CN212784946U - Motor stator and motor - Google Patents

Abstract

The utility model relates to the field of motors, and discloses a motor stator and a motor, which comprises a stator core, a stator core and a motor 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; the method is characterized in that: at least two branch windings in each phase winding are sequentially connected in parallel along the circumferential direction of the stator core; the phase winding includes at least 4 third U-shaped conductors; the utility model discloses a winding structure has adopted complete symmetrical structure on magnetic circuit, has eliminated because the loop current problem that asymmetric structure produced, and it is undulant to reduce the torque, and the harmonic is few, and the noise reduction, the mode of arranging is simple, reduces the use of busbar and busbar, and the branch road and the neutral point connected mode of each phase winding are simple, simplify manufacturing procedure, have reduced manufacturing cost, improve machining efficiency.

Description

Motor stator and motor

Technical Field

The utility model relates to a motor field especially relates to a motor stator and motor.

Background

In the prior art, a stator winding comprises a plurality of types of conductor coils, and the plurality of types of conductor coils penetrate into a slot of a stator core according to a certain arrangement mode to form a required winding of a single-phase motor or a multi-phase motor. The hairpin coils used in the prior art are more in special-shaped types and complex in arrangement mode, a large number of bus bars and bus bars are needed to be used for connecting branches and neutral points of windings of each phase, the manufacturing process is complex, the production cost is high, and the processing efficiency is low.

SUMMERY OF THE UTILITY MODEL

The utility model provides a motor stator and motor has adopted complete symmetrical structure on magnetic circuit through the winding structure, has eliminated because the loop current problem that asymmetric structure produced, and it is undulant to reduce the torque, and the harmonic is few, the noise reduction, and the mode of arranging is simple, reduces the use of busbar and busbar, and the branch road and the neutral point connected mode of each phase winding are simple, simplify manufacturing procedure, have reduced manufacturing cost, improve machining efficiency.

To achieve the purpose, the utility model adopts the following technical proposal:

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;

at least two branch windings in each phase winding are sequentially connected in parallel along the circumferential direction of the stator core;

the phase winding includes:

at least 4 third U-shaped conductors,

a plurality of conductor sets, each conductor set comprising: a first U-shaped conductor and a second U-shaped conductor,

each U-shaped conductor comprises two groove interiors for inserting into different grooves, and the two groove interiors of the second U-shaped conductor are positioned in the interval between the two groove interiors of the first U-shaped conductor;

the pitch between the inner parts of the two grooves of each U-shaped conductor of each phase winding is smaller than or equal to the pole pitch;

the phase winding further includes: the two U-shaped conductors are positioned at the connecting part connected outside the axial slot of the stator core,

the connecting portion includes: a first connecting part, a second connecting part,

each U-shaped conductor further comprises: one end of the stator core positioned outside the axial slots is connected with two welding ends inside the two slots;

the first connecting part is formed by connecting one welding end of each third U-shaped conductor of the phase winding and one welding end of the first U-shaped conductor of one conductor group of the phase winding with each other, and connecting the other welding end of each third U-shaped conductor of the phase winding and one welding end of the second U-shaped conductor of the other conductor group of the phase winding with each other;

the second connecting portion connects one welding end of the first U-shaped conductor of one conductor set of the phase winding and one welding end of the second U-shaped conductor of the other conductor set of the phase winding to each other.

Further, the pitch between the two inside slots of the first U-shaped conductor of each conductor group of the phase winding is equal to the pole pitch of the stator winding, the pitch between the two inside slots of the second U-shaped conductor of each conductor group of the phase winding is smaller than the pole pitch of the stator winding, and the difference between the pitch between the two inside slots of the first U-shaped conductor and the pitch between the two inside slots of the second U-shaped conductor is 2; the pitch between the two slot interiors of the third U-shaped conductor of the phase winding is smaller than the pole pitch of the stator winding.

Further, when the pitch between the two inside slots of the first U-shaped conductor of each conductor group of the phase winding is equal to the pole pitch of the stator winding, the pitch between the two inside slots of the second U-shaped conductor of each conductor group of the phase winding is smaller than the pole pitch of the stator winding, and the pitch between the two inside slots of the third U-shaped conductor of the phase winding is smaller than the pole pitch of the stator winding, the pitch between each connecting portion connected to one end of the stator core located outside the axial slot is a long pitch.

Further, the pitch between the two slot interiors of the first U-shaped conductor of the conductor set is 6, the pitch between the two slot interiors of the second U-shaped conductor of the conductor set is 4, the pitch between the two slot interiors of the third U-shaped conductor is 5, and the pitch between each connecting portion located at one end of the stator core axially outside the slots and connected therewith is 7.

Furthermore, the stator winding further comprises an outgoing line positioned on the radial outermost layer of the stator core and/or an outgoing line positioned on the radial innermost layer of the stator core, and the outgoing line is positioned at the other end outside the axial slot of the stator core.

Further, the two slot interiors of each U-shaped conductor are located in two radially adjacent layers of the stator core.

Furthermore, except that the two inner parts of the two slots of each U-shaped conductor of the phase winding positioned in the same radial direction of the outgoing line are positioned on the N-th layer and the (N + 1) -th layer which are adjacent to each other in the radial direction of the stator core, the two inner parts of the two slots of the other U-shaped conductors of the phase winding are positioned on the N-th layer and the (N-1) -th layer which are adjacent to each other in the radial direction of the stator core, wherein N is an even number which is more than.

