CN114825723A - Multilayer flat wire winding, stator module and motor - Google Patents

Abstract

The invention provides a multilayer flat wire winding, a stator assembly and a motor, and particularly relates to the technical field of motors. The multi-layer flat wire winding is arranged in an iron core slot of a motor stator, L layers of conductor coils are distributed in each iron core slot, L is an even number which is more than or equal to 4, each phase of winding of the multi-layer flat wire winding comprises a first coil group, a second coil group and a third coil group which are distributed along the circumferential direction of the stator iron core, and the first coil group is positioned on the 1 st layer or the L-th layer of the conductor coils; the second coil group is positioned on the 2 nd layer to the L-1 st layer of the conductor coil; the third coil group is distributed on the L-th layer or the 1 st layer of the conductor coil; the first coil group, the second coil group and the third coil group are connected at the welding end of the winding. The branch circuits of each phase of the flat wire winding have no circulating current, so that the loss can be reduced, and the motor efficiency can be improved.

Description

Multilayer flat wire winding, stator module and motor

Technical Field

The invention relates to the technical field of motors, in particular to a multilayer flat wire winding, a stator assembly and a motor.

Background

With the rapid development of new energy automobile technology, the performance requirements on the automobile driving motor are higher and higher, the main development trend of the new energy automobile motor is miniaturization and high-speed, and the miniaturization and high-speed inevitably require the motor efficiency to be greatly improved.

The flat wire winding can improve the groove filling rate of the motor compared with the round wire winding, the improvement of the groove filling rate means that more copper wires can be filled under the premise of unchanging the space, stronger magnetic field intensity is generated, and power density is improved, so that more and more flat wire motors are applied to a new energy automobile driving system. The existing flat wire motor mostly adopts short-moment windings to weaken magnetic potential harmonics of the windings, for example, CN 201520265436.3-a motor and a stator thereof use short-distance windings, and for example, CN 202010193400.4-a flat wire continuous wave winding stator and a motor thereof, although the flat wire continuous wave winding adopts whole-distance windings, the flat wire continuous wave winding is equivalent to a set of double-layer short-distance windings due to the staggered use of a staggered winding scheme, so that conductors in a slot belong to different phases, in order to ensure the reliability of insulation, interlayer insulation paper needs to be added, the slot fullness rate of the windings is reduced, and the efficiency of the motor is reduced.

Disclosure of Invention

In view of the above disadvantages of the prior art, the present invention provides a multi-layer flat wire winding, a stator assembly and a motor to improve the circulating current problem of the stator winding.

In order to achieve the above and other related objects, the present invention provides a multi-layer flat wire winding, which is installed in core slots of a stator of an electric machine, wherein L layers of conductor coils are distributed in each core slot, L is an even number greater than or equal to 4, each phase of winding of the multi-layer flat wire winding includes a first coil group, a second coil group and a third coil group, the first coil group is distributed in a chain manner along a circumferential direction of the stator of the electric machine, and the first coil group is located on the 1 st layer or the L th layer of the conductor coils; the second coil groups are distributed in a chain manner along the circumferential direction of the motor stator and are positioned on the 2 nd layer to the L-1 st layer of the conductor coil; the third coil groups are distributed in a chain manner along the circumferential direction of the motor stator, correspond to the first coil groups in position and are positioned on the L-th layer or the 1-th layer of the conductor coil; the first coil group, the second coil group and the third coil group are connected at the welding end of the winding.

In an example of the present invention, the first coil group, the second coil group and the third coil group are each a wave winding, the first coil group and the third coil group each include a plurality of first U-shaped coils and at least one second U-shaped coil, and the second coil group includes a plurality of first U-shaped coils.

In an example of the present invention, the first U-shaped coil includes a first U-shaped conductor and a second U-shaped conductor, the first U-shaped conductor is disposed around an outer side of the second U-shaped conductor and is connected in series through bent portions, the bent portions on two sides of the first U-shaped coil extend along a circumferential direction of the stator core by the same slot pitch, and the extending directions are opposite and away from each other.

In an example of the present invention, the second U-shaped coil includes a third U-shaped conductor and a fourth U-shaped conductor, the third U-shaped conductor surrounds the outer side of the fourth U-shaped conductor and is connected in series through bent portions, the bent portions on two sides of the second U-shaped coil extend along the circumferential direction of the stator core by the same slot pitch, and the extending directions are the same.

In an example of the present invention, the number of pole pairs of the motor is p, the number of core slots is Q, the pole distance y is Q/(2p), the span of the first U-shaped coil is y +1 or y-1, and the span of the second U-shaped coil is y +1 or y-1.

