CN210608720U - Motor stator and motor - Google Patents

Abstract

The utility model provides a motor stator and motor, this motor stator include stator core, still include: the stator winding comprises a first coil unit and a second coil unit which are sequentially distributed along the radial direction of a stator core, each coil unit comprises a plurality of conductors, and each conductor comprises two slot interiors which are used for being inserted into different slots; dividing each slot into M layers according to the number of the slots inside each slot can accommodate along the radial direction of the stator core, wherein M is an integer more than or equal to 3; the two grooves of each conductor in the first coil unit are positioned on the same layer, and the pitch of the first coil unit is smaller than the pole pitch of the stator winding; the two slots of each conductor in the second coil unit are positioned in two adjacent layers, and the pitch of the second coil unit is larger than or smaller than the pole pitch of the stator winding. Through the technical scheme of this application, can simplify the connection between the outer tip of a plurality of slots in each looks of motor stator winding, simplify processing technology, reduction in production cost improves production efficiency.

Description

Motor stator and motor

Technical Field

The utility model relates to the technical field of motors, particularly, relate to a motor stator and motor.

Background

In the construction process of a stator winding of the motor, the outer end parts of all slots in the A phase, the B phase and the C phase are connected by adopting the bus bars and the bus bars, the insulativity of the bus bars and the bus bars is continuously improved, but the bus bars and the bus bars bring process complexity in the manufacturing process of the stator winding of the motor, the production cost is increased, and the production efficiency is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a motor stator and motor can simplify the connection between the outer tip of a plurality of grooves in each looks of motor stator winding, simplifies processing technology, and reduction in production cost improves production efficiency.

According to an aspect of the present invention, there is provided a motor stator, comprising a stator core, wherein the stator core is provided with a plurality of slots axially arranged in a penetrating manner, and the slots are distributed along the circumferential direction of the stator core; further comprising: the stator winding comprises a first coil unit and a second coil unit which are sequentially distributed along the radial direction of a stator core, each coil unit comprises a plurality of conductors, and each conductor comprises two slot interiors which are used for being inserted into different slots; dividing each slot into M layers according to the number of the slots inside each slot can accommodate along the radial direction of the stator core, wherein M is an integer more than or equal to 3; the two grooves of each conductor in the first coil unit are positioned on the same layer, and the pitch of the first coil unit is smaller than the pole pitch of the stator winding; the two slots of each conductor in the second coil unit are positioned in two adjacent layers, and the pitch of the second coil unit is larger than or smaller than the pole pitch of the stator winding.

Furthermore, each coil unit comprises a plurality of windings, at least two conductors which are adjacently arranged form a group of phase conductors, each winding comprises three groups of phase conductors, and the two inner parts of each conductor are respectively the inner part of a wire inlet groove and the inner part of a wire outlet groove; each conductor also comprises an outside-groove turning part which is connected inside the two grooves and forms a U-shaped structure with the inside of the two grooves, and outer end parts of the grooves which are respectively connected inside the two grooves; each slot outer end extends substantially circumferentially of the stator core.

Further, the pitch inside the two slots of each conductor in the second coil unit is larger than the pole pitch of the stator winding; when M is an even number, the pitch of the outer end parts of the two slots welded by the conductors is smaller than the pole pitch of the stator winding; when M is an odd number, the pitch of the outer end parts of the two slots welded by the partial conductors is smaller than the pole pitch of the stator winding.

Further, the pitch inside the two slots of each conductor in the second coil unit is smaller than the pole pitch of the stator winding; when M is an even number, the pitch of the outer end parts of the two slots welded by the conductors is larger than the pole pitch of the stator winding; when M is an odd number, the pitch of the outer end parts of the two slots welded by the partial conductors is larger than the pole pitch of the stator winding.

Furthermore, in each group of phase conductors of the first coil unit, the distribution direction of the inside of the wire inlet groove and the inside of the wire outlet groove of each conductor along the circumferential direction of the stator core is opposite to the distribution direction of the inside of the wire inlet groove and the inside of the wire outlet groove of the adjacent conductor along the circumferential direction of the stator core; in each phase conductor of the second coil unit, the distribution directions of the inside of a wire inlet groove and the inside of a wire outlet groove of each conductor along the circumferential direction of the stator core are the same.

Further, the outer ends of the slots on the same layer are distributed in the same direction along the circumferential direction of the stator core, and the outer ends of the slots on two adjacent layers are distributed in the opposite direction along the circumferential direction of the stator core.

Further, the motor stator further comprises a third coil unit, wherein the third coil unit is positioned on one side of the second coil unit, which is far away from the first coil unit; when M is an odd number, the two inner grooves of each conductor in the third coil unit are positioned in two adjacent layers, and the pitch of the third coil unit is larger than or smaller than the pole pitch of the stator winding; and when M is an even number, the two inner grooves of each conductor in the third coil unit are positioned in the same layer, and the pitch of the third coil unit is equal to the pole pitch of the stator winding.

Furthermore, the outer ends of the two slots of each conductor are respectively the outer end of a wire inlet slot and the outer end of a wire outlet slot; for the conductors in the same phase, a plurality of conductors are sequentially connected, the outer end part of a wire outlet groove of one conductor in two conductors adjacent to each other in the connection direction is welded with the outer end part of a wire inlet groove of the other conductor, the outer end part of the wire outlet groove of one conductor is a neutral point of the phase, the outer end part of the wire outlet groove of the conductor is positioned in the same radial direction, the outer end part of the wire inlet groove of the other conductor adjacent to the outer end part of the wire outlet groove of the conductor is connected with a phase terminal, and the outer end parts of the other grooves are welded with the outer end part of the groove of the other conductor which is positioned in the same radial direction, is adjacent.

According to another aspect of the present invention, there is provided a motor, including the above-mentioned motor stator.

Use the technical scheme of the utility model, set up to be less than stator winding polar distance through the pitch with first coil unit, set up second coil unit pitch to be greater than stator winding polar distance or be less than stator winding polar distance. Therefore, the outer end parts of the slots can be directly connected in a welding mode, the use of a bus bar is omitted, the simplification of the winding process of the stator winding is realized, the application range is expanded, the production efficiency is further improved, and the production cost is reduced.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of a motor stator according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a stator core according to a first embodiment of the present invention;

FIG. 3 is a bottom view of FIG. 1;

fig. 4 is a schematic structural diagram of a stator winding according to a first embodiment of the present invention;

fig. 5 is a schematic structural diagram of the inner coil unit according to the first embodiment of the present invention;

fig. 6 is a schematic structural diagram of a first conductor forming a11 in the inner coil forming unit according to the first embodiment of the present invention;

fig. 7 is a diagram illustrating a positional relationship between a single group of phase-a conductors forming the inner coil unit and the stator core according to the first embodiment of the present invention;

fig. 8 is a schematic structural diagram of the middle coil unit according to the first embodiment of the present invention;

fig. 9 is a schematic structural diagram of a second conductor forming an intermediate coil unit according to a first embodiment of the present invention;

fig. 10 is a diagram of the positional relationship between a single group of phase-a conductors forming a middle coil unit and a stator core according to a first embodiment of the present invention;

fig. 11 is a schematic structural diagram of the outer coil unit according to the first embodiment of the present invention;

fig. 12 is a schematic structural diagram of a third conductor forming an outer coil unit according to a first embodiment of the present invention;

fig. 13 is a diagram showing the positional relationship between one type of winding forming the outer coil unit and the stator core according to the first embodiment of the present invention;

fig. 14 is a diagram showing the positional relationship between another type of winding forming the outer coil unit and the stator core according to the first embodiment of the present invention;

fig. 15 is a diagram of the position relationship of all the a-phase conductors in the first embodiment of the present invention;

fig. 16 is a schematic structural diagram of a stator winding according to a second embodiment of the present invention;

fig. 17 is a schematic structural diagram of an outer coil unit according to a second embodiment of the present invention;

fig. 18 is a diagram showing a positional relationship between all the a-phase conductors in the outer coil unit according to the second embodiment of the present invention;

fig. 19 is a diagram showing the positional relationship of all the a-phase conductors according to the second embodiment of the present invention;

fig. 20 is a schematic structural diagram of a stator winding of an odd-numbered layer motor in the third embodiment of the present invention.