Furthermore, except that the two grooves of each U-shaped conductor of the phase winding positioned in the same radial direction of the outgoing line are positioned on the N-th layer and the N + 1-th layer which are adjacent to each other in the radial direction of the stator core, any one U-shaped conductor positioned on the N-th layer and the N + 1-th layer is arranged in the rest area in the circumferential direction of the stator core, wherein N is an even number which is more than or equal to 2.

Furthermore, each U-shaped conductor of the phase winding located in the same radial direction of the outgoing line is a third U-shaped conductor, or each U-shaped conductor of the phase winding located in the same radial direction of the outgoing line is a first U-shaped conductor, a second U-shaped conductor and a third U-shaped conductor.

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 utility model, the stator core of the motor comprises a plurality of grooves which are formed on the radial inner surface of the stator core and are spaced at a preset groove distance 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; at least two branch windings in each phase winding are sequentially connected in parallel along the circumferential direction of the stator core; the phase winding includes at least 4 third U-shaped conductors, a plurality of conductor sets, each conductor set including: a first U-shaped conductor and a second U-shaped conductor, each U-shaped conductor including two slot interiors for insertion into different slots, the two slot interiors of the second U-shaped conductor being located within the spacing of the two slot interiors of the first U-shaped conductor; the pitch between the inner parts of the two grooves of each U-shaped conductor of each phase winding is smaller than or equal to the pole pitch; the phase winding further includes: two U-shaped conductors are located the outer connecting portion that connects of stator core axial slot, and connecting portion include: first connecting portion, second connecting portion, every U-shaped conductor still includes: one end of the stator core positioned outside the axial slots is connected with two welding ends inside the two slots; the first connecting part is formed by connecting one welding end of each third U-shaped conductor of the phase winding and one welding end of the first U-shaped conductor of one conductor group of the phase winding with each other, and connecting the other welding end of each third U-shaped conductor of the phase winding and one welding end of the second U-shaped conductor of the other conductor group of the phase winding with each other; the second connecting portion connects one welding end of the first U-shaped conductor of one conductor set of the phase winding and one welding end of the second U-shaped conductor of the other conductor set of the phase winding to each other. The winding structure adopts a completely symmetrical structure on a magnetic circuit, eliminates the problem of loop current generated by an asymmetrical structure, reduces torque fluctuation, has less harmonic waves, reduces noise, has simple arrangement mode, reduces the use of a bus bar and a bus bar, has simple branch and neutral point connection mode of each phase winding, simplifies the manufacturing process, reduces the production cost and improves the processing efficiency.

Drawings

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

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

FIG. 3 is a schematic structural view of an insulation paper in a slot of a stator of a first motor according to an embodiment of the present invention;

fig. 4 is a schematic structural view of insulation paper in a stator slot of a second motor according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of an insulation paper in a stator slot of a third motor according to an embodiment of the present invention;

FIG. 6 is a schematic structural view of an insulation paper in a slot of a fourth motor stator according to an embodiment of the present invention;

fig. 7 is a schematic diagram of a conductor set forming a stator winding according to an embodiment of the present invention;

fig. 8 is a schematic diagram of a third U-shaped conductor forming a stator winding according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a partial connection of a middle phase winding according to an embodiment of the present invention;

fig. 10A is a schematic diagram of a planar expansion of a plug end of a middle phase winding according to an embodiment of the present invention;

fig. 10B is a schematic diagram of a plane expansion of the welding end of a middle phase winding according to an embodiment of the present invention;

fig. 11 is a schematic structural view of a motor stator according to a second embodiment of the present invention;

fig. 12 is a schematic structural diagram of a phase winding according to a second embodiment of the present invention;

fig. 13 is a schematic diagram of a plane expansion of the plug end of the phase winding according to the second embodiment of the present invention;

fig. 14 is a schematic structural view of a motor stator in the third embodiment of the present invention;

fig. 15 is a schematic structural diagram of a phase winding in the third embodiment of the present invention;

fig. 16 is a schematic diagram of a plane expansion of the plug end of the phase winding in the third embodiment of the present invention;

fig. 17 is a schematic structural view of a motor stator according to a fourth embodiment of the present invention;

fig. 18 is a schematic structural diagram of a phase winding in the fourth embodiment of the present invention;

fig. 19 is a schematic diagram of a partial connection of a four-phase winding according to an embodiment of the present invention;

fig. 20 is a schematic diagram of a plane expansion of a plug end of a phase winding in the fourth embodiment of the present invention;

fig. 21 is a schematic structural view of a motor stator in the fifth embodiment of the present invention;

fig. 22 is a schematic structural diagram of a phase winding in the fifth embodiment of the present invention;

fig. 23 is a schematic diagram of a plane expansion of a plug end of a phase winding in the fifth embodiment of the present invention;

fig. 24 is a schematic structural view of a stator of a motor according to a sixth embodiment of the present invention;

fig. 25 is a schematic structural diagram of a phase winding in a sixth embodiment of the present invention;

fig. 26 is a schematic diagram of a plane expansion of a plug end of a phase winding in six embodiments of the present invention;

FIG. 27 is a schematic diagram of a star-shaped electrical connection in an embodiment of the present invention;

FIG. 28 is a schematic view of another star-shaped electrical connection in accordance with an embodiment of the present invention;

fig. 29 is a schematic diagram of a triangular electrical connection in an embodiment of the invention;

fig. 30 is a schematic view of another triangular electrical connection in an embodiment of the 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 intended to limit a specific order. The embodiments of the present invention can be implemented individually, and can be implemented by combining each other between the embodiments, and the embodiments of the present invention are not limited to this.

