Rotor punching sheet, rotor, motor, power assembly and vehicle

Abstract

The utility model belongs to the technical field of rotors, and particularly relates to a rotor punching sheet, a rotor, a motor, a power assembly and a vehicle. The rotor punching sheet comprises a plurality of magnetic poles arranged along the circumferential direction of the rotor punching sheet, each magnetic pole is provided with a magnetic steel groove group, a first groove and a slotted hole, each magnetic pole is provided with a d axis and a q axis, the magnetic poles are symmetrical about the d axis, and the adjacent magnetic poles are symmetrical about the q axis; the first groove is arranged at the intersection of the outer edge of the magnetic pole and the d shaft, the first groove is arranged at the outer side of the magnetic steel groove group in the radial direction of the rotor punching sheet, and the q shaft passes through the groove hole. According to the utility model, through the combination of the first grooves on the d-axis and the slotted holes on the q-axis, magnetic field forces in the tangential direction and the radial direction brought by a harmonic magnetic field can be reduced, lower air gap flux density and harmonic content are obtained, the torque pulsation and the radial force of the rotor punching sheet are reduced, and the purpose of reducing motor noise is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of rotors, and in particular relates to a rotor punching sheet, a rotor, a motor, a power assembly and a vehicle. Background Art

[0002] The noise of the motor will affect the comfort of the electric vehicle. The rotor of the motor includes rotor punchings, and the structural design of the rotor punchings will directly affect the noise level of the motor. Therefore, how to set the structure of the rotor punchings to reduce the noise of the motor is an urgent problem to be solved by people in the field of this technology. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a rotor punching sheet, a rotor, a motor, a power assembly and a vehicle to reduce the noise of the motor.

[0004] In order to solve the above technical problems, on the one hand, an embodiment of the utility model provides a rotor punching, comprising a plurality of magnetic poles arranged along the circumference of the rotor punching, wherein the magnetic poles are provided with a magnetic steel slot group, a first groove and a slot hole, and the magnetic poles have a d-axis and a q-axis extending in a radial direction, the magnetic poles are symmetrical about the d-axis, and adjacent magnetic poles are symmetrical about the q-axis;

[0005] The first groove is arranged at the intersection of the outer edge of the magnetic pole and the d-axis, and the first groove is located outside the magnetic steel slot group in the radial direction of the rotor punching sheet, and the q-axis passes through the slot hole.

[0006] Optionally, the first groove includes a first auxiliary groove and a second auxiliary groove, and the first auxiliary groove is connected to the second auxiliary groove.

[0007] Optionally, both the first auxiliary groove and the second auxiliary groove are arc-shaped grooves;

[0008] The first auxiliary groove and the second auxiliary groove are symmetrically arranged about the d-axis.

[0009] Optionally, the length L of the first auxiliary groove in the circumferential direction of the rotor punching sheet is 11 The depth H of the first auxiliary groove in the radial direction of the rotor punching is 0.1-1 mm. 11 It is 0.3~0.5mm.

[0010] Optionally, the length L of the second auxiliary groove in the circumferential direction of the rotor punching sheet is 12 The depth H of the second auxiliary groove in the radial direction of the rotor punching is 0.1-1 mm. 12 It is 0.3~0.5mm.

[0011] Optionally, the d-axis passes through the intersection of the first auxiliary groove and the second auxiliary groove, and the depth H of the intersection in the radial direction of the rotor punching is 13 (0.8~0.9)*H 11 .

[0012] Optionally, two slots are provided, and the magnetic pole has two side edges extending in the radial direction, and one slot is correspondingly provided on each side edge, so that the slots of two adjacent magnetic poles are surrounded to form a through hole.

[0013] Optionally, the hole wall of the slot hole includes a first edge, a second edge and a transition portion, the first edge is arranged between the side edge and one end of the transition portion, and the second edge is arranged between the side edge and the other end of the transition portion.

[0014] Optionally, the distance L between the first edge and the outer edge of the rotor punch on the q axis is 01 is 0.8-1 mm, the distance H0 between the first edge and the second edge on the q-axis is 0.6-1.2 mm, and the distance L between the transition portion and the q-axis is 02 For L min *(0.5~0.8);

[0015] Among them, L min is the minimum distance between the magnetic steel slot group and the q-axis.

[0016] Optionally, the first edge is perpendicular to the side edge.

[0017] Optionally, the second edge includes a first straight line segment and a first arc segment, one end of the first arc segment is located on the side, the first straight line segment is connected between the other end of the first arc segment and the transition portion, and the first straight line segment and the first edge form an acute angle.

[0018] Optionally, the transition portion is arc-shaped.

[0019] Optionally, the magnetic steel slot group includes two first magnetic steel slots arranged on the same magnetic pole, and the two first magnetic steel slots arranged on the same magnetic pole are symmetrically arranged about the d axis, and a magnetic isolation bridge is formed between one end of each of the first magnetic steel slots and the outer edge of the magnetic pole, and a second groove is respectively opened on the outer edge of the magnetic pole corresponding to each of the magnetic isolation bridges.

[0020] Optionally, on the same magnetic pole, two second grooves are arranged symmetrically about the d-axis.

[0021] Optionally, a length L2 of the second groove in the circumferential direction of the rotor punching is 1 to 3 mm, and a depth H2 of the second groove in the radial direction of the rotor punching is 0.3 to 0.5 mm.

[0022] Optionally, the second groove is an arc-shaped groove.

[0023] Optionally, the magnetic steel slot group further includes two second magnetic steel slots arranged on the same magnetic pole, the two second magnetic steel slots are symmetrically arranged about the d axis, and the first magnetic steel slot is located on the inner side of the second magnetic steel slot in the radial direction of the magnetic pole;

[0024] A third groove is respectively arranged between one end of each second magnetic steel groove close to the outer edge of the magnetic pole and the first groove; a fourth groove is respectively arranged between one end of each second magnetic steel groove close to the outer edge of the magnetic pole and the second groove.

[0025] Optionally, a length L3 of the third groove in the circumferential direction of the rotor punching is 1 to 3 mm, and a depth H3 of the third groove in the radial direction of the rotor punching is 0.3 to 0.5 mm.

[0026] Optionally, a length L4 of the fourth groove in the circumferential direction of the rotor punch is 1 to 3 mm, and a depth H4 of the fourth groove in the radial direction of the rotor punch is 0.3 to 0.5 mm.

