CN112260428A

CN112260428A - Motor stator and motor

Info

Publication number: CN112260428A
Application number: CN202011235594.6A
Authority: CN
Inventors: 房俊生
Original assignee: Tianjin Santroll Electric Automobile Technology Co Ltd
Current assignee: Tianjin Songzheng Auto Parts Co ltd
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2021-01-22

Abstract

The invention relates to the field of motors and discloses a motor stator and a motor.A stator winding comprises a plurality of phase windings which are arranged on a stator core so as to be different from each other in electric phase; each phase winding comprises a plurality of second conductor groups, a plurality of third conductor groups and 1 fourth conductor group which are sequentially connected in series, or each phase winding comprises a plurality of second conductor groups, a plurality of third conductor groups and 1 first conductor group which are sequentially connected in series, or each phase winding comprises 1 first conductor group, a plurality of second conductor groups, a plurality of third conductor groups and 1 fourth conductor group which are sequentially connected in series; the multiple conductor groups and the conductors are connected in series, the arrangement mode is simple, the twisting direction and the twisting groove distance of the welding end part extending in the groove in the same layer in the radial direction in the stator groove are consistent, the lead ends and neutral points among the windings of each phase are arranged in any layer of any groove in the same radial direction, the complexity of the manufacturing process is reduced, the production cost is reduced, and the processing efficiency is improved.

Description

Motor stator and motor

Technical Field

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

Background

In the prior art, a stator winding comprises various types of conductors, and the various types of conductors penetrate into slots of a stator core according to a certain arrangement mode to form the required winding of the multi-phase motor. At present, more than 90% of stator windings in the prior art have 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 directions of the welding ends or the distances among the twisting slots in the same layer of 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 invention provides a motor stator and a motor, which are characterized in that a plurality of conductor groups and conductors are connected in series, the arrangement mode is simple, the twisting direction and the twisting groove distance of welding end parts extending in the same layer of grooves in the radial direction in the stator groove are consistent, the lead ends and neutral points among windings of each phase are arranged in any layer of any groove in the same radial direction, the complexity of the manufacturing process is reduced, the production cost is reduced, and the processing efficiency is improved.

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

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

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

each phase winding comprises a plurality of second conductor groups, a plurality of third conductor groups and 1 fourth conductor group which are sequentially connected in series, or each phase winding comprises 1 first conductor group, a plurality of second conductor groups and a plurality of third conductor groups which are sequentially connected in series, or each phase winding comprises 1 first conductor group, a plurality of second conductor groups, a plurality of third conductor groups and 1 fourth conductor group which are sequentially connected in series;

dividing each slot into M layers distributed along the radial direction according to the number of the inner slots capable of being accommodated along the radial direction of the stator core, wherein M is an even number more than or equal to 4,

the first conductor group of each phase winding is positioned on the Mth radial layer of the stator core, and/or the fourth conductor group of the phase winding is positioned on the first radial layer of the stator core;

each conductor group comprises a plurality of conductors, the conductors of each conductor group comprise two slot interiors which are positioned in the stator core and separated by a specified slot distance, two welding ends which are respectively positioned in the two slot interiors and connected with the conductors at the axial second end of the stator core, and wire inserting ends which are positioned in the two slot interiors and connected with the conductors at the axial first end of the stator core;

each phase winding also comprises two eighth conductors, each eighth conductor comprises an inner part of a slot and two welding ends which are positioned at the two axial ends of the stator core and connected with the inner parts of the slots; the outgoing line of each phase winding is positioned at the first axial end of the stator core and connected with the welding end of the eighth conductor;

each phase winding also comprises a conductor in any conductor group, and the inside of the groove corresponding to the two welding ends of the two eighth conductors connected by the outgoing line and the inside of the two grooves of the conductor in any conductor group of the phase winding are positioned in two circumferentially adjacent grooves of the stator core.

