CN116418148A

CN116418148A - Motor stator and motor

Info

Publication number: CN116418148A
Application number: CN202310317779.9A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Beijing Hainachuan Automotive Parts Co Ltd
Current assignee: Beijing Hainachuan Automotive Parts Co Ltd
Priority date: 2023-03-27
Filing date: 2023-03-27
Publication date: 2023-07-11

Abstract

The invention discloses a motor stator and a motor, wherein the motor stator comprises a stator core and a stator winding, a plurality of stator grooves which are axially penetrated are uniformly formed in the inner wall of the stator core along the circumferential direction, the number of grooves of each pole is 4, the stator winding comprises a plurality of flat wires which are inserted into the stator grooves, the flat wires in one phase can be sequentially connected through the turning of the flat wires inserted into the innermost layer and the outermost layer so as to form one or more annular loops in one phase, at least one breakpoint exists on any annular loop, the pins of the flat wires on the two sides of the breakpoint respectively form the starting point or the ending point of any parallel branch in each phase winding, the connection mode of the stator winding of the motor stator is wide in application range, the sum of the distribution of each branch in each pole is equal, the electric potential sum of each branch is ensured, and the generation of circulation is avoided.

Description

Motor stator and motor

Technical Field

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

Background

In the prior art, in order to realize higher power torque density, a flat copper coil with higher slot filling rate is selected as a stator winding of a vehicle driving motor, and because flat copper wires are formed windings, when the stator winding adopts different parallel branch numbers, the stator winding needs to adopt different arrangement modes, the design process is complex, and an improvement space exists.

Disclosure of Invention

The present invention aims to solve, at least to some extent, one of the above technical problems in the prior art. Therefore, the invention provides a motor stator, the connection mode of the stator winding of the motor stator has wide application range, and the sum of the distribution of each branch at each pole is equal, so that the electric potential sum of each branch is ensured to be equal, and the generation of circulation is avoided.

The invention also provides a motor with the motor stator.

The motor stator according to the embodiment of the invention comprises a stator core and a stator winding, wherein the stator core is provided with a plurality of stator slots which are distributed in the circumferential direction, each adjacent four stator slots form a stator slot group, the ratio of the number of slots of the stator slots to the number of poles of the motor which are arranged on the stator core is Y, the motor stator is characterized in that the stator winding comprises M phases, each phase winding occupies one stator slot group, each corresponding 2P stator slot groups, the stator winding penetrates through a plurality of stator slots along the circumferential direction of the stator core and forms a 2N conductor layer along the radial direction of the stator core, each corresponding stator slot group is arranged along a first direction, the stator slots in each stator slot group are arranged along the first direction,

The stator winding includes a plurality of inserts locate the flat wire in the stator groove, the flat wire has two pins, the pin has imperial crown end and welding end, one the flat wire two the imperial crown end of pin is connected, the flat wire can divide into:

the two pins of the first flat wire are inserted into the 2k layer conductor layer and the 2k+1 layer conductor layer of the stator slot, and the pitch of the first flat wire is Y;

the two pins of the second flat wire are inserted into the 2N layer conductor layer position of the stator slot at the same time, and are respectively inserted into the 2b stator slot group and the 2b-1 stator slot group of the same phase, and the pitch of the second flat wire is Y;

a third flat wire and a fourth flat wire, wherein two pins of the third flat wire and the fourth flat wire are inserted into the 1 st conductor layer of the stator slot,

the two pins of the third flat wire are respectively inserted into the 1 st stator slot of the 2b stator slot group and the 4 th stator slot of the 2b-1 stator slot group of the same phase, the pitch of the third flat wire is Y-3, the two pins of the fourth flat wire are respectively inserted into the m-th slot of the 2b stator slot group and the m-1 slot of the 2b-1 stator slot group, the pitch of the fourth flat wire is Y+1, or the two pins of the third flat wire are respectively inserted into the 4 th stator slot of the 2b stator slot group and the 1 st stator slot of the 2b-1 stator slot group of the same phase, the pitch of the third flat wire is Y+3, the two pins of the fourth flat wire are respectively inserted into the m-th slot of the 2b stator slot group and the m+1 slot of the 2b-1 stator slot group, the pitch of the fourth flat wire is Y-1,

The welding ends of pins of the 2k-1 layer conductor layers of the m stator slots of the a stator slot group are inserted into the same phase of one flat wire, the welding ends of pins of the 2k layer conductor layers of the m stator slots of the a stator slot group are connected with the welding ends of pins of the 2k layer conductor layers of the m stator slots of the a+1 stator slot group of the other flat wire, so that one corresponding flat wire is sequentially connected to form one or more annular loops which are connected end to end, at least one breakpoint exists outside the pins of the flat wire on any annular loop, the annular loop is formed into at least one branch, the pins on two sides of the breakpoint respectively form the starting point or the ending point of any branch in each phase winding, M, N, P, a, b, m, k is an integer, and m is less than or equal to 4, and k is less than or equal to N.

According to the motor stator provided by the embodiment of the invention, the connection mode of the stator winding of the motor stator is wide in application range, the sum of the distribution of each branch at each pole is equal, the electric potential sum of each branch is ensured to be equal, and the generation of circulation is avoided.

In addition, the motor stator according to the embodiment of the invention can also have the following additional technical characteristics:

according to some embodiments of the invention, there are P break points in each phase winding, P branches are formed, and the lead-in ends or lead-out ends of the branches are formed on the pins on two sides of the break points.

According to some embodiments of the present invention, the lead-in end and the lead-out end of the P branches are located at the crown end of the pin of the flat wire or the welding end of the pin of the flat wire, the pins corresponding to the lead-in ends of the P branches are located at the same conductor layer, the pins corresponding to the lead-out ends of the P branches are located at the same conductor layer, and the spans between any two adjacent break points are the same in the circumferential direction of the stator core.

According to some embodiments of the invention, the P is singular, and each phase winding comprises a loop connected end to end, and the loop has at least one break point.

