CN217769657U

CN217769657U - Flat wire stator and motor

Info

Publication number: CN217769657U
Application number: CN202221228950.6U
Authority: CN
Inventors: 陆润达
Original assignee: Xiaomi Automobile Technology Co Ltd
Current assignee: Xiaomi Automobile Technology Co Ltd
Priority date: 2022-05-18
Filing date: 2022-05-18
Publication date: 2022-11-08
Anticipated expiration: 2032-05-18

Abstract

The utility model provides a flat wire stator and motor belongs to the motor field. The flat wire stator comprises an iron core and a flat wire winding; the flat wire winding comprises a first phase winding, the first phase winding comprises 2N coils, each coil comprises three branches, and the three branches in the same coil are sequentially offset by one iron core slot along the circumferential direction of the iron core; in the 2N coils, a first branch of the adjacent N coils, a second branch of the adjacent other N coils and a third branch of the adjacent N coils are sequentially connected in series to form a first main branch; the first branches of the other N adjacent coils, the second branches of the other N adjacent coils and the third branches of the other N adjacent coils are sequentially connected in series to form a second main branch. The first main branch and the second main branch are connected in parallel to form a phase winding, and the winding structure is simple. The first end of the coil is extended to the second end, so that a multilayer winding is formed gradually, the types of hairpin flat wires used in winding can be reduced, and the production efficiency is improved.

Description

Flat wire stator and motor

Technical Field

The disclosure relates to the field of motors, in particular to a flat wire stator and a motor.

Background

With the continuous and vigorous development of electric vehicles, the power density of the motor of the electric vehicle is also higher and higher. The flat wire motor compares the round wire motor, has higher groove filling rate, and the promotion of groove filling rate means under the unchangeable prerequisite in space, can fill more copper lines, produces stronger magnetic field, further promotes power density.

The flat wire motor comprises a rotor and a flat wire stator, and the flat wire stator comprises an iron core and a flat wire winding. The winding mode of the flat wire winding can affect the performance, the process and other aspects of the flat wire motor. The flat wire winding in the flat wire motor is formed by welding the hairpin flat wire inserted into the iron core slot, the used hairpin flat wire has the same structure, the process difficulty can be reduced, the production efficiency is improved, the used hairpin flat wire types are more, and the production efficiency is lower.

In the related art, when winding, a flat wire winding is wound in a plurality of iron core slots along the circumferential direction of an iron core to form a winding layer, and then the flat wire is connected to another layer in a cross-over manner, and then the winding is performed in the plurality of iron core slots along the circumferential direction of the iron core to form another winding layer until the required number of layers is reached. The winding mode is not only more complex, but also more types of required hairpin flat wires, which results in lower production efficiency.

SUMMERY OF THE UTILITY MODEL

The embodiment of the disclosure provides a flat wire stator and a motor, the winding mode is simple, and the improvement of the production efficiency of the flat wire motor is facilitated. The technical scheme is as follows:

in one aspect, the disclosed embodiments provide a flat wire stator comprising an iron core and a flat wire winding;

the iron core is provided with a plurality of iron core slots;

the flat wire winding comprises a first phase winding, the first phase winding comprises 2N coils, N is a positive integer, the 2N coils are rotationally and symmetrically distributed along the axis of the iron core, the coils are wound in part of the iron core slots in the iron core slots, the first ends and the second ends of the coils are positioned at the same end of the iron core, the first ends are positioned at the side, far away from the axis of the iron core, of the iron core slots, and the second ends are positioned at the side, close to the axis of the iron core, of the iron core slots;

the coil comprises three branches, the three branches in the same coil are sequentially arranged in a manner of offsetting one iron core groove along the circumferential direction of the iron core, and the three branches comprise a first branch, a second branch and a third branch;

from a first coil, in a first circumferential direction, in the 2N coils, a first branch of the adjacent N coils, a second branch of the adjacent other N coils, and a third branch of the adjacent N coils are sequentially connected in series to form a first main branch, where the first coil is any one of the 2N coils;

and sequentially connecting a third branch of the other N adjacent coils, a second branch of the other N adjacent coils and a first branch of the other N adjacent coils in series along a second circumferential direction from the 2N coil to form a second main branch, wherein the second circumferential direction is opposite to the first circumferential direction, and the 2N coil is adjacent to the first coil along the second circumferential direction.

