Stator assembly, motor, power assembly and vehicle

Abstract

The utility model discloses a stator assembly, a motor, a power assembly and a vehicle. The stator assembly comprises a stator core and a stator winding. The stator winding comprises a multi-phase winding which is wound on M stator slots of the stator core, each phase winding comprises at least one branch, each branch comprises a plurality of hairpins which are connected in series, each hairpin comprises two insertion parts which are inserted into different stator slots, and each slot layer of each stator slot accommodates one insertion part; the hairpin in each branch of each phase of winding comprises two welding parts, the two welding parts are connected with the insertion parts of the corresponding hairpins, the span between the two welding parts is y-z, y is the polar distance of the motor, and z is the slot number of the short distance of each phase of winding. Therefore, harmonic waves in a magnetic field are effectively eliminated, the stator winding is optimized, concentrated wire outgoing of each phase of winding of the stator winding can be facilitated, and the difficulty of concentrated wire outgoing is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a stator component, a motor, a power assembly and a vehicle. Background Art

[0002] In the prior art, the stator winding includes a plurality of hairpin coils, which are inserted into the stator slots of the stator core in a certain arrangement to form the winding of the required single-phase motor or multi-phase motor. However, in most existing motors, the hairpin coils used in the stator winding are of many types, with complex manufacturing processes, high production costs and low processing efficiency. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the first purpose of the utility model is to provide a stator assembly that can realize concentrated winding output and reduce copper loss.

[0004] The second objective of the present invention is to provide a motor, comprising the stator assembly described above.

[0005] The third objective of the present invention is to provide a power assembly, comprising the motor described above.

[0006] A fourth objective of the present invention is to provide a vehicle comprising the powertrain described above.

[0007] According to a stator assembly of an embodiment of the first aspect of the present utility model, the stator assembly includes: a stator core and a stator winding, wherein the inner wall of the stator core is provided with M stator slots spaced apart in the circumferential direction, each of the stator slots includes N slot layers spaced apart in the radial direction of the stator core, M is a multiple of 3 and an even number, and N is an even number; the stator winding includes a multi-phase winding wound on the M stator slots of the stator core, each phase winding includes at least one branch, each branch includes a plurality of hairpins connected in series, each hairpin includes two plug-in portions inserted in different stator slots, and each slot layer of each stator slot accommodates one plug-in portion; wherein the hairpin in each branch of each phase winding includes two welding portions, the two welding portions are connected to the corresponding plug-in portions of the hairpin, and the span between the two welding portions is yz, y is the pole pitch of the motor, and z is the number of slots of each phase winding short pitch.

[0008] According to the stator assembly of the embodiment of the utility model, the stator winding is wound in the form of two short-distance stator slots, so as to effectively eliminate the 5th and 7th harmonics in the magnetic field, and have a good inhibitory effect on the 24th order torque pulsation of the motor, which is convenient for optimizing the winding structure of the stator assembly, and optimizing the stator winding is convenient for each phase winding of the stator winding to be able to concentrate the output, reducing the difficulty of concentrated output. In addition, the connection of the overall winding adopts a lap winding method to reduce the height between the two ends of the stator assembly along the axial direction, which can reduce the length of the copper wire wound on the hairpin, reduce the amount of copper used and reduce costs, thereby reducing resistance, reducing copper loss and improving efficiency.

[0009] In some embodiments, in a plurality of adjacent stator slots having a common phase winding, N slot layers in the middle stator slot are in-phase windings, at least two-phase windings are provided in the stator slot adjacent to the middle stator slot, the two-phase windings in the adjacent stator slots are evenly distributed in the N slot layers of each stator slot, and the slot layers in the stator slots of the two-phase windings corresponding to the in-phase windings of the middle stator slots are staggered along the circumference of the stator core.

[0010] In some embodiments, the hairpin is a flat wire hairpin, which includes multiple first hairpins, multiple second hairpins and multiple third hairpins. The third hairpin in each branch along the radial direction of the stator core is located at the outermost side, the first hairpin is located at the innermost side, and the second hairpin is located between the first hairpin and the third hairpin. Along the series connection direction of the multiple flat wire hairpins, the second hairpin is connected between the third hairpin and the first hairpin in each branch of each phase winding. The span of the first hairpin and the third hairpin is y, the span of the second hairpin is y-1, and the span of some of the second hairpins is y-4.

[0011] In some embodiments, the number z of short-spacing slots is 2, the spans of the first hairpin and the third hairpin are 7, the spans of the second hairpin include 5 and 8; the span between the two welding parts of any flat wire hairpin is 7.

[0012] In some embodiments, the slot layers where the two plug-in parts of the first hairpin and the third hairpin are located are the same slot layer; the slot layers where the two plug-in parts of the second hairpin are located are two adjacent stator slots.