According to some embodiments of the invention, P is a double number and not a multiple of 4, each phase winding comprises two endless loops connected end to end and having equal length, the endless loops have at least one break point, and the number of break points on the two endless loops is the same.

According to some embodiments of the invention, P is a multiple of 4, and each phase winding includes four endless loops of equal length connected end to end, each endless loop having at least one break point, and the number of break points on the four endless loops is the same.

According to some embodiments of the invention, each phase winding comprises a plurality of branches, and the branches can be connected in series or parallel, or the branches can be connected in parallel after being connected in series.

According to some embodiments of the invention, the flat wire comprises: two pins, which are used for being inserted into the stator slots to form the conductor layer; the crown part is connected between the two pins and is in an outward convex shape; and one end of the pin, which is far away from the crown part, forms a welding part.

According to some embodiments of the invention, the pins on both sides of the break point are formed with a lead-in or a lead-out of the branch.

A motor according to another aspect of the invention comprises a motor stator as described above.

Drawings

Fig. 1 is a schematic arrangement of stator windings according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a third flat wire and a fourth flat wire according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a first flat wire according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a second flat wire according to an embodiment of the present invention;

FIG. 5 is a schematic illustration of an arrangement of stator windings according to an embodiment of the present invention;

fig. 6 is a schematic diagram of an arrangement of stator windings according to an embodiment of the present invention;

fig. 7 is a schematic diagram of an arrangement of stator windings according to an embodiment of the present invention;

fig. 8 is a schematic diagram of an arrangement of stator windings according to an embodiment of the present invention;

Fig. 9 is a schematic diagram of an arrangement of stator windings according to an embodiment of the present invention;

fig. 10 is a schematic diagram of an arrangement of stator windings according to an embodiment of the present invention;

fig. 11 is a schematic diagram of an arrangement of stator windings according to an embodiment of the present invention.

Reference numerals:

a first flat wire 10, a second flat wire 20, a third flat wire 30, a fourth flat wire 40, a pin 1, a welding part 11 and a crown part 2.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the prior art, in order to realize higher power torque density, a stator winding of a vehicle is a flat copper coil with higher slot filling rate, and because the flat copper coil is a forming winding, when each phase of the stator winding adopts different parallel branch numbers, the stator winding needs to adopt different arrangement modes, and the design process is complex.

Therefore, the embodiment of the invention designs the arrangement mode of the stator winding with wider application range while ensuring that the sum of the distribution of each branch at each pole is equal, thereby simplifying the design process of the driving motor on the arrangement mode of the stator winding, reducing the design cost, ensuring the electric potential sum of each branch and avoiding the generation of circulation because the sum of the distribution of each branch at each pole is equal.

An electric motor stator according to an embodiment of the present invention is described below with reference to fig. 1 to 11.

The motor stator according to an embodiment of the present invention may include: stator core and stator winding.

Further, the stator core has a plurality of stator slots arranged in the circumferential direction thereof, and each adjacent four stator slots constitute a stator slot group, and each pole of each phase winding occupies one stator slot group, that is, the number of slots per pole of each phase of the motor stator is 4.

The stator winding includes M phases, any one of which corresponds to 2P stator slot groups, in other words, one phase of the stator winding has P pairs of electrodes. The ratio of the number of stator slots formed in the stator core to the number of poles of the motor is Y, and the stator winding penetrates through the stator slots along the circumferential direction of the stator core and forms 2N conductor layers along the radial direction of the stator core.

Each corresponding stator slot group is arranged in A first direction, which may be A clockwise direction (O-A direction as shown in fig. 1) or A counterclockwise direction (O-B direction as shown in fig. 1), and the stator slots in each stator slot group are arranged in the first direction, which are first, second, third and fourth slots, respectively.

The stator winding comprises a plurality of flat wires inserted in stator slots of the stator core, each flat wire comprises two connected pins 1, each flat wire is shaped like a U, each pin 1 of each flat wire is provided with a crown end and a welding end, the crown ends of the two pins of one flat wire are connected, in other words, one end of each pin 1, which is connected with each other, is a crown end, and the other end of each pin is a welding end.

Further, the flat wires may be divided into a first flat wire 10, a second flat wire 20, a third flat wire 30, and a fourth flat wire 40.

The two pins 1 of the first flat wire 10 are respectively inserted into the 2k layer conductor layer and the 2k+1 layer conductor layer of the stator slot, the pitch of the first flat wire 10 is Y, and the welding end of the pin 1 of the 2k-1 layer conductor layer of the m stator slot of the a stator slot group inserted by one flat wire in the same phase is connected with the welding end of the pin 1 of the 2k layer conductor layer of the m stator slot of the a+1 stator slot group inserted by the other flat wire.

Thus, after all the first flat wires 10 are connected to each other, 8P parallel and disjoint coil units are formed in one phase, the coil units extend from the 2 nd layer conductor layer in the stator slot to the 2N-1 layer conductor layer in the stator slot, wherein the pin 1 of the first flat wire 10 positioned in the 2 nd layer conductor layer in each stator slot is formed as a first end of the coil unit, and the pin 1 of the first flat wire 10 positioned in the 2 nd layer conductor layer in each stator slot is formed as a second end of the coil unit.

Further, the two pins 1 of the second flat wire 20 are simultaneously inserted into the 2N-th layer of conductor layer of the stator slot, and the two pins 1 are respectively inserted into the 2 b-th stator slot group and the 2 b-1-th stator slot group of the same phase, the pitch of the second flat wire 20 is Y, and the welding end of the pin 1 of the 2 k-1-th layer of conductor layer of the m-th stator slot of the a-th stator slot group inserted into the same phase of one flat wire is connected with the welding end of the pin 1 of the 2 k-th layer of conductor layer of the m-th stator slot of the a+1-th stator slot group inserted into the other flat wire.

Thus, the series connection is achieved between two coil units of the 2N-1 layer conductor layer of the same ordered stator slot in the adjacent two stator slot groups by the second flat wire 20.

