WO2023201960A1

WO2023201960A1 - Stator winding and motor

Info

Publication number: WO2023201960A1
Application number: PCT/CN2022/116701
Authority: WO
Inventors: 王朋; 孙韬; 孙明扬; 王昆; 赵德建
Original assignee: 上海纳铁福传动系统有限公司
Priority date: 2022-04-22
Filing date: 2022-09-02
Publication date: 2023-10-26
Also published as: CN114899968A

Abstract

The present invention provides a stator winding and a motor. The stator winding comprises a stator iron core and at least two branch windings. The stator iron core is provided with Z stator slots which are circumferentially distributed; the stator slots are sequentially arranged as a first layer to an N-th layer from inside to outside along the radial direction of the stator core, N being an even number greater than or equal to 4; each branch winding comprises a plurality of coils connected in series in the stator slots, so that a plurality of coils are inserted in each layer of the stator slot; the coils in the first layer and/or the N-th layer of the stator slot are orderly circulated according to the rules of a single full-pitched coil, a single short-pitched coil, a single full-pitched coil, and a single long-pitched coil, and the coils in the rest layers of the stator slot are combined coils. According to the present application, the coils in the first layer and/or the N-th layer of the stator slot are arranged to be of a circulating structure by taking a single full-pitched coil, a single short-pitched coil, a single full-pitched coil, and a single long-pitched coil as a group, so that the inductance and the resistance among the branches can be effectively balanced, and the circulating current among the branches is avoided.

Description

A stator winding and motor

Technical field

The present invention relates to the technical field of vehicle motors, and in particular to a stator winding and a motor including the stator winding.

Background technique

With the rapid development of new energy vehicles, vehicle permanent magnet synchronous motors are gradually moving towards high power density and high speed. Currently, there are many ways to improve power density, and flat wire motors are one of the most commonly used ways. Flat wire stator in flat wire motor With the development of high voltage and high speed, the flat wire stator needs to reduce the circulating current and AC copper loss during the design process, and reduce the winding temperature rise, thereby reducing the size of the motor and increasing the motor power. density. The multi-layer flat wire motor solution design can effectively reduce the AC copper loss of the motor at high speed. As the number of layers increases and the number of parallel branches changes, different winding methods will appear. How to avoid circulation between branches will be an important key technology.

Contents of the invention

In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a stator winding that can effectively avoid circulating currents between branches.

In order to achieve the above object, the present invention provides a stator winding, which includes a stator core and at least two branch windings. The stator core is provided with Z circumferentially distributed stator slots. The stator slots are arranged along the stator core. The radial direction is arranged from the first layer to the Nth layer in sequence from the inside to the outside. N is an even number greater than or equal to 4. Each branch winding includes several coils connected in series in the stator slot, so that each of the stator slots Several coils are plugged into each layer, and the coils in the first layer and/or the Nth layer of the stator slot are ordered according to the rules of single full-pitch coil, single short-pitch coil, single full-pitch coil and single long-pitch coil. cycle, the coils in the remaining layers of the stator slot are all combined coils.

Further, the single full-pitch coil, single short-pitch coil and single long-pitch coil are U-shaped coils;

The U-shaped coil has an integrated structure, and the two ends of the U-shaped coil of the integrated structure are connected in series in the same layer of the stator slot; or, the U-shaped coil is welded by two I-shaped coils; or, The U-shaped coil is a part welded by two cross-layer U-shaped coils, and the two ends of the cross-layer U-shaped coil are connected in series in two adjacent layers of the stator slot.

Further, the pitch of the single full-pitch coil is (Z/2p), the pitch of the single short-pitch coil is (Z/2p)-1, and the pitch of the single long-pitch coil is (Z/ 2p)+1, p is the number of pole pairs of the motor.

Further, the combined coil is a combined concentric coil, and the combined concentric coil includes several coils corresponding to each branch winding and having the same central axis.

Further, there are two branch windings, and the combined concentric coil has two coils; the combined concentric coils of all intermediate layers include a first long-distance coil, and a first long-distance coil located on the inner circumferential side of the first long-distance coil. Short-pitch coil, the pitch of the first long-pitch coil is (Z/2p)+1, the pitch of the first short-pitch coil is (Z/2p)-1, and p is the number of pole pairs of the motor.