[0013] In some embodiments, the multi-phase winding includes a first phase winding, a second phase winding and a third phase winding; the adjacent plurality of stator slots include a first slot, a second slot, a third slot, a fourth slot and a fifth slot arranged in sequence along the circumferential direction, and the plurality of plug-in portions in the third slot that respectively cooperate with the plurality of slot layers belong to the second phase winding; the plurality of plug-in portions in the plurality of slot layers of the first slot and the second slot respectively belong to the first phase winding and the second phase winding; the plurality of plug-in portions in the plurality of slot layers of the fourth slot and the fifth slot respectively belong to the second phase winding and the third phase winding.

[0014] In some embodiments, the plug-in portions belonging to the second phase winding in the first slot and the second slot are located in the same slot layer; the plug-in portions of the second phase winding in the fourth slot and the fifth slot are located in the same slot layer.

[0015] In some embodiments, the plug-in portions belonging to the second phase winding in the first slot and the second slot are radially staggered with the plug-in portions belonging to the second phase winding in the third slot and the fourth slot.

[0016] In some embodiments, the number M of the stator slots is 72, the 72 stator slots are numbered 1-72 in sequence, the slot layers N of each stator slot are 6, the 6 slot layers are numbered af in sequence from the inside to the outside along the radial direction of the stator core, the hairpin is a flat wire hairpin; each phase winding includes three parallel branches, the three parallel branches include a first branch, a second branch and a third branch, and the threading positions of the multiple plug-in parts corresponding to the multiple flat wire hairpins in the first branch in the 72 stator slots are as follows:

[0017] 1f→64f→57e→65d→58c→66b→59a→50a→57b→49c→56d→48e→

[0018] 55f→46f→39e→47d→40c→48b→41a→32a→39b→31c→38d→30e→

[0019] 37f→28f→21e→29d→22c→30b→23a→14a→21b→13c→20d→12e→

[0020] 19f→10f→3e→11d→4c→12b→5a→68d→3b→67c→2d→66e;

[0021] In the second branch, the threading positions of the plurality of the plug-in parts corresponding to the plurality of the flat wire hairpins in the 72 stator slots are as follows:

[0022] 2f→65f→58e→66d→59c→64b→57a→48a→55b→50c→57d→49e→

[0023] 56f→47f→40e→48d→41c→46b→39a→30a→37b→32c→39d→31e→

[0024] 38f→29f→22e→30d→23c→28b→21a→12a→19b→14c→21d→13e→

[0025] 20f→11f→4e→12d→5c→10b→3a→66a→1b→68c→3d→67e;

[0026] In the third branch, the threading positions of the plurality of the plug-in parts corresponding to the plurality of the flat wire hairpins in the 72 stator slots are as follows:

[0027] 3f→66f→59e→64d→57c→65b→58a→49a→56b→48c→55d→50e→

[0028] 57f→48f→41e→46d→39c→47b→40a→31a→38b→30c→37d→32e→

[0029] 39f→30f→23e→28d→21c→29b→22a→13a→20b→12c→19d→14e→

[0030] 21f→12f→5e→10d→3c→11b→4a→67a→2b→66c→1d→68e.

[0031] In some embodiments, the star point lines of the three branches of the same phase are respectively located in three spatially adjacent stator slots.

[0032] In some embodiments, the lead wire corresponding to each phase winding is spatially spaced apart from the star point line by 2q stator slots, where q is the number of slots per pole and per phase.

[0033] In some embodiments, the flat wire hairpin further includes: two connecting parts, the connecting parts are arranged at the same end of the two plug-in parts corresponding to each of the flat wire hairpins, the two connecting parts are connected to each other, and the two welding parts are arranged at one end of the two plug-in parts corresponding to each of the flat wire hairpins away from the connecting parts.

[0034] In some embodiments, the welding portion includes: a first welding segment and a second welding segment, one end of the first welding segment is connected to the plug-in portion, and the other end of the first welding segment is connected to the second welding segment; wherein the second hairpin includes two first welding segments extending obliquely in a direction approaching each other, and the two second welding segments are parallel.

[0035] In some embodiments, the two welding portions of the first hairpin are bent in the same and parallel directions; the two welding portions of the third hairpin are bent in the same and parallel directions.

[0036] The motor according to the second aspect of the present invention comprises the stator assembly described in any one of the above embodiments.

[0037] The power assembly according to the embodiment of the third aspect of the utility model includes the motor described in the above embodiment.

[0038] The vehicle according to the fourth aspect of the present invention comprises the motor described in the above embodiment or the powertrain described in the embodiment.

