CN117996989A - Stator, motor assembly and vehicle - Google Patents

Abstract

The invention discloses a stator, a motor assembly and a vehicle, wherein the stator comprises: a stator core having S stator slots; a stator winding including a plurality of first coil groups including N first coils including a first slot inner conductor, a first circumferential conductor, and a first connection conductor extending radially along the stator core, and a plurality of second coil groups; the second coil group comprises N second coils, and the second coils comprise second in-slot conductors, second circumferential conductors and second connecting conductors extending along the axial direction of the stator core; n is more than or equal to 3. According to the stator provided by the embodiment of the invention, the ordered wiring of the S-slot stator is realized, the process complexity and the assembly process difficulty in the assembly process are reduced, the production efficiency is improved, and the number of conductors and the arrangement mode of the conductors included in the coil are easy to adjust.

Description

Stator, motor assembly and vehicle

Technical Field

The present disclosure relates to the field of vehicle technology, and more particularly, to a stator, a motor assembly, and a vehicle.

Background

In the related art, most of flat wire winding motors adopt hairpin windings, the working procedures of which comprise hairpin winding forming, twisting and flaring, welding and the like, the technological requirements of each working procedure are very complex, and the structure limits the winding mode of flat wires and is not easy to change the number of layers of the flat wires.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide a stator that can achieve orderly wiring of a stator having S stator slots, and that is simple in assembly process and more flexible in winding.

The invention also provides a motor assembly with the stator.

The invention further provides a vehicle with the motor assembly.

A stator according to an embodiment of the present invention includes: a stator core having S stator slots arranged along a circumferential direction of the stator core; the stator winding comprises a plurality of first coil groups and a plurality of second coil groups which are arranged on the stator core, the plurality of first coil groups and the plurality of second coil groups form a three-phase winding, the plurality of first coil groups are sequentially arranged along the preset sequence of the three-phase winding in the circumferential direction of the stator core, the plurality of second coil groups are sequentially arranged along the preset sequence of the three-phase winding, the first coil groups and the second coil groups corresponding to the same phase winding are alternately arranged along the circumferential direction of the stator core, the first coil groups comprise N first coils, the first coils comprise first groove inner conductors arranged in two stator tooth grooves, first circumferential conductors positioned at two axial ends of the stator core and first connecting conductors connecting the first groove inner conductors and the first circumferential conductors, the first coil groups are provided with first central lines which extend along the axial direction of the stator core, the first coil groups are symmetrically positioned in the same N first groove inner conductors positioned at two sides of the same N first groove inner conductors, and the first connecting conductors are positioned at two sides of the same N continuous groove inner conductors; the second coil group comprises N second coils, each second coil comprises second in-slot conductors arranged in two stator tooth slots, second circumferential conductors positioned at two axial ends of the stator core and second connecting conductors connecting the second in-slot conductors and the second circumferential conductors, each second connecting conductor extends along the axial direction of the stator core, each second coil group is provided with a second central line extending along the axial direction of the stator core, the two second in-slot conductors of each second coil are symmetrically positioned at two sides of the second central line, and N second in-slot conductors positioned at the same side of the second central line of the same second coil group are arranged in the continuous N stator tooth slots; n is more than or equal to 3.

According to the stator provided by the embodiment of the invention, the first coil group and the second coil group are arranged, the first coil group comprises N first coils, the second coil group comprises N second coils, N is more than or equal to 3, ordered wiring of the stator with S stator tooth grooves can be realized, the stator winding is mounted to the stator core, the processes of twisting heads, flaring and the like of the hairpin winding are omitted, the complexity of the process is greatly reduced, the difficulty of the assembly process is reduced, the production efficiency is improved, the orderly arrangement of conductors of the coils is facilitated, and the qualification rate and the stator performance are facilitated to be improved. And the number of conductors and the arrangement mode of the conductors included in the coil are easy to adjust, so that the application requirements of different motors can be met conveniently.

In addition, the stator according to the above embodiment of the present invention may have the following additional technical features:

According to some embodiments of the invention, S is 72, n is 3, the stator winding comprises 6 first coil groups and 6 second coil groups, the number of stator slots spanned by three first coils of a same first coil group is 7, 9 and 11, respectively, and the number of stator slots spanned by three second coils of a same second coil group is 7, 9 and 11, respectively.

According to some embodiments of the invention, the first in-slot conductor and/or the second in-slot conductor comprises M conductors, M conductors are arranged along the radial direction of the stator core, M is equal to or less than 4 and is equal to or less than 16, a cross section of the conductors perpendicular to the axial direction of the stator core comprises two first straight edges and two second straight edges, the two first straight edges are spaced along the circumferential direction of the stator core, the two second straight edges are spaced along the radial direction of the stator core, and the length of the first straight edges is smaller than that of the second straight edges.

According to some embodiments of the invention, a slot insulator is disposed in the stator slot, the slot insulator extending in an axial direction of the stator core and surrounding the first or second in-slot conductor in the stator slot.

According to some embodiments of the invention, the slot insulator comprises a slot bottom cover and a slot top cover, the slot bottom cover comprises a first bottom wall and two first side walls connected with two sides of the first bottom wall, the first side walls extend along the radial direction of the stator core and the two first side walls are spaced along the circumferential direction of the stator core; the slot top cover comprises a second bottom wall and two second side walls connected with two sides of the second bottom wall, the second side walls extend along the radial direction of the stator core, and the two second side walls are spaced along the circumferential direction of the stator core; the first side wall overlaps the second side wall of the corresponding side.

