Motor stator and motor

Abstract

The application discloses a motor stator and a motor, wherein the motor stator comprises a stator core and a stator winding, a plurality of axially-through stator slots are uniformly arranged on the inner wall of the stator core in the circumferential direction, the number of slots per pole per phase is 4, the stator winding comprises a plurality of flat wires inserted into the stator slots, the flat wires in one phase are 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, and the pins of the flat wires on the two sides of the breakpoint form the start point or the end point of any parallel branch in the winding of each phase. The connection mode of the stator winding of the motor stator is widely applicable, the sum of the distribution of each branch in each pole is equal, the potential of each branch is equal, and the generation of circulating current is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor stator and a motor. Background Art

[0002] In the existing technology, in order to achieve higher power torque density, the stator winding of the vehicle's drive motor uses a flat copper coil with a higher slot fill rate. Since the flat copper wire is a formed winding, when the stator winding adopts different numbers of parallel branches, the stator winding needs to adopt different arrangements. The design process is complicated and there is room for improvement. Summary of the Invention

[0003] The present invention aims to at least partially address one of the aforementioned technical problems in the prior art. To this end, the present invention provides a motor stator having a stator winding connection method that is widely applicable, and wherein the sum of the distribution of each branch at each pole is equal, ensuring that the potential sum of each branch is equal and preventing the generation of circulating currents.

[0004] The present invention also provides a motor having the motor stator.

[0005] According to an embodiment of the present invention, a motor stator includes a stator core and a stator winding. The stator core has a plurality of stator slots arranged circumferentially thereof, and each adjacent four stator slots constitute a stator slot group. The ratio of the number of stator slots provided in the stator core to the number of motor poles is Y. The stator winding includes M phases, and each pole and each phase winding occupies one stator slot group. Each phase corresponds to 2P stator slot groups. The stator winding is arranged in the plurality of stator slots along the circumference of the stator core and forms 2N conductor layers along the radial direction of the stator core. Each corresponding stator slot group is arranged along a first direction, and the stator slots in each stator slot group are arranged along the first direction.

[0006] The stator winding includes a plurality of flat wires inserted into the stator slots. The flat wires have two pins. The pins have a crown end and a welding end. The crown ends of the two pins of one flat wire are connected. The flat wires can be divided into:

[0007] a first flat wire, wherein two pins of the first flat wire are inserted into the 2kth conductor layer and the 2k+1th conductor layer of the stator slot, and a pitch of the first flat wire is Y;

[0008] a second flat wire, wherein two pins of the second flat wire are simultaneously inserted into the 2Nth conductor layer of the stator slot and the two pins are respectively inserted into the 2bth stator slot group and the 2b-1th stator slot group of the same phase, and the pitch of the second flat wire is Y;

[0009] The third flat wire and the fourth flat wire, the two pins of the third flat wire and the fourth flat wire are simultaneously arranged in the first conductor layer position of the stator slot,

[0010] The two pins of the third flat wire are respectively inserted into the 1st stator slot of the 2bth stator slot group and the 4th stator slot of the 2b-1th stator slot group of the same phase, and the pitch of the third flat wire is Y-3. The two pins of the fourth flat wire are respectively inserted into the mth slot of the 2bth stator slot group and the m-1th slot of the 2b-1st stator slot group, and the pitch of the fourth flat wire is Y+1. Alternatively, the two pins of the third flat wire are respectively inserted into the 4th stator slot of the 2bth stator slot group and the 1st stator slot of the 2b-1st stator slot group of the same phase, and the pitch of the third flat wire is Y+3. The two pins of the fourth flat wire are respectively inserted into the mth slot of the 2bth stator slot group and the m+1th slot of the 2b-1st stator slot group, and the pitch of the fourth flat wire is Y-1.

[0011] Among them, the welding end of the pin of one of the flat wires located in the same phase and inserted in the 2k-1 conductor layer of the m-th stator slot of the a-th stator slot group is connected to the welding end of the pin of another flat wire inserted in the 2k conductor layer of the m-th stator slot of the a+1-th stator slot group, so that the corresponding flat wires are connected in sequence to form one or more end-to-end ring loops, and there is at least one breakpoint outside the pin of the flat wire on any of the ring loops, so that the ring loop is formed into at least one branch, and the pins on both sides of the breakpoint respectively form the starting point or end point of any one of the branches in each phase winding, and M, N, P, a, b, m, k are integers, m≤4, k≤N.

[0012] According to the motor stator of the embodiment of the present invention, the connection method of the stator winding of the motor stator has a wide range of applications, and the sum of each branch distributed at each pole is equal, ensuring that the potential of each branch is equal and avoiding the generation of circulating current.

[0013] In addition, the motor stator according to the embodiment of the invention may also have the following additional technical features:

[0014] According to some embodiments of the present invention, there are P breakpoints in each phase winding, forming P branches, and the lead-in ends or lead-out ends of the branches are formed on the pins on both sides of the breakpoints.

[0015] According to some embodiments of the present invention, the lead-in ends and lead-out ends of the P branches are simultaneously located at the crown ends of the pins of the flat wire or the welding ends of the pins of the flat wire, and the pins corresponding to the lead-in ends of the P branches are located in the same conductor layer, and the pins corresponding to the lead-out ends of the P branches are located in the same conductor layer, and in the circumferential direction of the stator core, the span between any two adjacent breakpoints is the same.

