans of the other second coils are 12 coil grooves; the third coil has a span of 9 coil slots, 10 coil slots, 11 coil slots, 12 coil slots, or 13 coil slots.

In some embodiments, the three branches include a first branch connected in the following manner: the third coil-span is 9, N second coils, the first coil-span is 12, N second coils, the third coil-span is 13, N second coils, the first coil-span is 12, N second coils, the third coil-span is 12, N second coils, the first coil-span is 12, N second coils, the third coil-span is 11, N second coils, the first coil-span is 12, N second coils.

In some embodiments, the three branches further comprise a second branch connected in the following manner: the third coil-span is 12, N second coils, the first coil-span is 12, N second coils, the third coil-span is 11, N second coils, the first coil-span is 12, N second coils, the third coil-span is 9, N second coils, the first coil-span is 12, N second coils, the third coil-span is 13, N second coils, the first coil-span is 12, N second coils.

In some embodiments, the three branches further comprise a third branch connected in the following manner: the third coil-span is 10, N second coils, the first coil-span is 12, N second coils, the third coil-span is 11, N second coils, the first coil-span is 10, N second coils, the third coil-span is 12, N second coils, the first coil-span is 10, N second coils, the third coil-span is 11, N second coils, the first coil-span is 12, N second coils.

In some embodiments, the stator assembly includes three-phase windings, each phase winding being identical in structure.

In some embodiments, the three legs are symmetrical about the magnetic circuit.

In a second aspect, embodiments of the present application provide an electric machine comprising a rotor and a stator assembly according to any of the embodiments described above.

In a third aspect, an embodiment of the present application provides a vehicle, including a vehicle body and the motor in the above embodiment, the motor being mounted to the vehicle body.

In the stator assembly, the motor and the vehicle provided by the embodiment of the application, the stator assembly comprises a stator iron core and windings, 72 coil slots are distributed on the inner wall of the stator iron core along the circumferential direction, the direction from the notch of the coil slot to the slot bottom is the radial direction of the stator iron core, and a plurality of coil layers are arranged in the direction from the notch of the coil slot to the slot bottom; the winding comprises three branches connected in parallel, each branch is formed by sequentially connecting a plurality of coils, each coil is provided with a starting end and a terminating end, and the starting end and the terminating end of the same coil are positioned in different coil grooves; in the same branch, the initial end of a coil is electrically connected with the end of an adjacent coil and is overlapped with two adjacent coil layers; the coils comprise a first coil, a second coil and a third coil, wherein the first coil and the third coil are respectively distributed on a first coil layer and a bottom coil layer and are all spanned by the same layer; the second coil is positioned on the coil layer between the first coil layer and the bottom coil layer and spans the adjacent two coil layers; the first and last coils of each branch are respectively a start coil and an end coil. The starting ends of the starting coils of the three branches are all positioned on the same layer of the coil layer and are positioned in adjacent coil grooves, so that the distance between the starting ends of the starting coils of the three branches can be shortened. The terminating ends of the terminating coils of the three branches are positioned on the same layer of the coil layer and are positioned in the adjacent coil grooves, so that the distance between the terminating ends of the terminating coils of the three branches is shortened, the connection difficulty of the three branches and other structures can be reduced, and the connection cost is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic structural diagram of a vehicle according to an embodiment of the present application.

Fig. 2 shows a schematic structural diagram of a stator assembly according to an embodiment of the present application.

Fig. 3 shows a schematic structural view of another view of the stator assembly of fig. 2.

Fig. 4 shows a schematic top view of the stator core of fig. 2.

Fig. 5 shows a schematic view of the stator assembly of fig. 2 in partial cross-section.

Fig. 6 shows a schematic structural diagram of the first coil in fig. 2.

Fig. 7 shows a schematic structural diagram of the second coil in fig. 2.

Fig. 8 shows a schematic structural view of the third coil in fig. 2.

Fig. 9 shows a schematic diagram of the unfolded connection of the first leg of fig. 2.

Fig. 10 shows a schematic diagram of the unfolded connection of the second leg of fig. 2.

Fig. 11 shows a schematic diagram of the unfolded connection of the third leg in fig. 2.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present application and are not to be construed as limiting the present application.

In order to make the technical solution of the present application better understood by those skilled in the art, the following description will be made in detail and complete with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the application. All other embodiments, based on the embodiments of the application, which a person skilled in the art would obtain without making any inventive effort, are within the scope of the application.

Referring to fig. 1, an embodiment of the present application provides a vehicle 1, where the vehicle 1 may be an electric car, a hybrid electric car, a flying car or other vehicles.

The vehicle 1 includes a vehicle body 10 and a motor 30, the motor 30 being mounted to the vehicle body 10, the motor 30 being capable of acting as a power source for the vehicle 1 to provide driving power for the vehicle 1.

In some embodiments, the motor 30 may be a three-phase motor.

In some embodiments, the motor 30 may be a flat wire motor.

In some embodiments, the motor 30 may include a motor housing that may provide mounting locations and protection for structures within the motor 30.