Further, there are two branch windings, and the combined concentric coil has two coils; several combined concentric coils of each middle layer are the same; some of the combined concentric coils of the middle layer include the first long-distance coil, And a first short-pitch coil located on the inner circumferential side of the first long-pitch coil, the pitch of the first long-pitch coil is (Z/2p)+1, and the pitch of the first short-pitch coil is (Z/ 2p)-1; The remaining combined concentric coils of the middle layer include a second long-distance coil and a second short-distance coil located on the inner circumferential side of the second long-distance coil. The pitch of the second long-distance coil is ( Z/2p), the pitch of the second short-pitch coil is (Z/2p)-2; p is the number of pole pairs of the motor.

Furthermore, the combined coil is a combined full-pitch coil, and the combined full-pitch coil includes a plurality of stacked single-pitch coils corresponding to each branch winding.

Further, the input and lead wires of each branch winding are distributed on the Nth layer, or the N-1th layer, or the N-2th layer of the stator slot.

The present invention also provides a motor, in which the stator winding as described above is configured.

As mentioned above, the stator winding and motor involved in the present invention have the following beneficial effects:

In this application, the coils in the first layer/or the Nth layer of the stator slot are all arranged in a cyclic structure consisting of a single full-pitch coil, a single short-pitch coil, a single full-pitch coil, and a single long-pitch coil. Effectively balance the inductance and resistance between branches so that the current distribution of each branch is the same and avoid circulating current between branches.

Description of the drawings

Figure 1 is a schematic structural diagram of the stator winding in this application.

Figure 2 is a schematic structural diagram of the stator slot in this application.

Figure 3 is an expanded schematic diagram of the one-phase winding spacing scheme in this application.

Figure 4 is an expanded schematic diagram of the one-phase winding short-distance solution in this application.

Figures 5a to 5c are schematic structural diagrams of a single short-pitch coil, a single full-pitch coil and a single long-pitch coil in this application.

Figure 6 is a schematic structural diagram of the combined concentric coil in this application.

Figure 7 is a schematic structural diagram of the combined full-pitch coil in this application.

Figure 8 is a schematic diagram of the coil formed by the I-type coil in this application.

Figure 9 is a schematic diagram of the U-shaped coil forming the coil in this application.

Component label description

10 Stator core

11 Stator slot

20 single pitch coil

30 single short pitch coil

40 single long distance coil

50 combined concentric coils

51 The first long distance coil

52 The first short distance coil

53 The second long distance coil

54 Second short pitch coil

60 combined full-pitch coils

70 I-shaped coil

80 Cross-layer U-shaped coil

Detailed ways

The implementation of the present invention is described below with specific embodiments. Those familiar with this technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to coordinate with the content disclosed in the specification and are for the understanding and reading of those familiar with this technology. They are not used to limit the conditions for the implementation of the present invention. Therefore, it has no technical substantive significance. Any structural modifications, changes in proportions or adjustments in size shall still fall within the scope of the invention disclosed without affecting the efficacy and purpose of the invention. Within the scope of technical content. At the same time, terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for convenience of description and are not used to limit the scope of the present invention. , changes or adjustments in their relative relationships, provided there is no substantial change in the technical content, shall also be deemed to be within the scope of the present invention.

This application provides a stator winding and a motor including the stator winding. The number of pole pairs p of the motor is 4. The stator winding and the motor having the stator winding are used in new energy vehicles.

As shown in Figures 1 and 2, the stator winding involved in this application includes a stator core 10 and at least two branch windings. The stator core 10 is provided with Z circumferentially distributed stator slots 11. The stator slots 11 are arranged along the stator. The radial direction of the iron core 10 is arranged from the first layer to the Nth layer in sequence from the inside to the outside, and N is an even number greater than or equal to 4. As shown in FIGS. 3 and 4 , each branch winding includes several coils connected in series in the stator slot 11 , so that each layer of the stator slot 11 is inserted with several coils. In this embodiment, Z=48, that is, there are 48 stator slots 11; N=8, that is, there are eight layers of stator slots 11, the first layer of stator slots 11 is the innermost layer, and the eighth layer of stator slots 11 is the innermost layer. The outer layer, the second to seventh layers of the stator slot 11 are intermediate layers, and the intermediate layers are also distributed between the first layer and the Nth layer.

