CN113794294A

CN113794294A - Motor stator and motor

Info

Publication number: CN113794294A
Application number: CN202111213946.2A
Authority: CN
Inventors: 石旭东
Original assignee: Tianjin Songzheng Auto Parts Co ltd
Current assignee: Tianjin Songzheng Auto Parts Co ltd
Priority date: 2021-05-14
Filing date: 2021-10-18
Publication date: 2021-12-14

Abstract

The invention provides a motor stator and a motor, wherein each phase winding comprises K branch windings which are connected in series or in parallel, wherein K is an integer more than or equal to 1; each branch winding of each phase winding comprises: the coil unit positioned on the radial inner side of the stator core comprises 2 conductors connected in a parallel winding manner, and the pitch of at least one coil unit/K number of poles positioned on the radial inner side of the stator core in each phase winding is different from the pitch of at least one coil unit/K number of poles positioned on the radial outer side of the stator core in each phase winding; according to the technical scheme of the motor stator in the embodiment of the application, the bus bar and the bus bar which are connected in parallel between the windings of each phase in the related technology are omitted, heat dissipation is uniform, power and torque are improved, a wiring mode is simplified, complexity of a manufacturing process is reduced, production cost is reduced, and machining efficiency is improved.

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

The stator winding in the motor comprises a plurality of U-shaped conductors, the plurality of U-shaped conductors penetrate into a slot of a stator core according to a certain arrangement mode to form a three-phase winding of the required motor, a large number of bus bars and bus bars are required to be used for connecting each phase of winding in the prior art, the arrangement mode of the stator winding is complex, the forming is difficult, and the production cost is high; in order to realize high efficiency, miniaturization and integration of the motor, the flat wire motor adopts a flat wire conductor with a larger sectional area as a stator winding, although the advantages of high efficiency and high power density are brought to the motor. However, when the motor is operated at a high speed, the skin effect of the flat wire conductor near the notch becomes more obvious due to the high-frequency change of the magnetic field, and the eddy current loss generated thereby affects the operation performance of the motor.

Disclosure of Invention

The invention mainly aims to provide a motor stator and a motor, which reduce eddy current loss on a stator winding caused by skin effect through the arrangement of a conductor group in a slot, cancel a bus bar and a bus bar, simplify a wiring mode, further reduce the complexity of a manufacturing process, reduce the production cost and further improve the motor efficiency. In order to achieve the above object, according to one aspect of the present invention, there is provided a stator of an electric motor, comprising: 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;

the stator winding comprises a plurality of phase windings arranged on a stator core, and M layers are formed in the radial direction of the stator core, wherein M is an integer greater than or equal to 5;

each phase winding comprises K branch windings which are connected in series or in parallel, wherein K is an integer greater than or equal to 1; each branch winding of each phase winding comprises: the coil unit located on the radial inner side of the stator core comprises 2 conductors connected in a parallel winding mode, and the pitch of at least one coil unit/K number of poles located on the radial inner side of the stator core in each phase winding is different from the pitch of at least one coil unit/K number of poles located on the radial outer side of the stator core in each phase winding.

Further, when K equals 1, each phase winding is connected in series by a branch winding, and the branch winding of the phase winding comprises: the first coil unit is positioned on the radial inner side of the stator core, and the second coil unit is positioned on the radial outer side of the stator core;

when K equals 2, each phase winding is formed by connecting two branch windings in parallel, and the first branch winding of the phase winding comprises: be located the radial inboard third coil unit of stator core and be located the radial outside fourth coil unit of stator core, the second branch road winding of this phase winding includes: the fifth coil unit is positioned on the radial inner side of the stator core, and the sixth coil unit is positioned on the radial outer side of the stator core.

Further, when K is equal to 1, the pitch of the first coil unit located on the inner side in the radial direction of the stator core in the branch winding of each phase winding is different from the pitch of the second coil unit located on the outer side in the radial direction of the stator core.

Further, when K is equal to 2, the pitch of the coil unit located on the inner side in the radial direction of the stator core in each branch winding of each phase winding is the same as the pitch of the coil unit located on the outer side in the radial direction of the stator core, and the pitch of the third coil unit located on the inner side in the radial direction of the stator core in the first branch winding is different from the pitch of the sixth coil unit located on the outer side in the radial direction of the stator core in the second branch winding;

or when K is equal to 2, the pitch of the coil unit positioned on the radial inner side of the stator core in each branch winding of each phase winding is different from the pitch of the coil unit positioned on the radial outer side of the stator core, and the pitch of the third coil unit positioned on the radial inner side of the stator core in the first branch winding is the same as the pitch of the sixth coil unit positioned on the radial outer side of the stator core in the second branch winding;

or when K is equal to 2, the pitch of the coil unit located on the radial inner side of the stator core in each branch winding of each phase winding is different from the pitch of the coil unit located on the radial outer side of the stator core, and the pitch of the fourth coil unit located on the radial outer side of the stator core in the first branch winding is the same as the pitch of the sixth coil unit located on the radial outer side of the stator core in the second branch winding.

Furthermore, the pitch of the first coil unit of the branch winding is a long pitch, and the pitch of the second coil unit of the branch winding is a full pitch;

or the pitch of the first coil unit of each branch winding is a short pitch, and the pitch of the second coil unit of the branch winding is a full pitch;

or the pitch of one part of the first coil unit of each branch winding is a long pitch, the pitch of the other part of the first coil unit of each branch winding is a short pitch, and the pitch of the two coil units is a whole pitch.

Further, the pitch of the third coil unit of the first branch winding of the phase winding is a long pitch, the pitch of the fourth coil unit of the first branch winding of the phase winding is a short pitch, the pitch of the fifth coil unit of the second branch winding of the phase winding is a long pitch, and the pitch of the sixth coil unit of the second branch winding of the phase winding is a short pitch;

or the pitch of the third coil unit of the first branch winding of the phase winding is a short pitch, the pitch of the fourth coil unit of the first branch winding of the phase winding is a long pitch, the pitch of the fifth coil unit of the second branch winding of the phase winding is a long pitch, and the pitch of the sixth coil unit of the second branch winding of the phase winding is a short pitch;

or the pitch of the third coil unit of the first branch winding of the phase winding is a long pitch, the pitch of the fourth coil unit of the first branch winding of the phase winding is a short pitch, the pitch of the fifth coil unit of the second branch winding of the phase winding is a long pitch, and the pitch of the sixth coil unit of the second branch winding of the phase winding is a short pitch;

or the pitch of a part of the third coil units of the first branch winding of the phase winding is a long pitch and the pitch of the other part of the third coil units is a short pitch, the pitch of the fourth coil units of the first branch winding of the phase winding is a full pitch, the pitch of a part of the fifth coil units of the second branch winding of the phase winding is a long pitch and the pitch of the other part of the fifth coil units is a short pitch, and the pitch of the sixth coil units of the second branch winding of the phase winding is a full pitch;

or the pitch of the third coil unit of the first branch winding of the phase winding is a long pitch, the pitch of the fourth coil unit of the first branch winding of the phase winding is a long pitch, the pitch of the fifth coil unit of the second branch winding of the phase winding is a short pitch, and the pitch of the sixth coil unit of the second branch winding of the phase winding is a short pitch.

Further, 2 conductors of the coil unit located on the radial inner side of the stator core in each branch winding of each phase winding are arranged on 2 layers adjacent to each other in the radial direction of the stator core and are alternately arranged on the radial inner side of the stator core along the circumferential direction of the stator core.

Further, each branch winding of each phase winding further includes a seventh coil unit located at the middle position.

Further, the coil conductor located radially outside the stator core in each branch winding of each phase winding includes 2 conductors connected in parallel, or the coil unit conductor located radially outside the stator core in each branch winding of each phase winding is 1 conductor.

According to another aspect of the present invention, there is provided an electric machine comprising the electric machine stator described above.

