CN214543852U - Motor stator winding, motor stator and motor - Google Patents

Abstract

The utility model provides a motor stator winding, motor stator and motor, including coil assembly one and coil assembly two, coil assembly one sets gradually with coil assembly two along stator core's radial, and coil assembly one locates the radial same layer of stator core, and coil assembly one locates the innermost layer or outmost of stator core, and coil assembly two locates the radial adjacent two-layer of stator core; the first coil group comprises a plurality of first conductor groups and a plurality of second conductor groups, and at least one first conductor group and at least one second conductor group are arranged in at least one phase of the first coil group; the coil group II comprises a plurality of third conductor groups and a plurality of fourth conductor groups, and the third conductor groups and the fourth conductor groups are alternately arranged in adjacent slots of the stator core in a one-to-one mode. The beneficial effects of the utility model are that adopted complete symmetrical structure on magnetic circuit, eliminated because the loop current problem that asymmetrical structure produced, stator winding's conductor is U type conductor, simplifies manufacturing procedure, reduction in production cost improves machining efficiency.

Description

Motor stator winding, motor stator and motor

Technical Field

The utility model belongs to the technical field of the motor, especially, relate to a motor stator winding, motor stator and motor.

Background

In the prior art, a stator winding comprises various conductors, the various conductors comprise U-shaped conductors and S-shaped conductors, and coils of the various conductors penetrate into a slot of a stator core according to a certain arrangement mode to form the required winding of a single-phase motor or a multi-phase motor. The hairpin coils used in the prior art are various, the manufacturing process is complex, the production cost is high, and the processing efficiency is low.

Disclosure of Invention

In view of the above problem, the utility model provides a motor stator winding, motor stator and motor to solve above or other the former problem that prior art exists.

In order to solve the technical problem, the utility model discloses a technical scheme is: a motor stator winding comprises a first coil group and a second coil group, wherein the first coil group and the second coil group are sequentially arranged along the radial direction of a stator iron core; wherein the content of the first and second substances,

the first coil group comprises a plurality of first conductor groups and a plurality of second conductor groups, the first conductor groups and the second conductor groups are arranged along the circumferential direction of the stator core, and at least one phase of the first coil group comprises at least one first conductor group and at least one second conductor group;

the coil group II comprises a plurality of third conductor groups and a plurality of fourth conductor groups, the third conductor groups and the fourth conductor groups are arranged along the circumferential direction of the stator core, and the third conductor groups and the fourth conductor groups are alternately arranged in adjacent slots of the stator core in a one-to-one mode.

Further, the first conductor group comprises a first long-pitch conductor and a first short-pitch conductor, the first long-pitch conductor is arranged around the outer part of the first short-pitch conductor, the pitch of the first long-pitch conductor is 7, and the pitch of the first short-pitch conductor is 5;

the second conductor set includes two adjacently disposed first full-pitch conductors having a pitch of 6.

Further, the third conductor group comprises a second long-pitch conductor and a second short-pitch conductor, the second long-pitch conductor is arranged around the outside of the second short-pitch conductor, the pitch of the second long-pitch conductor is 7, and the pitch of the second short-pitch conductor is 5; the welding end part of the second long-pitch conductor and the welding end part of the second short-pitch conductor extend along the circumferential direction of the stator core, and the extending directions of the welding end parts of the second long-pitch conductor and the second short-pitch conductor are opposite;

the fourth conductor group comprises a third long-pitch conductor and a third short-pitch conductor, the third long-pitch conductor is arranged outside the third short-pitch conductor in a surrounding mode, the pitch of the third long-pitch conductor is 7, and the pitch of the third short-pitch conductor is 5;

the welding end of the third long-pitch conductor and the welding end of the third short-pitch conductor both extend in the same direction along the circumferential direction of the stator core, and the extending directions are the same.

Furthermore, the welding end part of the first long-pitch conductor, the welding end part of the first short-pitch conductor and the welding end part of the first full-pitch conductor extend in the same direction along the circumferential direction of the stator core, and the extending directions are the same; the extending direction of the welding end of the first long-pitch conductor is opposite to the extending direction of the welding end of the third long-pitch conductor.

Further, one welding end portion of the third long-pitch conductor and the inside of the groove connected to the welding end portion are located in the same layer, and the other welding end portion of the third long-pitch conductor and the inside of the groove connected to the welding end portion are not located in the same layer; one welding end portion of the third short-pitch conductor and the inside of the groove connected to the welding end portion are located in the same layer, and the other welding end portion of the third short-pitch conductor and the inside of the groove connected to the welding end portion are not located in the same layer.

