CN111181264A

CN111181264A - Motor stator and motor

Info

Publication number: CN111181264A
Application number: CN202010039763.2A
Authority: CN
Inventors: 柏荣键; 刘延海
Original assignee: Tianjin Santroll Electric Automobile Technology Co Ltd
Current assignee: Tianjin Songzheng Auto Parts Co ltd
Priority date: 2020-01-14
Filing date: 2020-01-14
Publication date: 2020-05-19

Abstract

The invention discloses a motor stator and a motor, 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 is installed on a stator iron core, the stator winding is three-phase and is provided with Q pole pair coils, the number of slots of each pole and each phase of Q/each pole is equal to P, P is an integer, the number of slots of each pole and each phase is more than or equal to 2, and the stator windings of the phases are respectively connected with the stator windings of the phases in series; the used coil units are few in types and simple in arrangement mode, the use of bus bars and bus bars can be reduced, the inconsistency of the twisting direction of the outer end part of the groove and the distance between the twisting grooves can be eliminated, the branch and the neutral point of each phase of winding are arranged on any layer of any groove, the complexity degree of the manufacturing process is further reduced, the production cost is reduced, and the processing efficiency is improved.

Description

Motor stator and motor

Technical Field

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

Background

The stator winding comprises a plurality of hairpin coils, and the hairpin coils penetrate into the slots of the stator core according to a certain arrangement mode to form the winding of the required single-phase motor or multi-phase motor. The hairpin coils used in the prior art are various and complex in arrangement mode, and a large number of bus bars and bus bars are needed to be used for connecting branches and neutral points of windings of each phase;

in the prior art, more than 90% of stator windings are provided with the number of slots of each pole and each phase being more than or equal to 2, but if the stator windings are connected in series among phases, the twisting direction of the outer end part of a coil slot or the distance between the twisting slots are inconsistent, the manufacturing process is complex, the forming is difficult, the production cost is high, and the processing efficiency is low.

Disclosure of Invention

The motor stator and the motor provided by the embodiment of the invention have the advantages that the types of the used coil units are few, the arrangement mode is simple, the use of bus bars and bus bars can be reduced, the inconsistency of the twisting direction of the outer end part of the slot and the distance between twisted slots can be eliminated, the branch and the neutral point of each phase of winding are arranged on any layer of any slot, the complexity of the manufacturing process is further reduced, the production cost is reduced, and the processing efficiency is improved.

An embodiment of the present invention provides a motor stator, including:

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 mounted on the stator core,

the stator winding is three-phase and is provided with Q pole pair coils, the number of slots of each phase of each pole/Q pole is equal to P, wherein P is an integer, the number of slots of each phase of each pole is more than or equal to 2, and the stator windings of the phases are respectively connected with the stator windings of the phases in series;

the stator winding includes: the first coil group and the third coil group are sleeved from inside to outside in sequence;

the first coil set has a plurality of U-shaped conductors, the U-shaped conductors including:

the two outer slot ends are positioned on the same radial layer of the stator core, and the outer slot ends of the U-shaped conductors of the first coil group have the same extension direction in the circumferential direction of the stator core and the same span in the circumferential direction;

the two slot interiors are positioned in two slots which are in the same layer in the radial direction of the stator core and are separated by a specified slot distance; the inner parts of the plurality of slots of the plurality of U-shaped conductors of the first coil group are sequentially positioned on the same layer of the stator core in the radial direction along the circumferential direction of the stator core;

the third coil set has a plurality of U-shaped conductors, the U-shaped conductors comprising:

the two outer slot ends are positioned on the same radial layer of the stator core, and the outer slot ends of the U-shaped conductors of the third coil group have the same extension direction in the circumferential direction and the same span in the circumferential direction;

the two slot interiors are positioned in two slots which are in the same layer in the radial direction of the stator core and are separated by a specified slot distance; the inner parts of a plurality of grooves of the plurality of U-shaped conductors of the third coil group are sequentially positioned on the same radial layer of the stator core along the circumferential direction;

further, the plurality of U-shaped conductors of the first coil group further includes: an out-of-slot turn located at an outer end of a stator core slot connecting two slots of the plurality of U-shaped conductors of the first coil assembly;

the plurality of U-shaped conductors of the third coil set further comprises: an out-of-slot turn located at an outer end of a stator core slot connecting two slots of the plurality of U-shaped conductors of the third coil assembly;

the plurality of U-shaped conductors of the first coil group have an outside slot turn having a different slot pitch than the plurality of U-shaped conductors of the third coil group.

Further, a second coil assembly disposed between the first coil assembly and the third coil assembly is also included, the second coil assembly including a plurality of U-shaped conductors, the U-shaped conductors including:

the outer ends of the two slots are positioned on two layers of stator iron cores which are adjacent in the radial direction, the outer ends of the slots of the plurality of U-shaped conductors positioned on the same layer of the stator iron cores in the radial direction have the same extension direction in the circumferential direction of the stator iron cores, and the spans in the circumferential direction are the same;

the two slot interiors are positioned in two slots which are formed in two adjacent layers of the stator core in the radial direction and are separated by a specified slot distance; the inner parts of the multiple grooves of the multiple U-shaped conductors of the second coil group are sequentially positioned at two layers of inner radial direction adjacent to the stator core groove along the circumferential direction of the stator core;

further, the plurality of U-shaped conductors of the first coil group include: a plurality of first U-shaped conductors having a long pitch of a groove pitch of an outside-groove turn portion;

a plurality of second U-shaped conductors having a short pitch of a groove pitch of the out-of-groove turns.

Further, the groove pitch of the out-of-groove bent portions of the first U-shaped conductors is 7, and the groove pitch of the out-of-groove bent portions of the second U-shaped conductors is 5.

Further, the groove pitch of the out-of-groove bent portions of the first U-shaped conductors is 10, and the groove pitch of the out-of-groove bent portions of the second U-shaped conductors is 7.

Further, the groove pitch of the out-of-groove bent portions of the first U-shaped conductors is 11, and the groove pitch of the out-of-groove bent portions of the second U-shaped conductors is 8.

Further, the groove pitch of the out-of-groove turns of the plurality of U-shaped conductors of the third coil group is a full pitch.

Further, the groove pitch of the out-of-groove turns of the plurality of U-shaped conductors is 6.

Further, the groove pitch of the out-of-groove turns of the plurality of U-shaped conductors is 9.

Further, the slot pitches of the out-of-slot turns of the plurality of U-shaped conductors of the second coil group are the same as the slot pitches of the out-of-slot turns of the plurality of U-shaped conductors of the first coil group.

Further, the slot pitches of the out-of-slot turns of the plurality of U-shaped conductors of the second coil group are the same as the slot pitches of the out-of-slot turns of the plurality of U-shaped conductors of the third coil group.

Further, the turn of each U-shaped conductor of each coil group of the stator winding is located on one side of the outer end of the stator core slot, and the plurality of out-of-slot ends of each U-shaped conductor of each coil group of the stator winding are located on the other side of the outer end of the stator core slot.

Further, the extending directions of the outer end parts of two slots of the stator winding, which are positioned at the radial direction adjacent to the stator core, in the circumferential direction are opposite.

Further, the turning directions of the two out-of-slot turning parts of the two U-shaped conductors of the same-phase adjacent slots in the third coil group are opposite.

Further, the turning directions of the two out-of-slot turning parts of the two U-shaped conductors of the same-phase adjacent slots in the first coil group are the same.

Furthermore, the outer end part of the first slot and the outer end part of the second slot are provided with extension ends, except the extension end connected with the outgoing line, N-1 layers of the extension ends which are positioned in the same radial direction of the stator core and adjacent to each other are connected with N layers of the extension ends, wherein N is an even number.

An embodiment of the present invention further provides a motor, including: rotor and motor stator of any preceding embodiment.

The motor stator in the technical scheme of the embodiment of the invention 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; the stator winding is arranged on a stator iron core, the stator winding is three-phase and is provided with Q pole pair coils, the number of slots of each phase of each pole of Q/each pole is equal to P, P is an integer, the number of slots of each phase of each pole is more than or equal to 2, and each phase of stator winding is respectively connected with each phase-to-phase stator winding in series; the stator winding includes: the first coil group and the third coil group are sleeved from inside to outside in sequence; the first coil set has a plurality of U-shaped conductors, the U-shaped conductors including: the two outer slot ends are positioned on the same radial layer of the stator core, and the outer slot ends of the U-shaped conductors of the first coil group have the same extension direction in the circumferential direction of the stator core and the same span in the circumferential direction; the two slot interiors are positioned in two slots which are in the same layer in the radial direction of the stator core and are separated by a specified slot distance; the inner parts of the plurality of slots of the plurality of U-shaped conductors of the first coil group are sequentially positioned on the same layer of the stator core in the radial direction along the circumferential direction of the stator core; the third coil set has a plurality of U-shaped conductors, the U-shaped conductors comprising: the two outer slot ends are positioned on the same radial layer of the stator core, and the outer slot ends of the U-shaped conductors of the third coil group have the same extension direction in the circumferential direction and the same span in the circumferential direction; the two slot interiors are positioned in two slots which are in the same layer in the radial direction of the stator core and are separated by a specified slot distance; the inner parts of a plurality of grooves of the plurality of U-shaped conductors of the third coil group are sequentially positioned on the same radial layer of the stator core along the circumferential direction; the used coil units are few in types and simple in arrangement mode, the use of bus bars and bus bars can be reduced, the inconsistency of the twisting direction of the outer end part of the groove and the distance between the twisting grooves can be eliminated, the branch and the neutral point of each phase of winding are arranged on any layer of any groove, the complexity degree of the manufacturing process is further reduced, the production cost is reduced, and the processing efficiency is improved.