[0027] On the other hand, an embodiment of the present invention provides a rotor, comprising a plurality of rotor punchings as described above, wherein the plurality of rotor punchings are stacked along the axial direction thereof.

[0028] On the other hand, an embodiment of the present invention provides a motor, comprising a stator and the rotor as described above.

[0029] Optionally, the stator comprises a stator core, a stator winding and a lead wire module, the stator winding is arranged on the stator core, and the lead wire module is arranged at one axial end of the stator core;

[0030] The stator winding includes an A-phase winding, a B-phase winding and a C-phase winding; each phase of the winding includes a first branch and a second branch connected in parallel, both ends of the first branch and the second branch have lead wires and a star point line, and the lead wires of the first branch and the second branch are connected to the lead wire module;

[0031] The star point lines of the first branches of the different phase windings are connected to each other, and the star point lines of the second branches of the different phase windings are connected to each other.

[0032] Optionally, the stator core is provided with M stator slots spaced apart along the circumferential direction thereof, the stator winding is wound in the M stator slots, and each of the stator slots has N slot layers arranged along the radial direction of the stator core; wherein M is a multiple of 3 and an even number, and N≥4;

[0033] In the radial direction of the stator core, the slot layer corresponding to the star point line is located on the inner side of the slot layer corresponding to the lead wire.

[0034] Optionally, M is 72 and N is 6;

[0035] The 72 stator slots are numbered 1-72 in sequence, and the 6 slot layers are numbered af in sequence from the radial inner side to the radial outer side of the stator core;

[0036] The connection mode of the first branch of the A-phase winding is:

[0037] 1f->11f->20e->28d->37c->45b->54a->63a->54b->46c->37d->29e->20f->30f->39e->47d->56c->64b->1a->10a-> 1b->65c->56d->48e->39f->46f->55e->63d->72c->8b->17a->26a->17b->9c->72d->64e->55f->65f->2e->10d->19c ->27b->36a->45a->36b->28c->19d->11e>2f->12f->21e->29d->38c->46b->55a->64a->55b->47c->38d->30e->21f->28f->37e->45d->54c->62b->71a->8a->71b->63c->54d->46e; wherein 1f is connected to the first branch lead-out line of the A-phase winding, and 46e is connected to the first branch star point line of the A-phase winding;

[0038] The connection mode of the second branch of the A-phase winding is:

[0039] 37f->47f->56e->64d->1c->9b->18a->27a->18b->10c->1d->65e->56f->66f->3e->11d->20c->28b->37a->46a->37 b->29c->20d->12e->3f->10f->19e->27d->36c->44b->53a->62a->53b->45c->36d->28e->19f->29f->38e->46d->55 c->63b->72a->9a->72b->64c->55d->47e->38f->48f->57e->65d->2c->10b->19a->28a->19b->11c->2d->66e->57f->64f->1e->9d->18c->26b->35a->44a->35b->27c->18d->10e; wherein 37f is connected to the second branch lead-out line of the A-phase winding, and 10e is connected to the second branch star point line of the A-phase winding.

[0040] Optionally, the first branch lead wire of the A-phase winding differs from the first branch lead wire of the B-phase winding by 6 stator slots in the circumferential direction of the stator core, and the first branch lead wire of the B-phase winding differs from the first branch lead wire of the C-phase winding by 6 stator slots in the circumferential direction of the stator core;

[0041] The first branch star point line of the A-phase winding differs from the first branch star point line of the B-phase winding by 6 stator slots in the circumferential direction of the stator core, and the first branch star point line of the B-phase winding differs from the first branch star point line of the C-phase winding by 6 stator slots in the circumferential direction of the stator core;

[0042] The second branch lead wire of the A-phase winding differs from the second branch lead wire of the B-phase winding by 6 stator slots in the circumferential direction of the stator core, and the second branch lead wire of the B-phase winding differs from the second branch lead wire of the C-phase winding by 6 stator slots in the circumferential direction of the stator core;

[0043] The second branch star point line of the A-phase winding differs from the second branch star point line of the B-phase winding by 6 stator slots in the circumferential direction of the stator core, and the second branch star point line of the B-phase winding differs from the second branch star point line of the C-phase winding by 6 stator slots in the circumferential direction of the stator core.

[0044] On the other hand, an embodiment of the present invention provides a power assembly, comprising the motor as described above.

[0045] On the other hand, an embodiment of the present invention provides a vehicle, comprising the powertrain as described above or the motor as described above.

[0046] The rotor punching of the embodiment of the utility model can reduce the magnetic field force in the tangential direction and radial direction caused by the harmonic magnetic field through the combination of the first groove on the d-axis and the slot hole on the q-axis, obtain a lower air gap magnetic density and harmonic content, reduce the torque pulsation and radial force of the rotor punching, and achieve the purpose of reducing motor noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of a rotor punching provided by an embodiment of the utility model;

[0048] Figure 2 It is a schematic diagram of a magnetic pole provided by an embodiment of the utility model;

[0049] Figure 3 is a schematic diagram of a first groove provided in an embodiment of the utility model;

[0050] Figure 4 is a schematic diagram of a third groove provided in an embodiment of the utility model;

[0051] Figure 5 is a schematic diagram of a fourth groove provided in an embodiment of the utility model;

[0052] Figure 6 It is a schematic diagram of a second groove and a slot hole provided in an embodiment of the utility model;

[0053] Figure 7 It is a schematic diagram of a stator provided by an embodiment of the utility model;

[0054] Figure 8 It is a schematic diagram of a stator core provided by an embodiment of the utility model;

[0055] Fig. 9 This is a wiring diagram of the A-phase winding provided by an embodiment of the utility model;

[0056] Fig.10 This is a wiring diagram of the B-phase winding provided by an embodiment of the utility model;

[0057] Fig.11 This is a wiring diagram of a C-phase winding provided in one embodiment of the utility model.

