Short-distance winding stator and motor

Abstract

The invention discloses a short-distance winding stator and a motor, the short-distance winding stator comprises a stator winding and a stator core, the stator core comprises a plurality of stator slots, and each stator slot comprises 2N accommodating layers; the stator winding comprises a multi-phase winding structure, each phase winding structure comprises two parallel coil groups, each coil group comprises multiple coil structures with different spans and two lead structures, each coil structure comprises two connected coil conductor edges, and the two coil conductor edges are respectively inserted into adjacent accommodating layers of different stator slots; the plurality of coil structures of each coil group are sequentially wound from the first layer to the 2Nth layer of the accommodating layer; the two lead structures are arranged at the two ends of the corresponding coil assembly respectively and inserted into the first containing layer and the 2Nth containing layer, and the lead structures extend out from the crown end of the stator winding. According to the short-distance winding stator and the motor, the processing technology difficulty of the welding end is reduced, the axial size of the motor is reduced, the creepage distance is ensured, and motor arrangement is facilitated.

Description

Technical Field

[0001] The present application belongs to the field of motor technology, and in particular relates to a short-pitch winding stator and a motor. Background Art

[0002] In the stator of the motor, the winding can be divided into short-pitch winding and full-pitch winding according to the relationship between the winding span and the motor slot pitch. The use of short-pitch winding can further reduce the torque pulsation and NVH (Noise, Vibration and Harshness) of the motor.

[0003] At present, in the existing short-distance winding scheme, the wires are usually connected at the welding end and the copper busbars are connected. However, since each coil has a different twist span at the welding end, the twist efficiency is low, resulting in a complicated process. In addition, the wires at the welding end are not conducive to the flattening and welding of the flat wire coils. In addition, improper design of the wire position and the copper busbar will lead to multiple layers of stacking, resulting in an overly large axial size of the motor as a whole. For compact motors, it will affect the creepage distance, resulting in insulation safety risks for the motor. Summary of the invention

[0004] The present application provides a short-pitch winding stator and motor, which reduces the difficulty of the processing technology of the welding end by designing different span line types, and reduces the axial size of the motor by optimizing the lead-out position and performing reasonable copper busbar design, and ensures sufficient creepage distance, which is beneficial to the motor layout.

[0005] The present application provides a short-pitch winding stator, which includes a stator winding and a stator core, the stator core includes a plurality of stator slots, each of the stator slots includes 2N layers of accommodation layers; the stator winding includes a multi-phase winding structure, each phase winding structure includes two parallel coil groups, each coil group includes a plurality of coil structures with different spans and two lead structures, the coil structure includes two connected coil conductor sides, the two coil conductor sides are respectively inserted into adjacent accommodation layers of different stator slots, and the plurality of coil structures of each coil group are sequentially wound from the first layer of the accommodation layer to the 2N layer; the two lead structures are respectively arranged at the two ends of the corresponding coil group and inserted into the first layer and the 2N layer of the accommodation layer, and the lead structure extends out at the crown end of the stator winding.

[0006] As shown in the above short-pitch winding stator, each coil group includes three coil structures with spans of Y-1, Y and Y+2. In the 2i layer and the 2i-1 layer containing layer, the three coil structures with spans of Y-1, Y and Y+2 are interconnected to form a coil layer; between the 2i layer and the 2i+1 layer containing layer, adjacent coil layers are connected by a coil structure with a span of Y-1.

[0007] As for the short-pitch winding stator as above, the lead structures at both ends of each coil group are respectively an incoming terminal and an outgoing terminal, and the number of stator slots spaced between the incoming terminal and the outgoing terminal of each coil group is Y-1.

[0008] As above, the short-pitch winding stator, wherein the two parallel coil groups are respectively the first coil group and the second coil group, the incoming terminal of the first coil group and the incoming terminal of the second coil group are respectively arranged in the 1st and 2Nth containing layers, the outgoing terminal of the second coil group and the outgoing terminal of the first coil group are respectively arranged in the 1st and 2Nth containing layers, the number of interval slots between the incoming terminals of each first coil group is Y-4, and the number of interval slots between the incoming terminals of each second coil group is Y-4.

[0009] As above, the short-pitch winding stator, wherein the lead structure includes a first conductive connection part, a lead conductor edge and a second conductive connection part connected to each other, the lead conductor edge is inserted into the stator slot, the first conductive connection part and the second conductive connection part are both twisted head structures obliquely connected to the lead conductor edge, the first conductive connection part is used to connect the coil structure, and the second conductive connection part is used to connect an external circuit.