Drawings

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

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

fig. 3 is a structural diagram of a first coil assembly 110 according to an embodiment of the present invention;

fig. 4 is a structural diagram of a U-shaped conductor 210 according to an embodiment of the present invention;

fig. 5 is a structural diagram of a third coil assembly 130 according to an embodiment of the present invention;

fig. 6 is a structural diagram of a U-shaped conductor 230 according to an embodiment of the present invention;

fig. 7 is a structural diagram of a second coil assembly 120 according to an embodiment of the present invention;

fig. 8 is a structural diagram of a U-shaped conductor 220A according to an embodiment of the present invention;

fig. 9 is a structural diagram of another second coil assembly 120 according to an embodiment of the present invention;

fig. 10 is a structural diagram of another U-shaped conductor 220B according to an embodiment of the present invention;

fig. 11 is a structural diagram of U-shaped conductors in two adjacent slots in phase according to an embodiment of the present invention;

fig. 12 is a structural diagram of a phase of a third coil assembly 130 according to an embodiment of the present invention;

fig. 13 is a first phase structure diagram of a first coil assembly 110 according to an embodiment of the present invention;

fig. 14 is a structural view of a stator of a motor according to a second embodiment of the present invention;

fig. 15 is a schematic view of a tiled development of a phase stator winding of an electric machine stator winding according to an embodiment of the present invention;

fig. 16 is a structural view of a stator of a motor according to a third embodiment of the present invention;

fig. 17 is a structural diagram of a stator winding of a motor according to a third embodiment of the present invention;

fig. 18 is a structural diagram of a first coil assembly 110 according to a third embodiment of the present invention;

fig. 19 is a structural diagram of a U-shaped conductor 210 according to a third embodiment of the present invention;

fig. 20 is a structural diagram of a third coil assembly 130 according to a third embodiment of the present invention;

fig. 21 is a structural diagram of a U-shaped conductor 230 according to a third embodiment of the present invention;

fig. 22 is a structural diagram of a second coil assembly 120 according to a third embodiment of the present invention;

fig. 23 is a structural diagram of a U-shaped conductor 220B according to a third embodiment of the present invention;

fig. 24 is a structural view of another U-shaped conductor 210A according to a third embodiment of the present invention;

fig. 25 is a structural diagram of U-shaped conductors in three adjacent slots according to a third embodiment of the present invention;

fig. 26 is a structural diagram of a phase of a third coil assembly 130 according to a third embodiment of the present invention;

fig. 27 is a structural diagram of a phase of the first coil assembly 110 according to a third embodiment of the present invention;

fig. 28 is a schematic view of a tiled development of a phase stator winding of a stator winding of an electric machine according to a third 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 not restrictive thereof, and that only some, but not all, of the structures described herein are shown in the drawings for purposes of illustration and description.

The invention provides a motor stator. In fig. 1, 3, 7, 9, 16, 18, 20, 22, the extending direction of A1a2 is parallel to the axial direction of the stator core, the extending direction of B1B2 is the circumferential direction of the stator core, and O1O2, O1O3 and O1O4 are three directions drawn by way of example and extending in the radial direction of the stator core.

As shown in fig. 1, an embodiment of the present invention provides a stator of an electric motor, including: a stator core 20, 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 and spaced apart at predetermined slot pitches in a circumferential direction of the stator core;

as shown in fig. 1 to 2, a stator winding 10, which is mounted on a stator core 20, wherein the stator winding 10 is three-phase, and has Q number of pole pair coils, and Q/number of slots per pole per phase is equal to P, where P is an integer, and the number of slots per pole per phase is greater than or equal to 2, and each phase stator winding is respectively connected in series with each phase-to-phase stator winding;

with reference to fig. 1-2, in the present embodiment, the stator winding 10 is a stator winding 10, and the stator winding 10 is mounted on a stator core 20, wherein the stator winding 10 is three-phase (i.e., U-phase, V-phase, W-phase), and the number of slots per pole per phase is greater than or equal to 2;

in the present embodiment, two slots 21 are provided for each magnetic pole of the rotor. The rotor has eight poles and this is true for each phase of the three-phase stator winding 10, the rotor having one pole for each of the Q pole pair coils of the stator winding, Q being 4 in this embodiment, 4/2 being 2, and accordingly the number of slots 21 provided in the stator core 20 is equal to 48 (i.e., 2X8X 3).

Further, in the present embodiment, the stator core 20 is formed with two end faces 25, 26 in the axial direction of the stator core by laminating a plurality of annular magnetic steel plates in which a plurality of insulating papers are inserted (not shown in the present figure) to define one tooth 22 by two adjacent slots 21 of the stator core 20, and it should be noted that other conventional metal plates may be used instead of the magnetic steel plates.

Illustratively, as shown in fig. 1-2, the stator winding includes: the first coil group 110 and the third coil group 130 are sleeved from inside to outside in sequence;

with reference to fig. 1-2, in the present embodiment, the first coil group 110 is disposed at a radially inner layer of the stator core, i.e., close to the direction of the radially inner surface of the stator core, in the present embodiment, the first coil group 110 is located at a radially first layer of the stator core, the third coil group 130 is disposed at a radially outer layer of the stator core, i.e., far from the direction of the radially inner surface of the stator core, and in the present embodiment, the third coil group 130 is located at a radially 4 th layer of the stator core; correspondingly, each coil group in the stator winding 10 may also be sequentially sleeved from outside to inside with the first coil group 110 disposed on the radial outer layer of the stator core, i.e., away from the radial inner surface direction of the stator core, and the third coil group 130 disposed on the radial inner layer of the stator core, i.e., close to the radial inner surface direction of the stator core.

As shown in fig. 3 to 4, the first coil group 110 has a plurality of U-shaped conductors 210(2101, 2102), and the U-shaped conductors 210(2101, 2102) include: two outer slot ends 21031, the two outer slot ends 21031 are located in the same radial layer of the stator core 20, and the plurality of outer slot ends 21031 of the plurality of U-shaped conductors 210(2101, 2102) have the same extension direction in the circumferential direction of the stator core and the same span in the circumferential direction;

two slot inner portions 21011, the two slot inner portions 21011 are positioned in two slots 21 of the same radial layer of the stator core 20 at a predetermined slot pitch; the plurality of slot interiors 21011 of the plurality of U-shaped conductors 210(2101, 2102) of the first coil group 110 are sequentially located at the same radial layer of the stator core 20 along the circumferential direction of the stator core;

with reference to fig. 3 and 4, in the present embodiment, the first coil group 110 includes 24U-shaped conductors 210 (in the present embodiment, the 24U-shaped conductors 210 include 12U-shaped conductors 2101 and 12U-shaped conductors 2102), and the U-shaped conductors 210(2101 and 2102) include: the stator core comprises a slot outer end 21031, a slot inner 21011, a slot outer turning part 21021, a slot inner 21011, a slot outer end 21031, which are connected in sequence, wherein the two slot outer ends are respectively connected with the two slot inner parts 21011 positioned on the outer end 26 side of the stator core slot correspondingly in the same layer, in the embodiment, the two slot outer ends 21031 of the U-shaped conductors 210(2101 and 2102) have the same extension direction in the circumferential direction of the stator core, both extend clockwise (rightward) and have the same span extending in the circumferential direction of the stator core, and in the embodiment, the span extending in the circumferential direction of the stator core is 3 slot pitches, namely 3d slot pitches.

The two slot inner portions 21011 of the U-shaped conductors 210(2101, 2102) are located in two slots separated by a prescribed slot pitch, the two slot inner portions 21011 are located in the same radial layer of the stator core slot 21, i.e., close to the direction of the radially inner surface of the stator core, in the first layer of the stator core slot 21, and correspondingly, the slot outer end portion 21031 is also located in the same radial layer of the stator core, i.e., in the first layer of the stator core 20, the first coil group is located in the radial 1 st layer of the stator core in this embodiment, and accordingly, both the slot inner portions 21011 and the slot outer end portions 21031 in the first coil group are located in the radial 1 st layer of the stator core.

As shown in fig. 5 and 6, the third coil group 130 has a plurality of U-shaped conductors 230(2301), and the U-shaped conductors 230(2301) include: the two outer slot ends 21031 are positioned on the same radial layer of the stator core 20, the outer slot ends 21031 of the plurality of U-shaped conductors 230 have the same extension direction in the circumferential direction of the stator core and have the same span in the circumferential direction; two slot interiors 21011, the two slot interiors 21011 being located in two slots 21 of the same radial layer of the stator core 20 and spaced apart by a prescribed slot pitch; the plurality of slot interiors 21011 of the plurality of U-shaped conductors 230(2301) of the third coil group 230(2301) are located at the same radial layer of the stator core 20 in the circumferential direction of the stator core;

with reference to fig. 5 and 6, in the present embodiment, the third coil group 130 includes 24U-shaped conductors 230(2301), and the U-shaped conductors 230(2301) include: the two outer slot ends 21031 of the U-shaped conductor 230(2301) in the present embodiment extend in the circumferential direction of the stator core in the same direction, and both extend counterclockwise (leftward) and have the same span extending in the circumferential direction, and in the present embodiment, the span extending in the circumferential direction of the stator core is 3 slot pitches, that is, 3d slot pitches.

The two slot inner parts 21011 of the U-shaped conductor 230(2301) are located in two slots separated by a specified slot distance, the two slot inner parts 21011 are located in the same radial layer of the stator core slot 21, namely, in the direction close to the radial inner surface of the stator core, in the nth layer of the stator core slot 21, correspondingly, the slot outer end part 21031 is also located in the same radial layer of the stator core, namely, in the nth layer of the stator core slot, in this embodiment, the third coil group is located in the fourth radial layer of the stator core, and correspondingly, the slot inner parts 21011 and the slot outer end parts 21031 in the third coil group are both located in the fourth radial layer of the stator core; the coil units used are few in types and simple in arrangement mode, the use of bus bars and bus bars can be reduced, the inconsistency of the twisting direction of the outer end part of the groove and the distance between the twisting grooves can be eliminated, the branch and the neutral point of each phase winding are arranged on any layer of any groove, the complexity of the manufacturing process is further reduced, the production cost is reduced, and the processing efficiency is improved.

Illustratively, as shown in fig. 2-6, the plurality of U-shaped conductors 210(2101, 2102) of the first coil assembly 110 further comprises: an outer-slot turn 21021, the outer-slot turn 21021 being located on the outer-slot end 25 side of the stator core 20 and connecting the two slot interiors 21011 of the plurality of U-shaped conductors 210(2101, 2102) of the first coil group 110; the plurality of U-shaped conductors 230(2301) of third coil set 130 further include: an outer-slot turn 21021, the outer-slot turn 21021 being located on the outer slot end 25 side of the stator core 20, and connecting the two slot inner portions 21011 of the plurality of U-shaped conductors 230(2301) of the third coil group 130; the slot pitch of the out-of-slot turns 21021 of the plurality of U-shaped conductors 210(2101, 2102) of the first coil group 110 is different from the out-of-slot turns 21021 of the plurality of U-shaped conductors 230(2301) of the third coil group 130.