Wherein the figures include the following reference numerals:

1. a stator core; 11. a tooth portion;

2. a stator winding; 21. an inner coil unit; 211. the inside of the wire inlet groove; 212. inside the wire outlet groove; 213. the outer end of the groove; 214. an out-of-groove turning part; 2141. a first extension portion; 2142. a turning part; 2143. a second extension portion; 2144. a corner portion;

22. an intermediate coil unit; 23. an outer coil unit;

311. a first groove; 312. a second groove; 313. a third groove; 314. a fourth groove; 315. a fifth groove; 316. a sixth groove; 317. a seventh groove; 318. an eighth groove; 319. a ninth tank; 320. a tenth slot; 321. an eleventh tank; 322. a twelfth groove; 323. a thirteenth groove; 324. a fourteenth slot; 325. a fifteenth tank; 326. a sixteenth slot; 327. a seventeenth groove; 328. an eighteenth groove; 329. a nineteenth groove; 330. a twentieth slot; 331. a twenty-first slot; 332. a twenty-second slot; 333. a twenty-third slot; 334. a twenty-fourth slot; 335. a twenty-fifth groove; 336. a twenty-sixth groove; 337. a twenty-seventh groove; 338. a twenty-eighth slot; 339. a twenty-ninth slot; 340. a thirtieth groove; 341. a thirty-first groove; 342. a thirty-second slot; 343. a thirty-third slot; 344. a thirty-fourth slot; 345. a thirty-fifth slot; 346. a thirty-sixth slot; 347. a thirty-seventh slot; 348. a thirty-eighth slot; 349. a thirty-ninth slot; 350. a forty-th groove; 351. a forty-first slot; 352. a forty-second slot; 353. a forty-third slot; 354. a forty-fourth slot; 355. a forty-fifth slot; 356. a forty-sixth groove; 357. a forty-seventh groove; 358. a forty-eighth slot;

41. a phase A terminal; 42. a B-phase terminal; 43. a C-phase terminal; 44. a connector.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1, the present embodiment provides a stator of an electric motor, which includes a stator core 1 having a cylindrical structure, and as shown in fig. 2, a plurality of slots are formed in the stator core 1 and penetrate axially, and the slots are uniformly distributed along the circumferential direction of the stator core 1. Specifically, the stator core 1 has an annular portion and a plurality of teeth 11 that are circumferentially and uniformly distributed on an inner wall of the annular portion, each tooth 11 is disposed to penetrate in an axial direction of the stator core 1, and two adjacent teeth 11 form a slot, in this embodiment, the number of the slots is 48.

As shown in fig. 3, the motor stator further includes a stator winding 2, which includes a first coil unit, a second coil unit and a third coil unit that are sequentially disposed along the radial direction of the stator core 1, and each coil unit includes a plurality of conductors having two slot interiors. Wherein the first coil unit may be an inner coil unit 21, and the third coil unit is an outer coil unit 23; the first coil unit may be the outer coil unit 23, and the third coil unit may be the inner coil unit 21. In the present embodiment, the first coil unit is the inner coil unit 21, and the third coil unit is the outer coil unit 23.

As shown in fig. 5-6, each coil unit includes a plurality of windings, at least two conductors disposed adjacent to each other form a set of phase conductors, each winding includes three sets of phase conductors, in this embodiment, each set of phase conductors includes two conductors, the three sets of phase conductors are two a-phase conductors, two B-phase conductors and two C-phase conductors, two slot interiors of each conductor are respectively a wire inlet slot interior 211 and a wire outlet slot interior 212, an out-slot turning portion 214 connected to the two slot interiors and forming a U-shaped structure with the two slot interiors, and a slot outer end portion 213 connected to the two slot interiors respectively, the two slot outer end portions 213 of each conductor are both located at one axial end of the stator core 1, and the out-slot turning portion 214 is located at the other axial end of the stator core 1; each slot outer end 213 extends substantially in the circumferential direction of the stator core 1. The above-mentioned a phase, B phase and C phase merely represent different phases, and do not represent a current direction, wherein the a phase, B phase and C phase each refer to any one of the U phase, V phase and W phase, and respectively represent different phases.

The pole pitch is the number of phases of each winding multiplied by the number of magnetic poles of each group of phase conductors, the coil unit with the pitch smaller than the pole pitch is a short-pitch coil unit, and the coil unit with the pitch equal to the pole pitch is a whole-pitch coil unit; in this embodiment, the inner coil unit 21 is a short-pitch coil unit, two slot interiors of each conductor in the middle coil unit 22 are located in two adjacent layers, the pitch of the middle coil unit 22 is greater than or less than the pole pitch of the stator winding 2, and the pitch of the outer coil unit 23 is a full pitch.

Specifically, each winding includes 3 sets of phase conductors, each set of phase conductors includes two conductors, the number of poles of each corresponding set of phase conductors is 2, and then the pole pitch is 2 × 3 — 6, that is, the pole pitch of the stator winding 2 is six, in this embodiment, the pitch of the inner coil unit 21 is five, the pitch of the middle coil unit 22 is seven, and the pitch of the outer coil unit 23 is six.

Through setting up first coil unit to the short pitch, set up second coil unit to the coil unit that the pitch is less than the polar distance or the coil unit complex mode that the pitch is greater than the polar distance, can directly adopt welded mode to connect each outer tip 213 of groove, cancel the use of busbar, realized the simplification of 2 coiling processes of stator winding, enlarged application scope, further improved production efficiency, reduced manufacturing cost.

Each slot is divided into M layers according to the number of slot interiors that can be accommodated in the radial direction of the stator core 1, where M is an integer equal to or greater than 3, and the outer coil unit 23 may be provided on the side of the middle coil unit 22 away from the inner coil unit 21, or the outer coil unit 23 may be absent, specifically, for an odd-numbered layer motor in which M is 3, the number of the outer coil units 23 is zero, and preferably, M is 3 to 12 layers. When M is an even number, this type of motor is called an even-numbered motor, and hereinafter, taking M as an example of 4, one outer coil unit 23 is provided, and the winding method of the stator winding 2 will be described in detail.

As shown in fig. 4, each slot is divided into four layers, a first layer, a second layer, a third layer and a fourth layer, in a direction in the radial direction of the stator core 1 and away from the central axis thereof.

As shown in fig. 5, in the present embodiment, two slot interiors of each conductor in the inner coil unit are located in the same layer, that is, both are located in the first layer, since the stator core 1 has 48 slots, then the inner coil unit 21 is formed by winding 24 conductors, that is, the inner coil unit 21 includes four windings, that is, a first winding, a second winding, a third winding and a fourth winding, the four windings are uniformly distributed along the circumferential direction of the stator core, each winding includes two a-phase conductors, two B-phase conductors and two C-phase conductors, which are sequentially distributed, and the slot inlet interior 211 of each group of phase conductors is located in two adjacent slots.

The stator winding is formed by winding a plurality of first conductors, a plurality of second conductors, and a plurality of third conductors, as shown in fig. 5 and 6, the inner coil unit 21 is formed by winding a plurality of first conductors, each outer slot end 213 extends substantially along the circumferential direction of the stator core 1, referring to fig. 6, each outer slot end of a first conductor is located on the same side of the inner slot adjacent thereto, specifically, the outer slot end adjacent to the inner slot 211 of the wire inlet slot is located on the right side of the inner slot of the wire inlet slot, the outer slot end adjacent to the inner slot 212 of the wire outlet slot is also located on the right side of the inner slot of the wire outlet slot, and the outer slot ends 213 of the inner coil unit 21 are distributed in the same circumferential direction of the stator core 1, that is, they are distributed in a curved manner in the clockwise direction (clockwise direction as shown in.