According to some embodiments of the invention, the first side wall has a greater extension in the radial direction of the stator core than the second side wall.

According to some embodiments of the invention, the first sidewall and the second sidewall are press fit.

According to some embodiments of the invention, the two first side walls are located on sides of the two second side walls away from each other in a circumferential direction of the stator core, the stator tooth slot has a slot bottom surface and two slot side surfaces spaced apart in the circumferential direction of the stator core, at least one of the slot side surfaces is provided with a groove near an end of the slot bottom surface, and at least a portion of the first side wall is located in the groove.

According to some embodiments of the invention, the depth of the groove along the circumferential direction of the stator core is 0.25mm to 0.50mm.

According to some embodiments of the invention, the plurality of first coil groups and the plurality of second coil groups corresponding to the same phase winding form a plurality of parallel branches, and the branches are connected in series with the N first coils of one of the first coil groups, or connected in series with the N second coils of one of the second coil groups, or connected in series with the N first coils of at least one of the first coil groups and the N second coils of at least one of the second coil groups.

According to some embodiments of the invention, the stator core comprises an annular stator yoke and S stator teeth, S stator teeth are distributed along the circumferential direction of the stator yoke, the stator tooth slots are formed between two adjacent stator teeth, the first circumferential conductor is located axially outside the stator yoke, the second circumferential conductor is located axially outside the stator teeth, and in the axial direction of the stator core, the second circumferential conductor is located at one side of the first circumferential conductor away from the stator core.

According to some embodiments of the invention, the first coil and the second coil are preformed coils.

An electric motor assembly according to an embodiment of the invention comprises a stator according to an embodiment of the invention.

A vehicle according to an embodiment of the invention includes a motor assembly according to an embodiment of the invention.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is an axial view of a stator according to an embodiment of the present invention;

Fig. 2 is a schematic structural view of a stator core and a first coil group according to an embodiment of the present invention;

FIG. 3 is a perspective view of FIG. 2;

Fig. 4 is a front view of a stator core and a first coil group according to an embodiment of the present invention;

fig. 5 is an axial view of a stator winding according to an embodiment of the invention;

Fig. 6 is a front view of a stator winding according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a stator winding according to an embodiment of the present invention;

Fig. 8 is a schematic diagram of an arrangement of the same corresponding first coil group and second coil group according to an embodiment of the present invention;

FIG. 9 is a perspective view of FIG. 8;

fig. 10 is a schematic structural view of a first coil group of a stator according to an embodiment of the present invention;

FIG. 11 is an exploded view of FIG. 10;

fig. 12 is a schematic structural view of a second coil group of a stator according to an embodiment of the present invention;

Fig. 13 is a partially enlarged structural schematic view of a stator according to an embodiment of the present invention;

FIG. 14 is a schematic diagram of a circuit of the same phase winding according to some embodiments of the invention;

Fig. 15 is a schematic circuit diagram of the same phase winding according to further embodiments of the present invention;

fig. 16 is a schematic view of a vehicle according to an embodiment of the invention.

Reference numerals:

A stator 100; a motor assembly 200; a vehicle 300;

A stator core 10; stator tooth slots 101; a groove 102; a groove bottom surface 103; a slot side 104; stator teeth 11; a stator yoke 12;

a stator winding 20; a conductor 21; a first straight edge 211; a second straight edge 212;

A first coil group 30; a first coil 31; a first in-slot conductor 32; a first circumferential conductor 33; a first connection conductor 34;

a second coil group 40; a second coil 41; a second in-slot conductor 42; a second circumferential conductor 43; a second connection conductor 44;

A slot insulator 50; a slot bottom cover 51; a first bottom wall 511; a first sidewall 512; a tank cover 52; a second bottom wall 521; a second sidewall 522.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

In the description of the invention, "a first feature" may include one or more such features, and "a plurality" may mean two or more, and that a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, or may include both the first and second features not being in direct contact but being in contact with each other through additional features therebetween, with the first feature "above", "over" and "above" the second feature including both the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature.

A stator 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

Referring to fig. 1 to 13, a stator 100 according to an embodiment of the present invention may include: a stator core 10 and stator windings 20.

Specifically, the stator core 10 has S stator slots 101, and the S stator slots 101 are arranged along the circumferential direction of the stator core 10. For example, the stator core 10 includes a stator yoke 12 and stator teeth 11, wherein the stator yoke 12 is ring-shaped, the stator teeth 11 are S, the S stator teeth 11 are distributed along a circumferential direction of the stator yoke 12 and are provided on an inner circumferential surface of the stator yoke 12 for an inner rotor motor, in other words, the stator teeth 11 are connected with the inner circumferential surface of the stator yoke 12 along a radially outer end of the stator core 10, and the inner ends of the S stator teeth 11 may define a stator hole coaxial with the stator yoke 12. Or S stator teeth 11 are provided on the outer circumferential surface of the stator yoke 12 for the outer rotor motor, in other words, the inner ends of the stator teeth 11 in the radial direction of the stator core 10 are connected to the outer circumferential surface of the stator yoke 12. Stator tooth slots 101 are formed between two adjacent stator tooth portions 11.

The stator yoke 12 can provide mechanical support for the S stator teeth 11, fixing the stator teeth 11 in position. In some embodiments, the stator teeth 11 may be integrally formed with the stator yoke 12.