Referring to fig. 1-3, in some embodiments, the motor 30 includes a rotor and a stator assembly 31, the rotor may be located within the stator assembly 31, and both the stator assembly 31 and the rotor may be mounted within a motor housing. The stator assembly 31 generates electromagnetic force to drive the rotor to rotate after being electrified.

Referring to fig. 2 to 4, in some embodiments, the stator assembly 31 includes a stator core 310 and a winding 350, 72 coil slots 311 are distributed on an inner wall of the stator core 310 along a circumferential direction, a direction from a slot opening of the coil slots 311 to a slot bottom is a radial direction of the stator core 310, and a plurality of coil layers 313 are disposed on the coil slots 311 from the slot opening to the slot bottom.

Wherein 72 coil slots 311 may be equally and uniformly distributed on the inner circumferential surface of stator core 310.

As shown in fig. 5, the coil layers 313 specifically refer to the number of layers in which all the coil grooves 311 are distributed in the direction from the notch to the groove bottom, and each of the coil grooves 311 has the same number of layers in the direction from the notch to the groove bottom. For example, the notch position of each coil groove 311 is located at the first coil layer 3131, and the groove bottom position of each coil groove 311 is located at the bottom coil layer 3133.

The winding 350 includes three parallel branches 351, each branch 351 is formed by sequentially connecting a plurality of coils 3510, each coil 3510 has a start end 3511 and a stop end 3513, and the start end 3511 and the stop end 3513 of the same coil 3510 are located in different coil slots 311; in the same branch 351, the start end 3511 of the coil 3510 is electrically connected to the end 3513 of the adjacent coil 3510 and is stacked on the adjacent two coil layers 313, and by adopting the end-to-end connection between the coils 3510 and 3510, the coils 3510 and 3510 are electrically connected only through the start end 3511 and the end 3513, so that the connection positions can be reduced, and the fault rate can be reduced.

The start end 3511 of one coil 3510 is electrically connected to the end 3513 of the adjacent coil 3510 and is stacked on the adjacent two coil layers 313, specifically, in the same branch 351, the end 3513 of any coil 3510 and the start end 3511 of the adjacent coil 3510 are stacked on different coil layers 313 and are electrically connected. Wherein, the electrical connection may refer to soldering.

Referring to fig. 6 to 8, the plurality of coils 3510 include a first coil 3515, a second coil 3517 and a third coil 3519, wherein the first coil 3515 and the third coil 3519 are respectively distributed in a first coil layer 3131 and a bottom coil layer 3133, and all cross over each other in the same layer; the second coil 3517 is located in the coil layer 313 between the first coil layer 3131 and the bottom coil layer 3133 and spans the adjacent two coil layers 313, so that the first coil 3515, the second coil 3517 and the third coil 3519 can be distributed in different coil slots 311 and coil layers 313, which helps to reduce the unused condition of the coil slots 311 or the coil layers 313.

The first coil layer 3131 may be located at a notch of the coil groove 311 or may be located at a groove bottom of the coil groove 311. The bottom coil layer 3133 may be positioned at the notch of the coil groove 311 or at the groove bottom of the coil groove 311. The first coil layer 3131 and the bottom coil layer 3133 are respectively distributed on the notch and the groove bottom of the coil groove 311.

The first coil 3515 and the third coil 3519 are respectively distributed in the first coil layer 3131 and the bottom coil layer 3133, which may mean that the first coil 3515 is located in the first coil layer 3131, the third coil 3519 is located in the bottom coil layer 3133, and may also mean that the first coil 3515 is located in the bottom coil layer 3133, and the third coil 3519 is located in the first coil layer 3131.

The same layer spanning specifically means that the start end 3511 and the end 3513 of the same coil 3510 are located at the same coil layer 313, but span different coil slots 311.

The beginning and end coils 3510 of each leg 351 are the start coil and the end coil, respectively. The start end 3511 of the start coil is used for being connected with other structures, specifically, the start end 3511 of the start coil is used for being electrically connected with a bus bar so as to connect the three branches 351 in parallel; the terminating end 3513 of the starting coil is connected to the starting end 3511 of an adjacent coil 3510. The terminating end 3513 of the terminating coil is used for connecting with other structures, specifically, the terminating end 3513 of the terminating coil is used for electrically connecting with the bus bar to connect the three branches 351 in parallel; the start end 3511 of the terminating coil is adapted to connect with the start end 3511 of an adjacent coil 3510. It should be noted that the bus bar connected to the start end 3511 of the start coil and the bus bar connected to the end 3513 of the end coil may be different bus bars.

The starting ends 3511 of the starting coils of the three branches 351 are all located on the same layer of the coil layer 313 and located in the adjacent coil slots 311, so that the distance between the starting ends 3511 of the starting coils of the three branches 351 is reduced, and therefore, the connection difficulty between the three branches 351 and other structures, for example, the connection difficulty between the three branches 351 and the bus bar is reduced, the connection cost is reduced, and the process difficulty and the manufacturing cost of the bus bar are reduced.