Furthermore, the welding end connected by the outgoing line of each phase winding is located on two layers of the stator core which are adjacent in the radial direction, and the welding end connected by the outgoing line of the phase winding is located on the nth layer and the (N + 1) th layer of the stator core in the radial direction, or the welding end connected by the outgoing line of the phase winding is located on the (N + 1) th layer and the (N + 2) th layer of the stator core in the radial direction, wherein N is an odd number.

Furthermore, the welding end connected with the outgoing line of each phase winding is positioned on the same radial layer of the stator core, and the welding end connected with the outgoing line of the phase winding is positioned on the Mth radial layer or the first radial layer of the stator core.

Furthermore, the inside of a groove corresponding to the welding end connected with the outgoing line of each phase winding and the inside of two grooves of one conductor of one second conductor group are positioned in two circumferentially adjacent grooves of the stator core; or the inside of the groove corresponding to the welding end connected with the outgoing line of each phase winding and the inside of two grooves of one conductor of one third conductor group are positioned in two circumferentially adjacent grooves of the stator core.

Furthermore, the inside of a groove corresponding to the welding end connected with the outgoing line of each phase winding and the inside of two grooves of one conductor of one first conductor group are positioned in two circumferentially adjacent grooves of the stator core; or the inside of the groove corresponding to the welding end connected with the outgoing line of each phase winding and the inside of two grooves of one conductor of one fourth conductor group are positioned in two circumferentially adjacent grooves of the stator core.

Furthermore, the phase winding is located the stator core axial second end and has a plurality of first connection weld ends and a plurality of second connection weld ends that link together, and the weld end on the same radially adjacent M-1 th layer that is located the stator core axial second end is first connection weld end, and the weld end on the same radially adjacent M-th layer that is located the stator core axial second end is second connection weld end, and M is the even number.

Further, the first conductor group includes identical first conductors, and the pitch inside the two grooves of each first conductor is a full pitch; the fourth conductor group comprises a fourth large conductor and a fourth small conductor, the pitch between the two groove interiors of the fourth large conductor is a long pitch, and the pitch between the two groove interiors of the fourth small conductor is a short pitch.

Further, each conductor of the second conductor group is respectively positioned in the Nth layer and the (N + 1) th layer which are radially adjacent to the stator core;

each conductor of the third conductor group is respectively positioned in the (N + 1) th layer and the (N + 2) th layer which are radially adjacent to the stator core, wherein N is an odd number.

The invention also provides a motor which comprises the motor stator.

By applying the technical scheme of the invention, the motor stator comprises: a stator core having a plurality of slots formed on a radially inner surface thereof and spaced apart at predetermined slot pitches in a circumferential direction of the stator core; a stator winding including a plurality of phase windings mounted on the stator core so as to be different from each other in electrical phase; each phase winding comprises a plurality of second conductor groups, a plurality of third conductor groups and 1 fourth conductor group which are sequentially connected in series, or each phase winding comprises 1 first conductor group, a plurality of second conductor groups and a plurality of third conductor groups which are sequentially connected in series, or each phase winding comprises 1 first conductor group, a plurality of second conductor groups, a plurality of third conductor groups and 1 fourth conductor group which are sequentially connected in series; dividing each slot into M layers distributed along the radial direction according to the number of the slots which can be accommodated in the radial direction of the stator core, wherein M is an even number which is more than or equal to 4, and the first conductor group of each phase winding is positioned on the Mth layer of the radial direction of the stator core, and/or the fourth conductor group of the phase winding is positioned on the first layer of the radial direction of the stator core; each conductor group comprises a plurality of conductors, the conductors of each conductor group comprise two slot interiors which are positioned in the stator core and separated by a specified slot distance, two welding ends which are respectively positioned in the two slot interiors and connected with the conductors at the axial second end of the stator core, and wire inserting ends which are positioned in the two slot interiors and connected with the conductors at the axial first end of the stator core; each phase winding also comprises two eighth conductors, each eighth conductor comprises an inner part of a slot and two welding ends which are positioned at the two axial ends of the stator core and connected with the inner parts of the slots; the outgoing line of each phase winding is positioned at the first axial end of the stator core and connected with the welding end of the eighth conductor; each phase winding also comprises a conductor in any conductor group, and the inside of the groove corresponding to the two welding ends of the two eighth conductors connected by the outgoing line and the inside of the two grooves of the conductor in any conductor group of the phase winding are positioned in two circumferentially adjacent grooves of the stator core. The multiple conductor groups and the conductors are connected in series, the arrangement mode is simple, the twisting direction and the twisting groove distance of the welding end part extending in the groove in the same layer in the radial direction in the stator groove are consistent, the lead ends and neutral points among the windings of each phase are arranged in any layer of any groove in the same radial direction, the complexity of the manufacturing process is reduced, the production cost is reduced, and the processing efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