[0039] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0041] Figure 1 is a schematic diagram of a stator winding of an embodiment of the utility model;

[0042] Figure 2 yes Figure 1 Enlarged schematic diagram of the middle P region;

[0043] Figure 3 is a schematic diagram of a first phase winding of an embodiment of the utility model;

[0044] Figure 4 is a schematic diagram of the second phase winding of an embodiment of the utility model;

[0045] Figure 5 is a schematic diagram of the third phase winding of an embodiment of the utility model;

[0046] Figure 6 This is a schematic diagram of a flat wire hairpin in an embodiment of the utility model arranged in a stator core;

[0047] Figure 7 It is a schematic diagram of the first card issuing embodiment of the utility model;

[0048] Figure 8 It is a schematic diagram of the second card issuing method of an embodiment of the utility model;

[0049] Fig. 9 It is a schematic diagram of a second card issuing device according to another embodiment of the utility model;

[0050] Fig.10 It is a schematic diagram of the third card issuing embodiment of the utility model.

[0051] Reference numerals:

[0052] 1. Stator assembly;

[0053] 10. stator core; 11. stator slot; 111. first slot; 112. second slot; 113. third slot; 114. fourth slot; 115. fifth slot;

[0054] 20. Stator winding; 21. Flat wire hairpin; 211. First hairpin; 212. Second hairpin; 213. Third hairpin; 214. Connecting part; 215. Inserting part; 216. Welding part; 2161. First welding section; 2162. Second welding section; 22. First phase winding; 23. Second phase winding; 24. Third phase winding. DETAILED DESCRIPTION

[0055] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 10 A stator assembly 1 according to an embodiment of the present invention is described. The stator assembly 1 includes: a stator core 10 and a stator winding 20 .

[0056] Specifically, if Figure 1-Figure 5 As shown, the inner wall of the stator core 10 is provided with M stator slots 11 spaced apart along the circumferential direction, each stator slot 11 includes N slot layers spaced apart along the radial direction of the stator core 10, M is a multiple of 3 and is an even number, and N is an even number; the stator winding 20 includes a multi-phase winding wound around the M stator slots 11 of the stator core 10, and each phase winding has a different electrical phase from each other.

[0057] Each phase winding includes at least one branch, each branch includes a plurality of hairpins connected in series, each hairpin includes two plug-in portions 215 inserted in different stator slots 11, each slot layer of each stator slot 11 accommodates one plug-in portion 215, and each stator slot 11 can accommodate N plug-in portions 215. In this embodiment, the hairpin is a flat wire hairpin 21, but is not limited thereto.

[0058] The flat wire hairpin 21 in each branch of each phase winding includes two welding parts 216, and the two welding parts 216 are connected to the corresponding plug-in parts 215 of the flat wire hairpin 21, that is, each flat wire hairpin 21 includes two plug-in parts 215 and two welding parts 216, and the two welding parts 216 are connected to the two plug-in parts 215 and are located at the same end of the two plug-in parts 215, and the two plug-in parts 215 are suitable for matching with the slot layers of different stator slots 11, and the welding parts 216 are located outside the slot layers, and are used to be electrically connected to other adjacent flat wire hairpins 21 belonging to the same phase. The span between the two welding parts 216 is yz, y is the pole pitch of the motor, and z is the number of slots of each phase winding short distance.

[0059] According to the stator assembly 1 of the embodiment of the utility model, by limiting the span of the welding portion 216, it is convenient to optimize the winding structure of the stator assembly 1, and optimize the stator winding 20 so that each phase winding of the stator winding 20 can be concentrated to reduce the difficulty of concentrated output. In addition, the connection of the overall winding adopts a lap winding method to reduce the height between the two ends of the stator assembly 1 along the axial direction, which can reduce the length of the copper wire wound on the flat wire hairpin 21, reduce the amount of copper used and reduce costs, thereby reducing resistance, reducing copper loss and improving efficiency.

[0060] In some embodiments, in combination Figure 2 In a plurality of adjacent stator slots 11 having a common phase winding, N slot layers in a middle stator slot 11 are in-phase windings, at least two-phase windings are provided in the stator slots 11 adjacent to the middle stator slot 11, the two-phase windings in the adjacent stator slots 11 are evenly distributed in the N slot layers of each stator slot 11, and the slot layers in the stator slots 11 of the two-phase windings corresponding to the in-phase windings of the middle stator slots 11 are staggered along the circumferential direction of the stator core 10.

[0061] That is, the plug-in portions 215 arranged in the multiple slot layers in the middle stator slot 11 belong to the same phase winding, and the two stator slots 11 are respectively arranged adjacent to the middle stator slot 11 on both sides of the middle stator slot 11 along the circumferential direction of the stator core 10, and the plug-in portions 215 arranged in the multiple slot layers in the two stator slots 11 belong to different phase windings, and for the four stator slots 11 adjacent to the middle stator slot 11 and symmetrically distributed about the middle stator slot 11, the slot layers in the stator slot 11 respectively cooperate with the plug-in portions 215 belonging to two different phase windings.