[0010] As above, the short-pitch winding stator, wherein the stator winding also includes a copper bar assembly, the copper bar assembly includes a first connecting copper bar and a second connecting copper bar, the lead structures are respectively an incoming terminal and an outgoing terminal, the two incoming terminals of each phase winding structure are connected through the first connecting copper bar, and the first connecting copper bars are arranged at intervals, and all the outgoing terminals of the multi-phase winding structure are connected through the second connecting copper bar, and the first connecting copper bars and the second connecting copper bars are arranged at intervals.

[0011] The short-pitch winding stator as above, wherein the first connecting copper bar includes a first connecting plate, a first lead-out end and a second lead-out end connected to each other, the first connecting plate extends along the circumferential direction of the stator winding, the first lead-out end and the second lead-out end both extend along the axial direction of the stator winding, and are respectively used to connect the incoming terminal and the external circuit, the second connecting copper bar includes a second connecting plate and a third lead-out end connected to each other, the second connecting plate extends along the circumferential direction of the stator winding, the third lead-out end extends along the axial direction of the stator winding, and is used to connect the outgoing terminal, the first connecting plate and the second connecting plate are spaced apart in the axial direction, and at least part of the first connecting plate is at the same height in the axial direction.

[0012] In the short-pitch winding stator as above, the second conductive connection portion of the lead structure in the 1st accommodating layer and the second conductive connection portion of the lead structure in the 2Nth accommodating layer are twisted in opposite directions, and the second conductive connection portions of the two layers are twisted in directions close to each other.

[0013] As above, the short-pitch winding stator, wherein the stator core includes 54 stator slots distributed along the circumferential direction, the stator winding includes a 3-phase winding structure, and the pole pair number of the short-pitch winding stator is 3; in the 2i and 2i-1 accommodating layers, three coil structures with spans of 9, 10 and 12 are interconnected to form a coil layer, and in one coil layer, the spans of multiple coil structures form a span combination of 9, 10, 10, 10, 10, 10, 10 and 12; between the 2i and 2i+1 accommodating layers, adjacent coil layers are connected by a coil structure with a span of 9.

[0014] On the other hand, the present application also provides a motor, which includes the above-mentioned short-pitch winding stator.

[0015] The short-pitch winding stator of the present application includes a stator winding and a stator core. The stator winding includes a multi-phase winding structure. Each phase winding structure includes two parallel coil groups to form two parallel branches of each phase. Each coil group includes a plurality of coil structures with different spans and two lead structures. The two coil conductor edges of the coil structure are respectively inserted into adjacent accommodating layers in two stator slots of the stator core, so that each coil group can be wound sequentially from the 1st layer to the 2Nth layer of the accommodating layer, thereby forming a complete current path to realize motor winding. The two lead structures are respectively arranged at the two ends of the corresponding coil groups and plugged into the 1st and 2Nth layers of the containing layers, and are connected to the head and tail ends of the multiple coil structures connected in sequence to input and output current. Since the structures of the multiple lead structures are exactly the same and are all plugged into the 1st and 2Nth layers of the containing layers, when the multiple lead structures extend from the crown end of the stator winding, they can form a neat arrangement, and through the linear design with different spans, the twisting span of the welding end is guaranteed to be the same, reducing the difficulty of the processing technology of the welding end, and when connecting the copper busbar, there is no need to perform a complicated multi-layer copper busbar setting, thereby reducing the overall axial size of the motor and ensuring sufficient creepage distance, which is beneficial to the overall layout of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 This is a schematic diagram of the overall structure of the short-pitch winding stator of an embodiment of the present application;

[0018] Figure 2 This is a schematic diagram of the connection between the lead structure and the copper bar assembly of the short-pitch winding stator of the embodiment of the present application;

[0019] Figure 3This is a schematic structural diagram of a lead structure of a short-pitch winding stator according to an embodiment of the present application;

[0020] Figure 4 A schematic structural diagram of a coil structure of a short-pitch winding stator according to an embodiment of the present application;

[0021] Figure 5 This is a schematic diagram of the connection between two coil groups of a one-phase winding structure of a short-pitch winding stator according to an embodiment of the present application.