Several coils in each layer of the stator slot 11 form one layer of windings, so the stator slot 11 is provided with eight layers of windings. The pitches of several coils of the eight-layer winding provided in the stator slots 11 are different. The coils are defined as short-pitch coils, full-pitch coils and long-pitch coils according to the pitch size; among them, the short-pitch coil is shown in Figure 5a, and its pitch is (Z/2p)-1=5; the full-pitch coil is as shown in Figure 5a As shown in Figure 5b, its pitch is (Z/2p)=6; as shown in Figure 5c, the long-spacing coil has a pitch of (Z/2p)+1=7.

In particular, in this application, as shown in FIG. 3 or FIG. 4 , the coils in the first layer and/or the eighth layer of the stator slot 11 are arranged in the order of single full-pitch coil 20 , single short-pitch coil 30 , and single full-pitch coil 20 . And the regular and orderly circulation of the single long-distance coil 40, or in other words, the several coils of the first layer winding close to the inner circumference of the stator core 10, and the several coils of the eighth layer winding close to the outer circumference of the stator core 10 are all A cyclic structure consisting of a single full-pitch coil 20, a single short-pitch coil 30, a single full-pitch coil 20, and a single long-pitch coil 40. Based on this: only the coils in the first layer of the stator slots 11 can circulate in a regular and orderly manner in a single full-pitch coil 20, a single short-pitch coil 30, a single full-pitch coil 20, and a single long-pitch coil 40; or, only the stator slots can 11 The coils in the eighth layer circulate in an orderly manner according to the rules of single full-pitch coil 20, single short-pitch coil 30, single full-pitch coil 20 and single long-pitch coil 40; or, the coils in the first and eighth layers of the stator slots The coils all circulate in an orderly manner according to the rules of the single full-pitch coil 20 , the single short-pitch coil 30 , the single full-pitch coil 20 and the single long-pitch coil 40 . In this embodiment, the coils in the first layer and the eighth layer of the stator slots circulate in an orderly manner according to the rules of single full-pitch coil 20 , single short-pitch coil 30 , single full-pitch coil 20 and single long-pitch coil 40 . Wherein, the single full-pitch coil 20 refers to a single full-pitch coil, then the pitch of the single full-pitch coil 20 is (Z/2p)=6; the single short-pitch coil 30 refers to a single short-pitch coil, then the single short-pitch coil 30 The pitch is (Z/2p)-1=5; the single long-pitch coil 40 refers to a single long-pitch coil, so the pitch of the single long-pitch coil 40 is (Z/2p)+1=7. In this way, among the coils on the first and eighth layers of the stator slot 11 , the number of single full-pitch coils 20 is the sum of the number of single short-pitch coils 30 and single long-pitch coils 40 . The coils in the middle layer of the stator slot 11 are all combination coils, and the combination coil is composed of several coils corresponding to each branch winding.

In this application, the coils in the first layer and the Nth layer of the stator slot 11 are arranged into a cyclic structure consisting of a single full-pitch coil 20 , a single short-pitch coil 30 , a single full-pitch coil 20 and a single long-pitch coil 40 . , can effectively balance the inductance and resistance between branches, make the current distribution of each branch the same, avoid circulating current between branches, reduce the winding temperature rise, make the motor smaller and improve the motor power density.

Preferably, the input wires and lead wires of each branch winding are distributed on the eighth layer, or the seventh layer, or the sixth layer of the stator slot 11 , that is, they are arranged close to the outer circumference of the stator core 10 , and the farther away they are, the farther away they are. Excellent, easy to wire.

Furthermore, there are two forms of combined coils: combined concentric coils 50 and combined full-pitch coils 60 . As shown in FIG. 6 , the combined concentric coil 50 includes several coils corresponding to each branch winding and coaxial with the central axis. As shown in Figure 7, the combined full-pitch coil 60 includes a plurality of single full-pitch coils 20 corresponding to each branch winding and wound on top of each other. In this embodiment, there are two branch windings; based on this, the combined concentric coil 50 is composed of two coils with the same central axis; the combined full-pitch coil 60 is composed of two stacked single-spaced coils 20 .

