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 three-phase winding wound on M stator slots of the stator core, each phase winding comprises at least one branch, the insertion parts of a plurality of flat wire hairpins of the plurality of branches of the multi-phase winding are respectively positioned in N slot layers of the stator slots, at least two insertion parts in two adjacent stator slots belong to different phase windings, and the insertion parts of the plurality of flat wire hairpins of the plurality of branches of the multi-phase winding are respectively positioned in N slot layers of the stator slots. Each stator slot includes a first hairpin, at least one second hairpin, and a third hairpin. A part of spans of the first hairpins are y, a part of spans of the first hairpins are y-1, the spans of the second hairpins are y-1, and the spans of the third hairpins are y + 1. Therefore, fifth and seventh harmonics in the magnetic field can be effectively eliminated, and 24-order torque pulsation of the motor can be well suppressed. And the height between the two axial ends of the stator assembly is reduced, the copper consumption is reduced, the cost is reduced, the resistance is reduced, the copper consumption is reduced, and the efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, 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 reduce copper loss and improve efficiency.

[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 the stator assembly of the embodiment of the first aspect of the utility model, it includes: a stator core and a stator winding, wherein M stator slots are formed on the stator core, each of the stator slots includes N slot layers distributed 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; the stator winding includes a three-phase winding wound on the M stator slots of the stator core, each phase winding includes a plurality of flat wire hairpins connected in series, each of the flat wire hairpins includes two plug-in parts inserted in different stator slots, and each slot layer of each stator slot accommodates one plug-in part. Wherein, each phase of the winding includes at least one branch, each branch includes a plurality of flat wire hairpins connected in series in sequence, the plug-in parts of the plurality of flat wire hairpins of the plurality of branches of the multi-phase winding are respectively located in the N slot layers of the stator slot, at least two plug-in parts in two adjacent stator slots belong to windings of different phases, each stator slot includes a first hairpin, at least one second hairpin and a third hairpin arranged in sequence from the inside to the outside in the radial direction, the span of some of the plurality of the first hairpins is y, the span of some of the first hairpins is y-1, the span of the second hairpin is y-1, and the span of the third hairpin is y+1, wherein y is the pitch of the motor.

[0008] According to the stator assembly of the embodiment of the utility model, the stator winding is wound in a short-distance slot manner, 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. 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 flat wire hairpin, reduce the amount of copper used and reduce costs, thereby reducing resistance, reducing copper loss and improving efficiency.

[0009] In some embodiments, the three-phase winding includes a first phase winding, a second phase winding and a third phase winding; the three adjacent stator slots include a first slot, a second slot and a third slot arranged in sequence along the circumferential direction, the multiple plug-in parts in the first slot belong to the first phase winding and the second phase winding respectively, the multiple plug-in parts in the second slot all belong to the second phase winding, and the multiple plug-in parts in the third slot belong to the second phase winding and the third phase winding respectively.

[0010] In some embodiments, the plug-in portion belonging to the second phase winding in the first slot and the plug-in portion belonging to the second phase winding in the third slot are arranged staggered in the radial direction.

[0011] In some embodiments, the multiple plug-in portions in the first slot respectively belonging to the first phase winding and the second phase winding are arranged alternately in the radial direction; the multiple plug-in portions in the third slot respectively belonging to the second phase winding and the third phase winding are arranged alternately in the radial direction.

[0012] In some embodiments, the number of the plug-in parts respectively belonging to the first phase winding and the second phase winding in the first slot is the same; the number of the plug-in parts respectively belonging to the second phase winding and the third phase winding in the third slot is the same.

[0013] In some embodiments, the slot layers where the two plug-in parts corresponding to the first hair card and the third hair card are located are the same layer; the slot layers where the two plug-in parts of the second hair card are located are two adjacent slot layers.

[0014] In some embodiments, the first hairpin includes a first sub-card and a second sub-card, the span of the first sub-card is y-1, the span of the second sub-card is y, the span of the third hairpin is greater than the span of the first sub-card, and the span of the third hairpin is greater than the span of the second sub-card.

[0015] In some embodiments, the span of the first sub-card is 5, the span of the second sub-card is 6, and the span of the third sub-card is 7.