In an example of the invention, each phase winding of the multilayer flat wire winding comprises at least two branches.

In an example of the present invention, each phase winding of the multilayer flat wire winding includes a first branch and a second branch, and the winding directions of the first branch and the second branch are the same.

In an example of the present invention, the lead terminal of the first branch and the lead terminal of the second branch are different by one core slot in a circumferential direction of the motor stator.

In an example of the present invention, the lead end and the lead out end of each branch of each phase winding are different by y core slots in the circumferential direction of the motor stator.

In an example of the present invention, the lead terminal and the outlet terminal of each branch of each phase winding are located in different flat wire conductor layers.

In an example of the present invention, the flat wire conductors of each branch in the slot body are symmetrical, and all the flat wire conductors in the same slot body belong to windings of the same phase.

In another aspect, the present invention provides a stator assembly, which includes a stator core and a stator winding, where the stator winding is a multilayer flat wire winding according to the present invention.

The invention also provides a motor comprising the multi-phase flat wire winding or the stator assembly.

According to the multi-layer flat wire winding, the first coil group, the second coil group and the third coil group are reasonably distributed, so that the branches of each phase in the winding are completely equal in electrical parameters such as resistance, inductance and potential, and no circulating current exists among the branches after parallel connection, so that the efficiency of the motor is improved, and the vibration and noise of the motor are reduced; and all the flat wire conductors in the same groove body belong to the same phase, so that interlayer insulating paper can be eliminated, the groove fullness rate of the flat wire conductors is improved, and the motor efficiency is further improved. The invention has the advantages of simple manufacturing process, high efficiency, few coil forms and low production cost.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a multilayer flat wire winding according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of region I of FIG. 1;

FIG. 3 is a schematic diagram of a first coil assembly of a multilayer flat wire winding according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a first U-shaped coil of a multi-layer flat wire winding according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a second U-shaped coil of a multi-layer flat wire winding according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a second coil assembly of a multi-layer flat wire winding according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a third coil assembly in an embodiment of a multi-layer flat wire winding of the present invention;

FIG. 8 is a schematic view of a stator assembly according to an embodiment of the present invention;

FIG. 9 is an expanded view of the phase A winding of the stator assembly of the present invention;

FIG. 10 is a diagram illustrating two branches of the phase A winding connected in series to form a parallel branch according to an embodiment of the present invention;

fig. 11 is a schematic diagram of two parallel branches formed by connecting two branches of the phase-a winding in parallel according to an embodiment of the stator assembly of the present invention.

Description of the element reference numerals

100. A stator assembly; 110. a stator core; 111. a trough body; 120. a stator winding; 1201. an insertion end; 1202. welding the end; 121. a first coil group; 122. a second coil group; 123. a third coil group; 124. a first U-shaped coil; 125. a second U-shaped coil; 1241. a first U-shaped conductor; 12411. a first conductor body; 12412. a first bending portion; 1242. a second U-shaped conductor; 12421. a second conductor body; 12422. a second bending portion; 1251. a third U-shaped conductor; 12511. a third conductor body; 12512. a third bend portion; 1252. a fourth U-shaped conductor; 12521. a fourth conductor body; 12522. a fourth bend.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. It is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the respective manufacturers.

It should be understood that the terms "upper", "lower", "left", "right", "middle" and "one" used herein are for clarity of description only, and are not intended to limit the scope of the invention, and that changes or modifications in the relative relationship may be made without substantial technical changes and modifications.

Referring to fig. 1 to 11, the present invention provides a multi-layer flat wire winding, a stator assembly and a motor to improve the circulating current problem of the stator winding.