In the present application, the pitch is the interval between two groove inner portions 301 of the same conductor in the circumferential direction, and the pitch is the interval between the groove inner portion 301 corresponding to one welding end of one conductor and the groove inner portion 301 corresponding to one welding end of the other conductor in the circumferential direction.

As shown in fig. 1, an embodiment of the present invention provides a motor stator, 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, 11 to 12, 14 to 15, 17 to 18, 21 to 22, and 24 to 25, 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.

With reference to fig. 1 to 2, 11 to 12, 14 to 15, 17 to 18, 21 to 22, 24 to 25, 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 per pole is equal to 2; each magnetic pole of the rotor is provided with two slots 21, the number of slots per pole per phase is 2 in the embodiment, the rotor has eight magnetic poles and is corresponding to each phase of the three-phase stator winding 10, the number of the slots 21 arranged in the stator core 20 is equal to 48 (namely 2X8X3), as shown in FIGS. 1-2 and 17-19, 4 branch windings in each phase winding are sequentially connected in parallel along the circumferential direction of the stator core, U1, U2, U11 and U12 branch windings in the U phase winding are sequentially connected in parallel along the circumferential direction of the stator core, V1, V2, V11 and V12 branch windings in the V phase winding are sequentially connected in parallel along the circumferential direction of the stator core, and W1, W2, W11 and W12 branch windings in the W phase winding are sequentially connected in parallel along the circumferential direction of the stator core;

as shown in fig. 11 to 12, 14 to 15, 21 to 22, and 24 to 25, 2-branch windings in each phase winding are sequentially connected in parallel along the circumferential direction of the stator core, U1 and U2-branch windings in the U-phase winding are sequentially connected in parallel along the circumferential direction of the stator core, V1 and V2-branch windings in the V-phase winding are sequentially connected in parallel along the circumferential direction of the stator core, and W1 and W2-branch windings in the W-phase winding are sequentially connected in parallel along the circumferential direction of the stator core;

further, in the present embodiment, the stator core 20 is formed by stacking a plurality of annular magnetic steel plates to form the stator core axial direction both end faces 25, 26 of the stator core 20 by defining one tooth portion 22 by two adjacent slots 21, and other conventional metal plates may be used instead of the magnetic steel plates; as shown in fig. 3, 4, 5, and 6, a plurality of insulating papers 30 are inserted into the magnetic steel plate slots 21, fig. 3 shows that the first type of in-slot insulating paper 30 in the present embodiment is B-shaped insulating paper, fig. 4 shows that the second type of in-slot insulating paper 30 in the present embodiment is S-shaped insulating paper, fig. 5 shows that the third type of in-slot insulating paper 30 in the present embodiment is large S-shaped insulating paper, any one of the three types of in-slot insulating paper can be selected in the present embodiment to isolate the inter-phase conductors in the slots 21, and fig. 6 shows that the fourth type of in-slot insulating paper 30 in the present embodiment is single large-mouth-shaped insulating paper, when the conductor insulation is selected to be thicker, isolation is not required in the middle, and the fourth type of in-slot insulating paper 30 can be used.

As shown in fig. 2, 12, 15, 18, 22, and 25, in the first to third embodiments, each of the phase windings (U-phase winding, V-phase winding, and W-phase winding) includes: 12 third U-shaped conductors 450 and 24 conductor groups 400, wherein each conductor group 400 comprises a first U-shaped conductor 400A and a second U-shaped conductor 400B, each U-shaped conductor (400A, 400B and 450) comprises a welding end 303, a slot inner 301, a plug end 302, a slot inner 301 and a welding end 303 which are sequentially connected, and the two slot inner 301 are inserted into different slots of two layers of radial adjacent stator cores.

In the fourth to sixth embodiments, each of the phase windings (U-phase winding, V-phase winding, W-phase winding) includes: 4 third U-shaped conductors 450 and 28 conductor groups 400, wherein each conductor group 400 comprises a first U-shaped conductor 400A and a second U-shaped conductor 400B, each U-shaped conductor (400A, 400B and 450) comprises a welding end 303, a slot inner 301, a plug end 302, a slot inner 301 and a welding end 303 which are sequentially connected, and the two slot inner 301 are inserted into different slots of two layers of stator cores which are adjacent in the radial direction; that is, in the present embodiment, each phase winding includes at least 4 third U-shaped conductors 450.

With reference to fig. 7 and 9, in the first to sixth embodiments, the two slot interiors 301 of the second U-shaped conductor 400B are located in the 3 rd slot and the 7 th slot of the stator core, and the two slot interiors 301 of the first U-shaped conductor 400A are located in the 2 nd slot and the 8 th slot of the stator core; that is, the two slot interiors 301 of the second U-shaped conductor 400B in the stator core circumferential slot are located within the pitch of the two slot interiors 301 of the first U-shaped conductor 400A; as shown in fig. 8 and 9, the two slots of the third U-shaped conductor 450 are located in the 26 th slot and the 31 th slot of the stator core.