[0016] In some embodiments, the number of the stator slots is 48, each of the stator slots includes 6 slot layers, and the stator assembly is configured to match a motor with 8 motor poles; the 48 stator slots of the stator core are numbered 1-48 in sequence, and the 6 slot layers of the stator slots are defined as af from the radial inner side to the outer side of the stator core;

[0017] In the first phase winding, the threading positions of the plurality of the plug-in parts corresponding to the plurality of flat wire hairpins in the 48 stator slots are as follows:

[0018] 1f→42f→37e→42d→37c→42b→37a→32a→37b→32c→37d→32e→

[0019] 37f→30f→25e→30d→25c→30b→25a→20a→25b→20c→25d→20e→

[0020] 25f→18f→13e→18d→13c→18b→13a→19a→24b→19c→24d→19e→

[0021] 24f→31f→26e→31d→26c→31b→26a→31a→36b→31c→36d→31e→

[0022] 36f→43f→38e→43d→38c→43b→38a→43a→48b→43c→48d→43e→

[0023] 48f→7f→2e→7d→2c→7b→2a→7a→12b→7c→12d→7e→

[0024] 12f→19f→14e→19d→14c→19b→14a→8a→13b→8c→13d→8e→

[0025] 13f→6f→1e→6d→1c→6b→1a→44a→1b→44c→1d→44e.

[0026] In some embodiments, the star point line and the lead-out line corresponding to each phase winding of the stator assembly are spatially separated by 2q stator slots, where q is the number of slots per pole per phase.

[0027] In some embodiments, one ends of the two plug-in parts of the first hair card, the second hair card and the third hair card are connected to each other, and the other ends of the two plug-in parts of the first hair card, the second hair card and the third hair card are spaced apart from each other.

[0028] In some embodiments, a plurality of the flat wire hairpins are welded at the same end located in the axial direction of the stator assembly.

[0029] The motor according to the second aspect of the present invention comprises the stator assembly described in any one of the above embodiments.

[0030] The power assembly according to the embodiment of the third aspect of the utility model includes the motor described in the above embodiment.

[0031] The vehicle according to the fourth aspect of the present invention comprises the powertrain described in the above embodiment.

[0032] 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

[0033] 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:

[0034] Figure 1 It is a schematic diagram of the stator winding of an embodiment of the utility model.

[0035] Figure 2 yes Figure 1 Schematic diagram of the enlarged P region.

[0036] Figure 3 It is a schematic diagram of the first phase winding of an embodiment of the utility model.

[0037] Figure 4 Schematic diagram of the second phase winding of the embodiment of the utility model.

[0038] Figure 5 Schematic diagram of the third phase winding of the embodiment of the utility model.

[0039] Figure 6 It is a schematic diagram of a flat wire hairpin in an embodiment of the utility model arranged in a stator core.

[0040] Figure 7 It is a schematic diagram of the first sub-issuing card of an embodiment of the utility model.

[0041] Figure 8 It is a schematic diagram of the second sub-issuing card of the embodiment of the utility model.

[0042] Fig. 9 It is a schematic diagram of the second card issuing embodiment of the utility model.

[0043] Fig.10 It is a schematic diagram of the third card issuing embodiment of the utility model.

[0044] Reference numerals:

[0045] 1. Stator assembly;

[0046] 10. stator core; 11. stator slot; 111. first slot; 112. second slot; 113. third slot;

[0047] 20. stator winding; 21. flat wire hairpin; 211. first hairpin; 2111. first sub-hairpin; 2112. second sub-hairpin; 212. second hairpin; 213. third hairpin; 214. connecting part; 215. plug-in part; 216. welding part; 22. first phase winding; 23. second phase winding; 24. third phase winding. DETAILED DESCRIPTION

[0048] 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 .

[0049] Specifically, if Figure 1 and Figure 2 As shown, M stator slots 11 are formed on the stator core 10, and each stator slot 11 includes N slot layers spaced apart along the radial direction of the stator core 10, where M is a multiple of 3 and an even number, and N is an even number. Each stator slot 11 penetrates the stator core 10 along the axial direction of the stator core 10, and the stator core 10 is formed with a through hole for accommodating the mover core and the mover winding, and the stator slot 11 is connected to the through hole along the radial direction of the stator core 10. The stator winding 20 includes a three-phase winding wound on the M stator slots 11 of the stator core 10, each phase winding is different from each other in electrical phase, and each phase winding includes a plurality of flat wire hairpins 21 arranged alternately along the circumferential direction of the stator core 10.

