CN111478478A

CN111478478A - Motor stator and motor

Info

Publication number: CN111478478A
Application number: CN202010404617.5A
Authority: CN
Inventors: 刘延海; 柏荣键
Original assignee: Tianjin Santroll Electric Automobile Technology Co Ltd
Current assignee: Tianjin Santroll Electric Automobile Technology Co Ltd
Priority date: 2020-05-13
Filing date: 2020-05-13
Publication date: 2020-07-31

Abstract

The invention relates to the field of motors, and discloses a motor stator and a motor, which comprise a stator core, a stator core and a stator core, 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; 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 first coil group and the third coil group are sequentially sleeved along the radial direction of the stator iron core; the invention adopts the winding structure and adopts the completely symmetrical structure on the magnetic circuit, thus eliminating the problem of circulating current generated by the asymmetrical structure; and each interphase busbar is cancelled, direct connection between each interphase and the inside is realized, 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 invention relates to the 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 in types and complex in arrangement mode, a large number of bus bars and bus bars are needed to be used for connecting branches or 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; and each interphase busbar is cancelled, direct connection between each interphase and the inside is realized, the complexity of the manufacturing process is reduced, the production cost is reduced, the material 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;

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 first coil group and the third coil group are sequentially sleeved along the radial direction of the stator iron core;

each coil group comprises a plurality of conductors, each conductor comprises two slot interiors for inserting into different slots;

dividing each slot into M layers according to the number of the slots which can be accommodated in the radial direction of the stator core, wherein M is an odd number which is more than or equal to 3;

the pitch of one part of the conductors in the first coil group is larger than the pole pitch of the stator winding, and the pitch of the other part of the conductors in the first coil group is smaller than the pole pitch of the stator winding; the insides of two grooves of a plurality of conductors in the first coil group are positioned on the same layer;

the pitch of the other coil groups is equal to the pole pitch of the stator windings.

Further, one conductor in one part of conductors in the first coil group and one conductor in the other part of conductors in the first coil group are positioned in the adjacent slots of the stator core, and one conductor in one part of conductors surrounds one conductor in the other part of conductors.

Furthermore, the motor also comprises N second coil groups positioned between the first coil group and the third coil group, wherein the pitch of the second coil groups is equal to the pole pitch of the stator winding, and N is an integer greater than or equal to 1.

Furthermore, each conductor also comprises an outside-slot bending part positioned at one end of the stator core and connected with the insides of the two slots, and the extending directions of the outside-slot bending parts of the two conductors adjacent to each other in the same phase in each coil group are the same.

Furthermore, two slot interiors of each conductor in the second coil group are located in two adjacent layers, and two slot interiors of each conductor in the third coil group are located in two adjacent layers.

Furthermore, each conductor also comprises two out-of-slot ends positioned at the other end of the stator core and connected with the two in-slot parts, and in the other coil groups except the third coil group, the out-of-slot end connected with the in-slot part of each conductor and the in-slot part are positioned on the same layer; the outer end parts of the slots on the same layer are the same in the circumferential extension direction of the stator core and the slot distances are the same, and the outer end parts of the slots on two adjacent layers are opposite in the circumferential extension direction of the stator core.

Furthermore, in the third coil group, the outer end part of the slot connected with the inner part of the slot close to the second coil group is positioned at the same layer with the inner part of the slot; when the third coil group is an outer coil group, except the outer end part of the slot connected with the outgoing line, the outer end part of the slot connected with the inner part of the slot positioned on the outermost layer is positioned on the same layer with the inner part of the slot, and the outer end parts of other slots connected with the inner part of the slot positioned on the outermost layer extend to one side far away from the central axis of the stator core from the layer of the inner part of the slot; when the third coil group is the inner coil group, except the outer end part of the slot connected with the outgoing line, the outer end part of the slot connected with the inner part of the slot positioned on the innermost layer is positioned on the same layer with the inner part of the slot, and other outer end parts of the slot connected with the inner part of the slot positioned on the innermost layer extend from the layer where the inner part of the slot is positioned to one side of the inner part of the slot close to the central axis of the stator core.