The specific structure of the stator 100 will be described below taking an example in which the stator tooth 11 is provided on the inner peripheral surface of the stator yoke 12, and an embodiment in which the stator tooth 11 is provided on the outer peripheral surface of the stator yoke 12 will be understood by those skilled in the art from the following description.

Referring to fig. 2 to 9, the stator winding 20 includes a plurality of first coil groups 30 and a plurality of second coil groups 40 mounted on the stator core 10, and the plurality of first coil groups 30 and the plurality of second coil groups 40 constitute a three-phase winding.

Wherein, in the circumferential direction of the stator core 10, all the first coil groups 30 are sequentially arranged along the circumferential direction of the stator core 10 according to the preset sequence of the three-phase windings, all the second coil groups 40 are sequentially arranged along the circumferential direction of the stator core 10 according to the preset sequence of the three-phase windings, and the first coil groups 30 and the second coil groups 40 corresponding to the same-phase windings are alternately arranged along the circumferential direction of the stator core 10. Also, the first coil group 30 may include N first coils 31, and the second coil group 40 includes N second coils 41, N.gtoreq.3.

For example, as shown in fig. 2 to 9, the stator core 1 has 72 stator slots 101, i.e., s=72, and the stator winding 20 includes a-phase, B-phase, and C-phase three-phase windings, each phase including two first coil groups 30 and two second coil groups 40. Wherein the six first coil groups 30 are sequentially arranged in the order of a phase, B phase, C phase, a phase, B phase and C phase, the six second coil groups 40 are sequentially arranged in the order of a phase, B phase, C phase, a phase, B phase and C phase, the first coil groups 30 each include three first coils 31 concentrically arranged, and the second coil groups 40 include three second coils 41 concentrically arranged, i.e., n=3. The first coil groups 30 and the second coil groups 40 corresponding to the same phase winding are alternately arranged, i.e., sequentially arranged in the order of the first coil groups 30, the second coil groups 40, the first coil groups 30, the second coil groups 40.

Each coil (first coil 31 and second coil 41) includes two in-slot conductors located in the stator slot 101, two circumferential conductors located at both axial ends of the stator core 10, and four connecting conductors connecting the in-slot conductors and the circumferential conductors so that the entire coil is formed in a ring shape. Specifically, the first coil 31 includes two first in-slot conductors 32, two first circumferential conductors 33, and four first connection conductors 34, and the second coil 41 includes two second in-slot conductors 42, two second circumferential conductors 43, and four second connection conductors 44.

The number of stator slots 101 spanned by two in-slot conductors corresponding to the same coil, i.e., the number difference of the stator slots 101 in which the two in-slot conductors are located, is the pitch (or span) of the coil. Specifically, the stator core 10 has S stator slots 101 in total, and is numbered sequentially in the circumferential direction of the stator core 10 according to the order of No. 1, no. 2, no. 3, … …, no. S-1, no. S, one of the in-slot conductors of a certain coil is located in the No. 1 stator slot 101, the other in-slot conductor is located in the No. 8 stator slot 101, and the coil spans 7 stator slots 101 with a pitch of 7; one of the in-slot conductors of a certain coil is positioned in the S-shaped stator slot 101, and the other in-slot conductor is positioned in the 9-shaped stator slot 101, so that the coil spans 9 stator slots 101 and has a pitch of 9.

Wherein the first coil assembly 30 has a first center line extending along an axial direction of the stator core 10, and two first slot conductors 32 of the first coil 31 are symmetrically located at both sides of the first center line. And N first slot conductors 32 located on the same side of the first center line among N first coils 31 corresponding to the same first coil group 30 are disposed in N stator tooth slots 101 in succession, so that the N first coils 31 form a concentrically arranged structure. Here, the "continuous N stator slots 101" means that the N stator slots 101 are sequentially arranged in the circumferential direction of the stator core 10, and any two continuous stator slots 101 are separated by one stator tooth portion 11.

For example, the number of stator slots 101 spanned by three first coils 31 corresponding to the same first coil group 30 may be 7, 9, and 11, respectively. That is, the first coil 31 located at the innermost ring has a pitch of 7 (short pitch, e.g., two first in-slot conductors 32 are located in stator slots 101 No. 15 and No. 22, respectively), the first coil 31 located at the outermost ring has a pitch of 11 (long pitch, e.g., two first in-slot conductors 32 are located in stator slots 101 No. 13 and No. 24, respectively), and the first coil 31 located in the middle has a pitch of 9 (full pitch, e.g., two first in-slot conductors 32 are located in stator slots 101 No. 14 and No. 23, respectively). Of the three first coils 31 corresponding to the same first coil group 30, three first in-slot conductors 31 located in the No. 13, no. 14, and No. 15 stator slots 101 are located on one side of the first center line of the first coil group 30, and three first in-slot conductors 31 located in the No. 22, no. 23, and No. 24 stator slots 101 are located on the other side of the first center line of the first coil group 30.

Wherein the second coil group 40 has a second center line extending along the axial direction of the stator core 10, and two second slot conductors 42 of the second coil 41 are symmetrically located at both sides of the second center line. And N second slot conductors 42 located on the same side of the second center line among N second coils 41 corresponding to the same second coil group 40 are disposed in the N continuous stator tooth slots 101, so that the N second coils 41 form a concentrically arranged structure.