Further, the stator winding further comprises at least one coil group III, the coil group III is arranged between the coil group I and the coil group II, the coil group III is arranged on two layers of the stator core which are adjacent in the radial direction, the coil group III comprises a plurality of third conductor groups, and the plurality of third conductor groups are arranged along the circumferential direction of the stator core.

The stator winding further comprises at least one coil group III, the coil group III is arranged between the coil group I and the coil group II, the coil group III is arranged on two layers of the stator core which are adjacent in the radial direction, the coil group III comprises a plurality of second full-pitch conductors, the plurality of second full-pitch conductors are arranged along the circumferential direction of the stator core, the welding end parts of the second full-pitch conductors extend along the circumferential direction of the stator core, and the extending directions of the second full-pitch conductors and the second full-pitch conductors are opposite; the second full-pitch conductor has a pitch of 6.

Furthermore, the number of radial layers of the stator core is an odd number of layers which is more than or equal to 3, and at least two branches in any phase winding of the stator winding are connected in parallel; in the stator winding, the pitch between the two welded ends that are welded is a full pitch, which is 6.

A motor stator comprises a stator core and the motor stator winding, wherein the motor stator winding is arranged on the stator core.

An electric motor comprises the motor stator.

By adopting the technical scheme, the stator winding is provided with the first coil group and the second coil group, the first coil group is arranged on the same radial layer of the stator core, the second coil group is arranged on two radially adjacent layers of the stator core, the first coil group is formed by winding a plurality of conductors and conductor groups with the same structure in a wave manner, the second coil group is formed by winding a plurality of conductor groups with the same structure in a wave manner, the stator winding can also comprise at least one third coil group, the third coil group is arranged between the first coil group and the second coil group, the third coil group is arranged on two radially adjacent layers of the stator core, the third coil group is formed by winding a plurality of conductor groups or conductor groups with the same structure in a wave manner, and the conductors, the conductor groups of the second coil group and the conductors or the conductor groups of the third coil group are similar in structure and are all U-shaped conductors, so that the manufacturing process is simplified, the production cost is reduced, and the processing efficiency is improved; the extending directions of the welding end parts of the third conductor group of the first coil group and the first conductor are opposite to the extending direction of the welding end part of the second conductor group of the second coil group, meanwhile, the extending directions of the welding end parts of the first conductor group of the second coil group extend in opposite directions, so that the extending directions of the welding end parts of different layers in the same groove of the stator core are opposite, the extending directions of the welding end parts of the same layer of the stator core are the same, the structure of the stator winding is a completely symmetrical structure on a magnetic circuit, the problem of loop current generated by an asymmetrical structure is solved, at least two loops of coils in each phase of the stator winding are connected in parallel along the circumferential direction of the stator core, torque fluctuation is reduced, noise is reduced, the manufacturing process is simplified, the production cost is reduced, and the processing efficiency is improved.

Drawings

Fig. 1 is a schematic structural view of a stator according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a stator winding according to a first embodiment of the present invention;

fig. 3 is a schematic structural diagram of a first coil assembly according to a first embodiment of the present invention;

fig. 4 is a schematic structural diagram of a coil assembly three according to a first embodiment of the present invention;

fig. 5 is a schematic structural diagram of a second coil assembly according to a first embodiment of the present invention;

fig. 6 is a schematic structural view of a first long-pitch conductor according to a first embodiment of the present invention;

fig. 7 is a schematic structural view of a first short-pitch conductor according to a first embodiment of the present invention;

fig. 8 is a schematic view of a first full-pitch conductor structure according to a first embodiment of the present invention;

fig. 9 is a schematic structural view of a second long-pitch conductor according to a first embodiment of the present invention;

fig. 10 is a schematic structural view of a second short-pitch conductor according to a first embodiment of the present invention;

fig. 11 is a schematic structural view of a third long-pitch conductor according to a first embodiment of the present invention;

fig. 12 is a schematic structural view of a third short-pitch conductor according to a first embodiment of the present invention;

fig. 13 is a schematic view of a winding manner of a stator winding according to a first embodiment of the present invention;

fig. 14 is a schematic diagram of a distributed connection structure of a phase winding according to a first embodiment of the present invention;

fig. 15 is a schematic structural view of a stator winding according to a second embodiment of the present invention;

fig. 16 is a schematic structural diagram of a coil assembly three according to a second embodiment of the present invention;

fig. 17 is a schematic structural view of a second full-pitch conductor according to a second embodiment of the present invention;

fig. 18 is a schematic view of a stator winding manner according to a second embodiment of the present invention;

fig. 19 is a schematic diagram of a distributed connection structure of a phase winding according to a second embodiment of the present invention;

fig. 20 is a schematic diagram of a parallel branch star connection configuration of some embodiments of the present invention;

fig. 21 is a schematic diagram of a parallel branch triangular connection structure according to some embodiments of the present invention.