[0062] Optionally, for the four stator slots 11 located on both sides of the middle stator slot 11 along the circumferential direction of the stator assembly 1, the plug-in parts 215 belonging to different phase windings arranged in the stator slots 11 are evenly distributed in the corresponding slot layers. For example, in the above four stator slots 11, the multiple slot layers arranged in each stator slot 11 respectively cooperate with the plug-in parts 215 belonging to two different phase windings, that is, the plug-in parts 215 matched in half of the multiple slot layers in each stator slot 11 belong to one phase winding, and the plug-in parts 215 matched in the other half of the multiple slot layers in each stator slot 11 are arranged in another phase winding. That is, the number of slots of each phase winding short moment z=2. In this embodiment, an 8-pole 72-slot motor with centralized output is taken as an example, and its pole pitch y=9, z=2, then the span between the two welding parts 216 of the hairpin is 7 stator slots 11.

[0063] Therefore, the stator winding 20 is wound in the form of two short-distance stator slots 11, so as to effectively eliminate the 5th and 7th harmonics in the magnetic field, and have a good inhibitory effect on the 24th-order torque pulsation of the motor, which is convenient for optimizing the winding structure of the stator assembly 1. Optimizing the stator winding 20 makes it possible for each phase winding of the stator winding 20 to be concentrated in the output, reducing the difficulty of concentrated output.

[0064] In some embodiments, Figure 6-Figure 10 As shown, the hairpin is a flat wire hairpin 21, which includes a plurality of first hairpins 211, a plurality of second hairpins 212 and a plurality of third hairpins 213. The third hairpins 213 in each branch along the radial direction of the stator core 10 are located at the outermost side, the first hairpins 211 are located at the innermost side, and the second hairpins 212 are located between the first hairpins 211 and the third hairpins 213. Along the series connection direction of the plurality of flat wire hairpins 21, a second hairpin 212 is connected between the third hairpin 213 and the first hairpin 211 in each branch of each phase winding. The spans of the first hairpin 211 and the third hairpin 213 are both y, the spans of some second hairpins 212 are y-1, and the spans of some second hairpins 212 are y-4.

[0065] In this embodiment, each phase winding includes a plurality of flat wire hairpins 21, and the plurality of flat wire hairpins 21 include a first hairpin 211, a second hairpin 212, and a third hairpin 213 distributed from the inside to the outside in the radial direction of the stator assembly 1, wherein when the first hairpins 211 and the third hairpins 213 are arranged, the plurality of first hairpins 211 are located at the radial innermost side of the stator assembly 1, and the two plug-in portions 215 of each first hairpin 211 are located in the same slot layer of different stator slots 11, and the plurality of third hairpins 213 are located at the radial outermost side of the stator assembly 1, and the two plug-in portions 215 of each third hairpin 213 are located in the same slot layer of different stator slots 11.

[0066] The spans of the first hairpin 211 and the third hairpin 213 are 9, and the spans of the second hairpin 212 are 8 and 5, that is, among the plurality of second hairpins 212, some of the second hairpins 212 have a span of 8, and some of the second hairpins 212 have a span of 5. Thus, by using the first hairpin 211, the third hairpin 213, and the second hairpin 212 with the above spans, it is convenient to arrange the hairpins with different spans on the stator assembly 1, and it is convenient to centrally output the stator winding 20 on the stator assembly 1, so that the motor has a higher output power.

[0067] The span between the two welding portions 216 of any flat wire hairpin 21 is 7. Thus, limiting the span between the two welding portions 216 of the flat wire hairpin 21 facilitates the arrangement of multiple flat wire hairpins 21 on the stator assembly 1 and the connection between adjacent flat wire hairpins 21 .

[0068] In some embodiments, the slot layers where the two plug-in parts 215 of the first hairpin 211 and the third hairpin 213 are located are the same slot layers respectively; the slot layers where the two plug-in parts 215 of the second hairpin 212 are located are two adjacent stator slots 11. That is, when multiple first hairpins 211 and third hairpins 213 are arranged, multiple first hairpins 211 and multiple third hairpins 213 are arranged along the circumferential direction of the stator assembly 1, and the two plug-in parts 215 of the first hairpin 211 and the third hairpin 213 are respectively located in the same slot layer of different stator slots 11, and the second hairpin 212 is arranged between the first hairpin 211 and the third hairpin 213. For the first hairpin 211 of the same phase winding. The second hairpin 212 and the third hairpin 213, the second hairpin 212 connects the first hairpin 211 and the third hairpin 213, and the two plug-in parts 215 of the second hairpin 212 are respectively located in adjacent slot layers of different stator slots 11. Thus, the connection between a plurality of flat wire hairpins 21 with different spans in the same phase winding can be ensured.

