CN111555505A - Motor stator and motor - Google Patents

Abstract

The invention discloses a motor stator and a motor, wherein the stator core is provided with a plurality of grooves which are formed on the radial inner surface of the stator core and are spaced at preset groove intervals along the circumferential direction of the stator core; the stator winding is arranged on the stator iron core; stator winding is the three-phase, and each phase stator winding is along stator core circumference parallel connection in proper order, and stator winding includes: the first coil group, the at least one second coil group and the third coil group are sequentially sleeved along the radial direction of the stator iron core; the winding structure adopts a completely symmetrical structure on a magnetic circuit, so that the problem of circulating current generated by an asymmetrical structure is solved; the inter-phase busbars are omitted, direct connection between the phases is achieved, 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 reduced, the production cost is reduced, the material cost is reduced, and the processing efficiency is improved.

Description

Motor stator and motor

Technical Field

The embodiment of 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, the arrangement mode is complex, a large number of bus bars and bus bars are needed to be used for connecting branches and neutral points of windings of each phase, the manufacturing process is complex, the production cost is high, and the processing efficiency is low.

Disclosure of Invention

The winding structure adopts a completely symmetrical structure on a magnetic circuit, so that the problem of circulating current generated by an asymmetrical structure is solved; the inter-phase busbars are omitted, direct connection between the phases is achieved, 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 reduced, the production cost is reduced, the material cost is reduced, and the processing efficiency is improved.

The present invention provides a motor stator, comprising:

an electric machine stator comprising:

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

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

wherein, two at least branch winding along stator core circumference in every phase winding are connected in parallel in proper order, and stator winding includes: the stator comprises a stator core, a first coil group, at least one second coil group, at least one third coil group and a fourth coil group which are sequentially sleeved along the radial direction of the stator core, or the first coil group, the at least one third coil group, the at least one second coil group and the fourth coil group which are sequentially sleeved along the radial direction of the stator core;

wherein, first coil group has a plurality of first U-shaped conductor group, and first U-shaped conductor group includes: the stator core comprises a first large U-shaped conductor and a first small U-shaped conductor, wherein the first large U-shaped conductor and the first small U-shaped conductor are positioned in circumferentially adjacent slots of the stator core; the first large U-shaped conductor surrounds the first small U-shaped conductor;

the second coil group is provided with a plurality of second U-shaped conductors;

the third coil group has a plurality of third U-shaped conductor groups, the third U-shaped conductor groups including: the third large U-shaped conductor and the third small U-shaped conductor are positioned in circumferentially adjacent slots of the stator core; the third large U-shaped conductor surrounds the third small U-shaped conductor;

the fourth coil group has a plurality of fourth U-shaped conductors;

each U-shaped conductor includes: inside the two grooves;

the outer slot bending part is positioned at one axial end of the stator core and is connected with the insides of the two slots;

the outer ends of the two slots are positioned at the axial other end of the stator core and connected with the insides of the two slots on the same layer, and the outer ends of the slots positioned on the same layer in the radial direction of the stator core extend along the circumferential direction of the stator core by the same slot pitch and in the same extending direction; the outer end parts of the slots positioned on two layers of radial adjacent stator iron cores are opposite in the circumferential extension direction of the stator iron cores;

the pitch of the out-of-slot turn of the first large U-shaped conductor of the first U-shaped conductor set of the first coil set is the same as the pitch of the out-of-slot turn of the third large U-shaped conductor of the third U-shaped conductor set of the third coil set; the pitch of the out-of-slot turn of the second U-shaped conductor of the second coil assembly is the same as the pitch of the out-of-slot turn of the fourth U-shaped conductor of the fourth coil assembly.

Furthermore, the plurality of slots of the plurality of first U-shaped conductor groups of the first coil group are positioned in the same radial layer of the stator core; the plurality of slots of the plurality of fourth U-shaped conductors of the fourth coil group are positioned at the same radial layer of the stator core.

Further, the pitch of the out-of-groove turning part of the first large U-shaped conductor of the first U-shaped conductor group of the first coil group is a long pitch, and the pitch of the out-of-groove turning part of the first small U-shaped conductor of the first U-shaped conductor group of the first coil group is a short pitch; the pitch of the out-of-slot turn of the third large U-shaped conductor of the third U-shaped conductor set of the third coil set is a long pitch, and the pitch of the out-of-slot turn of the third small U-shaped conductor of the third U-shaped conductor set of the third coil set is a short pitch.

Further, the pitch of the out-of-slot turn of the first large U-shaped conductor of the first U-shaped conductor set of the first coil set is 7, the pitch of the out-of-slot turn of the first small U-shaped conductor of the first U-shaped conductor set of the first coil set is 5, the pitch of the out-of-slot turn of the third large U-shaped conductor of the third U-shaped conductor set of the third coil set is 7, and the pitch of the out-of-slot turn of the third small U-shaped conductor of the third U-shaped conductor set of the third coil set is 5.

Further, the pitch of the out-of-slot turn of the second U-shaped conductor of the second coil group is a full pitch, and the out-of-slot turn of the fourth U-shaped conductor of the fourth coil group is a full pitch.

Further, the pitch of the out-of-slot turn of the second U-shaped conductor of the second coil group is 6, and the out-of-slot turn of the fourth U-shaped conductor of the fourth coil group is 6.

Further, the outer ends of the two slots of the second U-shaped conductor of the second coil group are located in the opposite and far away directions of the circumferential extension of the stator core; two out-of-slot ends of a third large U-shaped conductor of a third U-shaped conductor group of the third coil group are located at opposite circumferential extension directions of the stator core and are far away from the stator core, and two out-of-slot ends of a third small U-shaped conductor of the third U-shaped conductor group of the third coil group are located at opposite circumferential extension directions of the stator core and are far away from the stator core.