That is, after all the first flat wires 10 and the second flat wires 20 are connected to each other, 4P short branches are formed in one phase, and the short branches extend from the 2 nd layer of conductor layer in the stator slot to the 2N-1 layer of conductor layer in the stator slot, pass through the second flat wires 20 positioned on the 2N layer of conductor layer, turn around from the 2N-1 layer of conductor layer in the stator slot to the 2 nd layer of conductor layer. The pin 1 of the first flat wire 10 inserted in the 2 nd layer of conductor layer of the c-th stator slot in the 2b+1 stator slot group is formed as a first end of one short branch, and the pin 1 of the first flat wire 10 inserted in the 2 nd layer of conductor layer of the c-th stator slot in the 2b+2 stator slot group is formed as a second end of the short branch.

Still further, the two pins 1 of the third flat wire 30 and the fourth flat wire 40 are simultaneously inserted into the 1 st layer of conductor layer of the stator slot, wherein the two pins 1 of the third flat wire 30 are respectively located in the fourth slot of the 2 b-th stator slot group and the first slot of the 2b-1 nd stator slot group in the same phase, and the pitch of the third flat wire 30 is y+3.

And, since the welding end of the pin 1 of the 2k-1 th layer conductor layer of the m-th stator slot of the a-th stator slot group of one flat wire positioned in phase is connected with the welding end of the pin 1 of the 2 k-th layer conductor layer of the m-th stator slot of the a+1-th stator slot group of the other flat wire, the third flat wire 30 connects the short branch of the 2 nd layer conductor layer of the fourth slot positioned in the 2b+1-th stator slot group with the short branch of the 2 nd layer conductor layer of the first slot positioned in the 2 b-th stator slot group at the second end in series.

The two pins 1 of the fourth flat wire 40 are respectively positioned in the m-th slot of the 2b-th stator slot group and the m+1-th slot of the 2b-1-th stator slot group, the pitch of the fourth flat wire 40 is Y-1, and the welding end of the pin 1 of the 2k-1 th layer conductor layer of one flat wire positioned in the m-th stator slot of the a-th stator slot group is connected with the welding end of the pin 1 of the 2 k-th layer conductor layer of the other flat wire positioned in the m-th stator slot of the a+1-th stator slot group.

Thus, one fourth flat wire 40 connects in series the short leg of the 2 nd layer conductor layer of the first slot in the 2b+1 stator slot group with the short leg of the 2 nd layer conductor layer of the second slot in the 2b stator slot group at the second end, the other fourth flat wire 40 connects in series the short leg of the 2 nd layer conductor layer of the second slot in the 2b+1 stator slot group at the first end with the short leg of the 2 nd layer conductor layer of the third slot in the 2b stator slot group at the second end, and the further fourth flat wire 40 connects in series the short leg of the 2 nd layer conductor layer of the third slot in the 2b+1 stator slot group at the first end with the short leg of the 2 nd layer conductor layer of the fourth slot in the 2b stator slot group at the second end. Thus, the third flat wire 30 and the fourth flat wire 40 sequentially connect the 4P disjoint short branches formed in one phase, so that they form one endless loop, two endless loops, or four endless loops.

Or, the two pins 1 of the third flat wire 30 are respectively inserted into the first slot of the 2 b-th stator slot group and the fourth slot of the 2b-1 nd stator slot group in the same phase, the pitch of the third flat wire 30 is Y-3, and the welding end of the pin 1 of the 2k-1 th layer conductor layer of the m-th stator slot of the a-th stator slot group inserted into one flat wire in the same phase is connected with the welding end of the pin 1 of the 2 k-th layer conductor layer of the m-th stator slot of the a+1-th stator slot group inserted into the other flat wire. Thus, the third flat wire 30 connects in series the short leg of the 2 nd layer conductor layer of the first slot in the 2b+1 th stator slot group with the short leg of the 2 nd layer conductor layer of the fourth slot in the 2b th stator slot group at the first end.

The two pins 1 of the fourth flat wire 40 are respectively positioned in the m-1 slot of the m-th slot of the 2 b-th stator slot group and the m-1 slot of the 2b-1 th stator slot group, the pitch of the fourth flat wire 40 is Y+1, and the welding end of the pin 1 of the 2k-1 th layer conductor layer of the m-th stator slot of the a-th stator slot group inserted by one flat wire positioned in the same phase is connected with the welding end of the pin 1 of the 2 k-th layer conductor layer of the m-th stator slot of the a+1-th stator slot group inserted by the other flat wire.

Thus, one fourth flat wire 40 connects in series the short leg of the 2 nd layer conductor layer of the second slot in the 2b+1 stator slot group with the short leg of the 2 nd layer conductor layer of the first slot in the 2b stator slot group at the second end, the other fourth flat wire 40 connects in series the short leg of the 2 nd layer conductor layer of the third slot in the 2b+1 stator slot group at the first end with the short leg of the 2 nd layer conductor layer of the second slot in the 2b+2 stator slot group at the second end, and the other fourth flat wire 40 connects in series the short leg of the 2 nd layer conductor layer of the fourth slot in the 2b+1 stator slot group at the first end with the short leg of the 2 nd layer conductor layer of the third slot in the 2b+2 stator slot group at the second end. Thus, the third flat wire 30 and the fourth flat wire 40 sequentially connect the corresponding plurality of short branches in series, such that they form an endless loop, two endless loops, or four endless loops.

Through the arrangement mode, one or more annular loops connected end to end are formed by sequentially connecting corresponding flat wires, at least one breakpoint exists outside a pin of each flat wire on any annular loop, the annular loop is formed into at least one branch, and the pins on two sides of the breakpoint respectively form a starting point or an ending point of any branch in each phase of winding.

The break points can be formed at the welding ends of the pins of the flat wire or at the crown ends of the pins of the flat wire at the same time. Further, when there are a plurality of break points on one loop, the distances between adjacent two break points in the winding direction are equidistant.

M, N, P, a, b, m, k is an integer, m is less than or equal to 4, and k is less than or equal to N.

