CN112290702A - Motor stator and motor - Google Patents

Abstract

The invention provides a motor stator and a motor, comprising: a stator core having a plurality of core slots formed on a radially inner surface thereof and spaced apart at predetermined slot pitches in a circumferential direction of the stator core; the stator winding comprises a plurality of phase windings arranged on a stator core, and each slot is divided into M layers by 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; the number K of slots of each pole and each phase of the stator winding is more than or equal to 2, and each phase winding comprises K parallel branches. The parallel connection of the multiple conductor sets is adopted, a bus bar and a bus bar are omitted, heat dissipation is uniform, power and torque are improved, a wiring mode is simplified, complexity of a manufacturing process is reduced, production cost is reduced, and machining 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

Stator winding includes a plurality of U-shaped conductors, with a plurality of U-shaped conductors according to certain mode of arranging, wears into stator core's inslot, forms the three-phase winding of required motor, need use a large amount of busbars and busbar connection this phase winding between every phase winding among the prior art, stator winding's the mode of arranging is complicated, takes shape the difficulty, high in production cost, machining efficiency is low.

Disclosure of Invention

The invention mainly aims to provide a motor stator and a motor, which cancel a bus bar and a bus bar, have uniform heat dissipation, improve power and torque, simplify a wiring mode, further reduce the complexity of a manufacturing process, reduce production cost and improve processing efficiency.

In order to achieve the above object, according to one aspect of the present invention, there is provided a stator of an electric motor, comprising:

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

the stator winding comprises a plurality of phase windings arranged on a stator core, and each slot is divided into M layers by 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;

every utmost point every looks slot number K of stator winding is more than or equal to 2, and every looks winding all includes K branch circuits that connect in parallel, and stator winding radially overlaps in proper order along stator core and establishes: the stator core comprises a plurality of inner conductor groups, a plurality of middle conductor groups and a plurality of outer conductor groups, wherein each conductor group comprises K conductors, the inner conductor groups are located on the Mth radial layer of the stator core, and the outer conductor groups are located on the first radial layer of the stator core;

the pitch of the K conductors of the inner conductor group is a full pitch, the pitch of the K conductors of the outer conductor group is different from the pitch of the K conductors of the inner conductor group, the pitch of the K conductors of the middle conductor group is different from the pitch of the K conductors of the inner conductor group, or part of the K conductors of the middle conductor group is different from the pitch of the K conductors of the inner conductor group;

each phase winding of the stator winding has a plurality of connection portions each formed by connecting the welding ends of the M-1 layers and the welding ends of the M layers located radially adjacent to the stator core, and the pitch of the plurality of connection portions of each phase winding of the stator winding is different from the pitch of the K conductors of the inner conductor group.

Further, the pitch of the K conductors of the center conductor set of the stator winding is different from the pitch of the plurality of connection portions of the stator winding.

Further, the middle conductor group of the stator winding comprises K identical long-pitch conductors I, and the pitch of the plurality of connecting parts of the stator winding is a short pitch.

Further, the middle conductor group of the stator winding comprises K identical short-pitch conductors II, and the pitch of the plurality of connecting parts of the stator winding is a long pitch.

Further, the K conductors of the middle conductor group of the stator winding are a long-pitch conductor three and a full-pitch conductor four, and the pitch of the plurality of connection portions of the stator winding is a short pitch.

Further, the K conductors of the middle conductor group of the stator winding are a full-pitch conductor five and a short-pitch conductor six, and the pitch of the plurality of connection portions of the stator winding is a long pitch.

Further, the inner conductor set includes K identical conductors nine, and the K conductors of the outer conductor set are a long-pitch conductor seven and a short-pitch conductor eight.

Further, the plurality of intermediate conductor groups are located in the remaining layers except the radial first layer and the radial Mth layer of the stator core.

According to another aspect of the present invention, there is provided an electric machine comprising the electric machine stator described above.