Referring to fig. 1 and 2, the multi-layer flat wire winding of the present invention is installed in core slots of a stator, L layers of conductor coils are distributed in each core slot, L is an even number greater than or equal to 4, each phase of winding of the flat wire winding includes a first coil group 121, a second coil group 122 and a third coil group 123, the first coil group 121 is distributed in a chain manner along the circumferential direction of the stator core, and the first coil group is located on the 1 st layer or the L th layer of the conductor coil; the second coil groups 122 are distributed in a chain manner along the circumferential direction of the stator core, and the second coil groups 122 are positioned on the 2 nd layer to the L-1 st layer of the conductor coil; the third coil group 123 is distributed in a chain shape along the circumferential direction of the stator core, and the third coil group 123 corresponds to the first coil group 121 and is positioned on the L-th layer or the 1-th layer of the conductor coil; that is, when the first coil group 121 is positioned on the 1 st layer of the conductor coil, the third coil group 123 is positioned on the L-th layer of the conductor coil layer, and when the first coil group 121 is positioned on the L-th layer of the conductor coil, the third coil group 123 is positioned on the 1 st layer of the conductor coil group. The first coil group 121, the second coil group 122, and the third coil group 123 are connected at the welding end 1202 of the winding to form a multilayer flat wire winding. The winding mode of the winding can ensure that all branches of each phase of winding are equal in electrical parameters such as resistance, inductance, potential and the like, and no circulation current exists between the branches after the branches are connected in parallel, so that the efficiency of the motor is improved, the vibration and the noise of the motor are reduced, the conductor of each slot belongs to the conductor of a certain phase, interlayer insulating paper is omitted, the slot fullness rate of the winding is increased, and the efficiency of the motor is further improved.

Referring to fig. 1, 3 to 7, the first coil group 121, the second coil group 122 and the third coil group 123 are all wave windings, and are in a chain structure formed by sequentially arranging a plurality of conductor coils along the circumferential direction of the stator core. The first coil group 121 includes a plurality of first U-shaped coils 124 and at least one second U-shaped coil 125, the plurality of first U-shaped coils 124 of the first coil group 121 are sequentially arranged from the start end along the circumferential direction of the stator core and are connected in series through a bent portion, and the second U-shaped coil 125 is disposed at the end of the first coil group and is connected with the last first U-shaped coil 124 through a bent section. The first U-shaped coil 124 includes a first U-shaped conductor 1241 and a second U-shaped conductor 1242, the first U-shaped conductor 1241 and the second U-shaped conductor 1242 have the same structure, the open ends have different sizes, and the first U-shaped conductor 1241 surrounds the second U-shaped conductor 1242. The first U-shaped conductor 1241 includes a first conductor body 12411 and first bent portions 12412 respectively connected to two ends of the first conductor body 12411, where the first bent portions 12412 at two ends of the first conductor body 12411 respectively extend along a circumferential direction of the stator core by a same slot pitch, and extend in opposite directions and are away from each other. The second U-shaped conductor 1242 is located inside the first U-shaped conductor 1241, the second U-shaped conductor 1242 includes a second conductor body 12421 and second bent portions 12422 respectively connected to two ends of the second conductor body 12421, the two second bent portions 12422 respectively extend along the circumferential direction of the stator core with the same slot pitch, the extending direction and the extending slot pitch of the two second bent portions 12422 are the same as the first bent portion 12412 on the corresponding side, and the first U-shaped conductor 1241 and the second U-shaped conductor 1242 are connected in series through the first bent portion 12411 and the second bent portion 12422. The second U-shaped coil 125 includes a third U-shaped conductor 1251 and a fourth U-shaped conductor 1252, the third U-shaped conductor 1251 and the fourth U-shaped conductor 1252 have the same structure, the open ends have different sizes, and the third U-shaped conductor 1251 surrounds the outer side of the fourth U-shaped conductor 1252. The third U-shaped conductor 1251 includes a third conductor main body 12511 and third bent portions 12512 connected to both ends of the third conductor main body 12511, respectively, and the third bent portions 12512 at both ends of the third conductor main body 12511 extend along the circumferential direction of the stator core by the same slot pitch and in the same extending direction, respectively. The fourth U-shaped conductor 1252 is located inside the fourth U-shaped conductor 1251, the fourth U-shaped conductor 1252 includes a fourth conductor body 12521 and fourth bent portions 12522 connected to both ends of the fourth conductor body 12521, the extending direction and the extending groove pitch of the two fourth bent portions 12522 are the same as those of the third bent portion 12512 on the corresponding side, and the third U-shaped conductor 1251 and the fourth U-shaped conductor 1252 are connected in series by the third bent portion 12511 and the second bent portion 12522. The second coil group 122 includes a plurality of first U-shaped coils 124, the third coil group 123 includes a plurality of first U-shaped coils 124 and a plurality of second U-shaped coils 125, and the structures of the first U-shaped coils and the second U-shaped coils in the second coil group 122 and the third coil group 123 are the same as those of the first U-shaped coils and the second U-shaped coils in the first coil group 121. When the flat wire winding is wound, the conductor bodies of the U-shaped coils in the first coil group 121, the second coil group 122 and the third coil group 123 are inserted from one end of the core slot of the stator core, and then the other ends of the U-shaped coils are bent and formed along the circumferential direction of the stator core according to the respective bending directions to form bending portions, so that the insertion ends of the winding are formed at the inserted ends of the U-shaped coils, and the U-shaped coils are welded together through the bending portions to form the welding ends of the winding.