In each set of phase conductors of the inner coil unit 21, the directions of distribution of the wire inlet groove inner portion 211 and the wire outlet groove inner portion 212 of each conductor along the circumferential direction of the stator core 1 are opposite, referring to fig. 6 and 7, the wire inlet groove inner portion 211 and the wire outlet groove inner portion 212 of a11 in the a-phase conductor are distributed in the clockwise direction (referring to the clockwise direction shown in fig. 7), and the wire inlet groove inner portion 211 and the wire outlet groove inner portion 212 of a12 in the a-phase conductor are distributed in the counterclockwise direction (the direction opposite to the direction shown in the clockwise direction in fig. 7).

The two slot interiors of each conductor in the inner coil unit and the slot outer end 213 adjacent to each slot interior are located on the same layer and are both located on the first layer. In the inner coil unit 21, the slot inlet portions 211 of the plurality of conductors of each winding are sequentially accommodated in the slots provided adjacently; along the circumferential distribution direction of stator core 1, the number of slots at intervals between the slots where two adjacent wire inlet slot inner portions 211 of two adjacent windings of inner coil unit 21 are located is six, for example: six slots are arranged between the inner part of the wire inlet groove of the C12 in the C-phase conductor of the first winding and the inner part of the wire inlet groove of the A13 in the A-phase conductor of the second winding.

The winding distribution of the four windings of the inner coil unit is the same, and the following description will be made in detail only with respect to the winding distribution of the adjacent two windings (the first winding and the second winding). With particular reference to fig. 2 and 5, in the first winding, the wire inlet slot interior 211 of a11 is located at the first level of the first slot 311, and the wire outlet slot interior 212 of a11 is located at the first level of the forty-fourth slot 354; the wire inlet groove interior 211 of A12 is located at the first level of the second groove 312, and the wire outlet groove interior 212 of A12 is located at the first level of the seventh groove 317; the wire inlet groove inner part 211 of B11 is positioned at the first layer of the third groove 313, and the wire outlet groove inner part 212 of B11 is positioned at the first layer of the forty-sixth groove 356; the wire inlet groove interior 211 of B12 is located at the first level of the fourth groove 314, and the wire outlet groove interior 212 of B12 is located at the first level of the ninth groove 319; the wire inlet groove interior 211 of C11 is located at the first level of the fifth groove 315, and the wire outlet groove interior 212 of C11 is located at the first level of the forty-eighth groove 358; the wire inlet groove interior 211 of C11 is located at the first level of the sixth groove 316, and the wire outlet groove interior 212 of C11 is located at the first level of the eleventh groove 321.

In the second winding, the wire inlet groove inner part 211 of A13 is positioned at the first layer of the thirteenth groove 323, and the wire outlet groove inner part 212 of A13 is positioned at the first layer of the eighth groove 318; the wire inlet groove inner part 211 of A14 is positioned at the first layer of the fourteenth groove 324, and the wire outlet groove inner part 212 of A14 is positioned at the first layer of the nineteenth groove 329; the wire inlet groove inner part 211 of B13 is positioned at the first layer of the fifteenth groove 325, and the wire outlet groove inner part 212 of B13 is positioned at the first layer of the tenth groove 320; the wire inlet groove interior 211 of B14 is located at the first level of the sixteenth groove 326, and the wire outlet groove interior 212 of B14 is located at the first level of the twenty-first groove 331; the wire inlet groove inner part 211 of C13 is positioned at the first layer of the seventeenth groove 327, and the wire outlet groove inner part 212 of C13 is positioned at the first layer of the twelfth groove 322; the wire inlet slot interior 211 of C14 is located at the first level of the eighteenth slot 328 and the wire outlet slot interior 212 of C14 is located at the first level of the twenty-third slot 333.

The outside-groove turning part 214 includes a first extending part 2141, a turning part 2142, a second extending part 2143 and a turning part 2144 which are connected in sequence, and the first extending part 2141 and the turning part 2144 are respectively connected to the inside of the two grooves; in each conductor of the inner coil unit 21, the first extension portions 2141 and the insides of the slots adjacent thereto are located in the same layer and are all located in the first layer; the second extension portion 2143 of each conductor of the inner coil unit 21 is located on one side of the layer where the first extension portion 2141 is located near the central axis of the stator core 1, and the turn portion 2142 and the turn portion 2144 are both partially located on one side of the layer where the first extension portion 2141 is located near the central axis of the stator core 1, and partially located on one layer where the first extension portion 2141 is located. Both tank interiors are located in the first tier by the cooperation of the turn 2142 and the turn 2144. The entire outside-slot bent portion 214 is positioned at the first level, and the other portion is protruded toward the side close to the center axis of the stator core 1, and this position is referred to as a virtual zero level.

Since each of the out-of-slot turns in each phase winding of the inner coil unit has the same structure as the corresponding out-of-slot turns in the other windings, the positions thereof can be determined according to the corresponding in-slot portions, and the following detailed description will be given only with respect to the distribution of the out-of-slot turns corresponding to a11 and a 12. Example (c): the wire inlet groove interior 211 of a11 is located at the first layer of the first groove 311, the first extension portion 2141 connected with the wire inlet groove interior of a11 is located at the first layer, the turning portion 2142 crosses from the first layer into the virtual zero layer, the second extension portion 2143 is located at the virtual zero layer, and the turning portion 2144 crosses from the virtual zero layer into the first layer and then is connected to the wire outlet groove interior 212 of a 11. The inner portion 211 of the wire inlet groove of a12 is located at the first layer of the first groove 311, the connecting bend portion 2144 with the inner portion of the wire inlet groove of a12 crosses into the virtual zero layer from the first layer, the second extension portion 2143 connected with the bend portion 2144 is located at the virtual zero layer, the turn portion 2142 connected with the second extension portion 2143 crosses into the first layer from the virtual zero layer, the first extension portion 2141 connected with the turn portion 2142 is located at one layer, and then is connected with the inner portion 212 of the wire outlet groove. In this embodiment, the projections of the curved portion 2144 and the second extension portion 2143 connected thereto on the axial section of the stator core 1 parallel to the second extension portion 2143 are located on the same straight line, and in the projection on the axial section of the stator core 1 perpendicular to the second extension portion, the length of the curved portion 2144 is twice the width of a single conductor.

In this embodiment, the turning portion 2144 of the inner coil unit 21 may be protruded from the layer where the second extension portion 2143 is located to a side away from the central axis of the stator core 1. Only the distribution of the out-of-slot turns corresponding to a11 will be described in detail below. Example (c): the wire inlet groove interior 211 of a11 is located at the first layer of the first groove 311, the first extension portion 2141 connected with the wire inlet groove interior of a11 is located at the first layer, the turn portion 2142 crosses from the first layer into the second layer, the second extension portion 2143 is located at the second layer, and the turn portion 2144 crosses from the second layer into the first layer and then is connected to the wire outlet groove interior 212 of a 11.

As shown in fig. 8, each conductor of the middle coil unit 22 includes two slot interiors and the two slot interiors are located in adjacent two layers, specifically occupying the second layer and the third layer of the stator core 1, respectively, and the slot outer end 213 adjacent to each slot interior and the slot interior are located in the same layer; stator core 1 has 48 slots, and then interior coil unit 21 is formed by 48 conductor coiling, and it is divided into eight windings, is first winding, second winding, the.