For example, the number of stator slots 101 spanned by three second coils 41 corresponding to the same second coil group 40 may be 7,9, and 11, respectively. That is, the second coil 41 located at the innermost ring has a pitch of 7 (short pitch, e.g., two second in-slot conductors 42 are located in stator slots 101 No. 21 and 28, respectively), the second coil 41 located at the outermost ring has a pitch of 11 (long pitch, e.g., two second in-slot conductors 42 are located in stator slots 101 No. 19 and 30, respectively), and the second coil 41 located in the middle has a pitch of 9 (full pitch, e.g., two second in-slot conductors 42 are located in stator slots 101 No. 20 and 29, respectively). Of the three second coils 41 corresponding to the same second coil group 40, the three second in-slot conductors 41 located in the No. 19, no. 20, and No. 21 stator slots 101 are located on one side of the second center line of the second coil group 40, and the three second in-slot conductors 41 located in the No. 28, no. 29, and No. 304 stator slots 101 are located on the other side of the second center line of the second coil group 40.

And among N coils which correspond to the same coil group and are concentrically arranged, the pitch difference value of any two adjacent coils is 2, and a slot conductor is arranged in the stator tooth slot 101, so that the installation of a plurality of coils on the stator core 10 is ensured not to interfere with each other, and the coil damage is avoided.

In addition, the first coil assembly 30 and the second coil assembly 40 are different in structure, and the assembly requirement of the stator winding 20 can be met by arranging the first coil assembly 30 and the second coil assembly 40 with two different structures, so that the applicability of the first coil assembly 30 and the second coil assembly 40 is strong, the number of coil types is small, the difficulty in manufacturing coils is reduced, and the production efficiency is improved.

Specifically, as shown in fig. 2 to 12, the first connection conductor 34 of the first coil 31 extends in the radial direction of the stator core 10. When winding the first coil 31, the conductor 21 included in the first in-slot conductor 32 may be bent outward in the radial direction of the stator core 10, then bent in the circumferential direction of the stator core 10, and then bent inward in the radial direction of the stator core 10, to wind a layer of the conductor 21 located outside the stator slot 101. In the whole winding process, the first groove inner conductor 32, the first connecting conductor 34 and the first circumferential conductor 33 can be obtained through bending and winding one wire, so that the procedures of twisting, flaring and the like of the hairpin winding are omitted, the complexity of the procedure process is greatly reduced, the manufacturing efficiency is improved, the conductors 21 are orderly arranged, and the qualification rate and the performance of the stator 100 can be remarkably improved.

As shown in fig. 2 to 12, the second connection conductor 44 of the second coil 41 extends in the axial direction of the stator core 10. When winding the second coil 41, the conductor 21 included in the second in-slot conductor 42 may be extended outwardly in the axial direction of the stator core 10, then bent in the circumferential direction of the stator core 10, and then extended inwardly in the axial direction of the stator core 10 to wind a layer of the conductor 21 located outside the stator slot 101. In the whole winding process, the second groove inner conductor 42, the second connecting conductor 44 and the second circumferential conductor 43 can be obtained through bending and winding of one wire, so that the procedures of twisting, flaring and the like of the hairpin winding are omitted, the complexity of the procedure process is greatly reduced, the manufacturing efficiency is improved, the conductors 21 are orderly arranged, and the qualification rate and the performance of the stator 100 can be remarkably improved.

In some embodiments, the first coil 31 and the second coil 41 may be prefabricated coils, and the stator core 10 is assembled after the prefabrication, the winding process of the first coil 31 and the second coil 41 is not limited by the smaller space of the stator core 10, and the position arrangement and the bending direction of the conductors 21 included in the coils in the winding process are easy to control, so that the winding efficiency and the qualification rate are improved, and the requirement of changing the number of conductors of different stators 100 is met.

According to the stator 100 of the embodiment of the invention, by arranging the coil groups of the first coil group 30 and the second coil group 40, wherein the first coil group 30 comprises N first coils 31, the second coil group 40 comprises N second coils 41, the ordered wiring of the stator 100 with S stator tooth slots 101 can be realized, and the process of mounting the stator winding 20 to the stator core 10 is omitted, the procedures of twisting heads, flaring and the like of the hairpin winding are omitted, the complexity of the procedure process is greatly reduced, the difficulty of the assembly process is reduced, the production efficiency is improved, the ordered arrangement of the conductors 21 of the coils is facilitated, and the qualification rate and the performance of the stator 100 are facilitated. And the number of conductors and the arrangement mode of the conductors 21 included in the coil are easy to adjust, so that the application requirements of different motors can be met conveniently.

According to some embodiments of the present invention, as shown in fig. 1 and 13, the first in-slot conductor 32 includes M conductors 21, and the M conductors 21 are arranged in the radial direction of the stator core 10. In other words, the first in-slot conductor 32 includes M layers of conductors 21 arranged in the radial direction of the stator core 10, each layer including one conductor 21. The electric field intensity between the conductors 21 in the stator tooth slots 101 is reduced, and the slot filling rate is improved, so that the overall performance of the stator 100 is improved.

According to some embodiments of the present invention, as shown in fig. 1 and 13, the second in-slot conductor 42 may include M conductors 21, and the M conductors 21 are arranged in the radial direction of the stator core 10.