[0022] Description of Figure Numbers:

[0023] 100, stator winding; 200, stator core; 210, stator slot;

[0024] 10. Winding structure; 20. Coil group; 201. First coil group; 202. Second coil group; 21. Coil layer; 30. Coil structure; 31. Coil conductor edge; 32. Lead structure; 321. Inlet terminal; 322. Outlet terminal; 323. First conductive connection part; 324. Lead conductor edge; 325. Second conductive connection part; 326. Inclined connection part; 327. Copper busbar connection part; 40. Welding end; 50. Crown end; 60. Copper busbar assembly; 61. First connecting copper busbar; 611. First connecting plate; 612. First lead-out terminal; 613. Second lead-out terminal; 62. Second connecting copper busbar; 621. Second connecting plate; 622. Third lead-out terminal. DETAILED DESCRIPTION

[0025] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0026] In the current automotive industry, the stator of the motor usually adopts the matching scheme of 54 slots and 6 poles and 48 slots and 8 poles. Compared with the 48 slots and 8 poles motor, the 54 slots and 6 poles motor has higher high-speed and low-torque efficiency. In addition, the 54 slots and 6 poles motor has more stator slots and smaller stator slots, so the size of the flat wire set in the slot is smaller, which can reduce the AC copper loss and further improve the efficiency in the high-speed zone. In addition, the number of slots per pole and per phase of the 54 slots and 6 poles motor is increased from 2 to 3, and the NVH (Noise, Vibration and Harshness) performance is also better.

[0027] In the stator slots of the motor, windings need to be wound. According to the relationship between the winding span and the motor slot pitch, the windings can be divided into short-pitch windings and full-pitch windings. In the three-phase winding line voltage, there is no third harmonic, so the fifth and seventh harmonics are mainly eliminated. Through calculation, the approximate span of 5 or 6 times the full pitch can be used to eliminate the fifth and seventh harmonics. This span is called short pitch. For example, for a 54-slot 6-pole scheme, the full pitch is 9 and the short pitch is 8. The use of short-pitch windings can further reduce the torque pulsation and NVH (Noise, Vibration and Harshness) of the motor.

[0028] In the existing technical solutions, the wires are usually connected at the welding end and the copper bars are connected. However, since each coil has a different twist span at the welding end, the copper bars will be stacked in multiple layers, causing the overall axial size of the motor to be too large, affecting the creepage distance of the motor, and ultimately leading to safety problems. In order to solve this technical problem, the present application designs a stator structure inside a 54-slot 6-pole motor, and proposes a short-pitch winding stator and motor. The following are embodiments of the short-pitch winding stator and motor.

[0029] like Figures 1 to 5 As shown, the present application provides a short-pitch winding stator, which includes a stator winding 100 and a stator core 200, the stator core 200 includes a plurality of stator slots 210, and each stator slot 210 includes 2N layers of accommodation layers; the stator winding 100 includes a multi-phase winding structure 10, each phase winding structure 10 includes two parallel coil groups 20, each coil group 20 includes a plurality of coil structures 30 with different spans and two lead structures 32, the coil structure 30 includes two connected coil conductor sides 31, the two coil conductor sides 31 are respectively inserted into adjacent accommodation layers of different stator slots 210, and the plurality of coil structures 30 of each coil group 20 are sequentially wound from the first layer of the accommodation layer to the 2N layer; the two lead structures 32 are respectively arranged at both ends of the corresponding coil group 20 and inserted into the first layer and the 2N layer of the accommodation layer, and the lead structure 32 extends out at the crown end 50 of the stator winding 100.

[0030] like Figure 1 and Figure 2 As shown, in the embodiment of the present application, the stator core 200 includes 54 stator slots 210 distributed along the circumferential direction, the stator winding 100 includes a 3-phase winding structure 10, and the number of pole pairs of the short-pitch winding stator is 3, so the number of slots per pole per phase is q is 3. In addition, the number of accommodating layers in the stator slot 210 can be 6, 8 or 10 layers, and specifically 8 layers in the embodiment of the present application.

[0031] Each phase winding structure 10 includes two coil groups 20 connected in parallel. In the entire stator winding 100, there are 6 coil groups 20, namely U1, U2, V1, V2, W1, and W2. Among them, the 6 coil groups 20 all have a first end and a second end. The first ends of the two parallel coil groups 20 in each phase winding structure 10 are connected to form the input end of each phase winding structure 10; the second ends of the 6 coil groups 20 are connected to a point to form the input end of each phase winding structure 10. The connection point is a neutral point, thereby forming a star connection of the three-phase winding structure 10.

[0032] The stator winding 100 has a welding end 40 and a crown end 50, that is, the coil structure 30 has a welding end 40 and a crown end 50, and the two coil conductor sides 31 of the coil structure 30 are connected at the crown end 50, and the welding end 40 is connected to the coil structures 30 on both sides through the twisting structures extending in opposite directions. At the welding end 40, the twisting span of the twisting structure of each coil structure 30 is 8, which can be neatly arranged, and there is no reverse twisting structure, thereby reducing the process difficulty of the welding end 40.