As shown in fig. 2, 7, 8, 9, 12, and 15, in the first to sixth embodiments, the pitch between the two slot interiors 301 of the first U-shaped conductor 400A of each conductor group 400 of the phase winding (U-phase winding, V-phase winding, and W-phase winding) is Y (Y is 6 equal to the full pitch of the pole pitch 6 of the stator winding in the present embodiment), the pitch between the two slot interiors 301 of the second U-shaped conductor 400B of each conductor group 400 is X1 (X1 is 4 smaller than the short pitch of the pole pitch 6 of the stator winding in the present embodiment), and the pitch between the two slot interiors 301 of the third U-shaped conductor 450 is X2 (X2 is 5 smaller than the short pitch of the pole pitch 6 of the stator winding in the present embodiment), that is, the pitch between the two slot interiors 301 of each U-shaped conductor of the phase winding is smaller than or equal to the pole pitch;

with reference to fig. 1 to 26, in the present embodiment, each phase winding further includes: one welding end of one U-shaped conductor, which is positioned at the outer 25 end of the axial slot of the stator core, is connected with one welding end of the other U-shaped conductor, which is positioned at the outer 25 end of the axial slot of the stator core, to form a connecting part, each phase of winding comprises a first connecting part and a second connecting part, the end of each U-shaped conductor, which is positioned at the outer 25 end of the axial slot of the stator core, is connected with two welding ends 303 of the two slot interiors 301 on the same layer, and the extending directions of the two welding ends 303, which are positioned at the outer 25 end;

as shown in figures 9, 10A, 10B, 13, 16, 20, 23 and 26, in the first to sixth embodiments, the welding ends of the first and third U-shaped conductors 450 of the phase winding, which are connected inside the slot of the 26 th slot of the sixth layer of the stator core, and the welding ends of the second U-shaped conductor 400B of one conductor set 400, which are connected inside the slot of the 19 th slot of the fifth layer of the stator core, are connected with each other at the first and third connection portions of the phase winding (U-phase winding or V-phase winding or W-phase winding) and form a pitch of 7 in the circumferential direction of the stator core, the welding end connected with the first and third U-shaped conductors 450 of the phase winding positioned in the 31 st slot of the seventh layer of the stator core and the welding end connected with the first U-shaped conductor 400A of the other conductor group 400 positioned in the 38 th slot of the eighth layer of the stator core are connected with each other and form a pitch of 7 in the circumferential direction of the stator core; correspondingly, the second first connecting part is that the welding end of the second third U-shaped conductor 450 of the phase winding connected in the slot of the 27 th slot of the sixth layer of the stator core and the welding end of the first U-shaped conductor 400A of one conductor group 400 connected in the slot of the 20 th slot of the fifth layer of the stator core are connected with each other and form a pitch of 7 in the circumferential direction of the stator core, and the welding end of the second third U-shaped conductor 450 of the phase winding connected in the 32 th slot of the seventh layer of the stator core and the welding end of the second U-shaped conductor 400B of the other conductor group 400 connected in the slot of the 39 th slot of the eighth layer of the stator core are connected with each other and form a pitch of 7 in the circumferential direction of the stator core; the third first connecting part is that the welding end of the third U-shaped conductor 450 of the phase winding, which is positioned in the groove of the sixth layer 20 th groove of the stator core, is connected with the welding end of the second U-shaped conductor 400B of one conductor group 400, which is positioned in the groove of the fifth layer 13 th groove of the stator core, and the pitch is 7 in the circumferential direction of the stator core, and the welding end of the third U-shaped conductor 450 of the phase winding, which is positioned in the seventh layer 25 th groove of the stator core, is connected with the welding end of the first U-shaped conductor 400A of the other conductor group 400, which is positioned in the groove of the eighth layer 32 th groove of the stator core, is connected with the welding end of the first U-shaped conductor 400A of the other conductor group 400, and the pitch is; correspondingly, the fourth first connecting part is that the welding end of the fourth and third U-shaped conductors 450 of the phase winding, which is connected in the slot of the 21 st slot of the sixth layer of the stator core, and the welding end of the first U-shaped conductor 400A of one conductor group 400, which is connected in the slot of the fifth and 14 th slot of the stator core, are connected with each other and form a pitch of 7 in the circumferential direction of the stator core, and the welding end of the fourth and third U-shaped conductors 450 of the phase winding, which is connected in the 26 th slot of the seventh layer of the stator core, and the welding end of the second U-shaped conductor 400B of the other conductor group 400, which is connected in the slot of the 33 th slot of the 8 th layer of the stator core, are connected with each other and form a pitch of 7 in the circumferential; that is, each phase winding (U-phase winding or V-phase winding or W-phase winding) in the first to sixth embodiments includes at least 4 third U-shaped conductors 450, at least 4 first connection portions, each of which is such that one welding terminal 303 of one third U-shaped conductor 450 in the phase winding and one welding terminal 303 of the first U-shaped conductor 400A of one conductor set 400 are connected to each other, and the other welding terminal 303 of the third U-shaped conductor 450 of the phase winding and one welding terminal 303 of the second U-shaped conductor 400B of the other conductor set 400 are connected to each other.