Further, there are two winding schemes in this application: the one-phase winding full-pitch scheme shown in Figure 3, and the one-phase winding short-pitch scheme shown in Figure 4, and in these two winding schemes, the middle layer of the stator slot 11 The coils plugged in are all combined concentric coils 50. In the one-phase winding pitch scheme shown in Figure 3, the conductors of different layers in the same stator slot 11 are of the same phase; based on this, the combined concentric coils 50 of all intermediate layers have the same structure and include the first long-distance coil 51 , and the first short-distance coil 52 located on the inner circumferential side of the first long-distance coil 51; wherein the first long-distance coil 51 is a long-distance coil, and the pitch of the first long-distance coil 51 is (Z/2p) +1=7; the first short-pitch coil 52 is a short-pitch coil, and the pitch of the first short-pitch coil 52 is (Z/2p)-1=5. In the one-phase winding short-distance scheme shown in Figure 4, the conductors of different layers in the same stator slot 11 can be of different phases; based on this, the several combined concentric coils 50 of each intermediate layer are the same; however, some of the intermediate layers The combined concentric coil 50 includes a first long-distance coil 51 and a first short-distance coil 52 located on the inner circumferential side of the first long-distance coil 51. The pitch of the first long-distance coil 51 is (Z/2p)+1= 7. The pitch of the first short-distance coil 52 is (Z/2p)-1=5; while the remaining intermediate layer combined concentric coils 50 include the second long-distance coil 53 and are located in the second long-distance coil 53 The pitch of the second short-pitch coil 54 on the peripheral side, the second long-pitch coil 53 is (Z/2p)=6, and the pitch of the second short-pitch coil 54 is (Z/2p)-2=4, then: The span of the combined concentric coil 50 formed by the second long-pitch coil 53 and the second short-pitch coil 54 is reduced. The one-phase winding full-pitch scheme and the one-phase winding short-pitch scheme are described below, and the 48 stator slots 11 are numbered No. 1 to No. 48 in sequence.

One-phase winding spacing scheme: As shown in Figure 3, the top layer is the first layer of the stator slots 11, and the bottom layer is the eighth layer of the stator slots 11. One of the branch windings according to the series connection direction is from input No. 37 on the first layer, span No. 43 on the second layer to No. 2 on the third layer, span No. 8 on the fourth layer to No. 13 on the fifth layer, The sixth floor spans from No. 19 to the seventh floor No. 26, the eighth floor spans from No. 32 to the eighth floor No. 26, the seventh floor spans from No. 20 to the sixth floor No. 13, and the fifth floor spans from No. 7 span to No. 2 on the fourth floor, span from No. 44 to No. 37 on the second floor, span No. 31 to No. 26 on the first floor, and span No. 32 to No. 26 on the second floor. No. 37 on the third floor, span No. 43 on the fourth floor to No. 2 on the fifth floor, span No. 8 on the sixth floor to No. 13 on the seventh floor, and span No. 19 on the eighth floor to No. 13 on the eighth floor. The seventh floor spans from No. 7 to No. 2 on the sixth floor, the fifth floor spans from No. 44 to No. 37 on the fourth floor, the third floor spans from No. 31 to No. 26 on the second floor, and the first floor spans from No. 20 span to No. 13 on the first floor, span from No. 19 to No. 26 on the second floor, span No. 32 to No. 37 on the fourth floor, and span No. 43 to No. 37 on the sixth floor. No. 2 on the seventh floor, span No. 8 on the eighth floor to No. 2 on the eighth floor, span No. 44 on the seventh floor to No. 37 on the sixth floor, span No. 31 on the fifth floor to No. 26 on the fourth floor, The third floor spans from No. 20 to No. 13 on the second floor, the first floor spans from No. 7 to No. 2 on the first floor, the second floor spans from No. 8 to No. 13 on the third floor, and the fourth floor spans from No. 19 No. 26 on the fifth floor, No. 32 on the sixth floor to No. 37 on the seventh floor, No. 43 on the eighth floor to No. 37 on the eighth floor, and No. 31 on the seventh floor on the seventh floor. No. 26 on the sixth floor, span No. 20 on the fifth floor to No. 13 on the fourth floor, span No. 7 on the third floor to No. 2 on the second floor, and leading from No. 44 on the first floor.