By applying the technical scheme of the invention, the motor stator comprises: 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 a stator core and forming M layers in a radial direction of the stator core, wherein M is an integer greater than 5; each phase winding comprises K branch windings which are connected in series or in parallel, wherein K is an integer greater than or equal to 1; each branch winding of each phase winding comprises: the coil unit positioned on the radial inner side of the stator core comprises 2 conductors connected in a parallel winding manner, and the pitch of at least one coil unit/K number of poles positioned on the radial inner side of the stator core in each phase winding is different from the pitch of at least one coil unit/K number of poles positioned on the radial outer side of the stator core in each phase winding; according to the technical scheme of the motor stator in the embodiment of the application, the arrangement of the conductor group in the groove reduces the eddy current loss on the stator winding caused by the skin effect, the bus bar and the bus bar are eliminated, the wiring mode is simplified, the complexity of the manufacturing process is reduced, the production cost is reduced, and therefore the motor efficiency is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In the drawings:

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

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

FIG. 3 is a schematic plan view of a phase winding in accordance with an embodiment of the present invention;

FIG. 4 is a schematic plane development of a phase winding according to a second embodiment of the present invention;

FIG. 5 is a schematic plane development of a phase winding in a third embodiment of the present invention;

FIG. 6 is a schematic plane development of a phase winding in a fourth embodiment of the present invention;

FIG. 7-A is a schematic diagram of a planar development of a first branch winding of a phase winding in a fifth embodiment of the present invention;

fig. 7-B is a schematic plan-view development of a second branch winding of the phase winding in the fifth embodiment of the present invention;

fig. 8-a is a schematic plan-view development of a first branch winding of a phase winding in a sixth embodiment of the present invention;

fig. 8-B is a schematic plan development view of a second branch winding of the phase winding in the sixth embodiment of the present invention;

fig. 9-a is a schematic plan-view development of a first branch winding of a phase winding in the seventh embodiment of the present invention;

fig. 9-B is a schematic plan development view of a second branch winding of the phase winding in the seventh embodiment of the present invention;

fig. 10-a is a schematic plan-view development of a first branch winding of an eighth phase winding according to the embodiment of the present invention;

fig. 10-B is a schematic plan development view of a second branch winding of the phase winding in the eighth embodiment of the present invention;

fig. 11-a is a schematic plan development of a first leg winding of a phase winding in a ninth embodiment of the invention;

fig. 11-B is a schematic plan development view of a second branch winding of the phase winding in the ninth embodiment of the present invention;

FIG. 12-A is a schematic plan view of a first branch winding of a ten-phase winding according to an embodiment of the present invention;

fig. 12-B is a schematic plan development view of a second branch winding of a ten-phase winding according to an embodiment of the present invention;

FIG. 13-A is a schematic plan view of a first branch winding of an eleventh phase winding of an embodiment of the present invention;

fig. 13-B is a schematic plan development view of a second branch winding of an eleventh phase winding of the embodiment of the present invention;

fig. 14-a is a schematic plan-view development of a first branch winding of a phase winding in twelve embodiments of the present invention;

fig. 14-B is a schematic plan development view of a second branch winding of a twelve-phase winding according to 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.

The invention provides a motor stator. In the application, the pitch is the interval between the inner parts of two grooves of the same conductor along the circumferential direction, or the pitch is the sum of the span between the inner parts of the grooves corresponding to one welding end of one conductor and the span between the inner parts of the grooves corresponding to one welding end of the other conductor; note that the radially inner side of the stator core in this application is a side close to the central axis direction of the stator core.

Exemplarily, as shown in fig. 1, there is provided in an embodiment an electric motor stator including a stator core 20, the stator core 20 having a plurality of slots 21, the plurality of slots 21 being formed on a radially inner surface of the stator core 20 and being spaced apart at a predetermined slot pitch in a circumferential direction of the stator core 20.

Illustratively, as shown in fig. 1 to 14-B, the stator winding 10, which includes a plurality of phase windings mounted on the stator core 20 and is formed in 5 layers in the radial direction of the stator core 20, M is an integer greater than 5.

Referring to fig. 1 to 14-B, a stator winding 10 including a plurality of phase windings mounted on a stator core 20 so as to be different from each other in electrical phase and forming M layers in a radial direction of the stator core 20, in the present embodiment one to ten, the phase windings (U-phase winding or V-phase winding or W-phase winding) are formed into 5 layers in the radial direction of the stator core; in the eleventh to twelfth embodiments, M is 6 layers, but M may be an integer of 7, 8, or the like, which is greater than or equal to 5; the stator winding 10 is a three-phase (i.e., U-phase winding, V-phase winding, W-phase winding) winding, and each phase slot of each pole is equal to or equal to 2; each pole of the rotor is provided with 6 slots 21, the rotor has eight poles and is such that for each phase of the three-phase stator winding 10, the number of slots 21 provided in the stator core 20 is equal to 48 (i.e., 2X8X3), and further, in the present embodiment, the stator core 20 defines one tooth 22 by two adjacent slots 21, and the stator core 20 is formed by laminating a plurality of annular magnetic steel plates at both end faces in the axial direction of the stator core, and other conventional metal plates may be used instead of the magnetic steel plates.

Illustratively, as shown in fig. 3 to 14-B, each phase winding includes K branch windings connected in series or in parallel, where K is an integer equal to or greater than 1; each branch winding of each phase winding comprises: the coil unit located on the radial inner side of the stator core and the coil unit located on the radial outer side of the stator core are respectively provided with a coil unit located on the radial inner side of the stator core and a coil unit located on the radial outer side of the stator core, the coil unit located on the radial inner side of the stator core comprises 2 conductors connected in a parallel winding mode, and the pitch of the coil unit with at least one pole number/K located on the radial inner side of the stator core in each phase winding is different from the pitch of the coil unit with at least one pole number/K located on the radial outer side of the stator core in the phase winding.

With reference to fig. 3 to 6, in the first to fourth embodiments, each phase winding (U-phase winding, V-phase winding, W-phase winding) includes 1 serial branch, and with reference to fig. 7 to 14, in the fifth to twelfth embodiments, each phase winding (U-phase winding, V-phase winding, W-phase winding) includes 2 parallel branches; each branch winding of each phase winding comprises: a coil unit located at the radial inner side of the stator core and a coil unit located at the radial outer side of the stator core, wherein the coil unit located at the radial inner side of the stator core comprises 2 conductors, the 2 conductors are connected in parallel, specifically, with reference to fig. 3, in the first embodiment, one end of one conductor located at the radial 3 rd layer of the stator core is simultaneously connected to one end of the first conductor located at the inner coil unit of the radial 1 st layer 19 th slot of the stator core and one end of the second conductor located at the inner coil unit of the radial 2 nd layer 19 th slot of the stator core, and one end of the first conductor located at the inner coil unit of the radial 14 th slot of the radial 2 nd layer of the stator core and one end of the second conductor located at the inner coil unit of the radial 14 th slot of the radial 1 st layer of the stator core are simultaneously connected to one end of the other conductor located at the radial 3 rd layer of the stator core, that is, 2 conductors of the inner coil unit are connected in parallel; the number of poles in this embodiment is 8, K is 1 in the first to fourth embodiments, that is, the pitch of at least 8 coil units located on the radial inner side of the stator core in each phase winding is different from the pitch of at least 8 coil units located on the radial outer side of the stator core in the phase winding, and K is 2 in the fifth to twelfth embodiments, that is, the pitch of at least 8/2 (4) coil units located on the radial inner side of the stator core in each phase winding is different from the pitch of at least 8/2 (4) coil units located on the radial outer side of the stator core in the phase winding; according to the technical scheme of the motor stator in the embodiment of the application, the bus bars and the bus bars which are connected in series or in parallel between the windings of each phase in the related technology are eliminated, the heat dissipation is uniform, the power and the torque are improved, the wiring mode is simplified, the complexity of the manufacturing process is reduced, the production cost is reduced, and the processing efficiency is improved.

With reference to fig. 3 to 12-B, in the first to ninth embodiments, the cross sections of the conductors of the coil units located on the inner side in the radial direction of the stator core are the same, and the conductor cross sectional area of the coil units (100, 300, 500) located on the outer side in the radial direction of the stator core is 2 times larger than the conductor cross section of the coil units (200, 400, 600) located on the inner side in the radial direction of the stator core, so that the direct current resistance is reduced because the conductor cross sectional area of the coil units (100, 300, 500) located on the outer side in the radial direction of the stator core is increased relative to the conductor cross sectional area of the coil units (200, 400, 600) located on the inner side in the radial direction of the stator core.

Illustratively, as shown in fig. 3 to 6, in the first to fourth embodiments, when K is equal to 1, each phase winding is connected in series with a branch winding, and the branch winding of the phase winding includes: the first coil unit 200 is positioned on the radial inner side of the stator core, and the second coil unit 100 is positioned on the radial outer side of the stator core;

with reference to fig. 3 to 6, in the first to fourth embodiments, each phase winding is a branch winding connected in series, and the branch winding of the phase winding includes: 8 first coil units 200 located at the radial inner side of the stator core, and 8 second coil units 100 located at the radial outer side of the stator core;

further, as shown in fig. 3 to 6, in the first to fourth embodiments, when K is equal to 1, the pitch of the first coil unit 200 located on the inner side in the radial direction of the stator core in the branch winding of each phase winding is different from the pitch of the second coil unit 100 located on the outer side in the radial direction of the stator core.