By applying the technical scheme of the invention, the motor stator comprises: a stator core having a plurality of core slots formed on a radially inner surface thereof and spaced apart at predetermined slot pitches in a circumferential direction of the stator core; the stator winding comprises a plurality of phase windings arranged on a stator core, and each slot is divided into M layers by 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; every utmost point every looks slot number K of stator winding is more than or equal to 2, and every looks winding all includes K branch circuits that connect in parallel, and stator winding radially overlaps in proper order along stator core and establishes: the stator core comprises a plurality of inner conductor groups, a plurality of middle conductor groups and a plurality of outer conductor groups, wherein each conductor group comprises K conductors, the inner conductor groups are located on the Mth radial layer of the stator core, and the outer conductor groups are located on the first radial layer of the stator core; the pitch of the K conductors of the inner conductor group is a full pitch, the pitch of the K conductors of the outer conductor group is different from the pitch of the K conductors of the inner conductor group, the pitch of the K conductors of the middle conductor group is different from the pitch of the K conductors of the inner conductor group, or part of the K conductors of the middle conductor group is different from the pitch of the K conductors of the inner conductor group; each phase winding of the stator winding has a plurality of connection portions each formed by connecting the welding ends of the M-1 layers and the welding ends of the M layers located radially adjacent to the stator core, and the pitch of the plurality of connection portions of each phase winding of the stator winding is different from the pitch of the K conductors of the inner conductor group. This application adopt above-mentioned technical scheme, cancel busbar and busbar, the heat dissipation is even, promotes power and moment of torsion, has simplified the mode of connection, and then reduces the preparation technology complexity, reduction in production cost improves machining efficiency.

Drawings

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

fig. 1 is a schematic structural diagram of a stator of 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 diagram of a conductor structure of an inner conductor set in accordance with one embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a middle and outer conductor set according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a conductor structure of a middle conductor set according to a first embodiment of the present invention;

FIG. 6 is a schematic diagram of a middle conductor set structure in the third embodiment of the present invention;

FIG. 7 is a schematic plan view of a phase winding in accordance with 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 in a third embodiment of the present invention;

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

FIG. 11 is a schematic diagram of a parallel connection of two branches according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of another embodiment of the invention in which two branches are connected in parallel;

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, in this application, the radial first layer of the stator core may be the first layer in the axial direction away from the center of the stator core, and may also be the first layer in the axial direction near 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, the stator core 20 having a plurality of core 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, 7 to 10, 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, forms 4 layers in the radial direction of the stator core for the phase windings (U-phase winding or V-phase winding or W-phase winding) in the present embodiment; the even number layers may be four, six, eight, or more even number layers. The motor stator of an embodiment is a motor stator in a hairpin motor.

Referring to fig. 7 to 10, in the stator winding 10 in the first to fourth embodiments of the present invention, 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 winding, V-phase winding, W-phase winding) winding, and each phase slot of each pole is equal to or equal to 2; two slots 21 are provided for each pole of the rotor, the number of slots per pole per phase being 2 in the present embodiment, the rotor has eight poles and is provided 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), and further, in the present embodiment, the stator core 20 defines one tooth 22 by two adjacent slots 21. in the present embodiment, the stator core 20 is formed by laminating a plurality of annular magnetic steel plates to form both end faces 25, 26 in the axial direction of the stator core, and other conventional metal plates may be used instead of the magnetic steel plates.

In this embodiment, each phase winding (U-phase winding, V-phase winding, W-phase winding) includes 2 parallel branches (K is 2 in this embodiment), and the stator winding is radially sleeved along the stator core in sequence: the stator core comprises a plurality of inner conductor groups 100, a plurality of middle conductor groups and a plurality of outer conductor groups, wherein each conductor group (the inner conductor groups 100, the middle conductor groups and the outer conductor groups) comprises 2 conductors, the conductor groups are positioned on the radial 4 th layer of the stator core and comprise 12 inner conductor groups, the 12 inner conductor groups are sequentially positioned in 48 slots on the radial fourth layer of the stator core, and the conductor groups are positioned on the radial 1 st layer of the stator core and comprise 12 outer conductor groups and are sequentially positioned in 48 slots on the radial first layer of the stator core;