In a possible implementation manner of the embodiment of the present disclosure, in the first main branch and/or the second main branch, between the connected first branches, between the connected second branches, and between the connected third branches are connected by first jumper lines, respectively, and the connected first branch and the connected second branch, between the connected second branch and the connected third branch, and between the connected third branch and the first branch are connected by second jumper lines, respectively, where a span of the second jumper line is smaller than a span of the first jumper line.

In a possible implementation manner of the embodiment of the present disclosure, at one end of the iron core, the first jumper wire and the branch connected to each other are of an integrally formed structure, and the second jumper wire and the branch connected to each other are of an integrally formed structure.

In a possible implementation manner of the embodiment of the present disclosure, the branch includes a first sub-coil and a second sub-coil that are connected to each other, and the first sub-coil is located on one side of the second sub-coil, which is far away from the axis of the iron core;

the first sub-coil is wound in two iron core grooves which are mutually spaced, the second sub-coil is wound in the other two iron core grooves which are mutually spaced, and the two iron core grooves in which the second sub-coil is located are respectively offset by one iron core groove along the same direction relative to the two iron core grooves in which the first sub-coil is located.

In one possible implementation of the embodiment of the present disclosure, the number of turns of the first sub-coil and the second sub-coil is the same.

In one possible implementation of the embodiment of the present disclosure, the first sub-coil and the second sub-coil are welded.

In one possible implementation manner of the embodiment of the present disclosure, the number of the core slots is 18p, p is a pole pair number, and N =2p.

Optionally, the number of layers of the coil in each iron core slot is 4m +6, and m is a natural number.

In a possible implementation manner of the embodiment of the present disclosure, the flat wire winding further includes a second phase winding and a third phase winding, and the first phase winding, the second phase winding, and the third phase winding are rotationally and symmetrically distributed around an axis of the iron core.

On the other hand, the embodiment of the present disclosure further provides a motor, where the motor includes a rotor and the flat wire stator described in the previous aspect.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:

the winding of the same phase is arranged to comprise 2N coils, the 2N coils are rotationally and symmetrically distributed along the axis of the iron core, the coils are wound in partial iron core grooves, each coil comprises 3 branches, one part of the 2N coils is sequentially connected in series into a first main branch, the other part of the 2N coils is sequentially connected in series into a second main branch, and therefore the first main branch and the second main branch are connected in parallel to form the winding of the same phase, and the winding structure is simple. And the first end and the second end of coil are located the one side of the axis that the iron core groove is kept away from the iron core respectively and are close to the one side of the axis of iron core, that is to say, extend to the second end from the first end of coil, have formed multilayer winding gradually, rather than form another layer of winding of another layer of formation of another layer of crossover coupling after forming one layer of winding again, need not additionally set up the flat wire conductor from one layer of crossover coupling to another layer to the kind of hairpin flat wire that uses when can reducing the wire winding, improve production efficiency.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is apparent that the drawings in the description below are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings may be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a flat wire stator provided in an embodiment of the present disclosure;

fig. 2 is an end view of a core provided by an embodiment of the present disclosure;

fig. 3 is an expanded schematic view of a flat wire winding provided by an embodiment of the disclosure;

FIG. 4 is an enlarged partial schematic view of FIG. 3;

fig. 5 is a schematic diagram of a first primary leg provided by an embodiment of the present disclosure;

fig. 6 is a schematic diagram of a second primary branch provided by an embodiment of the present disclosure;

FIG. 7 is an enlarged partial schematic view of FIG. 2;