[0050] Each phase winding includes a plurality of flat wire hairpins 21 connected in series. Each flat wire hairpin 21 includes two plug-in portions 215 inserted in different stator slots 11. Each slot layer of each stator slot 11 accommodates a plug-in portion 215. Each stator slot 11 can accommodate N plug-in portions 215, and the N plug-in portions 215 are respectively matched with corresponding slot layers. Among them, each phase winding includes at least one branch, each branch includes a plurality of flat wire hairpins 21 connected in series in sequence, the plug-in parts 215 of the plurality of flat wire hairpins 21 of the plurality of branches of the multi-phase winding are respectively located in N slot layers of the stator slot 11, and at least two plug-in parts 215 in two adjacent stator slots 11 belong to different phase windings, that is, in two adjacent stator slots 11 along the circumferential direction of the stator core 10, the plug-in parts 215 in the slot layer of each stator slot 11 belong to at least one phase winding, and at least one of the plug-in parts 215 in two adjacent stator slots 11 belongs to a different phase winding.

[0051] In the embodiment of the present application, two adjacent stator slots 11 respectively have three plug-in portions 215 belonging to different phase windings, and respectively have three plug-in portions 215 belonging to the same phase winding, and the three plug-in portions 215 belonging to the same phase winding in the two stator slots 11 are respectively located in the same slot layer of the two stator slots 11.

[0052] Each stator slot 11 includes a first hairpin 211, at least one second hairpin 212, and a third hairpin 213 arranged in sequence from the inside to the outside in the radial direction. The first hairpin 211, the second hairpin 212, and the third hairpin 213 in each phase winding are connected in series in a preset order. The span of some of the first hairpins 211 in the plurality of first hairpins 211 is y, the span of some of the first hairpins 211 is y-1, the span of the second hairpin 212 is y-1, and the span of the third hairpin 213 is y+1, where y is the pitch of the motor. Wherein, the pitch of the motor y=M / 2p, 2p is the number of poles of the motor.

[0053] The two plug-in parts 215 of the first hairpin 211 and the two plug-in parts 215 of the third hairpin 213 of the two spans are located in the same slot layer, and the two plug-in parts 215 of the second hairpin 212 are located in two adjacent slot layers.

[0054] According to the stator assembly 1 of the embodiment of the utility model, the stator winding 20 is wound in a short-distance stator slot 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. In addition, the connection of the entire 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.

[0055] In some embodiments, Figure 6 As shown, the three-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 three adjacent stator slots 11 include a first slot 111, a second slot 112 and a third slot 113 arranged in sequence along the circumferential direction. The multiple plug-in parts 215 in the first slot 111 belong to the first phase winding 22 and the second phase winding 23 respectively, the multiple plug-in parts 215 in the second slot 112 all belong to the second phase winding 23, and the multiple plug-in parts 215 in the third slot 113 belong to the second phase winding 23 and the third phase winding 24 respectively.

[0056] For example, each stator slot 11 has 6 slot layers, and the three plug-in parts 215 belonging to the first phase winding 22 in the first slot 111 are respectively located in the second slot layer, the fourth slot layer and the sixth slot layer, and the corresponding three plug-in parts 215 belonging to the second phase winding 23 in the second slot 112 are respectively located in the second slot layer, the fourth slot layer and the sixth slot layer. The three plug-in parts 215 belonging to the second phase winding 23 in the third slot 113 are respectively located in the first slot layer, the third slot layer and the fifth slot layer, and the corresponding three plug-in parts 215 belonging to the second phase winding 23 in the second slot 112 are respectively located in the first slot layer, the third slot layer and the fifth slot layer. That is, 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 a short moment stator slot 11. 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.