The terminating ends 3513 of the terminating coils of the three branches 351 are all located on the same layer of the coil layer 313 and located in the adjacent coil slots 311, which helps to shorten the distance between the terminating ends 3513 of the terminating coils of the three branches 351, thereby reducing the connection difficulty of the three branches 351 and other structures, for example, reducing the connection difficulty of the three branches 351 and the bus bar, reducing the connection cost, and reducing the process difficulty and the manufacturing cost of the bus bar.

For ease of understanding, the start end 3511 of the start coil of the leg 351 is designated as a first lead end 3521, and the end 3513 of the end coil of the leg 351 is designated as a second lead end 3523.

In some embodiments, the stator assembly 31 may include three-phase windings 350, and the structure of each phase winding 350 may be identical, so that manufacturing costs may be reduced.

For example, the three-phase windings 350 may be U-phase windings, V-phase windings, and W-phase windings. The U-phase winding, the V-phase winding and the W-phase winding respectively include three parallel branches 351, and the three branches 351 of each phase winding 350 have the same structure, i.e., the first branch 3550 of the U-phase winding, the first branch 3550 of the V-phase winding and the first branch 3550 of the W-phase winding have the same structure, the second branch 3560 of the U-phase winding, the second branch 3560 of the V-phase winding and the second branch 3560 of the W-phase winding have the same structure, and the third branch 3570 of the U-phase winding, the third branch 3570 of the V-phase winding and the third branch 3570 of the W-phase winding have the same structure.

Wherein, the three-phase windings 350 have the same structure, and each phase winding 350 may be distributed in different coil slots 311.

For convenience of description, one phase winding 350 of the three phase windings 350 is described below.

In some embodiments, the three legs 351 are symmetrical about the magnetic circuit, thereby helping to eliminate circulation between the three legs 351.

In some embodiments, the three branches 351 may include a first branch 3550, a second branch 3560, and a third branch 3570.

Referring to fig. 6-8, in some embodiments, the coil 3510 can include a closed segment 3529, an open segment 3525, and two spaced apart straight segments 3527. One end of the two straight sections 3527 is connected in a closed state by a closed section 3529. The open section 3525 includes a start end 3511 and a stop end 3513, the start end 3511 and the stop end 3513 being connected to a side of the two straight sections 3527 facing away from the closed section 3529, respectively.

The first, second and third coils 3515, 3517, 3519 each include a straight segment 3527, a closed segment 3529 and an open segment 3525. The first coil 3515, the second coil 3517, and the third coil 3519 may have a difference in the open section 3525. Specifically, the start end 3511 and the end 3513 of the first coil 3515 may face the same side. The start end 3511 and the end 3513 of the second coil 3517 face opposite. The start end 3511 and the end 3513 of the third coil 3519 may face the same side and face opposite to the start end 3511 and the end 3513 of the first coil 3515.

It will be appreciated that for the start coil, the start end 3511 of the start coil is configured to be electrically connected to the bus bar, and thus, the start end 3511 of the start coil may or may not be located on the extension of the straight segment 3527. For the terminating coil, the terminating end 3513 of the terminating coil is configured to electrically connect to the bus bar, and thus, the terminating end 3513 of the terminating coil may or may not be located on the extension of the straight segment 3527.

In some embodiments, in the first branch 3550, two straight line segments 3527 of the initial coil may be respectively disposed in any coil slot 311, so that the position of the initial coil may not need to be calibrated, assembly difficulty is reduced, and assembly efficiency is improved. The start coils of the second leg 3560 and the third leg 3570 can then be adjacently disposed according to the coil slot 311 in which the start coil of the first leg 3550 is located.

In some embodiments, the 72 coil slots 311 are in sequence: 1 st coil slot, 2 nd coil slot, 3 rd coil slot, 4 th coil slot … … 69 th coil slot, 70 th coil slot, 71 st coil slot and 72 nd coil slot.

Referring to fig. 2, 4 and 5, in some embodiments, the coil slot 311 may be provided with M coil layers 313 in a direction from the slot opening to the slot bottom; each branch 351 is formed by connecting a plurality of first sub-paths and second sub-paths, the first sub-paths are formed by sequentially connecting a first coil 3515 and N second coils 3517, and the second sub-paths are formed by sequentially connecting a third coil 3519 and N second coils 3517; the first sub-path and the second sub-path are connected end to end and are alternately arranged, wherein M=2N+2, and N is an integer greater than or equal to 1. Thus, stator core 310 having coil layers 313 of 4 or more even layers is applied to stator assembly 31 in the embodiment of the present application, and the range of application of stator assembly 31 is increased.

As an example, when N is 1, M is equal to 4, and at this time, the number of coil layers 313 is 4, the first sub-route is formed by connecting the first coil 3515 and the second coil 3517 end to end, and the second sub-route is formed by connecting the third coil 3519 and the second coil 3517 end to end.

As another example, when N is 3, M is equal to 8, and at this time, the number of coil layers 313 is 8, the first sub-route first coil 3515 and 3 second coils 3517 are connected end to end in sequence, and the second sub-route third coil 3519 and 3 second coils 3517 are connected end to end in sequence.