Specifically, with reference to fig. 3 and 6, in the first and fourth embodiments, among the 8 first coil units 200 located at the radial inner side of the stator core in the branch winding of each phase winding, the first coil unit 200 is located at the 1 st slot and the 8 th slot of the 1 st layer and the 2 nd layer in the radial direction of the stator core, the second first coil unit 200 is located at the 2 nd slot and the 7 th slot of the 1 st layer and the 2 nd layer in the radial direction of the stator core, the third first coil unit 200 is located at the 13 th slot and the 20 th slot of the 1 st layer and the 2 nd layer in the radial direction of the stator core, the fourth first coil unit 200 is located at the 1 st slot and the 14 th slot and the 19 th slot of the 2 nd layer in the radial direction of the stator core, the fifth first coil unit 200 is located at the 25 th slot and the 32 th slot of the 1 st layer and the 2 nd layer in the radial direction of the stator core, and the sixth first coil unit 200 is located at the 1 st slot and the 26 th slot of the 2 nd layer in the radial direction of the stator core, The 31 st slot, the seventh first coil unit 200 is located in the 1 st slot and the 2 nd slot in the radial direction of the stator core, the 37 th slot and the 44 th slot in the 2 nd layer, the eighth first coil unit 200 is located in the 1 st slot and the 2 nd slot in the radial direction of the stator core, and the eighth first coil unit 200 is located in the 38 th slot and the 43 th slot in the radial direction of the stator core, and in 8 first coil units 200 located on the radial inner side of the stator core in the branch winding of the phase winding, the pitch of 4 first coil units 200 is a long pitch, and the pitch of 4 first coil units 200 is a short pitch; in the branch windings of each phase winding, among 8 second coil units 100 located on the radial outer side of the stator core, a first second coil unit 100 is located in the 1 st slot and the 7 th slot of the radial 5 th layer of the stator core, a second coil unit 100 is located in the 8 th slot and the 14 th slot of the radial 5 th layer of the stator core, a third second coil unit 100 is located in the 13 th slot and the 19 th slot of the radial 5 th layer of the stator core, a fourth second coil unit 100 is located in the 20 th slot and the 26 th slot of the radial 5 th layer of the stator core, a fifth second coil unit 100 is located in the 25 th slot and the 31 th slot of the radial 5 th layer of the stator core, a sixth second coil unit 100 is located in the 32 th slot and the 38 th slot of the radial 5 th layer of the stator core, a seventh second coil unit 100 is located in the 37 th slot and the 43 th slot of the radial 5 th layer of the stator core, an eighth second coil unit 100 is located in the 44 th slot and the radial 5 th layer of the stator core, The pitch of 8 second coil units 100 positioned at the radial outer side of the stator core in the branch winding of the phase winding is a full pitch; that is, the pitch (long pitch, short pitch) of the 8 first coil units 200 located at the inner side in the radial direction of the stator core in the branch winding of each phase winding is different from the pitch (full pitch) of the 8 second coil units 100 located at the outer side in the radial direction of the stator core.

With reference to fig. 4, specifically, in the second embodiment, among the 8 first coil units 200 located at the radial inner side of the stator core in the branch winding of each phase winding, the first coil unit 200 is located at the 2 nd slot and the 7 th slot of the first layer and the second layer in the radial direction of the stator core, the second first coil unit 200 is located at the 8 th slot and the 13 th slot of the first layer and the second layer in the radial direction of the stator core, the third first coil unit 200 is located at the 14 th slot and the 19 th slot of the first layer and the second layer in the radial direction of the stator core, the fourth first coil unit 200 is located at the 20 th slot and the 25 th slot of the first layer and the second layer in the radial direction of the stator core, the fifth first coil unit 200 is located at the 26 th slot and the 31 th slot of the first layer and the second layer in the radial direction of the stator core, the sixth first coil unit 200 is located at the 32 th slot and the 37 th slot of the first layer, and the seventh first coil unit 200 is located at the first layer and the first layer in the radial direction of the stator core, The 38 th slot, the 43 th slot of the second layer, the eighth first coil unit 200 are located in the first layer, the 44 th slot and the 1 st slot of the second layer in the radial direction of the stator core; the pitch of 8 first coil units 200 positioned at the radial inner side of the stator core in the branch winding of the phase winding is a short pitch; the branch windings of each phase winding are positioned in 8 second coil units 100 on the radial outer side of the stator core, the first second coil unit 100 is positioned in the 1 st slot and the 7 th slot of the radial fifth layer of the stator core, the second coil unit 100 is positioned in the 8 th slot and the 14 th slot of the radial fifth layer of the stator core, the third second coil unit 100 is positioned in the 13 th slot and the 19 th slot of the radial fifth layer of the stator core, the fourth second coil unit 100 is positioned in the 20 th slot and the 26 th slot of the radial fifth layer of the stator core, the fifth second coil unit 100 is positioned in the 25 th slot and the 31 th slot of the radial fifth layer of the stator core, the sixth second coil unit 100 is positioned in the 32 th slot and the 38 th slot of the radial fifth layer of the stator core, the seventh second coil unit 100 is positioned in the 37 th slot and the 43 th slot of the radial fifth layer of the stator core, and the eighth second coil unit 100 is positioned in the 44 th slot, the radial fifth layer of the stator core, The pitch of the 2 nd slot, i.e. the 8 second coil units 100 located at the radial inner side of the stator core in the branch winding of the phase winding, is a full pitch; that is, the pitch (short pitch) of the 8 first coil units 200 located at the inner side in the radial direction of the stator core in the branch winding of each phase winding is different from the pitch (full pitch) of the 8 second coil units 100 located at the outer side in the radial direction of the stator core.

With reference to fig. 5, specifically, in the third embodiment, among the 8 first coil units 200 located at the radial inner side of the stator core in the branch winding of each phase winding, the first coil unit 200 is located in the 1 st slot and the 8 th slot of the first layer and the second layer in the radial direction of the stator core, the second first coil unit 200 is located in the 7 th slot and the 14 th slot of the first layer and the second layer in the radial direction of the stator core, the third first coil unit 200 is located in the 13 th slot and the 20 th slot of the first layer and the second layer in the radial direction of the stator core, the fourth first coil unit 200 is located in the 19 th slot and the 26 th slot of the first layer and the second layer in the radial direction of the stator core, the fifth first coil unit 200 is located in the 25 th slot and the 32 th slot of the first layer and the second layer in the radial direction of the stator core, the sixth first coil unit 200 is located in the 31 th slot and the 38 th slot of the first layer, and the seventh first coil unit 200 is located in the radial direction of the first layer and the radial direction of the stator core, The 37 th slot, the 44 th slot of the second layer, the eighth first coil unit 200 are located in the first layer, the 43 th slot, the 2 nd slot of the second layer of the stator core radial direction; the pitch of 8 first coil units 200 positioned at the radial inner side of the stator core in the branch winding of the phase winding is a long pitch; each branch winding of each phase winding is positioned in 8 second coil units 100 on the radial outer side of the stator core, each branch winding comprises 8 second coil units 100, the first second coil unit 100 is positioned in the 1 st slot and the 7 th slot of the radial fifth layer of the stator core, the second coil unit 100 is positioned in the 8 th slot and the 14 th slot of the radial fifth layer of the stator core, the third second coil unit 100 is positioned in the 13 th slot and the 19 th slot of the radial fifth layer of the stator core, the fourth second coil unit 100 is positioned in the 20 th slot and the 26 th slot of the radial fifth layer of the stator core, the fifth second coil unit 100 is positioned in the 25 th slot and the 31 th slot of the radial fifth layer of the stator core, the sixth second coil unit 100 is positioned in the 32 th slot and the 38 th slot of the radial fifth layer of the stator core, and the seventh second coil unit 100 is positioned in the 37 th slot of the radial fifth layer of the stator core, The 43 th slot and the eighth second coil unit 100 are located in the 44 th slot and the 2 nd slot of the fifth layer in the radial direction of the stator core, that is, the pitch of the 8 second coil units 100 located on the radial inner side of the stator core in the branch winding of the phase winding is the whole pitch; that is, the pitch (long pitch) of the 8 first coil units 200 located at the inner side in the radial direction of the stator core in the branch winding of each phase winding is different from the pitch (full pitch) of the 8 second coil units 100 located at the outer side in the radial direction of the stator core.

For example, as shown in fig. 7-a to 14-B, in embodiment five to twelve, when K is equal to 2, each phase winding is formed by connecting two branch windings in parallel, and a first branch winding of the phase winding includes: a third coil unit 400 located at the radial inner side of the stator core and a fourth coil unit 300 located at the radial outer side of the stator core, and the second branch winding of the phase winding includes: a fifth coil unit 600 located at the inner side in the radial direction of the stator core, and a sixth coil unit 500 located at the outer side in the radial direction of the stator core.

With reference to fig. 7-a to 14-B, in embodiments five to twelve, each phase winding is formed by connecting two branch windings in parallel, and a first branch winding of the phase winding includes: 4 third coil units 400 located at the radial inner side of the stator core, and 4 fourth coil units 300 located at the radial outer side of the stator core, and the second branch winding of the phase winding includes: the number of the fifth coil units 600 is 4 at the inner side of the stator core in the radial direction, and the number of the sixth coil units 500 is 4 at the outer side of the stator core in the radial direction.

