CN111884393A

CN111884393A - Motor stator and motor

Info

Publication number: CN111884393A
Application number: CN202010792964.XA
Authority: CN
Inventors: 刘延海; 柏荣键
Original assignee: Tianjin Santroll Electric Automobile Technology Co Ltd
Current assignee: Tianjin Santroll Electric Automobile Technology Co Ltd
Priority date: 2020-08-08
Filing date: 2020-08-08
Publication date: 2020-11-03

Abstract

The invention relates to the field of motors and discloses a motor stator and a motor, which comprise a stator core, a stator core and a motor core, wherein the stator core is provided with a plurality of grooves which are formed on the radial inner surface of the stator core and are spaced at preset groove intervals along the circumferential direction of the stator core; a stator winding including a plurality of phase windings mounted on the stator core so as to be different from each other in electrical phase; the method is characterized in that: at least two branch windings in each phase winding are sequentially connected in parallel along the circumferential direction of the stator core; the phase winding includes a plurality of conductor sets including: a plurality of first conductor sets, each first conductor set comprising: a first U-shaped conductor and a second U-shaped conductor; the invention adopts a completely symmetrical structure on the magnetic circuit through the winding structure, eliminates the problem of circulating current generated by an asymmetrical structure, reduces torque fluctuation and torque fluctuation, has less harmonic wave, reduces noise, reduces bus bars, simplifies manufacturing procedures, reduces production cost and improves processing efficiency.

Description

Motor stator and motor

Technical Field

The invention relates to the field of motors, in particular to a motor stator and a motor.

Background

In the prior art, a stator winding comprises a plurality of types of conductor coils, and the plurality of types of conductor coils penetrate into a slot of a stator core according to a certain arrangement mode to form a required winding of a single-phase motor or a multi-phase motor. The hairpin coils used in the prior art are more in special-shaped types and complex in arrangement mode, a large number of bus bars and bus bars are needed to be used for connecting branches and neutral points of windings of each phase, the manufacturing process is complex, the production cost is high, and the processing efficiency is low.

Disclosure of Invention

The invention provides a motor stator and a motor, which adopt a completely symmetrical structure on a magnetic circuit through a winding structure, eliminate the problem of loop current generated by an asymmetrical structure, reduce torque fluctuation, have less harmonic waves, reduce noise, have simple arrangement mode, reduce the use of bus bars and bus bars, have simple branch and neutral point connection mode of windings of each phase, simplify the manufacturing procedure, reduce the production cost and improve the processing efficiency.

In order to achieve the purpose, the invention adopts the following technical scheme:

an electric machine stator comprising:

a stator core having a plurality of slots formed on a radially inner surface thereof and spaced apart at predetermined slot pitches in a circumferential direction of the stator core;

a stator winding including a plurality of phase windings mounted on the stator core so as to be different from each other in electrical phase;

at least two branch windings in each phase winding are sequentially connected in parallel along the circumferential direction of the stator core;

the phase winding includes:

a plurality of conductor sets, the plurality of conductor sets comprising:

a plurality of first conductor sets, each first conductor set comprising: a first U-shaped conductor and a second U-shaped conductor;

at least 2 second conductor sets, each second conductor set comprising: a third U-shaped conductor and a fourth U-shaped conductor;

each U-shaped conductor includes two slot interiors for insertion into different slots;

dividing each slot into 4M layers according to the number of the inner portions of the slots which can be accommodated in the radial direction of the stator core by a plurality of conductor groups of the phase winding, wherein M is an integer greater than or equal to 1;

the two groove interiors of each U-shaped conductor of the second conductor group are positioned on the 4M/2 th layer and the 4M/2+1 th layer in the radial direction of the stator core;

the two groove interiors of the second U-shaped conductor of each first conductor group are positioned in the distance between the two groove interiors of the first U-shaped conductors;

the two slot interiors of the fourth U-shaped conductor of each second conductor set are within the spacing of the two slot interiors of the third U-shaped conductor.

Further, the pitch between the two groove interiors of each U-shaped conductor of the first conductor set is different from the pitch between the two groove interiors of each U-shaped conductor of the second conductor set.

Further, the pitch between the two inside slots of the first U-shaped conductor of the first conductor set of the phase winding is greater than the pole pitch of the stator winding, the pitch between the two inside slots of the second U-shaped conductor of the first conductor set of the phase winding is smaller than the pole pitch of the stator winding, the pitch between the two inside slots of the third U-shaped conductor of the second conductor set of the phase winding is greater than the pole pitch of the stator winding, and the pitch between the two inside slots of the fourth U-shaped conductor of the second conductor set of the phase winding is equal to the pole pitch of the stator winding.

Further, the pitch between the two inside slots of the first U-shaped conductor of the first conductor set of the phase winding is larger than the pole pitch of the stator winding, the pitch between the two inside slots of the second U-shaped conductor of the first conductor set of the phase winding is smaller than the pole pitch of the stator winding, the pitch between the two inside slots of the third U-shaped conductor of the second conductor set of the phase winding is equal to the pole pitch of the stator winding, and the pitch between the two inside slots of the fourth U-shaped conductor of the second conductor set of the phase winding is smaller than the pole pitch of the stator winding.

Further, the pitch between the inside of two slots of the first U-shaped conductor of the first conductor group of the phase winding is 7, the pitch between the inside of two slots of the second U-shaped conductor of the first conductor group of the phase winding is 5, the pitch between the inside of two slots of the third U-shaped conductor of the second conductor group of the phase winding is 8, and the pitch between the inside of two slots of the fourth U-shaped conductor of the second conductor group of the phase winding is 6.