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 phase winding according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a fourth conductor set according to an embodiment of the invention;

fig. 4 is a schematic structural diagram of a conductor of the first conductor set according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a second conductor set or a third conductor set according to a fifth embodiment of the present invention;

fig. 6 is a schematic structural diagram of a second conductor set or a third conductor set according to a first embodiment of the present invention;

fig. 7 is a schematic plan view of a phase winding according to an embodiment of the present invention;

fig. 8 is a schematic plan view of a phase winding according to a second embodiment of the present invention;

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

fig. 10 is a schematic plan view of a phase winding according to a fourth embodiment of the present invention;

fig. 11 is a schematic diagram of three phase windings connected in a star configuration according to an embodiment of the present invention;

fig. 12 is a schematic diagram of three phase windings connected in a delta manner according to an embodiment of the present invention;

Detailed Description

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

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

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

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

as shown in fig. 1 to 2, and 7 to 12, the stator winding 10, which includes a plurality of phase windings mounted on the stator core 20 so as to be different from each other in electrical phase and form an even number of layers in the radial direction of the stator core 20, divides each slot into 4 layers distributed in the radial direction according to the number of the inside of the slot that each slot can accommodate in the radial direction of the stator core in the present embodiment (U-phase winding or V-phase winding or W-phase winding); the even number layers may be four, six, eight, or more even number layers. The motor stator in the embodiment is a motor stator in the hair pin motor.

With reference to fig. 1 to 12, in the first to fifth embodiments of the present invention, the stator winding 10 being mounted on the stator core 20, i.e., 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 winding, V-phase winding, W-phase winding) winding, and each pole is equal to or equal to 2 per phase slot; two slots 21 are provided for each pole of the rotor, 2 slots per phase per pole in the present embodiment, the rotor having eight poles and this is true for each phase of the three-phase stator winding 10, the number of slots 21 provided in the stator core 20 being equal to 48 (i.e., 2X8X 3); further, in the present embodiment, the stator core 20 is formed by stacking a plurality of annular magnetic steel plates to form the stator core axial direction both end faces 25, 26 of the stator core 20 by defining one tooth portion 22 by two adjacent slots 21, and other conventional metal plates may be used instead of the magnetic steel plates.

As shown in fig. 7, in the first embodiment, each phase winding (U-phase winding, V-phase winding, W-phase winding) is 1 first conductor group, 11 second conductor groups, 2 third conductor groups, and 1 fourth conductor group, which are sequentially connected in series; as shown in fig. 8, in the second embodiment, each phase winding (U-phase winding, V-phase winding, W-phase winding) is 12 second conductor groups, 2 third conductor groups, and 1 fourth conductor group, which are sequentially connected in series; as shown in fig. 9, in the third embodiment, each phase winding (U-phase winding, V-phase winding, W-phase winding) is 1 first conductor group, 12 second conductor groups, 1 third conductor group, 1 fourth conductor group, which are sequentially connected in series; as shown in fig. 10, in the fourth embodiment, each phase winding (U-phase winding, V-phase winding, W-phase winding) is 1 first conductor group, 12 second conductor groups, 2 third conductor groups connected in series in this order; in the present application, a plurality of the third conductor sets is an integer of 1 or more.