Further, the outer ends of two slots of a second U-shaped conductor of the second coil group are located in opposite and close circumferential extension directions of the stator core; two out-of-slot ends of a third large U-shaped conductor of a third U-shaped conductor group of the third coil group are located at the opposite and close positions of the circumferential extension direction of the stator core, and two out-of-slot ends of a third small U-shaped conductor of the third U-shaped conductor group of the third coil group are located at the opposite and close positions of the circumferential extension direction of the stator core.

Furthermore, the outer end part of the slot of the stator winding is provided with an extending end, except the extending end connected with the outgoing line, the extending end of the outer end part of the slot of the N-1 layers which are adjacent to each other in the same radial direction of the stator core is connected with the extending end of the outer end part of the slot of the N layers, the pitch of the two connected outer end parts of the slot which are arranged on the outer circumferential direction of the slot of the stator core is a whole pitch, and N is an even number.

The present invention also provides a motor comprising: a rotor and a motor stator as described above.

By applying the technical scheme of the invention, the motor stator and the motor are as follows: a stator core having a plurality of slots formed on a radially inner surface thereof and spaced apart at predetermined slot pitches in a circumferential direction of the stator core; a stator winding including a plurality of phase windings mounted on the stator core so as to be different from each other in electrical phase; wherein, two at least branch winding along stator core circumference in every phase winding are connected in parallel in proper order, and stator winding includes: the stator comprises a stator core, a first coil group, at least one second coil group, at least one third coil group and a fourth coil group which are sequentially sleeved along the radial direction of the stator core, or the first coil group, the at least one third coil group, the at least one second coil group and the fourth coil group which are sequentially sleeved along the radial direction of the stator core; wherein, first coil group has a plurality of first U-shaped conductor group, and first U-shaped conductor group includes: the stator core comprises a first large U-shaped conductor and a first small U-shaped conductor, wherein the first large U-shaped conductor and the first small U-shaped conductor are positioned in circumferentially adjacent slots of the stator core; the first large U-shaped conductor surrounds the first small U-shaped conductor; the second coil group is provided with a plurality of second U-shaped conductors; the third coil group has a plurality of third U-shaped conductor groups, the third U-shaped conductor groups including: the third large U-shaped conductor and the third small U-shaped conductor are positioned in circumferentially adjacent slots of the stator core; the third large U-shaped conductor surrounds the third small U-shaped conductor; the fourth coil group has a plurality of fourth U-shaped conductors; each U-shaped conductor includes: inside the two grooves; the outer slot bending part is positioned at one axial end of the stator core and is connected with the insides of the two slots; the outer ends of the two slots are positioned at the axial other end of the stator core and connected with the insides of the two slots on the same layer, and the outer ends of the slots positioned on the same layer in the radial direction of the stator core extend along the circumferential direction of the stator core by the same slot pitch and in the same extending direction; the outer end parts of the slots positioned on two layers of radial adjacent stator iron cores are opposite in the circumferential extension direction of the stator iron cores; the pitch of the out-of-slot turn of the first large U-shaped conductor of the first U-shaped conductor set of the first coil set is the same as the pitch of the out-of-slot turn of the third large U-shaped conductor of the third U-shaped conductor set of the third coil set; the pitch of the out-of-slot turn of the second U-shaped conductor of the second coil assembly is the same as the pitch of the out-of-slot turn of the fourth U-shaped conductor of the fourth coil assembly. The technical scheme of the motor stator adopts a stator winding structure and adopts a completely symmetrical structure on a magnetic circuit, so that the problem of circulating current generated by an asymmetrical structure is solved; the inter-phase busbars are omitted, direct connection between the phases is achieved, 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 reduced, the production cost is reduced, the material cost is reduced, and the processing efficiency is improved. Therefore, the technical scheme of the application effectively solves the problems that the hairpin coils used in the related technology are more in variety, complex in arrangement mode, complex in manufacturing process, high in production cost and low in processing efficiency, and a large number of bus bars and bus bars are needed to be used for connecting branches and neutral points of windings of all phases.

Drawings

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

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

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

fig. 3 is a schematic structural diagram of a first large U-shaped conductor 210A according to an embodiment of the present invention;

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

fig. 5 is a schematic structural diagram of a second U-shaped conductor 220 according to an embodiment of the invention;

fig. 6 is a schematic structural diagram of a third large U-shaped conductor 230A according to a first embodiment of the present invention;

fig. 7 is a schematic structural diagram of a third small U-shaped conductor 230B according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a fourth U-shaped conductor 240 according to an embodiment of the invention;

fig. 9 is a schematic plan view of a phase stator winding according to a third embodiment of the present invention;

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

fig. 11 is a schematic structural diagram of a third large U-shaped conductor 230A according to the second embodiment of the present invention;

fig. 12 is a schematic structural diagram of a third small U-shaped conductor 230B according to the second embodiment of the present invention;

fig. 13 is a schematic plan view of a stator winding of one phase according to the fourth embodiment of the present invention;

FIG. 14 is a schematic diagram of an electrical connection in an embodiment of the present invention;

FIG. 15 is another electrical connection schematic in an embodiment of the present invention;

Detailed Description

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

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

The invention provides a motor stator. In fig. 1, 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, 0102, 0103, 0104 are three directions extending along the radial direction of the stator core, the slot pitch is the interval between two slot inner portions 301 of the conductor along the circumferential direction in the present application, and the pitch is the interval between two slot inner portions 301 of the conductor along the circumferential direction.

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

as shown in fig. 1, 9, and 13, the stator winding 10 includes a plurality of phase windings mounted on the stator core 20 so as to be different from each other in electrical phase, wherein at least two branch windings of each phase winding are connected in parallel in sequence in the circumferential direction of the stator core.