Furthermore, in the third coil group, the outer ends of the slots positioned on the same layer have the same extension direction and the same slot pitch along the circumferential direction of the stator core, and the outer ends of the slots positioned on the two adjacent layers have opposite extension directions along the circumferential direction of the stator core; when the third coil group is an outer coil group, the outer end part of the slot extending from the outermost layer to one side far away from the central axis of the stator core is the same in the extending direction of the stator core along the circumferential direction and the same in the slot pitch, and is opposite to the extending direction of the outer end part of the slot positioned on the outermost layer along the circumferential direction of the stator core; when the third coil group is an inner coil group, the outer end part of the slot extending from the innermost layer to one side close to the central axis of the stator core is the same in the circumferential extending direction of the stator core and the slot pitch is the same, and the outer end part of the slot located on the innermost layer is opposite to the circumferential extending direction of the stator core.

Further, the leading-out wire of each branch is located in the innermost winding layer or the outermost winding layer.

In order to achieve the above object, the present invention also provides a motor including the above motor stator.

By applying the technical scheme of the invention, the motor stator and the motor comprise: 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 first coil group and the third coil group are sequentially sleeved along the radial direction of the stator iron core; each coil group comprises a plurality of conductors, each conductor comprises two slot interiors for inserting into different slots; dividing each slot into M layers according to the number of the slots which can be accommodated in the radial direction of the stator core, wherein M is an odd number which is more than or equal to 3; the pitch of one part of the conductors in the first coil group is larger than the pole pitch of the stator winding, and the pitch of the other part of the conductors in the first coil group is smaller than the pole pitch of the stator winding; the insides of two grooves of a plurality of conductors in the first coil group are positioned on the same layer; the pitch of the other coil groups is equal to the pole pitch of the stator windings. 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; and each interphase busbar is cancelled, direct connection between each interphase and the inside is realized, the complexity of the manufacturing process is reduced, the production cost is reduced, the material cost is reduced, and the processing efficiency is improved.

Drawings

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

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

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

FIG. 4 is a schematic diagram of a first large conductor in a first coil group according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a first small conductor in a first coil group according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a third coil assembly in accordance with a first embodiment of the present invention;

FIG. 7 is a schematic diagram of a third conductor forming a third coil set in accordance with one embodiment of the present invention;

FIG. 8 is a schematic diagram of a second conductor forming a third coil set in accordance with one embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a second coil assembly according to a first embodiment of the present invention;

FIG. 10 is a schematic view of a portion of two adjacent slots according to an embodiment of the present invention;

FIG. 11 is a plan view of a phase stator winding in accordance with one embodiment of the present invention;

FIG. 12 is a schematic diagram of an electrical connection in accordance with one embodiment of the present invention;

FIG. 13 is another electrical connection schematic in accordance with one 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 slot pitch is the interval between two slot inner portions 301 of the conductor along the circumferential direction, and the pitch is the interval between the two slot inner portions 301 of the conductor along the circumferential direction; note that, in the present application, the extending direction of the out-of-slot turning portion in the stator core circumferential direction is the extending direction in the stator core circumferential direction from the first slot inner portion 301 of the conductor to the second slot inner portion 301 of the conductor.

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, the stator winding 10 includes a plurality of phase windings mounted on a 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 a circumferential direction of the stator core.

Referring to fig. 1 to 2, in the stator winding 10 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 eight magnetic poles and is such that it is for each phase of the three-phase stator winding 10, the number of slots 21 provided in the stator core 20 is equal to 48 (i.e., 2X8X3), as shown in fig. 11, 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 defined by two adjacent slots 21, one tooth 22, and the stator core 20 is formed by laminating a plurality of annular magnetic steel plates, into which a plurality of insulating papers are inserted, at both end faces in the axial direction of the stator core, and it should be noted that other conventional metal plates may be used instead of the magnetic steel plates.

As shown in fig. 1 and fig. 2, the stator of the electric machine further includes a stator winding 10, which includes a first coil group 110 and a third coil group 130 that are sequentially sleeved along a radial direction of the stator core 20, and each coil group includes a plurality of conductors having two slot interiors.