FIG. 8 is an enlarged partial schematic view of FIG. 3;

fig. 9 is a schematic structural diagram of a first hairpin flat wire according to an embodiment of the disclosure;

FIG. 10 is a schematic structural view of a second hairpin flat wire according to an embodiment of the disclosure;

FIG. 11 is a schematic structural view of a third hairpin flat wire according to an embodiment of the disclosure;

fig. 12 is a schematic structural view of a fourth hairpin flat wire according to an embodiment of the disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," "third," and similar terms in the description and claims of the present disclosure are not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, which may also change accordingly when the absolute position of the object being described changes.

Fig. 1 is a schematic structural diagram of a flat wire stator provided in an embodiment of the present disclosure. As shown in fig. 1, the flat wire stator includes a core 10 and a flat wire winding 20.

Fig. 2 is an end view of an iron core according to an embodiment of the present disclosure. As shown in fig. 2, the core 10 has a plurality of core slots 10a. The core 10 is cylindrical, and a plurality of core slots 10a are distributed on the inner side wall of the core 10 along the circumferential direction of the core 10. The core slots 10a are used for winding the flat wire winding 20.

Fig. 3 is an expanded schematic view of a flat wire winding provided by an embodiment of the present disclosure. The core 10 is shown with its flattened end surfaces cut along the dashed lines in fig. 2. Each column in the figure shows one core hole 10a. For the sake of easy understanding, the plurality of core slots 10a are respectively denoted by arabic numerals, and the core slots 10a denoted by

reference numerals

1,2, 3, and 54 are repeatedly shown, and the side denoted by reference numerals 1 to 54 is the inner side of the core 10. In the figure, "o" indicates a flat wire conductor extending outward from the paper surface in the core hole 10, "x" indicates a flat wire conductor extending inward from the paper surface, and a line connecting the "o" and the "x" indicates a flat wire conductor located outside the core hole 10a. As shown in fig. 3, the flat wire winding 20 includes a first phase winding 201.

Illustratively, for a three-phase motor, the flat wire winding 20 further includes a second phase winding and a third phase winding, and the first phase winding 201, the second phase winding, and the third phase winding are rotationally symmetrically distributed around the axis of the iron core 10. The first phase winding 201, the second phase winding, and the third phase winding have the same structure, and the lines connecting "∘" and "x" shown in fig. 3 and "ao" and "x" to which the lines are connected constitute the first phase winding 201. The remaining "∘" and "x" in the figure are connected by lines with reference to the first phase winding 201, and then the second phase winding and the third phase winding are obtained. The embodiment of the present disclosure will be described taking the structure of the first phase winding 201 as an example.

The first phase winding 201 includes 2N coils 202, N being a positive integer, that is, the first phase winding 201 includes an even number of coils 202. Fig. 4 is a partially enlarged schematic view of fig. 3. One coil 202 is shown in fig. 4. As shown in fig. 3, 2N coils 202 are distributed rotationally symmetrically along the axis of the core 10, and the coils 202 are wound around a part of the core slots 10a among the plurality of core slots 10a. The first end and the second end of the coil 202 are located at the same end of the core 10, and the first end is located at the side of the core slot 10a away from the axis of the core 10, i.e., the upper side in fig. 4, and the second end is located at the side of the core slot 10a close to the axis of the core 10, i.e., the lower side in fig. 4.

As shown in fig. 4, the coil 202 includes three legs 205, and the three legs 205 in the same coil 202 are sequentially arranged offset by one core slot 10a in the circumferential direction of the core 10. Wherein each coil 202 includes a first leg 2051, a second leg 2052, and a third leg 2053.

Taking one coil 202 shown in fig. 4 as an example, the first branch 2051, the second branch 2052, and the third branch 2053 are sequentially offset by one core slot 10a in the first direction.