With reference to fig. 1, 9, and 13, in the present embodiment, the stator winding 10 is mounted on the stator core 20, that is, a plurality of phase windings mounted on the stator core 20 so as to be different from each other in electrical phase, wherein the stator winding 10 is a three-phase (i.e., U-phase, V-phase, W-phase) winding, and each phase slot of each pole is 2 or more; two slots 21 are provided for each magnetic pole of the rotor, the number of slots per pole per phase is 2 in the present embodiment, the rotor has twelve magnetic poles and is such that the number of slots 21 provided in the stator core 20 is equal to 72 (i.e., 2X12X3) for each phase of the three-phase stator winding 10, as shown in fig. 9, the U1 and U2 windings in the U-phase winding are sequentially connected in parallel in the circumferential direction of the stator core, the V1 and V2 windings in the V-phase winding are sequentially connected in parallel in the circumferential direction of the stator core, and the W1 and W2 windings in the W-phase are sequentially connected in parallel in the circumferential direction of the stator core, respectively; 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, with the stator core 20 being defined by the adjacent two slots 21 by one tooth 22, it should be noted that other conventional metal plates may be used instead of the magnetic steel plates.

Illustratively, as shown in fig. 1 and 2, the stator winding 10 includes: a first coil group 110, at least one second coil group 120, at least one third coil group 130, and a fourth coil group 140 sequentially sleeved along a radial direction of the stator core 20;

referring to fig. 2, in the present embodiment, the first coil group 110 is located at the inner side of the stator core in the radial direction, i.e. close to the inner surface of the stator core in the radial direction, in the present embodiment, the first coil group 110 is located at the inner side of the stator core in the radial direction, one second coil group 120 is located at the intermediate layer of the stator core close to the inner layer in the radial direction (in this application, the second coil group 120 may be multiple), one third coil group 130 is located at the intermediate layer of the stator core far from the inner layer in the radial direction, and the fourth coil group 140 is located at the outer side of the stator core in the; correspondingly, each coil group in the stator winding 10 may also be sequentially sleeved with the first coil group 110 along the radial outer side of the stator core 20, i.e. away from the radial inner surface direction of the stator core, at least one second coil group 120, at least one third coil group 130, and the fourth coil group 140 located on the radial inner side of the stator core, i.e. close to the radial inner surface direction of the stator core; correspondingly, as shown in fig. 9 and 13, the fixed winding may also be sequentially sleeved with the first coil group, the at least one third coil group, the at least one second coil group, and the fourth coil group along the radial direction of the stator core, that is, the position relationship between the third coil group 130 and the second coil group 120 may be arbitrarily set between the first coil group 110 and the fourth coil group 140, in the first embodiment and the second embodiment, the second coil group 120 may be located at the radial second layer and the third layer of the stator core, the third coil group 130 is located at the radial fourth layer and the fifth layer of the stator core, or the third coil group 130 may be located at the radial second layer and the third layer of the stator core, and the second coil group 120 is located at the radial fourth layer and the fifth layer of the stator core.

Illustratively, as shown in fig. 1, 2, 3, and 4, the first coil group 110 has 18 first U-shaped conductor groups 210, and the first U-shaped conductor groups 210 include: a first large U-shaped conductor 210A, a first small U-shaped conductor 210B, the first large U-shaped conductor 210A comprising: the stator core comprises an outer slot end 303, an inner slot part 301, an outer slot turning part 302, an inner slot part 301, an outer slot end 303 and two inner slot parts 301 which are sequentially connected, wherein the two inner slot parts 301 are positioned in two slots 21 which are arranged on the same radial layer of the stator core 20 (the first radial layer of the stator core is close to the rotor direction in the embodiment) and have a specified slot distance; an out-of-slot turn 302, the out-of-slot turn 302 being located axially outside the slot at the other end 25 of the stator core 20 and connecting the two in-slot portions 301; the two outer slot ends 303, the outer slot ends located in the same radial layer of the stator core extend along the circumferential direction of the stator core with the same slot pitch and the same extension direction, the two outer slot ends 303 are located at one axial end 26 of the stator core 20 and are connected with the two inner slot portions 301 in the same layer, namely, located in the same radial layer of the stator core slot (in this embodiment, the first radial layer of the stator core in the rotor direction), and the two outer slot ends 303 are located in the circumferential direction of the stator core 20 and extend with the same slot pitch and the same extension direction;

illustratively, as shown in fig. 4, the first small U-shaped conductor 210B includes: the stator core comprises an outer slot end 303, an inner slot part 301, an outer slot turning part 302, an inner slot part 301, an outer slot end 303 and two inner slot parts 301 which are sequentially connected, wherein the two inner slot parts 301 are positioned in two slots 21 which are arranged on the same radial layer of the stator core 20 (the first radial layer of the stator core is close to the rotor direction in the embodiment) and have a specified slot distance; an out-of-slot turn 302, the out-of-slot turn 302 being located axially out of the slot at the other end 25 of the stator core to connect the two in-slot portions 301; the two outer slot ends 303, the outer slot ends located in the same radial layer of the stator core extend along the circumferential direction of the stator core with the same slot pitch and the same extension direction, the two outer slot ends 303 are located at one axial end 26 of the stator core 20 and are connected with the two inner slot portions 301 in the same layer, namely, located in the same radial layer of the stator core slot (in this embodiment, the first radial layer of the stator core in the rotor direction), and the two outer slot ends 303 are located in the circumferential direction of the stator core 20 and extend with the same slot pitch and the same extension direction; two outer slot ends 303 of the first large U-shaped conductor 210A of the 18 first U-shaped conductor groups 210 of the first coil group 110 are located at the outer periphery of the first layer of slots in the radial direction of the stator core and extend for Y/2 slot pitches, as shown in fig. 2, two outer slot ends 303 of the first small U-shaped conductor 210B of the 18 first U-shaped conductor groups 210 of the first coil group 110 are located at the outer periphery of the first layer of slots in the radial direction of the stator core and extend for Y/2 slot pitches (Y is 6 in this embodiment); the plurality of slot outer ends 303 of the first coil group 110 extend counterclockwise in the circumferential direction of the stator core.