as shown in fig. 3 and 7 to 10, in the first to fourth embodiments, the inner conductor set includes: two identical conductor nines 150 (K is 2 in this embodiment), each conductor nine 150 includes two slot interiors 301 located inside the same radial layer of different core slots of the stator core, a wire insertion end 302 located outside the core slot 21, the wire insertion end 302 located outside the axial outer 25 end of the core slot 21 and connected to the two slot interiors 301 of the conductor, two welding ends 303 (both leftward) located outside the core slot and extending in the same direction, the two welding ends 303 located outside the axial outer 26 end of the core slot 21 and connected to the two slot interiors 301 of the conductor in the same layer, the two slot interiors of the conductor nine of the inner conductor group are located in the radial 4 th layer of the stator core, the two slot interiors of the conductor nine of the inner conductor group are located in the 1 st core slot and the 7 th core slot of the radial 4 th layer of the stator core, and the two slot interiors of the other conductor nine of the inner conductor group are located in the 2 nd core slot and the radial first layer of the stator core, The pitch of the 8 th core slot, i.e., the conductor nine, is a full pitch.

As shown in fig. 4 and 7 to 10, in the first to fourth embodiments, the 2 conductors of the outer conductor set 100 are: each conductor in the seven conductors 100A and eight conductors 100B of the outer conductor group comprises two slot interiors 301 located inside different core slots of the same radial layer of the stator core, a wire inserting end 302 located outside the core slot 21 and connected with the two slot interiors 301 of the conductors at the 25 axial outer ends of the core slot 21, two welding ends 303 located outside the core slot and extending in the same direction (both right), the two welding ends 303 located at the 26 axial outer ends of the core slot 21 and connected with the two slot interiors 301 of the conductors in the same layer, and the two slot interiors of each conductor of the outer conductor group are located at the 1 st radial layer of the stator core; 12 one conductor seven 100A of one outer conductor group in the outer conductor group is positioned in the 2 nd core slot and the 9 th core slot of the 1 st layer in the radial direction of the stator core, the conductor eight 100B of the outer conductor group is positioned in the 3 rd core slot and the 8 th core slot of the 1 st layer in the radial direction of the stator core, the pitch of the conductor seven of the outer conductor group is 7, the pitch of the conductor eight of the outer conductor group is 5, namely the pitch of the conductor seven and the conductor eight of the outer conductor group is different from the pitch of the conductor nine of the inner conductor group.

As shown in fig. 5 and 8, in the second embodiment, the second and third layers located in the radial direction of the stator core include 24 middle conductor sets, the 24 middle conductor sets are sequentially located in the 48 slots of the second and third layers in the radial direction of the stator core, and the middle conductor sets include: two identical long-pitch conductors one 250, wherein each long-pitch conductor one 250 comprises two slot interiors 301 located inside two radially adjacent layers of different iron core slots of the stator iron core, a wire inserting end 302 located outside the iron core slot 21 and axially outside 25 ends connected with the two slot interiors 301 of the conductors, two welding ends 303 located outside the iron core slot and extending in opposite directions (the extending directions of the two welding ends are opposite), the two welding ends 303 located outside the iron core slot 21 and axially outside 26 ends are respectively connected with the two slot interiors 301 of the conductors in the same layer, and the two slot interiors of each conductor of the middle conductor group are located on a second layer and a third layer in the radial direction of the stator iron core; one long-pitch conductor one 250 of one middle conductor group in the 24 middle conductor groups is positioned in the second layer, the 1 st iron core slot and the 8 th iron core slot in the radial direction of the stator core, the other long-pitch conductor one 250 of the middle conductor group is positioned in the 2 nd iron core slot and the 9 th iron core slot in the second layer, the third layer and the radial direction of the stator core, the pitch of the conductor one of the middle conductor group is long pitch, and the long pitch is 7 in the embodiment, namely the pitch 7 of the two conductors one 250 of the middle conductor group is different from the pitch 6 of the two conductors nine of the inner conductor group.