Illustratively, as shown in fig. 8-a, 8-B, 14-a, and 14-B, in sixth and twelfth embodiments, when K is equal to 2, the pitch of the coil unit 400(600) located at the inner side in the radial direction of the stator core in each branch winding of each phase winding is the same as the pitch of the coil unit 300(500) located at the outer side in the radial direction of the stator core, and the pitch of the third coil unit 400 located at the inner side in the radial direction of the stator core in the first branch winding is different from the pitch of the sixth coil unit 500 located at the outer side in the radial direction of the stator core in the second branch winding.

With reference to fig. 8-a, 8-B, 14-a, and 14-B, in the sixth and twelfth embodiments, the pitch of the coil unit 400(600) located at the inner side in the radial direction of the stator core in each branch winding of each phase winding is the same as the pitch of the coil unit 300(500) located at the outer side in the radial direction of the stator core, and specifically, with reference to fig. 8-a, in the sixth embodiment, the first third coil unit 400 located at the inner side in the radial direction of the stator core in the first branch winding of each phase winding is located at the 1 st slot, the 8 th slot of the first and second layers in the radial direction of the stator core, the second third coil unit 400 located at the inner side in the radial direction of the stator core in the branch winding is located at the 13 th slot, the 20 th slot of the first and second layers in the radial direction of the stator core, and the third coil unit 400 located at the inner side in the radial direction of the branch winding is located at the first and second slots in the radial direction of the stator core, A 25 th slot and a 32 th slot in the second layer, wherein a fourth third coil unit 400 located at the radial inner side of the stator core in the branch winding is located at the radial first layer of the stator core, a 37 th slot and a 44 th slot in the second layer, the pitches of the 4 third coil units 400 located at the radial first layer of the stator core and the second layer in the branch winding are all long pitches, a first fourth coil unit 300 located at the radial outer side of the stator core in the first branch winding of each phase winding is located at the 1 st slot and the 8 th slot in the radial fifth layer of the stator core, a second fourth coil unit 300 located at the radial outer side of the stator core in the branch winding is located at the 13 th slot and the 20 th slot in the radial fifth layer of the stator core, a third coil unit 300 located at the radial outer side of the branch winding is located at the 25 th slot and the 32 th slot in the radial fifth layer of the stator core, and a fourth coil unit 300 located at the radial outer side of the branch winding is located at the radial fifth slot and the radial fourth coil unit 300 in the radial fourth layer of the radial fifth layer of the stator core The pitches of 4 fourth coil units 300 positioned at the fifth layer in the radial direction of the stator core in the branch winding are all long pitches; with reference to fig. 8-B, in the sixth embodiment, the first fifth coil unit 600 located at the radial inner side of the stator core in the second branch winding of each phase winding is located in the 2 nd slot and the 7 th slot of the first layer and the second layer in the radial direction of the stator core, the second fifth coil unit 600 located at the radial inner side of the stator core in the branch winding is located in the 14 th slot and the 19 th slot of the first layer and the second layer in the radial direction of the stator core, the third fifth coil unit 600 located at the radial inner side of the stator core in the branch winding is located in the 26 th slot and the 31 th slot of the first layer and the second layer in the radial direction of the stator core, the fourth fifth coil unit 600 located at the radial inner side of the branch winding is located in the 38 th slot and the 43 th slot of the first layer and the second layer in the radial direction of the stator core, the pitches of the 4 fifth coil units 600 located at the first layer and the second layer in the radial direction of the branch winding are all short pitches, a first sixth coil unit 500 positioned at the radial outer side of the stator core in a second branch winding of each phase winding is positioned in the 2 nd slot and the 7 th slot of the radial fifth layer of the stator core, a second sixth coil unit 500 positioned at the radial outer side of the stator core in the branch winding is positioned in the 14 th slot and the 19 th slot of the radial fifth layer of the stator core, a third sixth coil unit 500 positioned at the radial outer side of the stator core in the branch winding is positioned in the 26 th slot and the 31 th slot of the radial fifth layer of the stator core, a fourth sixth coil unit 500 positioned at the radial outer side of the stator core in the branch winding is positioned in the 38 th slot and the 43 th slot of the radial fifth layer of the stator core, and the pitches of 4 sixth coil units 500 positioned at the radial fifth layer of the branch winding are short pitches; the pitch of the coil unit 400(600) located at the inner side in the radial direction of the stator core in each branch winding of each phase winding is the same as the pitch of the coil unit 300(500) located at the outer side in the radial direction of the stator core, and the pitch (long pitch) of the third coil unit 400 located at the inner side in the radial direction of the stator core in the first branch winding is different from the pitch (short pitch) of the sixth coil unit 500 located at the outer side in the radial direction of the stator core in the second branch winding; accordingly, the pitch (long pitch) of the fourth coil unit 300 located radially outside the stator core in the first branch winding is different from the pitch (short pitch) of the fifth coil unit 600 located radially inside the stator core in the second branch winding.

Exemplarily, in the fifth embodiment, when K is equal to 2, a pitch of a coil unit located at a radially inner side of a stator core in each branch winding of each phase winding is different from a pitch of a coil unit located at a radially outer side of the stator core, and a pitch 400 of a third coil unit located at a radially inner side of the stator core in the first branch winding is the same as a pitch of a sixth coil unit 500 located at a radially outer side of the stator core in the second branch winding, in combination with fig. 7-a and 7-B.

Specifically, in the fifth embodiment, referring to fig. 7-a and 7-B, in the first branch winding of each phase winding, the first third coil unit 400 located at the radially inner side of the stator core is located at the 2 nd slot and the 7 th slot of the first layer and the second layer in the radial direction of the stator core, the second third coil unit 400 located at the radially inner side of the stator core is located at the 14 th slot and the 19 th slot of the first layer and the second layer in the radial direction of the stator core, the third coil unit 400 located at the radially inner side of the stator core is located at the 26 th slot and the 31 th slot of the first layer and the second layer in the radial direction of the stator core, the fourth coil unit 400 located at the radially inner side of the stator core is located at the 38 th slot and the 43 th slot of the first layer and the second layer in the radial direction of the stator core, the pitch of the 4 third coil units 400 located at the first layer and the second layer in the radial direction of the branch winding is a short pitch, the first fourth coil unit 300 located at the radial outer side of the stator core in the first branch winding of each phase winding is located in the 1 st slot and the 8 th slot of the radial fifth layer of the stator core, the second coil unit 300 located at the radial outer side of the stator core in the branch winding is located in the 13 th slot and the 20 th slot of the radial fifth layer of the stator core, the third fourth coil unit 300 located at the radial outer side of the stator core in the branch winding is located in the 25 th slot and the 32 th slot of the radial fifth layer of the stator core, the fourth coil unit 300 located at the radial outer side of the stator core in the branch winding is located in the 37 th slot and the 44 th slot of the radial fifth layer of the stator core, the pitches of the 4 fourth coil units 300 located at the radial fifth layer of the stator core in the branch winding are all long pitches, that is, the pitch (short pitch) of the coil unit 400 located at the radial inner side of the stator core in each branch winding of each phase winding and the pitch of the coil unit 300 located at the radial outer side of the stator core in each phase winding (long pitch of the stator core (long pitch) Pitch) are different; with reference to fig. 7-B, in the fifth embodiment, the first fifth coil unit 600 located at the radial inner side of the stator core in the second branch winding of each phase winding is located at the 1 st slot and the 8 th slot of the first layer and the second layer in the radial direction of the stator core, the second fifth coil unit 600 located at the radial inner side of the stator core in the branch winding is located at the 13 th slot and the 20 th slot of the first layer and the second layer in the radial direction of the stator core, the third fifth coil unit 600 located at the radial inner side of the stator core in the branch winding is located at the 25 th slot and the 32 th slot of the first layer and the second layer in the radial direction of the stator core, the fourth fifth coil unit 600 located at the radial inner side of the stator core in the 37 th slot and the 44 th slot of the first layer and the second layer in the radial direction of the stator core, the pitch of the 4 fifth coil units 600 located at the first layer and the second layer in the radial direction of the branch winding is a long pitch, the first sixth coil unit 500 of the second branch winding of each phase winding, which is positioned at the radial outer side of the stator core, is positioned in the 2 nd and 7 th slots of the radial fifth layer of the stator core, the second sixth coil unit 500 of the branch winding, which is positioned at the radial outer side of the stator core, is positioned in the 14 th and 19 th slots of the radial fifth layer of the stator core, the third sixth coil unit 500 of the branch winding, which is positioned at the radial outer side of the stator core, is positioned in the 26 th and 31 th slots of the radial fifth layer of the stator core, the fourth sixth coil unit 500 of the branch winding, which is positioned at the radial outer side of the stator core, is positioned in the 38 th and 43 th slots of the radial fifth layer of the stator core, the pitches of the 4 sixth coil units 500 of the branch winding, which are all short pitches, and the pitch of the coil unit of each branch winding, which is positioned at the radial inner side of the stator core (long pitch) and the pitch of the coil unit positioned at the radial outer side of the stator core (short pitch) Different; that is, the pitch (short pitch) of the third coil unit 400 positioned at the inner side in the radial direction of the stator core in the first branch winding is the same as the pitch (short pitch) of the sixth coil unit 500 positioned at the outer side in the radial direction of the stator core in the second branch winding, and accordingly, the pitch (long pitch) of the fourth coil unit 300 positioned at the outer side in the radial direction of the stator core in the first branch winding is the same as the pitch (long pitch) of the fifth coil unit 600 positioned at the inner side in the radial direction of the stator core in the second branch winding.