Exemplarily, as shown in fig. 2, the first large U-shaped conductor 210A and the first small U-shaped conductor 210B of the first U-shaped conductor group 210 are located in circumferentially adjacent slots of the stator core, that is, the two slot interiors 301 of the first large U-shaped conductor 210A are located in the first slot and the eighth slot of the stator core, the two slot interiors 301 of the first small U-shaped conductor 210B of the first U-shaped conductor group 210 are located in the second slot and the seventh slot of the stator core, the slot interior 301 of the first large U-shaped conductor surrounds the slot interior 301 of the first small U-shaped conductor, the out-slot turn 302 of the first large U-shaped conductor 210A connects the respective two slot interiors 301, the out-slot turn 302 of the first small U-shaped conductor 210B connects the respective two slot interiors 301, that is, the out-slot turn 302 of the first large U-shaped conductor 210A surrounds the out-slot turn 302 of the first small U-shaped conductor 210B;

referring to fig. 2, in this embodiment, 18 first U-shaped conductor groups 210 of the first coil group 110 are sequentially arranged along the circumferential direction of the stator core, the first U-shaped conductor group 210 of the first coil group 110 is located at the first layer of the first slot, the second slot, the seventh slot, and the eighth slot of the stator core, the second first U-shaped conductor group 210 of the first coil group 110 is located at the first layer of the third slot, the fourth slot, the forty-fifth slot, and the forty-sixth slot of the stator core, the third first U-shaped conductor group 210 of the first coil group 110 is located at the first layer of the fifth slot, the sixth slot, the eleventh slot, and the twelfth slot of the stator core, the fourth first U-shaped conductor group 210 of the first coil group 110 is located at the first layer of the thirteenth slot, the fourteenth slot, the nineteenth slot, and the twentieth slot of the stator core, by analogy, the plurality of slot interiors 301 of the 18 first U-shaped conductor groups 210 are located in sequence in the first tier of 72 slots of the stator core along the circumferential direction of the stator core 20.

Illustratively, as shown in fig. 1, 2, and 4, the second coil group 120 has 72 second U-shaped conductors 220, and the second U-shaped conductors 220 include: the two slot interiors 301 of the second U-shaped conductor 220 are positioned in two slots 21 with a specified slot pitch of two layers (the second layer and the third layer of the stator core in the radial direction close to the rotor direction in the embodiment) of the stator core 20 which are adjacent in the radial direction, the turning part 302 outside the slot 302 is positioned at the other end 25 of the stator core 20 in the axial direction outside the slot and is connected with the two slot interiors 301; the two outer slot ends 303 are positioned at the outer slot ends of the same radial layer of the stator core and extend along the circumferential direction of the stator core for the same slot pitch and in the same extending direction, the two outer slot ends 303 are positioned at one axial end 26 of the stator core 20 and are connected with the two inner slot portions 301 in the same layer, namely positioned in two radially adjacent layers of slots of the stator core (in the embodiment, the second layer and the third layer of the stator core in the radial direction of the rotor), and the two outer slot ends 303 are positioned at the circumferential direction of the stator core 20 and extend for the same slot pitch and in; two outer slot ends 303 of the 72 second U-shaped conductors 220 of the second coil group 120 are located on the outer slot peripheries of the second layer and the third layer in the radial direction of the stator core and extend by Y/2 slot pitches (Y/2 is 3 in this embodiment), as shown in fig. 2, the plurality of outer slot ends 303 of the second coil group 120 located on the second layer of the stator core extend along the counterclockwise direction of the circumferential direction of the stator core, and the plurality of outer slot ends 303 of the second coil group 120 located on the third layer of the stator core extend along the clockwise direction of the circumferential direction of the stator core.

With reference to fig. 2, in this embodiment, the first second U-shaped conductor 220 of the second coil group 120 is located in the first slot of the second layer of the stator core, the forty-third slot of the third layer of the stator core, the second U-shaped conductor 220 of the second coil group 120 is located in the second slot of the second layer of the stator core, the forty-fourth slot of the third layer of the stator core, the third second U-shaped conductor 220 of the second coil group 120 is located in the third slot of the second layer of the stator core, the forty-fifth slot of the third layer of the stator core, the fourth second U-shaped conductor 220 of the second coil group 120 is located in the fourth slot of the second layer of the stator core, and the forty-sixth slot of the third layer of the stator core, so that the 72 second U-shaped conductors 220 are sequentially located in the second layer and the third layer of the 72 slots of the stator core along the circumferential direction of the stator core.

Illustratively, as shown in fig. 2, 6, and 7, the third coil group 130 has 36 third U-shaped conductor groups 230, and the third U-shaped conductor groups 230 include: a third large U-shaped conductor 230A, a third small U-shaped conductor 230B; the third large U-shaped conductor 230A includes: the stator core comprises an outer slot end 303, an inner slot part 301, an outer slot turning part 302, an inner slot part 301, an outer slot end 303 and two inner slot parts 301 which are sequentially connected, wherein the two inner slot parts 301 are positioned in two adjacent layers (a fourth layer and a fifth layer in the radial direction of the stator core close to the rotor direction in the embodiment) in the radial direction of the stator core 20 and are separated by two slots 21 with a specified slot pitch; an out-of-slot turn 302, the out-of-slot turn 302 being located at one axial end 25 of the stator core 20 connecting the two in-slot portions; two outer tip of slot 303, the outer tip of slot 303 that is located stator core 20 radial same layer extends same slot distance and extending direction the same along stator core circumference, two outer tip of slot 303 are located stator core axial other end 26 and connect two inslot portions 301 with the layer respectively, the outer tip of slot 303 that is located stator core 20 fourth layer is with the inslot portion 301 of layer connection fourth layer promptly, the outer tip of slot 303 that is located stator core 20 fifth layer is with the inslot portion 301 of layer connection fifth layer, the outer tip of slot 303 that is located stator core 20 radial adjacent two-layer is opposite and keeps away from along stator core circumference extending direction, the extending direction that is located the outer tip of slot on stator core radial fourth layer extends along the clockwise, the extending direction that is located the outer tip of slot on stator core radial fifth layer extends along the counter-clockwise.