[0058] The reference numerals in the specification are as follows:

[0059] 1. Rotor punching;

[0060] 10. Through hole;

[0061] 11. magnetic pole; 111. magnetic steel slot group; 1111. first magnetic steel slot; 1112. second magnetic steel slot; 112. first groove; 1121. first auxiliary groove; 1122. second auxiliary groove; 113. slot hole; 1131. first edge; 1132. second edge; 11321. first straight line segment; 11322. first arc segment; 1133. transition portion; 114. second groove; 115. third groove; 116. fourth groove;

[0062] 2. Stator;

[0063] 21. Stator core; 211. Stator slot; 22. Stator winding; 2201. Lead-out wire of the first branch of phase A; 2202. Star point line of the first branch of phase A; 2203. Lead-out wire of the second branch of phase A; 2204. Star point line of the second branch of phase A; 2205. Lead-out wire of the first branch of phase B; 2206. Star point line of the first branch of phase B; 2207. Lead-out wire of the second branch of phase B; 2208. Star point line of the second branch of phase B; 2209. Lead-out wire of the first branch of phase C; 2210. Star point line of the first branch of phase C; 2211. Lead-out wire of the second branch of phase C; 2212. Star point line of the second branch of phase C; 23. Lead-out wire module. DETAILED DESCRIPTION

[0064] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0065] like Figures 1 to 6 As shown, a rotor punching sheet 1 provided by an embodiment of the utility model comprises a plurality of magnetic poles 11 arranged along the circumference of the rotor punching sheet 1, the magnetic poles 11 are fan-shaped, and the plurality of magnetic poles 11 are spliced ​​along the circumference to form a ring-shaped rotor punching sheet 1. The magnetic pole 11 is provided with a magnetic steel slot group 111, a first groove 112 and a slot hole 113, the magnetic pole 11 has a d-axis and a q-axis, the magnetic pole is symmetrical about the d-axis, and adjacent magnetic poles 11 are symmetrical about the q-axis. The magnetic steel slot group 111 is symmetrical about the d-axis, and the magnetic steel slot group 111 is used to insert magnetic steel.

[0066] The first groove 112 is disposed at the intersection of the outer edge of the magnetic pole 11 and the d-axis. The first groove 112 is located outside the magnetic steel slot group 111 in the radial direction of the rotor punching 1 , and the q-axis passes through the slot hole 113 .

[0067] The rotor punching 1 of the embodiment of the utility model can reduce the magnetic field force in the tangential direction and radial direction caused by the harmonic magnetic field through the combination of the first groove 112 on the d-axis and the slot hole 113 on the q-axis, obtain a lower air gap magnetic density and harmonic content, reduce the torque pulsation and radial force of the rotor punching 1, and achieve the purpose of reducing motor noise. The first groove 112 is set on the d-axis. Since the first groove 112 is concave toward the center of the rotor punching 1, there is no risk of bore sweeping, and it can be used even in small air gap motors. The slot hole 113 is set on the q-axis, which can reduce the magnetic field force in the radial direction caused by the harmonic magnetic field, and will not have a significant impact on the strength of the rotor punching 1, has good reliability, and meets high-speed requirements.

[0068] In one embodiment, if Figure 1 , Figure 2 As shown, the magnetic pole 11 has a first edge, a second edge, a third edge and a third edge, the first edge and the second edge are arcs extending along the circumference of the rotor punching 1, and the first edge is located outside the second edge in the radial direction of the rotor punching 1, that is, the first edge is the outer edge of the magnetic pole 11, the first groove 112 is arranged on the first edge, the d-axis coincides with the center line of the magnetic pole 11, and can pass through the midpoint of the first edge and the midpoint of the second edge.

[0069] After the plurality of magnetic poles 11 are circumferentially spliced ​​to form the rotor punching 1 , the plurality of first edges form the outer edge of the rotor punching 1 , and the plurality of second edges form the axial hole of the rotor punching 1 .

[0070] The third edge and the fourth edge both extend radially along the rotor punching 1 and are both connected between the first edge and the second edge. The third edge and the fourth edge are arranged opposite to each other in the circumferential direction of the rotor punching, the q axis coincides with the third edge, and the slot 113 is arranged at the third edge and the fourth edge.

[0071] In one embodiment, if Figure 2 , Figure 3 As shown, the first groove 112 includes a first auxiliary groove 1121 and a second auxiliary groove 1122, and the first auxiliary groove 1121 and the second auxiliary groove 1122 are arranged on the first edge 1131, and the first auxiliary groove 1121 is connected to the second auxiliary groove 1122, so that the first auxiliary groove 1121 and the second auxiliary groove 1122 can be processed together, simplifying the processing technology of the first groove 112. The magnitude of the torque fluctuation on the rotor punching 1 is mainly related to the air gap magnetic flux of the air gap. Therefore, the higher the sinusoidality of the air gap magnetic flux, the smaller the harmonic amplitude corresponding to the air gap magnetic flux. By arranging the first auxiliary groove 1121 and the second auxiliary groove 1122 on the outer edge of the rotor punching 1, the sinusoidality of the air gap magnetic flux is optimized and the harmonic content is reduced.

[0072] In some alternative embodiments, the first auxiliary groove 1121 and the second auxiliary groove 1122 may be spaced apart in the circumferential direction of the rotor sheet 1 .

[0073] In one embodiment, the first auxiliary groove 1121 and the second auxiliary groove 1122 are arc-shaped grooves, and the first auxiliary groove 1121 and the second auxiliary groove 1122 are symmetrically arranged about the d axis, so that the rotor punching 1 has good NVH performance when rotating clockwise or counterclockwise.

[0074] In one embodiment, if Figure 3 As shown, the first auxiliary groove 1121 and the second auxiliary groove 1122 have the same structure, and the length L of the first auxiliary groove 1121 in the circumferential direction of the rotor punching 1 is 11 The depth H of the first auxiliary groove 1121 in the radial direction of the rotor punching 1 is 0.1-1 mm. 11 The length L of the second auxiliary groove 1122 in the circumferential direction of the rotor punching 1 is 0.3 to 0.5 mm. 12 The depth H of the second auxiliary groove 1122 in the radial direction of the rotor punching 1 is 0.1-1 mm. 12 After the first auxiliary groove 1121 is connected to the second auxiliary groove 1122, the total length of the first groove 112 in the circumferential direction of the rotor punching 1 is L 11 With L 12 sum.

[0075] The first auxiliary groove 1121 and the second auxiliary groove 1122 are arranged at the d-axis, and the length and depth of the first auxiliary groove 1121 and the second auxiliary groove 1122 are limited within the above range, which has a better optimization effect on the magnetic field force of the harmonic magnetic field in the tangential direction.