The 8 coil layers 313 may be a 1 st coil layer, a 2 nd coil layer, a 3 rd coil layer, a 4 th coil layer, a 5 th coil layer, a 6 th coil layer, a 7 th coil layer, and an 8 th coil layer, respectively. The 1 st coil layer and the 8 th coil layer may be located at the notch and the groove bottom of the coil groove 311, respectively. When the 1 st coil layer is positioned in the notch, the 8 th coil layer is positioned at the bottom of the groove; when the 1 st coil layer is positioned at the groove bottom, the 8 th coil layer is positioned at the notch. For ease of understanding, the following explanation will be given by taking the example that the 1 st coil layer is located in the notch and the 8 th coil layer is located in the slot bottom.

In some embodiments, as dimension a in fig. 6-8, a represents the span of the start end 3511 and the span of the end 3513. The first coil 3515 may have a start end 3511 and a stop end 3513 each of 6 coil slots 311, the second coil 3517 may have a start end 3511 and a stop end 3513 each of 6 coil slots 311, and the third coil 3519 may have a start end 3511 and a stop end 3513 each of 6 coil slots 311.

In this embodiment, the spans of the start end 3511 and the end 3513 specifically refer to the number of coil slots 311 spanned by the start end 3511 and the corresponding straight segment 3527 (the straight segment 3527 connected to the start end 3511) and the number of coil slots 311 spanned by the end 3513 and the corresponding straight segment 3527 (the straight segment 3527 connected to the end 3513) in the same coil 3510. For example, taking the first coil 3515 as an example, the straight line segment 3527 of the first coil 3515 may be a first straight line segment and a second straight line segment, respectively, and the opening segment 3525 includes a first opening segment and a second opening segment, where the first opening segment is connected to the first straight line segment, and the second opening segment is connected to the second straight line segment. The start end 3511 is located in the first open section and the end 3513 is located in the second open section. The first straight line segment and the start end 3511 span 6 coil slots 311 and the second straight line segment and the end 3513 span 6 coil slots 311.

In some embodiments, dimension b, as in fig. 6-8, b represents the difference in the number of slots of the coil slot 311 in which the two straight segments 3527 are located. The span of the first coil 3515 may be 10 coil slots 311 or 12 coil slots 311; the spans of the N second coils 3517 are 12 coil slots 311; the third coil 3519 may have a span of 9 coil slots 311, 10 coil slots 311, 11 coil slots 311, 12 coil slots 311, or 13 coil slots 311. As such, the stator assembly 31 facilitates locating the first lead-out ends 3521 of the plurality of legs 351 adjacent and locating the second lead-out ends 3523 of the plurality of legs 351 adjacent by employing a plurality of coils 3510, each coil 3510 employing one or more spans.

The span of the first coil 3515, the span of the second coil 3517, and the span of the third coil 3519 specifically refer to the difference in the number of slots of the coil slot 311 in which the two straight line segments 3527 of the coil 3510 are located. For example, the span of the first coil 3515 is 9 coil slots 311, which means that the first straight line segment is located in the 1 st coil slot 311, and the second straight line segment is located in the 10 th coil slot 311, and the difference in the number of slots of the coil slots 311 in which the first straight line segment and the second straight line segment are located is 9 coil slots 311.

In some embodiments, the second coil 3517 may be a full-length winding or a short-length winding, and when the span of the second coil 3517 is 12 coil slots 311, the second coil 3517 is a full-length winding. When the span of the second coil 3517 is smaller than 12 coil slots 311, the second coil 3517 is a short distance winding, e.g., the span of the second coil 3517 is 11 coil slots 311.

In some embodiments, one second coil 3517 of the N second coils 3517 may have a span of 11 coil slots 311, and the remaining second coils 3517 may each have a span of 12 coil slots 311, with a short distance winding from the N second coils 3517, which may help to eliminate harmonics by providing a short distance winding.

In some embodiments, when N is an odd number, the short distance winding of the N second coils 3517 may be located at the middle of the other second coils 3517, which helps to enhance the harmonic cancellation effect. For example, when N is 5, the connection manner of the N second coils 3517 may be: second coil 3517-span 12, second coil 3517-span 11, second coil 3517-span 12.

Referring to fig. 2, 9, 10 and 11, in fig. 9, 10 and 11, a horizontal box represents the coil slot 311 and a vertical box represents the coil layer 313. In fig. 9, 10 and 11, both ends of the solid arrows represent the coil slots 311 where the two straight line segments 3527 of the coil 3510 are located, and the dotted arrows represent the sum of the span of the terminating end 3513 of the coil 3510 and the span of the starting end 3511 of the adjacent coil 3510, and in the embodiment of the present application, the dotted arrows each span 12 coil slots 311.