Illustratively, as shown in fig. 2, 6, and 7, the third small U-shaped conductor 230B includes: the stator core comprises an outer slot end 303, an inner slot part 301, an outer slot turning part 302, an inner slot part 301, an outer slot end 303 and two inner slot parts 301 which are sequentially connected, wherein the two inner slot parts 301 are positioned in two adjacent layers (a fourth layer and a fifth layer in the radial direction of the stator core close to the rotor direction in the embodiment) in the radial direction of the stator core 20 and are separated by two slots 21 with a specified slot pitch; an out-of-slot turn 302, the out-of-slot turn 302 being located at one axial end 25 of the stator core 20 to connect the two in-slot portions 301; the two outer slot ends 303 are positioned at the outer slot ends 303 of the same radial layer of the stator core 20, extend for the same slot distance along the circumferential direction of the stator core and have the same extending direction, the two outer slot ends 303 are positioned at the other axial end 26 of the stator core and are respectively connected with the two inner slot ends 301 in the same layer, namely the outer slot ends of the fourth layer of the stator core 20 are connected with the inner slot 301 of the fourth layer in the same layer, the outer slot ends 303 of the fifth layer of the stator core 20 are connected with the inner slot 301 of the fifth layer in the same layer, the outer slot ends 303 of the two radially adjacent layers of the stator core 20 are opposite in the circumferential extending direction of the stator core, namely, the extending direction of the outer slot ends of the fourth layer of the radial direction of the stator core extends along the clockwise direction; as shown in fig. 6, the outer ends 303 of the third large U-shaped conductors 230A of the 36 third U-shaped conductor groups 230 of the third coil group 130 located at the fourth layer in the radial direction of the stator core are located at Y/2 slot pitches extending in the outer circumference of the stator core slot, as shown in fig. 7, the outer ends 303 of the third small U-shaped conductors 230B of the 24 third U-shaped conductor groups 230 of the third coil group 130 located at the fourth layer in the radial direction of the stator core are located at Y/2 slot pitches extending in the outer circumference of the stator core slot, as shown in fig. 6, the outer ends 303 of the third large U-shaped conductors 230A of the 24 third U-shaped conductor groups 230 of the third coil group 130 located at the fifth layer in the radial direction of the stator core are located at Y/2 slot pitches extending in the outer circumference of the stator core slot, as shown in fig. 7, and the outer ends 303 of the third small U-shaped conductors 230B of the 24 third U-shaped conductor groups 230 of the third coil group 130 located at the fifth layer in the radial direction of the stator core are located at Y/2 slot pitches extending in the outer circumference of the stator core slot Y is 6 in the embodiment), that is, the slot pitches of the plurality of outer slot ends 303 of the 36 third U-shaped conductor groups 230 located in the same layer of the third coil group 130 of the stator core 20 extending along the circumferential direction of the stator core 20 are the same.

Exemplarily, as shown in fig. 2, 6 and 7, the third large U-shaped conductor 230A and the third small U-shaped conductor 230B of the third U-shaped conductor group 230 are located in circumferentially adjacent slots of the stator core, i.e. the two slot interiors 301 of the third large U-shaped conductor 230A are located in the first slot and the forty-first slot of the stator core, the two slot interiors 301 of the third small U-shaped conductor 230B are located in the forty-eight slot and the forty-second slot of the stator core, the slot interior 301 of the third large U-shaped conductor surrounds the slot interior 301 of the third small U-shaped conductor, the out-slot turn 302 of the third large U-shaped conductor 230A connects the respective two slot interiors 301, and the out-slot turn 302 of the third small U-shaped conductor 230B connects the respective two slot interiors 301, i.e. the out-slot turn 302 of the third large U-shaped conductor 230A surrounds the out-slot turn 302 of the third small U-shaped conductor 230B;

with reference to fig. 2, the 36 third U-shaped conductor groups 230 of the third coil group 130 are sequentially arranged along the circumference of the stator core, the first third U-shaped conductor group 230 of the third coil group 130 is located at the fourth layer of the first slot, the fourth layer of the second slot, the fifth layer of the fourteenth slot, and the fifth layer of the forty-fifth slot of the stator core, the second third U-shaped conductor group 230 of the third coil group 130 is located at the fourth layer of the third slot, the fourth layer of the fourth slot, the fifth layer of the forty-fifteenth slot, and the fifth layer of the forty-sixth slot of the stator core, the third U-shaped conductor group 230 of the third coil group 130 is located at the fourth layer of the fifth slot, the fourth layer of the sixth slot, the fifth layer of the forty-seventeenth slot, and the fifth layer of the forty-eighth slot of the stator core, the fourth U-third U-shaped conductor group 230 of the third coil group 130 is located at the fourth layer of the seventh slot, the eighth slot, the fourth layer of the eighth slot, the fifth layer of the first slot, the fifth slot, the second slot, the plurality of slot interiors 301 of the 36 third U-shaped conductor groups 230 are sequentially located in the fourth layer and the fifth layer of the 72 slots of the stator core along the circumferential direction of the stator core 20.

Illustratively, as shown in fig. 1, 2, and 8, the fourth coil group 140 has 36 fourth U-shaped conductors 240, and the fourth U-shaped conductors 240 include: the stator core comprises an outer slot end 303, an inner slot part 301, an outer slot turning part 302, an inner slot part 301 and an outer slot end 303 which are connected in sequence, wherein the two inner slot parts 301 are positioned in two slots 21 which are arranged on the same radial layer of the stator core 20 (the sixth radial layer of the stator core close to the rotor direction in the embodiment) and are separated by a specified slot pitch; an out-of-slot turn 302, the out-of-slot turn 302 being located axially outside the slot at the other end 25 of the stator core 20 and connecting the two in-slot portions 301; the two outer slot ends 303, the outer slot ends located in the same radial layer of the stator core extend along the circumferential direction of the stator core with the same slot pitch and the same extension direction, the two outer slot ends 303 are located at one axial end 26 of the stator core 20 and are connected with the two inner slot portions 301 on the same layer, namely, are located in the same radial layer of the stator core slot (the sixth radial layer of the stator core in the direction close to the rotor in the embodiment), and the two outer slot ends 303 are located in the circumferential direction of the stator core 20 and extend with the same slot pitch and the same extension direction; as shown in fig. 8, the two outer slot ends 303 of the 36 fourth U-shaped conductors 240 of the fourth coil group 140 are located at the outer circumference of the stator core slot extending Y/2 slot pitch; the plurality of slot outer ends 303 of the fourth coil group 140 extend in the clockwise direction in the stator core circumferential direction.