[0076] In one embodiment, if Figure 3 As shown, the d axis passes through the intersection of the first auxiliary groove 1121 and the second auxiliary groove 1122, which is located radially inside the outer edge of the rotor punching 1. The depth H of the intersection in the radial direction of the rotor punching 1 is 13 (0.8~0.9)*H 11 , or, the radial dimension H of the intersection position in the rotor sheet 1 13 (0.8~0.9)*H 12 The first auxiliary groove 1121 and the second auxiliary groove 1122 are connected to form a W-shaped structure, and the depth of the deepest position of the W-shaped structure is H 11 and H 12 The intersection position is located between the outer edge of the rotor punching 1 and the deepest position.

[0077] In one embodiment, if Figure 1 , Figure 2As shown, two slots 113 are provided, and the magnetic pole 11 has two sides extending in the radial direction, which are the third edge and the fourth edge respectively, one of the slots 113 is provided on the third edge, and the other slot 113 is provided on the fourth edge. On the rotor punching 1, of the two adjacent magnetic poles 11, the third edge of one magnetic pole 11 and the fourth edge of the other magnetic pole 11 coincide, and the two slots 113 can enclose to form a through hole 10. On the radial plane of the rotor punching 1, the cross-sectional shape of the through hole 10 is a closed structure, and the q-axis passes through the center line of the through hole 10. The through hole 10 provided on the q-axis can reduce the magnetic field force in the radial direction brought by the harmonic magnetic field.

[0078] like Figure 2 , Figure 6 As shown, the structures of the two slots 113 are the same, and the slot 113 on the third edge is used as an example. The hole wall of the slot 113 includes a first edge 1131, a second edge 1132 and a transition portion 1133. The first edge 1131, the transition portion 1133 and the second edge 1132 are connected to define the slot 113. The first edge 1131 is arranged between the third edge and one end of the transition portion 1133, and the second edge 1132 is arranged between the third edge and the other end of the transition portion 1133. The end of the first edge 1131 away from the transition portion 1133 and the end of the second edge 1132 away from the transition portion 1133 are spaced apart on the third edge to form an opening of the slot 113. Among two adjacent magnetic poles 11, the first edge 1131 of the slot 113 of one magnetic pole 11 is connected to the first edge 1131 of the slot 113 of the other magnetic pole 11, and the second edge 1132 of the slot 113 of one magnetic pole 11 is connected to the second edge 1132 of the slot 113 of the other magnetic pole 11, thereby forming a through hole 10 with a closed structure.

[0079] In one embodiment, the distance L between the first edge 1131 and the outer edge of the rotor punching 1 on the q axis is 01 The diameter of the slot 113 is 0.8-1 mm, so that the slot 113 is located inside the outer edge of the rotor punching 1, which can avoid tearing of the rotor punching 1 under high-speed rotation.

[0080] like Figure 6 As shown, the distance H0 between the first edge 1131 and the second edge 1132 on the q-axis is 0.6-1.2 mm, and the distance L between the transition portion 1133 and the q-axis is 02 For L min *(0.5~0.8), L 02 is the length of the slot 113 in the direction perpendicular to the q axis, where L min is the minimum distance between the magnetic steel slot group 111 and the q-axis. Draw an auxiliary line parallel to the q-axis on the side of the magnetic steel slot group 111 close to the q-axis, and the distance between the auxiliary line and the q-axis is Lmin In this embodiment, by limiting the slot hole 113 within the above range, the slot hole 113 has a better regulating effect on the radial force and magnetic field.

[0081] Accordingly, on the rotor punching sheet 1, the through hole 10 is formed by two slots 113, and the length of the through hole 10 in the direction perpendicular to the q-axis is 2*L 02 .

[0082] In one embodiment, if Figure 6 As shown, the first edge 1131 is perpendicular to the q-axis, so that after the two slots 113 are spliced ​​together, the through hole 10 is roughly triangular, and the first edges 1131 of the two adjacent magnetic poles 11 are colinear to form the base of the triangle and are perpendicular to the q-axis. The triangular through hole has the effect of reducing stress concentration, meeting the height requirements, and better regulating the radial force and magnetic field.

[0083] The second edge 1132 includes a first straight line segment 11321 and a first arc segment 11322, one end of the first arc segment 11322 is located on the third edge, the first straight line segment 11321 is connected between the other end of the first arc segment 11322 and the transition portion 1133, and the first straight line segment 11321 and the first edge 1131 form an acute angle. The second edges 1132 of two adjacent magnetic poles 11 are symmetrically arranged to form two hypotenuses of the triangular through hole, and the first arc segments 11322 of the two second edges 1132 are connected together, so that the vertex of the triangular through hole 10 is smooth, which can reduce the stress concentration of the through hole 10.

[0084] The transition portion 1133 is arc-shaped, and the transition portion 1133 allows a smooth connection between the first edge 1131 and the second edge 1132 , which has the effect of reducing stress concentration of the through hole 10 , meets the high-speed requirements of the rotor punching 1 , and has good reliability.

[0085] Among them, in the through hole 10, the distance H0 between the first edge 1131 and the second edge 1132 on the q axis remains unchanged, and the two first edges 1131 are collinear, so the distance between the through hole 10 and the outer edge of the rotor punching 1 on the q axis is equal to L 01 .

[0086] In one embodiment, if Figure 1 , Figure 2As shown, the outer edge of the magnetic pole 11 is provided with a second groove 114, the magnetic steel groove group 111 includes two first magnetic steel grooves 1111 provided on the same magnetic pole 11, the two first magnetic steel grooves 1111 provided on the same magnetic pole 11 are symmetrically arranged about the d axis, a magnetic isolation bridge is formed between one end of each first magnetic steel groove 1111 and the outer edge of the magnetic pole 11, and the outer edge of the magnetic pole 11 corresponding to each magnetic isolation bridge is respectively provided with a second groove 114. By arranging the second groove 114 on the magnetic isolation bridge, the effect of harmonic suppression is achieved, and the magnetic field force in the tangential direction at the magnetic isolation bridge can be reduced.

[0087] Among them, a plurality of magnetic steel slot groups 111 are arranged at intervals along the circumferential direction on the rotor punching 1, and the two first magnetic steel slots 1111 form a V-shaped structure opening outward.

[0088] In one embodiment, two second grooves 114 are provided on each magnetic pole 11. On the same magnetic pole 11, the two second grooves 114 are symmetrically arranged about the d-axis. By symmetrically arranging the second grooves 114 on both sides of the d-axis, the magnetic field force in the tangential direction at the two magnetic bridges is reduced, so that the rotor punching 1 has better NVH performance when rotating clockwise or counterclockwise.