The other branch winding, according to the series connection direction, is from input No. 38 on the first layer, spans from No. 44 on the second layer to No. 1 on the third layer, and spans from No. 7 on the fourth layer to No. 14 on the fifth layer. , the sixth floor spans from No. 20 to the seventh floor, No. 25, the eighth floor spans from No. 31 to the eighth floor, No. 38, the seventh floor spans from No. 32 to the sixth floor, No. 25, the fifth floor spans from Span No. 19 to No. 14 on the fourth floor, span No. 8 on the third floor to No. 1 on the second floor, span No. 43 on the first floor to No. 1 on the first floor, and span No. 7 on the second floor. No. 14 on the third floor, span from No. 20 on the fourth floor to No. 25 on the fifth floor, span No. 31 on the sixth floor to No. 38 on the seventh floor, and span No. 44 on the eighth floor to No. 1 on the eighth floor. , the seventh floor spans from No. 43 to the sixth floor, No. 38, the fifth floor spans from No. 32 to the fourth floor, No. 25, the third floor spans from No. 19 to the second floor, No. 14, the first floor spans from Span No. 8 to No. 14 on the first floor, span No. 20 on the second floor to No. 25 on the third floor, span No. 31 on the fourth floor to No. 38 on the fifth floor, and span No. 44 on the sixth floor. No. 1 on the seventh floor, span No. 7 on the eighth floor to No. 14 on the eighth floor, span No. 8 on the seventh floor to No. 1 on the sixth floor, and span No. 43 on the fifth floor to No. 38 on the fourth floor. , The third floor spans from No. 32 to No. 25 on the second floor, the first floor spans from No. 19 to No. 25 on the first floor, the second floor spans from No. 31 to No. 38 on the third floor, and the fourth floor spans from Span No. 44 to No. 1 on the fifth floor, span No. 7 on the sixth floor to No. 14 on the seventh floor, span No. 20 on the eighth floor to No. 25 on the eighth floor, and span No. 19 on the seventh floor. No. 14 on the sixth floor, span No. 8 on the fifth floor to No. 1 on the fourth floor, span No. 43 on the third floor to No. 38 on the second floor, and lead from No. 32 on the first floor.

One-phase winding short-pitch solution: As shown in Figure 4, the top layer is the first layer of the stator slots 11, and the bottom layer is the eighth layer of the stator slots 11. One of the branch windings according to the series connection direction is from input No. 37 on the first layer, span No. 43 on the second layer to No. 2 on the third layer, span No. 8 on the fourth layer to No. 12 on the fifth layer, The sixth floor spans from No. 18 to No. 25 on the seventh floor, the eighth floor spans from No. 31 to No. 25 on the eighth floor, the seventh floor spans from No. 19 to No. 12 on the sixth floor, and the fifth floor spans from No. 6 span to No. 2 on the fourth floor, span from No. 44 to No. 37 on the second floor, span No. 31 to No. 26 on the first floor, and span No. 32 to No. 26 on the second floor. No. 37 on the third floor, span No. 43 on the fourth floor to No. 1 on the fifth floor, span No. 7 on the sixth floor to No. 12 on the seventh floor, and span No. 18 on the eighth floor to No. 12 on the eighth floor. The seventh floor spans from No. 6 to No. 1 on the sixth floor, the fifth floor spans from No. 43 to No. 37 on the fourth floor, the third floor spans from No. 31 to No. 26 on the second floor, and the first floor spans from No. 20 span to No. 13 on the first floor, span from No. 19 to No. 26 on the second floor, span No. 32 to No. 36 on the fourth floor, and span No. 42 to No. 36 on the sixth floor. No. 1 on the seventh floor, span No. 7 on the eighth floor to No. 1 on the eighth floor, span No. 43 on the seventh floor to No. 36 on the sixth floor, span No. 30 on the fifth floor to No. 26 on the fourth floor, The third floor spans from No. 20 to No. 13 on the second floor, the first floor spans from No. 7 to No. 2 on the first floor, the second floor spans from No. 8 to No. 13 on the third floor, and the fourth floor spans from No. 19 span to No. 25 on the fifth floor, span from No. 31 to No. 36 on the seventh floor, span No. 42 to No. 36 on the eighth floor, and span No. 30 to No. 36 on the seventh floor. No. 25 on the sixth floor, span No. 19 on the fifth floor to No. 13 on the fourth floor, span No. 7 on the third floor to No. 2 on the second floor, and leading from No. 44 on the first floor.