Referring to fig. 2, in this embodiment, the 36 fourth U-shaped conductors 240 of the fourth coil group 140 are sequentially arranged along the circumferential direction of the stator core, the first fourth U-shaped conductor 240 of the fourth coil group 140 is located at the sixth layer and the sixth layer of the seventh slot of the first slot of the stator core, the second fourth U-shaped conductor 240 of the fourth coil group 140 is located at the sixth layer and the sixth layer of the forty-fourth slot of the stator core, the third fourth U-shaped conductor 240 of the fourth coil group 140 is located at the sixth layer and the sixth layer of the forty-fifth slot of the stator core, the fourth U-shaped conductor 240 of the fourth coil group 140 is located at the sixth layer and the sixth layer of the fourth slot of the stator core, the fifth fourth U-shaped conductor 240 of the fourth coil group 140 is located at the sixth layer and the eleventh layer of the fifth slot of the stator core, the sixth U-shaped conductor 240 of the fourth coil group 140 is located at the sixth layer and the sixth layer of the stator core, The forty-eighth slot sixth layer, and so on, the plurality of slot interiors 301 of the 36 fourth U-shaped conductors 240 are located sequentially within the sixth layer of 72 slots of the stator core along the circumferential direction of the stator core 20.

Illustratively, as shown in fig. 1 to 9, the pitch of the out-of-slot turn of the first large U-shaped conductor 210A of the first U-shaped conductor group 210 of the first coil group 110 is the same as the pitch of the out-of-slot turn of the third large U-shaped conductor 230A of the third U-shaped conductor group 230 of the third coil group 130; the pitch of the out-of-slot turn of the second U-shaped conductor 220 of the second coil assembly 120 is the same as the pitch of the out-of-slot turn of the fourth U-shaped conductor 240 of the fourth coil assembly 140.

With reference to fig. 1 to 9, in the embodiment, the pitch of the two inside slots corresponding to the outside-slot bent portion of the first large U-shaped conductor 210A of the first U-shaped conductor group 210 of the first coil group 110 is Z (Z is a long pitch in the present embodiment), and the pitch of the two inside slots corresponding to the outside-slot bent portion 302 of the third large U-shaped conductor 230A of the third U-shaped conductor group 230 of the third coil group 130 is Z (Z is a long pitch in the present embodiment), that is, the pitch of the outside-slot bent portion of the first large U-shaped conductor 210A of the first U-shaped conductor group 210 of the first coil group 110 is the same as the pitch of the outside-slot bent portion of the third large U-shaped conductor 230A of the third U-shaped conductor group 230 of the third coil group 130; the pitch of the two slot inner portions 301 corresponding to the out-of-slot bent portions 302 of the second U-shaped conductor 220 of the second coil group 120 is Y (Y is a full pitch in this embodiment), and the pitch of the two slot inner portions 301 corresponding to the out-of-slot bent portions 302 of the fourth U-shaped conductor 240 of the fourth coil group 140 is Y. (Y is the full pitch in this embodiment), the pitch of the out-of-slot turn of the second U-shaped conductor 220 of the second coil set 120 is the same as the pitch of the out-of-slot turn of the fourth U-shaped conductor 240. The winding structure adopts a completely symmetrical structure on a magnetic circuit, so that the problem of circulating current generated by an asymmetrical structure is solved; the inter-phase busbars are omitted, direct connection between the phases is achieved, 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 reduced, the production cost is reduced, the material cost is reduced, and the processing efficiency is improved.

Exemplarily, as shown in fig. 2, fig. 3, fig. 4, fig. 7, and fig. 8, in the present embodiment, the slot interiors 301 of the 18 first U-shaped conductor groups 210 of the first coil group 110 are located in the same radial layer of the stator core 20, i.e., a radially inner first layer, and the slot interiors 301 of the 36 fourth U-shaped conductors 240 of the fourth coil group 140 are located in the same radial layer of the stator core 20, i.e., a radially inner sixth layer;

illustratively, as shown in FIGS. 3 and 4, as shown in fig. 6 and 7, in the embodiment, the pitch of the outside-slot turn 302 of the first large U-shaped conductor 210A of the first U-shaped conductor group 210 of the first coil group 110 is a long pitch (Z is a long pitch 7 and Z is greater than a full pitch 6 in the present embodiment), the pitch of the outside-slot turn 302 of the first small U-shaped conductor 210B of the first U-shaped conductor group 210 of the first coil group 110 is a short pitch (X is a short pitch 5 and X is less than a full pitch 6 in the present embodiment), the pitch of the outside-slot turn 302 of the third large U-shaped conductor 230A of the third U-shaped conductor group 230 of the third coil group 130 is a long pitch (Z is a long pitch 7 and Z is greater than a full pitch 6 in the present embodiment), and the pitch of the outside-slot turn 302 of the third small U-shaped conductor 230B of the third U-shaped conductor group 230 of the third coil group 130 is a short pitch (Y is a full pitch 5 in the present embodiment).

Alternatively, as shown in fig. 5 and 8, in an implementation, the pitch of the out-of-slot turn 302 of the second U-shaped conductor 220 of the second coil group 120 is a full pitch (Y is a full pitch of 6 in this embodiment), and the pitch of the out-of-slot turn 302 of the fourth U-shaped conductor 240 of the fourth coil group 140 is a full pitch (Y is a full pitch of 6 in this embodiment).