Alternatively, as shown in fig. 9, 10A, 10B, 13, and 16 in the first to third embodiments, the phase winding (U-phase winding or V-phase winding or W-phase winding) further includes a fifth first connection portion, that is, a weld end of the fifth third U-shaped conductor 450 of the phase winding connected inside the 26 th slot of the fourth layer of the stator core and a weld end of the second U-shaped conductor 400B of one conductor group 400 connected inside the 19 th slot of the third layer of the stator core are connected to each other and form a pitch of 7 in the circumferential direction of the stator core, and a weld end of the fifth third U-shaped conductor 450 of the phase winding connected inside the fifth layer 31 th slot of the stator core and a weld end of the first U-shaped conductor 400A of the other conductor group 400 connected inside the fifth layer 38 th slot of the stator core are connected to each other and form a pitch of 7 in the circumferential direction of the stator core; with reference to fig. 10A, 13, and 16, in the first to third embodiments, a sixth first connection portion, a seventh first connection portion, an eighth first connection portion, a ninth first connection portion, a tenth first connection portion, an eleventh first connection portion, and a twelfth first connection portion are further included, which is not further described herein.

Further, as shown in fig. 9, 10A, 10B, 13, and 16, in the first to third embodiments, each phase winding (U-phase winding or V-phase winding or W-phase winding) is a second connection portion except the 12 first connection portions, and the second connection portion is a connection portion where one welding end of the first U-shaped conductor of one conductor set of the phase and one welding end of the second U-shaped conductor of the other conductor set are connected to each other and a pitch of 7 is formed in the circumferential direction of the stator core; specifically, the first second connecting portion is formed by connecting one welding end 303 on the right side of the first U-shaped conductor 400A of the conductor group 400 of the 2 nd and 8 th slots of the stator core and one welding end 303 on the left side of the second U-shaped conductor 400B of the conductor group 400 of the 15 th and 19 th slots of the stator core to each other along the circumferential direction of the stator core 20, and forming a pitch of 7 in the circumferential direction of the stator core, and the second connecting portion is formed by connecting one welding end 303 on the left side of the first U-shaped conductor 400A of the conductor group 400 of the 2 nd and 8 th slots of the stator core and one welding end 303 on the right side of the second U-shaped conductor 400B of the conductor group of the 43 th and 39 th slots of the stator core 20 along the circumferential direction of the stator core and forming a pitch of 7 in the circumferential direction of the stator core; the third second connecting portion is formed by connecting one welding end 303 located on the right side of the second U-shaped conductor 400B of the conductor group of the 3 rd slot and the 7 th slot of the stator core 20 in the circumferential direction of the stator core and one welding end 303 located on the left side of the first U-shaped conductor 400A of the 14 th slot and the 20 th slot of the stator core with each other and forming a pitch of 7 in the circumferential direction of the stator core, and the fourth second connecting portion is formed by connecting one welding end 303 located on the left side of the second U-shaped conductor 400B of the conductor group 400 of the 3 rd slot and the 7 th slot of the stator core 20 in the circumferential direction of the stator core and one welding end 303 located on the right side of the first U-shaped conductor 400A of the conductor group of the 44 th slot and the 38 th slot of the stator core with each other and. The winding structure adopts a completely symmetrical structure on a magnetic circuit, eliminates the problem of loop current generated by an asymmetrical structure, reduces torque fluctuation, has less harmonic waves, reduces noise, has simple arrangement mode, reduces the use of a bus bar and a bus bar, has simple branch and neutral point connection mode of each phase winding, simplifies the manufacturing process, reduces the production cost and improves the processing efficiency.