As shown in fig. 3, 4, and 7 to 10, in the first to fifth embodiments, the first conductor group of each phase winding is located at the fourth layer in the radial direction of the stator core, and the fourth conductor group of the phase winding is located at the first layer in the radial direction of the stator core;

with reference to fig. 3-10, in an embodiment, the first conductor set includes: two identical first conductors 150, each first conductor 150 comprising two slot interiors 301 located in the same radial layer of the stator core at a specified slot pitch, two weld ends 303 respectively located at the second axial end 25 of the stator core and connected with the two slot interiors 301 of the conductor, and a wire insertion end 302 located at the first axial end 26 of the stator core and connected with the two slot interiors 301 of the conductor; two welding ends 303 (both leftward) which are positioned outside the slots and have the same extending direction, wherein the two welding ends 303 are positioned at the axial outer 25 ends of the slots 21 and are respectively connected with the two slot interiors 301 of the conductor in the same layer, and the two slot interiors of the first conductor are positioned at the fourth layer of the radially innermost layer of the stator core;

in an embodiment, the fourth conductor set includes: each of the fourth large conductor 100A and the fourth small conductor 100B of the fourth conductor group includes two slot interiors 301 located in the same radial layer of the stator core and spaced by a specified slot pitch, two welding ends 303 respectively located at the second axial end 25 of the stator core and connected with the two slot interiors 301 of the conductors, and a wire insertion end 302 located at the first axial end 26 of the stator core and connected with the two slot interiors 301 of the conductors; two welding ends 303 (both right) located outside the slots and extending in the same direction, the two welding ends 303 located outside the axial direction 25 of the slot 21 are respectively connected to the two slot interiors 301 of the conductor in the same layer, and the two slot interiors of each conductor of the fourth conductor group are located in the first layer of the radially innermost layer of the stator core;

in one embodiment, the second conductor set includes: two identical second conductors 350, each second conductor 350 comprising two slot interiors 301 located in two radially adjacent layers of the stator core at a specified slot pitch, two welding ends 303 respectively located at the axial second end 25 of the stator core and connected with the two slot interiors 301 of the conductor, and a wire plugging end 302 located at the axial first end 26 of the stator core and connected with the two slot interiors 301 of the conductor; two welding ends 303 which are positioned outside the slot and extend in opposite directions (the extending directions of the two welding ends are opposite), wherein the two welding ends 303 are positioned at the axial outer 25 end of the slot 21 and are respectively connected with the two slot inner parts 301 of the conductor in the same layer; the two slot interiors of each conductor of the second conductor set are located on radially adjacent layers 1 and 2, and 3 and 4 of the stator core.

In embodiment five, the second conductor set comprises 300: each conductor in the fifth large conductor and the fifth small conductor of the second conductor group comprises two slot interiors 301 positioned in two adjacent layers of the stator core in the radial direction and separated by a specified slot distance, two welding ends 303 respectively positioned at the second axial end 25 of the stator core and connected with the two slot interiors 301 of the conductors, and a wire plugging end 302 positioned at the first axial end 26 of the stator core and connected with the two slot interiors 301 of the conductors; two welding ends 303 which are positioned outside the slot and extend in opposite directions (the extending directions of the two welding ends are opposite), wherein the two welding ends 303 are positioned at the axial outer 25 end of the slot 21 and are respectively connected with the two slot inner parts 301 of the conductor in the same layer; the two slot interiors of each conductor of the second conductor set are located on radially adjacent layers 1 and 2, and 3 and 4 of the stator core.

In an embodiment, the conductors of the third conductor set are of the same conductor structure as the conductors of the second conductor set, except that the two slot interiors of each conductor of the third conductor set are located in radially adjacent layers 2 and 3 of the stator core.