The middle coil unit 22 is formed by winding a plurality of second conductors, and referring to fig. 9, the distance between the inside of the wire inlet slot of each second conductor and the inside of the corresponding wire outlet slot is 7, that is, the long pitch, and the outer end of each slot of the second conductor extends along the circumferential direction of the stator core and in the direction away from the outer end of the other slot. As shown in fig. 10, in each set of phase conductors of the intermediate coil unit 22, the distribution direction of the wire inlet groove inner portion 211 and the wire outlet groove inner portion 212 of each conductor along the circumferential direction of the stator core 1 is the same, the wire inlet groove inner portion 211 and the wire outlet groove inner portion 212 of a21 in the a-phase conductor are distributed in the counterclockwise direction (refer to the counterclockwise direction shown in fig. 10), and the wire inlet groove inner portion 211 and the wire outlet groove inner portion 212 of a-phase conductor a22 are also distributed in the counterclockwise direction (refer to the counterclockwise direction shown in fig. 10). Referring to fig. 8, in the middle coil unit, the distribution directions of the outer slot ends 213 located in the same layer along the circumferential direction of the stator core 1 are the same, the distribution directions of the outer slot ends 213 located in two radially adjacent layers of the stator core 1 along the circumferential direction of the stator core 1 are opposite, that is, the outer slot ends 213 located in the second layer are distributed in a curved manner counterclockwise (referring to the counterclockwise direction shown in fig. 8), and the outer slot ends 213 located in the third layer are distributed in a curved manner clockwise (referring to the counterclockwise direction shown in fig. 8).

In the intermediate coil unit 22, the slot-in portions 211 of the plurality of conductors of each winding are sequentially accommodated in the slots provided adjacently; along stator core 1's circumference distribution direction, two adjacent inlet wire inslot portions 211 of two adjacent windings of inboard coil unit 21 are adjacent to be set up in the groove, for example: the groove inside the wire inlet groove of the C22 of the first winding and the groove inside the wire inlet groove of the A23 of the second winding are adjacently arranged grooves. In each conductor of the middle coil unit 22, the first extension portion 2141 and the second extension portion 2143 are located on the same layer with the inside of the adjacent slot, the turn portion 2144 and the second extension portion 2143 are located on the same layer, a part of the turn portion 2142 is located on the layer where the first extension portion 2141 is located, and a part of the turn portion 2142 is located on the layer where the second extension portion 2143 is located, and the two slots of each conductor are located on the second layer and the third layer respectively through the turn portion 2142.

Each of the out-of-slot turns of the middle coil unit 22 is partially located at the second level and partially located at the third level, and since each of the out-of-slot turns of the middle coil unit 22 has the same structure, the location thereof can be determined according to the corresponding in-slot portion, and the following detailed description will be given only with respect to the distribution of the out-of-slot turns corresponding to a 21. Example (c): the wire inlet groove interior 211 of a21 is located at the second layer of the first groove 311, the first extension portion 2141 connected with the wire inlet groove interior 211 of a21 is located at the second layer, the turn portion 2142 spans from the second layer to the third layer, the second extension portion 2143 is located at the third layer, the turn portion 2144 is also located at the third layer, and then is connected to the wire outlet groove interior 212 of a 21. In addition, in this embodiment, the projections of the curved portion 2144 and the second extending portion 2143 connected thereto on the axial section of the stator core 1 parallel to the second extending portion 2143 are located on the same straight line, and the curved portion 2144 may have a curve in the third layer, but may be completely in the third layer, or may have no curve, that is, the curved portion 2144 and the second extending portion 2143 form a straight line structure.

Since the eight windings of the middle coil unit 22 are distributed in the same manner, and the outer end 213 of each slot of each conductor is located at the same level as the adjacent slot, and the first extension portion 2141, the second extension portion 2143, the turn portion 2142, and the turn portion 2144 can be determined according to the distribution of the two slots of each conductor, the following description will be given in detail by taking only the specific rules of the two adjacent windings (the first winding and the second winding) as an example.

With particular reference to fig. 2 and 10, in the first winding, the wire inlet slot interior 211 of a21 is located at the second level of the first slot 311, and the wire outlet slot interior 212 of a21 is located at the third level of the eighth slot 318; the wire inlet groove interior 211 of a22 is located at the second level of the forty-eighth groove 358, and the wire outlet groove interior 212 of a22 is located at the third level of the seventh groove 317; the wire inlet groove interior 211 of B21 is located at the second level of the second groove 312, and the wire outlet groove interior 212 of B21 is located at the third level of the ninth groove 319; the wire inlet groove inner part 211 of B22 is positioned at the second layer of the third groove 313, and the wire outlet groove inner part 212 of B22 is positioned at the third layer of the tenth groove 320; the wire inlet groove inner part 211 of C21 is positioned at the second layer of the fourth groove 314, and the wire outlet groove inner part 212 of C21 is positioned at the third layer of the eleventh groove 321; the wire inlet channel interior 211 of C22 is located at the second level of the fifth channel 315, and the wire outlet channel interior 212 of C22 is located at the third level of the twelfth channel 322.

In the second winding, the wire inlet groove inner part 211 of A23 is positioned at the second layer of the sixth groove 316, and the wire outlet groove inner part 212 of A23 is positioned at the third layer of the thirteenth groove 323; the wire inlet groove inner part 211 of A24 is positioned at the second layer of the seventh groove 317, and the wire outlet groove inner part 212 of A24 is positioned at the third layer of the fourteenth groove 324; the wire inlet groove inner part 211 of the B24 is positioned at the second layer of the eighth groove 318, and the wire outlet groove inner part 212 of the B24 is positioned at the third layer of the fifteenth groove 325; the wire inlet groove inner part 211 of B25 is positioned at the second layer of the ninth groove 319, and the wire outlet groove inner part 212 of B25 is positioned at the third layer of the sixteenth groove 326; the wire inlet groove inner part 211 of the C24 is positioned at the second layer of the tenth groove 320, and the wire outlet groove inner part 212 of the C24 is positioned at the third layer of the seventeenth groove 327; the wire inlet groove interior 211 of C25 is located at the second level of the eleventh groove 321, and the wire outlet groove interior 212 of C25 is located at the third level of the eighteenth groove 328.

As shown in fig. 11, each conductor of the outer coil unit 23 includes two slot interiors and the two slot interiors are located on the same layer of the stator core 1, that is, on the fourth layer of the stator core 1, and the slot outer end 213 adjacent to each slot interior is also located on the fourth layer; the stator core 1 has 48 slots, and the inner coil unit 21 is formed by winding 24 conductors, and is divided into four windings, namely a first winding, a second winding, a third winding and a fourth winding, wherein the four windings are uniformly distributed along the circumferential direction of the stator core.

The outer coil unit 23 is formed by winding a plurality of third conductors, and referring to fig. 12, each of the outer ends of the slots of the third conductors is located on the same layer as the adjacent slot inside, and the outer ends 213 of the slots of the outer coil unit 23 are distributed in the same direction along the circumferential direction of the stator core 1, that is, are distributed in a curved manner in the clockwise direction (referring to the clockwise direction shown in fig. 13) with respect to the slot inside. And the pitch of the outer coil unit 23 is equal to the pole pitch of the stator winding 2.

The second extension portion 2143 of each conductor of the outer coil unit 23 is located on one side of the layer where the first extension portion 2141 is located and away from the central axis of the stator core 1, the turn portion 2142 and the turn portion 2144 are both partially located on one side of the layer where the first extension portion 2141 is located and away from the central axis of the stator core 1, and partially located on one layer where the first extension portion 2141 is located, so that the whole portion of the out-of-slot turn portion 214 is located on the fourth layer, and the other portions are protruded to one side away from the central axis of the stator core 1, which is referred to as a virtual five layer.