[0069] In some embodiments, Figure 1-Figure 5 As shown, the multi-phase winding includes a first phase winding 22, a second phase winding 23 and a third phase winding 24; for example, in the embodiment of the present application, the first phase winding 22 is a U phase winding, the second phase winding 23 is a V phase winding, and the third phase winding is a W phase winding. The adjacent plurality of stator slots 11 include a first slot 111, a second slot 112, a third slot 113, a fourth slot 114 and a fifth slot 115 arranged in sequence along the circumferential direction, and the plurality of plug-in portions 215 in the third slot 113 that are respectively matched with the plurality of slot layers belong to the second phase winding 23; the plurality of plug-in portions 215 in the plurality of slot layers of the first slot 111 and the second slot 112 belong to the first phase winding 22 and the second phase winding 23 respectively; the plurality of plug-in portions 215 in the plurality of slot layers of the fourth slot 114 and the fifth slot 115 belong to the second phase winding 23 and the third phase winding 24 respectively.

[0070] For example, each stator slot 11 has slot layers, and the three plug-in portions 215 belonging to the first phase winding 22 in the first slot 111 are respectively located in the second slot 112 layer, the fourth slot 114 layer and the sixth slot layer, and the corresponding three plug-in portions 215 belonging to the first phase winding 22 in the second slot 112 are respectively located in the second slot 112 layer, the fourth slot 114 layer and the sixth slot layer. The three plug-in portions 215 belonging to the second phase winding 23 in the first slot 111 are respectively located in the first slot 111 layer, the third slot 113 layer and the fifth slot 115 layer, and the corresponding three plug-in portions 215 belonging to the second phase winding 23 in the second slot 112 are respectively located in the first slot 111 layer, the third slot 113 layer and the fifth slot 115 layer. The three plug-in parts 215 belonging to the second phase winding 23 in the fourth slot 114 are respectively located in the first slot 111 layer, the third slot 113 layer and the fifth slot 115 layer, and the corresponding three plug-in parts 215 belonging to the second phase winding 23 in the fifth slot 115 are respectively located in the first slot 111 layer, the third slot 113 layer and the fifth slot 115 layer. The three plug-in parts 215 belonging to the third phase winding 24 in the fourth slot 114 layer are respectively located in the second slot 112 layer, the fourth slot 114 layer and the sixth slot layer, and the corresponding three plug-in parts 215 belonging to the third phase winding 24 in the sixth slot are respectively located in the second slot 112 layer, the fourth slot 114 layer and the sixth slot layer.

[0071] Further, refer to Figure 2 , the plug-in parts 215 belonging to the second phase winding 23 in the first slot 111 and the second slot 112 are located in the same slot layer; the plug-in parts 215 of the second phase winding 23 in the fourth slot 114 and the fifth slot 115 are located in the same slot layer. For the adjacent first slot 111 and second slot 112, the plug-in parts 215 belonging to the second phase winding 23 are located in the same slot layer of the two stator slots 11, and similarly, the plug-in parts 215 belonging to the second phase winding 23 in the fourth slot 114 and the fifth slot 115 are located in the same slot layer of the two stator slots 11.

[0072] Furthermore, the plug-in portions 215 belonging to the second phase winding 23 in the first slot 111 and the second slot 112 are radially staggered with the plug-in portions 215 belonging to the second phase winding 23 in the third slot 113 and the fourth slot 114. If the plug-in portions 215 belonging to the same phase winding of the first slot 111 and the second slot 112 and the third slot 113 are located in the even-numbered slot layers of the first slot 111 and the second slot 112, the plug-in portions 215 belonging to the same phase winding of the adjacent fourth slot 114 and the fifth slot 115 and the third slot 113 are located in the odd-numbered slot layers of the fourth slot 114 and the fifth slot 115. On the contrary, when the connecting parts 215 of the first slot 111 and the second slot 112 belonging to the same phase winding as the third slot 113 are located in odd layers, the connecting parts 215 of the adjacent fourth slot 114 and the fifth slot 115 belonging to the same phase winding as the third slot 113 are located in the slot layers of the even layers of the fourth slot 114 and the fifth slot 115.

[0073] Therefore, the first slot 111 and the second slot 112 and the third slot 113 belong to the plug-in portion 215 of the same-phase winding, and the fourth slot 114 and the fifth slot 115 and the third slot 113 belong to the plug-in portion 215 of the same-phase winding, which are arranged in a staggered manner, which can facilitate the winding of the stator winding 20 with two stator slots 11 of the short moment, facilitate the setting of the flat wire hairpin 21, reduce the types and number of flat wire hairpins 21, and reduce the difficulty of the manufacturing process. And in the embodiment of the present application, each phase winding is arranged in the stator slot 11 of the stator core 10 in the form of two stator slots 11 of the short moment. Thereby, the 5th and 7th harmonics in the magnetic field can be effectively eliminated, and the 24th order torque pulsation of the motor can be better suppressed.