Each phase of winding also comprises two eighth conductors, each eighth conductor comprises an inner part of a slot, and two welding ends which are positioned at the first end 26 and the second end 25 of the stator core in the axial direction and are connected with the inner part of the slot, and the two welding ends positioned at the two ends of the stator core in the axial direction and the inner part of the slot are positioned at the same layer of the stator core in the radial direction; in the first to fourth embodiments, the inside of the slot corresponding to the welding end connected to the lead end of each phase winding (inside of the slot of the first eighth conductor) is located in the a-slot of the stator core (here, since the number of the corresponding slots in the conductor slots of different conductor groups in different embodiments may be any number, so that the a-slot replaces any one of the 48 slots) and one conductor of any conductor group (the inside of the slot of the a +1 slot or the slot of the a-1 slot of the stator core is located in two circumferentially adjacent slots of the stator core), and the inside of the slot corresponding to the welding end connected to the lead end of each phase winding (inside of the slot of the second eighth conductor) is located in the two circumferentially adjacent slots of the stator core The stator core is characterized in that a conductor of a B-th slot (in the present embodiment, since the number of corresponding slots in conductor slots of different conductor groups may be any number of slots, any slot in 48 slots is replaced by the B slot) and one conductor of any conductor group (a first conductor group, a second conductor group, a third conductor group or a fourth conductor group) is located in two circumferentially adjacent slots of the stator core within one slot of the B + 1-th slot or the B-1-th slot, that is, the two slots corresponding to two welding ends of two eighth conductors connected by leading-out wires and one conductor of one conductor group are located in two circumferentially adjacent slots of the stator core. The multiple conductor groups and the conductors are connected in series, the arrangement mode is simple, the twisting direction and the twisting groove distance of the welding end part extending in the groove in the same layer in the radial direction in the stator groove are consistent, the lead ends and neutral points among the windings of each phase are arranged in any layer of any groove in the same radial direction, the complexity of the manufacturing process is reduced, the production cost is reduced, and the processing efficiency is improved.

With reference to fig. 7, in the first embodiment, the welding end connected by the outgoing line of each phase winding is located at two radially adjacent layers of the stator core and located at the first circumferential end 26 of the stator core, the welding end connected by the outgoing line end U1 of each phase winding is located at the 4 th radial layer of the stator core, and the welding end connected by the outgoing line end U2 of the phase winding is located at the 3 rd radial layer of the stator core; that is, the welding end connected by the outgoing line of each phase winding is located at two layers adjacent to each other in the radial direction of the stator core and located at the first end 26 in the axial direction of the stator core, and the welding end connected by the outgoing line of each phase winding is located at the nth layer and the (N + 1) th layer in the radial direction of the stator core, where N is an odd number.

In the second embodiment, as shown in fig. 8, the welding end connected to the lead terminal U1 of each phase winding is located at the radial 4 th layer of the stator core, and the welding end connected to the lead terminal of the phase winding is located at the radial 4 th layer of the stator core; that is, the welding end connected with the outgoing line of each phase winding is located at the first axial end 26 of the stator core, the welding end connected with the outgoing line of the phase winding is located at the same radial layer of the stator core, that is, the welding end connected with the outgoing line of each phase winding is located at the mth radial layer of the stator core.

With reference to fig. 9, in the third embodiment, the welding end connected to the lead end U1 of each phase winding is located at the radial 3 rd layer of the stator core, and the welding end connected to the lead end U2 of the phase winding is located at the radial 2 nd layer of the stator core; that is, the welding end connected by the outgoing line of each phase winding is located at the first axial end 26 of the stator core, and the welding ends connected by the outgoing lines of the phase windings are located at the (N + 1) th layer and the (N + 2) th layer in the radial direction of the stator core.

With reference to fig. 10, in the fourth embodiment, the welding end connected to the lead terminal U1 of each phase winding is located at the radial 1 st layer of the stator core, and the welding end connected to the lead terminal of the phase winding is located at the radial 1 st layer of the stator core; that is, the welding end connected with the outgoing line of each phase winding is located at the first axial end 26 of the stator core, and the welding end connected with the outgoing line of the phase winding is located at the same radial layer of the stator core, that is, the welding end connected with the outgoing line of each phase winding is located at the first radial layer of the stator core.