Since each of the out-of-slot turns of the outer coil unit 23 has the same structure, the position thereof can be determined according to the corresponding in-slot portion, and the following detailed description will be given only with respect to the distribution of the out-of-slot turns corresponding to a 31. Example (c): the wire inlet groove interior 211 of the a31 is located at the fourth layer of the first groove 311, the first extension portion 2141 connected with the wire inlet groove interior of the a31 is located at the fourth layer, the turning portion 2142 spans from the fourth layer to the virtual five layers, the second extension portion 2143 is located at the virtual five layers, the turning portion 2144 spans from the virtual five layers to the fourth layer, and then is connected to the wire outlet groove interior 212 of the a 31. In this embodiment, the projections of the bent portions 2144 and the second extending portions 2143 connected thereto on the axial section of the stator core 1 parallel to the second extending portions 2143 are located on the same straight line, and the length of the bent portions 2144 is twice the width of a single conductor in the projection on the axial section of the stator core 1 perpendicular to the second extending portions.

As shown in fig. 11, in each set of phase conductors of the outer coil unit 23, the distribution direction of the wire inlet groove inner portion 211 and the wire outlet groove inner portion 212 of each conductor in the circumferential direction of the stator core 1 is the same, as shown in fig. 12 and 13, the wire inlet groove inner portion 211 and the wire outlet groove inner portion 212 of a31 in the a-phase conductor are distributed in the counterclockwise direction (refer to the counterclockwise direction shown in fig. 13), and the wire inlet groove inner portion 211 and the wire outlet groove inner portion 212 of a32 in the a-phase conductor are also distributed in the counterclockwise direction (the direction opposite to the counterclockwise direction shown in fig. 13).

In this embodiment, the inner coil unit 21 is formed by winding a plurality of first conductors, the middle coil unit 22 is formed by winding a plurality of second conductors, the outer coil unit 23 is formed by winding a plurality of third conductors, and each coil unit is formed by winding conductors with the same structure, so that the winding mode is simplified, and the winding efficiency is improved.

As shown in fig. 13, in the outer coil unit 23, the plurality of line inlet groove inner portions 211 of each winding are sequentially accommodated in the adjacently arranged grooves, and six grooves are provided between the adjacent two line inlet groove inner portions of the adjacent two sets of phase conductors of each winding, for example: the inside of the wire inlet groove of the a31 of the first winding is located in the first slot 311, the inside of the wire inlet groove of the a32 of the first winding is located in the forty-eighth slot 358, the inside of the wire inlet groove of the C32 of the first winding is located in the forty-fourth slot 354, and then the inside of the wire inlet groove of the a33 of the second winding is located in the thirteenth slot 323.

The distribution directions of the inside of the wire inlet groove and the inside of the wire outlet groove of two adjacent groups of phase conductors in each phase winding along the circumferential direction of the stator core are opposite, for example: the inside of the wire inlet groove and the inside of the wire outlet groove of the a31 and the a32 are both distributed in the clockwise direction (refer to the clockwise direction shown in fig. 13), the inside of the wire inlet groove and the inside of the wire outlet groove of the B31 and the B32 are both distributed in the counterclockwise direction (the direction opposite to the clockwise direction shown in fig. 13), and the inside of the wire inlet groove and the inside of the wire outlet groove of the C31 and the C32 are both distributed in the clockwise direction (refer to the clockwise direction shown in fig. 13). The above definition of the slot inner and outer ends causes each slot outer end 213 of the outer coil unit 23 to be distributed in a clockwise direction (clockwise direction as viewed in fig. 13) so that the stator winding can be soldered between the respective slot outer ends without using a return bar.

In this embodiment, in the outer coil unit 23, the distribution directions of the inside of the wire inlet slot and the inside of the wire outlet slot of two adjacent sets of phase conductors in each phase winding along the circumferential direction of the stator core may also be the same, for example: the inside of the wire inlet groove and the inside of the wire outlet groove of the a31 and the a32 are both distributed in the clockwise direction (refer to the clockwise direction shown in fig. 14), the inside of the wire inlet groove and the inside of the wire outlet groove of the B31 and the B32 are both distributed in the clockwise direction (refer to the clockwise direction shown in fig. 14), and the inside of the wire inlet groove and the inside of the wire outlet groove of the C31 and the C32 are both distributed in the clockwise direction (refer to the clockwise direction shown in fig. 14). The outer coil unit with the structure can also realize the effect of reducing the use of the bus bar by matching with the middle coil unit and the inner coil unit.

Since the distribution rule of the four windings of the outer coil unit 23 is the same, and the outer end portion 213 of each slot is located at the same layer as the adjacent slot interior, and the first extension portion 2141, the second extension portion 2143, the turn portion 2142, and the turn portion 2144 can be confirmed by referring to the distribution rule of the slot interior and the slot exterior turn portion, the following description will be given in detail by taking only the specific rule of the slot interior of the adjacent two windings (the first winding and the second winding) as an example.

With particular reference to fig. 2 and 13, in the first winding, the wire inlet slot interior 211 of a31 is located at the fourth level of the first slot 311, and the wire outlet slot interior 212 of a31 is located at the fourth level of the forty-third slot 353; the wire inlet groove interior 211 of a32 is located at the fourth level of the forty-eight grooves 358, and the wire outlet groove interior 212 of a32 is located at the fourth level of the fourth twelve grooves 352; the wire inlet groove inner part 211 of B31 is positioned at the fourth layer of the forty-sixth groove 356, and the wire outlet groove inner part 212 of B31 is positioned at the fourth layer of the fourth groove 314; the wire inlet groove inner part 211 of B32 is positioned at the fourth layer of the seventeenth groove 357, and the wire outlet groove inner part 212 of B32 is positioned at the fourth layer of the fifth groove 315; the wire inlet groove inner part 211 of C31 is positioned at the fourth layer of the forty-fifth groove 355, and the wire outlet groove inner part 212 of C31 is positioned at the fourth layer of the thirty-ninth groove 349; the wire inlet groove interior 211 of C32 is located at the fourth level of the fourteenth groove 354 and the wire outlet groove interior 212 of C32 is located at the fourth level of the thirty-eighth groove 348.

In the second winding, the wire inlet groove inner part 211 of A33 is positioned at the fourth layer of the thirteenth groove 323, and the wire outlet groove inner part 212 of A33 is positioned at the fourth layer of the seventh groove 317; the wire inlet groove inner part 211 of A34 is positioned at the fourth layer of the twelfth groove 322, and the wire outlet groove inner part 212 of A34 is positioned at the fourth layer of the sixth groove 316; the wire inlet groove inner part 211 of the B33 is positioned at the fourth layer of the eleventh groove 321, and the wire outlet groove inner part 212 of the B33 is positioned at the fourth layer of the seventeenth groove 327; the wire inlet groove inner part 211 of the B34 is positioned at the fourth layer of the tenth groove 320, and the wire outlet groove inner part 212 of the B34 is positioned at the fourth layer of the sixteenth groove 326; the wire inlet groove inner part 211 of C33 is positioned at the fourth layer of the ninth groove 319, and the wire outlet groove inner part 212 of C33 is positioned at the fourth layer of the third groove 313; the wire inlet groove interior 211 of C34 is located at the fourth level of the eighth groove 318, and the wire outlet groove interior 212 of C34 is located at the fourth level of the second groove 312.

When the outer ends 213 of the slots of the motors of the even number layers are welded in series, the outer ends of the two slots of each conductor are respectively the outer end of a wire inlet slot and the outer end of a wire outlet slot; for the conductors in the same phase, a plurality of conductors are sequentially connected, the outer end part of an outgoing line slot of one conductor in two conductors adjacent to each other in the connecting direction is welded with the outer end part of an incoming line slot of the other conductor, the outer end part of the outgoing line slot positioned on the outermost side in the connecting direction is a neutral point of the phase, the outer end part of the outgoing line slot positioned on the outermost side in the connecting direction is connected with a phase terminal through the outer end part of the incoming line slot positioned on the same radial direction and adjacent to the phase terminal, and except the neutral point and the outer end part of the incoming line slot connected with the phase terminal, each of the other outer end parts 213 is welded with the outer end part 213 of the other conductor positioned.