As shown in fig. 5 and 7, in the first embodiment, the second and third layers located in the radial direction of the stator core include 24 middle conductor sets, the 24 middle conductor sets are sequentially located in the 48 core slots of the second and third layers in the radial direction of the stator core, and the middle conductor sets include: two identical short-pitch conductors two 250, wherein each short-pitch conductor two 250 comprises two slot interiors 301 located inside two radially adjacent layers of different iron core slots of the stator iron core, a wire inserting end 302 located outside the iron core slot 21 and axially outside 25 ends connected with the two slot interiors 301 of the conductors, two welding ends 303 located outside the iron core slot and extending in opposite directions (the extending directions of the two welding ends are opposite), the two welding ends 303 located outside the iron core slot 21 and axially outside 26 ends are respectively connected with the two slot interiors 301 of the conductors in the same layer, and the two slot interiors of each conductor of the middle conductor group are located on a second layer and a third layer in the radial direction of the stator iron core; 24 one short-pitch conductor two 250 of one middle conductor group in the middle conductor group is positioned in the second layer, the 2 nd core slot and the 7 th core slot in the radial direction of the stator core, and the other short-pitch conductor two 250 of the middle conductor group is positioned in the 3 rd core slot and the 8 th core slot in the second layer, the third layer and the radial direction of the stator core, and the pitch of the conductor two of the middle conductor group is a short pitch, which is 5 in the embodiment, that is, the pitch 5 of the two short-pitch conductors two 250 of the middle conductor group is different from the pitch 6 of the two conductors nine of the inner conductor group.

As shown in fig. 6 and 9, in the third embodiment, the second and third layers in the radial direction of the stator core include 24 middle conductor groups 200, the 24 middle conductor groups 200 are sequentially located in the 48 core slots of the second and third layers in the radial direction of the stator core, the 2 conductors of the middle conductor group 200 are conductor five 200A and conductor six 200B, each conductor in the middle conductor group includes two slot interiors 301 located inside two different core slots in the radial direction of the stator core, a wire insertion end 302 located outside the core slot 21, the wire insertion end 302 located at the axially outer 25 end of the core slot 21 and connected to the two slot interiors 301 of the conductor, two welding ends 303 located outside the core slot and extending in opposite directions (extending directions of the two welding ends are opposite), the two welding ends 303 located at the axially outer 26 end of the core slot 21 and connected to the two slot interiors 301 of the conductor in the same layer, and the two slot interiors of each conductor of the middle conductor group are located in the second layer in the radial direction of the stator core, A third layer; 24 one conductor five 200A of one middle conductor group in the middle conductor group is located in the second layer, the 2 nd core slot and the 8 th core slot in the radial direction of the stator core, and the other conductor six 200B of the middle conductor group is located in the 3 rd core slot and the 7 th core slot in the second layer, the third layer and the radial direction of the stator core, namely, the pitch of the conductor five of the middle conductor group is a whole pitch, in the embodiment, the whole pitch is 6, the pitch of the conductor six of the middle conductor group is a short pitch, in the embodiment, the short pitch is 4, in the embodiment, the pitch 4 of the conductor six 200A in the 2 conductors of the middle conductor group is different from the pitch 6 of the conductor nine of the inner conductor group, and the partial conductors of the middle conductor group are different from the pitches of the two conductors nine of the inner conductor group.

As shown in fig. 6 and 10, in the fourth embodiment, the second layer and the third layer in the radial direction of the stator core include 24 middle conductor groups, the 24 middle conductor groups are sequentially located in the 48 slots of the second layer and the third layer in the radial direction of the stator core, the two conductors of the middle conductor group are conductor three 200A and conductor four 200B, each conductor of the middle conductor group includes two slot interiors 301 located inside two different core slots in the radial direction of the stator core, a wire insertion end 302 located outside the core slot 21, the wire insertion end 302 located outside the core slot 21 in the axial direction 25 end and connected to the two slot interiors 301 of the conductor, two welding ends 303 located outside the core slot in the axial direction and extending in opposite directions (the extending directions of the two welding ends are opposite), the two welding ends 303 located outside the axial direction 26 end of the core slot 21 and connected to the two slot interiors 301 of the conductors in the same layer, the two slot interiors of each conductor of the middle conductor group are located in the second layer in the radial direction of the stator core, and the third layer in the radial direction of the, A third layer; one conductor three 200A of one middle conductor group in the 24 middle conductor groups is located in the second radial layer, the 1 st iron core slot and the 9 th iron core slot of the third radial layer of the stator core, and the other conductor four 200B of the middle conductor group is located in the 2 nd iron core slot and the 8 th iron core slot of the second radial layer and the third radial layer of the stator core, namely, the pitch of the conductor three of the middle conductor group is long pitch, the long pitch is 8 in the embodiment, the pitch of the conductor four of the middle conductor group is full pitch, the full pitch is 6 in the embodiment, namely, the pitch 8 of the conductor three 200B in the 2 conductors of the middle conductor group is different from the pitch 6 of the conductor nine of the inner conductor group, and the partial conductors of the middle conductor group are different from the pitches of the two conductor nines of the inner conductor group.