With reference to fig. 2 to 6, in the present embodiment, the 24U-shaped conductors 210(2101, 2102) of the first coil group 110 further include: an outer-slot turn 21021, the outer-slot turn 21021 being located on the outer-slot end 25 side of the stator core 20 and connecting to the corresponding two inner-slot portions 21011, further, the slot pitch between the two inner-slot portions 21011 of the 12U-shaped conductors 2101 of the 24U-shaped conductors 210 being X (X in this embodiment being 7), correspondingly, the slot pitch of the outer-slot turn 21021 connecting between the two inner-slot portions 21011 of the U-shaped conductors 2101 being X (X in this embodiment being 7), the slot pitch between the two inner-slot portions of the 12U-shaped conductors 2102 of the 24U-shaped conductors 210 being Y (Y in this embodiment being 5), and correspondingly, the slot pitch between the two inner-slot portions 21011 connecting to the U-shaped conductors 2102 being Y (Y in this embodiment being 5); the 24U-shaped conductors 230(2301) of third coil set 130 further include: an outer-slot turn 21021, the outer-slot turn 21021 being located on the outer-slot end 25 side of the stator core 20 and connecting the corresponding two inner-slot portions 21011, further, the slot pitch between the two inner-slot portions 21011 of the 24U-shaped conductors 230(2301) being Z (in this embodiment, Z is 6), and correspondingly, the slot pitch of the outer-slot turn 21021 connecting the two inner-slot portions 21011 of the U-shaped conductors 230(2301) being Z (in this embodiment, Z is 6); that is, the slot pitch of the out-of-slot turns 21021 of the 24U-shaped conductors 210(2101, 2102) of the first coil group 110 is different from the slot pitch of the out-of-slot turns 21021 of the 24U-shaped conductors 230 of the third coil group 130.

Illustratively, as shown in fig. 2, 7, 8, 9, and 10, the present invention further includes a second coil group 120 disposed between the first coil group 110 and the third coil group 130, the second coil group 120 includes a plurality of U-shaped conductors 220A (or 220B), and the U-shaped conductors 220A (220B) include: the two outer slot ends 21031 are positioned at two adjacent layers in the radial direction of the stator core 20, the outer slot ends 21031 of the plurality of U-shaped conductors 220A (220B) positioned at the same layer in the radial direction of the stator core 20 have the same extension direction in the circumferential direction of the stator core, and the spans in the circumferential direction are the same; the two slot interiors 21011, the two slot interiors 21011 are located in two slots 21 which are radially adjacent two layers and are separated by a specified slot distance in the stator core slot 21; the multi-slot inner parts 21011 of the plurality of U-shaped conductors 220A (or 220B) of the second coil group 120 are sequentially positioned at two radially adjacent layers in the stator core slot 21 along the circumferential direction of the stator core;

optionally, on the basis of the foregoing embodiment, as shown in fig. 2, fig. 7, fig. 8, fig. 9, and fig. 10, the stator winding 10 further includes a second coil group 120 disposed between the first coil group 110 and the third coil group 130, and with reference to fig. 7 and fig. 8, in this embodiment, the second coil group 120 includes 48U-shaped conductors 220A (220B), and the U-shaped conductors 220A (220B) include: the stator core comprises a slot outer end 21031, a slot inner 21011, a slot outer turning part 21021, a slot inner 21011, a slot outer end 21031, two slot outer ends are respectively connected with the two slot inner parts 21011 positioned on the outer end 26 side of the stator core slot correspondingly in the same layer, the extending directions of the two slot outer ends 21031 of the U-shaped conductors 220A (2201, 2202) or 220B (2201) in the circumferential direction of the stator core are opposite, the slot outer ends 21031 positioned on the same layer in the radial direction of the stator core extend along the counterclockwise direction (the right direction) and have the same span extending in the circumferential direction, and the span extending in the circumferential direction of the stator core in the embodiment is 3 slot pitches, namely 3d slot pitches; the outer end 21031 of the other slot positioned on the same radial layer of the stator core extends clockwise (leftwards) and has the same span extending in the circumferential direction; the span extending in the circumferential direction of the stator core in the present embodiment is 3 slot pitches, i.e., 3d slot pitches.

The two slot inner portions 21011 of the U-shaped conductor 220A (220B) are located in two slots 21 separated by a specified slot pitch, the two slot inner portions 21011 are located in two radially adjacent layers of the stator core slot 21, i.e., on a side close to the radially inner surface of the stator core, on the N-1 st layer N-2 nd layer in the radial direction of the stator core 20, and correspondingly, the slot outer end portion 21031 is also located in two radially adjacent layers of the stator core 20, i.e., on the N-1 st layer N-2 nd layer, in this embodiment, the second coil group is located in the third layer second layer in the radial direction of the stator core, and correspondingly, the slot inner portion 21011 and the slot outer end portion 21031 in the second coil group are both located in the third layer second layer in the radial direction of.

The plurality of U-shaped conductors of the first coil set include: a plurality of first U-shaped conductors having a long pitch of a groove pitch of an outside-groove turn portion; a plurality of second U-shaped conductors having a short pitch of a groove pitch of an outside-groove turn portion; the first U-shaped conductors have an outer-slot turn having a slot pitch of 7, and the second U-shaped conductors have an outer-slot turn having a slot pitch of 5.

Illustratively, as shown in fig. 3 and 4, the plurality of U-shaped conductors 210 of the first coil group 110 include: a plurality of first U-shaped conductors 2101 each having an outside-groove turn 21021 with a groove pitch X (in this example, X is 7); a plurality of second U-shaped conductors 2102 each having an outside-groove turn 21021 with a groove pitch Y (5 in this embodiment), in this embodiment, a U-shaped conductor having a groove pitch of 6 between two inside grooves of the U-shaped conductor has a full pitch, a U-shaped conductor having a groove pitch of more than 6 has a long pitch, and a U-shaped conductor having a groove pitch of less than 6 has a short pitch, and thus, in this embodiment, the groove pitch of the outside-groove turn of the first U-shaped conductors 2101 is a long pitch, and the groove pitch of the outside-groove turn of the second U-shaped conductors 2102 is a short pitch.

With reference to fig. 3 and 4, the first coil group 110 includes: 24U-shaped conductors 210(2101, 2102)

Further, the 24U-shaped conductors 210 include 12 first U-shaped conductors 2101, a slot pitch between two slot inner portions 21011 of the 12 first U-shaped conductors 2101 is X (X is 7 in the present embodiment), and accordingly, a slot pitch of an outer-slot turn 21021 connecting between the two slot inner portions 21011 of the first U-shaped conductors 2101 is X (X is 7 in the present embodiment); the 24U-shaped conductors 210 further include 12 second U-shaped conductors 2102, and the slot pitch between the two slot interiors of the 12 second U-shaped conductors 2102 is Y (Y is 5 in this embodiment), and accordingly, the slot pitch between the two slot interiors 21011 connecting the second U-shaped conductors 2102 is Y (Y is 5 in this embodiment); the groove pitch of the out-of-groove turning portions 21021 of the second U-shaped conductors is Y (Y is 5 in this embodiment), and in this embodiment, the U-shaped conductor having a groove pitch of 6 between the two groove interiors of the U-shaped conductor is a full pitch, the groove pitch of the U-shaped conductor is greater than 6 which is a long pitch, and the groove pitch of the U-shaped conductor is less than 6 which is a short pitch, and thus it can be seen that the groove pitch in the groove interiors of the first U-shaped conductors 2101 is a long pitch, and the groove pitch in the groove interiors of the second U-shaped conductors 2102 is a short pitch in this embodiment.

Alternatively, as shown in fig. 5 and 6, the slot pitch of the out-of-slot bends 21021 of the U-shaped conductors 230(2301) of the third coil group 130 is Z (Z is 6 in this embodiment), and the slot pitch of the out-of-slot bends of the U-shaped conductors of the third coil group is a full pitch.

Optionally, on the basis of the above embodiment, as shown in fig. 5 and 6, in this embodiment, the third coil group 130 includes: 24U-shaped conductors 230(2301)

Further, the 24U-shaped conductors 230 include 24U-shaped conductors 2301, and the slot pitch between the two slot inner portions 21011 of the 24U-shaped conductors 2301 is Z (Z is 6 in the present embodiment), and accordingly, the slot pitch of the out-of-slot turn 21021 connecting the two slot inner portions 21011 of the U-shaped conductors 2301 is Z (Z is 6 in the present embodiment); in the present embodiment, the U-shaped conductor having a slot pitch of 6 between the two slot interiors of the U-shaped conductor is a full pitch, and thus it can be seen that the slot pitch of the out-of-slot turns of the plurality of U-shaped conductors 2301 is a full pitch in the present embodiment.

Alternatively, as shown in fig. 4 and 8, the slot pitches of the out-of-slot bent portions 21021 of the U-shaped conductors 220A (2201, 2202) of the second coil group 120 are the same as the slot pitches of the out-of-slot bent portions of the U-shaped conductors 210(2101, 2102) of the first coil group 110.

Alternatively, on the basis of the above-described embodiments, with reference to fig. 4 and 8, the slot pitch between the two inside-slot 21011 portions of the 12U-shaped conductors 2101 in the 24U-shaped conductors 210(2101 and 2102) of the first coil assembly 110 is X (X is 7 in the present embodiment), and accordingly, the slot pitch of the outside-slot turn 21021 connecting the two inside-slot 21011 portions of the U-shaped conductors 2101 is X (X is 7 in the present embodiment), the slot pitch between the two inside-slot portions of the 12U-shaped conductors 2102 in the 24U-shaped conductors 210 is Y (Y is 5 in the present embodiment), and accordingly, the slot pitch between the two inside-slot 21011 portions connecting the U-shaped conductors 2102 is Y (Y is 5 in the present embodiment); a slot pitch between two slot inner portions 21011 of 24U-shaped conductors 2201 out of 48U-shaped conductors 220A (2201, 2202) of the second coil group 120 is X (X is 7 in this embodiment), accordingly, a slot pitch of an outside-slot turn 21021 connecting the two slot inner portions 21011 of the U-shaped conductors 2201 is X (X is 7 in this embodiment), a slot pitch between two slot inner portions of 24U-shaped conductors 2102 out of the 48U-shaped conductors 220A is Y (Y is 5 in this embodiment), accordingly, a slot pitch between the two slot inner portions 21011 connecting the U-shaped conductors 2102 is Y (Y is 5 in this embodiment); as can be seen, in the present embodiment, the out-of-slot bends 21021 of the 48U-shaped conductors 220A (2201, 2202) of the second coil 120 have the same slot pitch as the out-of-slot bends of the 24U-shaped conductors 210(2201, 2202) of the first coil group 110.