[0033] In specific implementation, the short-distance winding stator of the present application includes a stator winding 100 and a stator core 200. The stator winding 100 includes a multi-phase winding structure 10. Each phase winding structure 10 includes two parallel coil groups 20 to form two parallel branches of each phase. Each coil group 20 includes a plurality of coil structures 30 with different spans and two lead structures 32. The two coil conductor edges 31 of the coil structure 30 are respectively inserted into the adjacent accommodation layers in the two stator slots 210 of the stator core 200, so that each coil group 20 can be wound from the first layer of the accommodation layer to the 2Nth layer in sequence, thereby forming a complete current path and realizing motor winding. The two lead structures 32 are respectively arranged at the two ends of the corresponding coil group 20 and inserted into the accommodation layers of the first layer and the 2Nth layer, and are connected to the head and tail ends of the plurality of coil structures 30 connected in sequence to form the input and output ends of each coil group 20 for current input and output.

[0034] Since the structures of the multiple lead structures 32 are exactly the same and are all inserted into the 1st and 2Nth containing layers, when the multiple lead structures 32 extend from the crown end 50 of the stator winding 100, they can form a neat arrangement. Therefore, when using copper bars to connect the input ends of the coil groups 20 of the same phase and the output ends of all coil groups respectively, there is no need to perform a complicated multi-layer copper bar setting, thereby reducing the overall axial size of the motor, ensuring sufficient creepage distance, and facilitating the overall layout of the motor.

[0035] The short-pitch winding stator of the embodiment of the present application, wherein each coil group 20 includes three coil structures 30 with spans of Y-1, Y and Y+2, and in the 2i layer and the 2i-1 layer containing layer, the three coil structures 30 with spans of Y-1, Y and Y+2 are interconnected to form a coil layer 21; between the 2i layer and the 2i+1 layer containing layer, adjacent coil layers 21 are connected by a coil structure 30 with a span of Y-1. By adopting such an arrangement and winding method of the coil structure 30, the coil group 20 can be wound from the 1st layer to the 2Nth layer as a whole to form a complete current path, and avoid conflicts between coil groups 20 of different phases or coil groups 20 of different groups in the same phase during the winding process.

[0036] Specifically, in the 2i and 2i-1 accommodating layers, three coil structures 30 with spans of 9, 10 and 12 are interconnected and form a coil layer 21. In one coil layer 21, the spans of multiple coil structures 30 form a span combination of 9, 10, 10, 10, 10, 10, 10 and 12; between the 2i and 2i+1 accommodating layers, adjacent coil layers 21 are connected by a coil structure 30 with a span of 9.

[0037] In one coil layer 21, there are three groups of coil structures 30, each group of coil structures 30 has three coil structures 30 arranged in continuous stator slots 210, or has two coil structures 30 and one lead structure 32 arranged in continuous stator slots 210. Among the three groups of coil structures 30, the spans of the six coil structures 30 in two groups are both 10, and the spans of the two coil structures 30 in the third group are 9 and 12 respectively. Moreover, in the third group, if the third structure is a coil structure 30, the coil structure 30 spans the 2i-th layer and the 2i+1-th layer of the accommodation layer to achieve cross-layer connection, and the span of this coil structure 30 is also 9; if the third structure is a lead structure 32, one end of the lead structure 32 can extend from the crown end 50 to connect to the external circuit.

[0038] Taking the U-phase winding structure 10 as an example, Figure 5The diagram shows the arrangement and connection of the two coil groups 20 of the U-phase winding structure 10 in the first two layers of the stator slot 210. The U1 coil group 20 is in a coil layer 21. The three coil structures 30 are respectively inserted into the 8th, 9th, 10th, 26th, 27th, 28th, 44th, 45th, and 46th slots of the second layer, and correspondingly pass out from the 18th, 19th, 20th, 36th, 37th, 38th, and 2nd slots of the first layer, the 54th slot of the third layer, and the 1st slot of the first layer. The 54th slot of the first layer is provided with a lead structure 32. One end of the lead structure 32 is connected to the 8th slot. The inner coil structure 30 is connected to the twist structure of the welding end 40, and the other end of the lead structure 32 is connected to the external circuit for inputting the U-phase current; each group of coil structures 30 of the U2 coil group 20 has a 6-slot interval with each group of coil structures 30 of the U1 coil group 20, so that the V1 coil group 20 and the W1 coil group 20 can be arranged between the U1 coil group 20 and the U2 coil group 20, and in the first and second layers of the U2 coil group 20, there is also a lead structure 32, which is used to output the U-phase current. It should be noted that the specific setting position of the above-mentioned coil structure 30 is only for example, and the position can be changed and the coil structure 30 can be wound according to actual needs.