With reference to fig. 5, 6, and 7, in the first embodiment, the two outer slot ends 303 of the second U-shaped conductor 220 of the second coil group 120 are respectively bent and extended outwards along the circumferential direction of the stator core relative to the two inner slot portions 301, that is, the two outer slot ends 303 of the second U-shaped conductor 220 extend in opposite directions and away from each other along the circumferential direction of the stator core; two outer slot ends 303 of a third large U-shaped conductor 230A of a third U-shaped conductor group 230 of the third coil group 130 are respectively bent outwards and extend along the circumferential direction of the stator core relative to the two slot interiors 301, that is, the two outer slot ends 303 of the third large U-shaped conductor 230A are opposite in extending direction along the circumferential direction of the stator core and are away from each other, and two outer slot ends 303 of a third small U-shaped conductor 230B of the third U-shaped conductor group 230 of the third coil group are respectively bent outwards and extend along the circumferential direction of the stator core relative to the two slot interiors 301, that is, the two outer slot ends 303 of the third small U-shaped conductor 230B are opposite in extending direction along the circumferential direction of the stator core and are away from each other.

With reference to fig. 10, 11, and 12, in the second embodiment, the two outer slot ends 303 of the second U-shaped conductor 220 of the second coil group 120 are respectively bent inward and extend along the circumferential direction of the stator core relative to the two inner slot portions 301, that is, the two outer slot ends 303 of the second U-shaped conductor 220 extend in opposite directions and close to each other along the circumferential direction of the stator core; the two outer slot ends 303 of the third large U-shaped conductor 230A of the third U-shaped conductor group 230 of the third coil group 130 are respectively bent inward and extend along the circumferential direction of the stator core relative to the two slot interiors 301, that is, the two outer slot ends 303 of the third large U-shaped conductor 230A are opposite and close to each other in the extending direction along the circumferential direction of the stator core, and the two outer slot ends 303 of the third small U-shaped conductor 230B of the third U-shaped conductor group 230 of the third coil group 130 are respectively bent inward and extend along the circumferential direction of the stator core relative to the two slot interiors 301, that is, the two outer slot ends 303 of the third small U-shaped conductor 230B are opposite and close to each other in the extending direction along the circumferential direction of the stator core.

Illustratively, as shown in fig. 9 and 13, the out-of-slot ends 303 of the stator winding 10 have extension ends 4, except for the extension ends 4 connected to the lead wires, the out-of-slot end extension ends 4 of N-1 layers adjacent to each other in the same radial direction of the stator core 20 are connected to the out-of-slot end extension ends 4 of the N layers, and the pitch of the two connected out-of-slot ends 303 extending in the outer circumferential direction of the stator core slot 21 is a full pitch, and N is an even number.

Referring to fig. 9 and 13, in any phase 3 of the stator winding 10, the U1 winding branches and the U2 winding branches of the U-phase winding are sequentially connected in parallel along the circumferential direction of the stator core 20, respectively, the outer slot end 303 of the stator winding 10 has an extending end 4, except the extending end 4 connected to the outgoing line (where the outgoing line includes a lead end and a neutral point, and the lead end is connected to the neutral point), U-shaped conductors corresponding to the U1 and the U2 branches of the U-phase winding of the stator winding are located at the outer slot end 303 extending end 4 of the first layer adjacent to the stator core 20 in the same radial direction and connected to the outer slot end 303 extending end 4 of the second layer of the slot, the two connected outer slot ends 303 are located at a pitch of 6 in the outer circumferential direction of the stator core slot 21 (that is, that the pitch between the first slot inner portion located at the outer slot end 303 of the first layer of the stator core in the same radial direction and the second slot inner portion located at the outer slot end 303 of the second layer of the stator, y is 6 in this embodiment), the extended end 4 of the outer end 303 of the slot located in the third layer of the stator core 20 and the extended end 4 of the outer end 303 of the slot located in the same radially adjacent third layer are connected to each other, the pitch of the two connected outer ends 303 of the slot located in the outer circumferential direction of the stator core slot 21 is 6 (i.e., the pitch between the first slot located in the first outer end 303 of the first slot in the third layer of the stator core and the second slot located in the other outer end 303 of the second slot in the fourth layer of the stator core in the same radial direction is the whole pitch Y, Y is 6 in this embodiment), the extended end 4 of the outer end 303 of the slot located in the fifth layer of the stator core 20 and the extended end 4 of the outer end 303 of the slot in the sixth layer are connected to each other, and the two connected outer ends 303 of the slot located in the outer circumferential direction of the stator core slot 21 are located in the same radially adjacent first slot in the first outer end 303 of the first slot in the fifth layer of the stator The pitch between the inner parts of the second slots of the two outer end parts 303 of the two slots is a whole pitch Y, and Y is 6 in the embodiment), namely the pitch of the outer end parts of the two connected (welded) slots of the stator winding positioned at the outer 26 end of the stator core, which extends in the circumferential direction, is 6, the outer end parts of the outgoing line and the welded slots are positioned at one axial end 26 of the stator core in the embodiment, the pitch of the outer end parts of the two connected slots of the stator winding positioned at the 26 end of the stator core, which extends in the circumferential direction, is 6, and the problem of circulating current generated by an asymmetric structure is solved by adopting a completely symmetric structure on a magnetic circuit through a winding; the inter-phase busbars are omitted, direct connection between the phases is achieved, 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 reduced, the production cost is reduced, the material cost is reduced, and the processing efficiency is improved.

Illustratively, as shown in fig. 14, U-phase conductor lead ends have U-phase terminals U1 and U2, V-phase conductor lead ends have V-phase terminals V1 and V2, W-phase conductor lead ends have W-phase terminals W1 and W2, U-phase conductor lead ends U3 and U4, V-phase conductor lead ends V3 and V4, and W-phase conductor lead ends W3 and W4 use connectors to perform neutral point connection, i.e., a star connection for connecting the 2-branch windings of the odd-numbered motor in parallel, as shown in fig. 15, U-phase conductor lead ends U1 and U2 connect W-phase conductor lead ends W3 and W4, W-phase conductor lead ends W1 and W2 connect V-phase conductor lead ends V3 and V4, V-phase conductor lead ends V1 and V2 connect U-phase conductor lead ends U3 and U4, i.e., a triangle connection for connecting the 2-branch windings of the odd-numbered motor in parallel.