In the figure:

10. stator winding 20, stator core 21, and slot

110. Coil group one 120, coil group three 130 and coil group two

210. A first conductor group 210A, a first long-pitch conductor 210B, a first short-pitch conductor

211. First full-pitch conductor 220, third conductor group 220A, second long-pitch conductor

220B, second short-pitch conductor 221, fourth conductor group 221A, and third long-pitch conductor

221B, a third short-pitch conductor 230, and a second full-pitch conductor

Detailed Description

The invention will be further described with reference to the accompanying drawings and specific embodiments.

Fig. 1-21 show the structure schematic diagram of two embodiments of the utility model, specifically show the structure of two embodiments, two embodiments all relate to a motor stator winding, motor stator and motor, and this stator winding's structure adopts complete symmetrical structure on the magnetic circuit, has eliminated because the circulation current problem that asymmetrical structure produced, and this stator winding adopts standard U-shaped conductor to arrange the preparation, has simplified manufacturing procedure, has reduced manufacturing cost, has improved machining efficiency.

1-5, a stator winding of an electric machine, as shown in fig. 1-5, includes a first coil group 110 and a second coil group 130, where the first coil group 110 and the second coil group 130 are both of an annular structure formed by rotating and overlapping a plurality of hairpin coils, the first coil group 110 and the second coil group 130 are sequentially arranged along a radial direction of a stator core 20, the first coil group 110 is arranged at a same layer in the radial direction of the stator core 20, and the first coil group 110 is arranged at an innermost layer or an outermost layer of the stator core 20, that is, the first coil group 110 may be arranged at a first layer on a radial inner side of the stator core 20, or the first coil group 110 is arranged at a first layer on a radial outer side of the stator core 20, and the second coil group 130 is arranged at two layers of the stator core 20, and is selected according to actual requirements; the first coil group 110 and the second coil group 130 may be sequentially disposed from inside to outside along the radial direction of the stator core 20, or the first coil group 110 and the second coil group 130 may also be sequentially disposed from outside to inside along the radial direction of the stator core 20, and may be disposed according to actual requirements.

The number of the first coil set 110 and the second coil set 130 may be one or more, and is set according to actual requirements, which is not specifically required here.

The first coil group 110 includes a plurality of first conductor groups 210 and a plurality of second conductor groups, the first conductor groups 210 and the second conductor groups are arranged along the circumferential direction of the stator core 20, and at least one phase of the first coil group 110 includes at least one first conductor group 210 and at least one second conductor group; the first coil group 110 is formed by rotating and winding a plurality of first conductor groups 210 and a plurality of second conductor groups, at least one first conductor group 210 and at least one second conductor group are included in multiple phases of the first coil group 110, the number of the first conductor groups 210 and the number of the second conductor groups in each phase can be one or more, and the arrangement is performed according to actual requirements.

The second coil group 130 includes a plurality of third conductor groups 220 and a plurality of fourth conductor groups 221, the third conductor groups 220 and the fourth conductor groups 221 are arranged along the circumferential direction of the stator core 20, the third conductor groups 220 and the fourth conductor groups 221 are alternately arranged in adjacent slots of the stator core 20 one by one, the second coil group 130 is formed by rotating and winding the plurality of third conductor groups 220 and the plurality of fourth conductor groups 221, and the third conductor groups 220 and the fourth conductor groups 221 are alternately arranged in adjacent slots of the stator core 20 one by one along the circumferential direction of the stator core 20, that is, the arrangement manner of the plurality of third conductor groups 220 and the plurality of fourth conductor groups 221 is as follows: a third conductor group 220, a fourth conductor group 221, a third conductor group 220, and a fourth conductor group 221 … … are sequentially and alternately arranged adjacent to each other, and are sequentially arranged along the circumferential direction of the stator core 20 to form a second coil group 130, and the number of the third conductor group 220 and the fourth conductor group 221 is selected according to actual requirements.