[0057] In some embodiments, Figure 2 As shown, the plug-in portion 215 belonging to the second phase winding 23 in the first slot 111 and the plug-in portion 215 belonging to the second phase winding 23 in the third slot 113 are arranged in a radially staggered manner. For example, since the number of slot layers in each stator slot 11 is the same, the number of slot layers of each stator slot 11 in the present application is 6, and taking the three plug-in portions 215 belonging to the second phase winding 23 in the first slot 111 as an example, which are respectively located in the second slot layer, the fourth slot layer, and the sixth slot layer, the three plug-in portions 215 belonging to the second phase winding 23 in the third slot 113 are respectively located in the first slot layer, the third slot layer, and the fifth slot layer.

[0058] Of course, the three plug-in parts 215 belonging to the second phase winding 23 in the first slot 111 can be located in the first slot layer, the second slot layer and the third slot layer respectively, and at this time, the three plug-in parts 215 belonging to the second phase winding 23 in the third slot 113 can be located in the fourth slot layer, the fifth slot layer and the sixth slot layer respectively. That is, the several plug-in parts 215 belonging to the second phase winding 23 in the first slot 111 and the several plug-in parts 215 belonging to the second phase winding 23 in the third slot 113 are staggered along the radial direction of the stator core 10. In this way, it is convenient to set different phase windings on the stator core 10, reduce the number and types of flat wire hairpins 21, and reduce the difficulty of the manufacturing process.

[0059] In some embodiments, the multiple plug-in portions 215 in the first slot 111 that belong to the first phase winding 22 and the second phase winding 23 are arranged alternately along the radial direction; the multiple plug-in portions 215 in the third slot 113 that belong to the second phase winding 23 and the third phase winding 24 are arranged alternately along the radial direction. That is, the plug-in portion 215 belonging to the first phase winding 22 in the first slot 111 and the plug-in portion 215 belonging to the second phase winding 23 in the third slot 113 are located in the same slot layer, and the plug-in portion 215 belonging to the second phase winding 23 in the first slot 111 and the plug-in portion 215 belonging to the third phase winding 24 in the third slot 113 are located in the same slot layer, so that when the flat wire hairpin 21 in the second slot 112 is short of one stator slot 11, the plug-in portion 215 belonging to the second phase winding 23 in the second slot 112 can be opposite to the plug-in portion 215 in the corresponding slot layer of one of the first slot 111 and the third slot 113, and the remaining plug-in portions 215 belonging to the second phase winding 23 can be opposite to the plug-in portion 215 in the corresponding slot layer of the other of the first slot 111 and the third slot 113.

[0060] In some embodiments, the number of plug-in parts 215 belonging to the first phase winding 22 and the second phase winding 23 in the first slot 111 is the same; the number of plug-in parts 215 belonging to the second phase winding 23 and the third phase winding 24 in the third slot 113 is the same. That is, the plug-in parts 215 belonging to the second phase winding 23 or the first phase winding 22 in the first slot 111 occupy half of the number of slot layers of the first slot 111, and the plug-in parts 215 belonging to the second phase winding 23 or the third phase winding 24 in the third slot 113 occupy half of the number of slot layers of the third slot 113. That is, except for the stator slots 11 in which the plug-in parts 215 arranged in all slot layers belong to the same phase winding, the plug-in parts 215 in the slot layers in other stator slots 11 are arranged in two different phase windings.

[0061] In some embodiments, the slot layers where the two plug-in parts 215 corresponding to the first hairpin 211 and the third hairpin 213 are located are the same layer; the slot layers where the two plug-in parts 215 of the second hairpin 212 are located are two adjacent slot layers. In the embodiment of the present application, the two plug-in parts 215 of the first hairpin 211 are located in the first slot layer of different stator slots 11, the two plug-in parts 215 of the third hairpin 213 are located in the sixth slot layer of different stator slots 11, and the two plug-in parts 215 of the second hairpin 212 are respectively located in the adjacent slot layers of different stator slots 11. For example, the two plug-in parts 215 of the second hairpin 212 are respectively located in the second slot layer and the third slot layer or the fourth slot layer and the fifth slot layer of different stator slots 11.