According to the motor stator provided by the embodiment of the invention, the connection mode of the stator winding of the motor stator has a wide application range, and the sum of the distribution of each branch at each pole is equal, so that the electric potential sum of each branch is ensured to be equal, and the generation of circulation is avoided.

According to some embodiments of the invention, P is singular and each phase winding comprises a loop connected end to end, the loop having at least one break point.

According to other embodiments of the invention, P is a double number and not a multiple of 4, each phase winding comprises two endless loops of equal length connected end to end, the endless loops having at least one break point, the number of break points on the two endless loops being the same.

According to still other embodiments of the invention, P is a multiple of 4, each phase winding comprising four endless loops of equal length connected end to end, the endless loops having at least one break point, the number of break points on the four endless loops being the same.

Specifically, when P is a multiple of 4, the flat wires in one phase form 4 endless loops connected end to end in the above arrangement, when P is a multiple of 2 and is not a multiple of 4, the flat wires in one phase form 2 endless loops connected end to end in the above arrangement, and when P is singular, the flat wires in one phase form 1 endless loop connected end to end in the above arrangement.

In some embodiments, when P is a multiple of 4, the flat wires in one phase form 4 end-to-end annular loops in the above arrangement, each phase includes 8n×p flat wires, each annular loop includes 2n×p flat wires, x break points exist on the annular loop, x is a divisor of 2n×p, the x break points divide the 4 end-to-end annular loops into 4x identical branches, and the x break points are equidistant in the winding direction.

In other embodiments, when P is a multiple of 2 and is not a multiple of 4, the flat wires in one phase form 2 endless loops in the above arrangement, each phase includes 8n×p flat wires, each loop includes 4n×p flat wires, y break points exist on the loop, y is a divisor of 4n×p, y break points divide the 2 endless loops into 2y identical branches, and y break points are equidistant in the winding direction.

In still other embodiments, when P is singular, the flat wires in one phase form 1 endless loop in the arrangement described above, the endless loop comprising 8n×p flat wires, there being z break points on the endless loop, z being a divisor of 8n×p, the z break points dividing the 1 endless loop into z identical branches, the z break points being equidistant in the winding direction. x, y and z are integers.

For example, when p=4 and n=3, by the arrangement of the flat wires, each phase winding forms 4 endless loops connected end to end. The loop comprises 24 consecutive flat wires, 24 having 8 common divisors comprising 1, 24, 2, 12, 3, 8, 4, 6, so that there may be 1 break point on one loop, four branches per phase winding, two breaks on one loop, eight branches per phase winding, or 3 breaks on one loop, 12 branches per phase winding, etc.

For example, when p=6 and n=3, by the arrangement of the flat wires, each phase winding forms 2 endless loops connected end to end. The loop comprises 72 sequentially connected flat wires, 72 having 12 common divisors comprising 1, 72, 2, 36, 3, 24, 4, 18, 6, 12, 8, 9, so that there may be 1 break point on one loop, 2 branches per phase winding, two break points on one loop, 4 branches per phase winding, or 3 break points on one loop, 6 branches per phase winding, or 6 break points on one loop, 12 branches per phase winding, 8 break points on one loop, 16 branches per phase winding, etc.

For example, when p=7 and n=3, by the arrangement of the flat wires, each phase winding forms 1 endless loop connected end to end. The loop circuit includes 168 sequentially connected flat wires, 168 has 16 common divisors including 1, 168, 2, 84, 3, 56, 4, 42, 6, 28, 7, 24, 8, 21, 12, 14, so that 1 break point may be formed into one branch, two break points may be formed into two branches, 3 break points may be formed into 3 branches, 4 break points may be formed into 4 branches, 6 break points may be formed into 6 branches, or 7 break points may be formed into 7 branches, 8 break points may be formed into 8 branches, 12 break points may be formed into 12 branches, etc. on the loop circuit.

For example, when p=3 and n=3, by the arrangement of the flat wires, each phase winding forms 1 endless loop connected end to end. The loop comprises 72 sequentially connected flat wires, 72 has 12 common divisors comprising 1, 72, 2, 36, 3, 24, 4, 18, 6, 12, 8, 9, so that there may be 1 break point forming one branch, two break points forming two branches, or 3 break points forming 3 branches, 4 break points forming 4 branches, 6 break points forming 6 branches, 8 break points forming 8 branches, 9 break points forming 9 branches, etc. on the loop.

In some embodiments, there may be 3 breaks in the loop, forming 3 branches, each branch comprising 24 consecutive flat wires.

For example, the crown ends of the pins of the flat wire inserted in the 1 st layer conductor layer of the 1 st stator slot of the 2 nd stator slot group and the 3 rd layer conductor layer of the 1 st stator slot of the 3 rd stator slot group may be disconnected to form a first break point, the crown ends of the pins of the flat wire inserted in the 1 st layer conductor layer of the 1 st stator slot of the 4 th stator slot group and the 3 rd layer conductor layer of the 1 st stator slot of the 5 th stator slot group may be disconnected to form a second break point, and the crown ends of the pins of the flat wire inserted in the 2 nd layer conductor layer of the 1 st stator slot of the 6 th stator slot group and the 3 rd layer conductor layer of the 1 st stator slot group may be disconnected to form a third break point.

Thus, the phase forms three branches, namely, the first branch with the start point at the crown end of the pin 1 inserted in the 3 rd layer conductor layer of the 1 st stator slot of the 3 rd stator slot group, the first branch with the end point at the crown end of the pin 1 inserted in the 2 nd layer conductor layer of the 1 st stator slot of the 6 th stator slot group, the first branch with the start point at the crown end of the pin 1 inserted in the 3 rd layer conductor layer of the 1 st stator slot of the 5 th stator slot group, the second branch with the end point at the crown end of the pin 1 inserted in the 2 nd layer conductor layer of the 1 st stator slot of the 2 nd stator slot group, the first branch with the start point at the crown end of the pin 1 inserted in the 3 rd layer conductor layer of the 1 st stator slot of the 1 th stator slot group, and the third branch with the end point at the crown end of the pin 1 inserted in the 2 nd layer conductor layer of the 1 st stator slot of the 4 th stator slot group.