[0074] In some embodiments, the number M of stator slots 11 is 72, the 72 stator slots 11 are numbered 1-72 in sequence, the slot layers N of each stator slot 11 are 6, the 6 slot layers are numbered af from inside to outside along the radial direction of the stator core 10, and the hairpin is a flat wire hairpin 21.

[0075] Each phase winding includes three parallel branches, and the three parallel branches include a first branch, a second branch and a third branch.

[0076] As shown in Figure 3, in the first branch, the threading positions of the plurality of plug-in portions 215 corresponding to the plurality of flat wire hairpins 21 in the 72 stator slots 11 are as follows:

[0077] 1f→64f→57e→65d→58c→66b→59a→50a→57b→49c→56d→48e→

[0078] 55f→46f→39e→47d→40c→48b→41a→32a→39b→31c→38d→30e→

[0079] 37f→28f→21e→29d→22c→30b→23a→14a→21b→13c→20d→12e→

[0080] 19f→10f→3e→11d→4c→12b→5a→68d→3b→67c→2d→66e.

[0081] like Figure 4 As shown, in the second branch, the threading positions of the plurality of plug-in portions 215 corresponding to the plurality of flat wire hairpins 21 in the 72 stator slots 11 are as follows:

[0082] 2f→65f→58e→66d→59c→64b→57a→48a→55b→50c→57d→49e→

[0083] 56f→47f→40e→48d→41c→46b→39a→30a→37b→32c→39d→31e→

[0084] 38f→29f→22e→30d→23c→28b→21a→12a→19b→14c→21d→13e→

[0085] 20f→11f→4e→12d→5c→10b→3a→66a→1b→68c→3d→67e.

[0086] like Figure 5 As shown, in the third branch, the threading positions of the multiple plug-in parts 215 corresponding to the multiple flat wire hairpins 21 in the 72 stator slots 11 are as follows:

[0087] 3f→66f→59e→64d→57c→65b→58a→49a→56b→48c→55d→50e→

[0088] 57f→48f→41e→46d→39c→47b→40a→31a→38b→30c→37d→32e→

[0089] 39f→30f→23e→28d→21c→29b→22a→13a→20b→12c→19d→14e→

[0090] 21f→12f→5e→10d→3c→11b→4a→67a→2b→66c→1d→68e.

[0091] In some embodiments, the star point lines of the three branches of the same phase are respectively located in three spatially adjacent stator slots 11. Connecting the three branches of the same phase by the star point line can effectively prevent the circulation of the third harmonic and improve the output efficiency of the motor.

[0092] In some embodiments, the lead wire corresponding to each phase winding is spaced apart from the star line by 2q stator slots 11, where q is the number of slots per pole per phase. Here, q=72 / 8 / 3=3, that is, the interval between the star line and the lead wire corresponding to each phase winding is 6 stator slots 11.

[0093] Combination Figure 3-Figure 5In the embodiment of the present application, A, B, and C respectively represent the lead wires of the first phase winding 22, the second phase winding 23, and the third phase winding 24, and X, Y, and Z respectively represent the star point lines of the first phase winding 22, the second phase winding 23, and the third phase winding 24, so as to facilitate the welding of different lead wires and star point lines. Among them, A1, A2, and A3 respectively correspond to the lead wires of the three branches of the first phase winding 22, and X1, X2, and X3 respectively correspond to the star point lines of the three branches of the first phase winding 22. The same is true for the others and will not be repeated.

[0094] In some embodiments, Figure 7-Figure 10 As shown, the flat wire hairpin 21 further includes: two connecting parts 214, the connecting parts 214 are arranged at the same end of the two plug-in parts 215 corresponding to each flat wire hairpin 21, the two connecting parts 214 are connected to each other, and two welding parts 216 are arranged at one end of the two plug-in parts 215 corresponding to each flat wire hairpin 21 away from the connecting parts 214. That is, the flat wire hairpin 21 includes two connecting parts 214, two welding parts 216 and two plug-in parts 215, wherein the two plug-in parts 215 are respectively connected to the two connecting parts 214 and the two welding parts 216, and the ends of the two connecting parts 214 away from the plug-in parts 215 are respectively connected after connection, and the ends of the two welding parts 216 away from the plug-in parts 215 are spaced apart.