Alternatively, as shown in fig. 19, 20, 23, and 26, in the fourth to sixth embodiments, the phase winding (U-phase winding or V-phase winding or W-phase winding) is a second connection portion except for 4 first connection portions, and the second connection portion is a connection portion where one welding end of the first U-shaped conductor of one conductor set of the phase and one welding end of the second U-shaped conductor of the other conductor set are connected to each other; specifically, the first second connecting portion is formed by connecting one welding end 303 on the right side of the first U-shaped conductor 400A of the conductor group 400 of the 2 nd and 8 th slots of the stator core and one welding end 303 on the left side of the second U-shaped conductor 400B of the conductor group 400 of the 15 th and 19 th slots of the stator core to each other along the circumferential direction of the stator core 20, and forming a pitch of 7 in the circumferential direction of the stator core, and the second connecting portion is formed by connecting one welding end 303 on the left side of the first U-shaped conductor 400A of the conductor group 400 of the 2 nd and 8 th slots of the stator core and one welding end 303 on the right side of the second U-shaped conductor 400B of the conductor group of the 43 th and 39 th slots of the stator core 20 along the circumferential direction of the stator core and forming a pitch of 7 in the circumferential direction of the stator core; the third second connecting portion is formed by connecting one welding end 303 on the right side of the second U-shaped conductor 400B of the conductor group of the 3 rd and 7 th slots of the stator core 20 and one welding end 303 on the left side of the first U-shaped conductor 400A of the 14 th and 20 th slots of the stator core along the circumferential direction of the stator core and has a pitch of 7 in the circumferential direction of the stator core, the fourth second connecting portion is formed by connecting one welding end 303 on the left side of the second U-shaped conductor 400B of the conductor group 400 of the 3 rd and 7 th slots of the stator core 20 and one welding end 303 on the right side of the first U-shaped conductor 400A of the conductor group of the 44 th and 38 th slots of the stator core along the circumferential direction of the stator core and has a pitch of 7 in the circumferential direction of the stator core, and the fifth second connecting portion is formed by connecting one welding end 303 on the left side of the first U-shaped conductor 400A of the fourth layer of the 26 th and one welding end 303 on the right side of the second U-shaped conductor 400B of the third layer of the 303 are connected to each other and form a pitch of 7 in the circumferential direction of the stator core, and a sixth second connection portion is formed by connecting one welding end 303 positioned on the right side of the first U-shaped conductor 400A of the fifth layer of the 32 th slot of the stator core and one welding end 303 positioned on the left side of the second U-shaped conductor 400B of the sixth layer of the 39 th slot of the stator core to each other in the circumferential direction of the stator core and form a pitch of 7 in the circumferential direction of the stator core; the seventh second connecting portion is formed by connecting one welding end 303 on the left side of the second U-shaped conductor 400B positioned in the fourth layer of the 27 th slot of the stator core 20 in the circumferential direction of the stator core and one welding end 303 on the right side of the first U-shaped conductor 400A positioned in the third layer of the 20 th slot of the stator core with each other and forming a pitch of 7 in the circumferential direction of the stator core, and the eighth second connecting portion is formed by connecting one welding end 303 on the right side of the second U-shaped conductor 400B positioned in the fifth layer of the 31 th slot of the stator core 20 in the circumferential direction of the stator core and one welding end 303 on the left side of the first U-shaped conductor 400A positioned in the sixth layer of the 38 th slot of the stator core with each other and; the winding structure adopts a completely symmetrical structure on a magnetic circuit, eliminates the problem of loop current generated by an asymmetrical structure, reduces torque fluctuation, has less harmonic waves, reduces noise, has simple arrangement mode, reduces the use of a bus bar and a bus bar, has simple branch and neutral point connection mode of each phase winding, simplifies the manufacturing process, reduces the production cost and improves the processing efficiency.

As shown in fig. 7, 8, and 9, in the first to sixth embodiments, the pitch between the two slot interiors 301 of the first U-shaped conductor 400A of each conductor group 400 of the phase windings (U-phase winding, V-phase winding, and W-phase winding) is Y (Y is 6 equal to the full pitch of the pole pitch 6 of the stator winding in the present embodiment), the pitch between the two slot interiors 301 of the second U-shaped conductor 400B is X1 (X1 is 4 smaller than the short pitch of the pole pitch 6 of the stator winding in the present embodiment), and the pitch between the two slot interiors 301 of each third U-shaped conductor 450 of the phase winding is X2 (X2 is 5 smaller than the short pitch of the pole pitch 6 of the stator winding in the present embodiment), that is, the pitch of the two slot interiors 301 of each U-shaped conductor of the phase winding is smaller than or equal to the pole pitch;

further, the pitch 6 between the two slot interiors 301 of the first U-shaped conductor 400A of the conductor set 400 of the phase winding is equal to the full pitch of the pole pitch 6 of the stator winding, the pitch 4 between the two slot interiors 302 of the second U-shaped conductor 400B of the conductor set is smaller than the short pitch of the stator winding, and the difference between the pitch 6 between the two slot interiors of the first U-shaped conductor and the pitch 4 between the two slot interiors of the second U-shaped conductor is 2, and the pitch 5 between the two slot interiors of the third U-shaped conductor of the phase winding is smaller than the short pitch of the stator winding.

Further, as shown in fig. 9, 10A, 10B, 13, 16, 19, 20, 23, and 26, in the first to sixth embodiments, it should be noted that the connection manner of the stator winding welding terminals in the second to sixth embodiments is the same as that of the stator winding welding terminals in the first embodiment, and corresponds to the connection manner in fig. 10B; referring to fig. 10B, in the first to sixth embodiments, the pitch of the two weld ends of any one of the two U-shaped conductors forming the connection to each other in the circumferential direction of the stator core is a long pitch 7. (the pitch between the inside of the groove corresponding to one weld end of one U-shaped conductor and the inside of the groove corresponding to one weld end of the other U-shaped conductor is a long pitch of 7.)

With reference to fig. 1, 2, 10A, and 20, in the first and fourth embodiments, the outgoing line includes lead ends U1, U2, U11, and U12, the outgoing line ends U3, U4, U13, and U14, the lead ends U1 and U2 are located at the radially innermost layer of the stator core, the lead ends U11 and U12 are located at the radially outermost layer of the stator core, the outgoing line ends U3 and U4 are located at the radially outermost layer of the stator core, the outgoing line ends U13 and U14 are located at the radially innermost layer of the stator core, and a side of the outgoing line connected to the neutral point and the phase terminal and a side of the plug end of the conductor are located at the same side of the axial slot of the stator core 26;

with reference to fig. 11 to 16 and 21 to 26, in the second embodiment, the third embodiment, the fifth embodiment and the sixth embodiment, the outgoing line includes lead terminals U1 and U2, lead terminals U3 and U4, lead terminals U1 and U2, and lead terminals U3 and U4 are located at the outermost layer in the radial direction of the stator core; accordingly, they may be located at the radially innermost layers of the stator core.