As shown in fig. 2 and 9, in some embodiments, the first branch 3550 is connected in the following manner: the third coil 3519-span is 9, the N second coils 3517, the first coil 3515-span is 12, the N second coils 3517, the third coil 3519-span is 13, the N second coils 3517, the first coil 3515-span is 12, the N second coils 3517, the third coil 3519-span is 12, the N second coils 3517, the first coil 3515-span is 12, the N second coils 3517, the third coil 3519-span is 11, the N second coils 3517, the first coil 3515-span is 12, the N second coils 3517. In this manner, first leg 3550 may extend the range of use of stator assembly 31 by adjusting the number of second coils 3517 to accommodate stator core 310 having a different number of coil layers 313.

As shown in fig. 2 and 10, in some embodiments, the second branch 3560 is connected in the following manner: the third coil 3519-span is 12, the N second coils 3517, the first coil 3515-span is 12, the N second coils 3517, the third coil 3519-span is 11, the N second coils 3517, the first coil 3515-span is 12, the N second coils 3517, the third coil 3519-span is 9, the N second coils 3517, the first coil 3515-span is 12, the N second coils 3517, the third coil 3519-span is 13, the N second coils 3517, the first coil 3515-span is 12, the N second coils 3517. In this manner, second leg 3560 may extend the range of use of stator assembly 31 by adjusting the number of second coils 3517 to accommodate stator core 310 having a different number of coil layers 313.

As shown in fig. 2 and 11, in some embodiments, the third branch 3570 is connected in the following manner: the third coil 3519-span is 10, the N second coils 3517, the first coil 3515-span is 12, the N second coils 3517, the third coil 3519-span is 11, the N second coils 3517, the first coil 3515-span is 10, the N second coils 3517, the third coil 3519-span is 12, the N second coils 3517, the first coil 3515-span is 10, the N second coils 3517, the third coil 3519-span is 11, the N second coils 3517, the first coil 3515-span is 12, the N second coils 3517. In this manner, third leg 3570 may extend the range of use of stator assembly 31 by adjusting the number of second coils 3517 to accommodate stator core 310 having a different number of coil layers 313.

As an example, taking N equal to 3 and m equal to 8, and a span of one second coil 3517 of the 3 second coils 3517 is 11 coil slots 311, spans of the remaining 2 second coils 3517 are 12 coil slots 311 as an example, a specific connection manner of the first branch 3550, the second branch 3560 and the third branch 3570 is as follows:

as shown in fig. 2 and 9, U in fig. 9 ₁ + represents the first extractionEnd 3521, U ₁ Representing a second tap 3523. The connection mode of the first branch 3550 specifically includes: third coil 3519 (starting coil) -span 9, second coil 3517-span 12, second coil 3517-span 11, second coil 3517-span 12, first coil 3515-span 12, second coil 3517-span 11, second coil 3517-span 12, third coil 3519-span 13, second coil 3517-span 12, second coil 3517-span 11, second coil 3517-span 12, first coil 3515-span 12, second coil 3517-span 11, second coil 3517-span 12 the third coil 3519-span is 12, the second coil 3517-span 11, the second coil 3517-span 12, the first coil 3515-span 12, the second coil 3517-span 11, the second coil 3517-span 12, the third coil 3519-span 11, the second coil 3517-span 12, the second coil 3517-span 11, the second coil 3517-span 12, the first coil 3515-span 12, the second coil 3517-span 11, the second coil 3517 (terminating coil) -span 12.

In the first branch 3550, the first coil 3515, the second coil 3517, and the third coil 3519 span the coil slot 311, as shown in fig. 9.

The start winding of the first leg 3550 may be disposed in the bottom winding layer 3133 (layer 8), and the end winding is disposed in the secondary bottom winding layer (layer 7) adjacent to the bottom winding layer 3133. According to the connection mode of the first branch 3550, when the two straight-line segments 3527 of the start coil can be respectively disposed in the 4 th coil slot and the 13 th coil slot, the two straight-line segments 3527 of the end coil are respectively disposed in the 4 th coil slot and the 16 th coil slot.

As shown in fig. 2 and 10, U in fig. 10 ₂ + represents the first lead-out end 3521, U ₂ Representing a second tap 3523. The connection mode of the second branch 3560 specifically includes: third coil 3519 (initial coil) -span 12, second coil 3517-span 11, second coil 3517-span 12, first coil 3515-span 12, second coil 3517-span 11, secondCoil 3517-span 12, third coil 3519-span 11, second coil 3517-span 12, second coil 3517-span 11, second coil 3517-span 12, first coil 3515-span 12, second coil 3517-span 11, second coil 3517-span 12, second coil 3519-span 9, second coil 3517-span 12, second coil 3517-span 11, second coil 3517-span 12, first coil 3515-span 12, second coil 3517-span 11, second coil 3517-span 12, and second coil 3517-span 12.

In the second leg 3560, the coil slot 311 spanned by the first coil 3515, the second coil 3517, and the third coil 3519 is as shown in fig. 10.