Further, the pitch between the inside of two slots of the first U-shaped conductor of the first conductor group of the phase winding is 7, the pitch between the inside of two slots of the second U-shaped conductor of the first conductor group of the phase winding is 5, the pitch between the inside of two slots of the third U-shaped conductor of the second conductor group of the phase winding is 6, and the pitch between the inside of two slots of the fourth U-shaped conductor of the second conductor group of the phase winding is 4.

Further, each U-shaped conductor of each conductor set of each phase winding further comprises: one end of the stator core positioned outside the axial slots is connected with two welding ends inside the two slots;

one welding end of a first U-shaped conductor of one first conductor group and one welding end of a second U-shaped conductor of the other first conductor group in each phase winding along the circumferential direction of the stator core are connected with each other, and the pitch between the two welding ends connected with each other is a whole pitch; and/or one welding end of a first U-shaped conductor of one first conductor group and one welding end of a fourth U-shaped conductor of one second conductor group are connected with each other, and the pitch between the two welding ends connected with each other is a whole pitch; and/or one welding end of the second U-shaped conductor of one first conductor group and one welding end of the third U-shaped conductor of one second conductor group are connected with each other, and the pitch between the two welding ends connected with each other is a whole pitch.

Furthermore, the stator winding further comprises an outgoing line positioned on the radial outermost layer of the stator core and/or an outgoing line positioned on the radial innermost layer of the stator core, and the outgoing line is positioned at the other end outside the axial slot of the stator core.

Furthermore, except that the two slot interiors of each U-shaped conductor of each conductor group of the phase winding positioned in the same radial direction of the outgoing line are positioned on the N-th layer and the (N + 1) -th layer which are adjacent to each other in the radial direction of the stator core, the two slot interiors of each U-shaped conductor of other conductor groups of the phase winding are positioned on the N-th layer and the (N-1) -th layer which are adjacent to each other in the radial direction of the stator core, wherein N is an even number which is more than or equal to 2.

Furthermore, except that the two grooves of each U-shaped conductor of each conductor group of the phase winding positioned in the same radial direction of the outgoing line are positioned on the N-th layer and the N + 1-th layer which are adjacent to each other in the radial direction of the stator core, any U-shaped conductor positioned on the N-th layer and the N + 1-th layer is arranged in other circumferential regions of the stator core, wherein N is an even number which is more than or equal to 2.

In order to achieve the above object, the present invention also provides a motor including the above motor stator.

The technical scheme of the invention is applied, the stator of the motor and the motor comprise a stator core, wherein the stator core is provided with a plurality of grooves which are formed on the radial inner surface of the stator core and are spaced at preset groove intervals along the circumferential direction of the stator core; a stator winding including a plurality of phase windings mounted on the stator core so as to be different from each other in electrical phase; at least two branch windings in each phase winding are sequentially connected in parallel along the circumferential direction of the stator core; the phase winding includes a plurality of conductor sets including: a plurality of first conductor sets, each first conductor set comprising: a first U-shaped conductor and a second U-shaped conductor; at least 2 second conductor sets, each second conductor set comprising: a third U-shaped conductor and a fourth U-shaped conductor; each U-shaped conductor includes two slot interiors for insertion into different slots; dividing each slot into 4M layers according to the number of the inner portions of the slots which can be accommodated in the radial direction of the stator core by a plurality of conductor groups of the phase winding, wherein M is an integer greater than or equal to 1; the two groove interiors of each U-shaped conductor of the second conductor group are positioned on the 4M/2 th layer and the 4M/2+1 th layer in the radial direction of the stator core; the two groove interiors of the second U-shaped conductor of each first conductor group are positioned in the distance between the two groove interiors of the first U-shaped conductors; the two slot interiors of the fourth U-shaped conductor of each second conductor set are within the spacing of the two slot interiors of the third U-shaped conductor. The winding structure adopts a completely symmetrical structure on a magnetic circuit, eliminates the problem of loop current generated by an asymmetrical structure, reduces torque fluctuation, has less harmonic waves, reduces noise, has simple arrangement mode, reduces the use of a bus bar and a bus bar, has simple branch and neutral point connection mode of each phase winding, simplifies the manufacturing process, reduces the production cost and improves the processing efficiency.

Drawings

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

FIG. 2 is a schematic diagram of a phase winding according to one embodiment of the present invention;

FIG. 3 is a schematic structural diagram of insulation paper in a slot of a stator of a first motor according to an embodiment of the present invention;

FIG. 4 is a schematic view of a second structure of insulation paper in a stator slot of a motor according to an embodiment of the present invention;

FIG. 5 is a schematic view of an insulation paper structure in a stator slot of a third motor according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of an insulation paper structure in a slot of a stator of a fourth motor according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of insulation paper in a slot of a fifth motor in the embodiment of the invention;

FIG. 8 is a schematic diagram of a first conductor set forming a stator winding in accordance with one embodiment of the present invention;

FIG. 9 is a schematic diagram of a second conductor set forming a stator winding in accordance with one embodiment of the present invention;

FIG. 10 is a schematic diagram of a partial connection of a phase winding according to an embodiment of the present invention;

FIG. 11A is a schematic diagram of a planar development of the plug end of a phase winding according to an embodiment of the present invention;

FIG. 11B is a schematic diagram of a planar development of the welded ends of a phase winding in accordance with one embodiment of the present invention;