Fig. 5 is a schematic diagram of a first main branch provided by an embodiment of the present disclosure. In fig. 5, the portions of the first main branch 20a at both ends of the core 10 are distinguished by thick and thin dashed lines, and as shown in fig. 5, from a first coil 202 (see the coil shown by the rectangular frame a in fig. 3), in 2N coils 202 along the first circumferential direction, a first branch 2051 of the adjacent N coils 202, a second branch 2052 of the adjacent other N coils 202, and a third branch 2053 of the adjacent N coils 202 are sequentially connected in series to form the first main branch 20a. The first coil 202 is any one coil 202 of 2N coils 202.

Fig. 6 is a schematic diagram of a second main branch provided by an embodiment of the present disclosure. As shown in fig. 6, starting from the 2 nth coil 202 (see the coil shown by the rectangular frame B in fig. 3), the first branch 2051 of the adjacent another N coils 202, the second branch 2052 of the adjacent N coils 202, and the third branch 2053 of the adjacent another N coils 202 are sequentially connected in series along the second circumferential direction to form a second main branch 20B. The second circumferential direction is opposite to the first circumferential direction, and the 2 nth coil 202 is a coil 202 adjacent to the first coil 202 in the second circumferential direction.

The winding of the same phase is set to comprise 2N coils, the 2N coils are rotationally and symmetrically distributed along the axis of the iron core, the coils are wound in partial iron core grooves, each coil comprises 3 branches, one part of the 2N coils is sequentially connected in series into a first main branch, the other part of the 2N coils is sequentially connected in series into a second main branch, and therefore the winding of the same phase formed by the first main branch and the second main branch is formed, and the winding structure is simple. And the first end and the second end of coil are located the one side of the axis that the iron core groove is kept away from the iron core respectively and are close to the one side of the axis of iron core, that is to say, extend to the second end from the first end of coil, have formed multilayer winding gradually, rather than form another layer of winding of another layer of formation of another layer of crossover coupling after forming one layer of winding again, need not additionally set up the flat wire conductor from one layer of crossover coupling to another layer to the kind of hairpin flat wire that uses when can reducing the wire winding, improve production efficiency.

Alternatively, the number of the core slots 10a is 18p, p is a pole pair number, and N =2p. The number of layers of coil 202 in each iron core slot 10a is 4m +6, and m is a natural number.

The coil 202 is formed of a flat wire conductor, such as a copper flat wire, and the number of layers of the coil 202 in each core slot 10a is the number of layers of the flat wire conductor accommodated in the same core slot 10a.

An insulating material, such as an insulating resin, is provided in the core slot 10a to insulate the flat wire winding 20 from the core 10.

The values of p and m may be different for different motors. The values of p and m can be set according to the performance requirements of the motor. In the embodiment of the present disclosure, p =3,m =0 is taken as an example, that is, the number of pole pairs is 3, the core 10 has 54 core slots 10a, and the number of layers of the coil 202 in each core slot 10a is 6.

For convenience of explanation, the 54 core slots 10a are numbered in order in the circumferential direction of the core 10, as shown in fig. 3. Fig. 7 is a partially enlarged schematic view of fig. 2. As shown in fig. 7, the number of layers of the coil 202 in each core slot 10a is 6, i.e., there are 6 layers of flat wire conductors in each core slot 10a. The layer closest to the axis of the iron core 10 is taken as a first layer, and the layer is sequentially taken as a second layer, a third layer, a fourth layer, a fifth layer and a sixth layer along the radial direction of the iron core 10 outwards, and the first layer, the third layer, the fourth layer, the fifth layer and the sixth layer are distinguished by Chinese characters of 'one', 'two' \ 8230; \8230; 'six' respectively in fig. 3, 4, 5 and 6.

As shown in fig. 4, the coil 202 includes 3 branches 205. The 3 branches 205 are respectively a first branch 2051, a second branch 2052, and a third branch 2053, and the 3 branches 205 in the same coil 202 are sequentially offset by one core slot 10a along the circumferential direction of the core 10. When the flat-wire motor is connected, the branches 205 in the coils 202 are respectively connected to form a first main branch 20a and a second main branch 20b, and the first main branch 20a and the second main branch 20b are connected in parallel, so that the first phase winding 201 can be supplied with a larger current to form a stronger magnetic field.