The conductors in the first conductor group 210, the conductors in the second conductor group, the conductors in the third conductor group 220 and the conductors in the fourth conductor group 221 are all hairpin coils with similar structures, each hairpin coil is a U-shaped conductor, each U-shaped conductor is provided with two welding end parts, each hairpin coil is used for being in welding connection with the welding end part of the hairpin coil of the adjacent layer, each hairpin coil is provided with two groove interiors and one wire plugging end part, one end of each groove interior is connected with the two welding end parts, the other end of each groove interior is connected with the wire plugging end part to form a U-shaped conductor structure, the U-shaped conductors with similar structures and different pitches are selected according to the preparation requirement of a stator winding to form the structures of the first conductor group 210, the second conductor group, the third conductor group 220 and the fourth conductor group 221, the first conductor groups 210 and the second conductor groups are formed into a coil group-110 arrangement structure according to a certain rule, the plurality of third conductor sets 220 and the plurality of fourth conductor sets 221 are configured into a structure of the second coil set 130 according to a certain arrangement rule, and the first coil set 110 and the second coil set 130 are configured into a stator winding structure, so that the stator winding is completely symmetrical in structure on a magnetic circuit.

Specifically, as shown in fig. 6 to 12, the first conductor group 210 includes a first long-pitch conductor 210A and a first short-pitch conductor 210B, the first long-pitch conductor 210A is provided around the outside of the first short-pitch conductor 210B, the pitch of the first long-pitch conductor 210A is a long pitch Z, preferably, the long pitch Z is 7, the pitch of the first short-pitch conductor 210B is a short pitch X, preferably, the short pitch X is 5; the second conductor set includes two adjacently disposed first full-pitch conductors 211, and the pitch of the first full-pitch conductors 211 is a full pitch Y, which is preferably 6.

The third conductor group 220 includes a second long-pitch conductor 220A and a second short-pitch conductor 220B, the second long-pitch conductor 220A is arranged around the outside of the second short-pitch conductor 220B, the pitch of the second long-pitch conductor 220A is a long pitch Z, preferably, the long pitch Z is 7, the pitch of the second short-pitch conductor 220B is a short pitch X, preferably, the short pitch X is 5; the fourth conductor group 221 includes a third long-pitch conductor 221A and a third short-pitch conductor 221B, the third long-pitch conductor 221A is provided around the outside of the third short-pitch conductor 221B, the pitch of the third long-pitch conductor 221A is a long pitch Z, preferably, the long pitch Z is 7, and the pitch of the third short-pitch conductor 221B is a short pitch X, preferably, the short pitch X is 5.

The first long-pitch conductor 210A, the first short-pitch conductor 210B, the first full-pitch conductor 211, the second long-pitch conductor 220A, the second short-pitch conductor 220B, the third long-pitch conductor 221A, and the third short-pitch conductor 221B are U-shaped conductors having similar structures, but the welding end of the first long-pitch conductor 210A, the welding end of the first short-pitch conductor 210B, and the welding end of the first full-pitch conductor 211 all extend in the same direction along the circumferential direction of the stator core 20, and the extending directions are the same; the welded ends of the third long-pitch conductor 221A and the welded ends of the third short-pitch conductor 221B both extend in the same direction along the circumferential direction of the stator core 20, and the extending directions are the same; the extending direction of the welding end of the first long-pitch conductor 210A is opposite to the extending direction of the welding end of the third long-pitch conductor 221A, one extending leftward and one extending rightward; in the present embodiment, the welding end of the first long-pitch conductor 210A, the welding end of the first short-pitch conductor 210B, and the welding end of the first full-pitch conductor 211 extend in the circumferential direction of the stator core 20, all extending in the same direction to the left, and the welding end of the third long-pitch conductor 221A and the welding end of the third short-pitch conductor 221B extend in the circumferential direction of the stator core 20, all extending in the same direction to the right.

The welding ends of the second long-pitch conductor 220A and the welding ends of the second short-pitch conductor 220B each extend in the circumferentially opposite directions of the stator core 20, extend in opposite directions, and are away from each other.

The welding ends connected with the inside of the two grooves of the first long-pitch conductor 210A, the first short-pitch conductor 210B, the first full-pitch conductor 211, the second long-pitch conductor 220A and the second short-pitch conductor 220B are all in the same layer, the welding end connected with the inside of one groove of the third long-pitch conductor 221A and the third short-pitch conductor 221B is in the same layer, and the welding end connected with the inside of the other groove is not in the same layer. Specifically, one welding end portion of the third long-pitch conductor 221A and the inside of the groove connected to the welding end portion are located in the same layer, and the other welding end portion of the third long-pitch conductor 221A and the inside of the groove connected to the welding end portion are not located in the same layer; one welding end portion of the third short-pitch conductor 221B and the inside of the groove connected to the welding end portion are located in the same layer, and the other welding end portion of the third short-pitch conductor 221B and the inside of the groove connected to the welding end portion are not located in the same layer, and are set according to actual requirements.