FIG. 12 is a schematic diagram of a second phase winding according to the second embodiment of the present invention;

fig. 13 is a schematic structural diagram of a phase winding according to a second embodiment of the present invention;

fig. 14 is a schematic structural diagram of a phase winding according to a third embodiment of the present invention;

FIG. 15 is a schematic diagram of a planar development of the plug end of a phase winding in accordance with a third embodiment of the present invention;

fig. 16 is a schematic diagram of a phase winding according to a fourth embodiment of the present invention;

FIG. 17 is a schematic diagram of a partial connection of phase windings in a fourth embodiment of the present invention;

FIG. 18A is a schematic diagram of a planar development of the plug end of a phase winding according to a fourth embodiment of the present invention;

FIG. 18B is a schematic diagram of a weld end plane development of a phase winding in a fourth embodiment of the present invention;

fig. 19 is a schematic structural view of a one-phase winding in accordance with a fifth embodiment of the present invention;

fig. 20 is a schematic structural view of a phase winding in a sixth embodiment of the present invention;

fig. 21 is a schematic structural view of a stator of a motor in a seventh embodiment of the invention;

fig. 22 is a schematic structural view of a one-phase winding in the seventh embodiment of the present invention;

fig. 23 is a schematic structural view of a second conductor group forming a stator winding according to the embodiment of the invention;

FIG. 24 is a schematic view of a partial connection of phase windings in a seventh embodiment of the present invention;

FIG. 25A is a schematic diagram of a planar development of the plug end of a phase winding according to a seventh embodiment of the present invention;

FIG. 25B is a schematic diagram of a weld end plane development of a phase winding in a seventh embodiment of the present invention;

fig. 26 is a schematic diagram of a planar development of the plug end of a phase winding in an eighth embodiment of the invention;

fig. 27 is a schematic structural view of a one-phase winding in an eighth embodiment of the present invention;

fig. 28 is a schematic structural view of a phase winding in the ninth embodiment of the present invention;

fig. 29 is a schematic diagram of a planar development of the plug end of a phase winding in accordance with a ninth embodiment of the invention;

fig. 30 is a schematic structural view of a stator of a motor in the tenth embodiment of the invention;

fig. 31 is a schematic structural view of a one-phase winding in the tenth embodiment of the invention;

FIG. 32A is a schematic diagram of a planar development of the phase windings in a tenth embodiment of the invention;

FIG. 32B is a schematic diagram of a weld end planar development of a ten phase winding in accordance with an embodiment of the present invention;

fig. 33 is a schematic view of a one-phase winding in an eleventh embodiment of the invention;

fig. 34 is a schematic diagram of a one-phase winding in accordance with a twelfth embodiment of the present invention;

FIG. 35 is a schematic diagram of a star electrical connection in accordance with an embodiment of the present invention;

FIG. 36 is a schematic view of another star connection in accordance with an embodiment of the present invention;

FIG. 37 is a schematic diagram of a triangular electrical connection in an embodiment of the invention;

FIG. 38 is a schematic view of an alternative triangular electrical connection in accordance with an embodiment of the present invention;

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

It should be noted that the terms "first", "second", and the like in the description and claims of the present invention and the accompanying drawings are used for distinguishing different objects, and are not used for limiting a specific order. The following embodiments of the present invention may be implemented individually, or in combination with each other, and the embodiments of the present invention are not limited in this respect.

In the present application, the pitch is the interval between two groove interiors 301 of the same conductor along the circumferential direction, or the pitch is the interval between a groove interior 301 corresponding to one welding end of one conductor and a groove interior 301 corresponding to one welding end of another conductor along the circumferential direction; it should be noted that, in the present application, the first radial layer of the stator core may be the first layer away from the central axial direction of the stator core, or may be the first layer close to the central axial direction of the stator core.

As shown in fig. 1, an embodiment of the present invention provides a stator of an electric motor, including: a stator core 20 having a plurality of slots 21 formed on a radially inner surface thereof and spaced apart at predetermined slot pitches in a circumferential direction of the stator core;

as shown in fig. 1 to 34, the stator winding 10 includes a plurality of phase windings mounted on the stator core 20 so as to be different from each other in electrical phase, wherein at least two branch windings of each phase winding are connected in parallel in sequence in the circumferential direction of the stator core.

Referring to fig. 1 to 34, in the stator winding 10 in the present embodiment, the stator winding 10 is mounted on the stator core 20, that is, a plurality of phase windings mounted on the stator core 20 so as to be different from each other in electrical phase, wherein the stator winding 10 is a three-phase (i.e., U-phase, V-phase, W-phase) winding, and each phase slot of each pole is 2 or more; each magnetic pole of the rotor is provided with two slots 21, the number of slots per pole per phase is 2 in the embodiment, the rotor has eight magnetic poles and is corresponding to each phase of the three-phase stator winding 10, the number of the slots 21 arranged in the stator core 20 is equal to 48 (namely 2X8X3), as shown in FIGS. 2, 17, 22 and 31, 4 branch windings in each phase winding are sequentially connected in parallel along the circumferential direction of the stator core, U1, U2, U11 and U12 branch windings in the U phase winding are sequentially connected in parallel along the circumferential direction of the stator core, V1, V2, V11 and V12 branch windings in the V phase winding are sequentially connected in parallel along the circumferential direction of the stator core, and W1, W2, W11 and W12 branch windings in the W phase winding are sequentially connected in parallel along the circumferential direction of the stator core;