Referring to fig. 9, the specific winding manner of the multi-layer flat wire winding is as follows: when the first coil group 121 is wound, when the lead end enters from the No. 27 slot body, the first U-shaped coil (the first U-shaped coil 124, whose span may be y +1, or y-1, where y is a motor pole pitch) is wound in the No. 27 and No. 34 slot bodies, because the bending portions of the U-shaped coil extend a certain slot pitch along the circumferential direction of the stator core, for example, the bending portions of the U-shaped coil extend 3 slot pitches outward, so that the two U-shaped coils are separated by 6 slot pitches, the second U-shaped coil is wound in the No. 40 and No. 45 slot bodies, the first U-shaped coil and the second U-shaped coil are connected in series through respective bending portions, the series connection mode is that the bending portion (the first bending portion or the third bending portion) outside the first U-shaped coil is connected with the bending portion (the second bending portion or the fourth bending portion) inside the second U-shaped coil, and the bending portion (the second bending portion or the fourth bending portion) inside the first U-shaped coil is connected with the bending portion outside the second U-shaped coil The bent portions (the first bent portion or the third bent portion) are connected until the first coil group 121 is wound for a circle along the circumferential direction of the stator core. The last U-shaped coil of the first coil assembly 121 is a second U-shaped coil, and the pole pitch is y +1 or y-1. The U-shaped coils with two spans are alternately arranged, for example, the span of the first U-shaped coil is y +1, the span of the second U-shaped coil is y-1, the span of the third U-shaped coil is y +1, and the span of the fourth U-shaped coil is y-1, so that the two U-shaped coils are alternately arranged. The second coil group 122 is arranged in the middle layer of the coil layer, and includes a plurality of first U-shaped coils, the span of the first U-shaped coils is y +1 or y-1, the first U-shaped coils in the second coil group 122 are sequentially wound along the circumferential direction of the stator core, wherein the first U-shaped coils in the second coil group 122 are cross-layer coils, and two sides of the first U-shaped coils are respectively located in adjacent conductor layers; because the second coil group 122 comprises a plurality of layers, the second coil group 122 is firstly wound by half according to the winding direction of the first coil group 121, then the third coil group 123 is wound, the winding mode of the third coil group 123 is the same as that of the first coil group 121, the difference lies in that the winding direction is opposite, then the rest second coil group 122 is wound according to the winding direction of the third coil group 123, and after the winding is finished, the bending sections of the coils are welded at the welding end to form a plurality of layers of flat wire windings. It should be noted that the "groove pitch" in the present invention refers to the difference between groove numbers, for example, the groove pitch between the groove body No. 3 and the groove body No. 9 is 6.

Referring to fig. 9, each phase of winding of the multi-layer flat wire winding of the present invention includes at least two branches, the winding directions of the branches are the same, and the lead end and the lead-out end of each branch have y core slots in the circumferential direction of the motor stator; the lead terminal and the outlet terminal of each branch are positioned on different conductor layers. Taking an example that each phase winding of the multi-phase winding comprises two branches, wherein the two branches are respectively marked as a first branch and a second branch, and the winding directions of the first branch and the second branch are the same, namely when the first branch is wound clockwise along the circumferential direction of the stator core, the second branch is also wound clockwise along the circumferential direction of the stator core; when the first branch is wound along the circumferential direction of the stator core in the counterclockwise direction, the second branch is also wound along the circumferential direction of the stator core in the counterclockwise direction. The lead end (incoming line end) of the first branch and the lead end of the second branch have a difference of one iron core groove in the circumferential direction of the stator core, the lead end and the outgoing line end of the first branch have a difference of y iron core grooves in the circumferential direction of the stator core, and the lead end and the outgoing line end of the second branch have a difference of y iron core grooves in the circumferential direction of the stator core. The lead terminals and the outlet terminals of the first branch and the second branch are located in different conductor coil layers, for example, the lead terminals are located in the conductor coil of the 6 th layer, and the outlet terminals are located in the conductor coil of the 5 th layer.