[0089] In one embodiment, if Figure 6 As shown, the length L2 of the second groove 114 in the circumferential direction of the rotor punching 1 is 1 to 3 mm, and the depth H2 of the second groove 114 in the radial direction of the rotor punching 1 is 0.3 to 0.5 mm.

[0090] The size of the second groove 114 is limited within the above range, so that the second groove 114 has a better harmonic suppression effect.

[0091] In one embodiment, the second groove 114 is an arc-shaped groove.

[0092] In one embodiment, if Figure 1 As shown, the magnetic steel slot group 111 also includes two second magnetic steel slots 1112 arranged on the same magnetic pole 11, and the two second magnetic steel slots 1112 are symmetrically arranged about the d axis, and the first magnetic steel slot 1111 is located on the inner side of the second magnetic steel slot 1112 in the radial direction of the magnetic pole 11. A third groove 115 and a fourth groove 116 are arranged on the outer edge of the magnetic pole 11, and a third groove 115 is arranged between one end of each second magnetic steel slot 1112 close to the outer edge of the magnetic pole 11 and the first groove 112, and a fourth groove 116 is arranged between one end of each second magnetic steel slot 1112 close to the outer edge of the magnetic pole 11 and the second groove 114. Through the coordinated use of the first groove 112, the second groove 114, the third groove 115 and the fourth groove 116 harmonic grooves, the torque fluctuation of the rotor punching 1 and the tangential force magnetic field have a better regulation effect, and the noise reduction effect is also more obvious.

[0093] In one embodiment, if Figure 1 , Figure 2 As shown, two third grooves 115 and two fourth grooves 116 are arranged on each magnetic pole 11, and the two third grooves 115 are arranged symmetrically about the d axis, and the two fourth grooves 116 are arranged symmetrically about the d axis, so that the rotor punching 1 has good NVH performance when rotating clockwise or counterclockwise. And through the symmetrical arrangement, four groups of auxiliary grooves are formed on the outer edge of the rotor punching 1, which can optimize the sinusoidality of the air gap magnetic density and reduce the harmonic amplitude.

[0094] In one embodiment, if Figure 4 As shown, the length L3 of the third groove 115 in the circumferential direction of the rotor punching 1 is 1-3 mm, and the depth H3 of the third groove 115 in the radial direction of the rotor punching 1 is 0.3-0.5 mm.

[0095] A length L4 of the fourth groove 116 in the circumferential direction of the rotor punching 1 is 1 to 3 mm, and a depth H4 of the fourth groove 116 in the radial direction of the rotor punching 1 is 0.3 to 0.5 mm.

[0096] The third groove 115 and the fourth groove 116 are limited within the above range. By combining four groups of auxiliary grooves of different sizes, a better pole arc coefficient can be obtained on the rotor punching 1, and the harmonics of the air gap magnetic density can be reduced, thereby reducing the tangential force and torque fluctuation on the rotor punching 1, thereby achieving the purpose of reducing motor noise.

[0097] In one embodiment, the groove wall of the third groove 115 and the groove wall of the fourth groove 116 both include a second straight line segment and / or a second arc segment, that is, the third groove 115 and the fourth groove 116 can be an arc groove formed by a second arc segment, or a V-shaped groove formed by two second straight line segments, or formed by a second straight line segment and a second arc segment.

[0098] In a preferred embodiment, in order to optimize the air gap magnetic field and take stress into consideration, the third groove 115 and the fourth groove 116 both include a second straight line segment and a second arc segment, the first end of the second straight line segment is connected to the first end of the second arc segment, the second end of the second straight line segment is connected to the outer edge of the rotor punching 1, the second end of the second arc segment is connected to the outer edge of the rotor punching 1, the second end of the second straight line segment and the second end of the second arc segment are spaced apart in the circumferential direction of the rotor punching 1, and through the combination of straight lines and arcs, the third groove 115 and the fourth groove 116 can form an asymmetrically designed groove, which is more flexible and facilitates obtaining the optimal air gap magnetic field effect.

[0099] On the other hand, an embodiment of the present invention provides a rotor, comprising a plurality of rotor punchings 1 according to the above embodiments, wherein the plurality of rotor punchings 1 are stacked along the axial direction thereof.

[0100] On the other hand, Figures 7 to 11 As shown, an embodiment of the utility model provides a motor, including a stator 2 and the rotor of the above embodiment.

[0101] Preferably, a combination of a short-pitch stator 2 and a straight-pole rotor is used, in which the stator 2 has small harmonics, a better NVH effect, a good noise reduction effect, no axial magnetic leakage, high magnetic steel utilization, and a simple rotor oil circuit design.

[0102] In one embodiment, if Figure 7 , Figure 8 As shown, the stator 2 includes a stator core 21, a stator winding 22 and a lead-out module 23. The stator winding 22 is arranged on the stator core 21, and the lead-out module 23 is arranged at one axial end of the stator core 21. The stator winding 22 includes an A-phase winding, a B-phase winding and a C-phase winding. Each phase winding includes a first branch and a second branch connected in parallel. Both ends of the first branch and the second branch have lead-out wires and star point lines. The lead-out wires of the first branch and the second branch are connected to the lead-out module 23. The star point lines of the first branches of different phase windings are connected to each other, and the star point lines of the second branches of different phase windings are connected to each other.

[0103] Specifically, the first branch of the A-phase winding has an A-phase first branch lead-out line 2201 and an A-phase first branch star point line 2202, and the second branch of the A-phase winding has an A-phase second branch lead-out line 2203 and an A-phase second branch star point line 2204. The first branch of the B-phase winding has a B-phase first branch lead-out line 2205 and a B-phase first branch star point line 2206, and the second branch of the B-phase winding has a B-phase second branch lead-out line 2207 and a B-phase second branch star point line 2208. The first branch of the C-phase winding has a C-phase first branch lead-out line 2209 and a C-phase first branch star point line 2210, and the second branch of the C-phase winding has a C-phase second branch lead-out line 2211 and a C-phase second branch star point line 2212.

[0104] A phase first branch lead-out line 2201, A phase second branch lead-out line 2203, B phase first branch lead-out line 2205, B phase second branch lead-out line 2207, C phase first branch lead-out line 2209 and C phase second branch lead-out line 2211 are all connected to the lead-out line module 23, and connected to external electrical devices through the lead-out line module 23.