The other branch winding, according to the series connection direction, is from input No. 38 on the first layer, spans from No. 44 on the second layer to No. 1 on the third layer, and spans from No. 7 on the fourth layer to No. 13 on the fifth layer. , the sixth floor spans from No. 19 to the seventh floor, No. 24, the eighth floor spans from No. 30 to the eighth floor, No. 37, the seventh floor spans from No. 31 to the sixth floor, No. 24, the fifth floor spans from Span No. 18 to No. 14 on the fourth floor, span No. 8 on the third floor to No. 1 on the second floor, span No. 43 on the first floor to No. 1 on the first floor, and span No. 7 on the second floor. No. 14 on the third floor, span No. 20 on the fourth floor to No. 24 on the fifth floor, span No. 30 on the sixth floor to No. 37 on the seventh floor, and span No. 43 on the eighth floor to No. 48 on the eighth floor. , the seventh floor spans from No. 42 to the sixth floor, No. 37, the fifth floor spans from No. 31 to the fourth floor, No. 25, the third floor spans from No. 19 to the second floor, No. 14, the first floor spans from Span No. 8 to No. 14 on the first floor, span No. 20 on the second floor to No. 25 on the third floor, span No. 31 on the fourth floor to No. 37 on the fifth floor, and span No. 43 on the sixth floor. No. 48 on the seventh floor, span from No. 6 on the eighth floor to No. 13 on the eighth floor, span No. 7 on the seventh floor to No. 48 on the sixth floor, span No. 42 on the fifth floor to No. 38 on the fourth floor. , The third floor spans from No. 32 to No. 25 on the second floor, the first floor spans from No. 19 to No. 25 on the first floor, the second floor spans from No. 31 to No. 38 on the third floor, and the fourth floor spans from Span No. 44 to No. 48 on the fifth floor, span No. 6 on the sixth floor to No. 13 on the seventh floor, span No. 19 on the eighth floor to No. 24 on the eighth floor, and span No. 18 on the seventh floor. No. 13 on the sixth floor, span No. 7 on the fifth floor to No. 1 on the fourth floor, span No. 43 on the third floor to No. 38 on the second floor, and lead from No. 32 on the first floor.

In the embodiment shown in Figures 3 and 4, No. 37 and No. 38 on the first layer are input interfaces; of course, in other embodiments, any two adjacent interfaces on the first layer can be selected as input interfaces.

Further, the single full-pitch coil 20 , the single short-pitch coil 30 and the single long-pitch coil 40 in the first and Nth layers of the stator slot 11 are all U-shaped coils. Of course, the combination concentricity in the middle layer of the stator slot 11 The first long-pitch coil 51, the first short-pitch coil 52, the second long-pitch coil 53 and the second short-pitch coil 54 of the coil 50, as well as the single full-pitch coil 20 constituting the combined full-pitch coil 60 are also U-shaped coils. . In this application, there are three structural forms of U-shaped coils:

1. The U-shaped coil has an integrated structure, and the two ends of the U-shaped coil of the integrated structure are connected in series in the same layer of the stator slot 11.

2. As shown in Figure 7, the U-shaped coil is welded by two I-shaped coils 40. Both ends of each I-shaped coil 40 are welding ends. By welding the ends of the two I-shaped coils 40, it can be The single long-pitch coil and the single short-pitch coil 20 make up the first and eighth layers, or the coils make up the middle layer.