as shown in fig. 13, 14, 19, 20, 27, 28, 33 and 34, 2-branch windings in each phase winding are sequentially connected in parallel along the circumferential direction of the stator core, U1 and U2-branch windings in the U-phase winding are sequentially connected in parallel along the circumferential direction of the stator core, V1 and V2-branch windings in the V-phase winding are sequentially connected in parallel along the circumferential direction of the stator core, and W1 and W2-branch windings in the W-phase winding are sequentially connected in parallel along the circumferential direction of the stator core;

further, in the present embodiment, the stator core 20 is formed by stacking a plurality of annular magnetic steel plates to form the stator core axial direction both end faces 25, 26 of the stator core 20 by defining one tooth portion 22 by two adjacent slots 21, and other conventional metal plates may be used instead of the magnetic steel plates; as shown in fig. 3, 4, 5, 6, and 7, a plurality of insulating papers 30 are inserted into the magnetic steel plate slots 21, fig. 3 shows that the first type of in-slot insulating paper 30 in this embodiment is a B-shaped insulating paper, fig. 4 shows that the second type of in-slot insulating paper 30 in this embodiment is a double-mouth insulating paper, fig. 5 shows that the third type of in-slot insulating paper 30 in this embodiment is an S-shaped paper, fig. 6 shows that the fourth type of in-slot insulating paper 30 in this embodiment is a large S-shaped insulating paper, in this embodiment, any one of four types of in-slot insulating paper may be selected to isolate the inter-phase conductors in the slots 21, and fig. 7 shows that the fifth type of in-slot insulating paper 30 in this embodiment is a single large-mouth insulating paper, when conductor insulation is selected to be thicker, isolation is not required in the middle, and the fifth type of in-slot insulating paper 30 may be used.

As shown in fig. 2, 8, 9, 13, 14, 22, 23, 27, and 28, in the first to third embodiments and the seventh to ninth embodiments, each of the phase windings (U-phase winding, V-phase winding, and W-phase winding) includes: 30 conductor sets, the 30 conductor sets including: 28 first conductor set 200,2 second conductor sets (250, 350); first conductor set 200 includes a first U-shaped conductor 200A and a second U-shaped conductor 200B, and second conductor set 250 includes: the third U-shaped conductor 250A (350A) and the fourth U-shaped conductor 250B (350B), each U-shaped conductor (200A, 200B, 250A, 250B, 350A, 350B) comprises a welding end 303, a groove inner part 301, a plug wire end 302, a groove inner part 301 and a welding end 303 which are connected in sequence, and the two groove inner parts 301 are inserted into different grooves of two layers of stator cores which are adjacent in the radial direction.

As shown in fig. 17, 19, 20, 31, 33, and 34, in the fourth to sixth embodiments and the tenth to twelfth embodiments, each of the phase windings (U-phase winding, V-phase winding, and W-phase winding) includes: 14 conductor sets, the 14 conductor sets comprising: 12 first conductor sets 200,2 second conductor sets; first conductor set 200 includes a first U-shaped conductor 200A and a second U-shaped conductor 200B, and second conductor set 250(350) includes: the third U-shaped conductor 250A (350A) and the fourth U-shaped conductor 250B (350B), each U-shaped conductor (200A, 200B, 250A, 250B, 350A, 350B) comprises a welding end 303, a groove inner part 301, a plug wire end 302, a groove inner part 301 and a welding end 303 which are connected in sequence, and the two groove inner parts 301 are inserted into different grooves of two layers of stator cores which are adjacent in the radial direction. That is, in the present embodiment, each phase winding includes at least 2 second conductor sets.

As shown in fig. 1 to 34, in the first to third embodiments and the seventh to ninth embodiments, the number of the first conductor groups and the second conductor groups of the U-phase winding in the first to third embodiments is 8 according to the number of the inside of the slots that each slot can accommodate in the radial direction of the stator core, that is, each slot is divided into 4M layers, M is an integer of 2, and the two inside of the slots of the third U-shaped conductor and the fourth U-shaped conductor of the second conductor group 250(350) are arranged in the fourth layer and the fifth layer in the radial direction of the stator core; in example four to example six and example ten to example twelve, the number of the first conductor group and the second conductor group of the U-phase winding in the slots that can be accommodated in the radial direction of the stator core is 4 according to each slot, that is, each slot is divided into 4M, where M is an integer of 1, and the two slot interiors of the third U-shaped conductor and the fourth U-shaped conductor of the second conductor group are located in the second layer and the third layer in the radial direction of the stator core. Namely, a first conductor group and a second conductor group of a U-phase winding (a V-phase winding and a W-phase winding) divide each slot into 4M layers according to the number of the inner portions of the slots which can be accommodated in the radial direction of the stator core of each slot, wherein M is an integer greater than or equal to 1; the two slot interiors of each U-shaped conductor of the second conductor group (250, 350) are positioned at the 4M/2 th layer and the 4M/2+1 th layer in the radial direction of the stator core;

with reference to fig. 8 and 11A, in the embodiment, the two slot interiors 301 of the second U-shaped conductors 200B of the first conductor group 200 are located in the 3 rd slot and the 8 th slot of the stator core, and the two slot interiors 301 of the first U-shaped conductors 200A are located in the 2 nd slot and the 9 th slot of the stator core; that is, the two slot interiors 301 of the second U-shaped conductor 200B in the stator core circumferential slot are located within the pitch of the two slot interiors 301 of the first U-shaped conductor 200A; with reference to fig. 9 and 10, the two slot interiors of the third U-shaped conductor 250A of the second conductor group are located in the 25 th slot and the 33 th slot of the stator core, and the two slot interiors of the fourth U-shaped conductor 250B are located in the 26 th slot and the 32 th slot of the stator core, that is, the two slot interiors 301 of the fourth U-shaped conductor 250B in the circumferential slot of the stator core are located within the interval between the two slot interiors 301 of the third U-shaped conductor 250A. The winding structure adopts a completely symmetrical structure on a magnetic circuit, so that the problem of circulating current generated by an asymmetrical structure is solved, torque fluctuation is reduced, harmonic waves are few, noise is reduced, a bus bar is reduced, the manufacturing process is simplified, the production cost is reduced, and the processing efficiency is improved.