The start winding of the second leg 3560 can be disposed on the bottom winding layer 3133, and the end winding of the second leg 3560 can be disposed on a secondary bottom winding layer adjacent to the bottom winding layer 3133. When the two straight-line segments 3527 of the initial coil are respectively disposed in the 3 rd coil slot and the 14 th coil slot, the two straight-line segments 3527 of the final coil are respectively disposed in the 3 rd coil slot and the 15 th coil slot according to the connection mode of the second branch 3560.

As shown in fig. 2 and 11, U in fig. 11 ₃ + represents the first lead-out end 3521, U ₃ Representing a second tap 3523. The connection mode of the third branch 3570 specifically includes: third coil 3519 (starting coil) -span 10, second coil 3517-span 12, second coil 3517-span 11, second coil 3517-span 12, first coil 3515-span 12, second coil 3517-span 11, second coil 3517-span 12, third coil 3519-span 11, second coil 3517-span 12, second coil 3517-span 11, second coil 3517-span 12, first coil 3515-span 10, second coil 3517-span 12, second coil 3517-span 11, second coil 3517-span 12, third coil 3519-span 12, second coil 3517-span 11, second coil 3517-span 12, First coil 3515-span 10, second coil 3517-span 12, second coil 3517-span 11, second coil 3517-span 12, third coil 3519-span 11, second coil 3517-span 12, second coil 3517-span 11, second coil 3517-span 12, first coil 3515-span 12, second coil 3517-span 11, second coil 3517 (terminating coil) -span 12.

In the third leg 3570, the first coil 3515, the second coil 3517, and the third coil 3519 span the coil slot 311, as shown in fig. 11.

The start winding of the third leg 3570 may be disposed on the bottom winding layer 3133, and the end winding of the third leg 3570 is disposed on a secondary bottom winding layer adjacent to the bottom winding layer 3133. When the two straight line segments 3527 of the start coil are disposed in the 2 nd coil slot and the 64 th coil slot, the two straight line segments 3527 of the end coil are disposed in the 2 nd coil slot and the 14 th coil slot according to the connection mode of the third branch 3570.

In this example, the start coils of the first leg 3550, the second leg 3560, and the third leg 3570 are each located in the bottom layer coil layer 3133, and the end coils of the first leg 3550, the second leg 3560, and the third leg 3570 are each located in the secondary bottom layer coil layer adjacent to the bottom layer coil layer 3133. The two straight line segments 3527 of the start coil of the first branch 3550 are distributed in the 4 th coil slot and the 13 th coil slot, the two straight line segments 3527 of the start coil of the second branch 3560 are distributed in the 3 rd coil slot and the 14 th coil slot, and the two straight line segments 3527 of the start coil of the third branch 3570 are distributed in the 2 nd coil slot and the 64 th coil slot, so that the first lead-out end 3521 of the first branch 3550, the first lead-out end 3521 of the second branch 3560, and the first lead-out end 3521 of the third branch 3570 are respectively disposed in the adjacent 4 th coil slot, 3 rd coil slot, and 2 nd coil slot.

The two straight line segments 3527 of the termination coil of the first leg 3550 are distributed in the 4 th and 16 th coil slots, the two straight line segments 3527 of the termination coil of the second leg 3560 are distributed in the 3 rd and 15 th coil slots, and the two straight line segments 3527 of the termination coil of the third leg 3570 are distributed in the 2 nd and 14 th coil slots. The second lead-out end 3523 of the first leg 3550, the second lead-out end 3523 of the second leg 3560, and the second lead-out end 3523 of the third leg 3570 are disposed in adjacent 16 th, 15 th, and 14 th coil slots.

So, the first leading-out ends 3521 of the three branches 351 are distributed in the adjacent coil slots 311, and the second leading-out ends 3523 of the three branches 351 are also distributed in the adjacent coil slots 311, so that the distribution of the first leading-out ends 3521 can be more concentrated, the distribution of the second leading-out ends 3523 can be more concentrated, the connection difficulty of the first leading-out ends 3521 bus bars of the branches 351 is reduced, and the connection difficulty of the second leading-out ends 3523 of the branches 351 and the bus bars is reduced.

As another example, compared to the previous example, the spans of the N second coils 3517 in the present example are all 12 coil slots 311, and the specific connection manner of the first branch 3550, the second branch 3560, and the third branch 3570 is as follows:

The connection mode of the first branch 3550 specifically includes: third coil 3519 (starting coil) -span 9, second coil 3517-span 12, first coil 3515-span 12, second coil 3517-span 12 third coil 3519-span 13, second coil 3517-span 12, first coil 3515-span 12, second coil 3517-span 12 third coil 3519-span 12, second coil 3517-span 12, first coil 3515-span 12, second coil 3517-span 12 the third coil 3519-span 11, the second coil 3517-span 12, the first coil 3515-span 12, the second coil 3517 (terminating coil) -span 12.

In comparison with the connection method of the first branch 3550 in the previous example, in the present example, the number of the coil slots 311 spanned by the two straight-line segments 3527 of the start coil of the first branch 3550 is unchanged, and the two straight-line segments 3527 of the start coil are still disposed in the 4 th coil slot and the 13 th coil slot respectively. It can be understood that, since the spans of the N second coils 3517 are 12 coil slots 311 in the present example, the number of the coil slots 311 in which the two straight line segments 3527 of the terminating coil of the first branch 3550 are located is increased by 1, and the two straight line segments 3527 of the terminating coil are respectively disposed in the 5 th coil slot and the 17 th coil slot according to the connection manner of the first branch 3550.