In addition, M is more than or equal to 4 and less than or equal to 16. Too few conductors included in the in-slot conductors (either the first in-slot conductor 32 or the second in-slot conductor 42) can result in poor motor performance; an excessive number of conductors included in the slot may result in an excessive volume of the stator 100. In the range of the value, the double requirements of good motor performance and smaller volume of the stator 100 are considered.

In some embodiments, the plurality of conductors 21 of the same coil (the first coil 31 and the second coil 41) may be wound by one wire, which is advantageous to simplify the production process and improve the production efficiency.

In some embodiments in which the plurality of conductors 21 included in the same in-slot conductor are arranged in the radial direction of the stator core 10, as shown in fig. 13, a cross section of the conductor 21 perpendicular to the axial direction of the stator core 10 includes two first straight sides 211 and two second straight sides 212, the two first straight sides 211 are spaced apart in the circumferential direction of the stator core 10, the two second straight sides 212 are spaced apart in the radial direction of the stator core, and the length of the first straight sides 211 is smaller than the length of the second straight sides 212. That is, the conductors 21 are of a flat wire structure, and the plurality of conductors 21 are arranged in the thickness direction of the flat wire so that the plurality of conductors 21 are arranged more orderly and stably.

According to some embodiments of the present invention, as shown in fig. 13, a slot insulator 50 is provided in a stator slot 101, the slot insulator 50 extends in an axial direction of a stator core 10, and the slot insulator 50 surrounds a first slot conductor 32 or a second slot conductor 42 located in the stator slot 101 to achieve an insulation effect with the stator core 10 through the slot insulator 50.

In some embodiments, with continued reference to fig. 13, the slot insulator 50 includes a slot bottom cover 51 and a slot top cover 52, the slot bottom cover 51 and the slot top cover 52 snap together to form the slot insulator 50. The split slot bottom cover 51 and slot top cover 52 facilitate the installation of the slot insulator 50 within the stator slot 101 and also facilitate the assembly of the slot insulator 50 with the in-slot conductor. For example, at the time of assembly, the slot bottom cover 51 may be inserted into the stator slot 101 in the axial direction of the stator core 10 first; then the in-slot conductors of the coil are fitted into the stator tooth slots 101 and are opposed to the slot bottom cover 51; finally, the slot top cover 52 is installed in the stator slot 101 and buckled with the slot bottom cover 51 to wrap the conductor in the slot, thereby realizing insulation.

In some embodiments, as shown in fig. 13, the slot bottom cover 51 includes a first bottom wall 511 and two first side walls 512, the two first side walls 512 are connected to both sides of the first bottom wall 511, the first side walls 512 extend in the radial direction of the stator core 10, and the two first side walls 512 are spaced apart in the circumferential direction of the stator core 10. So that the slot bottom cover 51 forms a U-shaped structure with its opening facing the slot opening of the stator slot 101.

The slot top cover 52 includes a second bottom wall 521 and two second side walls 522, the two second side walls 522 being connected to both sides of the second bottom wall 521, respectively, the second side walls 522 extending in the radial direction of the stator core 10, and the two second side walls 522 being spaced apart in the circumferential direction of the stator core 10. So that the slot top cover 52 forms a U-shaped structure with its opening toward the slot bottom 103 of the stator slot 101.

The first side wall 512 and the second side wall 522 on the corresponding side overlap each other, so that the groove bottom cover 51 and the groove top cover 52 are engaged with each other to form a frame structure, thereby surrounding the conductor in the groove. The overlap joint cooperation mode also avoids the gap to influence the insulation effect.

In addition, the frame-shaped structure of the slot insulator 50 more closely matches the arrangement of the plurality of conductors 21 of the in-slot conductor. For example, in the embodiment in which the in-slot conductor includes a plurality of conductors 21 arranged radially along the stator core 10, the cross section of the in-slot conductor perpendicular to the axial direction is substantially rectangular, and the frame-shaped structure of the slot insulator 50 is more adapted to the rectangular structure of the in-slot conductor to enhance the limit effect on the in-slot conductor, which is advantageous for enhancing the slot filling rate.

In some embodiments, first sidewall 512 and second sidewall 522 are press fit. For example, two first side walls 512 clamp two second side walls 522, or two second side walls 522 clamp two first side walls 512, to ensure that the slot bottom cover 51 and the slot top cover 52 fit securely, preventing the slot top cover 52 from falling off.

In some embodiments, as shown in fig. 13, in the circumferential direction of the stator core 10, the two first side walls 512 are located on sides of the two second side walls 522 away from each other, respectively, that is, the pitch of the two first side walls 512 is greater than the pitch of the two second side walls 522. And the stator slot 101 has a slot bottom surface 103 and two slot side surfaces 104 spaced apart in the circumferential direction of the stator core 10, at least one of the slot side surfaces 104 being provided with a groove 102 at an end portion near the slot bottom surface 103, at least a portion of the first side wall 512 being located within the groove 102. For example, the stator tooth slot 101 may be formed in two sections having different slot widths, wherein the wider section is located on the side of the narrower section near the slot bottom 103, such that the wider section is formed as a recess 102 in the narrower section, i.e., a space is reserved in the area of the stator tooth 11 near the slot bottom 103 for receiving the first sidewall 512.

One of the walls of the recess 102 may be located on a side of the corresponding first side wall 512 remote from the recess floor 103. So that the groove 102 can limit the first side wall 512, prevent the slot bottom cover 51 from falling off due to the radial movement of the slot bottom cover 51 to the outside of the stator tooth slot 101, and ensure the installation reliability.