For example, a first break point may be formed by breaking a welded end of the pin 1 inserted in the 1 st stator slot of the 2 nd stator slot group from a welded end of the pin 1 inserted in the 1 st stator slot of the 1 st stator slot group by another flat wire, a second break point may be formed by breaking a welded end of the pin 1 inserted in the 1 st stator slot of the 4 th stator slot group from a welded end of the pin 1 inserted in the 1 st stator slot of the 3 rd stator slot group by another flat wire, and a third break point may be formed by breaking a welded end of the pin 1 inserted in the 1 st stator slot of the 6 th stator slot group from a welded end of the pin 1 inserted in the 1 st stator slot of the 5 th stator slot group by another flat wire.

Thus, the phase forms three branches, namely, a first branch whose starting point is positioned at the welding end of the pin 1 inserted in the 2 nd layer conductor layer of the 1 st stator slot of the 2 nd stator slot group, whose ending point is positioned at the first branch of the welding end of the pin 1 of the 1 st layer conductor layer of the 1 st stator slot of the 5 th stator slot group, whose starting point is positioned at the welding end of the pin 1 inserted in the 2 nd layer conductor layer of the 1 st stator slot of the 4 th stator slot group, whose ending point is positioned at the second branch of the welding end of the pin 1 inserted in the 1 st layer conductor layer of the 1 st stator slot group, whose starting point is positioned at the welding end of the pin 1 inserted in the 2 nd layer conductor layer of the 1 st stator slot of the 6 th stator slot group, and whose ending point is positioned at the third branch of the welding end of the pin 1 inserted in the 1 st layer conductor layer of the 1 st stator slot of the 3 rd stator slot group.

There are also various locations in the loop where breakpoints exist, not limited herein.

Through the arrangement mode of the stator windings, the stator windings can be suitable for the situation that the number of slots of each phase of each pole is 4, the number of branches is 3 and the like, and the stator windings are not easy to arrange.

According to some embodiments of the invention, there are P breaks in each phase winding, each phase winding being formed with P branches, the number of breaks being the same as the number of branches. Therefore, whether each phase winding forms 1 annular loop, two annular loops or four annular loops, the break point at the P position can divide one or more annular loops into P equal-length branches.

If there are multiple break points on each loop, the break points on each loop may not be correlated, with equal distances between the break points in the winding direction.

The pins at two sides of the break point are provided with leading-in ends or leading-out ends of the branches. Since the pins at two sides of the break point can form the lead-in end or the lead-out end of any branch in each phase winding, when only one break point exists on one annular loop, the pins at two sides of the break point can form the lead-in end and the lead-out end of one branch, and when a plurality of break points exist on one annular loop, the two pins at two sides of the break point can respectively form the lead-in end of one branch and the lead-out end of the other branch.

The leading-in ends and the leading-out ends of the P branches are simultaneously positioned at the crown ends of the pins of the flat wire or the welding ends of the pins of the flat wire, so that the leading-in ends and the leading-out ends of the branches of each phase winding are positioned in the same direction, and the mutual connection among the branches is facilitated.

And the pins corresponding to the leading-in ends of the P branches are positioned on the same conductor layer, the pins corresponding to the leading-out ends of the P branches are also positioned on the same conductor layer, so that the sum of the distribution of each branch at each pole is ensured to be equal, the electric potential sum of each branch is ensured to be equal, the generation of circulation is avoided, the distribution position rule of each branch is ensured, and the leading-in ends and the leading-out ends of each branch are conveniently connected with each other.

In some embodiments, the pins corresponding to the lead-in and lead-out ends of the P branches are located in the same conductor layer, and at this time, the breakpoint is located at the crown end of the pin of the flat wire of the first conductor layer or the crown end of the pin of the flat wire of the 2N-th layer conductor layer.

In the circumferential direction of the stator core, the spans between any two adjacent break points are the same. The ratio of the number of stator slots formed in the stator core to the number of poles of the motor is Y, and the span between any two adjacent break points is 2Y, so that the positions of the leading-in ends of all the branches are regular and positioned on the same conductor layer, and the connection between all the branches is facilitated.

For example, when the first break point is located between the pin of the 3 rd layer conductor layer of the 1 st stator slot group and the pin of the 4 th layer conductor layer of the 1 st stator slot of the 2 nd stator slot group, the 2 nd break point is located between the pin of the 3 rd layer conductor layer of the 1 st stator slot of the 3 rd stator slot group and the pin of the 4 th layer conductor layer of the 1 st stator slot of the 4 th stator slot group, and the v break point is located between the pin of the 3 rd layer conductor layer of the 1 st stator slot of the 2v-1 stator slot group and the pin of the 4 th layer conductor layer of the 1 st stator slot of the 2v stator slot group.

In some embodiments, the stator winding forms 2P layers of conductor layers along the radial direction of the stator core, thereby enabling the overall structure of the stator winding to be more regular.

Referring to fig. 2 to 4, the flat wire includes: the two pins 1 and the crown 2, the pins 1 are used for being inserted into the stator slots to form conductor layers, the crown 2 is connected between the two pins 1, the crown 2 is in an outer convex shape, and the outer convex crown 2 can facilitate arrangement and installation of flat wires. One end of the pin 1 far away from the crown 2 forms a welding part 11, the welding part 11 is positioned at the welding end of the pin of the flat wire, and the crown 2 is positioned at the crown end of the pin of the flat wire.

Further, the lead-in ends or the lead-out ends of the branches are formed on the pins 1 at both sides of the break point, that is, when the break point is formed at the crown ends of the two pins 1 of the same flat wire, the crown ends of the two pins 1 are formed as the lead-in ends or the lead-out ends of the branches, and the crown parts 2 are not arranged between the two pins 1 and are not connected with each other. Further, when the break point is formed at the welded ends of the adjacent two pins 1 of the adjacent two flat wires in the winding direction, the ends of the corresponding two pins 1 distant from the crown 2 are not formed with the welded portions 11 and are not welded to each other, but are formed as the lead-in ends or the lead-out ends of the branches.