[0062] In some embodiments, in combination Figure 7 and Figure 8The first hairpin 211 includes a first hairpin sub-card 2111 and a second hairpin sub-card 2112, and the first hairpin sub-card 2111 and the second hairpin sub-card 2112 have different spans. The span of the first hairpin sub-card 2111 is y-1, and the span of the second hairpin sub-card 2112 is y. The span of the third hairpin 213 is greater than the span of the first hairpin sub-card 2111, and the span of the third hairpin 213 is greater than the span of the second hairpin sub-card 2112. In the embodiment of the present application, the span of the first hairpin sub-card 2111 is 5, the span of the second hairpin sub-card 2112 is 6, and the span of the third hairpin 213 is 7. The span of the second hairpin 212 is 5.

[0063] In some embodiments, the number of stator slots 11 is 48, each stator slot 11 includes 6 slot layers, and the stator assembly 1 is configured to match a motor with 8 motor poles; the 48 stator slots 11 of the stator core 10 are numbered 1-48 in sequence, and the 6 slot layers of the stator slots 11 are defined as af in sequence from the radial inner side to the outer side of the stator core 10;

[0064] like Figure 3 As shown, in the first phase winding 22, the threading positions of the plurality of plug-in portions 215 corresponding to the plurality of flat wire hairpins 21 in the 48 stator slots 11 are as follows:

[0065] 1f→42f→37e→42d→37c→42b→37a→32a→37b→32c→37d→32e→

[0066] 37f→30f→25e→30d→25c→30b→25a→20a→25b→20c→25d→20e→

[0067] 25f→18f→13e→18d→13c→18b→13a→19a→24b→19c→24d→19e→

[0068] 24f→31f→26e→31d→26c→31b→26a→31a→36b→31c→36d→31e→

[0069] 36f→43f→38e→43d→38c→43b→38a→43a→48b→43c→48d→43e→

[0070] 48f→7f→2e→7d→2c→7b→2a→7a→12b→7c→12d→7e→

[0071] 12f→19f→14e→19d→14c→19b→14a→8a→13b→8c→13d→8e→

[0072] 13f→6f→1e→6d→1c→6b→1a→44a→1b→44c→1d→44e.

[0073] like Figure 4 In the second phase winding 23, the threading positions of the plurality of plug-in portions 215 corresponding to the plurality of flat wire hairpins 21 in the 48 stator slots 11 are as follows:

[0074] 5f→46f→41e→46d→41c→46b→41a→36a→41b→36c→41d→36e→

[0075] 41f→34f→29e→34d→29c→34b→29a→35a→40b→35c→40d→35e→

[0076] 40f→47f→42e→47d→42c→47b→42a→47a→4b→47c→4d→47e→

[0077] 4f→11f→6e→11d→6c→11b→6a→11a→16b→11c→16d→11e→

[0078] 16f→23f→18e→23d→18c→23b→18a→23a→28b→23c→28d→23e→

[0079] 28f→35f→30e→35d→30c→35b→30a→24a→29b→24c→29d→24e→

[0080] 29f→22f→17e→22d→17c→22b→17a→12a→17b→12c→17d→12e→

[0081] 17f→10f→5e→10d→5c→10b→5a→48a→5b→48c→5d→48e.

[0082] like Figure 5 In the third phase winding 24, the threading positions of the plurality of plug-in portions 215 corresponding to the plurality of flat wire hairpins 21 in the 48 stator slots 11 are as follows:

[0083] 9f→2f→45e→2d→45c→2b→45a→3a→8b→3c→8d→3e→

[0084] 8f→15f→10e→15d→10c→15b→10a→15a→20b→15c→20d→15e→

[0085] 20f→27f→22e→27d→22c→27b→22a→27a→32b→27c→32d→27e→

[0086] 32f→39f→34e→39d→34c→39b→34a→39a→44b→39c→44d→39e→

[0087] 44f→3f→46e→3d→46c→3b→46a→40a→45b→40c→45d→40e→

[0088] 45f→38f→33e→38d→33c→38b→33a→28a→33b→28c→33d→28e→

[0089] 33f→26f→21e→26d→21c→26b→21a→16a→21b→16c→21d→16e→

[0090] 21f→14f→9e→14d→9c→14b→9a→4a→9b→4c→9d→4e.