As shown in 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. in the direction close to the central axis of the stator core, in the present embodiment, the first coil group 110 is located at the inner side of the stator core in the radial direction, and the third coil group 130 is located at the outer side of the stator core in the radial direction, i.e. in the direction away from the central axis of the stator core; 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. in the direction away from the central axis of the stator core, and the third coil group 130 is located at the radial inner side of the stator core, i.e. in the direction close to the central axis of the stator core;

illustratively, as shown in fig. 2, 3, 4, and 5, the first coil group 110 includes 24 conductors, each conductor including: 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 sequentially connected, wherein the two inner slot parts 301 are positioned in two slots which are arranged on the same layer (the first layer close to the rotor direction in the embodiment) of the stator core and are separated by a specified slot distance, the turning part which is positioned at one end of the stator core and is connected with the two inner slot parts 301 is positioned, and the other end of the stator core is positioned at the same layer (the first layer close to the rotor direction in the embodiment) and is connected with the two outer; the 24 conductors of the first coil group include 12 first large conductors 210A and 12 first small conductors 210B, and with reference to fig. 3 to 5 and 10, the pitch between the two slot interiors of the first large conductors 210A is Z, in this embodiment, Z is a long pitch of 7, i.e., greater than the pole pitch of the stator winding, the pitch between the two slot interiors of the first small conductors 210B is X, and in this embodiment, X is a short pitch of 5, i.e., less than the pole pitch of the stator winding.

Referring to fig. 6, 7, and 8, the third coil assembly 130 includes 48 conductors, each of which includes: 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 of two adjacent layers (in the embodiment, the M-1 th layer and the M-th layer close to the rotor direction) of the stator core in the radial direction and are separated by a specified slot pitch, the turning part positioned at one end of the stator core and connected with the two inner slot parts 301 is connected with one end of the stator core, except the outer slot end 303 connected with leading-out wires (a leading end U1, a U2, a leading-out end U3 and a U4), the inner slot part 301 of the M-1 th layer positioned at the other end of the stator core in the outer slot end 303 in the other third coil (in the embodiment, the 24 second conductors 220 in the 48 conductors of the third coil 130 in the middle part of the third coil group in the other end of the stator core) is connected with the same layer in the same layer as the inner slot of the, the other (other is 18 third conductors 230 in the third coil group 130 in this embodiment) slot inner parts of the mth layer at the other end of the stator core are correspondingly connected with the slot outer end parts of the (M + 1) th layer (the M +1 layer extends to the side away from the central axis of the stator core), wherein each phase of the third coil group 130 also comprises 2 conductors connected with outgoing lines (the outgoing lines are outgoing line ends U3 and U4 or leading ends U1 and U2), in this embodiment, the slot outer end parts correspondingly connected in the slot inner parts of the mth layer of the stator core in the 2 conductors connected with the outgoing lines are located in the (M + 1) th layer, of course, the slot outer end parts correspondingly connected in the slot inner parts of the mth layer of the stator core in the 2 conductors connected with the outgoing lines can also be located in the mth layer and directly connected with the outgoing lines (the outgoing line ends U3 and U4 or the leading ends U1 and U2) along; it should be noted that the position of the leading-out wire in the present application is not fixed, that is, the outer end of the slot of the connecting lead terminal can also be used for connecting the outer end of the slot of the appearing terminal, and correspondingly, the outer end of the slot of the connecting lead terminal can also be connected with the outer end of the slot of the leading-out terminal; correspondingly, the third coil group 130 may also be located on one side close to the central axial line of the stator core), except for the outer slot ends connected with the outgoing lines (the lead ends U1, U2, the outgoing line ends U3, U4), the inner slot portion 301 of the 2 nd layer located at the other end 26 of the stator core among the outer slot ends 303 of the remaining third coils is connected with the outer slot end 303 of the corresponding 2 nd layer in the same layer, the inner slot portion of the 1 st layer located at the other end 26 of the stator core (in this embodiment, the 24 second conductors 220 of the 48 conductors of the third coil group 130 are partially referred to as the third coil) is connected with the outer slot end of the corresponding 1 st layer in the same layer, the other (in this embodiment, the 18 third conductors 230 in the third coil group 130) of the 1 st layer located at the other end of the stator core is connected with the outer slot end of the virtual 0 th layer in the corresponding to the inner slot portion (the virtual 0 th layer extends on one, each phase of the third coil group 130 further includes 2 conductors connected to the outgoing lines (outgoing lines U3, U4 or leading lines U1, U2), in this embodiment, the outer ends of the slots correspondingly connected to the inside of the slot on the 1 st layer of the stator core among the 2 conductors connected to the outgoing lines are located in the virtual 0 th layer, and of course, the outer ends of the slots correspondingly connected to the inside of the slot on the 1 st layer of the stator core among the 2 conductors connected to the outgoing lines may also be located in the 1 st layer and directly connected to the outgoing lines (outgoing lines U3, U4 or leading lines U1, U2) along the same layer inside the slot; it should be noted that the position of the leading-out wire in the present application is not fixed, that is, the outer end of the slot connected with the leading-out terminal can also be used for connecting the outer end of the slot connected with the leading-out terminal, and correspondingly, the outer end of the slot connected with the leading-out terminal can also be connected with the outer end of the slot connected with the leading-out terminal; it should be noted that the out-of-slot end portion of the third coil group 130 located in the M-th layer and correspondingly connected to the inside of the slot is located in the M + 1-th layer, the M + 1-th layer is a partial conductor located in the imaginary 0-th layer and extending from one side far away from the central axis of the stator core, or the out-of-slot end portion of the third coil group 130 located in the 1-th layer and correspondingly connected to the inside of the slot is located in one side near the central axis of the stator core, the imaginary 0-th layer is a partial conductor located in the imaginary 0-th layer and extending from one side near the central axis of the stator core, and the out-of-slot end portion of the other part extending from one.