For example, as shown in fig. 9-a to 12-B, in embodiment seven to embodiment ten, when K is equal to 2, the pitch of the coil unit located on the inner side in the stator core radial direction in each branch winding of each phase winding is different from the pitch of the coil unit located on the outer side in the stator core radial direction, and the pitch of the fourth coil unit 300 located on the outer side in the stator core radial direction in the first branch winding is the same as the pitch of the sixth coil unit 500 located on the outer side in the stator core radial direction in the second branch winding.

In conjunction with fig. 9-a, 9-B, 10-a, 10-B, 11-a, 11-B, 12-a, 12-B, in an embodiment seventh to tenth, a pitch of the coil unit 400(600) located at the inner side in the radial direction of the stator core in each branch winding of each phase winding is different from a pitch of the coil unit 300(500) located at the outer side in the radial direction of the stator core, and specifically, in conjunction with fig. 9-a, in an embodiment seventh, a first third coil unit 400 located at the inner side in the radial direction of the stator core in a first branch winding of each phase winding is located at the 2 nd slot, the 7 th slot of the first layer, the second coil unit 400 located at the inner side in the radial direction of the stator core in the branch winding is located at the 14 th slot, the 19 th slot of the first layer, the second layer, the third coil unit 400 located at the radial inner side of the stator core in the branch winding is located at the radial first layer, the 26 th groove and the 31 th groove of the second layer of the stator core, the fourth third coil unit 400 located at the radial inner side of the stator core in the branch winding is located at the radial first layer, the 38 th groove and the 43 th groove of the radial first layer, the radial second layer and the radial second layer of the stator core in the branch winding, the first fourth coil unit 300 located at the radial outer side of the stator core in the first branch winding of each phase winding is located at the 1 st groove and the 8 th groove of the radial fifth layer of the stator core, the second fourth coil unit 300 located at the radial outer side of the stator core in the branch winding is located at the 13 th groove and the 20 th groove of the radial fifth layer of the stator core, the third coil unit 300 located at the radial outer side of the branch winding is located at the 25 th groove and the radial fifth layer of the stator core, A 32 th slot, in which a fourth coil unit 300 located at the radial outer side of the stator core in the branch winding is located at the 37 th slot and the 44 th slot of the radial fifth layer of the stator core, and the pitches of 4 fourth coil units 300 located at the radial fifth layer of the stator core in the branch winding are all long pitches, that is, the pitch (short pitch) of the coil unit 400 located at the radial inner side of the stator core in each branch winding of each phase winding is different from the pitch (long pitch) of the coil unit 300 located at the radial outer side of the stator core; with reference to fig. 9-B, in the seventh embodiment, the first fifth coil unit 600 located at the radial inner side of the stator core in the second branch winding of each phase winding is located at the 8 th slot and the 13 th slot of the first layer and the second layer in the radial direction of the stator core, the second fifth coil unit 600 located at the radial inner side of the stator core in the branch winding is located at the 20 th slot and the 25 th slot of the first layer and the second layer in the radial direction of the stator core, the third fifth coil unit 600 located at the radial inner side of the stator core in the branch winding is located at the 32 th slot and the 37 th slot of the first layer and the second layer in the radial direction of the stator core, the fourth fifth coil unit 600 located at the radial inner side of the stator core in the 44 th slot and the 1 st slot of the first layer and the second layer in the radial direction of the stator core in the branch winding, the pitches of the 4 fifth coil units 600 located at the first layer and the second layer in the radial direction of the stator core in the branch winding are short pitches, the first sixth coil unit 500 of the second branch winding of each phase winding, which is located at the radial outer side of the stator core, is located in the 7 th slot and the 14 th slot of the radial fifth layer of the stator core, the second sixth coil unit 500 of the branch winding, which is located at the radial outer side of the stator core, is located in the 19 th slot and the 26 th slot of the radial fifth layer of the stator core, the third sixth coil unit 500 of the branch winding, which is located at the radial outer side of the stator core, is located in the 31 st slot and the 38 th slot of the radial fifth layer of the stator core, the fourth sixth coil unit 500 of the branch winding, which is located at the radial outer side of the stator core, is located in the 43 rd slot and the 2 nd slot of the radial fifth layer of the stator core, the pitches of the 4 sixth coil units 500 of the branch winding, which are all long pitches, and the pitch (short pitch) of the coil unit 600 of each branch winding of each phase winding, which is located at the radial inner side of the stator core, and the pitch (long pitch) of the coil unit 500 located at the radial outer side of the stator core are all long pitch Distance) are different; that is, the pitch (long pitch) of the fourth coil unit 300 positioned at the outer side in the radial direction of the stator core in the first branch winding is the same as the pitch (long pitch) of the sixth coil unit 500 positioned at the outer side in the radial direction of the stator core in the second branch winding.

Specifically, referring to fig. 10-a, in the eighth embodiment, the first third coil unit 400 located at the radially inner side of the stator core in the first branch winding of each phase winding is located at the 7 th slot and the 14 th slot of the first layer and the second layer in the radial direction of the stator core, the second third coil unit 400 located at the radially inner side of the stator core in the branch winding is located at the 19 th slot and the 26 th slot of the first layer and the second layer in the radial direction of the stator core, the third coil unit 400 located at the radially inner side of the stator core in the branch winding is located at the 31 st slot and the 38 th slot of the first layer and the second layer in the radial direction of the stator core, the fourth coil unit 400 located at the radially inner side of the stator core in the radial direction of the first layer, the 43 rd slot and the 2 nd slot of the stator core in the branch winding, the pitches of the 4 third coil units 400 located at the radially first layer and the second layer in the radial direction of the stator core are all long pitches, the first fourth coil unit 300 located at the radial outer side of the stator core in the first branch winding of each phase winding is located in the 8 th slot and the 13 th slot of the radial fifth layer of the stator core, the second coil unit 300 located at the radial outer side of the stator core in the branch winding is located in the 20 th slot and the 25 th slot of the radial fifth layer of the stator core, the third fourth coil unit 300 located at the radial outer side of the stator core in the branch winding is located in the 32 th slot and the 37 th slot of the radial fifth layer of the stator core, the fourth coil unit 300 located at the radial outer side of the stator core in the branch winding is located in the 44 th slot and the 1 st slot of the radial fifth layer of the stator core, the pitches of the 4 fourth coil units 300 located at the radial fifth layer of the stator core in the branch winding are all short pitches, that is, the pitch (long pitch) of the coil unit 400 located at the radial inner side of the stator core in each branch winding of each phase winding and the pitch of the coil unit 300 located at the radial outer side of the stator core in each phase winding (short pitch of the stator core (short pitch) Pitch) are different; with reference to fig. 10-B, in the eighth embodiment, the first fifth coil unit 600 located at the radial inner side of the stator core in the second branch winding of each phase winding is located at the 1 st slot and the 8 th slot of the first layer and the second layer in the radial direction of the stator core, the second fifth coil unit 600 located at the radial inner side of the stator core in the branch winding is located at the 13 th slot and the 20 th slot of the first layer and the second layer in the radial direction of the stator core, the third fifth coil unit 600 located at the radial inner side of the stator core in the branch winding is located at the 25 th slot and the 32 th slot of the first layer and the second layer in the radial direction of the stator core, the fourth fifth coil unit 600 located at the radial inner side of the stator core in the first layer, the 37 th slot and the 44 th slot in the radial direction of the stator core in the branch winding, and the pitches of the 4 fifth coil units 600 located at the first layer and the second layer in the radial direction of the stator core are all long pitches, the first sixth coil unit 500 of the second branch winding of each phase winding, which is located at the radial outer side of the stator core, is located in the 2 nd slot and the 7 th slot of the radial fifth layer of the stator core, the second sixth coil unit 500 of the branch winding, which is located at the radial outer side of the stator core, is located in the 14 th slot and the 19 th slot of the radial fifth layer of the stator core, the third sixth coil unit 500 of the branch winding, which is located at the radial outer side of the stator core, is located in the 26 th slot and the 31 th slot of the radial fifth layer of the stator core, the fourth sixth coil unit 500 of the branch winding, which is located at the radial outer side of the stator core, is located in the 38 th slot and the 43 th slot of the radial fifth layer of the stator core, the pitches of the 4 sixth coil units 500 of the branch winding, which are all short pitches, and the pitch (long pitch) of the coil unit 400(600) of each branch winding, which is located at the radial inner side of the stator core, and the coil unit 300(500) located at the radial outer side of the stator core are located in each branch winding of each phase winding Are different in pitch (short pitch); that is, the pitch (short pitch) of the fourth coil unit 300 positioned at the radially outer side of the stator core in the first branch winding is the same as the pitch (short pitch) of the sixth coil unit 500 positioned at the radially outer side of the stator core in the second branch winding.