As shown in fig. 2, 8, 9, and 11A, in the first to sixth embodiments, the pitch between the two slot interiors 301 of the first U-shaped conductor 200A of the first conductor group 200 of the phase windings (U-phase winding, V-phase winding, and W-phase winding) is Z1 (Z1 in the present embodiment is 7 larger than the full pitch of the pole pitch 6 of the stator winding), the pitch between the two slot interiors 301 of the second U-shaped conductor 200B of the first conductor group 200 is X1 (X1 in the present embodiment is 5 smaller than the short pitch of the pole pitch 6 of the stator winding), the pitch between the two slot interiors 301 of the third U-shaped conductor 250A of the second conductor group is Z2 (Z2 in the present embodiment is 8 larger than the long pitch of the pole pitch 6 of the stator winding), the pitch between the two slot interiors 301 of the fourth U-shaped conductor 250B of the second conductor group 250 is Y (Y in the present embodiment is 6 equal to the full pitch of the pole pitch 6 of the stator winding), that is, the pitch Z1 between the two slot interiors of the first U-shaped conductor and the pitch X1 between the two slot interiors of the second U-shaped conductor of the first conductor set 200 are different from the pitch Z2 between the two slot interiors of the third U-shaped conductor and the pitch Y between the two slot interiors of the fourth U-shaped conductor of the second conductor set 250.

As shown in the figures 8 and 22, respectively, as shown in fig. 23 and 25A, in seventh to twelfth embodiments, the pitch between the two slot interiors 301 of the first U-shaped conductors 200A of the first conductor group 200 of the phase windings (U-phase winding, V-phase winding, W-phase winding) is Z1 (in the present embodiment, Z1 is a full pitch of 7 larger than the pole pitch 6 of the stator winding), the pitch between the two slot interiors 301 of the second U-shaped conductors 200B of the first conductor group 200 is X1 (in the present embodiment, X1 is a short pitch of 5 smaller than the pole pitch 6 of the stator winding), the pitch between the two slot interiors 301 of the third U-shaped conductors 350A of the second conductor group is Y (in the present embodiment, Y is a full pitch of 6 equal to the pole pitch 6 of the stator winding), and the pitch between the two slot interiors 301 of the fourth U-shaped conductors 350B of the second conductor group 350 is X2 (in the present embodiment, X2 is a short pitch of 4 smaller than the pole pitch 6 of the stator winding). That is, the pitch Z1 between the two slot interiors of the first U-shaped conductor and the pitch X1 between the two slot interiors of the second U-shaped conductor of the first conductor set 200 are different from the pitch Y between the two slot interiors of the third U-shaped conductor and the pitch X2 between the two slot interiors of the fourth U-shaped conductor of the second conductor set 350.

With reference to fig. 1 to 34, in the present embodiment, each U-shaped conductor of each conductor set of each phase winding is located at the end outside the axial slot 25 of the stator core and connected to two welding ends 303 of two slot interiors 301 in the same layer, and the two welding ends 303 are located outside the axial slot of the stator core and extend in opposite directions and away from each other;

as shown in fig. 10, in the first to sixth embodiments, the welding end of the first U-shaped conductor 200A of one first conductor group 200 in the phase winding (U-phase winding or V-phase winding or W-phase winding) connected inside the slot of the eighth 2 nd slot of the stator core and the welding end of the second U-shaped conductor 200B of the other first conductor group 200 connected inside the slot of the seventh 44 th slot of the stator core are connected to each other, and the pitch between the two welding ends connected to each other is the whole pitch 6; the welding end of the first U-shaped conductor 200A of one first conductor group of the phase winding, which is positioned inside the 14 th slot of the third layer of the stator core, is connected with the welding end of the fourth U-shaped conductor 250B of one second conductor group 250, which is positioned inside the 20 th slot of the fourth layer of the stator core in the radial direction, and the pitch between the two welding ends which are connected with each other is the whole pitch 6, the welding end of the fourth U-shaped conductor 250B of the second conductor group 250, which is positioned inside the 26 th slot of the fifth layer of the stator core in the radial direction, is connected with the welding end of the first U-shaped conductor 200A of the other first conductor group, which is positioned inside the 32 th slot of the sixth layer of the stator core in the radial direction, is connected with the welding end of the other first U-shaped conductor group, and the pitch between the two welding ends which are connected with each; the welding end of the second U-shaped conductor 200B of one first conductor group of the phase winding, which is positioned inside the groove of the third layer 13 groove in the radial direction of the stator core, is connected with the welding end of the third U-shaped conductor 250A of one second conductor group 250, which is positioned inside the groove of the fourth layer 19 groove in the radial direction of the stator core, and the pitch between the two welding ends connected with each other is the whole pitch 6, the welding end of the third U-shaped conductor 250A of the second conductor group 250, which is positioned inside the groove of the fifth layer 27 groove in the radial direction of the stator core, is connected with the welding end of the second U-shaped conductor 200B of the other first conductor group, which is positioned inside the groove of the sixth layer 33 groove in the radial direction of the stator core, is connected with the welding end of the other first conductor group, and the pitch between the two welding ends connected with each other is the whole.