Referring to fig. 8, in the second embodiment, each phase winding of the stator winding has 30 connection portions, 14 connection portions are formed by connecting the welding ends of the first layer and the second layer which are positioned in the same radial direction of the stator core, 16 welding ends are formed by connecting the welding ends of the third layer and the fourth layer which are positioned in the same radial direction of the stator core, M is 2 and 4 in the present embodiment, specifically, the first connection portion is formed by connecting the welding end of one conductor nine 150 of one inner conductor group positioned in the slot of the 2 nd core slot of the 4 th layer with the welding end of one conductor one 250 of another intermediate conductor group positioned in the slot of the 7 th core slot of the 3 rd layer, and connecting the fourth layer and the third layer in the same radial direction of the stator core, the pitch between the two corresponding to the two welding ends connected by the first connection portion is a short pitch of 5, the second connection portion is formed by connecting a welding end of one conductor of a middle conductor group, namely a conductor 250, located inside a slot of a 2 nd core slot of a 2 nd layer, with a welding end of another conductor group, namely a conductor eight 100B, located inside a slot of a 7 th core slot of a 1 st layer, with the first layer in the same radial direction of the stator core, the pitch between two corresponding slots of the two welding ends connected by the second connection portion is a short pitch 5, accordingly, the connection manner of the remaining 28 connection portions is similar to that of the first and second connection portions, and the pitch of each connection portion is a short pitch 5, and the difference is only that the slots of the conductors are located in different layers, which is not further described herein, i.e., in the second embodiment, the pitch 5 of 30 connection portions of each phase winding is different from the pitch 6 of the conductors of the inner conductor group. According to the technical scheme of the motor stator in the embodiment, the bus bar and the bus bar are omitted, heat dissipation is uniform, power and torque are improved, the wiring mode is simplified, complexity of the manufacturing process is reduced, production cost is reduced, and machining efficiency is improved.

Referring to fig. 7, in the first embodiment, each phase winding of the stator winding has 30 connection portions, 14 connection portions are formed by connecting the welding ends of the first layer and the welding ends of the second layer which are positioned in the same radial direction of the stator core, 16 welding ends are formed by connecting the welding ends of the third layer and the welding ends of the fourth layer which are positioned in the same radial direction of the stator core, M in the first embodiment is 2 and 4, specifically, the first connection portion is formed by connecting the welding end of one conductor nine 150 of one inner conductor group positioned in the slot of the 1 st core slot of the 4 th layer with the welding end of one conductor two 250 of another intermediate conductor group positioned in the slot of the 8 th core slot of the 3 rd layer with the welding end of the other intermediate conductor group positioned in the fourth layer and the third layer in the same radial direction of the stator core, the pitch between the two corresponding to the welding ends connected by the first connection portion is 7, the second connection portion is formed by connecting a welding end of one conductor two 250 of one middle conductor group, which is connected inside a slot of a 1 st core slot of a 2 nd layer, and a welding end of one conductor eight 100B of another outer conductor group, which is connected inside a slot of an 8 th core slot of the 1 st layer, with the first layer in the same radial direction of the stator core, and the pitch between two corresponding slots of two welding ends connected by the second connection portion is a long pitch 7, accordingly, the connection manner of the remaining 28 connection portions is similar to that of the first and second connection portions, and the pitch of each connection portion is a long pitch 7, which is different only in that the slots of the conductors are located in different layers, and further description is not given here, i.e., in the first embodiment, the pitch 7 of 30 connection portions of each phase winding is different from the pitch 6 of the conductors of the inner conductor group. According to the technical scheme of the motor stator in the embodiment, the bus bar and the bus bar are omitted, heat dissipation is uniform, power and torque are improved, the wiring mode is simplified, complexity of the manufacturing process is reduced, production cost is reduced, and machining efficiency is improved.