Specifically, referring to fig. 11-a, in the ninth embodiment, the first third coil unit 400 located at the radial inner side of the stator core in the first branch winding of each phase winding is located at the 1 st slot and the 8 th slot of the first layer and the second layer in the radial direction of the stator core, the second third coil unit 400 located at the radial inner side of the stator core in the branch winding is located at the 14 th slot and the 19 th slot of the first layer and the second layer in the radial direction of the stator core, the third coil unit 400 located at the radial inner side of the stator core in the branch winding is located at the 25 th slot and the 32 th slot of the first layer and the second layer in the radial direction of the stator core, the fourth third coil unit 400 located at the radial inner side of the stator core in the radial first layer, the 38 th slot and the 43 th slot of the stator core, the first pitch and the third coil unit 400 located at the radial first layer, the second layer in the radial direction of the stator core in the branch winding are all long pitches, the pitches of the second and fourth third coil units 400 located at the first and second radial layers of the stator core in the branch winding are short pitches, the first fourth coil unit 300 located at the radial outer side of the stator core in the first branch winding of each phase winding is located at the 1 st and 7 th slots of the fifth radial layer of the stator core, the second fourth coil unit 300 located at the radial outer side of the stator core in the branch winding is located at the 14 th and 20 th slots of the fifth radial layer of the stator core, the third fourth coil unit 300 located at the radial outer side of the stator core in the branch winding is located at the 25 th and 31 th slots of the fifth radial layer of the stator core, the fourth coil unit 300 located at the radial outer side of the stator core in the branch winding is located at the 38 th and 44 th slots of the fifth radial layer of the stator core, the pitches of the 4 fourth coil units 300 located at the fifth radial layer of the stator core in the branch winding are all full pitches, that is, the pitch (short pitch, long pitch) of the coil unit 400 located at the inner side in the radial direction of the stator core in each branch winding of each phase winding is different from the pitch (full pitch) of the coil unit 300 located at the outer side in the radial direction of the stator core; with reference to fig. 11-B, in the ninth embodiment, a first fifth coil unit 600 located at the radial inner side of the stator core in the second branch winding of each phase winding is located at the 2 nd slot and the 7 th slot of the first layer and the second layer in the radial direction of the stator core, a second fifth coil unit 600 located at the radial inner side of the stator core in the branch winding is located at the 13 th slot and the 20 th slot of the first layer and the second layer in the radial direction of the stator core, a third fifth coil unit 600 located at the radial inner side of the stator core in the branch winding is located at the 26 th slot and the 31 th slot of the first layer and the second layer in the radial direction of the stator core, a fourth fifth coil unit 600 located at the radial inner side of the stator core in the first layer, the 37 th slot and the 44 th slot in the radial direction of the stator core, and the pitches of the first coil unit 600, the first coil unit and the third coil unit 600 in the radial direction of the first layer, the second layer and the branch winding are short pitches, the pitches of the second and fourth fifth coil units 600 in the first and second layers of the stator core in the radial direction of the branch winding are long pitches, the first sixth coil unit 500 in the second branch winding of each phase winding, which is positioned at the radial outer side of the stator core, is positioned in the 2 nd and 8 th slots of the fifth layer of the stator core in the radial direction of the stator core, the second sixth coil unit 500 in the branch winding, which is positioned at the radial outer side of the stator core, is positioned in the 13 th and 19 th slots of the fifth layer of the stator core in the radial direction, the third sixth coil unit 500 in the branch winding, which is positioned at the radial outer side of the stator core, is positioned in the 26 th and 32 th slots of the fifth layer of the stator core in the radial direction, the fourth coil unit 500 in the branch winding, which is positioned at the 37 th and 43 th slots of the fifth layer of the stator core in the radial direction, and the pitches of the 4 sixth coil units 500 in the branch winding, which are positioned at the fifth layer of the stator core in the radial direction, are all integral pitches, the pitch (short pitch, long pitch) of the coil unit 600 located at the inner side in the radial direction of the stator core in each branch winding of each phase winding is different from the pitch (full pitch) of the coil unit 500 located at the outer side in the radial direction of the stator core; that is, the pitch (full pitch) of the fourth coil unit 300 positioned at the outer side in the radial direction of the stator core in the first branch winding is the same as the pitch (full pitch) of the sixth coil unit 500 positioned at the outer side in the radial direction of the stator core in the second branch winding.

Specifically, referring to fig. 12-a, in the tenth embodiment, the first third coil unit 400 located at the radially inner side of the stator core in the first branch winding of each phase winding is located at the first, second, and 7 nd slots in the radial direction of the stator core, the second third coil unit 400 located at the radially inner side of the stator core in the branch winding is located at the first, second, and 13 th slots, and 20 th slots in the radial direction of the stator core, the third coil unit 400 located at the radially inner side of the stator core in the branch winding is located at the first, second, and 26 th slots, and 31 th slots in the radial direction of the stator core, the fourth third coil unit 400 located at the radially inner side of the stator core in the branch winding is located at the first, 37 th, and 44 th slots in the radial direction of the stator core, the pitch of the second and fourth coil units 400 located at the first, second, and fourth layers in the radial direction of the stator core is a long pitch, the first and third coil units 400 in the first branch winding of each phase winding are short-pitch, the first and third coil units 300 in the first branch winding of each phase winding are located at the 1 st and 7 th slots of the fifth layer of the stator core, the second and fourth coil units 300 in the branch winding are located at the 14 th and 20 th slots of the fifth layer of the stator core, the third and fourth coil units 300 in the branch winding are located at the 25 th and 31 th slots of the fifth layer of the stator core, the fourth coil units 300 in the branch winding are located at the 38 th and 44 th slots of the fifth layer of the stator core, the pitches of the 4 fourth coil units 300 in the branch winding are all full-pitch, that is, the pitch (long pitch, short pitch) of the coil unit 400 located at the inner side in the radial direction of the stator core in each branch winding of each phase winding is different from the pitch (full pitch) of the coil unit 300 located at the outer side in the radial direction of the stator core; in the tenth embodiment, referring to fig. 12-B, the first fifth coil unit 600 located at the radial inner side of the stator core in the second branch winding of each phase winding is located at the 1 st slot and the 8 th slot of the first layer and the second layer in the radial direction of the stator core, the second fifth coil unit 600 located at the radial inner side of the stator core in the branch winding is located at the 14 th slot and the 19 th slot of the first layer and the second layer in the radial direction of the stator core, the third fifth coil unit 600 located at the radial inner side of the stator core in the branch winding is located at the 25 th slot and the 32 th slot of the first layer and the second layer in the radial direction of the stator core, the fourth fifth coil unit 600 located at the radial inner side of the stator core in the 38 th slot and the 43 th slot of the first layer and the second layer in the radial direction of the stator core in the branch winding, and the pitch of the second coil unit 600 located at the first layer, the second layer and the fourth coil unit 600 in the radial direction of the stator core is short pitch, the first and third fifth coil units 600 in the first and third layers of the branch winding are long pitch, the first and third sixth coil units 500 in the second branch winding of each phase winding are located in the 2 nd and 8 th slots of the fifth layer of the stator core, the second and third coil units 500 in the branch winding are located in the 13 th and 19 th slots of the fifth layer of the stator core, the third and fourth coil units 500 in the branch winding are located in the 26 th and 32 th slots of the fifth layer of the stator core, the fourth and third coil units 500 in the branch winding are located in the 37 th and 43 th slots of the fifth layer of the stator core, the pitches of the 4 sixth coil units 500 in the branch winding are all full pitch, the pitch (long pitch, short pitch) of the coil unit 600 located at the inner side in the radial direction of the stator core in each branch winding of each phase winding is different from the pitch (full pitch) of the coil unit 500 located at the outer side in the radial direction of the stator core; that is, the pitch (full pitch) of the fourth coil unit 300 positioned at the outer side in the radial direction of the stator core in the first branch winding is the same as the pitch (full pitch) of the sixth coil unit 500 positioned at the outer side in the radial direction of the stator core in the second branch winding.

For example, as shown in fig. 1 to 14-B, in the embodiment, 2 conductors of the coil unit located at the radially inner side of the stator core in each branch winding of each phase winding are disposed at 2 layers adjacent to each other in the radial direction of the stator core and alternately disposed at the radially inner side of the stator core in the circumferential direction of the stator core.