Fig. 8 is a partially enlarged schematic view of fig. 3. As shown in fig. 8, in the first main branch 20a, the first connecting branches 2051, the second connecting branches 2052, and the third connecting branches 2053 are connected by a first jumper line 301. The first branch 2051 and the second branch 2052 which are connected to each other, the second branch 2052 and the third branch 2053 which are connected to each other, and the third branch 2053 and the first branch 2051 which are connected to each other by a second jumper 302.

The span of the second jumper 302 is less than the span of the first jumper 301. For example, in this example, the first jumper 301 has a span of 9 and the second jumper 302 has a span of 8. The branch is connected through setting up first jumper wire 301 and second jumper wire 302, forms first main branch 20a and second main branch 20b, conveniently connects, adjusts through the molding to first jumper wire 301 and second jumper wire 302, can reduce the volume of flat line stator.

In the second main branch 20b, adjacent branches are also connected by the first jumper 301 or the second jumper 302.

Alternatively, at one end of the core 10, the first jumper 301 and the branch 205 are connected to form an integral structure, and the second jumper 302 and the branch 205 are connected to form an integral structure.

The structure of the flat wire stator can be made more compact by providing the integrally formed structure, and the integrally formed structure can make the resistances of the first main branch 20a and the second main branch 20b smaller than in welding.

At the other end of the core 10, a first jumper 301 and a second jumper 302 may be welded with the leg 205, respectively.

For convenience of explanation, as shown in fig. 5, (n, m) is defined to represent the m-th layer of the n-numbered core hole 10a. One end of the first main branch 20a is a first end of a first branch 2051 of one of the coils 202 for inputting or outputting current, the first main branch 20a is bridged from (20, 6) to (11, 5), from (11, 5) to (20, 4), from (20, 4) to (12, 3), from (12, 3) to (21, 2), from (21, 2) to (12, 1), from (12, 1) to (21, 1) through a first crossover wire 301, from (21, 1) to (30, 2), and from (30, 2) to (21, 3), then from (21, 3) to (29, 4), from (29, 4) to (20, 5), from (20, 5) to (29, 6), from (29, 6) to (38, 6) via a first crossover line 301, from (38, 6) to (29, 5), from (29, 5) to (38, 4), from (38, 4) to (30, 3), from (30, 3) to (39, 2), from (39, 2) to (30, 1), from (30, 1) to (38, 1) via a second crossover line 302, from (38, 1) to (47, 2) Further from (47, 2) to (38, 3), from (38, 3) to (46, 4), from (46, 4) to (37, 5), from (37, 5) to (46, 6), from (46, 6) through a first crossover line 301 to (1, 6), from (1, 6) to (46, 5), from (46, 5) to (1, 4), from (1, 4) to (47, 3), from (47, 3) to (2, 2), from (2, 2) to (47, 1), from (47, 1) to (2, 1), from (47, 1) through a first crossover line 301 to (2, 1), from (2, 1) to (11, 2), from (11, 2) to (2, 3), from (2, 3) to (10, 4), from (10, 4) to (1, 5) to (10, 6), from (1, 1) to (10, 18) to (18), from (6, 6) to (18), from (9, 18) to (18), then from (10, 3) to (19, 2), from (19, 2) to (10, 1), from (10, 1) to (19, 1) via a first crossover line 301, from (19, 1) to (28, 2), from (28, 2) to (19, 3), from (19, 3) to (27, 4), from (27, 4) to (18, 5), from (18, 5) to (27, 6), from (27, 6) to (36, 6) via a first crossover line 301, from (36, 6) to (27, 5), from (27, 5) to (36, 4), from (36, 4) to (28, 3), from (28, 3) to (37, 2), from (37, 2) to (28, 1), and from (28, 1) to form a first branch, a, and from (28, 1) to the other end of the first branch.