As shown in fig. 24, in the seventh to twelfth embodiments, the welding end of the first U-shaped conductor 200A of one first conductor group 200 in the phase winding (U-phase winding or V-phase winding or W-phase winding) connected inside the slot of the 1 st slot in the eighth layer of the stator core and the welding end of the second U-shaped conductor 200B of the other first conductor group 200 connected inside the slot of the 43 th slot in the seventh layer of the stator core are connected to each other, and the pitch between the two welding ends connected to each other is the entire pitch 6; the welding end of the first U-shaped conductor 200A of one first conductor group of the phase winding, which is positioned inside the slot of the third 15 th slot of the stator core, is connected with the welding end of the fourth U-shaped conductor 250B of one second conductor group 250, which is positioned inside the slot of the radial fourth 21 st slot of the stator core, and the pitch between the two welding ends which are connected with each other is the whole pitch 6, the welding end of the fourth U-shaped conductor 250B of the second conductor group 250, which is positioned inside the slot of the radial fifth 25 th slot of the stator core, is connected with the welding end of the first U-shaped conductor 200A of the other first conductor group, which is positioned inside the slot of the radial sixth 31 th slot of the stator core, is connected with the welding end of the other first U-shaped conductor group, and the pitch between the two welding ends which are connected with each other is the whole pitch 6; the welding end of the second U-shaped conductor 200B of one first conductor group of the phase winding, which is positioned inside the 14 th slot of the third radial layer of the stator core, is connected with the welding end of the third U-shaped conductor 250A of one second conductor group 250, which is positioned inside the 20 th slot of the fourth radial layer of the stator core, and the pitch between the two welding ends which are connected with each other is the whole pitch 6, the welding end of the third U-shaped conductor 250A of the second conductor group 250, which is positioned inside the 26 th slot of the fifth radial layer of the stator core, is connected with the welding end of the second U-shaped conductor 200B of the other first conductor group, which is positioned inside the 32 th slot of the sixth radial layer of the stator core, is connected with the welding end of the other first conductor group, and the pitch between the two welding ends which are connected with each other is the whole pitch 6.

Further, as shown in fig. 11A, 11B, 12, 15, in the first to third embodiments, it should be noted that the connection manner of the welding ends of the stator windings in the second to third embodiments is the same as that of the welding ends of the stator windings in the first embodiment, and all the connection manners correspond to those in fig. 11B; with reference to fig. 11B, in the first to third embodiments, the pitch of the two weld ends of any one of the two U-shaped conductors forming the connection to each other in the circumferential direction of the stator core is the entire pitch 6. (the pitch between the inside of the slot corresponding to one weld end of one U-shaped conductor and the inside of the slot corresponding to one weld end of another U-shaped conductor is the entire pitch of 6.) accordingly, as shown in fig. 25A, 25B, 26 and 29, in the seventh to ninth embodiments, it should be noted that the connection manner of the weld ends of the stator windings in the eighth to ninth embodiments is the same as that of the weld ends of the stator windings in the seventh embodiment, and corresponds to that in fig. 25B; with reference to fig. 25B, in any one of the seventh to ninth embodiments, the pitch of the two weld ends of the two U-shaped conductors forming the connection with each other in the circumferential direction of the stator core is the entire pitch 6. (the pitch between the inside of the groove corresponding to one soldered end of one U-shaped conductor and the inside of the groove corresponding to one soldered end of the other U-shaped conductor is a full pitch of 6.)

As shown in fig. 1 to 34, in the present embodiment, the stator winding 10 further includes the lead-out wire 100 located at the radially outermost layer of the stator core 20 and/or located at the radially innermost layer of the stator core 20, the lead-out wire being located at the axially out-of-slot other end 26 of the stator core 20.

With reference to fig. 1, 2, 11A, 17, 25A, and 31, in the first embodiment, the fourth embodiment, the seventh embodiment, and the tenth embodiment, the outgoing line includes lead ends U1, U2, U11, and U12, lead ends U3, U4, U13, and U14, the lead ends U1 and U2 are located at the radially innermost layer of the stator core, the lead ends U11 and U12 are located at the radially outermost layer of the stator core, the lead ends U3 and U4 are located at the radially outermost layer of the stator core, the lead ends U13 and U14 are located at the radially innermost layer of the stator core, and one side of the outgoing line, which is connected to the neutral point and the phase terminal, and the plug end of the conductor are located at the same side 26 outside the axial slot of the stator core;

with reference to fig. 12 to 15, 19 to 20, 26 to 29, and 33 to 34, in the second embodiment, the third embodiment, the fifth embodiment, the sixth embodiment, the eighth embodiment, the ninth embodiment, the eleventh embodiment, and the twelfth embodiment, the outgoing line includes lead ends U1 and U2, lead ends U3 and U4, lead ends U1 and U2, and lead ends U3 and U4 are located at the outermost layer in the radial direction of the stator core; accordingly, they may be located at the radially innermost layers of the stator core.