The connection mode of the second branch 3560 specifically includes: third coil 3519 (starting coil) -span 12, second coil 3517-span 12, first coil 3515-span 12, second coil 3517-span 12 third coil 3519-span 11, second coil 3517-span 12, first coil 3515-span 12, second coil 3517-span 12 third coil 3519-span 9, second coil 3517-span 12, first coil 3515-span 12, second coil 3517-span 12 third coil 3519-span 13, second coil 3517-span 12, first coil 3515-span 12, second coil 3517 (terminating coil) -span 12.

In comparison with the connection method of the second branch 3560 in the previous example, in the present example, the number of the coil slots 311 spanned by the two straight-line segments 3527 of the start coil of the second branch 3560 is unchanged, and the two straight-line segments 3527 of the start coil are still disposed in the 3 rd coil slot and the 14 th coil slot, respectively. It can be understood that, since the spans of the N second coils 3517 in the present example are 12 coil slots 311, the number of the coil slots 311 where the two straight line segments 3527 of the terminating coil of the second branch 3560 are located is increased by 1, and the two straight line segments 3527 of the terminating coil are respectively disposed in the 4 th coil slot and the 16 th coil slot according to the connection manner of the second branch 3560.

The connection mode of the third branch 3570 specifically includes: third coil 3519 (starting coil) -span 10, second coil 3517-span 12, first coil 3515-span 12, second coil 3517-span 12 third coil 3519-span 11, second coil 3517-span 12, first coil 3515-span 10, second coil 3517-span 12 third coil 3519-span 12, second coil 3517-span 12, first coil 3515-span 10, second coil 3517-span 12 third coil 3519-span 11, second coil 3517-span 12, first coil 3515-span 12, second coil 3517 (terminating coil) -span 12.

In the present example, the number of coil slots 311 spanned by the two straight-line segments 3527 of the start coil of the third branch 3570 is unchanged compared to the connection method of the third branch 3570 in the previous example, and the two straight-line segments 3527 of the start coil are still disposed in the 2 nd coil slot and the 64 th coil slot, respectively. It can be understood that, since the spans of the N second coils 3517 in the present example are 12 coil slots 311, the number of the coil slots 311 where the two straight line segments 3527 of the terminating coil of the third branch 3570 are located is increased by 1, and the two straight line segments 3527 of the terminating coil are respectively disposed in the 3 rd coil slot and the 15 th coil according to the connection manner of the third branch 3570.

In this example, the positions of the first lead-out end 3521 of the start coil of the first branch 3550, the first lead-out end 3521 of the start coil of the second branch 3560, and the first lead-out end 3521 of the start coil of the third branch 3570 are the same as those of the previous example, and will not be described again. The two straight line segments 3527 of the termination coil of the first leg 3550 are distributed in the 5 th and 17 th coil slots, the two straight line segments 3527 of the termination coil of the second leg 3560 are distributed in the 4 th and 16 th coil slots, and the two straight line segments 3527 of the termination coil of the third leg 3570 are distributed in the 3 rd and 15 th coil slots. The second lead-out end 3523 of the first leg 3550, the second lead-out end 3523 of the second leg 3560, and the second lead-out end 3523 of the third leg 3570 are disposed in the 17 th, 16 th, and 15 th coil slots, respectively, which are adjacent.

In the stator assembly 31, the motor 30 and the vehicle 1 provided by the embodiment of the application, the stator assembly 31 comprises a stator core 310 and a winding 350, 72 coil slots 311 are distributed on the inner wall of the stator core 310 along the circumferential direction, the direction from the notch of the coil slots 311 to the slot bottom is the radial direction of the stator core 310, and a plurality of coil layers 313 are arranged on the coil slots 311 from the notch to the slot bottom; the winding 350 includes three parallel branches 351, each branch 351 is formed by sequentially connecting a plurality of coils 3510, each coil 3510 has a start end 3511 and a stop end 3513, and the start end 3511 and the stop end 3513 of the same coil 3510 are located in different coil slots 311; in the same branch 351, the start end 3511 of a coil 3510 is electrically connected to the end 3513 of an adjacent coil 3510 and is stacked on two adjacent coil layers 313; the plurality of coils 3510 include a first coil 3515, a second coil 3517, and a third coil 3519, wherein the first coil 3515 and the third coil 3519 are respectively distributed in the first coil layer 3131 and the bottom coil layer 3133, and all cross over the same layer; the second coil 3517 is located in the coil layer 313 between the first coil layer 3131 and the bottom coil layer 3133, and spans the adjacent two coil layers 313; the beginning and end coils 3510 of each leg 351 are the start coil and the end coil, respectively. The starting ends 3511 of the starting coils of the three legs 351 are all located on the same layer of the coil layer 313 and are located in adjacent coil slots 311, which helps to shorten the distance between the starting ends 3511 of the starting coils of the three legs 351. The terminating ends 3513 of the terminating coils of the three branches 351 are all located on the same layer of the coil layer 313 and located in the adjacent coil slots 311, so that the distance between the terminating ends 3513 of the terminating coils of the three branches 351 is shortened, the connection difficulty between the three branches 351 and other structures can be reduced, and the connection cost is reduced.