The motor stator winding 10 further includes at least one coil group three 120, the coil group three 120 is disposed between the coil group one 110 and the coil group two 130, the coil group three 120 is disposed on two radially adjacent layers of the stator core 20, the coil group three 120 includes a plurality of third conductor groups 220, the plurality of third conductor groups 220 are disposed along the circumferential direction of the stator core 20, and are rotationally overlapped to form a structure of the coil group three 120. The number of the coil sets 120 may be one or more, and is selected according to actual requirements.

Or, the motor stator winding 10 further includes at least one coil group three 120, the coil group three 120 is disposed between the coil group one 110 and the coil group two 130, the coil group three 120 is disposed on two radially adjacent layers of the stator core 20, the coil group three 120 includes a plurality of second full-pitch conductors 230, and the plurality of second full-pitch conductors 230 are disposed along the circumferential direction of the stator core 20 and are rotationally overlapped to form a structure of the coil group three 120. The second full-pitch conductor 230 has a pitch of a full pitch Y, which is preferably 6; the number of the coil group three 120 can be one or more, and is selected according to actual requirements; the welding ends of the second full-pitch conductors 230 extend in opposite directions along the circumferential direction of the stator core 20, and are away from each other. The second full-pitch conductor 230 is a U-shaped conductor, and both the inside of the two slots of the second full-pitch conductor 230 and the soldered end connected thereto are located at the same layer.

The number of radial layers of the stator core 20 is an odd number of layers equal to or greater than 3, and is selected according to actual requirements. When the number of radial layers of the stator core 20 is three, the stator core has a first coil group 110 and a second coil group 130, which are sequentially arranged from the inner layer to the outer layer along the radial direction of the stator core 20; when the number of radial layers of the stator core 20 is 5, the stator core is provided with a first coil group 110, a third coil group 120 and a second coil group 130, which are sequentially arranged from the inner layer to the outer layer along the radial direction of the stator core 20; when the number of radial layers of the stator core 20 is 7, the stator core is provided with a first coil group 110, two third coil groups 120 and a second coil group 130, and the first coil group, the second coil group and the third coil group are sequentially arranged from the inner layer to the outer layer along the radial direction of the stator core 20; by analogy, the number of layers of the stator core 20 increases, and the number of the coil groups three 120 increases.

The stator winding 10 has multiple phases, and at least two branches of each phase winding in the stator winding 10 along the circumferential direction of the stator core 20 are connected in parallel and are arranged according to actual requirements, which is not specifically required here. As shown in fig. 20 and 21, the outlet ends of the parallel branches in the multiple phases may be connected in a star connection or a delta connection, and are selected according to actual requirements.

The slot inner part of the stator winding 10, to which the outgoing line is correspondingly connected, is arranged on the first layer on the radial inner side or the first layer on the outer side of the stator core 20, and the slot inner part is arranged according to actual requirements, and no specific requirement is made here. The welding end portion connected to the outgoing line end may extend along the circumferential direction of the stator core 20, or may extend directly along the axial direction of the stator core 20, and is set according to actual requirements.

In the stator winding 10, the pitch between the two welded ends that are welded to each other is a full pitch, that is, the total length of the two welded ends that are welded to each other, which extends in the circumferential direction of the stator core 20, is a full pitch, preferably, the full pitch is 6, and the extension length of each of the two welded ends that are welded to each other, which extends in the circumferential direction of the stator core 20, is selected according to actual requirements.

A motor stator comprises a stator core 20 and the motor stator winding, wherein the motor stator winding is arranged on the stator core 20.

An electric motor comprises the motor stator.

In some embodiments described below, the stator winding 10 is a three-phase stator winding, the number of slots per phase per pole is 2, the rotor has 8 poles, and this is true 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, the coils in the stator winding 10 for each phase are connected in parallel along two branches in the circumferential direction of the stator core 20, that is, the windings of the U1 branch and the U2 branch in the U-phase winding are sequentially connected in parallel along the circumferential direction of the stator core 20, the windings of the V1 branch and the V2 branch in the V-phase winding are sequentially connected in parallel along the circumferential direction of the stator core 20, and the windings of the W1 branch and the W2 branch in the W-phase are sequentially connected in parallel along the circumferential direction of the stator core 20.