With reference to fig. 1 to 14-B, in the first, third, and fourth embodiments of the present invention, the first conductor of the first coil unit 200 located at the radial inner side of the stator core is located in the 1 st slot of the first layer and the 8 th slot of the second layer in the radial direction of the stator core, and the second conductor of the first coil unit 200 is located in the 1 st slot of the second layer and the 8 th slot of the first layer in the radial direction of the stator core, that is, 2 conductors of the first coil unit 200 located at the radial inner side of the stator core are provided with the first layer and the second layer in the radial direction of the stator core, and are alternately provided with the first layer and the second layer in the radial direction of the stator core along the circumferential direction of the stator core; in the second embodiment, the first conductor of the first coil unit 200 located at the radial inner side of the stator core is located in the 2 nd slot of the first layer and the 7 th slot of the second layer in the radial direction of the stator core, and the second conductor of the first coil unit 200 is located in the 2 nd slot of the second layer and the 7 th slot of the first layer in the radial direction of the stator core, that is, the 2 conductors of the first coil unit 200 located at the radial inner side of the stator core are arranged in the first layer and the second layer in the radial direction of the stator core and are alternately arranged in the first layer and the second layer in the radial direction of the stator core along the circumferential direction of the stator core; in the fifth embodiment, the first conductor of the third coil unit 400 located at the radial inner side of the stator core is located at the 2 nd slot of the first layer and the 7 th slot of the second layer in the radial direction of the stator core, and the second conductor of the third coil unit 400 is located at the 2 nd slot of the second layer and the 7 th slot of the first layer in the radial direction of the stator core, that is, the 2 conductors of the third coil unit 400 located at the radial inner side of the stator core are provided with the first layer and the second layer in the radial direction of the stator core and are alternately provided with the first layer and the second layer in the radial direction of the stator core along the circumferential direction of the stator core; the first conductor of the fifth coil unit 600 located at the radial inner side of the stator core is located in the 1 st slot of the first layer and the 8 th slot of the second layer of the stator core, the second conductor of the fifth coil unit 600 is located in the 1 st slot of the second layer and the 8 th slot of the first layer of the stator core, that is, 2 conductors of the fifth coil unit 600 located at the radial inner side of the stator core are provided with the first layer and the second layer of the stator core in the radial direction and are alternately arranged with the first layer and the second layer of the stator core in the radial direction along the circumferential direction of the stator core; in the sixth embodiment, referring to fig. 8-a, the first conductor of the third coil unit 400 located at the radially inner side of the stator core is located in the 1 st slot of the first layer and the 8 th slot of the second layer in the radial direction of the stator core, and the second conductor of the third coil unit 400 is located in the 1 st slot of the second layer and the 8 th slot of the first layer in the radial direction of the stator core, that is, the 2 conductors of the third coil unit 400 located at the radially inner side of the stator core are arranged in the first layer and the second layer in the radial direction of the stator core and are alternately arranged in the first layer and the second layer in the radial direction of the stator core along the circumferential direction of the stator core; with reference to fig. 8-B, the first conductor of the fifth coil unit 600 located at the radial inner side of the stator core is located in the 2 nd slot of the first layer and the 7 th slot of the second layer of the stator core, and the second conductor of the fifth coil unit 600 is located in the 2 nd slot of the second layer and the 7 th slot of the first layer of the stator core, that is, the 2 conductors of the fifth coil unit 600 located at the radial inner side of the stator core are located in the first layer and the second layer of the stator core, and are alternately located in the first layer and the second layer of the stator core along the circumferential direction of the stator core; in the seventh embodiment, referring to fig. 9-a, the first conductor of the third coil unit 400 located at the radially inner side of the stator core is located in the 2 nd slot of the first layer and the 7 th slot of the second layer in the radial direction of the stator core, and the second conductor of the third coil unit 400 is located in the 2 nd slot of the second layer and the 7 th slot of the first layer in the radial direction of the stator core, that is, the 2 conductors of the third coil unit 400 located at the radially inner side of the stator core are located in the first layer and the second layer in the radial direction of the stator core and are alternately located in the first layer and the second layer in the radial direction of the stator core along the circumferential direction of the stator core; with reference to fig. 9-B, the first conductor of the fifth coil unit 600 located at the radial inner side of the stator core is located in the 8 th slot of the first layer and the 13 th slot of the second layer of the stator core, and the second conductor of the fifth coil unit 600 is located in the 8 th slot of the second layer and the 13 th slot of the first layer of the stator core, that is, 2 conductors of the fifth coil unit 600 located at the radial inner side of the stator core are located in the first layer and the second layer of the stator core, and are alternately located in the first layer and the second layer of the stator core along the circumferential direction of the stator core; in the eighth embodiment, referring to fig. 10-a, the first conductor of the third coil unit 400 located at the radially inner side of the stator core is located in the 2 nd slot of the first layer and the 7 th slot of the second layer in the radial direction of the stator core, and the second conductor of the third coil unit 400 is located in the 2 nd slot of the second layer and the 7 th slot of the first layer in the radial direction of the stator core, that is, the 2 conductors of the third coil unit 400 located at the radially inner side of the stator core are located in the first layer and the second layer in the radial direction of the stator core and are alternately located in the first layer and the second layer in the radial direction of the stator core along the circumferential direction of the stator core; with reference to fig. 10-B, the first conductor of the fifth coil unit 600 located at the radial inner side of the stator core is located in the 1 st slot of the first layer and the 8 th slot of the second layer of the stator core, and the second conductor of the fifth coil unit 600 is located in the 1 st slot of the second layer and the 8 th slot of the first layer of the stator core, that is, 2 conductors of the fifth coil unit 600 located at the radial inner side of the stator core are located in the first layer and the second layer of the stator core, and are alternately located in the first layer and the second layer of the stator core along the circumferential direction of the stator core; in example nine, with reference to fig. 11-a, the first conductor of the third coil unit 400 located at the radially inner side of the stator core is located in the 1 st slot of the first layer and the 8 th slot of the second layer in the radial direction of the stator core, and the second conductor of the third coil unit 400 is located in the 1 st slot of the second layer and the 8 th slot of the first layer in the radial direction of the stator core, that is, the 2 conductors of the third coil unit 400 located at the radially inner side of the stator core are arranged in the first layer and the second layer in the radial direction of the stator core and are alternately arranged in the first layer and the second layer in the radial direction of the stator core along the circumferential direction of the stator core; with reference to fig. 11-B, the first conductor of the fifth coil unit 600 located at the radial inner side of the stator core is located in the 2 nd slot of the first layer and the 7 th slot of the second layer of the stator core, and the second conductor of the fifth coil unit 600 is located in the 2 nd slot of the second layer and the 7 th slot of the first layer of the stator core, that is, the 2 conductors of the fifth coil unit 600 located at the radial inner side of the stator core are located in the first layer and the second layer of the stator core, and are alternately located in the first layer and the second layer of the stator core along the circumferential direction of the stator core; in the tenth embodiment, referring to fig. 12-a, the first conductor of the third coil unit 400 located at the radially inner side of the stator core is located in the 2 nd slot of the first layer and the 7 th slot of the second layer in the radial direction of the stator core, and the second conductor of the third coil unit 400 is located in the 2 nd slot of the second layer and the 7 th slot of the first layer in the radial direction of the stator core, that is, the 2 conductors of the third coil unit 400 located at the radially inner side of the stator core are located in the first layer and the second layer in the radial direction of the stator core and are alternately located in the first layer and the second layer in the radial direction of the stator core along the circumferential direction of the stator core; with reference to fig. 12-B, the first conductor of the fifth coil unit 600 located at the radial inner side of the stator core is located in the 1 st slot of the first layer and the 8 th slot of the second layer of the stator core, and the second conductor of the fifth coil unit 600 is located in the 1 st slot of the second layer and the 8 th slot of the first layer of the stator core, that is, 2 conductors of the fifth coil unit 600 located at the radial inner side of the stator core are arranged in the first layer and the second layer of the stator core and are alternately arranged in the first layer and the second layer of the stator core along the circumferential direction of the stator core; in the eleventh embodiment, referring to fig. 13-a, the first conductor of the third coil unit 400 located at the radially inner side of the stator core is located in the 2 nd slot of the first layer and the 7 th slot of the second layer in the radial direction of the stator core, and the second conductor of the third coil unit 400 is located in the 2 nd slot of the second layer and the 7 th slot of the first layer in the radial direction of the stator core, that is, the 2 conductors of the third coil unit 400 located at the radially inner side of the stator core are located in the first layer and the second layer in the radial direction of the stator core and are alternately located in the first layer and the second layer in the radial direction of the stator core along the circumferential direction of the stator core; with reference to fig. 13-B, the first conductor of the fifth coil unit 600 located at the radial inner side of the stator core is located in the 1 st slot of the first layer and the 8 th slot of the second layer of the stator core, and the second conductor of the fifth coil unit 600 is located in the 1 st slot of the second layer and the 8 th slot of the first layer of the stator core, that is, 2 conductors of the fifth coil unit 600 located at the radial inner side of the stator core are arranged in the first layer and the second layer of the stator core and are alternately arranged in the first layer and the second layer of the stator core along the circumferential direction of the stator core; in the twelfth embodiment, referring to fig. 14-a, the first conductor of the third coil unit 400 located at the radially inner side of the stator core is located in the 1 st slot of the first layer and the 8 th slot of the second layer in the radial direction of the stator core, and the second conductor of the third coil unit 400 is located in the 1 st slot of the second layer and the 8 th slot of the first layer in the radial direction of the stator core, that is, the 2 conductors of the third coil unit 400 located at the radially inner side of the stator core are arranged in the first layer and the second layer in the radial direction of the stator core and are alternately arranged in the first layer and the second layer in the radial direction of the stator core along the circumferential direction of the stator core; with reference to fig. 14-B, the first conductor of the fifth coil unit 600 located at the radial inner side of the stator core is located in the 2 nd slot of the first layer and the 7 th slot of the second layer of the stator core, and the second conductor of the fifth coil unit 600 is located in the 2 nd slot of the second layer and the 7 th slot of the first layer of the stator core, that is, the 2 conductors of the fifth coil unit 600 located at the radial inner side of the stator core are disposed in the first layer and the second layer of the stator core, and are alternately disposed in the first layer and the second layer of the stator core along the circumferential direction of the stator core.