Alternatively, as shown in fig. 6 and 10, the slot pitches of the out-slot bent portions 21021 of the U-shaped conductors 220B (2201) of the second coil group 120 and the out-slot bent portions 21021 of the U-shaped conductors 230(2301) of the third coil group 130 are the same.

Alternatively, on the basis of the above-described embodiment, with reference to fig. 6 and 10, the slot pitch between the two slot inner portions 21011 of the 24U-shaped conductors 230(2301) of the third coil group 130 is Z (Z is 6 in this embodiment), and correspondingly, the slot pitch of the out-slot turn 21021 connecting the two slot inner portions 21011 of the U-shaped conductors 2301 is Z (Z is 6 in this embodiment); the slot pitch between the two slot inner portions 21011 of the 48U-shaped conductors 220B (2201) of the second coil group 120 is Z (Z is 6 in the present embodiment), and accordingly, the slot pitch of the outside-slot turn 21021 connecting the two slot inner portions 21011 of the U-shaped conductor 2201 is Z (Z is 6 in the present embodiment); as can be seen, in the present embodiment, the out-of-slot bends 21021 of the 48U-shaped conductors 220B (2201) of the second coil 120 have the same slot pitch as the out-of-slot bends of the 24U-shaped conductors 230(2301) of the third coil group 130.

Illustratively, as shown in fig. 1-10, the turn 21021 of each U-shaped conductor of each coil group of the stator winding 10 is located on one side of the stator core 20 slot outer end 25, and the plurality of slot outer ends 21031 of each U-shaped conductor of each coil group of the stator winding 10 are located on the other side of the stator core 20 slot outer end 26.

Alternatively, on the basis of the above-mentioned embodiment, with reference to fig. 1 to 11, in this embodiment, the bent portion 21021 of each U-shaped conductor in the first coil group 110 in the stator winding 10 is located on one side of the outer end 25 of the slot of the stator core 20, and the bent portion 21021 of each U-shaped conductor in the third coil group 130 in the stator winding is located on one side of the outer end 25 of the slot of the stator core 20; each of the U-shaped conductor outer ends 21031 of the first coil group 110 in the stator winding 10 is located at the other side of the stator core 20 from the slot outer end 26, each of the U-shaped conductor outer ends 21031 of the second coil group 120 in the stator winding 10 is located at the other side of the stator core 20 from the axial direction 26, and each of the U-shaped conductor outer ends 21031 of the third coil group 130 in the stator winding 10 is located at the other side of the stator core 20 from the axial direction 26;

further, as shown in fig. 7 to 10, the stator winding of the present embodiment further includes a turning portion 21021 of each U-shaped conductor in the second coil group 120 located on one side of the slot outer end 25 of the stator core 20, and a plurality of slot outer ends 21031 of each U-shaped conductor in the second coil group 120 of the stator winding 10 located on the other side of the axial direction 26 of the stator core 20;

illustratively, as shown in fig. 1 to 10, two radially adjacent slot outer ends 21031 of the stator winding 10 extend in opposite directions in the circumferential direction.

Optionally, on the basis of the above embodiment, with reference to fig. 3 to 4, in the stator winding 10, the extending directions of all the out-of-slot ends 21031 of the first coil group 110 in the stator core circumferential direction are the same and all extend clockwise (leftward), with reference to fig. 5 and 6, the extending directions of all the out-of-slot ends 21031 of the third coil group 130 in the stator core circumferential direction are the same and all extend counterclockwise (rightward), the extending directions of all the out-of-slot ends of the first coil group 110 in the stator core circumferential direction are opposite to the extending directions of all the out-of-slot ends of the third coil group 130 in the stator core circumferential direction, with reference to fig. 7 and 8, optionally, with reference to fig. 7 and 8, the extending directions of the out-of-slot ends of the second coil group 120 located in the stator core radial N-2 layer are the same and all extend counterclockwise (rightward), and the extending directions of the out-slot ends of the second coil group 120 The needle extends (to the right);

with reference to fig. 1, 3, 5, 7, and 9, in the stator winding, the outer slot end 21031 of the first coil group 110 is located on the first radial layer of the stator core 20 and extends leftward in the circumferential direction of the stator core, the first outer slot end 21031 of the second coil group 120 is located on the second radial layer of the stator core 20 and extends rightward in the circumferential direction of the stator core, the second outer slot end 21031 of the second coil group 120 is located on the third radial layer of the stator core 20 and extends leftward in the circumferential direction of the stator core, and the outer slot end 21031 of the third coil group 130 is located on the fourth radial layer of the stator core 20 and extends rightward in the circumferential direction of the stator core, so that it can be seen that the extending directions of two outer slot ends 21031 located radially adjacent to the stator core 20 are opposite in the circumferential direction of the stator core.

Illustratively, as shown in fig. 6, the two out-of-slot turns 21021 of the two U-shaped conductors 230 of the same adjacent slot in the third coil set 130 are turned in opposite directions.

Alternatively, on the basis of the above embodiment, with reference to fig. 6, the third coil group 130 has a U-phase coil group, a V-phase coil group, and a W-phase coil group, and taking the U-phase coil group in the third coil group 130 as an example for description, with reference to fig. 6, 11, and 12, the inside of the first slot of the U-shaped conductor 230-1 (i.e., U1) is located in the first slot of the stator core 20, and the inside of the second slot of the U-shaped conductor 230-1 is located in the forty-third slot of the stator core 20, that is, the turning direction of the out-slot turning portion 21021 connecting the inside of the two slots of the U-shaped conductor 230-1 is clockwise (i.e., leftward); further, the first slot interiors of the U-shaped conductors 230-2 (i.e., U2) of adjacent slots are located in the second slot of the stator core 20, and the second slot interiors of the U-shaped conductors 230-2 are located in the eighth slot of the stator core 20, i.e., the turning direction of the out-of-slot turns 21021 connecting the two slot interiors of the U-shaped conductors 230-2 is counterclockwise (i.e., to the right), so that it can be seen that the turning directions of the two out-of-slot turns 21021 of the two U-shaped conductors 230-1, 230-2 of the same-phase adjacent slot 21 in the third coil group 130 are opposite.

Illustratively, as shown in fig. 4, the two out-of-slot turns 21021 of two U-shaped conductors 210 of in-phase adjacent slots in the first coil group 110 have the same turning direction.

Alternatively, based on the above-described embodiment, with reference to fig. 4, the first coil group 110 has a U-phase coil group, a V-phase coil group, and a W-phase coil group, and now, with reference to fig. 4, 11, and 13, the U-phase coil group in the first coil group 110 is taken as an example for description, where the first slot interior of the U-shaped conductor 2101 (i.e., U1) is located in the first slot of the stator core 20, and the second slot interior of the U-shaped conductor 2102 is located in the eighth slot of the stator core 20, that is, the turning direction of the out-of-slot turning portion 21021 connecting the two slot interiors of the U-shaped conductor 2101 is counterclockwise (i.e., rightward); further, the first in-slot portions 21011 of the U-shaped conductors 2102 (i.e., U2) of the adjacent slots are located in the second slot of the stator core 20, and the second in-slot portions of the U-shaped conductors 2102 are located in the seventh slot of the stator core 20, that is, the turning direction of the out-of-slot turning portions 21021 connecting the two in-slot portions of the U-shaped conductors 2102 is counterclockwise (i.e., rightward), so that it can be seen that the turning directions of the two out-of-slot turning portions 21021 of the two U-shaped conductors 2101, 2102 of the same-phase adjacent slot 21 in the first coil group 110 are the same.

Illustratively, as shown in fig. 1 to 11, the first slot outer end 21031 and the second slot outer end 21031 have extending ends 5, except for the extending ends connected with the outgoing lead wires 4, N-1 layers of extending ends 5 located in the same radial direction of the stator core and adjacent to each other are connected with N layers of extending ends 5, where N is an even number.

Alternatively, on the basis of the above-mentioned embodiments, as shown in fig. 1 to 14, in this embodiment, each of the first outer slot end 21031 and the second outer slot end 21031 has an extending end 5, except the extending end 5 connected to the outgoing line 4 (the outgoing line in each embodiment of the present invention includes a phase terminal and a neutral point, that is, includes a phase U terminal, a phase V terminal, a phase W terminal, a phase neutral point, a phase V neutral point, and a phase W neutral point), the other extending ends of the first layer located in the same radial direction of the stator core and adjacent to each other are connected to the extending ends of the second layer, the extending ends of the third layer located in the same radial direction of the stator core and adjacent to each other are connected to the extending ends of the fourth layer, further, the extending ends of the two outer slot ends connected to the stator winding are located in the odd layer and the even layer radially adjacent to the stator core, in this embodiment, the positions of the extending end 5 connected to the terminal and the extending end 5 connected to the neutral, that is, the position of the terminal and the neutral point in the lead wire is not limited in this embodiment.

As shown in fig. 16, an embodiment of the present invention provides a 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 and spaced apart at predetermined slot pitches in a circumferential direction of the stator core;

as shown in fig. 16 to 17, a stator winding 10, which is mounted on a stator core 20, wherein the stator winding 10 is three-phase, and has Q number of pole pair coils, and Q/number of slots per pole per phase is equal to P, where P is an integer, and the number of slots per pole per phase is greater than or equal to 2, and each phase stator winding is connected in series with each phase-to-phase stator winding;

with reference to fig. 16 and 17, in the present embodiment, the stator winding 10 is a stator winding 10, and the stator winding 10 is mounted on a stator core 20, where the stator winding 10 is three-phase (i.e., U-phase, V-phase, and W-phase), and the number of slots per pole per phase is greater than or equal to 2;

in the present embodiment, three slots 21 are provided for each pole of the rotor, 3 slots per pole per phase in the present embodiment, the rotor has twelve poles and this is true for each phase of the three-phase stator winding 10, the rotor has one pole for each of the Q number of pole pair coils of the stator winding, Q is 6 in the present embodiment, 6/3 is 2, and accordingly, the number of slots 21 provided in the stator core 20 is equal to 108 (i.e., 3X12X 3).