[0091] In some embodiments, the star point line and the lead line corresponding to each phase winding of the stator assembly 1 are spaced apart by 2q stator slots 11, where q is the number of slots per pole per phase. Here, q=48 / 8 / 3=2, that is, the interval between the star point line and the lead line corresponding to each phase winding is 4 stator slots 11.

[0092] Combination Figure 3-Figure 5 In 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. All the lead wires of the three-phase winding are distributed in the sixth slot layer of different stator slots 11, and all the star point lines of the three-phase winding are distributed in the fifth slot layer of different stator slots 11, so as to facilitate the welding of different lead wires and star point lines.

[0093] In some embodiments, in combination Figure 7 , Figure 8 and Fig.10, one ends of the two plug-in parts 215 of the first hairpin 211, the second hairpin 212 and the third hairpin 213 are connected to each other, and the other ends of the two plug-in parts 215 of the first hairpin 211, the second hairpin 212 and the third hairpin 213 are spaced apart from each other. That is, since the first hairpin 211 and the third hairpin 213 are respectively located at the outermost layer and the innermost layer of the plurality of slot layers, the plurality of first hairpins 211 and the plurality of third hairpins 213 are arranged along the circumferential direction of the stator core 10, and the two plug-in parts 215 of the first hairpin 211 and the third hairpin 213 belonging to the same phase winding are respectively connected to the plug-in parts 215 of the adjacent flat wire hairpin 21. The two plug-in parts 215 included in the first hairpin 211 and the third hairpin 213 are connected at only one end along the axial direction of the stator core 10, and the other ends are arranged at intervals to facilitate the first hairpin 211 and the third hairpin 213 to be respectively connected to the plug-in parts 215 of the flat wire hairpin 21 of the adjacent phase winding.

[0094] like Fig. 9 As shown, one end of the two plug-in parts 215 of the second hairpin 212 is connected to each other, and the other end is spaced apart from each other. That is, the two plug-in parts 215 of the second hairpin 212 connected between different slot layers are connected to each other at one end along the axial direction of the stator core 10, and the other end is spaced apart from each other along the radial direction of the stator core 10, that is, they are located in different slot layers of the same stator slot 11, and two flat wire hairpins 21 adjacent to the second hairpin 212 and belonging to the same phase winding are respectively connected to the other end of the second hairpin 212, so as to realize the series connection between the multiple flat wire hairpins 21 included in the different phase windings.

[0095] That is, the plug-in portions 215 of the plurality of flat wire hairpins 21 of the plurality of branches of the multi-phase winding are welded at the same end located in the axial direction of the stator assembly 1 .

[0096] Specifically, refer to Figure 7-10 Each flat wire hairpin 21 includes two plug-in parts 215 and a connecting part 214 and a welding part 216 respectively connected to both ends of each plug-in part 215. The two connecting parts 214 included in each flat wire hairpin 21 are respectively connected to the same end of the two plug-in parts 215, and the two welding parts 216 included in each flat wire hairpin 21 are respectively connected to one end of the two plug-in parts 215 away from the connecting part 214. Among them, the two welding parts 216 of the first hairpin 211 and the second hairpin 212 are spaced apart from each other and bent in the same direction, and the two welding parts 216 of the second hairpin 212 are close to each other at one end away from the connecting part 214, and are spaced apart along the radial direction of the stator core 10. Therefore, the flat wire hairpins 21 are welded at the same end of the axial direction of the stator core 10, which reduces the welding process and facilitates the rapid realization of the series connection between different flat wire hairpins 21.

[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 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 M stator slots are formed on the stator core, each of the stator slots includes 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 three-phase winding wound on M stator slots of the stator core, each phase winding comprising a plurality of flat wire hairpins connected in series, each of the flat wire hairpins comprising two plug-in parts inserted in different stator slots, and each slot layer of each stator slot accommodates one of the plug-in parts; Wherein, each phase of the winding includes at least one branch, each branch includes a plurality of flat wire hairpins connected in series in sequence, the plug-in parts of the plurality of flat wire hairpins of the plurality of branches of the multi-phase winding are respectively located in the N slot layers of the stator slot, and at least two of the plug-in parts in two adjacent stator slots belong to windings of different phases, Each of the stator slots includes a first hairpin, at least one second hairpin and a third hairpin arranged in sequence from the inside to the outside in the radial direction, a span of some of the first hairpins among the plurality of the first hairpins is y, a span of some of the first hairpins is y-1, a span of the second hairpin is y-1, and a span of the third hairpin is y+1, wherein y is the pitch of the motor.