With reference to fig. 6 to 8 and 10, the pitch between the two slot interiors of each of the 48 conductors of the third coil group 130 is Y, and further, the 48 conductors of the third coil group 130 include 24 conductors 230 having a pitch between the two slot interiors of the conductors of Y, and the third coil group 130 further includes 24 conductors 220 having a pitch between the two slot interiors of the conductors of Y, which is 6 in this embodiment, i.e., equal to the pole pitch.

The pole pitch is ×, the coil with pitch larger than the pole pitch of the stator winding is a long-pitch coil, the coil group with pitch equal to the pole pitch is a whole-pitch coil group, the coil with pitch smaller than the pole pitch of the stator winding is a short-pitch coil, concretely, each winding comprises 3 groups of phase conductors, each group of phase conductors comprises two conductors, the pole pitch of each corresponding group of phase conductors is 2, the pole pitch is 2 × 3 is 6, namely the pole pitch of the stator winding 2 is six, the pitch of the first coil group 110 is seven, the pitch of the first coil group is five, the pitch of the third coil group 130 is six, the winding structure adopts a completely symmetrical structure on a magnetic circuit, the problem of circulating current generated by an asymmetrical structure is solved, the inter-phase busbars are cancelled, the inter-phase direct connection is realized, the complexity of the manufacturing process is reduced, the production cost is reduced, the material cost is reduced, and the processing efficiency is improved.

Referring to fig. 3, the two slot interiors 301 of the first large conductor 210A in the first coil group 110 are located in the first layer of the first slot and the first layer of the eighth slot of the stator core; the two slot interiors 301 of the first small conductors 210B in the first coil group 110 are positioned in the first layer of the second slot and the first layer of the seventh slot of the stator core; that is, the first large conductor 210A and the first small conductor 210B of the first coil group 110 are located in the adjacent phase slots of the stator core, and the first large conductor 210A of the first coil group 110 surrounds the first small conductor 210B.

Each slot is divided into M layers according to the number of the slots that can be accommodated in the radial direction of the stator core 20, where M is an integer greater than or equal to 3, the second coil group 120 may be present between the first coil group 110 and the third coil group 130, or the second coil group 120 may be absent, specifically, for an odd-numbered layer motor where M is 3, the number of the middle second coil groups is zero, and preferably, M is preferably 3 to 11 layers. When M is odd, this type of motor is referred to as an odd-layer motor.

Further, N second coil groups 120 may be provided, where N is greater than or equal to 1, that is, a plurality of second coil groups 120 may be provided between the first coil group 110 and the third coil group 130, and hereinafter, for example, M is 5, there is one second coil group 120.

As shown in fig. 1 or 2, each slot is divided into five layers, a first layer, a second layer, a third layer, a fourth layer and a fifth layer, in a direction radial to the stator core 20 and away from the central axis thereof.

Referring to fig. 8 and 9, in the present embodiment, the second coil group 120 includes 48 conductors, each conductor 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 and an outer slot end 303 which are sequentially connected, wherein the two inner slot parts 301 are positioned in two slots of two radially adjacent layers (the second layer and the third layer close to the rotor direction) of the stator core at a specified slot distance, the turning part positioned at one end 25 of the stator core and connected with the two inner slot parts 301, and the two inner slot parts 301 positioned at the other end 26 of the stator core are respectively connected with the two outer slot ends 303 at the same layer (the second layer and the third layer close to the rotor direction); referring to fig. 8 and 10, the pitch between the two slot interiors of each of the 48 conductors 220 of the second coil group 120 is Y, which is 6 in this embodiment, i.e., equal to the pole pitch.