With reference to fig. 1 to 10, in a first embodiment, each phase winding further includes one conductor of 1 second conductor group, one conductor of 1 second conductor group of each phase winding is the second conductor 350, in a fifth embodiment, one conductor of 1 second conductor group of each phase winding is the sixth small conductor, and of course, in a fifth embodiment, one conductor of 1 second conductor group of each phase winding may also be the sixth large conductor, and the inside of the slot corresponding to the weld end (inside of two slots of the eighth conductors) connected by the outgoing line of at least one branch winding of each phase winding and the inside of two slots of one conductor of one second conductor group are located in two circumferentially adjacent slots of the stator core; with reference to fig. 7, in the fourth embodiment, the slot interiors (two slot interiors of 2 eighth conductors) corresponding to the welding ends connected by the leading-out wires of the first branch winding of the phase winding are located in the 13 th slot of the 3 rd layer in the radial direction of the stator core, the 19 th slot of the fourth layer and one conductor of one second conductor group of the branch winding are located in the 14 th slot of the 3 rd layer in the radial direction of the stator core, and the two slot interiors of the 20 th slot of the fourth layer are located in two circumferentially adjacent slots of the stator core; with reference to fig. 9, in the third embodiment, each phase winding further includes one conductor of one third conductor set, and one conductor of 1 third conductor set of each phase winding is the third conductor 250, and in the fifth embodiment, one conductor of 1 third conductor set of each phase winding is the fifth small conductor, and certainly in the fifth embodiment, one conductor of 1 third conductor set of each phase winding is the fifth large conductor; the inside of a groove (the inside of two grooves of two eighth conductors) corresponding to the welding end connected with the outgoing line of at least one branch winding of each phase winding and the inside of two grooves of one conductor of one third conductor group are positioned in two circumferentially adjacent grooves of the stator core; with reference to fig. 8, in the second embodiment, the slot interiors corresponding to the welding ends (two slot interiors of 2 eighth conductors) connected by the lead-out wires of the second branch winding of the phase winding are located in the 13 th slot of the 3 rd layer in the radial direction of the stator core, the 19 th slot of the 2 nd layer and one conductor of one third conductor group of the branch winding are located in the 14 th slot of the 3 rd layer in the radial direction of the stator core and the two slot interiors of the 20 th slot of the 2 nd layer in the circumferential direction of the stator core. With reference to fig. 8, in the second embodiment, each phase winding includes one conductor of the first conductor group, one conductor of 1 first conductor group of each phase winding is the first conductor 150, and the inside of the slot (the inside of two slots of two eighth conductors) corresponding to the welding end connected by the outgoing line of at least one branch winding of each phase winding and the inside of two slots of one conductor of one first conductor group are located in two circumferentially adjacent slots of the stator core; referring to fig. 8, in the second embodiment, the slot interiors corresponding to the welding ends (two slot interiors of the 2 eighth conductors) connected by the lead-out wires of the second branch winding of the phase winding are located in the 26 th slot of the 4 th layer in the radial direction of the stator core, the 32 th slot of the 4 th layer and one conductor of one first conductor group of the branch winding are located in the 25 th slot of the 4 th layer in the radial direction of the stator core and the two slot interiors of the 31 st slot of the 4 th layer are located in two circumferentially adjacent slots of the stator core, referring to fig. 10, in the fourth embodiment, each phase winding includes one conductor of the fourth conductor group, one conductor of 1 fourth conductor group per phase winding is the fourth small conductor 100B, of course, the fourth large conductor 100A may also be used, and the inside of the slot (the inside of two slots of two eighth conductors) corresponding to the welding end connected to the outgoing line of at least one branch winding of each phase winding and the inside of two slots of one conductor of one fourth conductor group are located in two circumferentially adjacent slots of the stator core; with reference to fig. 9, in the third embodiment, the slot interiors corresponding to the welding ends (two slot interiors of 2 eighth conductors) connected by the lead-out wires of the second branch winding of the phase winding are located in the 19 th slot of the 1 st layer in the radial direction of the stator core, the 26 th slot of the 1 st layer and one conductor of one fourth conductor group of the branch winding are located in two slots adjacent to each other in the circumferential direction of the stator core, wherein the two slot interiors are located in the 20 th slot of the 1 st layer in the radial direction of the stator core and the 25 th slot of the 1 st layer.