2. The stator assembly according to claim 1, characterized in that: The three-phase winding includes a first phase winding, a second phase winding and a third phase winding; The three adjacent stator slots include a first slot, a second slot and a third slot arranged in sequence along the circumferential direction, the multiple plug-in parts in the first slot belong to the first phase winding and the second phase winding respectively, the multiple plug-in parts in the second slot all belong to the second phase winding, and the multiple plug-in parts in the third slot belong to the second phase winding and the third phase winding respectively.

3. The stator assembly according to claim 2, characterized in that: The plug-in portion belonging to the second phase winding in the first slot and the plug-in portion belonging to the second phase winding in the third slot are arranged staggered in the radial direction.

4. The stator assembly according to claim 2, characterized in that: The plurality of plug-in portions in the first slot, respectively belonging to the first phase winding and the second phase winding, are alternately arranged in the radial direction; The plurality of plug-in portions in the third slot, which respectively belong to the second phase winding and the third phase winding, are alternately arranged in the radial direction.

5. The stator assembly according to claim 2, characterized in that: The numbers of the plug-in parts respectively belonging to the first phase winding and the second phase winding in the first slot are the same; The numbers of the plug-in parts respectively belonging to the second phase winding and the third phase winding in the third slot are the same.

6. The stator assembly according to claim 1, characterized in that The slot layer where the two plug-in parts corresponding to the first hairpin and the third hairpin are located is the same layer; The slot layers where the two plug-in parts of the second hairpin are located are two adjacent slot layers.

7. The stator assembly according to claim 6, characterized in that The first card includes a first sub-card and a second sub-card, the span of the first sub-card is y-1, the span of the second sub-card is y, the span of the third card is greater than the span of the first sub-card, and the span of the third card is greater than the span of the second sub-card.

8. The stator assembly according to claim 7, characterized in that The span of the first sub-card is 5, the span of the second sub-card is 6, and the span of the third sub-card is 7.

9. The stator assembly according to claim 2, characterized in that: The number of the stator slots is 48, each of the stator slots includes 6 slot layers, and the stator assembly is configured to match a motor with 8 poles; The 48 stator slots of the stator core are numbered 1-48 in sequence, and the 6 slot layers of the stator slots are defined as af from the radial inner side to the outer side of the stator core in sequence; In the first phase winding, the threading positions of the plurality of the plug-in parts corresponding to the plurality of flat wire hairpins in the 48 stator slots are as follows: 1f→42f→37e→42d→37c→42b→37a→32a→37b→32c→37d→32e→ 37f→30f→25e→30d→25c→30b→25a→20a→25b→20c→25d→20e→ 25f→18f→13e→18d→13c→18b→13a→19a→24b→19c→24d→19e→ 24f→31f→26e→31d→26c→31b→26a→31a→36b→31c→36d→31e→ 36f→43f→38e→43d→38c→43b→38a→43a→48b→43c→48d→43e→ 48f→7f→2e→7d→2c→7b→2a→7a→12b→7c→12d→7e→ 12f→19f→14e→19d→14c→19b→14a→8a→13b→8c→13d→8e→ 13f→6f→1e→6d→1c→6b→1a→44a→1b→44c→1d→44e.

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

11. The stator assembly according to claim 1, characterized in that One ends of the two plug-in parts of the first hair card, the second hair card and the third hair card are connected to each other, and the other ends of the two plug-in parts of the first hair card, the second hair card and the third hair card are spaced apart from each other.

12. The stator assembly according to any one of claims 1 to 11, characterized in that: A plurality of the flat wire hairpins are welded at the same end of the stator assembly in the axial direction.

13. A motor, characterized in that: Comprising a stator assembly according to any one of claims 1-12.

14. A powertrain, characterized in that: Comprising an electric machine according to claim 13.

15. A vehicle, characterized in that: Comprising a powertrain according to claim 14.

Images