Exemplarily, as shown in fig. 3, the first large U-phase conductor 210A of the 24 conductors of the first coil group 110 is located in the first slot and the eighth slot of the first layer of the stator core, the first small U-phase conductor 210B is located in the second slot and the seventh slot of the first layer of the stator core, the first large V-phase conductor 210A is located in the third slot and the forty-sixth slot of the first layer of the stator core, the first small V-phase conductor 210B is located in the fourth slot and the forty-fifth slot of the first layer of the stator core, the first large W-phase conductor 210A is located in the fifth slot and the twelfth slot of the first layer of the stator core, and the first small W-phase conductor 210B is located in the sixth slot and the eleventh slot of the first layer of the stator core; namely, the extending directions of the out-of-groove bent parts of two adjacent conductors in the same phase (U phase, V phase or W phase) in the first coil group are the same; as shown in fig. 3, the 24 conductors in the first coil group 110 are located in the first layer of the 48 slots of the stator core, and the outer ends of the 24 conductors located outside the slots of the stator core extend in the same direction (all extend counterclockwise along the circumferential direction of the stator core), and the slot pitches extending in the circumferential direction are the same, and are all 3 slot pitches.

With reference to fig. 9, in this embodiment, the first second conductor 220 of the U phase among the 48 second conductors of the second coil group 120 is located in the first slot of the second layer of the stator core and the fourth slot of the third layer, the second conductor 220 of the U phase is located in the second slot of the second layer of the stator core and the fourth slot of the third layer, the first second conductor 220 of the V phase is located in the third slot of the second layer of the stator core and the fourth slot of the third layer, the second conductor 220 of the V phase is located in the fourth slot of the second layer of the stator core and the fourth slot of the third layer, the first second conductor 220 of the W phase is located in the fifth slot of the second layer of the stator core and the forty-seventh slot of the third layer, and the second conductor 220 of the W phase is located in the sixth slot of the second layer of the stator core and the forty slot of the third layer; that is, the extending directions of the out-of-slot turning portions 302 of two conductors adjacent to each other in the same phase in the second coil group 120 are the same, as shown in fig. 9, the 48 conductors in the second coil group 120 are located in the second layer and the third layer of the 48 slots of the stator core, the outer ends of the 48 conductor slots located in the second layer of the stator core are located outside the stator core slot and extend in the same direction (both extend clockwise along the circumferential direction of the stator core) and extend over the same slot pitch in the circumferential direction, and all of the 48 conductor slots located in the third layer of the stator core are located outside the stator core slot and extend in the same direction (both extend counterclockwise along the circumferential direction of the stator core) and extend over the same slot pitch in the circumferential direction, and all of the 48 conductor slots are 3 slot pitches.

Referring to fig. 6, the 48 conductors of the third coil group 130 include 24 third conductors and 24 second conductors 220, the first third conductor 230 of the U-phase of the third coil 130 is located in the first slot of the M-1 th layer and the forty-third slot of the M-th layer of the stator core, the second third conductor 230 of the U-phase is located in the second slot of the M-1 th slot and the forty-fourth slot of the M-th slot of the stator core, the first second conductor 220 of the V-phase is located in the third slot of the M-1 th slot and the forty-fifth slot of the M-1 th slot of the stator core, the second conductor 220 of the V-phase is located in the fourth slot of the M-1 th slot and the forty-sixth slot of the M-th slot of the stator core, the first third conductor 230 of the W-phase is located in the fifth slot of the M-1 th slot and the forty-seventh slot of the M-th slot of the stator core, the second third conductor 230 of the W-phase is located in the sixth slot of the M-1 th slot and the eighteenth slot, m is an odd number, that is, the directions of extension of the out-of-slot bent portions 302 of two conductors adjacent to each other in the third coil group 130 are the same.