According to some embodiments of the present invention, the crown 2 of each flat wire of the stator winding is located at one side of the outer end of the stator slot of the stator core, and the welding portion 11 is located at the other side of the outer end of the stator slot, so that the overall structure of the stator winding is more regular, and the installation and welding of the stator winding are facilitated.

Referring to fig. 3, the welding parts 11 of the first flat wire 10 at both sides extend obliquely in a direction away from each other in the extending direction of the pin 1 so that the welding part 11 at one side is welded with the welding parts 11 of the pins 1 in the stator slot group adjacent to the one side.

As shown in fig. 4, the welding portions 11 of the second flat wire 20 on both sides extend obliquely in a second direction opposite to the first direction in the extending direction of the pin 1, so that the stator winding can be turned in the second direction by the second flat wire 20.

As shown in fig. 2, the welded portions 11 of the third and fourth

flat wires

30 and 40 on both sides extend obliquely in the first direction in the extending direction of the pin 1 so that the stator winding can be turned in the first direction by the third and fourth

flat wires

30 and 40.

In some embodiments, two flat wires adjacent in the winding direction are welded to each other by a weld 11 to facilitate the installation of the stator winding.

According to some embodiments of the present invention, the multiple branches included in each phase winding may be connected in series or parallel, or the multiple branches may be connected in parallel after being connected in series, so as to make the arrangement of the stator winding more universal.

For example, when p=4 and n=3, by the arrangement of the flat wires, each phase winding forms 4 endless loops connected end to end. There may be 3 break points on one toroidal loop, 12 branches per phase winding.

The 12 branches formed in the above manner may be connected in series and then connected in parallel, for example, any four branches of the 12 branches are connected in series, and 3 serial branches are formed in a conformal manner. For example, any 6 of the 12 branches are connected in series, and 2 serial branches are formed. Through the mutual series connection among the branches, each phase of winding can form branches with different numbers, so that the arrangement mode has more practicability.

According to some embodiments of the present invention, as shown in fig. 1, the stator winding includes 3 phases, each corresponding to 6 stator slot groups, each phase winding includes 3 branches, and by the arrangement manner of the stator windings, one phase and three branches can be realized under the condition that the slot number of each phase of each pole is 4.

In fig. 5 to 11, each row represents a conductor layer, each column represents a stator slot, the front of "-" represents a branch number, and the rear of "-" represents a flat wire coil number. Further, in fig. 1, the first row represents a first conductor layer in the stator slot, the second row represents a second conductor layer and a third conductor layer in the stator slot, the third row represents a fourth conductor layer and a fifth conductor layer in the stator slot, and the fourth row represents a sixth conductor layer.

A specific embodiment of the present invention is described with reference to fig. 1 and 5.

As shown in fig. 1 and 5, the stator winding comprises 3 phases, each corresponding 6 stator slot groups, each pole has 4 slots per phase, each phase winding comprises 3 branches, and the stator winding forms 6 conductor layers along the radial direction of the stator core. Wherein the pitch of the third flat wire 30 is y+3 and the pitch of the fourth flat wire is Y-1.

Through the arrangement mode of the flat wires, each phase of winding forms 1 annular loop connected end to end. The loop comprises 72 flat wires connected in sequence, on which there are 3 break points, so that it forms 3 branches. Wherein each branch comprises 24 flat wires.

The welding ends of the pins of the first layer of conductor layer inserted in the first stator slot group are not connected with the welding ends of the pins of the second layer of conductor layer inserted in the first stator slot group, so that break points are generated between the two pins, wherein the welding ends of the pins of the first layer of conductor layer inserted in the first stator slot group are formed into the leading-out ends of the second branch, and the welding ends of the pins of the second layer of conductor layer inserted in the first stator slot group are formed into the leading-in ends of the first branch.

Further, the welding end of the pin of the first layer of conductor layer inserted in the first stator slot in the third stator slot group is not connected with the welding end of the pin of the second layer of conductor layer inserted in the first stator slot in the fourth stator slot group, so that a break point is generated between the two pins, wherein the welding end of the pin of the first layer of conductor layer inserted in the first stator slot in the third stator slot group is formed as the leading-out end of the third branch, and the welding end of the pin of the second layer of conductor layer inserted in the first stator slot in the fourth stator slot group is formed as the leading-in end of the second branch.

Still further, the welding end of the pin of the first layer of conductor layer inserted in the first stator slot in the fifth stator slot group is not connected with the welding end of the pin of the second layer of conductor layer inserted in the first stator slot in the sixth stator slot group, so that a break point is generated between the two pins, wherein the welding end of the pin of the first layer of conductor layer inserted in the first stator slot in the fifth stator slot group is formed as the leading-out end of the first branch, and the welding end of the pin of the second layer of conductor layer inserted in the first stator slot in the sixth stator slot group is formed as the leading-in end of the third branch.

Another embodiment of the present invention is described with reference to fig. 6.

As shown in fig. 6, the stator winding comprises 3 phases, each corresponding 6 stator slot groups, each pole has 4 slots per phase, each phase winding comprises 3 branches, and the stator winding forms 8 conductor layers along the radial direction of the stator core. Wherein the pitch of the third flat wire 30 is y+3 and the pitch of the fourth flat wire is Y-1.

Through the arrangement mode of the flat wires, each phase of winding forms 1 annular loop connected end to end. The loop comprises 96 flat wires connected in sequence, and 3 break points exist on the loop, so that the loop forms 3 branches. Wherein each branch comprises 32 flat wires.

Another embodiment of the present invention is described with reference to fig. 7.

As shown in fig. 7, the stator winding comprises 3 phases, each corresponding 6 stator slot groups, each pole has 4 slots per phase, each phase winding comprises 3 branches, and the stator winding forms 4 conductor layers along the radial direction of the stator core. Wherein the pitch of the third flat wire 30 is y+3 and the pitch of the fourth flat wire is Y-1.