Illustratively, as shown in fig. 16 and 17, the stator winding includes: the first coil group 110 and the third coil group 130 are sleeved from inside to outside in sequence;

with reference to fig. 16 and 17, in this embodiment, the first coil group 110 is disposed at an inner radial layer of the stator core, i.e., away from the inner radial surface of the stator core, in this embodiment, the first coil group 110 is located at a first radial layer of the stator core, the third coil group 130 is disposed at an outer radial layer of the stator core, i.e., close to the inner radial surface of the stator core, and in this embodiment, the third coil group 130 is located at a 6 th radial layer of the stator core; correspondingly, each coil group in the stator winding 10 may also be sequentially sleeved from inside to outside, the first coil group 110 is disposed at the radial inner layer of the stator core, i.e., close to the radial inner surface direction of the stator core, and the third coil group 130 is disposed at the radial inner layer of the stator core, i.e., far away from the radial inner surface direction of the stator core.

As shown in fig. 18 to 19, the first coil group 110 has a plurality of U-shaped conductors 210(2101, 2102), and the U-shaped conductors 210(2101, 2102) include: two outer slot ends 21031, the two outer slot ends 21031 are located in the same radial layer of the stator core 20, and the plurality of outer slot ends 21031 of the plurality of U-shaped conductors 210(2101, 2102) have the same extension direction in the circumferential direction of the stator core and the same span in the circumferential direction;

with reference to fig. 18 and 19, in the present embodiment, the first coil group 110 includes 54U-shaped conductors 210 (in the present embodiment, the 54U-shaped conductors 210 include 36U-shaped conductors 2101 and 18U-shaped conductors 2102), and the U-shaped conductors 210(2101 and 2102) include: the two outer slot ends 21031 of the U-shaped conductor 210(2101, 2102) in the embodiment have the same extension direction in the circumferential direction of the stator core, extend along the counterclockwise direction (leftward) and have the same span extending in the circumferential direction of the stator core, and in the embodiment, the span extending in the circumferential direction of the stator core is 4.5 slot pitches, that is, 4.5d slot pitches.

The two slot inner portions 21011 of the U-shaped conductor 210(2101, 2102) are located in two slots separated by a specified slot pitch, the two slot inner portions 21011 are located in the same radial layer of the stator core slot 21, i.e. away from the direction of the radially inner surface of the stator core, in the first layer of the stator core slot 21, and correspondingly, the slot outer end portion 21031 is also located in the same radial layer of the stator core, i.e. in the first layer of the stator core 20, in this embodiment, the first coil group is located in the radial layer 1 of the stator core, and correspondingly, the slot inner portion 21011 and the slot outer end portion 21031 in the first coil group are both located in the radial layer 1 of the stator core.

As shown in fig. 20 and 21, the third coil group 130 has a plurality of U-shaped conductors 230(2301), and the U-shaped conductors 230(2301) include: the two outer slot ends 21031 are positioned on the same radial layer of the stator core 20, the outer slot ends 21031 of the plurality of U-shaped conductors 230 have the same extension direction in the circumferential direction of the stator core and have the same span in the circumferential direction; two slot interiors 21011, the two slot interiors 21011 are located in two slots 21 of the same radial layer of the stator core 20 at a specified slot pitch; the plurality of slot interiors 21011 of the plurality of U-shaped conductors 230(2301) of the third coil group 230(2301) are located at the same radial layer of the stator core 20 in the circumferential direction of the stator core;

with reference to fig. 20 and 21, in the present embodiment, the third coil group 130 includes 54U-shaped conductors 230(2301), and the U-shaped conductors 230(2301) include: the two outer slot ends 21031 of the U-shaped conductor 230(2301) in the present embodiment extend in the circumferential direction of the stator core in a consistent direction, and both extend clockwise (rightward) and have the same span extending in the circumferential direction, and in the present embodiment, the span extending in the circumferential direction of the stator core is 4.5 slot pitches, that is, 4.5d slot pitches.

Two in-slot parts 21011 of the U-shaped conductor 230(2301) are located in two slots separated by a specified slot pitch, two in-slot parts 21011 are located in the same radial layer of the stator core slot 21, i.e. away from the direction of the radial inner surface of the stator core, in the nth layer of the stator core slot 21, and correspondingly, an out-slot part 21031 is also located in the same radial layer of the stator core, i.e. in the nth layer of the stator core slot, in this embodiment, a third coil group is located in the sixth radial layer of the stator core, and correspondingly, the in-slot parts 21011 and the out-slot parts 21031 in the third coil group are both located in the sixth radial layer of the stator core, and by using a small number of coil units, the arrangement mode is simple, the use of bus bars and bus bars can be reduced, the out-slot part twisting direction and the twisted slot pitch can be eliminated, and the branch and neutral points of each phase winding can be arranged in any slot layer, thereby reducing, the production cost is reduced, and the processing efficiency is improved.

Illustratively, as shown in fig. 16 to 21, the plurality of U-shaped conductors 210(2101, 2102) of the first coil group 110 further include: an outer-slot turn 21021, the outer-slot turn 21021 being located on the outer-slot end 25 side of the stator core 20 and connecting the two slot interiors 21011 of the plurality of U-shaped conductors 210(2101, 2102) of the first coil group 110; the plurality of U-shaped conductors 230(2301) of third coil set 130 further include: an outer-slot turn 21021, the outer-slot turn 21021 being located on the outer slot end 25 side of the stator core 20, and connecting the two slot inner portions 21011 of the plurality of U-shaped conductors 230(2301) of the third coil group 130; the slot pitch of the out-of-slot turns 21021 of the plurality of U-shaped conductors 210(2101, 2102) of the first coil group 110 is different from the out-of-slot turns 21021 of the plurality of U-shaped conductors 230(2301) of the third coil group 130.

With reference to fig. 17 to 21, the 54U-shaped conductors 210(2101, 2102) of the first coil group 110 in the present embodiment further include: an outer-slot turn 21021, the outer-slot turn 21021 being located on the outer-slot end 25 side of the stator core 20 and connecting to the corresponding two inner-slot portions 21011, further, the slot pitch between the two inner-slot portions 21011 of the 36U-shaped conductors 2101 of the 54U-shaped conductors 210 is X (X in this embodiment is 10), correspondingly, the slot pitch of the outer-slot turn 21021 connecting to the two inner-slot portions 21011 of the U-shaped conductors 2101 is X (X in this embodiment is 10), the slot pitch between the two inner-slot portions of the 16U-shaped conductors 2102 of the 54U-shaped conductors 210 is Y (Y in this embodiment is 7), and correspondingly, the slot pitch between the two inner-slot portions 21011 connecting to the U-shaped conductors 2102 is Y (Y in this embodiment is 7); the 54U-shaped conductors 230(2301) of third coil set 130 further include: an outer-slot turn 21021, the outer-slot turn 21021 being located on the outer-slot end 25 side of the stator core 20 and connecting the corresponding two inner-slot portions 21011, further, the slot pitch between the two inner-slot portions 21011 of the 54U-shaped conductors 230(2301) being 9, and correspondingly, the slot pitch of the outer-slot turn 21021 connecting the two inner-slot portions 21011 of the U-shaped conductors 230(2301) being 9; that is, the slot pitch of the out-of-slot turns 21021 of the 54U-shaped conductors 210(2101, 2102) of the first coil group 110 is different from the slot pitch of the out-of-slot turns 21021 of the 54U-shaped conductors 230 of the third coil group 130.

Illustratively, as shown in fig. 17, 22, 23, 24, and 25, the present invention further includes a second coil group 120 disposed between the first coil group 110 and the third coil group 130, the second coil group 120 includes a plurality of U-shaped conductors 220A (or 220B), and the U-shaped conductors 220A (220B) include: the two outer slot ends 21031 are positioned at two adjacent layers in the radial direction of the stator core 20, the outer slot ends 21031 of the plurality of U-shaped conductors 220A (220B) positioned at the same layer in the radial direction of the stator core 20 have the same extension direction in the circumferential direction of the stator core, and the spans in the circumferential direction are the same; the two slot interiors 21011, the two slot interiors 21011 are located in two slots 21 which are radially adjacent two layers and are separated by a specified slot distance in the stator core slot 21; the multi-slot inner parts 21011 of the plurality of U-shaped conductors 220A (or 220B) of the second coil group 120 are sequentially positioned at two radially adjacent layers in the stator core slot 21 along the circumferential direction of the stator core;

optionally, on the basis of the foregoing embodiment, as shown in fig. 17, fig. 22, fig. 23, fig. 24, and fig. 25 with reference to fig. 22 and fig. 23, in this embodiment, the second coil group 120 includes 108U-shaped conductors 220A (220B), and the U-shaped conductors 220A (220B) include: the stator core comprises a slot outer end 21031, a slot inner 21011, a slot outer turning part 21021, a slot inner 21011, a slot outer end 21031, two slot outer ends are respectively connected with the two slot inner parts 21011 positioned on the outer end 26 side of the stator core slot correspondingly in the same layer, the extending directions of the two slot outer ends 21031 of the U-shaped conductors 220A (2201, 2202) or 220B (2201) in the circumferential direction of the stator core are opposite, the slot outer ends 21031 positioned on the same layer in the radial direction of the stator core extend clockwise (leftwards) and have the same span extending in the circumferential direction, and the span extending in the circumferential direction of the stator core in the embodiment is 4.5 slot pitches, namely 4.5d slot pitches; the outer ends 21031 of the other slots positioned on the same layer of the stator core in the radial direction extend anticlockwise (rightward) and have the same span extending in the circumferential direction; the span extending in the circumferential direction of the stator core in the present embodiment is 4.5 slot pitches, i.e., 4.5d slot pitches.

The two slot inner portions 21011 of the U-shaped conductor 220A (220B) are located in two slots 21 separated by a specified slot pitch, the two slot inner portions 21011 are located in two radially adjacent layers of the stator core slot 21, i.e., on a side away from the radially inner surface of the stator core, in the N-1 st layer N-2 nd layer of the stator core 20, and correspondingly, the slot outer end portion 21031 is also located in two radially adjacent layers of the stator core 20, i.e., in the N-1 st layer N-2 nd layer, in this embodiment, the second coil group is located in the third layer second layer of the stator core, and correspondingly, the slot inner portion 21011 and the slot outer end portion 21031 in the second coil group are both located in the third layer second layer of the stator core.