Referring to fig. 8, in another aspect, the present invention provides a stator assembly 100, where the stator assembly 100 includes a stator core 110 and a stator winding 120, the stator core 110 includes an overall cylindrical main body, a plurality of slots 111 for winding wiring are uniformly distributed along a circumferential direction in an inner ring of the cylindrical main body, the slots 111 are opened inward in a radial direction, the stator winding 120 is installed in the slots 111 of the stator core 110, L layers of flat conductors are distributed in each slot, and L is an even number layer greater than or equal to 4. Preferably, the stator winding 120 is a multi-layer flat wire winding of the present invention. The stator winding 120 includes an insertion end 201 and a welding end 1202 respectively disposed at two ends of the stator core 110, and in one embodiment, the downward end is the insertion end 1201, and the upward end is the welding end 1202.

In the present embodiment, the three-phase windings are respectively defined as an a-phase winding, a B-phase winding and a C-phase winding, and the winding method of the multi-layer flat wire winding of the present invention is described by taking 8 electrodes, 48 slots, and 6 layers of flat wire conductors in each slot, and 2 branches are provided for each phase of each pole, where the number of slots Q is 48, the number of conductor layers L is 6, the number of pole pairs P is 4, the pole pitch y is Q/(2P) is 6, the span of the coil in the first coil group 121 is 5 or 7, the span of the coil in the second coil group 122 is 5 or 7, the span of the coil in the third coil group 123 is 5 or 7, and the bent portion of the coil in each coil group extends 3 slot pitches in the circumferential direction of the stator core.

In order to express the wiring of the present invention more clearly, the winding development diagram of fig. 9 only shows the winding of the phase a winding, and does not relate to the phase B winding and the phase C winding, which are wound in the same manner as the phase a winding, except that the numbers of the slots at the incoming end and the outgoing end are different. For example, phase a includes a first branch A1X1 and a second branch A2X2, where A1 and A2 are the incoming ends of the windings and X1 and X2 are the outgoing ends. The wire inlet ends of the phase A winding are 27-numbered and 28-numbered slots, the wire inlet ends of the phase B winding can be 31-numbered and 32-numbered slots, and the wire inlet ends of the phase C winding can be 35-numbered and 36-numbered slots. In fig. 2, each tank body is sequentially provided with 6 layers, 5 layers, 4 layers, 3 layers, 2 layers and 1 layer from left to right. In the first branch and the second branch of the phase a, the first coil group 121 is located at the outermost layer (layer 6), the second coil group 122 is located at the second layer to the second outer layer (layers 2 to 5), and the third coil group 123 is located at the innermost layer (layer 1).