The second main branch 20b can be seen in fig. 6.

As shown in fig. 4, the branch 205 includes a first sub-coil 203 and a second sub-coil 204 connected, and the first sub-coil 203 is located on the side of the second sub-coil 204 away from the axis of the core 10.

The first sub-coil 203 is wound in two core slots 10a spaced apart from each other, the second sub-coil 204 is wound in the other two core slots 10a spaced apart from each other, and the two core slots 10a in which the second sub-coil 204 is located are offset by one core slot 10a in the same direction with respect to the two core slots 10a in which the first sub-coil 203 is located, respectively. That is, the first sub-coil 203 and the second sub-coil 204 are not wound in the same two core slots 10a, and the first sub-coil 203 and the second sub-coil 204 are shifted by a distance of one core slot 10a in the circumferential direction of the core 10. This makes the span between the ends of the first and second sub-coils 203 and 204 connected smaller than the span of the first crossover line 301, thereby forming a short-pitch winding.

Optionally, the first and second sub-coils 203 and 204 are welded, facilitating the connection of the first and second sub-coils 203 and 204.

In this example, two core slots 10a around which the first sub-coil 203 is wound are spaced by 8 core slots 10a, the first sub-coil 203 is located outside the two core slots 10a, and the span of the flat wire conductor crossing the two core slots 10a is 9, where the span is the number of the core slots 10a spaced between the two core slots 10a connected plus 1. For example, if the flat wire conductor connects two adjacent core slots 10a, the span is 1. Two iron core slots 10a wound by the second sub-coil 204 are also separated by 8 iron core slots 10a, the second sub-coil 204 is positioned outside the two iron core slots 10a, and the span of the flat wire conductor bridging the two iron core slots 10a is also 9. In the coil 202, only 7 core slots 10a are spaced at a distance of 8 between the ends of the first and second sub-coils 203 and 204. This is to form a short-pitch winding by making the pitch smaller than the pole pitch. The short-distance winding can weaken high-order harmonics, reduce Vibration in the running process of the motor, reduce Noise and improve NVH (Noise, vibration and Harshness) performance.

Taking the first branch 2051 of one of the coils 202 as an example, as shown in fig. 4, the first sub-coil 203 is bridged from (20, 6) to (11, 5) and then from (11, 5) to (20, 4). The first sub-coil 203 is connected to the second sub-coil 204 at (20, 4) across (12, 3). The second sub-coil 204 is bridged from (12, 3) to (21, 2) and then from (21, 2) to (12, 1).

In addition, the first sub-coil 203 is bridged from (20, 6) to (11, 5) and then from (11, 5) to (20, 4), and the second sub-coil 204 is bridged from (12, 3) to (21, 2) and then from (21, 2) to (12, 1), the spans of the parts are the same and are bridged between two adjacent layers, therefore, the structures of the flat wire conductors of the parts can be set to be the same, thereby further reducing the process difficulty and improving the production efficiency.

Alternatively, the number of turns of the first sub-coil 203 and the second sub-coil 204 are equal, that is, the relative shift of the first sub-coil 203 and the second sub-coil 204 occurs at a central position of the coil 202, which is advantageous to ensure the balance of the windings.

In the disclosed embodiment, the number of turns of the first sub-coil 203 and the second sub-coil 204 are both 2.

Each coil 202 is formed by a plurality of hairpin flat wires connected together. As an example, the disclosed embodiments provide five configurations of hairpin flat wires.

Fig. 9 is a schematic structural diagram of a first hairpin flat wire according to an embodiment of the disclosure. As shown in fig. 9, the first hairpin flat wire 1000 includes two first straight segments 1001 and a first bridging segment 1002 connecting the two first straight segments 1001. When mounted to the core 10, the two first straight line segments 1001 are located in two core slots 10a and are the first layer in the core slots 10a. For example, the 2 first straight line segments 1001 of the first hairpin flat line 1000 in fig. 9 may correspond to (12, 1) and (21, 1) in fig. 8, respectively. The first jumper section 1002 forms the first jumper 301. The first span 1002 is 9.