With reference to fig. 10A, 13 and 16, in the first to third embodiments, two slot interiors of the third U-shaped conductor of the phase winding located in the same radial direction of the outgoing line (incoming line end and outgoing line end) are located outside the radial 2 nd and 3 rd layers, 4 th and 5 th layers, 6 th and 7 th layers of the stator core, and two slot interiors of the first U-shaped conductor and the second U-shaped conductor of the remaining phase winding are located in the radially adjacent 2 nd and 1 st layers, 4 th and 3 rd layers, 6 th and 5 th layers, 8 th and 7 th layers of the stator core;

of course, in the embodiment of the present application, the two slot interiors of the third U-shaped conductor in the same radial direction as the outgoing line are located in the nth layer and the nth-1 layer which are radially adjacent to the stator core, and the third U-shaped conductor in the nth layer and the nth-1 layer may also be located in the remaining circumferential region of the stator winding.

With reference to fig. 20, 23, and 26, in the fourth to sixth embodiments, two of the inside of the third U-shaped conductor of the phase winding located in the same radial direction of the outgoing line (incoming line end, outgoing line end) are located at the 6 th and 7 th layers in the radial direction of the stator core, and two of the inside of the first U-shaped conductor and the second U-shaped conductor are located at the 4 th and 5 th layers, and 6 th and 7 th layers in the radial direction of the stator core, and two of the inside of the first U-shaped conductor and the second U-shaped conductor of the remaining phase winding are located at the 2 nd and 1 st layers, 4 th and 3 rd layers, 6 th and 5 th layers, and 8 th and 7 th layers adjacent to each other in the radial direction of the stator core;

of course, in the embodiment of the present application, the first U-shaped conductor, the second U-shaped conductor, and the third U-shaped conductor in the same radial direction as the outgoing line are located in the nth layer and the nth-1 layer which are radially adjacent to the stator core in the two slot interiors, and the first U-shaped conductor, the second U-shaped conductor, and the third U-shaped conductor in the nth layer and the nth-1 layer may also be located in the remaining circumferential region of the stator winding.

Illustratively, as shown in fig. 27, U-phase conductor lead terminals include U-phase terminals U1, U2, U11 and U12, V-phase conductor lead terminals include V-phase terminals V1, V2, V11 and V12, W-phase conductor lead terminals W1, W2, W11 and W12, U-phase conductor outlet terminals U3, U4, U13 and U14, V-phase conductor outlet terminals V3, V4, V13 and V14, and W-phase conductor outlet terminals W3, W4, W13 and W14 adopt connecting bodies to perform neutral point connection, that is, a 4-branch parallel star connection of the motor is completed; or as shown in fig. 30, using a delta connection; as shown in fig. 28, U-phase conductor lead ends have U-phase terminals U1, U2, V-phase conductor lead ends have V1, V2, W-phase conductor lead ends have W-phase terminals W1, W2, U-phase conductor lead ends U3, U4, V-phase conductor lead ends V3, V4, W-phase conductor lead ends W3, W4 adopt connectors to perform neutral point connection, that is, a 2-branch parallel star connection of the motor is completed; or as shown in fig. 29, using a delta connection;

it should be noted that the difference between the first embodiment of the present application, which is a 4-branch parallel winding, and the second and third embodiments, is that the first embodiment adopts a structure of multiple conductor sets 400 for the 4-branch parallel winding, the second embodiment, which is a 2-branch parallel winding, adopts a structure of multiple conductor sets 400, and the second embodiment, which is located at the radial 8 th layer of the stator core, connects the U-phase conductor outlet ends U3 and U4 and the U-phase conductor inlet ends U11 and U12 in the first embodiment with each other by using a structure of a conductor 500, so as to form the 2-branch parallel winding in the second embodiment; in the third embodiment, the radial 8 th layer of the stator core connects the U-phase conductor outlet ends U3 and U4 and the U-phase conductor inlet ends U11 and U12 in the first embodiment by adopting the structure of the conductor 600, so as to form the 2-branch parallel winding in the third embodiment. Similarly, the difference between the 4-branch parallel winding in the fourth embodiment of the present application and the fifth and sixth embodiments is only that the 4-branch parallel winding in the fourth embodiment adopts a structure of a plurality of conductor sets 400, the parallel winding in the fifth embodiment and the sixth embodiment adopts a structure of a plurality of conductor sets 400, the fifth embodiment is located at the radial 8 th layer of the stator core, and the U-phase conductor outlet ends U3 and U4 in the fourth embodiment and the U-phase conductor inlet ends U11 and U12 in the fourth embodiment are connected by adopting a structure of a conductor 500, so as to form the 2-branch parallel winding in the fifth embodiment; the sixth embodiment is positioned at the radial 8 th layer of the stator core, and the U-phase conductor outlet ends U3 and U4 and the U-phase conductor inlet ends U11 and U12 in the fourth embodiment are connected by adopting the structure of the conductor 600, so that the 2-branch parallel winding in the sixth embodiment is formed.