Illustratively, as shown in fig. 18 and 19, the first coil group 110 includes: a plurality of first U-shaped conductors 2101 whose groove pitch of the out-of-groove turn 21021 is a long pitch; a plurality of second U-shaped conductors 2102 whose groove pitches of the out-of-groove turns 21021 are short pitches.

With reference to fig. 18 and 19, the first coil group 110 includes: further, the 54U-shaped conductors 210(2101, 2102) further, the 54U-shaped conductors 210 include 36 first U-shaped conductors 2101, a slot pitch between two slot inner portions 21011 of the 36 first U-shaped conductors 2101 is X (X is 10 in this embodiment), and accordingly, a slot pitch of an outside-slot turn 21021 connecting between the two slot inner portions 21011 of the first U-shaped conductors 2101 is X (X is 10 in this embodiment); the 54U-shaped conductors 210 further include 18 second U-shaped conductors 2102, and the slot pitch between the two slot interiors of the 18 second U-shaped conductors 2102 is Y (Y is 7 in this embodiment), and accordingly, the slot pitch between the two slot interiors 21011 connecting the second U-shaped conductors 2102 is Y (Y is 7 in this embodiment); in this embodiment, the U-shaped conductor having a slot pitch of 9 between the two slot interiors of the U-shaped conductor is a full pitch, the slot pitch of the U-shaped conductor is greater than 9 for a long pitch, and the slot pitch of the U-shaped conductor is less than 9 for a short pitch, and thus it can be seen that, in this embodiment, the first coil group 110 includes 36 first U-shaped conductors 2101, the slot pitch between the two slot interiors 21011 of the U-shaped conductors 2101 is a long pitch, and 18 second U-shaped conductors 2102, and the slot pitch between the two slot interiors 21011 of the U-shaped conductors 2102 is a short pitch.

Alternatively, as shown in fig. 20 and 21, the groove pitch of the out-of-groove bends 21021 of the plurality of U-shaped conductors 230(2301) of the third coil group 130 is a full pitch.

Optionally, on the basis of the above embodiment, as shown in fig. 20 and 21, in this embodiment, the third coil group 130 includes: 54U-shaped conductors 230(2301)

Further, the 54U-shaped conductors 230 include 54U-shaped conductors 2301, the slot pitch between the two slot inner portions 21011 of the 54U-shaped conductors 2301 is Z (Z is 9 in the present embodiment), and accordingly, the slot pitch of the out-of-slot turn 21021 connecting the two slot inner portions 21011 of the U-shaped conductors 2301 is Z (Z is 9 in the present embodiment); the U-shaped conductor having a slot pitch of 9 between the two slot interiors of the U-shaped conductor in this embodiment is a full pitch, and thus it can be seen that the slot pitch between the two slot interiors 21011 of the 54U-shaped conductors 2301 of the third coil group 130 is a full pitch in this embodiment.

Illustratively, as shown in fig. 24, the plurality of U-shaped conductors 210A of the first coil group 110 includes: a plurality of first U-shaped conductors 2101 whose groove pitch of the out-of-groove turn 21021 is a long pitch; a plurality of second U-shaped conductors 2102 whose groove pitches of the out-of-groove turns 21021 are short pitches.

Referring to fig. 24, the first coil group 110 includes: 54U-shaped conductors 210A (2101, 2102)

Further, the 54U-shaped conductors 210A include 18 first U-shaped conductors 2101, the slot pitch between the two slot inner portions 21011 of the 18 first U-shaped conductors 2101 is X (this embodiment X is 11), and correspondingly, the slot pitch of the out-of-slot turn 21021 connecting the two slot inner portions 21011 of the first U-shaped conductors 2101 is X (this embodiment X is 11); the 54U-shaped conductors 210 further include 36 second U-shaped conductors 2102, and the slot pitch between the two slot interiors of the 36 second U-shaped conductors 2102 is Y (Y is 8 in this embodiment), and accordingly, the slot pitch between the two slot interiors 21011 connecting the second U-shaped conductors 2102 is Y (Y is 8 in this embodiment); in the present embodiment, the U-shaped conductor having a slot pitch of 9 between the two slot interiors of the U-shaped conductor is a full pitch, the slot pitch of the U-shaped conductor is greater than 9 for a long pitch, and the slot pitch of the U-shaped conductor is less than 9 for a short pitch, and thus it can be seen that, in the present embodiment, the plurality of U-shaped conductors 210A of the first coil group 110 includes 18 first U-shaped conductors 2101, the slot pitch between the two slot interiors 21011 of the U-shaped conductors 2101 is a long pitch, and 36 second U-shaped conductors 2102, and the slot pitch between the two slot interiors 21011 of the U-shaped conductors 2102 is a short pitch.

Alternatively, as shown in fig. 19 and 23, the slot outside turn 21021 of the U-shaped conductors 220A (2201, 2202) of the second coil group 120 has the same slot pitch as the slot outside turn of the U-shaped conductors 210(2101, 2102) of the first coil group 110.

Alternatively, on the basis of the above-described embodiment, with reference to fig. 19 and 23, the slot pitch between the two inside-slot 21011 portions of 36U-shaped conductors 2101 in 54U-shaped conductors 210(2101 and 2102) in the first coil group 110 is X (X is 10 in this embodiment), accordingly, the slot pitch of the outside-slot turn 21021 connecting the two inside-slot 21011 portions of the U-shaped conductors 2101 is X (X is 10 in this embodiment), the slot pitch between the two inside-slot portions of 18U-shaped conductors 2102 in 54U-shaped conductors 210 is Y (Y is 7 in this embodiment), and accordingly, the slot pitch between the two inside-slot 21011 portions connecting the U-shaped conductors 2102 is Y (Y is 7 in this embodiment); a slot pitch between two slot inner portions 21011 of 72U-shaped conductors 2201 in 108U-shaped conductors 220A (2201, 2202) of the second coil group 120 is X (X is 10 in this embodiment), and accordingly, a slot pitch of an outside-slot turn 21021 connecting the two slot inner portions 21011 of the U-shaped conductors 2201 is X (X is 10 in this embodiment), a slot pitch between two slot inner portions of 36U-shaped conductors 2102 in 108U-shaped conductors 220A is Y (Y is 7 in this embodiment), and accordingly, a slot pitch between the two slot inner portions 21011 connecting the U-shaped conductors 2102 is Y (Y is 7 in this embodiment); as can be seen, in the present embodiment, the out-of-slot bends 21021 of the 108U-shaped conductors 220A (2201, 2202) of the second coil 120 have the same slot pitch as the out-of-slot bends of the 54U-shaped conductors 210(2201, 2202) of the first coil group 110.

Alternatively, as shown in fig. 21 and 25, the slot pitches of the out-slot bent portions 21021 of the U-shaped conductors 220B (2201) of the second coil group 120 and the out-slot bent portions 21021 of the U-shaped conductors 230(2301) of the third coil group 130 are the same.

Alternatively, on the basis of the above-described embodiment, with reference to fig. 6 and 10, the slot pitch between the two slot inner portions 21011 of the 54U-shaped conductors 230(2301) of the third coil group 130 is Z (Z is 9 in this embodiment), and correspondingly, the slot pitch of the out-slot turn 21021 connecting the two slot inner portions 21011 of the U-shaped conductors 2301 is Z (Z is 9 in this embodiment); a slot pitch between the two slot inner portions 21011 of the 108U-shaped conductors 220B (2201) of the second coil group 120 is Z (Z is 9 in the present embodiment), and accordingly, a slot pitch of the outside-slot turn 21021 connecting the two slot inner portions 21011 of the U-shaped conductor 2201 is Z (Z is 9 in the present embodiment); as can be seen, in the present embodiment, the out-slot bends 21021 of the 108U-shaped conductors 220B (2201) of the second coil 120 have the same slot pitch as the out-slot bends of the 54U-shaped conductors 230(2301) of the third coil group 130.

Illustratively, as shown in fig. 16-25, the turn 21021 of each U-shaped conductor of each coil group of the stator winding 10 is located on one side of the stator core 20 slot outer end 25, and the plurality of slot outer ends 21031 of each U-shaped conductor of each coil group of the stator winding 10 are located on the other side of the stator core 20 slot outer end 26.

Alternatively, on the basis of the above-mentioned embodiment, with reference to fig. 16 to 25, in this embodiment, the bent portion 21021 of each U-shaped conductor in the first coil group 110 in the stator winding 10 is located on one side of the outer end 25 of the slot of the stator core 20, and the bent portion 21021 of each U-shaped conductor in the third coil group 130 in the stator winding is located on one side of the outer end 25 of the slot of the stator core 20; each of the U-shaped conductor outer ends 21031 of the first coil group 110 in the stator winding 10 is located at the other side of the stator core 20 from the slot outer end 26, each of the U-shaped conductor outer ends 21031 of the second coil group 120 in the stator winding 10 is located at the other side of the stator core 20 from the axial direction 26, and each of the U-shaped conductor outer ends 21031 of the third coil group 130 in the stator winding 10 is located at the other side of the stator core 20 from the axial direction 26;

further, as shown in fig. 22 to 25, the stator winding of the present embodiment further includes a turning portion 21021 of each U-shaped conductor in the second coil group 120 located on one side of the slot outer end 25 of the stator core 20, and a plurality of slot outer ends 21031 of each U-shaped conductor in the second coil group 120 in the stator winding 10 located on the other side of the axial direction 26 of the stator core 20;

illustratively, as shown in fig. 16 to 25, the two radially adjacent slot outer ends 21031 of the stator winding 10 extend in opposite directions in the circumferential direction.