Illustratively, as shown in fig. 6, 48 conductors in the third coil group 130 are located in the M-1 th layer and the M-th layer in 48 slots of the stator core, the outer ends of the 48 conductor slots located in the M-1 th layer of the stator core extend in the same direction (all extend clockwise along the circumferential direction of the stator core) outside the stator core slot and extend in the same circumferential direction, and are all 3 slot pitches, the outer ends of the 48 conductors located in the M-th layer of the stator core extend in the same direction (all extend counterclockwise along the circumferential direction of the stator core) outside the stator core slot and extend in the circumferential direction, and are all 3 slot pitches, the outer ends of the 48 conductors located in the M +1 th layer of the stator core extend in the same direction (all extend clockwise along the circumferential direction of the stator core) outside the stator core slot and extend in the same circumferential direction, and are all 3 slot pitches, namely, the extending directions of the outer end parts of the slots of the M layer and the M +1 layer of the stator core are opposite; correspondingly, the third coil can also be positioned on the first layer and the second layer (close to the axial side of the center of the stator core) at the radial inner side of the stator core, the outer ends of the 48 conductors positioned on the second layer in the radial direction of the stator core are positioned outside the stator core slot in the same extending direction (all extend along the circumferential direction of the stator core anticlockwise) and have the same slot pitch extending and crossing in the circumferential direction, and are all 3 slot pitches, the outer ends of the partial slots of the 48 conductors positioned on the 1 st layer of the stator core are positioned outside the stator core slot in the same extending direction (all extend along the circumferential direction of the stator core clockwise) and have the same slot pitch extending and crossing in the circumferential direction, and are all 3 slot pitches, the extension directions of the outer end parts of the partial slots of the 48 conductors on the second virtual O layer of the stator core, which are positioned outside the slots of the stator core, are the same (the partial slots extend along the circumferential direction of the stator core anticlockwise), namely, the outer end parts of the slots on the first virtual 0 layer of the stator core are opposite to the extension direction of the outer end parts of the slots on the first layer.

Illustratively, as shown in fig. 11, any one of the 3 phases of the stator winding 10 is formed by sequentially connecting the U1 winding branches and the U2 winding branches of the U-phase winding in parallel in the circumferential direction of the stator core 20, the outer slot end 303 of the stator winding 10 has an extending end, except the extending end connected to the lead-out wire (the lead-out wire includes a lead end and a neutral point, and the lead end is connected to the neutral point), the 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 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 of the second layer, the two connected outer slot ends 303 are located at the outer circumferential direction of the stator core slot 21 and extend at a pitch of 6, the outer slot end 303 extending end 4 of the third layer adjacent to the stator core 20 in the same radial direction is connected to the outer slot end 303, the pitch of the two connected outer slot end portions 303 extending in the peripheral direction of the stator core slot 21 is 6, the extending end 4 of the outer slot end portion 303 of the fifth layer adjacent to the same radial direction of the stator core 20 is connected with the extending end 4 of the outer slot end portion 303 of the sixth layer, the pitch of the two connected outer slot end portions 303 extending in the peripheral direction of the stator core slot 21 is 6, that is, the pitch of the motor stator winding extending in the circumferential direction at the outer ends of two connected (phase welded) slots located at the outer 26 end of the stator core is 6, in this embodiment, the outgoing lines and the phase welded slot outer ends are both located at one axial end 26 of the stator core, the outgoing lines (neutral points, incoming line ends) of the two branches U1 and U2 are both located at the radial outer layer of the stator core, and correspondingly, may also be located at the radial inner layer of the stator 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; and each interphase busbar is cancelled, direct connection between each interphase and the inside is realized, 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. 12, U-phase conductor lead terminals include U-phase terminals U1 and U2, V-phase terminals V1 and V2 are provided at the V-phase conductor lead terminals, W-phase terminals W1 and W2 are provided at the W-phase conductor lead terminals, U3, U4, V-phase conductor lead terminals V3 and V4 are provided at the W-phase conductor lead terminals W3 and W4, and a connector is used for neutral point connection, i.e., a star connection for connecting 2-branches of an odd-numbered motor in parallel, as shown in fig. 13, U-phase conductor lead terminals U1 and U2 are connected to W-phase conductor lead terminals W3 and W4, W-phase conductor lead terminals W1 and W2 are connected to V-phase conductor lead terminals V3 and V4, V-phase conductor lead terminals V1 and V2 are connected to U-phase conductor lead terminals U3 and U4, i.e., a triangle connection for connecting 2-branches of an odd-numbered motor in parallel.

The embodiment also provides a motor, which comprises the motor stator, and the motor adopting the motor stator can reduce the production cost and improve the production efficiency.