In the present application, the terms "mounted," "connected," and the like should be construed broadly unless otherwise specifically indicated or defined. For example, the connection can be fixed connection, detachable connection or integral connection; may be a mechanical connection; the connection may be direct, indirect, or internal, or may be surface contact only, or may be surface contact via an intermediate medium. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for understanding as a specific or particular structure. The description of the terms "some embodiments," "other embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In the present application, the schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples of the present application and features of various embodiments or examples may be combined and combined by those skilled in the art without contradiction.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and they should be included in the protection scope of the present application.

Claims

1. A stator assembly, comprising:

the stator comprises a stator core, wherein 72 coil slots are distributed on the inner wall of the stator core along the circumferential direction, the direction from a notch of each coil slot to the bottom of the slot is the radial direction of the stator core, and a plurality of coil layers are arranged in the direction from the notch to the bottom of the slot; and

the winding comprises three branches connected in parallel, each branch is formed by sequentially connecting a plurality of coils, each coil is provided with a starting end and a terminating end, and the starting end and the terminating end of the same coil are positioned in different coil grooves; in the same branch, the initial end of one coil is electrically connected with the end of the adjacent coil and is overlapped with the two adjacent coil layers; the coils comprise a first coil, a second coil and a third coil, wherein the first coil and the third coil are respectively distributed on a first coil layer and a bottom coil layer and are all spanned by the same layer; the second coil is positioned on the coil layer between the first coil layer and the bottom coil layer and spans two adjacent coil layers;

The coils at the head and the tail of each branch are respectively a start coil and a stop coil, and the start ends of the start coils of the three branches are positioned on the same layer of the coil layers and are positioned in the adjacent coil grooves; the termination ends of the termination coils of the three branches are all located in the same layer of the coil layers and are located in adjacent coil slots.

2. The stator assembly according to claim 1, wherein the coil slots are provided with M coil layers from the slot opening to the slot bottom; each branch is formed by connecting a plurality of first sub-circuits and second sub-circuits, the first sub-circuits are formed by sequentially connecting first coils and N second coils, and the second sub-circuits are formed by sequentially connecting third coils and N second coils; the first sub-path and the second sub-path are connected end to end and are alternately arranged; wherein m=2n+2, n is an integer greater than or equal to 1.

3. The stator assembly of claim 2, wherein the first coil has a span of 10 or 12 of the coil slots;

the spans of the N second coils are 12 coil grooves;

the third coil has a span of 9, 10, 11, 12 or 13 coil slots.

4. The stator assembly of claim 2, wherein the first coil has a span of 10 or 12 of the coil slots;

the span of one second coil in the N second coils is 11 coil grooves, and the spans of the other second coils are 12 coil grooves;

the third coil has a span of 9, 10, 11, 12 or 13 coil slots.

5. The stator assembly according to any one of claims 3 to 4, wherein three of the legs include a first leg connected in the manner: the third coil-the span is 9, the N second coils, the first coil-the span is 12, the N second coils, the third coil-the span is 13, the N second coils, the first coil-the span is 12, the N second coils, the third coil-the span is 12, the N second coils, the first coil-the span is 12, the N second coils, the third coil-the span is 11, the N second coils, the span is 12, the N second coils.

6. The stator assembly of claim 5, wherein three of the legs further comprise a second leg connected in the manner: the third coil-the span is 12, the N second coils, the first coil-the span is 12, the N second coils, the third coil-the span is 11, the N second coils, the first coil-the span is 12, the N second coils, the third coil-the span is 9, the N second coils, the first coil-the span is 12, the N second coils, the third coil-the span is 13, the N second coils, the first coil-the span is 12, the N second coils.

7. The stator assembly of claim 6, wherein three of the legs further comprise a third leg connected in the manner: the third coil-the span is 10, the N second coils, the first coil-the span is 12, the N second coils, the third coil-the span is 11, the N second coils, the first coil-the span is 10, the N second coils, the third coil-the span is 12, the N second coils, the first coil-the span is 10, the N second coils, the third coil-the span is 11, the N second coils, the first coil-the span is 12, the N second coils.

8. The stator assembly of claim 1, wherein the stator assembly comprises three phase windings, the windings being identical in structure for each phase.

9. The stator assembly of claim 1, wherein three of the legs are symmetrical about the magnetic circuit.

10. An electric machine, comprising:

a rotor; and

a stator assembly according to any one of claims 1 to 9.

11. A vehicle, characterized by comprising:

a vehicle body; and

the electric machine of claim 10, the electric machine being mounted to the vehicle body.