The stator core 20 is formed by laminating a plurality of annular magnetic steel plates, a plurality of insulating papers are inserted into the grooves of the magnetic steel plates, or other annular metal plates are laminated, and the stator core 20 is selected according to actual requirements and has two end faces in the axial direction; the stator core 20 has a plurality of slots 21 on a radially inner surface thereof, and the plurality of slots 21 are spaced apart at a predetermined slot pitch in a circumferential direction of the stator core 20, and both side walls of the slots 21 are teeth, that is, two adjacent slots 21 define one tooth, and the stator winding 10 is mounted on the stator core 20.

Example one

As shown in fig. 1 to 14, the stator winding 10 includes a first coil group 110, a plurality of third coil groups 120, and a second coil group 130, which are sequentially sleeved from inside to outside.

The first coil group 110 is located at the first layer of the radial inner side of the stator core 20, the third coil group 120 is located at the second layer and the third layer of the radial inner side of the stator core 20, and the second coil group 130 is located at the fourth layer and the fifth layer of the radial inner side of the stator core 20.

As shown in fig. 3, 6, 7 and 8, the first coil group 110 includes a plurality of first conductor groups 210 and a plurality of second conductor groups, in this embodiment, the number of the first conductor groups 210 is 6, and the number of the second conductor groups is 6. In each phase, there are two first conductor sets 210 and two second conductor sets, and the first conductor set 210, the second conductor set, the first conductor set 210, and the second conductor set are sequentially arranged along the circumferential direction of the stator core 20 and are distributed over 48 slots 21 of the first layer of the stator core 20.

The first conductor group 210 includes a first long-pitch conductor 210A and a first short-pitch conductor 210B, the first long-pitch conductor 210A is surrounded outside the first short-pitch conductor 210B, both inside of two slots of the first long-pitch conductor 210A and both inside of two slots of the first short-pitch conductor 210B are located in the first layer of the stator core 20, and both welded ends of the first long-pitch conductor 210A and both welded ends of the first short-pitch conductor 210B are located in the first layer of the stator core 20. The welded end of the first long-pitch conductor 210A and the welded end of the second short-pitch conductor 220B extend in the same direction in the circumferential direction of the stator core 20, and the extending direction is the same.

The second conductor group includes two first full-pitch conductors 211 adjacently disposed, two slot interiors of the first full-pitch conductors 211 are located at the first layer of the stator core 20, and two welding ends of the first full-pitch conductors 211 are located at the first layer of the stator core 20. The welded ends of the first full-pitch conductors 211 extend in the same direction along the circumferential direction of the stator core 20, and the extending direction is the same as the extending direction of the welded ends of the first long-pitch conductors 210A.

As shown in fig. 5 and 9-12, the second coil group 130 includes a plurality of third conductor groups 220 and a plurality of fourth conductor groups 221, in this embodiment, the number of the third conductor groups 220 is 12, the number of the fourth conductor groups 221 is 12, the third conductor groups 220 and the fourth conductor groups 221 are both disposed on the fourth layer and the fifth layer of the stator core 20, the third conductor groups 220 and the fourth conductor groups 221 are alternately disposed one by one along the circumferential direction of the stator core 20, and are fully distributed in 48 slots of the fourth layer and 48 slots of the fifth layer of the stator core 20.

The third conductor group 220 includes a second long-pitch conductor 220A and a second short-pitch conductor 220B, the second long-pitch conductor 220A is arranged around the second short-pitch conductor 220B, one slot of the second long-pitch conductor 220A is positioned in the fourth layer of the stator core 20, the welding end connected with the inside of the slot is positioned in the fourth layer, the other slot is positioned in the fifth layer of the stator core 20, the welding end connected with the inside of the slot is positioned in the fifth layer, and the two welding ends of the second long-pitch conductor 220A extend along the circumferential direction of the stator core 20 in the opposite direction and are far away from each other; one of the slot interiors of the second short-pitch conductors 220B is located at the fourth layer of the stator core 20, the welding end connected to the slot interior is located at the fourth layer, the other slot interior is located at the fifth layer of the stator core 20, the welding end connected to the slot interior is located at the fifth layer, and the two welding ends of the second short-pitch conductor 220B extend in the opposite directions along the circumferential direction of the stator core 20, are opposite in extending direction, and are far away from each other.