In some embodiments, the depth L of the groove 102 along the circumferential direction of the stator core 10 may be 0.25mm to 0.50mm, for example, in some embodiments L may be 0.25mm, 0.3mm, 0.4mm, 0.5mm, etc. Within the above-mentioned size range, the depth of the groove 102 is large enough to ensure a large enough limiting area with the first sidewall 512, and ensure the reliability of limiting; and the waste of the effective area of the stator core 10 caused by the overlarge depth of the grooves 102 is avoided, and the too small slot filling rate caused by the overlarge cross-sectional area of the stator tooth slots 101 is avoided.

In some embodiments, as shown in fig. 13, the extension length of the first sidewall 512 in the radial direction of the stator core 10 is greater than the extension length of the second sidewall 522 in the radial direction of the stator core 10. So that the second side wall 522 has a larger size, thereby improving the stability of the second side wall 522 in the stator tooth slot 101, and the slot top cover 52 is not easy to fall off. For example, the anti-slip effect may be provided by friction between the second sidewall 522 and the slot side 104 of the stator slot 101.

Also, in the embodiment provided with the groove 102, the longer the length of the second sidewall 522, the smaller the width of the groove 102 along the radial direction of the stator core 10, and the smaller the space required for reserving the area of the stator tooth 11 near the bottom surface 103 of the groove, thereby increasing the area of the stator core 10, which is beneficial to improving the performance of the stator 100.

In some embodiments of the present invention, as shown in fig. 14 and 15, the plurality of first coil groups 30 and the plurality of second coil groups 40 corresponding to the same phase winding form a plurality of parallel branches, and the branches are connected in series with the N first coils 31 of one of the first coil groups 30, or the N second coils 41 of one of the second coil groups 40, or the N first coils 31 of at least one of the first coil groups 30 and the N second coils 41 of at least one of the second coil groups 40.

Therefore, each branch forms a non-whole-circle arrangement structure, more parallel branches are formed, application requirements of low-voltage working conditions are met, and resistance differences among the coils can be balanced through connecting the coils in series with the same first coil group 30 or the same second coil group 40, so that performance of the stator 100 is improved.

For example, each phase winding includes two first coil groups 30 (denoted as 1# first coil group 30 and 2# first coil group 30) and two second coil groups 40 (denoted as 1# second coil group 40 and 2# second coil group 40), which are arranged in the order of 1# first coil group 30, 1# second coil group 40, 2# first coil group 30, 2# second coil group 40 along the circumferential direction of the stator core 10.

As shown in fig. 14, each phase winding constitutes two branches in parallel. One of the branches is connected in series with the 11# first coil 31, the 12# first coil 31, and the 13# first coil 31 of the 1# first coil group 30, and the 11# second coil 41, the 12# second coil 41, and the 13# second coil 41 of the 1# second coil group 40; wherein the other branch is connected in series with the 21# first coil 31, the 22# first coil 31, and the 23# first coil 31 of the 2# first coil group 30, and the 21# second coil 41, the 22# second coil 41, and the 23# second coil 41 of the 2# second coil group 40.

As shown in fig. 15, each phase winding constitutes four branches in parallel. The first branch is connected in series with the 11# first coil 31, the 12# first coil 31, and the 13# first coil 31 of the 1# first coil group 30; the second branch is connected in series with the 21# first coil 31, the 22# first coil 31, and the 23# first coil 31 of the 2# first coil group 30; the third branch is connected in series with the 11# second coil 41, the 12# second coil 41, and the 13# second coil 41 of the 1# second coil group 40; the fourth branch is connected in series with the 21# second coil 41, the 22# second coil 41, and the 23# second coil 41 of the 2# second coil group 40.

According to some embodiments of the present invention, as shown in fig. 1 to 9, the stator core 10 includes an annular stator yoke 12 and S stator teeth 11, the S stator teeth 11 being distributed along a circumferential direction of the stator yoke 12, and a stator slot 101 being formed between adjacent two stator teeth 11.

In some embodiments, as shown in fig. 2-7, the first circumferential conductor 33 is located axially outward of the stator yoke 12 and the second circumferential conductor 43 is located axially outward of the stator teeth 11. In other words, the projection of the first circumferential conductor 33 in the axial direction of the stator core 10 falls within the projection range of the stator yoke 12, and the projection of the second circumferential conductor 43 in the axial direction of the stator core 10 is located in the region between the stator yoke 12 and the stator hole. Thereby, the first circumferential conductors 33 of the first coils 31 and the second circumferential conductors 43 of the second coils 41 are arranged in a staggered manner along the radial direction of the stator core 10, the arrangement requirements of the first coil groups 30 and the second coil groups 40 arranged in a staggered manner along the circumferential direction are satisfied, interference is avoided, and the installation is convenient.

In some embodiments, as shown in fig. 2-7, the second circumferential conductor 43 is located on a side of the first circumferential conductor 33 that is remote from the stator core 10 in the axial direction of the stator core 10. So that the first circumferential conductor 33 and the second circumferential conductor 43 are staggered in the axial direction of the stator core 10, thereby meeting the arrangement requirement of the first coil group 30 and the second coil group 40 which are staggered in the circumferential direction and avoiding interference.