Referring to fig. 1, 3, 6, 7 and 9, the winding of phase a is specifically wound as follows: a first branch enters from the No. 27 slot body, a first U-shaped coil of the first coil group 121 enters from the 6 th layer of the No. 27 slot body and exits from the 6 th layer of the No. 34 slot body; because the bent part of each coil extends for 3 slot distances along the circumferential direction of the stator core, the second U-shaped coil enters from the 6 th layer of the No. 40 slot body and comes out from the 6 th layer of the No. 45 slot body; the third U-shaped coil enters from the 6 th layer of the No. 3 slot body and comes out from the 6 th layer of the No. 10 slot body, the fourth U-shaped coil enters from the 6 th layer of the No. 16 slot body and comes out from the 6 th layer of the No. 21 slot body, and the winding of the first coil group 121 is finished; the U-shaped coils in the first coil group 121 have spans of 5 and 7 alternately, the first three U-shaped coils are first U-shaped coils, and the fourth U-shaped coil is a second U-shaped coil. The first U-shaped coil of the second coil group 122 enters from the 5 th layer of the slot body 27 and comes out from the 4 th layer of the slot body 34; the second U-shaped coil enters from the 5 th layer of the No. 40 tank body and comes out from the 4 th layer of the No. 45 tank body; the third U-shaped coil enters from the 5 th layer of the No. 3 tank body and comes out from the 4 th layer of the No. 10 tank body, the fourth U-shaped coil enters from the 5 th layer of the No. 16 tank body and comes out from the 4 th layer of the No. 21 tank body to complete the winding of a circle; then a fifth U-shaped coil enters from the 3 rd layer of the No. 27 slot body and comes out from the 2 nd layer of the 34 layers; the sixth U-shaped coil enters from the 3 rd layer of the No. 40 tank body and comes out from the 2 nd layer of the No. 45 tank body; the seventh U-shaped coil enters from the 3 rd layer of the No. 3 slot body and comes out from the 2 nd layer of the No. 10 slot body, the eighth U-shaped coil enters from the 3 rd layer of the No. 16 slot body and comes out from the 2 nd layer of the No. 21 slot body to complete second-circle winding; then, a third coil group 123 is wound, the third coil group 123 is wound along the direction opposite to the first coil group 121, and the first U-shaped coil enters from the layer 1 of the No. 27 slot body and exits from the layer 1 of the No. 22 slot body; the second U-shaped coil enters from the layer 1 of the No. 16 tank body and comes out from the layer 1 of the No. 9 tank body; the third U-shaped coil enters from the layer 1 of the No. 3 tank body and comes out from the layer 1 of the No. 46 tank body, the fourth U-shaped coil enters from the layer 1 of the No. 40 tank body and comes out from the layer 1 of the No. 33 tank body to complete the winding of a circle; the U-shaped coils in the third coil group 123 are alternately arranged with the U-shaped coils having the span of 5 and the span of 7, the first three U-shaped coils in the third coil group 123 are the first U-shaped coils 124, and the last one is the second U-shaped coils 125. Then, a third coil of the second coil group 122 is wound, wherein a ninth U-shaped coil of the second coil group 122 enters from the 2 nd layer of the No. 27 slot body and exits from the 3 rd layer of the No. 22 slot body; a tenth U-shaped coil enters from the layer 2 of the No. 16 tank body and comes out from the layer 3 of the No. 9 tank body; the eleventh U-shaped coil enters from the layer 2 of the No. 3 tank body and comes out from the layer 3 of the No. 46 tank body, the twelfth U-shaped coil enters from the layer 2 of the No. 40 tank body and comes out from the layer 3 of the No. 33 tank body to complete the winding of the third coil; then, a fourth coil of the second coil group 122 is wound, and a thirteenth U-shaped coil of the second coil group 122 enters from the No. 4 layer of the No. 27 slot body and comes out from the No. 5 layer of the No. 22 slot body; the fourteenth U-shaped coil enters from the 4 th layer of the No. 16 slot body and comes out from the 5 th layer of the No. 9 slot body; the fifteenth U-shaped coil enters from the 4 th layer of the No. 3 slot body and comes out from the 5 th layer of the No. 46 slot body, the sixteenth U-shaped coil enters from the 4 th layer of the No. 40 slot body and comes out from the 5 th layer of the No. 33 slot body, and the winding of the first branch A1X1 is completed. The U-shaped coils in the second coil group 122 are alternately arranged with the first U-shaped coils having a span of 5 and a span of 7.

The winding direction of the second branch is the same as that of the first branch, and the U-shaped coils in each coil group are alternately arranged in a span 5 and a span 7. The second branch enters from No. 28 slot body, the first U-shaped coil of the first coil group 121 enters from the 6 th layer of No. 28 slot body and comes out from the 6 th layer of No. 33 slot body; the second U-shaped coil enters from the 6 th layer of the No. 39 slot body and exits from the 6 th layer of the No. 46 slot body; the third U type coil gets into from the 6 th floor of No. 4 cell bodies, comes out from the 6 th floor of No. 9 cell bodies, and the fourth U type coil gets into from the 6 th floor of No. 15 cell bodies, comes out from the 6 th floor of No. 22 cell bodies. The first U-shaped coil of the second coil assembly 122 enters from the 5 th layer of the No. 28 slot body and exits from the 4 th layer of the No. 33 slot body; the second U-shaped coil enters from the 5 th layer of the No. 39 tank body and exits from the 4 th layer of the No. 46 tank body; the third U-shaped coil enters from the 5 th layer of the No. 4 groove body and comes out from the 4 th layer of the No. 9 groove body, the fourth U-shaped coil enters from the 5 th layer of the No. 15 groove body and comes out from the 4 th layer of the No. 22 groove body to complete the winding of a circle; then, a fifth U-shaped coil enters from the No. 3 layer of the No. 28 slot body and exits from the No. 2 layer of the No. 33 slot body; the sixth U-shaped coil enters from the No. 3 layer of the No. 39 tank body and exits from the No. 2 layer of the No. 46 tank body; a seventh U-shaped coil enters from the 3 rd layer of the No. 4 slot body and comes out from the 2 nd layer of the No. 9 slot body, an eighth U-shaped coil enters from the 3 rd layer of the No. 15 slot body and comes out from the 2 nd layer of the No. 22 slot body to complete second-circle winding; then, a third coil group 123 is wound, the third coil group 123 is wound along the direction opposite to the first coil group 121, and the first U-shaped coil enters from the layer 1 of the No. 28 tank body and exits from the layer 1 of the No. 21 tank body; the second U-shaped coil enters from the layer 1 of the No. 15 tank body and comes out from the layer 1 of the No. 10 tank body; the third U-shaped coil enters from the 1 st layer of the No. 4 slot body and comes out from the 1 st layer of the No. 45 slot body, the fourth U-shaped coil enters from the 1 st layer of the No. 39 slot body and comes out from the 1 st layer of the No. 34 slot body to complete the circle of winding. Then, a third coil of the second coil group 122 is wound, wherein a ninth U-shaped coil of the second coil group 122 enters from the 2 nd layer of the No. 28 slot body and exits from the 3 rd layer of the No. 21 slot body; a tenth U-shaped coil enters from the layer 2 of the slot body No. 15 and comes out from the layer 3 of the slot body No. 10; the eleventh U-shaped coil enters from the layer 2 of the No. 4 tank body and comes out from the layer 3 of the No. 45 tank body, the twelfth U-shaped coil enters from the layer 2 of the No. 39 tank body and comes out from the layer 3 of the No. 34 tank body to finish the winding of the third coil; then, a fourth coil of the second coil group 122 is wound, and a thirteenth U-shaped coil of the second coil group 122 enters from the No. 4 layer of the No. 28 slot body and comes out from the No. 5 layer of the No. 21 slot body; the fourteenth U-shaped coil enters from the 4 th layer of the No. 15 slot body and comes out from the 5 th layer of the No. 10 slot body; the fifteenth U-shaped coil enters from the 4 th layer of the No. 4 slot body and comes out from the 4 th layer of the No. 45 slot body, the sixteenth U-shaped coil enters from the 4 th layer of the No. 39 slot body and comes out from the 5 th layer of the No. 34 slot body, and the winding of the second branch A2X2 is completed. And then the U-shaped coil bent parts of the first coil group 121, the second coil group 122 and the third coil group 123 are mutually welded and communicated at the welding end 1202 to form an a-phase winding.