Furthermore, the phase terminal and the neutral point which are correspondingly connected with the outer end part of the wire inlet and outlet groove can be arranged on any layer of the outer end part of the motor groove.

Since all the a-phase conductors, all the B-phase conductors, and all the C-phase conductors are connected in series in the same manner, the series connection of all the a-phase conductors will be described in detail below as an example. Referring to fig. 15, the series welding process for all phase a conductors is as follows:

the phase-A terminal 41 is connected with the outer end part of the wire inlet groove of one conductor, all the phase-A conductors are sequenced according to the welding sequence, and Ai, i is 1, 2, 3, 32, Ai-1 is the outer end part of the wire inlet groove of a single conductor, and Ai-2 is the outer end part of the wire outlet groove of the single conductor.

A1-1 to A1-2, A1-2 are welded to A2-1, A2-1 to A2-2, A2-2 is welded to A3-1, A3-1 to A3-2, A3-2 is welded to A4-1, A4-1 to A4-2, A4-2 is welded to A5-1, A5-1 to A5-2, A5-2 is welded to A6-1, A6-1 to A6-2, A6-1 to A6-1, A6-1 to A6-2, A6-72-1 to A6-2, A6-1 to A6-2, a11-1 to A11-2, A11-2 are welded to A12-1, A12-1 to A12-2, A12-2 is welded to A13-1, A13-1 to A13-2, A13-2 is welded to A14-1, A14-1 to A14-2, A14-2 is welded to A15-1, A15-1 to A15-2, A15-2 is welded to A16-1, A16-1 to A16-2, A16-2 is welded to A16-1, A16-18 to A16-2, A16-2 is welded to A16-1, A16-1 to A16-2, A16-72-1 to A16-2, A16-1 to A16-2, a22-1 to A22-2, A22-2 are welded to A23-1, A23-1 to A23-2, A23-2 is welded to A24-1, A24-1 to A24-2, A24-2 is welded to A25-1, A25-1 to A25-2, A25-2 is welded to A26-1, A26-1 to A26-2, A26-2 is welded to A26-1, A26-1 to A26-2, A282 is welded to A26-1, A26-1 to A26-2, A26-2 is welded to A26-1, A26-1 to A26-2, A26-1 to A26-2.

B-phase terminals 42 and B32-2 are led out of all B-phase conductors, C-phase terminals 43 and C32-2 are led out of all C-phase conductors, and neutral point connection is carried out on three points of A32-2, B32-2 and C32-2 through a connecting body 44, so that series welding of the motors of the even layers is completed. The welding means may be ultrasonic welding, laser welding or friction stir welding.

In the embodiment, the outer end parts 213 of the slots are connected in a welding mode, the connecting body 44 is adopted for neutral point connection, a bus bar is not needed, the connection among the outer end parts 213 of the slots of the motor stator is greatly simplified, the processing technology is simplified, the production cost is reduced, and the production efficiency is improved.

Two inslot portions of every conductor in the inside coil unit and the outer tip of groove that borders on with corresponding inslot portion all are located the same floor, make the rotor can follow the one end that sets up the outer tip of groove in the stator winding inside coil unit and insert, this end of stator winding does not have to the convex part in stator core center, can not cause the interference to the installation of rotor, and can not increase the length of stator core tooth portion, improve the utilization ratio in groove, increase power density, the volume of motor stator has been reduced, the cost of motor has been reduced.

The embodiment also provides a motor, which comprises the motor stator, and the motor adopting the motor stator can reduce the production cost and improve the production efficiency.

Example two

The present embodiment is different from the first embodiment in that M is an odd number, and this type of motor is referred to as an odd-numbered motor, as shown in fig. 16, and in the present embodiment, M is 5, that is, the number of slots that can be accommodated in the radial direction of the stator core 1 in each slot divides each slot into five layers, i.e., a first layer, a second layer, a third layer, a fourth layer, and a fifth layer. The distribution of the inner coil unit 21 and the middle coil unit 22 is the same as in the first embodiment, and only the specific distribution of the outer coil unit 23 will be described in detail.

As shown in fig. 17, two slot interiors of each conductor in the outer coil unit 23 are located in two adjacent layers, the slot outer end 213 adjacent to the slot interior close to the intermediate coil unit 22 is located in the same layer as the slot interior, that is, in the fourth layer, part of the slot outer end 213 adjacent to the slot interior located in the outermost layer is located in the same layer as the slot interior, that is, in the fifth layer, and the other slot outer end 213 adjacent to the slot interior located in the outermost layer extends from the layer in which the slot interior is located to the side away from the central axis of the stator core, that is, extends from the fifth layer to the outside of the fifth layer. The pitch of the outer coil unit 23 is larger or smaller than the pole pitch of the stator winding 2.

In this embodiment, the outer coil unit 23 is formed by winding a plurality of third conductors and a plurality of second conductors, that is, the outer coil unit 23 is formed by winding two types of conductors, and the inner coil unit 21 and the intermediate coil unit 22 are formed by winding a plurality of first conductors and a plurality of second conductors, respectively.

As shown in fig. 17, in the outer coil unit 23, the distribution directions of the slot outer ends 213 located in the same layer along the circumferential direction of the stator core 1 are the same, and the distribution directions of the slot outer ends 213 located in the two adjacent layers along the circumferential direction of the stator core 1 are opposite; the distribution direction of the outer end part of the slot extending from the outermost layer to one side far away from the central axis of the stator core along the circumferential direction of the stator core is the same, and the distribution direction of the outer end part of the slot positioned at the outermost layer along the circumferential direction of the stator core is opposite. Specifically, the outer slot ends 213 adjacent to the inside of the slot close to the intermediate coil unit 22 are distributed in the same direction in the circumferential direction of the stator core 1, that is, each outer slot end 213 located in the fourth layer is distributed in a curved manner in the counterclockwise direction (the direction opposite to the clockwise direction shown in fig. 17), each outer slot end 213 located in the fifth layer is distributed in the clockwise direction of the stator core 1, and the outer slot ends 213 extending from the fifth layer to the side away from the central axis of the stator core are distributed in the counterclockwise direction of the stator core 1.

The distribution of the out-of-slot bent portions 214 of the outer coil unit 23 is the same as the distribution of the out-of-slot bent portions 214 of the middle coil unit 22, and will not be described in detail. Since the distribution laws of the a-phase conductor, the B-phase conductor, and the C-phase conductor in the outer coil unit 23 are the same, and the slot occupation and layer occupation distribution laws in the slot of the outer coil unit 23 are the same as the slot occupation and layer occupation distribution laws in the slot of the middle coil unit 22, except that the two slots of each conductor of the outer coil unit 23 are respectively located at the fourth layer and the fifth layer, the following description specifically describes the distribution laws of the slot outer end 213 in the outer coil unit 23 only by taking the a-phase conductor in the outer coil unit 23 as an example.

As shown in fig. 18, two outer ends 213 of each conductor are respectively used as a wire inlet outer end 213 and a wire outlet outer end 213, the outer end 213 located at the outermost layer is selected as the wire inlet outer end 213, each conductor of the outer coil unit 23 is denoted as A3j, the wire inlet outer end 213 of A3j is denoted as A3j-1, and the wire outlet outer end 213 is denoted as A3j-2, j is 1, 2, 3.