Referring to fig. 10, in the fourth embodiment, each phase winding of the stator winding has 30 connection portions, 14 connection portions are formed by connecting the welding ends of the first layer and the second layer which are positioned in the same radial direction of the stator core, 16 welding ends are formed by connecting the welding ends of the third layer and the fourth layer which are positioned in the same radial direction of the stator core, M is 2 and 4 in the present embodiment, specifically, the first connection portion is formed by connecting the welding end of one conductor nine 150 of one inner conductor group positioned in the slot of the 2 nd core slot of the 4 th layer with the welding end of one conductor four 200B of another intermediate conductor group positioned in the slot of the 7 th core slot of the 3 rd layer, the pitch between the two corresponding to the two welding ends connected by the first connection portion is a short pitch 5, the second connecting part is formed by connecting the welding end of one conductor four 200B of one middle conductor group positioned in the groove of the 2 nd iron core groove of the 2 nd layer with the welding end of one conductor eight 100B of the other outer conductor group positioned in the groove of the 7 th iron core groove of the 1 st layer with the first layer in the second layer of the stator core in the same radial direction, the pitch between the insides of the two grooves corresponding to the two weld ends to which the second connection connects is a short pitch 5, and, correspondingly, the connection mode of the other 28 connection parts is similar to that of the first and second connection parts, the pitch of each connection part is a short pitch 5, the difference is that the inside of the groove of the conductor is positioned in different layer grooves, which is not further described, that is, in the fourth embodiment, the pitch 5 of the 30 connections of each phase winding is different from the pitch 6 of the conductors of the inner conductor group. According to the technical scheme of the motor stator in the embodiment, the bus bar and the bus bar are omitted, heat dissipation is uniform, power and torque are improved, the wiring mode is simplified, complexity of the manufacturing process is reduced, production cost is reduced, and machining efficiency is improved.

With reference to fig. 9, in the third embodiment, each phase winding of the stator winding has 30 connection portions, 14 connection portions are formed by connecting the welding terminals of the first layer and the welding terminals of the second layer which are positioned in the same radial direction of the stator core, 16 welding terminals are formed by connecting the welding terminals of the third layer and the welding terminals of the fourth layer which are positioned in the same radial direction of the stator core, M in this embodiment is 2, 4, specifically, the first connection portion is formed by connecting the welding terminal of one conductor nine 150 of one inner conductor group positioned in the slot of the 1 st core slot of the 4 th layer with the welding terminal of one conductor five 200A of another intermediate conductor group positioned in the slot of the 8 th core slot of the 3 rd layer with the welding terminal of the other intermediate conductor group positioned in the fourth layer and the third layer in the same radial direction of the stator core, the pitch between the two corresponding to the welding terminals connected by the first connection portion is 7, the second connecting part is formed by connecting the welding end of one conductor six 200B of one middle conductor group positioned in the groove of the 1 st iron core groove of the 2 nd layer with the welding end of one conductor eight 100B of the other outer conductor group positioned in the groove of the 8 th iron core groove of the 1 st layer in the second layer of the stator iron core in the same radial direction with the first layer, the pitch between the insides of the two grooves corresponding to the two weld ends connected by the second connecting portion is a long pitch 7, and, correspondingly, the connection mode of the other 28 connection parts is similar to that of the first and second connection parts, the pitch of each connection part is a long pitch 7, the difference is that the inner part of the groove of the conductor is positioned in different layer grooves, which is not further described, that is, in embodiment three, the pitch 7 of the 30 connections of each phase winding is different from the pitch 6 of the conductors of the inner conductor group. According to the technical scheme of the motor stator in the embodiment, the bus bar and the bus bar are omitted, heat dissipation is uniform, power and torque are improved, the wiring mode is simplified, complexity of the manufacturing process is reduced, production cost is reduced, and machining efficiency is improved.