Further, the first conductor group comprises two first conductors, two groove interiors of a first conductor 150 of the first conductor group are located in the grooves 7 and 13, two groove interiors of a second first conductor 150 of the first conductor group are located in the grooves 8 and 14, namely, a pitch between the two groove interiors of the two first conductors of the first conductor group is a whole pitch, and the two groove interiors of the two first conductors 150 of the first conductor group are respectively and sequentially located in two circumferentially adjacent grooves of the fourth layer of the stator core. The two inside grooves of the fourth large conductor 100A of the fourth conductor group are located in the grooves 13 and 20, the two inside grooves of the fourth small conductor 100B of the fourth conductor group are located in the grooves 14 and 19, that is, the pitch between the two inside grooves of the fourth large conductor of the fourth conductor group is the long pitch 7, the pitch between the two inside grooves of the fourth small conductor of the fourth conductor group is the short pitch 5, and the two inside grooves of the fourth large conductor 100A of the fourth conductor group surround the two inside grooves of the fourth small conductor 100B in the first layer in the stator core circumferential direction.

As shown in fig. 7, in the first embodiment, each phase winding (U-phase winding or V-phase winding or W-phase winding) includes 2 third conductor sets, that is, 2 identical third conductor sets are included, and when the even number layer is 6, the U-phase winding includes 4 third conductor sets; the phase winding (U-phase winding or V-phase winding or W-phase winding) is located at the axial second end of the stator core and is provided with a plurality of first connecting and welding ends and second connecting and welding ends which are connected together, the welding end located at the radial first layer of the stator core is the first connecting and welding end, the welding end located at the radial second layer of the stator core is the second connecting and welding end, the welding end located at the radial third layer of the stator core is the first connecting and welding end, the welding end located at the radial fourth layer of the stator core is the second connecting and welding end, and the sum of the span of the adjacent first connecting and welding ends located in the same radial direction of the stator core and the span of the second connecting and welding ends is the whole pitch 6; specifically, the pitch of the connection between the first connection welding end of one first conductor 150 or one second conductor 350 located in the same radial fourth layer of the stator core and the second connection welding end of one second conductor 350 or one third conductor 250 located in the same radial adjacent third layer of the stator core is the whole pitch 6, and the pitch of the connection between the first connection welding end of the other welding end of one second conductor 350 or one third conductor 250 located in the same radial second layer of the stator core and the second connection welding end of one second conductor 350 or one fourth large conductor 100A or one fourth small conductor 100B located in the same radial adjacent first layer of the stator core is the whole pitch 6; the two inside grooves of the first second conductor 350 of the second conductor group are respectively located in the 1 st groove and the 7 th groove of the stator core, the two inside grooves of the second conductor 350 of the second conductor group are respectively located in the 2 nd groove and the 8 th groove of the stator core, namely, the pitch between the two inside grooves of the second conductor group is the whole pitch 6; the two conductors of the third conductor set are identical third conductors 250, the two slot interiors of the first third conductor 250 of the third conductor set are located in the core slots 19, 25, and the two slot interiors of the second third conductor 250 of the third conductor set are located in the core slots 20, 26, i.e. the pitch between the two slot interiors of the third conductor 250 of the third conductor set is a full pitch.

Exemplarily, as shown in fig. 11, a star connection of the series windings of the motor, and as shown in fig. 12, a delta connection of the series windings of the motor.