In the assembling process, the first coils 31 of the plurality of first coil groups 30 may be first installed into the corresponding stator slots 101, so that two first circumferential conductors 33 of the first coils 31 are respectively located at two axial sides of the stator yoke 12; then, the second coils 41 of the plurality of second coil groups 40 are installed in the corresponding stator tooth slots 101, so that the two second circumferential conductors 43 of the second coils 41 are respectively located at two axial sides of the stator tooth 11, and the second circumferential conductors 43 are located at the outer side (i.e. the side far away from the stator core 10) of the first connecting conductor 34 of the first coil 31, and the assembly of the first coil group 30 does not affect the assembly of the second coil group 40, so that the structural design and arrangement are reasonable and ordered.

According to some embodiments of the present invention, as shown in fig. 2 to 12, in the same first coil group 30, N first circumferential conductors 33 of N first coils 31 located at the same end of the stator core 10 in the axial direction are sequentially arranged along the radial direction of the stator core 10, so that on one hand, the N first circumferential conductors 33 in the same first coil group 30 do not interfere with each other, on the other hand, the size of the stator winding 20 along the axial direction of the stator core 10 can be effectively reduced, the axial occupied space is reduced, and the miniaturization of the motor is facilitated.

According to some embodiments of the present invention, as shown in fig. 14 to 15, in the same second coil group 40, N second circumferential conductors 43 of N second coils 41 located at the same end in the axial direction of the stator core 10 are sequentially arranged in the axial direction of the stator core 10, so that N second circumferential conductors 43 in the same second coil group 40 do not interfere with each other, and the number of conductors arranged in the radial direction of the stator core 10 included in the second circumferential conductors 43 can be more flexible.

According to some embodiments of the present invention, the number S of slots of the stator tooth slots 101 is 72, the corresponding pole pair number of the stator 100 is 8, and the number N of coils included in the coil set is 3, so that the stator 100 better meets the application requirement of the driving motor of the automobile.

According to some embodiments of the invention, the outgoing lines of each phase winding are connected to form a lead portion, and the neutral points of the three phase windings are connected to form a neutral point portion, thereby enabling parallel connection of the multiple branches in embodiments where each phase winding includes multiple branches.

In some embodiments, the three-phase windings are connected together using a common-neutral wye connection, i.e., a star connection, and in particular, the neutral portions of the three-phase windings. In other embodiments, the three-phase windings are connected by delta connection, specifically, any two-phase windings in the three-phase windings are connected by a lead portion and a neutral point portion. Among them, the star connection is more beneficial to reducing eddy current loss and improving the performance of the stator 100.

In some embodiments, the outgoing line and the neutral point of the stator winding 20 are located at two axial ends of the stator core 10, respectively, that is, the outgoing line and the neutral point are located at different ends, so that an error in connection between the outgoing line and the neutral point is avoided, the wiring space is also made larger, and wiring is made simpler.

As shown in fig. 16, the motor assembly 200 according to the embodiment of the present invention includes the stator 100 according to the embodiment of the present invention. Since the stator 100 according to the embodiment of the present invention has the above-mentioned beneficial technical effects, according to the motor assembly 200 of the embodiment of the present invention, by providing the coil sets of the two structures of the first coil set 30 and the second coil set 40, and the first coil set 30 includes N first coils 31, and the second coil set 40 includes N second coils 41, N is greater than or equal to 3, the orderly wiring of the stator 100 having S stator slots 101 can be achieved, and the process of mounting the stator winding 20 to the stator core 10, the procedures of twisting the hairpin winding, flaring, etc. are omitted, the complexity of the procedure process is greatly reduced, the difficulty of the assembly process is reduced, the production efficiency is improved, and the orderly arrangement of the conductors 21 of the coils is facilitated, and the qualification rate and the performance of the stator 100 are facilitated to be improved. And the number of conductors and the arrangement mode of the conductors 21 included in the coil are easy to adjust, so that the application requirements of different motors can be met conveniently.

As shown in fig. 16, a vehicle 300 according to an embodiment of the present invention includes a motor assembly 200 according to an embodiment of the present invention. Since the motor assembly 200 according to the embodiment of the present invention has the above-described advantageous technical effects, according to the vehicle 300 of the embodiment of the present invention, by providing the coil sets of the two structures of the first coil set 30 and the second coil set 40, and the first coil set 30 includes N first coils 31, and the second coil set 40 includes N second coils 41, N is greater than or equal to 3, orderly wiring of the stator 100 having S stator slots 101 can be achieved, and the process of mounting the stator winding 20 to the stator core 10, procedures such as twisting and flaring of the hairpin winding are omitted, complexity of procedure and process is greatly reduced, difficulty of assembly process is reduced, production efficiency is improved, orderly arrangement of the conductors 21 of the coils is facilitated, and improvement of qualification rate and performance of the stator 100 is facilitated. And the number of conductors and the arrangement mode of the conductors 21 included in the coil are easy to adjust, so that the application requirements of different motors can be met conveniently.

Here, the vehicle 300 may be a new energy vehicle, which may be a pure electric vehicle having the motor assembly 200 as a main driving force in some embodiments, and may be a hybrid vehicle having both the internal combustion engine and the motor assembly 200 as main driving forces in other embodiments. Regarding the internal combustion engine and the motor assembly 200 for supplying driving power to the new energy vehicle mentioned in the above embodiments, the internal combustion engine may use gasoline, diesel oil, hydrogen gas, or the like as fuel, and the manner of supplying electric power to the motor assembly 200 may use a power battery, a hydrogen fuel cell, or the like, without being particularly limited thereto. The present invention is not limited to the above-described embodiments, and may be applied to any other embodiments.