The fourth conductor group 221 includes a third long-pitch conductor 221A and a third short-pitch conductor 221B, the third long-pitch conductor 221A is disposed around the outside of the third short-pitch conductor 221B, one slot of the third long-pitch conductor 221A is located in the fourth layer of the stator core 20, a welding end connected to the inside of the slot is located in the fourth layer, the other slot is located in the fifth layer of the stator core 20, a welding end connected to the inside of the slot is located in the sixth virtual layer, and both welding ends of the third long-pitch conductor 221A extend in the same direction along the circumferential direction of the stator core 20; one slot inside of the third short-pitch conductor 221B is located at the fourth layer of the stator core 20, the welding end connected to the slot inside is located at the fourth layer, the other slot inside is located at the fifth layer of the stator core 20, the welding end connected to the slot inside is located at the sixth layer, both welding ends of the third short-pitch conductor 221B extend in the same direction along the circumferential direction of the stator core 20, and the extending direction of the welding end of the third long-pitch conductor 221A is the same as the extending direction of the welding end of the third short-pitch conductor 221B.

The extending direction of the welding end of the third long-pitch conductor 221A is opposite to the extending direction of the welding end of the first long-pitch conductor 210A.

As shown in fig. 4 and 9-10, the coil group three 120 includes a plurality of third conductor groups 220, in this embodiment, the number of the third conductor groups 220 is 24, and the third conductor groups 220 have the same structure as the third conductor groups 220 of the coil group two 130, except that the third conductor groups 220 of the coil group two 130 are located in the second layer and the third layer of the radial inner side of the stator core 20, and are fully distributed in 48 slots of the second layer and 48 slots of the third layer of the stator core 20, and other structures are the same and will not be described herein again.

In the present embodiment, the slot inner portion to which the lead wires are correspondingly connected is located at the first layer or the fifth layer in the radial direction of the stator core 20, and the extending directions of the welding ends at different layers in the same slot of the stator core 20 are opposite.

Example two

Compared with the first embodiment, the first coil group 110 and the second coil group 130 have the same structure, and are not described herein again, and the structure of the third coil group 120 is different, so the structure of the third coil group 120 is described.

As shown in fig. 15 to 19, coil group three 120 includes a plurality of second full-pitch conductors 230, in this embodiment, the number of the second full-pitch conductors 230 is 48, one inside of one slot of each second full-pitch conductor 230 is located in the second layer of stator core 20, the welding end connected to the inside of the slot is located in the second layer of stator core 20, the other inside of the slot is located in the third layer of stator core 20, the welding end connected to the inside of the slot is located in the third layer of stator core 20, the two welding ends of each second full-pitch conductor 230 extend in opposite directions along the circumferential direction of stator core 20, extend in opposite directions away from each other, and are fully distributed over 48 slots of the second layer and 48 slots of the third layer of stator core 20.

EXAMPLE III

Compared with the first embodiment and the second embodiment, the present embodiment has only one coil assembly one 110 and one coil assembly two 130, and does not have the coil assembly three 120, and the structures of the coil assembly one 110 and the coil assembly two 130 are the same as those of the coil assembly one 110 and the coil assembly two 130 of the first embodiment, and are not repeated herein.

By adopting the technical scheme, the stator winding is provided with the first coil group and the second coil group, the first coil group is arranged on the same radial layer of the stator core, the second coil group is arranged on two radially adjacent layers of the stator core, the first coil group is formed by winding a plurality of conductors and conductor groups with the same structure in a wave manner, the second coil group is formed by winding a plurality of conductor groups with the same structure in a wave manner, the stator winding can also comprise at least one third coil group, the third coil group is arranged between the first coil group and the second coil group, the third coil group is arranged on two radially adjacent layers of the stator core, the third coil group is formed by winding a plurality of conductor groups or conductor groups with the same structure in a wave manner, and the conductors, the conductor groups of the second coil group and the conductors or the conductor groups of the third coil group are similar in structure and are all U-shaped conductors, so that the manufacturing process is simplified, the production cost is reduced, and the processing efficiency is improved; the extending directions of the welding end parts of the third conductor group of the first coil group and the first conductor are opposite to the extending direction of the welding end part of the second conductor group of the second coil group, meanwhile, the extending directions of the welding end parts of the first conductor group of the second coil group extend in opposite directions, so that the extending directions of the welding end parts of different layers in the same groove of the stator core are opposite, the extending directions of the welding end parts of the same layer of the stator core are the same, the structure of the stator winding is a completely symmetrical structure on a magnetic circuit, the problem of loop current generated by an asymmetrical structure is solved, at least two loops of coils in each phase of the stator winding are connected in parallel along the circumferential direction of the stator core, torque fluctuation is reduced, noise is reduced, the manufacturing process is simplified, the production cost is reduced, and the processing efficiency is improved.