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

The pole pitch is the number of phases of each winding multiplied by the number of magnetic poles of each group of phase conductors, the coil with the pitch larger than the pole pitch is a long-pitch coil, the coil group with the pitch equal to the pole pitch is a full-pitch coil group, and the coil with the pitch smaller than the pole pitch is a short-pitch coil; specifically, each winding includes 3 sets of phase conductors, the number of slots per phase per pole is 2, and then the pole pitch is 2 × 3 or 6.

The embodiment of the utility model provides a motor includes the motor stator in above-mentioned embodiment, consequently the embodiment of the utility model provides a motor also possesses the beneficial effect that the above-mentioned embodiment described, no longer gives unnecessary details here.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; 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. The above-described meaning of what is specifically intended in the present invention can be understood in specific instances by those of ordinary skill in the art. Finally, it should be noted that the above description is only a preferred embodiment 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, but is capable of various obvious changes, rearrangements and substitutions without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (9)

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;

the method is characterized in that: at least two branch windings in each phase winding are sequentially connected in parallel along the circumferential direction of the stator core;

the phase winding includes:

at least 4 third U-shaped conductors,

a plurality of conductor sets, each of the conductor sets comprising: a first U-shaped conductor and a second U-shaped conductor,

each of the U-shaped conductors includes two slot interiors for insertion into different slots, the two slot interiors of the second U-shaped conductor being within the spacing of the two slot interiors of the first U-shaped conductor;

the pitch between the two inside grooves of the first U-shaped conductor of each conductor group of the phase winding is equal to the pole pitch of the stator winding, the pitch between the two inside grooves of the second U-shaped conductor of each conductor group of the phase winding is smaller than the pole pitch of the stator winding, and the difference between the pitch between the two inside grooves of the first U-shaped conductor and the pitch between the two inside grooves of the second U-shaped conductor is 2; the pitch between the inner parts of the two grooves of the third U-shaped conductor of the phase winding is smaller than the pole pitch of the stator winding;

the phase winding further includes: the two U-shaped conductors are positioned at the connecting part connected outside the axial slot of the stator core,

the connecting portion includes: a first connecting part, a second connecting part,

each of the U-shaped conductors further includes: one end of the stator core positioned outside the axial slots is connected with two welding ends inside the two slots;

the first connecting part is formed by connecting one welding end of each third U-shaped conductor of the phase winding with one welding end of the first U-shaped conductor of one conductor group of the phase winding, and the other welding end of each third U-shaped conductor of the phase winding is connected with one welding end of the second U-shaped conductor of the other conductor group of the phase winding;

the second connecting part is formed by connecting one welding end of a first U-shaped conductor of one conductor group of the phase winding and one welding end of a second U-shaped conductor of the other conductor group of the phase winding with each other.

2. The stator for an electric motor according to claim 1, wherein when the pitch between the inside of two slots of the first U-shaped conductor of each conductor group of said phase winding is equal to the pole pitch of the stator winding, the pitch between the inside of two slots of the second U-shaped conductor of each conductor group of said phase winding is smaller than the pole pitch of the stator winding, and the pitch between the inside of two slots of the third U-shaped conductor of said phase winding is smaller than the pole pitch of the stator winding, the pitch between each of said connecting portions connected at the axially outer ends of the slots of said stator core is a long pitch.

3. The stator according to claim 2, wherein a pitch between two slot interiors of a first U-shaped conductor of said conductor set is 6, a pitch between two slot interiors of a second U-shaped conductor of said conductor set is 4, a pitch between two slot interiors of a third U-shaped conductor of said conductor set is 5, and a pitch between each of said connecting portions connected at an axially outer end of said stator core is 7.

4. The electric machine stator of claim 1, wherein the stator winding further comprises lead-out wires located at the radially outermost layer of the stator core and/or at the radially innermost layer of the stator core, the lead-out wires being located at the other end outside the axial slot of the stator core.

5. An electric machine stator according to claim 1 or 4, wherein the two slot interiors of each U-shaped conductor are located in two radially adjacent layers of the stator core.

6. The motor stator according to claim 4, wherein two slot interiors of each of the U-shaped conductors of the phase windings located in the same radial direction of the lead-out wires are located in an nth layer and an N +1 th layer which are radially adjacent to the stator core, and two slot interiors of the remaining U-shaped conductors of the phase windings are located in an nth layer and an N-1 th layer which are radially adjacent to the stator core, wherein N is an even number equal to or greater than 2.

7. The motor stator according to claim 4, wherein at least one U-shaped conductor located on the nth layer and the N +1 th layer is provided in the remaining circumferential region of the stator core, except for the N +1 th layer and the N-th layer, which are radially adjacent to each other, of the two slots of each U-shaped conductor of the phase winding located in the same radial direction of the outgoing line, where N is an even number equal to or greater than 2.

8. The motor stator according to claim 6 or 7, wherein each of the U-shaped conductors of the phase windings located in the same radial direction as the lead-out wires is a third U-shaped conductor, or each of the U-shaped conductors of the phase windings located in the same radial direction as the lead-out wires is a first U-shaped conductor and a second U-shaped conductor and a third U-shaped conductor.

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

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