Through the arrangement mode of the flat wires, each phase of winding forms 1 annular loop connected end to end. The loop comprises 48 flat wires connected in sequence, and 3 break points exist on the loop, so that the loop forms 3 branches. Wherein each branch comprises 16 flat wires.

The two-side pins are respectively inserted into the second layer conductor layer of the first stator slot in the second stator slot group and the crown end of the pin of the first flat wire of the third layer conductor layer of the first stator slot in the third stator slot group to generate a first breakpoint between the two pins, wherein the crown end of the pin of the second layer conductor layer inserted into the first stator slot in the second stator slot group is formed as a leading-out end of the second branch, and the crown end of the pin of the third layer conductor layer inserted into the first stator slot in the three stator slot groups is formed as a leading-in end of the first branch.

Further, the two-side pins are respectively inserted into the second layer conductor layer of the first stator slot in the fourth stator slot group and the crown end of the pin of the first flat wire of the third layer conductor layer of the first stator slot in the fifth stator slot group to generate a second breakpoint between the two pins, wherein the crown end of the pin of the second layer conductor layer inserted into the first stator slot in the fourth stator slot group is formed as the leading-out end of the third branch, and the crown end of the pin of the third layer conductor layer inserted into the first stator slot in the five stator slot groups is formed as the leading-in end of the second branch.

Still further, the second layer conductor layer of the first stator slot in the sixth stator slot group and the crown end of the first flat wire of the third layer conductor layer of the first stator slot in the first stator slot group are respectively inserted into the pins at two sides so as to generate a third breakpoint between the two pins, wherein the crown end of the pin of the second layer conductor layer of the first stator slot in the sixth stator slot group is formed as the leading-out end of the first branch, and the crown end of the pin of the third layer conductor layer of the first stator slot in one stator slot group is formed as the leading-in end of the third branch.

A specific embodiment of the present invention is described with reference to fig. 8.

As shown in fig. 8, the stator winding comprises 3 phases, each corresponding 4 stator slot groups, each pole has 4 slots per phase, each phase winding comprises 2 branches, and the stator winding forms 8 conductor layers along the radial direction of the stator core. Wherein the pitch of the third flat wire 30 is y+3 and the pitch of the fourth flat wire is Y-1.

Through the arrangement mode of the flat wires, each phase of winding forms 2 annular loops which are connected end to end. The phase consists of 64 flat wires connected in sequence, with 1 break point on each loop, so that it forms 2 branches. Wherein each branch comprises 32 flat wires.

The welding ends of the pins of the first layer of conductor layer inserted in the first stator slot in the third stator slot group are not connected with the welding ends of the pins of the second layer of conductor layer inserted in the first stator slot in the fourth stator slot group, so that a first breakpoint is generated between the two pins, wherein the welding ends of the pins of the first layer of conductor layer inserted in the first stator slot in the third stator slot group are formed as leading-out ends of the first branch, and the welding ends of the pins of the second layer of conductor layer inserted in the first stator slot in the fourth stator slot group are formed as leading-in ends of the first branch.

Further, the welding end of the pin of the first layer of conductor layer inserted in the first stator slot group is not connected with the welding end of the pin of the second layer of conductor layer inserted in the first stator slot in the second stator slot group, so that a second breakpoint is generated between the two pins, wherein the welding end of the pin of the first layer of conductor layer inserted in the first stator slot group is formed as the leading-out end of the second branch, and the welding end of the pin of the second layer of conductor layer inserted in the first stator slot in the second stator slot group is formed as the leading-in end of the second branch.

In other embodiments, the positions of the two break points need only be located on the two loop circuits, which is not limited herein.

A specific embodiment of the present invention is described with reference to fig. 9.

As shown in fig. 9, the stator winding comprises 3 phases, each corresponding 4 stator slot groups, each pole has 4 slots per phase, each phase winding comprises 2 branches, and the stator winding forms 4 conductor layers along the radial direction of the stator core. Wherein the pitch of the third flat wire 30 is y+3 and the pitch of the fourth flat wire is Y-1.

Through the arrangement mode of the flat wires, each phase of winding forms 2 annular loops which are connected end to end. The phase consists of 32 flat wires connected in sequence, with 1 break point on each loop, so that it forms 2 branches. Wherein each branch comprises 16 flat wires.

A specific embodiment of the present invention is described with reference to fig. 10.

As shown in fig. 10, the stator winding includes 3 phases, each corresponding 8 stator slot groups, each pole has 4 slots per phase, each phase winding includes 4 branches, and the stator winding forms 4 conductor layers along the radial direction of the stator core. Wherein the pitch of the third flat wire 30 is y+3 and the pitch of the fourth flat wire is Y-1.

By the arrangement mode of the flat wires, 4 annular loops which are connected end to end are formed by each phase of windings. The phase consists of 64 flat wires connected in sequence, with 1 break point on each loop, so that it forms 4 branches. Wherein each branch comprises 16 flat wires.

Further, the welding end of the pin of the first layer of conductor layer inserted in the first stator slot in the fifth stator slot group is not connected with the welding end of the pin of the second layer of conductor layer inserted in the first stator slot in the sixth stator slot group, so that a second break point is generated between the two pins, wherein the welding end of the pin of the first layer of conductor layer inserted in the first stator slot in the fifth stator slot group is formed as the leading-out end of the second branch, and the welding end of the pin of the second layer of conductor layer inserted in the first stator slot in the sixth stator slot group is formed as the leading-in end of the second branch.

Further, the welding end of the pin of the first layer of conductor layer inserted in the first stator slot in the seventh stator slot group is not connected with the welding end of the pin of the second layer of conductor layer inserted in the first stator slot in the eighth stator slot group, so that a third break point is generated between the two pins, wherein the welding end of the pin of the first layer of conductor layer inserted in the first stator slot in the seventh stator slot group is formed as the leading-out end of the third branch, and the welding end of the pin of the second layer of conductor layer inserted in the first stator slot in the eighth stator slot group is formed as the leading-in end of the third branch.