The winding path of the first branch A1X1 of the a-phase winding is as follows:

A1->27(6)->34(6)->40(6)->45(6)->3(6)->10(6)->16(6)->21(6)->27(5)->34(4)->40(5)->45(4)->3(5)->10(4)->16(5)->21(4)->27(3)->34(2)->40(3)->45(2)->3(3)->10(2)->16(3)->21(2)->27(1)->22(1)->16(1)->9(1)->3(1)->46(1)->40(1)->33(1)->27(2)->22(3)->16(2)->9(3)->3(2)->46(3)->40(2)->33(3)->27(4)->22(5)->16(4)->9(5)->3(4)->46(5)->40(4)->33(5)->X1

the winding path of the second branch A2X2 of the a-phase winding is as follows:

A2->28(6)->33(6)->39(6)->46(6)->4(6)->9(6)->15(6)->22(6)->28(5)->33(4)->39(5)->46(4)->4(5)->9(4)->15(5)->22(4)->28(3)->33(2)->39(3)->46(2)->4(3)->9(2)->15(3)->22(2)->28(1)->21(1)->15(1)->10(1)->4(1)->45(1)->39(1)->34(1)->28(2)->21(3)->15(2)->10(3)->4(2)->45(3)->39(2)->34(3)->28(4)->21(5)->15(4)->10(5)->4(4)->45(4)->39(4)->34(5)->X2

wherein numerals outside the brackets represent slot numbers and numerals inside the brackets represent the number of layers.

As can be seen from the above specific winding direction, the lead ends (the lead ends A1, A2) of the first branch A1XA and the second branch A2X2 are different by one slot in the circumferential direction; the lead end A1 of the first branch is in a No. 27 groove body, the outlet end X1 is in a No. 33 groove body, so that the difference between the lead end A1 and the outlet end X1 of the first branch is 6 grooves in the circumferential direction; the lead end A2 of the second branch is in No. 28 groove body, the outlet end is in No. 34 groove body, so the difference between the lead end and the outlet end of the second branch is 6 grooves in the circumferential direction; the wire inlet ends of the first branch and the second branch are located on the outermost layer (the 6 th layer) in the conductor coil layer, and the wire outlet ends are located on the secondary outer layer (the 5 th layer) in the conductor coil layer.

After winding of the phase A is finished, the phase B and the phase C are sequentially wound according to the same winding mode, the wire inlet ends of the phase B are groove bodies of No. 31 and No. 32, the wire inlet ends of the phase C are groove bodies of No. 35 and No. 36, after winding is finished, two parallel branches of each phase are equal in electrical parameters such as resistance, inductance and potential, and after parallel connection, the branch parts have no circular current, so that the efficiency of the motor is improved, and vibration and noise of the motor are reduced. And the conductors in each slot body belong to the same phase, interlayer insulating paper is omitted, the slot filling rate of the winding is improved, and the efficiency of the motor is further improved. The arrangement of the windings is simple in manufacturing process, few in coil form and low in production cost.