[0039] like Figure 5 As shown, the short-pitch winding stator of the embodiment of the present application, wherein the lead structures 32 at both ends of each coil group 20 are respectively an input terminal 321 and an output terminal 322, and the number of stator slots 210 spaced between the input terminal 321 and the output terminal 322 of each coil group 20 is Y-1.

[0040] The lead structures 32 at both ends of each coil group 20 are respectively an incoming terminal 321 and an outgoing terminal 322. In the six coil groups 20 of the three-phase winding structure 10, the incoming terminals 321 are respectively U1+, U2+, V1+, V2+, W1+, and W2+, and the outgoing terminals 322 are respectively U1-, U2-, V1-, V2-, W1-, and W2-. Among them, U1+, U2-, V1+, V2-, W1+, and W2- are arranged in the first layer, i.e., the innermost layer; U1-, U2+, V1-, V2+, W1-, and W2+ are arranged in the 2Nth layer, i.e., the outermost layer. It should be noted that the positions of the innermost and outermost lead structures 32 are not limited to the above description, and the positions of the two can be interchangeably set, and each coil group 20 can also be rearranged and wound according to the position of the lead structure 32.

[0041] The number of stator slots 210 between the incoming terminal 321 and the outgoing terminal 322 of each coil group 20 is Y-1. In the embodiment of the present application, the number of slots is 9, so that the incoming terminal 321 and the outgoing terminal 322 of the same coil group 20 are arranged relatively close to each other, so that the lead structures 32 of multiple coil groups 20 can be arranged in a centralized manner, thereby facilitating the use of copper bars for connection, which is beneficial to reducing the number of copper bar stacking layers and optimizing the overall longitudinal space of the motor.

[0042] like Figure 5 As shown, the short-pitch winding stator of the embodiment of the present application, wherein the two parallel coil groups 20 are respectively a first coil group 201 and a second coil group 202, the incoming terminal 321 of the first coil group 201 and the incoming terminal 321 of the second coil group 202 are respectively arranged in the 1st layer and the 2Nth layer of the accommodation layer, the outgoing terminal 322 of the second coil group 202 and the outgoing terminal 322 of the first coil group 201 are respectively arranged in the 1st layer and the 2Nth layer of the accommodation layer, the number of interval slots between the incoming terminals 321 of each first coil group 201 is Y-4, and the number of interval slots between the incoming terminals 321 of each second coil group 202 is Y-4.

[0043] The first coil group 201 includes the U1 coil group 20 , the V1 coil group 20 and the W1 coil group 20 , and the second coil group 202 includes the U2 coil group 20 , the V2 coil group 20 and the W2 coil group 20 .

[0044] In specific implementation, the number of slots between the incoming terminals 321 of each first coil group 201 is set to Y-4, and the number of slots between the incoming terminals 321 of each second coil group 202 is Y-4. Since the number of stator slots 210 between the incoming terminals 321 and the outgoing terminals 322 in the same coil group 20 is Y-1, the number of slots between the outgoing terminals 322 of each first coil group 201 is set to Y-4, and the number of slots between the outgoing terminals 322 of each second coil group 202 is also Y-4. As a result, all the incoming terminals 321 and the outgoing terminals 322 of the three-phase winding structure 10 can be centrally arranged, so that it is convenient to use copper bars for connection, which is conducive to reducing the number of copper bar stacking and further optimizing the overall longitudinal space of the motor.

[0045] Specifically, the number of slots between the incoming terminals 321 of each first coil group 201 is 6, and the number of slots between the incoming terminals 321 of each second coil group 202 is 6. In the three-phase winding structure 10, U1+ is in slot 54, U1- is in slot 45, U2+ is in slot 1, V1+ is in slot 6, and W1+ is in slot 12.

[0046] like Figure 3As shown, the short-pitch winding stator of an embodiment of the present application, wherein the lead structure 32 includes a first conductive connection part 323, a lead conductor edge 324 and a second conductive connection part 325 connected to each other, the lead conductor edge 324 is inserted into the stator slot 210, and the first conductive connection part 323 and the second conductive connection part 325 are both twisted head structures obliquely connected to the lead conductor edge 324, the first conductive connection part 323 is used to connect the coil structure 30, and the second conductive connection part 325 is used to connect an external circuit.