The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

Claims (10)

1. A stator winding for an electrical machine, comprising: the stator comprises a first coil group and a second coil group, wherein the first coil group and the second coil group are sequentially arranged along the radial direction of a stator core, the first coil group is arranged on the same radial layer of the stator core, the first coil group is arranged on the innermost layer or the outermost layer of the stator core, and the second coil group is arranged on two radially adjacent layers of the stator core; wherein the content of the first and second substances,

the first coil group comprises a plurality of first conductor groups and a plurality of second conductor groups, the first conductor groups and the second conductor groups are arranged along the circumferential direction of the stator core, and at least one phase of the first coil group comprises at least one first conductor group and at least one second conductor group;

the coil group comprises a plurality of third conductor groups and a plurality of fourth conductor groups, the third conductor groups and the fourth conductor groups are arranged along the circumferential direction of the stator core, and the third conductor groups and the fourth conductor groups are alternately arranged in adjacent slots of the stator core one by one.

2. The stator winding of an electric machine of claim 1, wherein: the first conductor group comprises a first long-pitch conductor and a first short-pitch conductor, the first long-pitch conductor is arranged around the outer part of the first short-pitch conductor, the pitch of the first long-pitch conductor is 7, and the pitch of the first short-pitch conductor is 5;

the second conductor set includes two adjacently disposed first full-pitch conductors having a pitch of 6.

3. The stator winding of an electric machine of claim 2, wherein: the third conductor group comprises a second long-pitch conductor and a second short-pitch conductor, the second long-pitch conductor is arranged around the outside of the second short-pitch conductor, the pitch of the second long-pitch conductor is 7, and the pitch of the second short-pitch conductor is 5; the welding end of the second long-pitch conductor and the welding end of the second short-pitch conductor both extend along the circumferential direction of the stator core, and the extending directions are opposite directions;

the fourth conductor group comprises a third long-pitch conductor and a third short-pitch conductor, the third long-pitch conductor is arranged around the outside of the third short-pitch conductor, the pitch of the third long-pitch conductor is 7, and the pitch of the third short-pitch conductor is 5;

and the welding end part of the third long-pitch conductor and the welding end part of the third short-pitch conductor extend along the circumferential direction of the stator core in the same direction, and the extending directions are the same.

4. A stator winding for an electrical machine according to claim 3, wherein: the welding end part of the first long-pitch conductor, the welding end part of the first short-pitch conductor and the welding end part of the first full-pitch conductor extend along the circumferential direction of the stator core in the same direction, and the extending directions of the welding end parts are the same; the extending direction of the welding end of the first long-pitch conductor is opposite to the extending direction of the welding end of the third long-pitch conductor.

5. The stator winding of an electrical machine according to claim 3 or 4, wherein: one welding end of the third long-pitch conductor and the inside of the groove connected with the welding end are positioned in the same layer, and the other welding end of the third long-pitch conductor and the inside of the groove connected with the welding end are not positioned in the same layer; one welding end portion of the third short-pitch conductor and the inside of the groove connected to the welding end portion are located in the same layer, and the other welding end portion of the third short-pitch conductor and the inside of the groove connected to the welding end portion are not located in the same layer.

6. A stator winding for an electrical machine according to any of claims 1-4, wherein: the stator winding further comprises at least one coil group III, the coil group III is arranged between the coil group I and the coil group II, the coil group III is arranged between two radial adjacent layers of the stator core, the coil group III comprises a plurality of third conductor groups, and the third conductor groups are arranged along the circumferential direction of the stator core.

7. A stator winding for an electrical machine according to any of claims 1-4, wherein: the stator winding further comprises at least one coil group III, the coil group III is arranged between the coil group I and the coil group II, the coil group III is arranged on two layers of the stator core which are adjacent in the radial direction, the coil group III comprises a plurality of second full-pitch conductors, the second full-pitch conductors are arranged along the circumferential direction of the stator core, the welding end parts of the second full-pitch conductors extend along the circumferential direction of the stator core, and the extending directions of the second full-pitch conductors and the second full-pitch conductors are opposite; the second full-pitch conductor has a pitch of 6.

8. A stator winding for an electrical machine according to any of claims 1-4, wherein: the number of radial layers of the stator core is an odd number of layers which is more than or equal to 3, and at least two branches in any phase winding of the stator winding are connected in parallel; in the stator winding, the pitch between the two welded ends which are welded is a full pitch, and the full pitch is 6.

9. A stator for an electrical machine, comprising: comprising a stator core and a stator winding of an electrical machine according to any one of claims 1-8, which stator winding is arranged on the stator core.

10. An electric machine characterized by: comprising an electric machine stator according to claim 9.

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