In the first embodiment, the pitch of 2 identical conductors one of the middle conductor group of the stator winding is a long pitch (the long pitch is 7 in the first embodiment), and the pitch of 30 connecting parts of the stator winding is a short pitch (the short pitch is 5 in the first embodiment);

in the second embodiment, the pitch of 2 identical conductors two of the middle conductor group of the stator winding is a short pitch (the short pitch is 5 in the second embodiment), and the pitch of 30 connection portions of the stator winding is a long pitch (the long pitch is 7 in the second embodiment);

in the third embodiment, the pitch of the third conductor of the middle conductor group of the stator winding is a long pitch 8 (the long pitch is 8 in the third embodiment), the pitch of the fourth conductor is a full pitch (the full pitch is 6 in the third embodiment), and the pitch of the 30 connection portions of the stator winding is a short pitch (the short pitch is 5 in the third embodiment);

in the fourth embodiment, the pitch of the conductor five of the intermediate conductor group of the stator winding is a full pitch (the full pitch is 6 in the fourth embodiment), the pitch of the conductor six is a short pitch (the short pitch is 4 in the fourth embodiment), and the pitch of the 30 connection portions of the stator winding is a long pitch (the long pitch is 7 in the fourth embodiment);

in the first to fourth embodiments, the pitch of the 2 identical conductors nine of the inner conductor group of the stator winding is a full pitch (in the first embodiment, the full pitch is 6), the pitch of one conductor seven of the 2 conductors of the outer conductor group is a long pitch (in the first embodiment, the long pitch is 7), and the pitch of the other conductor eight of the outer conductor group is a short pitch (in the second embodiment, the short pitch is 5).

In the first to fourth embodiments, the middle conductor set is located in the remaining layers except the first layer and the mth layer in the radial direction of the stator core, when M is 4, the middle conductor set is located in the second layer and the third layer in the radial direction of the stator core, and when M is 6, the middle conductor set is located in the second layer, the third layer, the fourth layer and the fifth layer in the radial direction of the stator core.

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 (9)

1. An electric machine stator comprising:

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

the stator winding comprises a plurality of phase windings arranged on the stator core, and each slot is divided into M layers by 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;

the method is characterized in that: every utmost point of stator winding is per phase slot number K for more than or equal to 2, every phase winding all includes K branch circuits that connect in parallel, stator winding radially overlaps in proper order along stator core and establishes: the stator core comprises a plurality of inner conductor groups, a plurality of middle conductor groups and a plurality of outer conductor groups, wherein each conductor group comprises K conductors, the inner conductor groups are located on the Mth radial layer of the stator core, and the outer conductor groups are located on the first radial layer of the stator core;

the pitch of the K conductors of the inner conductor group is a full pitch, the pitch of the K conductors of the outer conductor group is different from the pitch of the K conductors of the inner conductor group, the pitch of the K conductors of the middle conductor group is different from the pitch of the K conductors of the inner conductor group, or part of the K conductors of the middle conductor group is different from the pitch of the K conductors of the inner conductor group;

each phase winding of the stator winding is provided with a plurality of connecting parts, each connecting part is formed by connecting the welding end of the M-1 layer and the welding end of the M layer which are positioned in the radial direction of the stator core, and the pitch of the plurality of connecting parts of each phase winding of the stator winding is different from the pitch of the K conductors of the inner conductor group.

2. The electric machine stator of claim 1, wherein a pitch of the K conductors of the center conductor set of the stator winding is different than a pitch of the plurality of the connections of the stator winding.

3. The electric machine stator of claim 2, wherein the intermediate conductor set of the stator winding includes K identical long-pitch conductors one, and wherein the pitch of the plurality of connections of the stator winding is a short pitch.

4. The electric machine stator of claim 2, wherein the intermediate conductor set of the stator winding includes K identical second short-pitch conductors, and wherein the pitch of the plurality of connection portions of the stator winding is a long pitch.

5. The electric machine stator of claim 2, wherein the K conductors of the center conductor set of the stator winding are long pitch three and full pitch four conductors, and the pitch of the plurality of connections of the stator winding is short pitch.

6. The electric machine stator of claim 2, wherein the K conductors of the center conductor set of the stator winding are full-pitch five and short-pitch six conductors, and wherein the pitch of the plurality of connections of the stator winding is long-pitch.

7. The electric machine stator of claim 1, wherein the inner conductor set comprises K identical conductors nine, the K conductors of the outer conductor set being seven long-pitch conductors and eight short-pitch conductors.

8. The electric machine stator of any one of claims 1 to 7, wherein a plurality of the intermediate conductor sets are located in the remaining layers except the first radial layer of the stator core and the mth radial layer of the stator core.

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

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