[0047] In a specific implementation, the lead conductor edge 324 is inserted into the stator slot 210 along the axial direction of the stator winding 100 , and serves as a conductor disposed in the adjacent stator slot 210 together with the coil conductor edge 31 , to form a complete coil assembly 20 .

[0048] The first conductive connection part 323 and the second conductive connection part 325 are both in a twisted structure that is obliquely connected to the lead conductor edge 324. The first conductive connection part 323 can be connected to the corresponding coil structure 30, and the second conductive connection part 325 is twisted in the opposite direction, so as to facilitate the connection to the external circuit. In addition, the second conductive connection part 325 also includes an oblique connection part 326 and a copper bar connection part 327. One end of the oblique connection part 326 is obliquely connected to the lead conductor edge 324, and the copper bar connection part 327 is connected to the other end of the oblique connection part 326. The copper bar connection part 327 extends axially, which is convenient for connecting the copper bar assembly 60, reducing the process difficulty during the connection.

[0049] like Figure 1 and Figure 2 As shown, the short-pitch winding stator of the embodiment of the present application, wherein the stator winding 100 also includes a copper bar assembly 60, the copper bar assembly 60 includes a first connecting copper bar 61 and a second connecting copper bar 62, the lead structure 32 is respectively an incoming terminal 321 and an outgoing terminal 322, the two incoming terminals 321 of each phase winding structure 10 are connected through the first connecting copper bar 61, and the first connecting copper bars 61 are arranged at intervals, and all the outgoing terminals 322 of the multi-phase winding structure 10 are connected through the second connecting copper bar 62, and the first connecting copper bars 61 and the second connecting copper bars 62 are arranged at intervals.

[0050] In a specific implementation, the first connecting copper bars 61 of the copper bar assembly 60 are arranged at intervals, which can avoid the situation where a conductive connection occurs between the incoming terminals 321 of each phase winding structure 10, thereby realizing the three-phase incoming line of the stator winding 100; and the first connecting copper bars 61 and the second connecting copper bars 62 are arranged at intervals, which can avoid the situation where a conductive connection occurs between the incoming terminal 321 and the outgoing terminal 322, thereby realizing the connection between all the outgoing terminals 322 of the multi-phase winding structure 10, and completing the star connection of the stator winding 100.

[0051] like Figure 1 and Figure 2 As shown, the short-pitch winding stator of the embodiment of the present application, wherein the first connecting copper bar 61 includes a first connecting plate 611, a first lead-out end 612 and a second lead-out end 613 connected to each other, the first connecting plate 611 extends along the circumferential direction of the stator winding 100, the first lead-out end 612 and the second lead-out end 613 both extend along the axial direction of the stator winding 100, and are respectively used to connect the incoming terminal 321 and the external circuit, the second connecting copper bar 62 includes a second connecting plate 621 and a third lead-out end 622 connected to each other, the second connecting plate 621 extends along the circumferential direction of the stator winding 100, the third lead-out end 622 extends along the axial direction of the stator winding 100, and is used to connect the outgoing terminal 322, the first connecting plate 611 and the second connecting plate 621 are spaced apart in the axial direction, and at least part of the first connecting plate 611 is at the same height in the axial direction.

[0052] In specific implementation, the first connecting plate 611 and the second connecting plate 621 are arranged at intervals in the axial direction, so that the first connecting copper bar 61 and the second connecting copper bar 62 can be at different heights, avoiding positional conflicts between the first connecting copper bar 61 and the second connecting copper bar 62, and contact between the two, resulting in conductive connection between the incoming terminal 321 and the outgoing terminal 322. The first connecting copper bar 61 only needs to connect two incoming terminals 321 of the same phase, so the extension length of the first connecting plate 611 is shorter, so that at least part of the first connecting plate 611 can be at the same height in the axial direction, and the first connecting plate 611 will not be in contact. Such an arrangement can reduce the number of overall layout layers of the first connecting copper bar 61 and the second connecting copper bar 62, and optimize the overall longitudinal space of the motor.

[0053] Specifically, the copper busbar assembly 60 includes three first connecting copper busbars 61, wherein the first connecting plates 611 of two first connecting copper busbars 61 spaced apart in the circumferential direction are at the same height, and the first connecting plate 611 of the middle first connecting copper busbar 61 is at a different height from the other two first connecting plates 611. The double-layer structure of the first connecting copper busbar 61 can form a three-layer stacked structure with the second connecting copper busbar 62. Compared with the copper busbar structure that independently forms a layer structure, the copper busbar assembly 60 in the embodiment of the present application optimizes the overall stacking number, reduces the axial size of the motor, ensures sufficient creepage distance, and avoids safety problems.