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

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; they may be mechanically or electrically connected, directly or indirectly through intervening media, or may be interconnected between 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 illustrated 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 (10)

1. An electric machine stator comprising:

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

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

wherein, every two branch circuits winding edges in the phase winding stator core circumference is parallel connection in proper order, stator winding includes: the stator comprises a stator core, a first coil group, at least one second coil group, at least one third coil group and a fourth coil group which are sequentially sleeved along the radial direction of the stator core, or the first coil group, the at least one third coil group, the at least one second coil group and the fourth coil group which are sequentially sleeved along the radial direction of the stator core;

wherein the first coil group has a plurality of first U-shaped conductor groups, the first U-shaped conductor groups including: the stator core comprises a first large U-shaped conductor and a first small U-shaped conductor, wherein the first large U-shaped conductor and the first small U-shaped conductor are positioned in circumferentially adjacent slots of the stator core; the first large U-shaped conductor surrounds the first small U-shaped conductor;

the second coil assembly has a plurality of second U-shaped conductors;

the third coil set has a plurality of third U-shaped conductor sets, the third U-shaped conductor sets comprising: the third large U-shaped conductor and the third small U-shaped conductor are positioned in circumferentially adjacent slots of the stator core; the third large U-shaped conductor surrounds the third small U-shaped conductor;

the fourth coil group has a plurality of fourth U-shaped conductors;

each U-shaped conductor includes: inside the two grooves;

the outer slot bending part is positioned at one axial end of the stator core and is connected with the insides of the two slots;

the two outer end parts of the slots are positioned at the axial other ends of the stator core and are connected with the insides of the two slots on the same layer, and the outer end parts of the slots positioned on the same layer of the stator core in the radial direction extend for the same slot distance along the circumferential direction of the stator core and have the same extending direction; the outer end parts of the slots positioned on two layers of stator core radial direction adjacent to each other are opposite in the circumferential extension direction of the stator core;

the pitch of the out-of-slot turns of the first large U-shaped conductor of the first U-shaped conductor set of the first coil set is the same as the pitch of the out-of-slot turns of the third large U-shaped conductor of the third U-shaped conductor set of the third coil set; the pitch of the out-of-slot turn of the second U-shaped conductor of the second coil assembly is the same as the pitch of the out-of-slot turn of the fourth U-shaped conductor of the fourth coil assembly.

2. The electric machine stator of claim 1, wherein the plurality of slots of the first plurality of U-shaped conductor sets of the first coil set are located in a same radial layer of the stator core; the plurality of groove interiors of the plurality of fourth U-shaped conductors of the fourth coil group are located on the same radial layer of the stator core.

3. The stator according to claim 1, wherein the pitch of the outside-slot turn of the first large U-shaped conductor of the first U-shaped conductor group of the first coil group is a long pitch, and the pitch of the outside-slot turn of the first small U-shaped conductor of the first U-shaped conductor group of the first coil group is a short pitch; the pitch of the out-of-slot turn of the third large U-shaped conductor of the third U-shaped conductor set of the third coil set is a long pitch, and the pitch of the out-of-slot turn of the third small U-shaped conductor of the third U-shaped conductor set of the third coil set is a short pitch.

4. The stator according to claim 3, wherein the pitch of the outside-slot turn of the first large U-shaped conductor of the first U-shaped conductor group of the first coil group is 7, the pitch of the outside-slot turn of the first small U-shaped conductor of the first U-shaped conductor group of the first coil group is 5, the pitch of the outside-slot turn of the third large U-shaped conductor of the third U-shaped conductor group of the third coil group is 7, and the pitch of the outside-slot turn of the third small U-shaped conductor of the third U-shaped conductor group of the third coil group is 5.

5. The electric machine stator of claim 1, wherein the pitch of the out-of-slot turns of the second U-shaped conductor of the second coil group is a full pitch and the out-of-slot turns of the fourth U-shaped conductor of the fourth coil group is a full pitch.

6. The electric machine stator of claim 5, wherein the pitch of the out-of-slot turns of the second U-shaped conductor of the second coil group is 6 and the out-of-slot turns of the fourth U-shaped conductor of the fourth coil group is 6.

7. The electric machine stator according to any one of claims 1 to 6, wherein two slot outer ends of the second U-shaped conductor of the second coil group are located opposite and apart from a circumferential extension direction of the stator core; two out-of-slot ends of a third large U-shaped conductor of the third U-shaped conductor group of the third coil group are located in opposite circumferential extension directions of the stator core and are far away from the stator core, and two out-of-slot ends of a third small U-shaped conductor of the third U-shaped conductor group of the third coil group are located in opposite circumferential extension directions of the stator core and are far away from the stator core.

8. The electric machine stator according to any one of claims 1 to 6, wherein two slot outer ends of the second U-shaped conductor of the second coil group are located opposite and close to a circumferential extension direction of the stator core; two out-of-slot ends of a third large U-shaped conductor of the third U-shaped conductor group of the third coil group are located in opposite circumferential extension directions of the stator core and are close to the stator core, and two out-of-slot ends of a third small U-shaped conductor of the third U-shaped conductor group of the third coil group are located in opposite circumferential extension directions of the stator core and are close to the stator core.

9. The motor stator according to any one of claims 1 to 6, wherein the out-of-slot ends of the stator winding have extended ends, the out-of-slot end extended ends of the N-1 layers that are positioned in the same radial direction of the stator core are connected to the out-of-slot end extended ends of the N layers except for the extended ends connected to the lead wires, and the pitch of the two connected out-of-slot ends that extend in the circumferential direction of the stator core slots is a full pitch, and N is an even number.

10. An electric machine, comprising: a rotor and a stator of an electrical machine as claimed in any one of claims 1 to 9.

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