Fig. 10 is a schematic structural view of a second hairpin flat wire according to an embodiment of the disclosure. As shown in fig. 10, the second hairpin flat wire 2000 includes two second straight segments 2001 and a second jumper segment 2002 connecting the two second straight segments 2001. When mounted to the core 10, the two second straight line segments 2001 are located in two core slots 10a, and are the second and third layers in the core slots 10a. For example, the 2 second straight segments 2001 of the second hairpin flat wire 2000 in fig. 10 may correspond to (10, 3) and (19, 2) in fig. 8, respectively. The second span 2002 is 9.

Fig. 11 is a schematic structural view of a third hairpin flat wire according to an embodiment of the disclosure. As shown in fig. 11, the third hairpin flat wire 3000 includes two third straight segments 3001 and a third bridging segment 3002 connecting the two third straight segments 3001. The two third straight line segments 3001 are located in the two core slots 10a, and are the fourth and fifth layers in the core slots 10a when mounted to the core 10. For example, the 2 third straight segments 3001 of the third hairpin flat wire 3000 in fig. 11 may correspond to (9, 5) and (18, 4) in fig. 8, respectively. The third span 3002 has 9 spans.

Fig. 12 is a schematic structural view of a fourth hairpin flat wire according to an embodiment of the disclosure. As shown in fig. 12, the fourth hairpin flat wire 4000 includes two fourth straight line segments 4001 and a fourth bridging segment 4002 connecting the two fourth straight line segments 4001. The two sections of the fourth straight line segment 4001 are located in the two core slots 10a when mounted to the core 10, and are the sixth layer in the core slots 10a. For example, the 2 fourth straight segments 4001 of the fourth hairpin flat wire 4000 in fig. 12 may correspond to (27, 6) and (36, 6) in fig. 8, respectively. The fourth span segment 4002 has a span of 9. The fourth crossover section 4002 also forms the first crossover 301.

The second hairpin flat wire 2000 and the third hairpin flat wire 3000 may have the same structure, and the first hairpin flat wire 1000 and the fourth hairpin flat wire 4000 may have the same structure. There is also a fifth hairpin flat wire having a structure similar to that of the fourth hairpin flat wire 4000 except for a span of 8, for example, two straight line segments of the fifth hairpin flat wire may correspond to (11, 6) and (19, 6) in fig. 8, respectively. The jumper section of the fifth hairpin flat wire forms a second jumper 302. The sixth hairpin flat wire has a structure similar to that of the first hairpin flat wire 4000 except that the span is 8, and for example, the two straight line segments of the sixth hairpin flat wire may correspond to (30, 1) and (38, 1) in fig. 8, respectively. The jumper section of the sixth hairpin flat wire also forms a second jumper 302.

After the above-described plurality of hairpin flat wires are mounted to the iron core 10, part of the hairpin flat wires may be welded to be connected into the first phase winding 201.

The disclosed embodiments also provide an electric machine comprising a rotor and a flat wire stator as shown in fig. 1.

The above description is intended only to illustrate the preferred embodiments of the present disclosure, and should not be taken as limiting the disclosure, as any modifications, equivalents, improvements and the like which are within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.