[0095] The welding part 216 includes: a first welding section 2161 and a second welding section 2162, one end of the first welding section 2161 is connected to the plug-in part 215, and the other end of the first welding section 2161 is connected to the second welding section 2162; wherein the two first welding sections 2161 included in the second hairpin 212 extend obliquely toward each other, and the two second welding sections 2162 are parallel. That is, to facilitate the arrangement of the flat wire hairpin 21 on the stator assembly 1 and the connection between adjacent flat wire hairpins 21, the welding part 216 includes a first welding section 2161 connected to the plug-in part 215, and a second welding section 2162 connected to the first welding section 2161 at an end of the first welding section 2161 away from the plug-in part 215, the two first welding sections 2161 extend obliquely toward each other from one end connected to the plug-in part 215 to one end connected to the second welding section 2162, and are arranged at intervals, and the second welding sections 2162 are arranged in parallel. Therefore, the second hairpin 212 can be matched with the slot layer of the corresponding stator slot 11 when set, and the arrangement of multiple flat wire hairpins 21 in the stator winding 20 and the winding on the flat wire hairpins 21 are facilitated.

[0096] In some embodiments, the two welding portions 216 of the first hairpin 211 are bent in the same and parallel directions; the two welding portions 216 of the third hairpin 213 are bent in the same and parallel directions. For example, the welding portions 216 of the first hairpin 211 and the third hairpin 213 include a third welding section and a fourth welding section, one end of the third welding section is connected to the corresponding welding section 216, the other ends of the two third welding sections are arranged in parallel, the fourth welding section is connected to one end of the principle plug-in section 215 of the third welding section, the fourth welding section is arranged in parallel to the corresponding plug-in section 215, and the third welding section extends obliquely from one end to the other end toward the fourth welding section. In this way, it is convenient to reduce the number of the first hairpin 211 and the second hairpin 212, and reduce costs.

[0097] The motor according to the second aspect of the present invention comprises the stator assembly 1 of any one of the above embodiments.

[0098] According to the motor of the embodiment of the utility model, the types of flat wire hairpins 21 used in the motor can be reduced, the required equipment is less, and it is easier to achieve mass production, reducing costs. Moreover, since the stator winding 20 of the motor adopts a short-torque method, the 5th and 7th harmonics in the magnetic field can be more effectively eliminated, and the 24th-order torque pulsation of the motor can be better suppressed. At the same time, the height of the flat wire hairpin 21 coil can be reduced, the amount of copper used can be reduced, and the motor efficiency can be improved.

[0099] The powertrain according to the embodiment of the third aspect of the utility model includes the motor in the above embodiment.

[0100] The vehicle according to the fourth aspect of the present utility model comprises the motor in the above embodiment or the powertrain in the above embodiment.

[0101] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0102] In the description of the present utility model, "first feature" and "second feature" may include one or more of the features. In the description of the present utility model, "plurality" means two or more. In the description of the present utility model, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. In the description of the present utility model, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

[0103] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0104] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stator assembly, characterized in that: include: A stator core, wherein the inner wall of the stator core is provided with M stator slots spaced apart along the circumferential direction, each of the stator slots comprises N slot layers spaced apart along the radial direction of the stator core, M is a multiple of 3 and is an even number, and N is an even number; A stator winding, the stator winding comprising a multi-phase winding wound on M stator slots of the stator core, each phase winding comprising at least one branch, each branch comprising a plurality of hairpins connected in series, each hairpin comprising two plug-in portions inserted in different stator slots, and each slot layer of each stator slot accommodating one plug-in portion; Among them, the hairpin in each branch of each phase winding includes two welding parts, the two welding parts are connected to the corresponding plug-in parts of the hairpin, and the span between the two welding parts is yz, y is the pole pitch of the motor, and z is the number of short-distance slots of each phase winding.

2. The stator assembly according to claim 1, characterized in that In a plurality of adjacent stator slots having a common phase winding, N slot layers in the middle stator slot are in-phase windings, at least two-phase windings are provided in the stator slot adjacent to the middle stator slot, the two-phase windings in the adjacent stator slots are evenly distributed in the N slot layers of each stator slot, and the slot layers in the stator slots of the two-phase windings corresponding to the in-phase windings of the middle stator slots are staggered along the circumferential direction of the stator core.

3. The stator assembly according to claim 1, characterized in that: The hairpin is a flat wire hairpin, and the flat wire hairpin includes a plurality of first hairpins, a plurality of second hairpins, and a plurality of third hairpins. The third hairpins in each branch along the radial direction of the stator core are located at the outermost side, the first hairpins are located at the innermost side, and the second hairpins are located between the first hairpins and the third hairpins. Along the series connection direction of the multiple flat wire hairpins, the second hairpin is connected between the third hairpin and the first hairpin in each branch of each phase winding, the span of the first hairpin and the third hairpin is y, the span of some of the second hairpins is y-1, and the span of some of the second hairpins is y-4.

4. The stator assembly according to claim 3, characterized in that: The number of slots z of the short distance is 2, the span of the first card and the third card is 7, and the span of the second card includes 5 and 8; The span between the two welding parts of any flat wire hairpin is 7.