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

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

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

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

Claims

1. An electric machine stator comprising:

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;

the method is characterized in that: each phase winding comprises a plurality of second conductor groups, a plurality of third conductor groups and 1 fourth conductor group which are sequentially connected in series, or each phase winding comprises 1 first conductor group, a plurality of second conductor groups and a plurality of third conductor groups which are sequentially connected in series, or each phase winding comprises 1 first conductor group, a plurality of second conductor groups, a plurality of third conductor groups and 1 fourth conductor group which are sequentially connected in series;

dividing each slot into M layers distributed along the radial direction according to the number of the slots capable of being accommodated in the radial direction of the stator core, wherein M is an even number more than or equal to 4,

the first conductor group of each phase winding is positioned on the radial Mth layer of the stator core, and/or the fourth conductor group of the phase winding is positioned on the radial first layer of the stator core;

each conductor group comprises a plurality of conductors, the conductors of each conductor group comprise two slot interiors which are positioned in the stator core and separated by a specified slot distance, two welding ends which are respectively positioned in the two slot interiors of the stator core and connected with the conductors at the axial second end, and wire inserting ends which are positioned in the two slot interiors of the stator core and connected with the conductors at the axial first end;

each phase winding also comprises two eighth conductors, each eighth conductor comprises an inner slot part and two welding ends, and the two welding ends are positioned at the two axial ends of the stator core and connected with the inner slot part; the outgoing line of each phase winding is positioned at the first axial end of the stator core and connected with the welding end of the eighth conductor;

each phase winding also comprises a conductor in any conductor group, and the inside of the groove corresponding to the two welding ends of the two eighth conductors connected by the outgoing line and the inside of the two grooves of one conductor of any conductor group of the phase winding are positioned in two circumferentially adjacent grooves of the stator core.

2. The motor stator according to claim 1, wherein the welding ends connected by the lead wires of each phase winding are located at two radially adjacent layers of the stator core, the welding ends connected by the lead wires of the phase winding are located at the nth and N +1 radially-directed layers of the stator core, or the welding ends connected by the lead wires of the phase winding are located at the N +1 and N +2 radially-directed layers of the stator core, and N is an odd number.

3. The electric machine stator according to claim 1, wherein the welding end to which the lead wire of each of the phase windings is connected is located at the same layer in the radial direction of the stator core, and the welding end to which the lead wire of the phase winding is connected is located at the mth layer or the first layer in the radial direction of the stator core.

4. The stator according to claim 2, wherein the inside of the slot corresponding to the welding end connected to the outgoing line of each of the phase windings and the inside of two slots of one conductor of one of the second conductor groups are located in two circumferentially adjacent slots of the stator core; or the inside of the groove corresponding to the welding end connected with the outgoing line of each phase winding and the inside of two grooves of one conductor of one third conductor group are positioned in two circumferentially adjacent grooves of the stator core.

5. The stator according to claim 3, wherein the inside of the slot corresponding to the welding end connected to the outgoing line of each of the phase windings and the inside of two slots of one conductor of one of the first conductor groups are located in two circumferentially adjacent slots of the stator core; or the inside of the groove corresponding to the welding end connected with the outgoing line of each phase winding and the inside of two grooves of one conductor of one fourth conductor group are positioned in two circumferentially adjacent grooves of the stator core.

6. The electric machine stator of claim 1, wherein the phase windings at the second axial end of the stator core have a plurality of first connecting weld ends and a plurality of second connecting weld ends connected together, the weld ends of the same radially adjacent (M-1) th layer at the second axial end of the stator core being the first connecting weld ends, the weld ends of the same radially adjacent (M-1) th layer at the second axial end of the stator core being the second connecting weld ends, M being an even number.

7. The electric machine stator of claim 6, wherein the first conductor set comprises identical first conductors, the pitch of the two slot interiors of each of the first conductors being a full pitch; the fourth conductor group comprises a fourth large conductor and a fourth small conductor, the pitch between the two groove interiors of the fourth large conductor is a long pitch, and the pitch between the two groove interiors of the fourth small conductor is a short pitch.

8. The electric machine stator of claim 7, wherein each conductor of the second conductor set is located in radially adjacent nth and N +1 th layers, respectively, of the stator core;

and each conductor of the third conductor group is respectively positioned in the (N + 1) th layer and the (N + 2) th layer which are radially adjacent to the stator core, wherein N is an odd number.

9. An electrical machine comprising an electrical machine stator according to any one of claims 1 to 8.