Other configurations and operations of the vehicle 300 and the motor assembly 200 according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the description herein, reference to the terms "embodiment," "specific embodiment," "example," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (14)

1. A stator, comprising:

A stator core having S stator slots arranged along a circumferential direction of the stator core;

A stator winding including a plurality of first coil groups and a plurality of second coil groups mounted on the stator core, the plurality of first coil groups and the plurality of second coil groups constituting a three-phase winding, the plurality of first coil groups being sequentially arranged along a preset sequence of the three-phase winding in a circumferential direction of the stator core, the plurality of second coil groups being sequentially arranged along a preset sequence of the three-phase winding, and the first coil groups and the second coil groups corresponding to the same phase winding being alternately arranged along the circumferential direction of the stator core,

The first coil group comprises N first coils, each first coil comprises first slot conductors arranged in two stator tooth slots, first circumferential conductors positioned at two axial ends of the stator core and first connecting conductors connecting the first slot conductors and the first circumferential conductors, each first connecting conductor extends along the radial direction of the stator core, each first coil group is provided with a first central line extending along the axial direction of the stator core, the two first slot conductors of each first coil are symmetrically positioned at two sides of the first central line, and N first slot conductors positioned at the same side of the first central line of the same first coil group are arranged in the continuous N stator tooth slots;

the second coil group comprises N second coils, each second coil comprises second in-slot conductors arranged in two stator tooth slots, second circumferential conductors positioned at two axial ends of the stator core and second connecting conductors connecting the second in-slot conductors and the second circumferential conductors, each second connecting conductor extends along the axial direction of the stator core, each second coil group is provided with a second central line extending along the axial direction of the stator core, the two second in-slot conductors of each second coil are symmetrically positioned at two sides of the second central line, and N second in-slot conductors positioned at the same side of the second central line of the same second coil group are arranged in the continuous N stator tooth slots; n is more than or equal to 3.

2. The stator of claim 1, wherein S is 72 and n is 3, the stator winding includes 6 first coil groups and 6 second coil groups, the number of stator slots spanned by three first coils of a same first coil group is 7, 9, and 11, respectively, and the number of stator slots spanned by three second coils of a same second coil group is 7, 9, and 11, respectively.

3. The stator according to claim 1, wherein the first in-slot conductor and/or the second in-slot conductor includes M conductors, M conductors are arranged along a radial direction of the stator core, and M is equal to or less than 4 and equal to or less than 16, a cross section of the conductors perpendicular to an axial direction of the stator core includes two first straight sides and two second straight sides, the two first straight sides are spaced apart along a circumferential direction of the stator core, the two second straight sides are spaced apart along the radial direction of the stator core, and a length of the first straight sides is smaller than a length of the second straight sides.

4. The stator of claim 1, wherein slot insulators are disposed within the stator slots, the slot insulators extending in an axial direction of the stator core and surrounding the first or second in-slot conductors within the stator slots.

5. The stator of claim 4, wherein the slot insulator comprises a slot bottom cover and a slot top cover, the slot bottom cover comprising a first bottom wall and two first side walls connected to both sides of the first bottom wall, the first side walls extending in a radial direction of the stator core and the two first side walls being spaced apart in a circumferential direction of the stator core;

The slot top cover comprises a second bottom wall and two second side walls connected with two sides of the second bottom wall, the second side walls extend along the radial direction of the stator core, and the two second side walls are spaced along the circumferential direction of the stator core;

The first side wall overlaps the second side wall of the corresponding side.

6. The stator of claim 5, wherein an extension of the first sidewall in a radial direction of the stator core is greater than an extension of the second sidewall in the radial direction of the stator core.

7. The stator of claim 5, wherein the first sidewall and the second sidewall are press fit.

8. The stator of claim 5, wherein two of said first side walls are located on respective sides of two of said second side walls that are away from each other in a circumferential direction of said stator core, said stator tooth slot having a slot bottom surface and two slot side surfaces that are circumferentially spaced apart along said stator core, at least one of said slot side surfaces being provided with a groove at an end portion thereof that is adjacent to said slot bottom surface, at least a portion of said first side wall being located within said groove.

9. The stator of claim 8, wherein the depth of the groove along the circumferential direction of the stator core is 0.25mm to 0.50mm.

10. The stator according to claim 1, wherein a plurality of said first coil groups and a plurality of said second coil groups corresponding to the same phase winding constitute a plurality of parallel branches, said branches being connected in series with N of said first coils of one of said first coil groups, or with N of said second coils of one of said second coil groups, or with N of said first coils of at least one of said first coil groups and N of said second coils of at least one of said second coil groups.

11. The stator according to claim 1, wherein the stator core includes an annular stator yoke and S stator teeth, S stator teeth are distributed along a circumferential direction of the stator yoke, the stator tooth slots are formed between adjacent two stator teeth,

The first circumferential guide is located axially outward of the stator yoke, the second circumferential guide is located axially outward of the stator teeth,

In the axial direction of the stator core, the second circumferential conductor is located on a side of the first circumferential conductor away from the stator core.

12. The stator according to any one of claims 1-11, wherein the first coil and the second coil are preformed coils.

13. An electric motor assembly comprising a stator according to any one of claims 1-12.

14. A vehicle comprising the electric machine assembly of claim 13.