With reference to fig. 1 to 34, in the embodiment, two slot interiors of the third U-shaped conductor of the second group of phase windings located in the same radial direction of the outgoing line (incoming line end, outgoing line end) are located at the radial 4 th and 5 th layers of the stator core, two slot interiors of the fourth U-shaped conductor are located at the radial 4 th and 5 th layers of the stator core, two slot interiors of the first U-shaped conductor of the first group are located at the radial 2 nd and 3 rd layers and 7 th layers of the stator core, two slot interiors of the second U-shaped conductor of the first group are located at the radial 2 nd and 3 rd layers, 6 th and 7 th layers of the stator core, two slot interiors of the first U-shaped conductor of the other first group of phase windings and two slot interiors of the second U-shaped conductor of the second group are located at the radial 2 nd and 1 st, 4 th and 3 rd layers, 6 th and 5 th layers, and the radial adjacent layers of the stator core, 8 th and 7 th layers;

of course, in the embodiment of the present application, in addition to the two slots corresponding to the third U-shaped conductor and the fourth U-shaped conductor of the second conductor group located in the same radial direction of the outgoing line, the N-th layer and the N + 1-th layer adjacent to the stator core in the radial direction are located inside the two slots, and the third U-shaped conductor and the fourth U-shaped conductor of the second conductor group located in the other circumferential regions of the stator winding may also have at least one N-th layer and one N + 1-th layer.

Illustratively, as shown in fig. 35, U-phase conductor lead terminals include U-phase terminals U1, U2, U11 and U12, V-phase conductor lead terminals include V-phase terminals V1, V2, V11 and V12, W-phase conductor lead terminals W1, W2, W11 and W12, U-phase conductor outlet terminals U3, U4, U13 and U14, V-phase conductor outlet terminals V3, V4, V13 and V14, and W-phase conductor outlet terminals W3, W4, W13 and W14 adopt connecting bodies to perform neutral point connection, that is, a 4-branch parallel star connection of the motor is completed; or as shown in fig. 38, using a delta connection; as shown in fig. 36, U-phase conductor lead ends have U-phase terminals U1, U2, V-phase conductor lead ends have V1, V2, W-phase conductor lead ends have W-phase terminals W1, W2, U-phase conductor lead ends U3, U4, V-phase conductor lead ends V3, V4, W-phase conductor lead ends W3, W4 adopt connectors to perform neutral point connection, that is, a 2-branch parallel star connection of the motor is completed; or, as shown in fig. 37, a delta connection is used.

It should be noted that the difference between the 4-branch parallel winding in the first embodiment of the present application and the second and third embodiments is only that the 4-branch parallel winding in the first embodiment adopts a structure of multiple conductor sets, the parallel winding in the second and third embodiments adopts a structure of multiple conductor sets for the 2-branch parallel winding, and the two conductor outlet ends U3 and U4 of the U-phase conductor in the first embodiment and the inlet ends U11 and U12 of the U-phase conductor in the second embodiment are connected by the structure of the conductor 600 at the radial 8 th layer of the stator core in the second embodiment, so as to form the 2-branch parallel winding in the second embodiment; in the third embodiment, the U-phase conductor outlet ends U3 and U4 and the U-phase conductor inlet ends U11 and U12 in the first embodiment are connected by adopting the structure of the conductor 500 at the radial 8 th layer of the stator core to form the 2-branch parallel winding in the third embodiment. Similarly, the difference between the 4-branch parallel winding in the fourth embodiment of the present application and the fifth and sixth embodiments is that the 4-branch parallel winding in the fourth embodiment adopts a structure of multiple conductor groups, the parallel winding in the fifth embodiment and the sixth embodiment adopts a structure of multiple conductor groups for the 2-branch parallel winding in the sixth embodiment, and the U-phase conductor outlet ends U3 and U4 and the U-phase conductor inlet ends U11 and U12 in the fourth embodiment, which are located at the radial 8 th layer of the stator core, are connected by adopting a structure of a conductor 600, so as to form the 2-branch parallel winding in the fourth embodiment; in the sixth embodiment, the U-phase conductor outlet ends U3 and U4 and the U-phase conductor inlet ends U11 and U12 in the fourth embodiment are connected by using the structure of the conductor 500, which is located at the radial 8 th layer of the stator core, to form the 2-branch parallel winding in the sixth embodiment, and accordingly, the seventh to twelfth embodiments are similar to the structure of the 2-branch parallel winding converted from the six-branch parallel winding in the first to sixth embodiments 4, and further description is omitted here.

The embodiment also provides a motor, which comprises the motor stator and a motor adopting the motor stator.

The pole pitch is the number of phases of each winding multiplied by the number of magnetic poles of each group of phase conductors, the coil with the pitch larger than the pole pitch is a long-pitch coil, the coil group with the pitch equal to the pole pitch is a full-pitch coil group, and the coil with the pitch smaller than the pole pitch is a short-pitch coil; specifically, each winding includes 3 sets of phase conductors, the number of slots per phase per pole is 2, and then the pole pitch is 2 × 3 or 6.

The motor provided by the embodiment of the present invention includes the motor stator in the above embodiment, and therefore, the motor provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, and details are not described herein again.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection may be mechanical or electrical, may be direct, may be indirect via an intermediate medium (bus connection), or may be communication between the two components. Those skilled in the art will understand what is specifically meant by the present invention. Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention and the technical principles applied.