[0105] The A phase first branch star point line 2202, the B phase first branch star point line 2206 and the C phase first branch star point line 2210 are connected to each other, and the A phase second branch star point line 2204, the B phase second branch star point line 2208 and the C phase second branch star point line 2212 are connected to each other.

[0106] In one embodiment, if Figure 8As shown, the stator core 21 is provided with M stator slots 211 spaced along the circumferential direction thereof, the stator winding 22 is wound in the M stator slots 211, and each stator slot 211 has N slot layers arranged along the radial direction of the stator core 21; wherein M is a multiple of 3 and an even number, and N ≥ 4. In the radial direction of the stator core 21, the slot layer corresponding to the star point line is located on the inner side of the slot layer corresponding to the lead wire, so as to facilitate the connection between the lead wire and the lead wire module 23.

[0107] In one embodiment, M is 72, N is 6, and each stator slot 211 has 6 layers of conductors, and the conductors are arranged in the form of asymmetric short-distance windings in the slots of 2, 4, 6, 4, and 2, that is, the A-phase winding is sequentially arranged in 5 consecutive stator slots 211 with 2, 4, 6, 4, and 2 conductors, and 6 A-phase conductors are arranged in the middle stator slot 211. Among the two stator slots 211 with 4 A-phase conductors, one of them also has 2 B-phase conductors, and the other also has 2 C-phase conductors, and the A-phase conductors in the two stator slots 211 are asymmetric. Among the stator slots 211 with 2 A-phase conductors, one of them also has 4 B-phase conductors, and the other also has 4 C-phase conductors, and the A-phase conductors in the two stator slots 211 are asymmetric.

[0108] Compared with the short-distance method of symmetrical conductors in the slot, this embodiment can better eliminate the 5th and 7th harmonics in the magnetic field in electromagnetic theory, and can eliminate more than 80% of the 5th and 7th harmonics, and the 24th order vibration noise is very small.

[0109] Since there are conductors of different phases (such as A and B phases or A and C phases) in the stator slots 211, the voltage gradient between the conductors is relatively high, so B-type insulating paper is generally used in the stator slots 211 to separate the two-phase conductors to ensure insulation strength and reliability.

[0110] In one embodiment, the 72 stator slots 211 are numbered 1-72 in sequence, and the 6 slot layers are numbered af in sequence from the radial inner side to the radial outer side of the stator core 21, indicating the first to sixth layers in the same stator slot 211, the a layer is located at the slot opening of the stator slot 211, and the f layer is located at the slot bottom of the stator slot 211. 1f represents the sixth layer of the first stator slot 211, 46e represents the fifth layer of the 46th stator slot 211, and the rest are analogous.

[0111] like Fig. 9 As shown, the connection method of the first branch of the A-phase winding is:

[0112] 1f->11f->20e->28d->37c->45b->54a->63a->54b->46c->37d->29e->20f->30f->39e->47d->56c->64b->1a->10a-> 1b->65c->56d->48e->39f->46f->55e->63d->72c->8b->17a->26a->17b->9c->72d->64e->55f->65f->2e->10d->19 c->27b->36a->45a->36b->28c->19d->11e>2f->12f->21e->29d->38c->46b->55a->64a->55b->47c->38d->30e->21f->28f->37e->45d->54c->62b->71a->8a->71b->63c->54d->46e; wherein 1f is connected to the A phase first branch lead-out line 2201, and 46e is connected to the A phase first branch star point line 2202.

[0113] The connection method of the second branch of the A phase winding is:

[0114] 37f->47f->56e->64d->1c->9b->18a->27a->18b->10c->1d->65e->56f->66f->3e->11d->20c->28b->37a->46a->37b->29c ->20d->12e->3f->10f->19e->27d->36c->44b->53a->62a->53b->45c->36d->28e->19f->29f->38e->46d->55c->63b->72a- >9a->72b->64c->55d->47e->38f->48f->57e->65d->2c->10b->19a->28a->19b->11c->2d->66e->57f->64f->1e->9d->18c->26b->35a->44a->35b->27c->18d->10e; wherein 37f is connected to the A-phase second branch lead-out line 2203, 1f is connected to 37f through a copper busbar, the copper busbar is connected to the lead-out line module 23, and 10e is connected to the A-phase second branch star point line 2204.

[0115] The A-phase first branch lead wire 2201 and the A-phase second branch lead wire 2203 are both distributed in the sixth layer of the stator slot 211, and the A-phase first branch star point line 2202 and the A-phase second branch star point line 2204 are both distributed in the fifth layer of the stator slot 211. In the axial direction of the stator core 21, there are 36 stator slots 211 between 1f connected to the A-phase first branch lead wire 2201 and 37f connected to the A-phase second branch lead wire 2203, and there are 36 stator slots 211 between 46e connected to the A-phase first branch star point line 2202 and 10e connected to the A-phase second branch star point line 2204.

[0116] In one embodiment, the A-phase first branch lead wire 2201 and the B-phase first branch lead wire 2205 differ by 6 stator slots 211 in the circumferential direction of the stator core 21, and the A-phase first branch star point line 2202 and the B-phase first branch star point line 2206 differ by 6 stator slots 211 in the circumferential direction of the stator core 21. The A-phase second branch lead wire 2203 and the B-phase second branch lead wire 2207 differ by 6 stator slots 211 in the circumferential direction of the stator core 21, and the A-phase second branch star point line 2204 and the B-phase second branch star point line 2208 differ by 6 stator slots 211 in the circumferential direction of the stator core 21.

[0117] like Fig.10 As shown, the connection method of the first branch of the B-phase winding is:

[0118] 7f->17f->26e->34d->43c->51b->60a->69a->60b->52c->43d->35e->26f->36f->45e->53d->62c->70b->7a->16a- >7b->71c->62d->54e->45f->52f->61e->69d->6c->14b->23a->36a->23b->15c->6d->70e->61f->71f->8e->16d->2 5c->33b->42a->51a->42b->34c->25d->17e>8f->20f->27e->35d->44c->52b->61a->70a->61b->53c->44d->36e->27f->34f->43e->51d->60c->68b->5a->14a->5b->69c->60d->52e; wherein 7f is connected to the B phase first branch lead-out line 2205, and 52e is connected to the B phase first branch star point line 2206.