A31-1 is located at the fifth level and extends in a clockwise direction, A31-2 is located at the fourth level and extends in a counterclockwise direction (opposite to the clockwise direction shown in FIG. 18), A32-1 is located at the fifth level and extends in a clockwise direction, and A32-2 is located at the fourth level and extends in a counterclockwise direction; a33-1 extends in a counterclockwise direction from the fifth layer to the virtual six layer, and A33-2 is located at the fourth layer and extends in a counterclockwise direction; a34-1 extends in a counterclockwise direction from the fifth layer to the virtual six layer, and A34-2 is located at the fourth layer and extends in a counterclockwise direction; a35-1 extends from the fifth layer in clockwise direction, A35-2 is located at the fourth layer and extends in counterclockwise direction; a36-1 extends from the fifth layer in clockwise direction, A36-2 is located at the fourth layer and extends in counterclockwise direction; a37-1 extends in a counterclockwise direction (with reference to the clockwise direction shown in FIG. 18) from the fifth layer to the virtual six layer, and A37-2 is located at the fourth layer and extends in a counterclockwise direction; a38-1 extends in a counterclockwise direction from the fifth layer to the virtual six layer, and A38-2 is located at the fourth layer and extends in a counterclockwise direction; a39-1 extends from the fifth layer in clockwise direction, A39-2 is located at the fourth layer and extends in counterclockwise direction; a310-1 extends from the fifth layer in a clockwise direction, and A310-2 is located at the fourth layer and extends in a counterclockwise direction; a311-1 extends along the counterclockwise direction from the fifth layer to the virtual six layers, and A311-2 is positioned on the fourth layer and extends along the counterclockwise direction; a312-1 extends along the counterclockwise direction from the fifth layer to the virtual six layers, and A312-2 is positioned on the fourth layer and extends along the counterclockwise direction; a313-1 extends from the fifth layer in a clockwise direction, and A313-2 is located on the fourth layer and extends in a counterclockwise direction; a314-1 extends from the fifth layer in a clockwise direction, and A314-2 is located at the fourth layer and extends in a counterclockwise direction; a315-1 extends from the fifth layer in a counterclockwise direction, and A315-2 is located at the fourth layer in a counterclockwise direction; a316-1 extends from the fifth layer in a counterclockwise direction, and A316-2 is located on the fourth layer in a counterclockwise direction.

When the outer ends 213 of the slots of the motors of the odd number layers are welded in series, the welding rule of the welding rules is the same as that of the outer ends 213 of the slots of the motors of the even number layers, and the series welding process of all the conductors of the phase A is as follows:

as shown in fig. 19, the phase a terminal 41 is connected to the outer end of the wire inlet slot of one of the conductors, and all the phase a conductors are sorted according to the welding order, where Aa, a is 1, 2, 3.

A1-1 to A1-2, A1-2 to A2-1, A2-1 to A2-2, A2-2 to A3-1, A3-1 to A3-2, A3-2 to A4-1, A4-1 to A4-2, A4-2 to A5-1, A5-1 to A5-2 to A5-72-2, A5-1 to A5-72-2 to A5-72-2, A5-72-1 to A5-2 to A5-1, a11-2 connection A12-1, A12-1 to A12-2, A12-2 connection A13-1, A13-1 to A13-2, A13-2 connection A14-1, A14-1 to A14-2, A14-2 connection A15-1, A15-1 to A15-2, A15-2 connection A15-1, A15-18 to A15-2, A15-2 connection A15-1, A15-1 to A15-2, A15-72-2 connection A15-1, A15-72-1 to A15-2, A15-1 to A15-2 connection A15-1, a23-1 to A23-2, A23-2 are connected with A24-1, A24-1 to A24-2, A24-2 is connected with A25-1, A25-1 to A25-2, A25-2 is connected with A26-1, A26-1 to A26-2, A26-2 is connected with A27-1, A27-1 to A27-2, A27-2 is connected with A27-1, A27-1 to A27-2, A282 is connected with A27-1, A27-1 to A27-2, A27-2 is connected with A27-1, A27-1 to A27-2, A27-72-1 to A27-2 is connected with A27-1, A27-72-1 to A27-2 is connected with A27-1, A27-2 is connected with A27-1, a33-2 is connected with A34-1, A34-1 to A34-2, A34-2 is connected with A35-1, A35-1 to A35-2, A35-2 is connected with A36-1, A36-1 to A36-2, A36-2 is connected with A37-1, A37-1 to A37-2, A37-2 is connected with A38-1, A38-1 to A38-2, A38-2 is connected with A39-1, A39-1 to A39-2, A39-2 is connected with A40-1, and A40-1 to A40-2.

B-phase terminals 42 and B40-2 are led out of all B-phase conductors, C-phase terminals 43 and C40-2 are led out of all C-phase conductors, and neutral point connection is carried out on three points of A40-2, B40-2 and C40-2 through a connecting body 44, so that series welding of the odd-layer motor is completed.

In the above embodiment, the pitch of the second coil unit is larger than the pole pitch of the stator winding 2, the pitch of the intermediate coil unit 22 is 7, and the inside of the two slots of each conductor of the intermediate coil unit 22 is disposed in the two slots having the slot pitch of 7; when M is an even number, the pitch of the outer ends of the two slots welded by the conductors is smaller than the pole pitch of the stator winding 2, and in the embodiment, the distance between the outer ends of the two slots welded by the conductors is set to be 5 slot pitches; when M is an odd number, the distance between the outer end part of the coil slot positioned on the fifth layer in the outermost coil unit in the stator winding and the outer end parts of the two slots welded to the outer end part of the coil slot positioned on the virtual six layers is set to be 6 slot pitches, and the distance between the outer end parts of the two slots welded to the rest layers is set to be 5 slot pitches. Through the structure, the welding end can be arranged at any position, and the connection is convenient.

Of course, the pitch of the second coil unit may be set to be smaller than the pole pitch of the stator winding 2, the pitch of the intermediate coil unit 22 may be set to 5, and the inside of the two slots of each conductor of the intermediate coil unit 22 may be disposed in the two slots having the slot pitch of 5; when M is an even number, the pitch of the outer ends of the two slots where the conductors are welded is set to be larger than the pole pitch of the stator winding 2, and in the present embodiment, the distance of the outer ends of the two slots where the conductors are welded is set to be 7 slot pitches; and when M is an odd number, setting the distance between the outer end part of the fifth layer coil slot in the outermost coil unit of the stator winding and the outer end parts of the two slots welded at the outer end parts of the virtual six-layer coil slots as 6 slot pitches, and setting the distance between the outer end parts of the two slots welded at the other two slots as 7 slot pitches.

EXAMPLE III

In this embodiment, the first coil unit, the second coil unit and the third coil unit are respectively an outer coil unit, a middle coil unit and an inner coil unit, that is, the pitch of the outermost coil unit is smaller than the pole pitch of the stator winding and the pitch of the other coil units is equal to the pole pitch of the stator winding. In this case, for the even-numbered layer motor, the winding patterns of the inner coil unit, the intermediate coil unit, and the outer coil unit are respectively the same as those of the outer coil unit, the intermediate coil unit, and the inner coil unit of the first embodiment, and therefore, the description thereof will not be repeated.

For the odd-numbered layer motor, as shown in fig. 20, the structures of the middle coil unit and the middle coil unit in the second embodiment are the same, while the structures of the outer coil unit and the inner coil unit in the second embodiment are substantially the same, except that: the layer occupying distribution rules of the outside-groove turning parts are different.

Specifically, in the outer coil unit in this embodiment, the second extension portion 2143 of each conductor is located on one side of the layer where the first extension portion 2141 is located, which is away from the central axis of the stator core 1, the turn portion 2142 and the turn portion 2144 are both partially located on one side of the layer where the first extension portion 2141 is located, which is away from the central axis of the stator core 1, and partially located on one layer where the first extension portion 2141 is located, so that the whole out-of-slot turn portion 214 is located on the fifth layer, and the other portions are protruded toward one side away from the central axis of the stator core 1, which is referred to as a virtual six layers.