[0054] In the first connecting copper bar 61, the first connecting plate 611 is an arc-shaped plate-like structure and is extended in the circumferential direction. The first connecting copper bar 61 includes two first lead-out terminals 612, which are respectively arranged on both sides of the first connecting plate 611 for connecting the same-phase incoming line terminals 321 located at the innermost and outermost layers of the stator slot 210, and the second lead-out terminal 613 is arranged on the outer side of the first connecting plate 611 for external incoming line; in the second connecting copper bar 62, the second connecting plate 621 is an arc-shaped plate-like structure and is extended in the circumferential direction. The second connecting copper bar 62 includes three groups of third lead-out terminals 622, each group of third lead-out terminals 622 includes two third lead-out terminals 622, and each group of two third lead-out terminals 622 is respectively arranged on both sides of the second connecting plate 621 for connecting the same-phase outgoing line terminals 322 located at the innermost and outermost layers.

[0055] like Figure 1 and Figure 2 As shown, the short-pitch winding stator of an embodiment of the present application, wherein the second conductive connection portion 325 of the lead structure 32 in the 1st accommodating layer and the second conductive connection portion 325 of the lead structure 32 in the 2Nth accommodating layer are twisted in opposite directions, and the second conductive connection portions 325 of the two layers are twisted in directions close to each other.

[0056] In each coil group 20, the number of stator slots 210 between the input terminal 321 and the output terminal 322 is Y-1, and there is a certain distance between the two. The second conductive connecting portion 325 of the lead structure 32 in the first accommodating layer and the second conductive connecting portion 325 of the lead structure 32 in the 2Nth accommodating layer are set in opposite directions, and the second conductive connecting portions 325 of the two layers are turned in a direction close to each other, so that all the lead structures 32 of multiple coil groups 20 can be concentrated, which is convenient for the copper bar assembly 60 to be connected, and the difficulty of arranging the copper bar assembly 60 is reduced.

[0057] An embodiment of the present application also provides a motor, which includes the above-mentioned short-pitch winding stator.

[0058] In specific implementation, the motor of the embodiment of the present application includes a short-pitch winding stator, the short-pitch winding stator includes a stator winding 100 and a stator core 200, the stator winding 100 includes a multi-phase winding structure 10, each phase winding structure 10 includes two parallel coil groups 20 to form two parallel branches of each phase, each coil group 20 includes a plurality of coil structures 30 with different spans and two lead structures 32, and the two coil conductor edges 31 of the coil structure 30 are respectively inserted into adjacent accommodation layers in two stator slots 210 of the stator core 200, so that each coil group 20 can be wound sequentially from the 1st layer of the accommodation layer to the 2Nth layer, thereby forming a complete current path to realize motor winding. The two lead structures 32 are respectively arranged at the two ends of the corresponding coil group 20 and plugged into the 1st and 2Nth layers of the containing layer, and are connected to the head and tail ends of the multiple coil structures 30 connected in sequence to input and output current. Since the structures of the multiple lead structures 32 are exactly the same and are all plugged into the 1st and 2Nth layers of the containing layer, when the multiple lead structures 32 extend from the crown end 50 of the stator winding 100, they can form a neat arrangement. Therefore, when connecting the copper busbar, there is no need to perform a complicated multi-layer copper busbar setting, thereby reducing the overall axial size of the motor, ensuring sufficient creepage distance, and avoiding safety problems.

[0059] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0060] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A short-pitch winding stator, characterized in that: It comprises a stator winding (100) and a stator core (200), wherein the stator core (200) comprises a plurality of stator slots (210), and each of the stator slots (210) comprises 2N accommodating layers; The stator winding (100) comprises a multi-phase winding structure (10), each phase of the winding structure (10) comprises two parallel coil groups (20), each coil group (20) comprises a plurality of coil structures (30) with different spans and two lead structures (32), the coil structure (30) comprises two connected coil conductor sides (31), the two coil conductor sides (31) are respectively inserted into adjacent accommodating layers of different stator slots (210), and the plurality of coil structures (30) of each coil group (20) are sequentially wound from the first layer to the 2Nth layer of the accommodating layer; the two lead structures (32) are respectively arranged at the two ends of the corresponding coil group (20) and inserted into the accommodating layers of the first layer and the 2Nth layer, and the lead structures (32) extend out from the crown end (50) of the stator winding (100).