Referring to fig. 10 and fig. 11, two branches A1X1 and A2X2 of phase a may form a parallel branch by being connected in series, that is, the outlet end of the first branch is connected to the inlet end of the second branch; or two parallel branches are formed by parallel connection, as shown in fig. 9, a star connection method is adopted, and of course, a triangle connection method may also be adopted in other embodiments.

The invention also provides a motor which comprises the multilayer flat wire winding or the stator assembly.

It should be noted that, in the present invention, the stator and the motor have not been described in detail, and can be implemented by conventional technical means, and are not described herein again.

The multi-layer flat wire winding ensures that parameters such as resistance, inductance, potential and the like of parallel branches of each phase are equal through reasonable winding wiring, and no circulating current exists between the branches after parallel connection, so that the efficiency of the motor is improved, and the vibration and noise of the motor are reduced; and the conductors in the same slot body belong to the same phase winding, so that interlayer insulating paper can be eliminated, the slot fullness rate can be improved, and the efficiency of the motor can be further improved. Therefore, the invention effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (12)

1. The utility model provides a multilayer flat wire winding, installs in the iron core inslot of motor stator, its characterized in that, every it has L layer conductor coil to distribute in the iron core inslot, L is the even number that is more than or equal to 4, every looks winding of multilayer flat wire winding includes:

the first coil groups are distributed in a chain manner along the circumferential direction of the motor stator, and are positioned on the 1 st layer or the L-most layer of the conductor coil;

the second coil groups are distributed in a chain manner along the circumferential direction of the motor stator and are positioned on the 2 nd layer to the L-1 layer of the conductor coil;

the third coil groups are distributed in a chain manner along the circumferential direction of the motor stator, correspond to the first coil groups in position and are positioned on the L-th layer or the 1-th layer of the conductor coil;

the first coil group, the second coil group and the third coil group are connected at the welding end of the winding.

2. The multi-layer flat wire winding of claim 1, wherein the first, second, and third coil groups are each wave windings, the first and third coil groups each comprising a first plurality of U-shaped coils and at least one second U-shaped coil, the second coil group comprising a first plurality of U-shaped coils.

3. The multilayer flat wire winding according to claim 2, wherein the first U-shaped coil comprises a first U-shaped conductor and a second U-shaped conductor, the first U-shaped conductor is arranged around the outer side of the second U-shaped conductor and is connected in series through bent portions, the bent portions on two sides of the first U-shaped coil extend along the circumferential direction of the stator core by the same slot pitch, and the extending directions are opposite and away from each other.

4. The multilayer flat wire winding according to claim 3, wherein the second U-shaped coil includes a third U-shaped conductor and a fourth U-shaped conductor, the third U-shaped conductor is surrounded on the outer side of the fourth U-shaped conductor and is connected in series through bent portions, the bent portions on both sides of the second U-shaped coil extend along the circumferential direction of the stator core by the same slot pitch, and the extending directions are the same.

5. The multi-layer flat wire winding according to claim 2, wherein the number of pole pairs of the motor is p, the number of core slots is Q, the pole distance is Q/(2p), the span of the first U-shaped coil is y +1 or y-1, and the span of the second U-shaped coil is y +1 or y-1.

6. The multilayer flat wire winding of claim 1, characterized in that each phase of the multilayer flat wire winding comprises at least two legs.

7. The multilayer flat wire winding of claim 6, wherein each phase winding includes a first leg and a second leg, the first leg and the second leg being wound in the same direction.

8. The multi-layer flat wire winding of claim 7, wherein the lead end of the first leg and the lead end of the second leg differ by one core slot in a circumferential direction of the motor stator.

9. The multilayer flat wire winding according to claim 6, wherein the lead end and the lead out end of each leg of each phase winding are separated by y core slots in the circumferential direction of the motor stator.

10. The multilayer flat wire winding of claim 6, wherein the lead end and the outlet end of each leg of each phase winding are located at different conductor layers.

11. A stator assembly comprising a stator core and a stator winding, wherein the stator winding is a multi-phase flat wire winding according to any one of claims 1 to 10.

12. An electrical machine comprising a multi-phase flat wire winding according to any of claims 1 to 10 or a stator assembly according to claim 11.

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