Since each of the out-of-slot turns of the outer coil unit 23 has the same structure, the position thereof can be determined according to the corresponding in-slot portion, and the following detailed description will be given only with respect to the distribution of the out-of-slot turns corresponding to a 31. Example (c): the wire inlet groove interior 211 of the a31 is located at the fifth layer of the first groove 311, the first extension portion 2141 connected with the wire inlet groove interior of the a31 is located at the fifth layer, the turning portion 2142 spans from the fifth layer to the virtual six layer, the second extension portion 2143 is located at the virtual six layer, the turning portion 2144 spans from the virtual six layer to the fifth layer, and then is connected to the wire outlet groove interior 212 of the a 31.

The inner coil unit in this embodiment has substantially the same structure as the outer coil unit in the second embodiment, except that: the outer end part of the partial slot extends from the first layer to one side close to the central axis of the stator core.

Specifically, two slot interiors of each conductor in the outer coil unit 23 are located in two adjacent layers, the outer end 213 of the slot connected with the slot interior close to the middle coil unit 22 is located on the same layer as the slot interior, that is, located on the second layer, the outer end 213 of the partial slot connected with the slot interior located on the innermost layer is located on the same layer as the slot interior, that is, located on the first layer, and the outer ends 213 of other slots connected with the slot interior located on the innermost layer extend from the layer where the slot interior is located to one side close to the central axis of the stator core.

The outer ends of the slots which are to be located on the first layer and extend from the first layer to the virtual zero layer have the same distribution rule as the outer ends of the slots which are selected by the outer coil units in the second embodiment and extend from the fifth layer to the virtual six layers, and the limitation is not repeated here.

According to the two schemes, the outer end parts of the slots can be connected only in a welding mode, the connectors are adopted for neutral point connection, a bus bar is not needed, connection among the outer end parts of the slots of the motor stator is greatly simplified, the processing technology is simplified, the production cost is reduced, and the production efficiency is improved.

The utility model discloses clockwise and anticlockwise all refer to the direction that specific drawing shows among the embodiment of the invention mentions, the utility model discloses every utmost point every phase slot number the stator slot number/motor pole number/phase number, the pole pitch the stator slot number/motor pole number every utmost point every phase slot number phase number, the quantity in groove is not limited to 48 grooves only, can also be the groove of other quantity, for example: the number of slots of each phase of each pole is 2, the corresponding slot poles of the three-phase motor are matched with a 6-pole 36 slot, a 8-pole 48 slot, a 10-pole 60 slot, a 12-pole 72 slot, a 16-pole 96 slot and the like, and the pole distance is 6; the number of slots of each phase of each pole is 3, and the corresponding three-phase motor slot poles are matched with a 6-pole 54 slot, an 8-pole 72 slot, a 10-pole 90 slot, a 12-pole 108 slot, a 16-pole 144 slot and the like, which are not limited one by one. The utility model discloses in the wire inlet groove of being qualified for the next round of competitions inside all not representing the current direction with the wire outlet groove is inside, only two inslots in order to distinguish every conductor.

Claims (9)

1. A motor stator comprises a stator core (1), wherein a plurality of slots which penetrate through the stator core (1) along the axial direction are formed in the stator core (1), and are distributed along the circumferential direction of the stator core (1); it is characterized by also comprising:

the stator winding (2) comprises a first coil unit and a second coil unit which are sequentially distributed along the radial direction of the stator core (1), each coil unit comprises a plurality of conductors, and each conductor comprises two groove interiors which are used for being inserted into different grooves;

dividing each slot into M layers according to the number of the slots which can be accommodated in the radial direction of the stator core (1), wherein M is an integer which is more than or equal to 3;

the two grooves of each conductor in the first coil unit are positioned in the same layer, and the pitch of the first coil unit is smaller than the pole pitch of the stator winding (2);

the two grooves of each conductor in the second coil unit are positioned in two adjacent layers, and the pitch of the second coil unit is larger than or smaller than the pole pitch of the stator winding (2).

2. The stator according to claim 1, wherein each coil unit comprises a plurality of windings, at least two conductors disposed adjacent to each other form a set of phase conductors, each of the windings comprises three sets of the phase conductors, and two in-slot portions of each of the conductors are an in-slot portion (211) and an out-slot portion (212), respectively; each conductor also comprises an outer groove turning part (214) which is connected to the inner parts of the two grooves and forms a U-shaped structure with the inner parts of the two grooves, and outer groove end parts (213) which are respectively connected to the inner parts of the two grooves; each of the slot outer ends (213) extends substantially in the circumferential direction of the stator core (1).

3. The motor stator according to claim 2, wherein the pitch inside the two slots of each of the conductors in the second coil unit is larger than the pole pitch of the stator winding (2);

when M is an even number, the pitch of the outer end parts of the two slots welded by the conductors is smaller than the pole pitch of the stator winding (2);

when M is an odd number, the pitch of the outer ends of two slots welded by part of the conductors is smaller than the pole pitch of the stator winding (2).

4. The stator according to claim 2, wherein the pitch inside two slots of each of the conductors in the second coil unit is smaller than the pole pitch of the stator winding (2);

when M is an even number, the pitch of the outer end parts of the two slots welded by the conductors is larger than the pole pitch of the stator winding (2);

when M is an odd number, the pitch of the outer ends of two slots welded by part of the conductors is larger than the pole pitch of the stator winding (2).

5. The motor stator according to claim 2, wherein in each group of phase conductors of the first coil unit, the distribution direction of the inside of the wire inlet groove (211) and the inside of the wire outlet groove (212) of each conductor along the circumferential direction of the stator core (1) is opposite to the distribution direction of the inside of the wire inlet groove and the inside of the wire outlet groove of the conductor adjacent thereto along the circumferential direction of the stator core (1); in each phase conductor of the second coil unit, the distribution direction of the inside (211) of a wire inlet groove and the inside (212) of a wire outlet groove of each conductor along the circumferential direction of the stator core (1) is the same.

6. The motor stator according to claim 2, wherein the distribution directions of the outer slot ends (213) located in the same layer along the circumferential direction of the stator core (1) are the same, and the distribution directions of the outer slot ends (213) located in the two adjacent layers along the circumferential direction of the stator core (1) are opposite.

7. The motor stator according to claim 2, further comprising a third coil unit located on a side of the second coil unit remote from the first coil unit;

when M is an odd number, the two inside grooves of each conductor in the third coil unit are positioned at two adjacent layers, and the pitch of the third coil unit is larger than or smaller than the polar distance of the stator winding (2);

and when M is an even number, the two inside grooves of each conductor in the third coil unit are positioned at the same layer, and the pitch of the third coil unit is equal to the pole pitch of the stator winding (2).

8. The electric machine stator of claim 7, wherein the two outboard ends of each conductor are an inlet slot outboard end and an outlet slot outboard end, respectively;

for conductors in the same phase, a plurality of conductors are sequentially connected, the outer end of an outgoing line groove of one conductor in two adjacent conductors in the connecting direction is welded with the outer end of an incoming line groove of the other conductor, the outer end of the outgoing line groove of one conductor is a neutral point of the phase, the outer end of the outgoing line groove of the conductor is positioned in the same radial direction, the outer end of the incoming line groove of the other adjacent conductor is connected with a phase terminal, and except the neutral point and the outer end of the outgoing line groove of the phase terminal, each other outer end (213) of the slots is welded with the outer end (213) of the other conductor which is positioned in the same radial direction, is adjacent to the outer end (213) of the slot and is positioned.

9. An electrical machine comprising an electrical machine stator according to any one of claims 1 to 8.

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