Claims

1. A flat wire stator is characterized by comprising an iron core (10) and a flat wire winding (20);

the iron core (10) has a plurality of iron core slots (10 a);

the flat wire winding (20) comprises a first phase winding (201), the first phase winding (201) comprises 2N coils (202), N is a positive integer, the 2N coils (202) are rotationally and symmetrically distributed along the axis of the iron core (10), the coils (202) are wound in part of iron core slots (10 a) in the iron core slots (10 a), the first end and the second end of each coil (202) are located at the same end of the iron core (10), the first end is located on the side, far away from the axis of the iron core (10), of the iron core slot (10 a), and the second end is located on the side, close to the axis of the iron core (10), of the iron core slot (10 a);

the coil (202) comprises three branches (205), three branches (205) in the same coil (202) are sequentially arranged along the circumferential direction of the iron core (10) in a manner of being offset by one iron core slot (10 a), and the three branches (205) comprise a first branch (2051), a second branch (2052) and a third branch (2053);

starting from a first coil (202), in a first circumferential direction, first branches (2051) of adjacent N coils (202), second branches (2052) of adjacent other N coils (202), and third branches (2053) of the adjacent N coils (202) of the 2N coils (202) are sequentially connected in series to form a first main branch (20 a), both ends of the first main branch (20 a) include one end of the first branch (2051) of the first coil (202) and one end of the third branch (2053) of the nth coil (202) starting from the first coil (202) in the first circumferential direction, and the first coil (202) is any one coil (202) of the 2N coils (202);

-starting from the 2 nth coil (202), the third branch (2053) of the adjacent further N coils (202), the second branch (2052) of the adjacent N coils (202), the first branch (2051) of the adjacent further N coils (202) are serially connected in sequence along a second circumferential direction, forming a second main branch (20 b), the two ends of the second main branch (20 b) comprising one end of the third branch (2053) of the 2 nth coil (202) and one end of the first branch (2051) of the N +1 th coil (202) along the first circumferential direction, starting from the first coil (202), the second circumferential direction being opposite to the first circumferential direction, the 2 nth coil (202) being the coil (202) adjacent to the first coil (202) along the second circumferential direction.

2. The flat wire stator according to claim 1,

in the first main branch (20 a) and/or the second main branch (20 b), the connected first branches (2051), the connected second branches (2052) and the connected third branches (2053) are connected through a first bridging line (301) respectively,

the first branch (2051) and the second branch (2052) which are connected with each other, the second branch (2052) and the third branch (2053) which are connected with each other, and the third branch (2053) and the first branch (2051) which are connected with each other are respectively connected with each other through a second jumper (302),

the span of the second jumper (302) is less than the span of the first jumper (301).

3. The flat wire stator according to claim 2, wherein at one end of the core (10), the first jumper wire (301) and the leg (205) that are connected are of an integrally formed structure, and the second jumper wire (302) and the leg (205) that are connected are of an integrally formed structure.

4. The flat wire stator according to claim 2, wherein the branch (205) comprises a first sub-coil (203) and a second sub-coil (204) which are connected, the first sub-coil (203) is positioned on the side of the second sub-coil (204) far away from the axis of the iron core (10);

the first sub-coil (203) is wound in two iron core grooves (10 a) which are mutually spaced, the second sub-coil (204) is wound in the other two iron core grooves (10 a) which are mutually spaced, and the two iron core grooves (10 a) in which the second sub-coil (204) is positioned respectively deviate from the two iron core grooves (10 a) in which the first sub-coil (203) is positioned by one iron core groove (10 a) along the same direction.

5. The flat wire stator of claim 4, wherein the first and second subcoils (203, 204) have the same number of turns.

6. The flat wire stator of claim 4, wherein the first sub-coil (203) and the second sub-coil (204) are welded.

7. The flat wire stator according to any one of claims 1 to 6, wherein the number of the core slots (10 a) is 18p, p is a pole pair number, and N =2p.

8. The flat wire stator according to any one of claims 1 to 6, characterized in that the number of layers of the coil in each core slot (10 a) is 4m +6, m being a natural number.

9. The flat wire stator according to any one of claims 1 to 6, wherein the flat wire winding (20) further comprises a second phase winding and a third phase winding, and the first phase winding (201), the second phase winding and the third phase winding are rotationally symmetrically distributed around the axis of the core (10).

10. An electrical machine comprising a rotor and a flat wire stator according to any one of claims 1 to 9.