It will be understood by those skilled in the art that the present invention is not limited to the embodiments illustrated herein, and that various obvious changes, rearrangements and substitutions may be made therein by those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An electric machine stator comprising:

a stator core having a plurality of slots formed on a radially inner surface thereof and spaced apart at a predetermined slot pitch in a circumferential direction of the stator core;

a stator winding including a plurality of phase windings mounted on the stator core so as to be different in electrical phase from each other;

the method is characterized in that: at least two branch windings in each phase winding are sequentially connected in parallel along the circumferential direction of the stator core;

the phase winding includes:

a plurality of conductor sets, the plurality of conductor sets comprising:

a plurality of first conductor sets, each of the first conductor sets comprising: a first U-shaped conductor and a second U-shaped conductor;

at least 2 second conductor sets, each said second conductor set comprising: a third U-shaped conductor and a fourth U-shaped conductor;

each of the U-shaped conductors includes two slot interiors for insertion into different slots;

dividing each slot into 4M layers according to the number of the inner portions of the slots which can be accommodated in the radial direction of the stator core by the plurality of conductor groups of the phase winding, wherein M is an integer greater than or equal to 1;

the two slot interiors of the second U-shaped conductors of each first conductor set are within the spacing of the two slot interiors of the first U-shaped conductors;

the two slot interiors of the fourth U-shaped conductor of each of the second conductor sets are within the spacing of the two slot interiors of the third U-shaped conductor.

2. The electric machine stator of claim 1, wherein a pitch between two slot interiors of each U-shaped conductor of the first conductor set is different from a pitch between two slot interiors of each U-shaped conductor of the second conductor set.

3. The machine stator of claim 2 wherein the pitch between the two slot interiors of the first U-shaped conductor of the first group of phase windings is greater than the pole pitch of the stator windings, the pitch between the two slot interiors of the second U-shaped conductor of the first group of phase windings is less than the pole pitch of the stator windings, the pitch between the two slot interiors of the third U-shaped conductor of the second group of phase windings is greater than the pole pitch of the stator windings, and the pitch between the two slot interiors of the fourth U-shaped conductor of the second group of phase windings is equal to the pole pitch of the stator windings.

4. The machine stator of claim 2 wherein the pitch between the two slot interiors of the first U-shaped conductors of the first group of phase windings is greater than the pole pitch of the stator windings, the pitch between the two slot interiors of the second U-shaped conductors of the first group of phase windings is less than the pole pitch of the stator windings, the pitch between the two slot interiors of the third U-shaped conductors of the second group of phase windings is equal to the pole pitch of the stator windings, and the pitch between the two slot interiors of the fourth U-shaped conductors of the second group of phase windings is less than the pole pitch of the stator windings.

5. A stator for an electric machine according to claim 3, wherein the pitch between the inside of two slots of the first U-shaped conductor of the first conductor set of the phase winding is 7, the pitch between the inside of two slots of the second U-shaped conductor of the first conductor set of the phase winding is 5, the pitch between the inside of two slots of the third U-shaped conductor of the second conductor set of the phase winding is 8, and the pitch between the inside of two slots of the fourth U-shaped conductor of the second conductor set of the phase winding is 6.

6. The stator according to claim 4, wherein the pitch between the inside of two slots of the first U-shaped conductor of the first conductor set of the phase winding is 7, the pitch between the inside of two slots of the second U-shaped conductor of the first conductor set of the phase winding is 5, the pitch between the inside of two slots of the third U-shaped conductor of the second conductor set of the phase winding is 6, and the pitch between the inside of two slots of the fourth U-shaped conductor of the second conductor set of the phase winding is 4.

7. The electric machine stator of claim 1, wherein each U-shaped conductor of each conductor set of each of the phase windings further comprises: one end of the stator core positioned outside the axial slots is connected with two welding ends inside the two slots;

one welding end of a first U-shaped conductor of one first conductor group and one welding end of a second U-shaped conductor of the other first conductor group in each phase winding along the circumferential direction of the stator core are connected with each other, and the pitch between the two welding ends connected with each other is a whole pitch; and/or one welding end of a first U-shaped conductor of one first conductor group and one welding end of a fourth U-shaped conductor of one second conductor group are connected with each other, and the pitch between the two welding ends connected with each other is the whole pitch; and/or one welding end of the second U-shaped conductor of one first conductor group and one welding end of the third U-shaped conductor of one second conductor group are connected with each other, and the pitch between the two welding ends connected with each other is the whole pitch.

8. The electric machine stator of claim 1, wherein the stator winding further comprises lead-out wires located at the radially outermost layer of the stator core and/or at the radially innermost layer of the stator core, the lead-out wires being located at the other end outside the axial slot of the stator core.

9. The electric machine stator according to claim 8, wherein two slot interiors of each U-shaped conductor of each conductor group of the phase winding that are located in the same radial direction of the outgoing lines are located in an nth layer and an N +1 th layer that are radially adjacent to the stator core, and two slot interiors of each U-shaped conductor of the other conductor groups of the phase winding are located in an nth layer and an N-1 th layer that are radially adjacent to the stator core, where N is an even number equal to or greater than 2.

10. The motor stator according to claim 8, wherein at least one U-shaped conductor is provided in any one of the nth layer and the N +1 th layer in the other circumferential region of the stator core, except for two slots of each U-shaped conductor of each conductor group of the phase winding in the same radial direction of the outgoing line, the N-th layer and the N +1 th layer being radially adjacent to the stator core, where N is an even number equal to or greater than 2.

11. An electrical machine comprising an electrical machine stator according to any one of claims 1 to 10.