Still further, the welded ends of the pins of the first layer of conductor layer inserted in the first stator slot group are not connected with the welded ends of the pins of the second layer of conductor layer inserted in the first stator slot in the second stator slot group, so that a fourth breakpoint is generated between the two pins, wherein the welded ends of the pins of the first layer of conductor layer inserted in the first stator slot group are formed as the lead-out ends of the fourth branch, and the welded ends of the pins of the second layer of conductor layer inserted in the first stator slot in the second stator slot group are formed as the lead-in ends of the fourth branch.

A specific embodiment of the present invention is described with reference to fig. 11.

As shown in fig. 11, the stator winding includes 3 phases, each corresponding 8 stator slot groups, each pole has 4 slots per phase, each phase winding includes 4 branches, and the stator winding forms 2 conductor layers along the radial direction of the stator core. Wherein the pitch of the third flat wire 30 is y+3 and the pitch of the fourth flat wire is Y-1.

By the arrangement mode of the flat wires, 4 annular loops which are connected end to end are formed by each phase of windings. The phase consists of 32 flat wires connected in sequence, with 1 break point on each loop, so that it forms 4 branches. Wherein each branch comprises 8 flat wires.

The welding ends of the pins of the first layer of conductor layer inserted in the first stator slot group are not connected with the welding ends of the pins of the second layer of conductor layer inserted in the first stator slot in the second stator slot group, so that a first break point is generated between the two pins, wherein the welding ends of the pins of the first layer of conductor layer inserted in the first stator slot group are formed as leading-out ends of the first branch, and the welding ends of the pins of the second layer of conductor layer inserted in the first stator slot in the second stator slot group are formed as leading-in ends of the first branch.

Further, the welding end of the pin of the first layer of conductor layer inserted in the first stator slot in the third stator slot group is not connected with the welding end of the pin of the second layer of conductor layer inserted in the first stator slot in the fourth stator slot group, so that a second break point is generated between the two pins, wherein the welding end of the pin of the first layer of conductor layer inserted in the first stator slot in the third stator slot group is formed as the leading-out end of the second branch, and the welding end of the pin of the second layer of conductor layer inserted in the first stator slot in the fourth stator slot group is formed as the leading-in end of the second branch.

Further, the welding end of the pin of the first layer of conductor layer inserted in the first stator slot in the fifth stator slot group is not connected with the welding end of the pin of the second layer of conductor layer inserted in the first stator slot in the sixth stator slot group, so that a third breakpoint is generated between the two pins, wherein the welding end of the pin of the first layer of conductor layer inserted in the first stator slot in the fifth stator slot group is formed as the leading-out end of the third branch, and the welding end of the pin of the second layer of conductor layer inserted in the first stator slot in the sixth stator slot group is formed as the leading-in end of the third branch.

Still further, the welding end of the pin of the first layer of conductor inserted into the first stator slot in the seventh stator slot group is not connected to the welding end of the pin of the second layer of conductor inserted into the first stator slot in the eighth stator slot group, so that a fourth break point is generated between the two pins, wherein the welding end of the pin of the first layer of conductor inserted into the first stator slot in the seventh stator slot group is formed as the lead-out end of the fourth branch, and the welding end of the pin of the second layer of conductor inserted into the first stator slot in the eighth stator slot group is formed as the lead-in end of the fourth branch.

The motor according to the embodiment of the present invention includes the motor stator according to the above-described embodiment. In the motor, the motor stator is adopted, so that the motor performance is better.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Other constructions of the motor are well known to those skilled in the art and will not be described in detail herein.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. The stator of the motor comprises a stator core and stator windings, wherein the stator core is provided with a plurality of stator slots which are circumferentially distributed, each adjacent four stator slots form a stator slot group, the ratio of the number of slots of the stator slots arranged on the stator core to the number of poles of the motor is Y, the stator windings are characterized by comprising M phases, each phase winding occupies one stator slot group, each corresponding 2P stator slot groups, the stator windings penetrate through a plurality of stator slots along the circumferential direction of the stator core and form 2N conductor layers along the radial direction of the stator core, each corresponding stator slot group is arranged along a first direction, the stator slots in each stator slot group are arranged along the first direction,

2. A stator of an electric motor as set forth in claim 1, wherein there are P breaks in each phase winding, P legs are formed, and the legs on both sides of the break are formed with the lead-in or lead-out of the legs.

3. The motor stator according to claim 2, wherein the lead-in end and the lead-out end of the P branches are located at the crown end of the pin of the flat wire or the welding end of the pin of the flat wire at the same time, the pins corresponding to the lead-in ends of the P branches are located at the same conductor layer, the pins corresponding to the lead-out ends of the P branches are located at the same conductor layer, and the spans between any adjacent two break points are the same in the circumferential direction of the stator core.

4. A motor stator as claimed in claim 1 wherein P is singular and each phase winding comprises an endless loop connected end to end, said endless loop having at least one break point.

5. The motor stator of claim 1 wherein P is a double number and not a multiple of 4 and each phase winding comprises two endless loops of equal length connected end to end, said endless loops having at least one break point, and the number of break points on both said endless loops being the same.

6. The motor stator of claim 1 wherein P is a multiple of 4 and each phase winding comprises four endless loops of equal length connected end to end, said endless loops having at least one break point, the number of break points on the four endless loops being the same.

7. An electric motor stator according to claim 1, wherein each phase winding comprises a plurality of said branches, which may be connected in series or in parallel with each other, or which may be connected in series and then in parallel with each other.

8. The motor stator according to claim 1, wherein the flat wire includes:

two pins, which are used for being inserted into the stator slots to form the conductor layer;

The crown part is connected between the two pins and is in an outward convex shape;

and one end of the pin, which is far away from the crown part, forms a welding part.

9. The motor stator according to claim 8, wherein the lead-in or lead-out of the branch is formed on the pins on both sides of the break point.

10. An electric machine comprising an electric machine stator as claimed in any one of claims 1-9.