In the present invention, the number of slots per phase per pole is equal to the number of stator slots/number of motor poles/number of phases, and the pole pitch is equal to the number of slots per phase per pole/number of motor poles, and the number of slots is not limited to 48 slots, but may be other numbers of slots, for example: the number of slots of each phase of each pole is 2, the corresponding slot poles of the three-phase motor are matched with a 6-pole 36 slot, a 8-pole 48 slot, a 10-pole 60 slot, a 12-pole 72 slot, a 16-pole 96 slot and the like, and the pole distance is 6; the number of slots of each phase of each pole is 3, and the corresponding three-phase motor slot poles are matched with a 6-pole 54 slot, an 8-pole 72 slot, a 10-pole 90 slot, a 12-pole 108 slot, a 16-pole 144 slot and the like, which are not limited one by one.

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 a predetermined slot pitch 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 first coil group and the third coil group are sequentially sleeved along the radial direction of the stator iron core;

the pitch of one part of the conductors in the first coil group is larger than the pole pitch of the stator winding, and the pitch of the other part of the conductors in the first coil group is smaller than the pole pitch of the stator winding; the inner parts of two grooves of a plurality of conductors in the first coil group are positioned on the same layer;

the pitch of the other coil groups is equal to the pole pitch of the stator winding.

2. The electric machine stator of claim 1, wherein one of the conductors of one of the portions of the first coil group is positioned in a stator core adjacent slot with one of the conductors of the other portion of the first coil group surrounding one of the conductors of the other portion.

3. The stator according to claim 1, further comprising N second coil groups located between the first coil group and the third coil group, the second coil groups having a pitch equal to a pole pitch of a stator winding, wherein N is an integer of 1 or more.

4. The stator according to claim 3, wherein each of the conductors further comprises an out-of-slot turn at one end of the stator core connecting the two slots, and the out-of-slot turns of two conductors adjacent to each other in the same phase in each of the coil groups extend in the same direction.

5. A stator according to claim 3, wherein the two slot interiors of each conductor in the second coil group are located in two adjacent layers, and the two slot interiors of each conductor in the third coil group are located in two adjacent layers.

6. A stator for an electric motor according to claim 3, wherein each of said conductors further includes two out-of-slot ends at the other end of the stator core connecting the insides of two slots, and in the other coil groups except said third coil group, the out-of-slot end connected to each of said in-slot ends of each of said conductors is located at the same level as the inside of the slot; the outer end parts of the slots on the same layer are the same in the circumferential extension direction of the stator core and the slot distances are the same, and the outer end parts of the slots on two adjacent layers are opposite in the circumferential extension direction of the stator core.

7. The stator according to claim 6, wherein in the third coil group, an outer end portion of a slot connected to the inside of the slot adjacent to the second coil group is located on the same layer as the inside of the slot; when the third coil group is an outer coil group, except the outer end part of the slot connected with the outgoing line, the outer end part of the slot connected with the inner part of the slot positioned on the outermost layer is positioned on the same layer with the inner part of the slot, and the outer end parts of other slots connected with the inner part of the slot positioned on the outermost layer extend to one side far away from the central axis of the stator core from the layer of the inner part of the slot; when the third coil group is the inner coil group, except the outer end part of the slot connected with the outgoing line, the outer end part of the slot connected with the inner part of the slot positioned on the innermost layer is positioned on the same layer with the inner part of the slot, and other outer end parts of the slot connected with the inner part of the slot positioned on the innermost layer extend from the layer where the inner part of the slot is positioned to one side close to the central axis of the stator core.

8. The motor stator according to claim 7, wherein in the third coil group, the outer ends of the slots located in the same layer extend in the same direction and at the same slot pitch in the circumferential direction of the stator core, and the outer ends of the slots located in the two adjacent layers extend in opposite directions in the circumferential direction of the stator core; when the third coil group is an outer coil group, the outer end part of the slot extending from the outermost layer to one side far away from the central axis of the stator core is the same in the extending direction of the stator core along the circumferential direction and the same in the slot pitch, and is opposite to the extending direction of the outer end part of the slot positioned on the outermost layer along the circumferential direction of the stator core; when the third coil group is an inner coil group, the outer end part of the slot extending from the innermost layer to one side close to the central axis of the stator core is the same in the circumferential extending direction of the stator core and the slot pitch is the same, and the outer end part of the slot located on the innermost layer is opposite to the circumferential extending direction of the stator core.

9. The electric machine stator according to any one of claims 1 to 8, wherein the outgoing line of each branch is located in the innermost winding layer or the outermost winding layer.

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