3. As shown in Figure 8, the U-shaped coil is a part welded by two cross-layer U-shaped coils 50. Both ends of the cross-layer U-shaped coil 50 are welding ends, and both ends of the cross-layer U-shaped coil 50 are welded. The ends are connected in series in the two adjacent layers of the stator slot 11, then the cross-layer U-shaped coil 50 that constitutes the first layer of U-shaped coils is connected in series in the first and second layers of the stator slot 11, forming the eighth layer of U-shaped coils. The cross-layer U-shaped coil 50 is connected in series in the eighth and seventh layers of the stator slot 11 . In addition, the number of U-shaped coils can be reduced to reduce process manufacturing costs.

To sum up, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

The above embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

A stator winding includes a stator core (10) and at least two branch windings. The stator core (10) is provided with Z circumferentially distributed stator slots (11). The stator slots (11) The first layer to the Nth layer are arranged in sequence from the inside to the outside along the radial direction of the stator core (10). N is an even number greater than or equal to 4. Each branch winding includes several windings connected in series in the stator slot (11). The coils in the stator slot (11) are connected with several coils in each layer, and the characteristic is that the coils in the first layer and/or the Nth layer of the stator slot (11) are all in single pitch. Regular and orderly circulation of coils (20), single short-pitch coils (30), single full-pitch coils (20) and single long-pitch coils (40), and the coils in the remaining layers of the stator slot (11) are all combined coils .
The stator winding according to claim 1, characterized in that: the single full-pitch coil (20), single short-pitch coil (30) and single long-pitch coil (40) are U-shaped coils;

The U-shaped coil has an integrated structure, and the two ends of the U-shaped coil of the integrated structure are connected in series in the same layer of the stator slot (11); or, the U-shaped coil is composed of two I-shaped coils (40) Welded; or, the U-shaped coil is a part welded by two cross-layer U-shaped coils (50), and the two ends of the cross-layer U-shaped coil (50) are connected in series to the stator slot (11 ) in two adjacent floors.
The stator winding according to claim 1, characterized in that: the pitch of the single full-pitch coil (20) is (Z/2p), and the pitch of the single short-pitch coil (30) is (Z/2p). )-1, the pitch of the single long-pitch coil (40) is (Z/2p)+1, and p is the number of pole pairs of the motor.
The stator winding according to claim 1, characterized in that the combined coil is a combined concentric coil (50), and the combined concentric coil (50) includes a plurality of coils corresponding to each branch winding and coaxial with the central axis.
The stator winding according to claim 3, characterized in that: there are two branch windings, and the combined concentric coil (50) has two coils; all the combined concentric coils (50) of the intermediate layer include a first The long-distance coil (51), and the first short-distance coil (52) located on the inner circumferential side of the first long-distance coil (51), the pitch of the first long-distance coil (51) is (Z/2p)+ 1. The pitch of the first short-pitch coil (52) is (Z/2p)-1, and p is the number of pole pairs of the motor.
The stator winding according to claim 3, characterized in that: there are two branch windings, and the combined concentric coil (50) has two coils; several combined concentric coils (50) in each middle layer The same; some of the combined concentric coils (50) of the middle layer include a first long-distance coil (51) and a first short-distance coil (52) located on the inner circumferential side of the first long-distance coil (51). The pitch of the long-distance coil (51) is (Z/2p)+1, and the pitch of the first short-distance coil (52) is (Z/2p)-1; the rest of the intermediate layer's combined concentric coils (50 ) both include a second long-distance coil (53) and a second short-distance coil (54) located on the inner circumferential side of the second long-distance coil (53). The pitch of the second long-distance coil (53) is ( Z/2p), the pitch of the second short-pitch coil (54) is (Z/2p)-2; p is the number of pole pairs of the motor.
The stator winding according to claim 1, characterized in that: the combined coil is a combined full-pitch coil (60), and the combined full-pitch coil (60) includes a plurality of overlapping single-pitch coils corresponding to each branch winding. distance coil (20).
The stator winding according to claim 1, characterized in that: the input and lead wires of each branch winding are distributed on the Nth layer, or the N-1th layer, or the N-2th layer of the stator slot (11). layer.
A motor, characterized in that: the motor is equipped with the stator winding according to any one of claims 1-8.