In particular, in the embodiment, with reference to fig. 1 to 14-B, each branch winding of each phase winding further includes a seventh coil unit 700 located at the 3 rd and 4 th radial layers of the stator core, one welding end of the seventh coil unit in each branch winding is connected to the coil unit located at the radially inner side of the stator core, and the other welding end of the seventh coil unit is connected to the coil unit located at the radially outer side of the stator core, when M is equal to 7 layers, the middle position includes the seventh coil unit 700 located at the 3 rd and 4 th radial layers of the stator core, and the seventh coil unit 700 located at the 5 th and 6 th radial layers of the stator core, and when M is equal to 7 layers, one welding end of the seventh coil unit 700 located at the 3 rd and 4 th radial layers of the stator core is connected to the coil unit located at the radially inner side of the stator core, and the other welding end of the seventh coil unit 700 located at the 3 rd and 4 th radial layers of the stator core is connected to the 5 th radial layer of the stator core, One welding end of the seventh coil unit 700 of the 6 th layer is connected to one welding end of the coil unit located at the radially outer side of the stator core at the other welding end of the seventh coil unit 700 of the 5 th and 6 th layers in the radial direction of the stator core.

Exemplarily, as shown in fig. 13-a to 14-B, in the eleventh embodiment, the coil unit located radially outside the stator core in each branch winding of each phase winding includes 2 conductors connected in parallel, as shown in fig. 3 to 12-B, and in the first to tenth embodiments, the coil unit conductor located radially outside the stator core in each branch winding of each phase winding is 1 conductor.

With reference to fig. 13-a, 13-B, 14-a and 14-B, in the eleventh and twelfth embodiments, the fourth coil unit 300 (sixth coil unit 500) located at the radial outer side of the stator core in each branch winding of each phase winding includes two conductors connected in parallel, specifically, one end of one conductor located at the radial 4 th layer of the stator core is simultaneously connected to one end of the first conductor located at the radial 5 th layer of the stator core, the outer coil unit of the 2 nd slot and one end of the second conductor located at the outer coil unit of the radial 6 th slot of the stator core, one end of the first conductor located at the outer coil unit of the 7 th slot of the radial 6 th layer of the stator core and one end of the second conductor located at the outer coil unit of the 7 th slot of the radial 5 th layer of the stator core are simultaneously connected to one end of the other conductor located at the radial 4 th layer of the stator core, that is, the 2 conductors of the outer coil unit are connected in parallel, in the eleventh embodiment, the first conductor of the two conductors of the fourth coil unit is located in the 2 nd slot of the 5 th layer in the radial direction of the stator core and the 7 th slot of the 6 th layer in the radial direction of the stator core, and the second conductor of the two conductors of the fourth coil unit is located in the 2 nd slot of the 6 th layer in the radial direction of the stator core and the 7 th slot of the 5 th layer in the radial direction of the stator core; in a twelfth embodiment, a first conductor of the two conductors of the fourth coil unit is located in the 2 nd slot of the 5 th layer in the radial direction of the stator core and the 7 th slot of the 5 th layer in the radial direction of the stator core, and a second conductor of the two conductors of the fourth coil unit is located in the 2 nd slot of the 6 th layer in the radial direction of the stator core and the 7 th slot of the 6 th layer in the radial direction of the stator core. As shown in fig. 3 to 12-B, in the first to tenth embodiments, the fourth coil unit 300 (sixth coil unit 500) located on the radially outer side of the stator core in each branch winding of each phase winding is a conductor located in a corresponding slot of the 5 th layer in the radial direction of the stator core.

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

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:

the method is characterized in that: a stator winding including a plurality of phase windings mounted on the stator core, and forming M layers in a radial direction of the stator core, where M is an integer greater than or equal to 5;

each phase winding comprises K branch windings which are connected in series or in parallel, wherein K is an integer greater than or equal to 1; each branch winding of each of the phase windings includes: the coil unit that is located stator core radial inside and be located stator core radial outside's coil unit, be located stator core radial inside's coil unit includes and winds 2 conductors of connection, every be located in the phase winding the radial inboard number of poles/K coil unit of stator core is different with the pitch that is located the radial outside number of poles/K coil unit of stator core in this phase winding.

2. The stator of claim 1, wherein when K is equal to 1, each of the phase windings is connected in series with a branch winding, the branch winding of the phase winding comprising: the first coil unit is positioned on the radial inner side of the stator core, and the second coil unit is positioned on the radial outer side of the stator core;

when K is equal to 2, each of the phase windings is formed by connecting two branch windings in parallel, and a first branch winding of the phase winding comprises: the third coil unit that is located the radial inboard of stator core and be located the radial outside fourth coil unit of stator core, the second branch road winding of this phase winding includes: and the sixth coil unit is positioned on the radial outer side of the stator core.

3. The motor stator according to claim 2, wherein when K is equal to 1, a pitch of a first coil unit located radially inside the stator core in the branch winding of each of the phase windings is different from a pitch of a second coil unit located radially outside the stator core.

4. The motor stator according to claim 2, wherein when K is equal to 2, a pitch of a coil unit located radially inside the stator core in each branch winding of each of the phase windings is the same as a pitch of a coil unit located radially outside the stator core, and a pitch of a third coil unit located radially inside the stator core in the first branch winding is different from a pitch of a sixth coil unit located radially outside the stator core in the second branch winding;

or when K is equal to 2, the pitch of the coil unit located on the radial inner side of the stator core in each branch winding of each phase winding is different from the pitch of the coil unit located on the radial outer side of the stator core, and the pitch of the third coil unit located on the radial inner side of the stator core in the first branch winding is the same as the pitch of the sixth coil unit located on the radial outer side of the stator core in the second branch winding;

5. The stator of claim 3, wherein the first coil unit of the branch winding has a long pitch, and the second coil unit of the branch winding has a full pitch;

or the pitch of one part of the first coil units of each branch winding is a long pitch, the pitch of the other part of the first coil units is a short pitch, and the pitch of the two coil units is a whole pitch.

6. The stator for an electric motor according to claim 4, wherein the pitch of the third coil unit of the first branch winding of the phase winding is a long pitch, the pitch of the fourth coil unit of the first branch winding of the phase winding is a short pitch, the pitch of the fifth coil unit of the second branch winding of the phase winding is a long pitch, and the pitch of the sixth coil unit of the second branch winding of the phase winding is a short pitch;

or the pitch of a part of third coil units of the first branch winding of the phase winding is a long pitch and the pitch of the other part of third coil units is a short pitch, the pitch of the fourth coil units of the first branch winding of the phase winding is a full pitch, the pitch of a part of fifth coil units of the second branch winding of the phase winding is a long pitch and the pitch of the other part of fifth coil units is a short pitch, and the pitch of the sixth coil units of the second branch winding of the phase winding is a full pitch;

7. The electric machine stator according to any one of claims 1 to 6, wherein the 2 conductors of the coil unit located radially inside the stator core in each branch winding of each phase winding are disposed in 2 layers radially adjacent to the stator core and alternately disposed radially inside the stator core in a circumferential direction of the stator core.

8. The stator for an electric motor according to any one of claims 1 to 6, wherein each branch winding of each phase winding further comprises a seventh coil unit located at a middle position.

9. The stator for an electric motor according to any one of claims 1 to 6, wherein the coil conductor located radially outside the stator core in each branch winding of each phase winding includes 2 conductors connected in parallel, or the coil unit conductor located radially outside the stator core in each branch winding of each phase winding is 1 conductor.

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