5. The stator assembly according to claim 3, characterized in that: The slot layers where the two plug-in parts of the first hairpin and the third hairpin are located are respectively the same slot layer; The slot layer where the two plug-in parts of the second hairpin are located is two adjacent stator slots.

6. The stator assembly according to claim 1, characterized in that The multi-phase windings include a first phase winding, a second phase winding and a third phase winding; The adjacent plurality of stator slots include a first slot, a second slot, a third slot, a fourth slot and a fifth slot arranged in sequence along the circumferential direction, and the plurality of plug-in parts in the third slot respectively matched with the plurality of slot layers belong to the second phase winding; The plurality of plug-in parts in the plurality of slot layers of the first slot and the second slot belong to the first phase winding and the second phase winding respectively; The plurality of plug-in portions in the plurality of slot layers of the fourth slot and the fifth slot belong to the second phase winding and the third phase winding, respectively.

7. The stator assembly according to claim 6, characterized in that The plug-in parts belonging to the second phase winding in the first slot and the second slot are located in the same slot layer; The plug-in parts of the second phase winding in the fourth slot and the fifth slot are located in the same slot layer.

8. The stator assembly according to claim 6, characterized in that The plug-in portions belonging to the second phase winding in the first slot and the second slot are radially staggered with the plug-in portions belonging to the second phase winding in the third slot and the fourth slot.

9. The stator assembly according to claim 1, characterized in that: The number M of the stator slots is 72, the 72 stator slots are numbered 1-72 in sequence, the slot layers N of each stator slot are 6, the 6 slot layers are numbered af in sequence from inside to outside along the radial direction of the stator core, and the hairpin is a flat wire hairpin; Each phase winding includes three parallel branches, and the three parallel branches include a first branch, a second branch, and a third branch. In the first branch, the threading positions of the plurality of plug-in parts corresponding to the plurality of flat wire hairpins in the 72 stator slots are as follows: 1f→64f→57e→65d→58c→66b→59a→50a→57b→49c→56d→48e→ 55f→46f→39e→47d→40c→48b→41a→32a→39b→31c→38d→30e→ 37f→28f→21e→29d→22c→30b→23a→14a→21b→13c→20d→12e→ 19f→10f→3e→11d→4c→12b→5a→68d→3b→67c→2d→66e; In the second branch, the threading positions of the plurality of the plug-in parts corresponding to the plurality of the flat wire hairpins in the 72 stator slots are as follows: 2f→65f→58e→66d→59c→64b→57a→48a→55b→50c→57d→49e→ 56f→47f→40e→48d→41c→46b→39a→30a→37b→32c→39d→31e→ 38f→29f→22e→30d→23c→28b→21a→12a→19b→14c→21d→13e→ 20f→11f→4e→12d→5c→10b→3a→66a→1b→68c→3d→67e; In the third branch, the threading positions of the plurality of the plug-in parts corresponding to the plurality of the flat wire hairpins in the 72 stator slots are as follows: 3f→66f→59e→64d→57c→65b→58a→49a→56b→48c→55d→50e→ 57f→48f→41e→46d→39c→47b→40a→31a→38b→30c→37d→32e→ 39f→30f→23e→28d→21c→29b→22a→13a→20b→12c→19d→14e→ 21f→12f→5e→10d→3c→11b→4a→67a→2b→66c→1d→68e.

10. The stator assembly according to claim 9, characterized in that The star point lines of the three branches of the same phase are respectively located in three spatially adjacent stator slots.

11. The stator assembly according to claim 1, characterized in that The lead-out line corresponding to each phase winding is spatially spaced apart from the star point line by 2q stator slots, wherein q is the number of slots per pole and per phase.

12. The stator assembly according to claim 3, characterized in that The flat wire hairpin also includes: Two connecting parts are arranged at the same end of the two plug-in parts corresponding to each flat wire hairpin, and the two connecting parts are connected to each other. Two welding parts are arranged at one end of the two plug-in parts corresponding to each flat wire hairpin away from the connecting part.

13. The stator assembly according to claim 3, characterized in that The welding part comprises: a first welding section and a second welding section, wherein one end of the first welding section is connected to the plug-in portion, and the other end of the first welding section is connected to the second welding section; The two first welding sections included in the second hairpin extend obliquely in a direction approaching each other, and the two second welding sections are parallel.

14. The stator assembly according to claim 3, characterized in that The two welding portions of the first hairpin are bent in the same and parallel directions; The two welding portions of the third hairpin are bent in the same and parallel directions.

15. A motor, characterized in that: Comprising a stator assembly according to any one of claims 1-14.

16. A powertrain, characterized in that: Comprising an electric machine as claimed in claim 15.

17. A vehicle, characterized in that: It comprises the electric machine according to claim 15 or the powertrain according to claim 16.

Images