Optionally, on the basis of the above-described embodiment, with reference to fig. 18 to 19, in the stator winding 10, the extending directions of all the out-slot ends 21031 of the first coil group 110 in the stator core circumferential direction are the same and all extend counterclockwise (to the right), with reference to fig. 20 and 21, the extending directions of all the out-slot ends 21031 of the third coil group 130 in the stator core circumferential direction are the same and all extend clockwise (to the left), the extending directions of all the out-slot ends of the first coil group 110 in the stator core circumferential direction are opposite to the extending directions of all the out-slot ends of the third coil group 130 in the stator core circumferential direction, with reference to fig. 22 and 23, optionally, with reference to fig. 22 and 23, the extending directions of the out-slot ends of the second coil group 120 located in the stator core radial N-2 layer are the same and all extend counterclockwise (to the left), and the extending directions of the out-slot ends of the second coil group 120 located in the stator core radial N-1 layer The needle extends (leftwards);

with reference to fig. 16, 18, 20, 22 and 24, in the stator winding, the out-of-slot end 21031 of the first coil group 110 is located at the first radial layer of the stator core 20 and extends to the right in the circumferential direction of the stator core, the first out-of-slot end 21031 of the second coil group 120 is located at the second radial layer of the stator core 20 and extends to the left in the circumferential direction of the stator core, the second out-of-slot end 21031 of the second coil group 120 is located at the third radial layer of the stator core 20 and extends to the right in the circumferential direction of the stator core, and the out-of-slot end 21031 of the third coil group 130 is located at the fourth radial layer of the stator core 20 and extends to the left in the circumferential direction of the stator core, so that the extending directions of two out-of-slot ends 21031 located radially adjacent to the stator core.

Illustratively, as shown in fig. 21, the two out-of-slot turns 21021 of the two U-shaped conductors 230 of the same adjacent slot in the third coil set 130 are turned in opposite directions.

Alternatively, on the basis of the above-described embodiment, with reference to fig. 21, the third coil group 130 has a U-phase coil group, a V-phase coil group, and a W-phase coil group, and now the U-phase coil group in the third coil group 130 is taken as an example for description, with reference to fig. 21, 24, and 25, the inside of the first slot of the U-shaped conductor 230-1 (i.e., U1) is located in the first slot of the stator core 20, and the inside of the second slot of the U-shaped conductor 230-1 is located in the tenth slot of the stator core 20, that is, the turning direction of the out-slot turning portion 21021 connecting the inside of the two slots of the U-shaped conductor 230-1 is counterclockwise (i.e., rightward); further, the first slot inside of the U-shaped conductor 230-2 (i.e., U2) of the adjacent slot is located in the second slot of the stator core 20, the second slot inside of the U-shaped conductor 230-2 is located in the eleventh slot of the stator core 20, i.e., the turning direction of the out-of-slot turn 21021 connecting the two slot insides of the U-shaped conductor 230-2 is in the counterclockwise (i.e., right) direction, further, the first slot inside of the U-shaped conductor 230-3 (i.e., U3) of the adjacent slot is located in the third slot of the stator core 20, the second slot inside of the U-shaped conductor 230-3 is located in the first one-hundred-two slots of the stator core 20, i.e., the turning direction of the out-of-slot turn 21021 connecting the two slot insides of the U-shaped conductor 230-3 is in the clockwise (i.e., left),

it can be seen that the two out-of-slot turns 21021 of two of the three U-shaped conductors 230-2, 230-3 of the same adjacent slot 21 in the third coil set 130 turn in opposite directions.

Illustratively, as shown in fig. 19, the two out-of-slot turns 21021 of two U-shaped conductors 210 of in-phase adjacent slots in the first coil group 110 have the same turning direction.

Alternatively, on the basis of the above-described embodiment, with reference to fig. 19, the first coil group 110 has a U-phase coil group, a V-phase coil group, and a W-phase coil group, and taking the U-phase coil group in the first coil group 110 as an example for description, with reference to fig. 19, 24, and 26, the inside of the first slot of the U-shaped conductor 2101 (i.e., U1) is located in the first slot of the stator core 20, and the inside of the second slot of the U-shaped conductor 2102 is located in the eleventh slot of the stator core 20, that is, the turning direction of the out-of-slot turn 21021 connecting the inside of the two slots of the U-shaped conductor 2101 is the counterclockwise (i.e., the right) direction; further, the first in-slot portion 21011 of the U-shaped conductor 2102 (i.e., U2) of the adjacent slot is located in the second slot of the stator core 20, the second in-slot portion of the U-shaped conductor 2102 is located in the twelfth slot of the stator core 20, i.e., the turning direction of the out-of-slot turning portion 21021 connecting the two in-slot portions of the U-shaped conductor 2102 is in the counterclockwise (i.e., right) direction, further, the first in-slot portion 21011 of the U-shaped conductor 2103 (i.e., U3) of the adjacent slot is located in the third slot of the stator core 20, and the third in-slot portion 2103 of the U-shaped conductor 2103 is located in the tenth slot of the stator core 20, i.e., the turning direction of the out-of-slot turning portion 21021 connecting the two in-slot portions of the U-shaped conductor 2102 is in the counterclockwise (i.e., right) direction, whereby it can be seen that the turning directions of the two out-of-slot turning portions 21021 of the three U-shaped conductors 2101, 2102.

Illustratively, as shown in fig. 16-26, the first slot outer end 21031 and the second slot outer end 21031 have extending ends 5, except the extending ends connected with the outgoing lines 4, N-1 layers of extending ends 5 located in the same radial direction of the stator core and adjacent to each other are connected with N layers of extending ends 5, where N is an even number.

Alternatively, on the basis of the above-mentioned embodiments, as shown in fig. 16 to 26, in this embodiment, the first outer slot end 21031 and the second outer slot end 21031 both have the extending end 5, except the extending end 5 connected to the outgoing line 4, (the outgoing line of each embodiment of the present invention includes the phase terminals and the neutral point, that is, the phase terminals including the phase terminal U, the phase terminal V, the phase terminal W, the phase neutral point U, the phase neutral point V, and the phase neutral point W) the other extending ends of the first layer and the second layer which are located in the same radial direction of the stator core and adjacent to each other are connected to each other, the extending ends of the third layer and the fourth layer which are located in the same radial direction of the stator core and adjacent to each other are connected to each other, and further, the extending ends of the outer ends of the two slots connected to each other in the stator winding are located in the odd-numbered layer and the even-numbered layer which are radially adjacent to the stator core, in the present embodiment, the positions of the extending end 5 connected to the terminal and the extending end 5 connected to the neutral point in the lead wire 4 may be interchanged, that is, the positions of the terminal and the neutral point in the lead wire are not limited in the present embodiment.

Further, referring to fig. 28, in this embodiment, the stator winding 10 is star-connected, U-phase winding, V-phase winding, and W-phase winding, and referring to fig. 15, the U-phase winding includes two branches U1 and U2 connected in series, each branch is connected in series to form a U-phase lead-out line of the U-phase and a U-phase neutral point, and the V-phase winding, the W-phase winding and the U-phase winding are connected in the same manner, which is not described again;

the manufacturing method comprises the following steps:

exemplarily, as shown in fig. 1, the stator winding 10 is star-connected, U-phase winding, V-phase winding, and W-phase winding, two branches U1 and U2 are connected in series in the U-phase winding, each branch is connected in series, the V-phase winding and the W-phase winding are connected in the same manner as the U-phase winding, and details are not repeated;

the stator winding is sequentially provided with a first coil group 110, a second coil group 120, a third coil group 130 (the second coil group can be provided with 0, 1, 2 and 3, and any integer value);

illustratively, as shown in fig. 1 to 4, the first coil group 110 is composed of a U-phase first coil group, a V-phase first coil group, and a W-phase first coil group, each phase first coil group 110 is 8U-shaped conductors 210, the three-phase first coil group is 24U-shaped conductors 210, and further, the 24U-shaped conductors 210 of the first coil group are further divided into 12 first

U-shaped conductors

2101 and 12 second U-shaped conductors 2102;

referring to fig. 3 and 4, first, 24U-shaped conductors 210(12 first

U-shaped conductors

2101 and 12 second U-shaped conductors 2102) are inserted into 48 adjacent slots of the other end 26 of the stator core from one end 25 of the stator core, a first U-shaped conductor 2101-1 (the first U-shaped conductor of the U-phase) is inserted into the first layer of the first slot of the stator core, the first layer of the eighth slot, a second U-shaped conductor 2102-1 (the first second U-shaped conductor of the U-phase) is inserted into the first layer of the second slot of the stator core, the first layer of the seventh slot,

the first U-shaped conductor 2101-2 (the first U-shaped conductor of the W-phase) is inserted into the first layer in the fifth slot, the first layer in the twelfth slot of the stator core, the second U-shaped conductor 2102-2 (the first second U-shaped conductor of the W-phase) is inserted into the first layer in the sixth slot, the first layer in the eleventh slot,

the first U-shaped conductor 2101-3 (the first U-shaped conductor for the V-phase) is inserted into the first layer in the ninth slot, the first layer in the sixteenth slot of the stator core, the second U-shaped conductor 2102-3 (the first second U-shaped conductor for the V-phase) is inserted into the first layer in the tenth slot, the first layer in the fifteenth slot,

the first U-shaped conductor 2101-4 (the second first U-shaped conductor of the U-phase) is inserted into the first layer in the thirteenth slot, the first layer in the twentieth slot of the stator core, the second U-shaped conductor 2102-4 (the second U-shaped conductor of the U-phase) is inserted into the first layer in the fourteenth slot, the first layer in the nineteenth slot of the stator core,

until the first U-shaped conductor 2101-12 (the fourth first U-shaped conductor for the V-phase) is inserted into the first layer in the forty-fifth slot, the first layer in the fourth slot, and the second U-shaped conductor 2102-12 (the fourth second U-shaped conductor for the V-phase) is inserted into the first layer in the forty-sixth slot, the first layer in the third slot of the stator core;

illustratively, as shown in fig. 1 to 8, next, the second coil group 120 is composed of a U-phase second coil group, a V-phase second coil group, and a W-phase second coil group, each of the phase second coil groups 120 is 16U-shaped conductors 220A, the three-phase second coil group 120 is 48U-shaped conductors 220A, and further, the 48U-shaped conductors 220A of the second coil group 120 are further divided into 24 first