2. The short-pitch winding stator according to claim 1, characterized in that: Each coil group (20) includes three coil structures (30) with spans of Y-1, Y and Y+2; within the 2i-th and 2i-1-th accommodating layers, the three coil structures (30) with spans of Y-1, Y and Y+2 are interconnected to form a coil layer (21); between the 2i-th and 2i+1-th accommodating layers, adjacent coil layers (21) are connected via the coil structure (30) with a span of Y-1.

3. The short-pitch winding stator according to claim 1, characterized in that: The lead structures (32) at both ends of each coil group (20) are respectively an incoming terminal (321) and an outgoing terminal (322), and the number of stator slots (210) spaced between the incoming terminal (321) and the outgoing terminal (322) of each coil group (20) is Y-1.

4. The short-pitch winding stator according to claim 3, characterized in that: The two coil groups (20) connected in parallel are respectively a first coil group (201) and a second coil group (202); the incoming terminal (321) of the first coil group (201) and the incoming terminal (321) of the second coil group (202) are respectively arranged in the first layer and the 2Nth layer of the accommodation layer; the outgoing terminal (322) of the second coil group (202) and the outgoing terminal (322) of the first coil group (201) are respectively arranged in the first layer and the 2Nth layer of the accommodation layer; the number of interval slots between the incoming terminals (321) of each of the first coil groups (201) is Y-4, and the number of interval slots between the incoming terminals (321) of each of the second coil groups (202) is Y-4.

5. The short-pitch winding stator according to claim 1, characterized in that: The lead structure (32) comprises a first conductive connection part (323), a lead conductor edge (324) and a second conductive connection part (325) which are connected to each other; the lead conductor edge (324) is inserted into the stator slot (210); the first conductive connection part (323) and the second conductive connection part (325) are both twisted structures obliquely connected to the lead conductor edge (324); the first conductive connection part (323) is used to connect the coil structure (30); and the second conductive connection part (325) is used to connect an external circuit.

6. The short-pitch winding stator according to claim 5, characterized in that: The stator winding (100) further comprises a copper bar assembly (60), wherein the copper bar assembly (60) comprises a first connecting copper bar (61) and a second connecting copper bar (62), wherein the lead structure (32) comprises an incoming terminal (321) and an outgoing terminal (322), respectively; the two incoming terminals (321) of each phase of the winding structure (10) are connected via the first connecting copper bar (61), and the first connecting copper bars (61) are arranged at intervals; all the outgoing terminals (322) of the multi-phase winding structure (10) are connected via the second connecting copper bar (62), and the first connecting copper bars (61) and the second connecting copper bars (62) are arranged at intervals.

7. The short-pitch winding stator according to claim 6, characterized in that: The first connecting copper bar (61) comprises a first connecting plate (611), a first lead-out end (612) and a second lead-out end (613) which are connected to each other; the first connecting plate (611) extends along the circumferential direction of the stator winding (100); the first lead-out end (612) and the second lead-out end (613) both extend along the axial direction of the stator winding (100) and are respectively used to connect the incoming terminal (321) and an external circuit; the second connecting copper bar (62) comprises a second connecting plate (621) and a third lead-out end (622) which are connected to each other; the second connecting plate (621) extends along the circumferential direction of the stator winding (100); the third lead-out end (622) extends along the axial direction of the stator winding (100) and is used to connect the outgoing terminal (322); the first connecting plate (611) and the second connecting plate (621) are spaced apart from each other along the axial direction; at least part of the first connecting plate (611) is at the same height in the axial direction.

8. The short-pitch winding stator according to claim 5, characterized in that: The second conductive connection part (325) of the lead structure (32) in the first layer of the accommodation layer and the second conductive connection part (325) of the lead structure (32) in the second layer of the accommodation layer are twisted in opposite directions, and the second conductive connection parts (325) of the two layers are twisted in directions close to each other.

9. The short-pitch winding stator according to claim 2, characterized in that: The stator core (200) comprises 54 stator slots (210) distributed along the circumferential direction, the stator winding (100) comprises a three-phase winding structure (10), and the number of pole pairs of the short-distance winding stator is 3; In the 2i-th and 2i-1-th accommodating layers, three types of coil structures (30) with spans of 9, 10 and 12 are interconnected to form the coil layer (21); in one coil layer (21), the spans of a plurality of coil structures (30) form a span combination of 9, 10, 10, 10, 10, 10, 10 and 12; between the 2i-th and 2i+1-th accommodating layers, adjacent coil layers (21) are connected via the coil structure (30) with a span of 9.

10. A motor, characterized in that: The invention comprises a short-pitch winding stator as claimed in any one of claims 1 to 9.

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