[0119] The connection method of the second branch of the B phase winding is:

[0120] 43f->53f->62e->70d->7c->15b->24a->33a->24b->16c->7d->71e->62f->72f->9e->17d->26c->34b->43a->52a->43b->35 c->26d->18e->9f->16f->25e->33d->42c->50b->59a->68a->59b->51c->42d->34e->25f->35f->44e->52d->61c->69b->6a- >15a->6b->70c->61d->53e->44f->54f->63e->71d->8c->16b->25a->33a->25b->17c->8d->72e->63f->70f->7e->15d->24c->32b->41a->50a->41b->33c->24d->16e; wherein 43f is connected to the B-phase second branch lead-out line 2207, 7f is connected to 43f through a copper busbar, the copper busbar is connected to the lead-out line module 23, and 16e is connected to the B-phase second branch star point line 2208.

[0121] In one embodiment, the first branch lead-out line of phase B and the first branch lead-out line 2209 of phase C differ by 6 stator slots 211 in the circumferential direction of the stator core 21, the first branch star point line 2206 of phase B and the first branch star point line 2210 of phase C differ by 6 stator slots 211 in the circumferential direction of the stator core 21, the second branch lead-out line 2207 of phase B and the second branch lead-out line 2211 of phase C differ by 6 stator slots 211 in the circumferential direction of the stator core 21, and the second branch star point line 2208 of phase B and the second branch star point line 2212 of phase C differ by 6 stator slots 211 in the circumferential direction of the stator core 21.

[0122] like Fig.11 As shown, the connection mode of the first branch of the C-phase winding is:

[0123] 13f->23f->32e->40d->49c->57b->66a->3a->66b->58c->49d->41e->32f->42f->51e->59d->68c->4b->13a->22a-> 13b->5c->68d->60e->51f->58f->67e->3d->13c->20b->29a->42a->29b->21c->12d->4e->67f->5f->14e->22d->31 c->39b->48a->57a->48b->40c->31d->23e>14f->26f->33e->41d->50c->58b->67a->4a->67b->59c->50d->42e->33f->40f->49e->57d->66c->2b->11a->20a->11b->3c->66d->58e; among which 13f is connected to the C phase first branch lead-out line 2209, and 58e is connected to the C phase first branch star point line 2210.

[0124] The connection method of the second branch of the C phase winding is:

[0125] 49f->59f->68e->4d->13c->21b->30a->39a->30b->22c->13d->5e->68f->6f->15e->23d->32c->40b->49a->58a->49b->41 c->32d->24->15f->21f->31e->39d->48c->56b->65a->2a->65b->57c->48d->40e->31f->41f->50e->58d->67c->3b->12a-> 21a->12b->4c->67d->59e->50f->60f->69e->5d->14c->20b->31a->39a->31b->23c->14d->6e->69f->4f->13e->2d->30c->38b->47a->56a->47b->39c->30d->22e; wherein 49f is connected to the C phase second branch lead-out line 2211, 13f and 49f are connected through a copper busbar, the copper busbar is connected to the lead-out line module 23, and 22e is connected to the C phase second branch star point line 2212.

[0126] On the other hand, an embodiment of the present invention provides a power assembly, including the motor of the above embodiment.

[0127] On the other hand, an embodiment of the present invention provides a vehicle, comprising the powertrain of the above embodiment or the motor of the above embodiment.

[0128] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotor punching, characterized in that: The invention comprises a plurality of magnetic poles arranged along the circumferential direction of the rotor punching sheet, wherein the magnetic poles are provided with a magnetic steel slot group, a first groove and a slot hole, the magnetic poles have a d-axis and a q-axis extending in the radial direction, the magnetic poles are symmetrical about the d-axis, and adjacent magnetic poles are symmetrical about the q-axis; The first groove is arranged at the intersection of the outer edge of the magnetic pole and the d-axis, and the first groove is located outside the magnetic steel slot group in the radial direction of the rotor punching sheet, and the q-axis passes through the slot hole.

2. The rotor punching according to claim 1, characterized in that: The first groove includes a first auxiliary groove and a second auxiliary groove, and the first auxiliary groove is connected to the second auxiliary groove.

3. The rotor punching according to claim 2, characterized in that: The first auxiliary groove and the second auxiliary groove are both arc-shaped grooves; The first auxiliary groove and the second auxiliary groove are symmetrically arranged about the d-axis.

4. The rotor punching according to claim 2, characterized in that: The length L of the first auxiliary groove in the circumferential direction of the rotor punching sheet 11 The depth H of the first auxiliary groove in the radial direction of the rotor punching is 0.1-1 mm. 11 It is 0.3~0.5mm.

5. The rotor punching sheet according to claim 2, characterized in that: The length L of the second auxiliary groove in the circumferential direction of the rotor punching sheet is 12 The depth H of the second auxiliary groove in the radial direction of the rotor punching is 0.1-1 mm. 12 It is 0.3~0.5mm.

6. The rotor punching according to claim 4, characterized in that: The d-axis passes through the intersection of the first auxiliary groove and the second auxiliary groove, and the depth H of the intersection in the radial direction of the rotor punching is 13 (0.8~0.9)*H 11 .

7. The rotor punching according to claim 1, characterized in that: There are two slots, and the magnetic pole has two side edges extending in the radial direction. A slot is correspondingly arranged on each side edge, so that the slots of two adjacent magnetic poles are surrounded to form a through hole.

8. The rotor punching according to claim 7, characterized in that: The hole wall of the slot hole comprises a first edge, a second edge and a transition portion, wherein the first edge is arranged between the side edge and one end of the transition portion, and the second edge is arranged between the side edge and the other end of the transition portion.

9. The rotor punching according to claim 8, characterized in that: The distance L between the first edge and the outer edge of the rotor punch on the q axis 01 is 0.8-1 mm, the distance H0 between the first edge and the second edge on the q-axis is 0.6-1.2 mm, and the distance L between the transition portion and the q-axis is 02 For L min *(0.5~0.8); Among them, L min is the minimum distance between the magnetic steel slot group and the q-axis.

10. The rotor punching according to claim 8, characterized in that: The first edge is perpendicular to the side edge.

11. The rotor punching according to claim 10, characterized in that: The second edge includes a first straight line segment and a first arc segment, one end of the first arc segment is located on the side, the first straight line segment is connected between the other end of the first arc segment and the transition portion, and the first straight line segment and the first edge form an acute angle.