U-shaped conductors

2201 and 24 second U-shaped conductors 2202;

referring to fig. 7 and 8, first, 48U-shaped conductors 220A (24 first

U-shaped conductors

2201 and 24 second U-shaped conductors 2202) are inserted into the 48 adjacent slots of the other end 26 of the stator core from one end 25 of the stator core, the first U-shaped conductor 2201-1 (the first U-shaped conductor of the U-phase) is inserted into the third layer in the first slot of the stator core, the second layer in the eighth slot, the second U-shaped conductor 2202-1 (the first second U-shaped conductor of the U-phase) is inserted into the third layer in the second slot of the stator core, the second layer in the seventh slot,

the first U-shaped conductor 2201-2 (the first U-shaped conductor of the W-phase) is inserted into the third layer in the third slot, the second layer in the tenth slot of the stator core, the second U-shaped conductor 2102-2 (the first second U-shaped conductor of the W-phase) is inserted into the third layer in the fourth slot, the second layer in the ninth slot of the stator core,

the first U-shaped conductor 2201-3 (the first U-shaped conductor of the V-phase) is inserted into the third layer in the fifth slot, the second layer in the twelfth slot of the stator core, the second U-shaped conductor 2202-3 (the first second U-shaped conductor of the V-phase) is inserted into the third layer in the sixth slot, the second layer in the eleventh slot,

the first U-shaped conductor 2201-4 (the second first U-shaped conductor of the U-phase) is inserted into the third layer in the seventh third slot, the second layer in the fourteenth slot, the second U-shaped conductor 2202-4 (the second U-shaped conductor of the U-phase) is inserted into the third layer in the eighth slot, the second layer in the thirteenth slot,

until the first U-shaped conductors 2201-24 (the eighth first U-shaped conductor of the V phase) are inserted into the first layer in the forty-seventh slot, the second layer in the fifth slot, the second U-shaped conductors 2102-12 (the eighth second U-shaped conductor of the V phase) are inserted into the third layer in the forty-eighth slot and the second layer in the fourth slot of the stator core;

illustratively, as shown in fig. 1-6, the third coil group 130 is composed of a U-phase first coil group, a V-phase first coil group, a W-phase first coil group, each phase first coil group 130 is 8U-shaped conductors 230, and a three-phase first coil group is 24U-shaped conductors 230;

first, 24U-shaped conductors 230 are inserted into the 48 adjacent slots at the other end 26 of the stator core from one end 25 of the stator core, the U-shaped conductor 230-1 (the first U-shaped conductor of the U-phase) is inserted into the fourth layer in the first slot, the fourth layer in the forty-third slot, the U-shaped conductor 230-2 (the second U-shaped conductor of the U-phase) is inserted into the fourth layer in the second slot, the fourth layer in the eighth slot,

the U-shaped conductor 230-3 (the first U-shaped conductor of the W-phase) is inserted into the fourth layer in the fifth slot, the fourth layer in the seventeenth slot, the U-shaped conductor 230-4 (the second U-shaped conductor of the W-phase) is inserted into the fourth layer in the sixth slot, the fourth layer in the twelfth slot,

the U-shaped conductor 230-5 (the first U-shaped conductor of the V-phase) is inserted into the fourth layer in the ninth slot, the fourth layer in the third slot, the U-shaped conductor 230-6 (the second U-shaped conductor of the V-phase) is inserted into the fourth layer in the tenth slot, the fourth layer in the sixteenth slot,

until the U-shaped conductors 230-23 (the seventh U-shaped conductor of the V-phase) are inserted into the fourth layer in the fifteenth slot and the fourth layer in the eighteenth slot of the stator core, and the U-shaped conductors 230-24 (the eight U-shaped conductors of the V-phase) are inserted into the fourth layer in the sixteenth slot and the fourth layer in the fourth slot of the stator core;

as shown in fig. 1 to 8, finally, the stator winding is located inside the slot 21011 of the stator core slot 21 and extends axially to the outside of the other end 26 of the stator core 20, the outer slot end (i.e., the outer slot end of the first coil group 110) located on the first layer outside the stator core slot is bent clockwise (leftward) in the same circumferential direction of the stator core and extends for 3 slot pitches (i.e., 3d), correspondingly, the outer slot end (i.e., the outer slot end of the second coil group 120) located on the second layer outside the stator core slot is bent counterclockwise (rightward) in the same circumferential direction of the stator core and extends for 3 slot pitches (i.e., 3d), correspondingly, the outer slot end (i.e., the outer slot end of the second coil group 120) located on the third layer outside the stator core slot extends and extends clockwise (leftward) in the same circumferential direction of the stator core and extends for 3 slot pitches (i.e., 3d), and correspondingly, the outer slot end (i.e., the outer slot end of the third coil group 130) And one direction is bent anticlockwise (rightward) and extends for 3 groove pitches (namely 3d) to form a three-phase stator winding.

Further, with reference to the planar development of fig. 15, from the arrangement position relationship of a U-phase winding in the stator winding 10, the stator winding 10 is in a star connection, and the U-phase winding, the V-phase winding and the W-phase winding are connected in series by two branches U1 and U2, and each branch is connected in series, and the V-phase winding and the W-phase winding are connected in the same manner as the U-phase winding, which is not repeated;

further, a terminal of a U in a U-phase winding of the three-phase stator winding may be connected to one outer slot end 21031 of any layer of a slot in the U-phase winding, a neutral point may be connected to the outer slot end 21031 connected to the terminal of the U in the U-phase winding, which is radially adjacent to the outer slot end 21031, in this embodiment, the terminal of the U in the U-phase winding is connected to one outer slot end 21031 located at an adjacent outer slot end 21031 of a radially second layer, the neutral point in the U-phase winding is connected to one outer slot end 21031 located at one outer slot end 21031 of a radially adjacent first layer, and the other two radially adjacent outer slot ends are connected to form the stator winding. In the embodiment, the connection positions of the terminals of each phase and the neutral point can be interchanged; the coil units used are few in types and simple in arrangement mode, the use of bus bars and bus bars can be reduced, the inconsistency of the twisting direction of the outer end part of the groove and the distance between the twisting grooves can be eliminated, the branch and the neutral point of each phase winding are arranged on any layer of any groove, the complexity of the manufacturing process is further reduced, the production cost is reduced, and the processing efficiency is improved.

As shown in fig. 14, the stator winding 10 includes a first coil assembly 110, a second coil assembly 120 (a second coil assembly 120 formed by a plurality of U-shaped conductors 220A), and a third coil assembly 130, and the structure thereof is described in the above embodiments and is not repeated herein. In the embodiment, the connection positions of the terminals of each phase and the neutral point can be interchanged; the coil units used are few in types and simple in arrangement mode, the use of bus bars and bus bars can be reduced, the inconsistency of the twisting direction of the outer end part of the groove and the distance between the twisting grooves can be eliminated, the branch and the neutral point of each phase winding are arranged on any layer of any groove, the complexity of the manufacturing process is further reduced, the production cost is reduced, and the processing efficiency is improved.

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 "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the two elements may be mechanically or electrically connected, directly or indirectly connected through an intermediate medium, or connected through a communication path between the two elements. 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 particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An electric machine stator comprising:

a stator winding mounted on the stator core,

wherein the first coil set has a plurality of U-shaped conductors, the U-shaped conductors comprising:

the two slot interiors are positioned in two slots which are in the same layer in the radial direction of the stator core and are separated by a specified slot distance; and the inner parts of the plurality of grooves of the plurality of U-shaped conductors of the third coil group are sequentially positioned on the same radial layer of the stator core along the circumferential direction.

2. The electric machine stator of claim 1, wherein the plurality of U-shaped conductors of the first coil group further comprises: an out-of-slot turn located at an outer end of a stator core slot connecting two slots of the plurality of U-shaped conductors of the first coil assembly;

3. The electric machine stator of claim 1, further comprising a second coil assembly disposed between the first coil assembly and a third coil assembly, the second coil assembly comprising a plurality of U-shaped conductors, the U-shaped conductors comprising:

the two slot interiors are positioned in two slots which are formed in two adjacent layers of the stator core in the radial direction and are separated by a specified slot distance; the inner parts of the multiple grooves of the U-shaped conductors of the second coil group are sequentially positioned on two layers of inner radial adjacent stator core grooves along the circumferential direction of the stator core.

4. The electric machine stator of claim 2, wherein the plurality of U-shaped conductors of the first coil group comprise: a plurality of first U-shaped conductors having a long pitch of a groove pitch of an outside-groove turn portion;

5. The stator according to claim 4, wherein the slot pitch of the out-of-slot turns of the first plurality of U-shaped conductors is 7, and the slot pitch of the out-of-slot turns of the second plurality of U-shaped conductors is 5.

6. The stator according to claim 4, wherein the slot pitch of the out-of-slot turns of the first plurality of U-shaped conductors is 10, and the slot pitch of the out-of-slot turns of the second plurality of U-shaped conductors is 7.

7. The stator according to claim 4, wherein the slot pitch of the out-of-slot turns of the first plurality of U-shaped conductors is 11, and the slot pitch of the out-of-slot turns of the second plurality of U-shaped conductors is 8.

8. The stator according to claim 2, wherein the groove pitch of the out-of-groove turns of the U-shaped conductors of the third coil group is a full pitch.

9. The electric machine stator of claim 8, wherein the plurality of U-shaped conductors have an out-of-slot turn with a slot pitch of 6.

10. The electric machine stator of claim 8, wherein the plurality of U-shaped conductors have an outside-slot turn with a slot pitch of 9.

11. The electric machine stator of claim 3, wherein the out-of-slot turns of the plurality of U-shaped conductors of the second coil group have the same slot pitch as the out-of-slot turns of the plurality of U-shaped conductors of the first coil group.

12. The electric machine stator of claim 3, wherein the out-of-slot turns of the plurality of U-shaped conductors of the second coil group have the same slot pitch as the out-of-slot turns of the plurality of U-shaped conductors of the third coil group.

13. A machine stator according to any of claims 1 or 3, wherein the turn of each U-shaped conductor of each coil group of the stator winding is located on one side of the outer end of the stator core slot, and the plurality of out-of-slot ends of each U-shaped conductor of each coil group of the stator winding are located on the other side of the outer end of the stator core slot.

14. A stator for an electric machine according to claim 1 or 3, wherein the outer ends of two slots of the stator winding which are radially adjacent to the stator core extend in opposite directions in the circumferential direction.

15. An electric machine stator according to claim 2, characterized in that the two out-of-slot turns of the two U-shaped conductors of the same-phase adjacent slot in the third coil group are in opposite directions of turning.

16. The stator according to claim 15, wherein the two out-of-slot turns of two U-shaped conductors of the same-phase adjacent slots in the first coil group have the same turning direction.

17. The electric machine stator of claim 13, wherein the first slot outer end and the second slot outer end have extension ends, and N-1 layers of extension ends located in the same radial direction of the stator core and adjacent to each other except for the extension ends connected to the lead wires are connected to N layers of extension ends, where N is an even number.

18. An electric machine, comprising: a rotor and a stator of an electrical machine as claimed in any one of claims 1 to 17.