12. The rotor punching according to claim 8, characterized in that: The transition portion is arc-shaped.

13. The rotor punching according to claim 1, characterized in that: The magnetic steel slot group includes two first magnetic steel slots arranged on the same magnetic pole, and the two first magnetic steel slots arranged on the same magnetic pole are symmetrically arranged about the d axis. A magnetic isolation bridge is formed between one end of each of the first magnetic steel slots and the outer edge of the magnetic pole, and a second groove is respectively opened on the outer edge of the magnetic pole corresponding to each of the magnetic isolation bridges.

14. The rotor punching according to claim 13, characterized in that: On the same magnetic pole, two second grooves are symmetrically arranged about the d-axis.

15. The rotor punching according to claim 13, characterized in that: A length L2 of the second groove in the circumferential direction of the rotor punching sheet is 1 to 3 mm, and a depth H2 of the second groove in the radial direction of the rotor punching sheet is 0.3 to 0.5 mm.

16. The rotor punching according to claim 13, characterized in that: The second groove is an arc-shaped groove.

17. The rotor punching according to claim 13, characterized in that: The magnetic steel slot group further includes two second magnetic steel slots arranged on the same magnetic pole, the two second magnetic steel slots are symmetrically arranged about the d axis, and the first magnetic steel slot is located on the inner side of the second magnetic steel slot in the radial direction of the magnetic pole; A third groove is respectively arranged between one end of each second magnetic steel groove close to the outer edge of the magnetic pole and the first groove; a fourth groove is respectively arranged between one end of each second magnetic steel groove close to the outer edge of the magnetic pole and the second groove.

18. The rotor punching according to claim 17, characterized in that: A length L3 of the third groove in the circumferential direction of the rotor punch is 1 to 3 mm, and a depth H3 of the third groove in the radial direction of the rotor punch is 0.3 to 0.5 mm.

19. The rotor punching according to claim 17, characterized in that: A length L4 of the fourth groove in the circumferential direction of the rotor punch is 1 to 3 mm, and a depth H4 of the fourth groove in the radial direction of the rotor punch is 0.3 to 0.5 mm.

20. A rotor, characterized in that: The invention comprises a plurality of rotor punching sheets according to any one of claims 1 to 19, wherein the plurality of rotor punching sheets are stacked along the axial direction thereof.

21. A motor, characterized in that: It comprises a stator and the rotor as claimed in claim 20.

22. The electric machine according to claim 21, characterized in that The stator comprises a stator core, a stator winding and a lead wire module, wherein the stator winding is arranged on the stator core, and the lead wire module is arranged at one axial end of the stator core; The stator winding includes an A-phase winding, a B-phase winding and a C-phase winding; each phase of the winding includes a first branch and a second branch connected in parallel, both ends of the first branch and the second branch have lead wires and a star point line, and the lead wires of the first branch and the second branch are connected to the lead wire module; The star point lines of the first branches of the different phase windings are connected to each other, and the star point lines of the second branches of the different phase windings are connected to each other.

23. The electric machine according to claim 22, characterized in that The stator core is provided with M stator slots spaced along the circumferential direction thereof, the stator winding is wound in the M stator slots, and each of the stator slots has N slot layers arranged along the radial direction of the stator core; wherein M is a multiple of 3 and an even number, and N≥4; In the radial direction of the stator core, the slot layer corresponding to the star point line is located on the inner side of the slot layer corresponding to the lead wire.

24. The electric machine according to claim 23, characterized in that M is 72, N is 6; The 72 stator slots are numbered 1-72 in sequence, and the 6 slot layers are numbered af in sequence from the radial inner side to the radial outer side of the stator core; The connection mode of the first branch of the A-phase winding is: 1f->11f->20e->28d->37c->45b->54a->63a->54b->46c->37d->29e->20f->30f->39e->47d->56c->64b->1a->10a-> 1b->65c->56d->48e->39f->46f->55e->63d->72c->8b->17a->26a->17b->9c->72d->64e->55f->65f->2e->10d->19c ->27b->36a->45a->36b->28c->19d->11e>2f->12f->21e->29d->38c->46b->55a->64a->55b->47c->38d->30e->21f->28f->37e->45d->54c->62b->71a->8a->71b->63c->54d->46e; wherein 1f is connected to the first branch lead-out line of the A-phase winding, and 46e is connected to the first branch star point line of the A-phase winding; The connection mode of the second branch of the A-phase winding is: 37f->47f->56e->64d->1c->9b->18a->27a->18b->10c->1d->65e->56f->66f->3e->11d->20c->28b->37a->46a->37 b->29c->20d->12e->3f->10f->19e->27d->36c->44b->53a->62a->53b->45c->36d->28e->19f->29f->38e->46d->55 c->63b->72a->9a->72b->64c->55d->47e->38f->48f->57e->65d->2c->10b->19a->28a->19b->11c->2d->66e->57f->64f->1e->9d->18c->26b->35a->44a->35b->27c->18d->10e; wherein 37f is connected to the second branch lead-out line of the A-phase winding, and 10e is connected to the second branch star point line of the A-phase winding.

25. The electric machine according to claim 24, characterized in that The first branch lead wire of the A-phase winding differs from the first branch lead wire of the B-phase winding by 6 stator slots in the circumferential direction of the stator core, and the first branch lead wire of the B-phase winding differs from the first branch lead wire of the C-phase winding by 6 stator slots in the circumferential direction of the stator core; The first branch star point line of the A-phase winding differs from the first branch star point line of the B-phase winding by 6 stator slots in the circumferential direction of the stator core, and the first branch star point line of the B-phase winding differs from the first branch star point line of the C-phase winding by 6 stator slots in the circumferential direction of the stator core; The second branch lead wire of the A-phase winding differs from the second branch lead wire of the B-phase winding by 6 stator slots in the circumferential direction of the stator core, and the second branch lead wire of the B-phase winding differs from the second branch lead wire of the C-phase winding by 6 stator slots in the circumferential direction of the stator core; The second branch star point line of the A-phase winding differs from the second branch star point line of the B-phase winding by 6 stator slots in the circumferential direction of the stator core, and the second branch star point line of the B-phase winding differs from the second branch star point line of the C-phase winding by 6 stator slots in the circumferential direction of the stator core.

26. A powertrain, characterized in that: A motor comprising any one of claims 21-25.

27. A vehicle, characterized in that: Comprising the powertrain of claim 26 or the motor of any one of claims 21-25.

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