[0016] According to some embodiments of the present invention, P is an odd number, and each phase winding includes a ring loop connected end to end, and the ring loop has at least one breakpoint.

[0017] According to some embodiments of the present invention, P is an even number and not a multiple of 4, each phase winding includes two ring loops connected end to end and of equal length, each ring loop has at least one breakpoint, and the number of breakpoints on the two ring loops is the same.

[0018] According to some embodiments of the present invention, P is a multiple of 4, each phase winding includes four ring loops connected end to end and of equal length, each ring loop has at least one breakpoint, and the number of breakpoints on the four ring loops is the same.

[0019] According to some embodiments of the present invention, each phase winding includes a plurality of branches, and the plurality of branches may be connected in series or in parallel, or the plurality of branches may be connected in series and then in parallel.

[0020] According to some embodiments of the present invention, the flat wire includes: two pins, which are used to be inserted into the stator slots to form the conductor layer; a crown portion, which is connected between the two pins and is convex; wherein the end of the pin away from the crown portion forms a welding portion.

[0021] According to some embodiments of the present invention, the lead-in end or the lead-out end of the branch is formed on the pins on both sides of the breakpoint.

[0022] A motor according to another aspect of the present invention includes the above-mentioned motor stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the arrangement of stator windings according to an embodiment of the present invention;

[0024] Figure 2 is a schematic structural diagram of a third flat wire and a fourth flat wire according to an embodiment of the present invention;

[0025] Figure 3 is a schematic structural diagram of a first flat wire according to an embodiment of the present invention;

[0026] Figure 4 is a schematic structural diagram of a second flat wire according to an embodiment of the present invention;

[0027] Figure 5 is a schematic diagram of the arrangement of stator windings according to an embodiment of the present invention;

[0028] Figure 6 is a schematic diagram of the arrangement of stator windings according to an embodiment of the present invention;

[0029] Figure 7 is a schematic diagram of the arrangement of stator windings according to an embodiment of the present invention;

[0030] Figure 8 is a schematic diagram of the arrangement of stator windings according to an embodiment of the present invention;

[0031] Figure 9 is a schematic diagram of the arrangement of stator windings according to an embodiment of the present invention;

[0032] Figure 10 is a schematic diagram of the arrangement of stator windings according to an embodiment of the present invention;

[0033] Figure 11 Schematic diagram of the arrangement of stator windings according to an embodiment of the present invention.

[0034] Reference numerals:

[0035] 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 portion 11 , and a crown portion 2 . DETAILED DESCRIPTION

[0036] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0038] In the existing technology, in order to achieve higher power torque density, the stator winding of the vehicle's drive motor uses flat copper coils with a higher slot fill rate. Since the flat copper coils are formed windings, when the stator winding uses a different number of parallel branches per phase, the stator winding needs to adopt a different arrangement method, which makes the design process complicated.

[0039] To this end, an embodiment of the present invention designs a stator winding arrangement method that is applicable to a wider range while ensuring that the sum of the distribution of each branch at each pole is equal. This simplifies the design process of the stator winding arrangement method of the drive motor and reduces the design cost. Moreover, since the sum of the distribution of each branch at each pole is equal, the potential of each branch is ensured to be equal, thereby avoiding the generation of circulating current.

[0040] Reference below Figures 1-11 A stator for a motor according to an embodiment of the present invention is described.

[0041] The motor stator according to the embodiment of the present invention may include a stator core and a stator winding.

[0042] Furthermore, the stator core has a plurality of stator slots arranged circumferentially thereof, and each adjacent four stator slots constitute a stator slot group. Each pole and each phase winding occupies one stator slot group, that is, the number of slots per pole and per phase of the motor stator is 4.

[0043] The stator winding consists of M phases, each of which corresponds to 2P stator slot groups. In other words, each phase of the stator winding has P pairs of electrodes. The ratio of the number of stator slots in the stator core to the number of motor poles is Y. The stator winding is arranged in multiple stator slots along the circumference of the stator core and forms 2N conductor layers in the radial direction of the stator core.

[0044] Each corresponding stator slot group is arranged along a first direction and the stator slots in each stator slot group are arranged along the first direction. The first direction may be a clockwise direction (e.g., Figure 1 OA direction as shown) or counterclockwise (as Figure 1 OB direction as shown), and the four stator slots in each stator slot group are arranged along the first direction, namely the first slot, the second slot, the third slot and the fourth slot.

[0045] The stator winding includes several flat wires inserted into the stator slots of the stator core. The flat wire includes two connected pins 1. The flat wire is formed into a "U" shape. The pin 1 of the flat wire has a crown end and a welding end. The crown ends of the two pins of a flat wire are connected. In other words, one end of the two pins 1 that are connected to each other is the crown end, and the other end is the welding end.

[0046] Furthermore, 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 .

[0047] Among them, the two pins 1 of the first flat wire 10 are respectively inserted in the 2k-1 conductor layer and the 2k+1 conductor layer of the stator slot, and the pitch of the first flat wire 10 is Y. The welding end of the pin 1 of a flat wire in the same phase inserted in the 2k-1 conductor layer of the m-th stator slot of the a-th stator slot group is connected to the welding end of the pin 1 of another flat wire inserted in the 2k conductor layer of the m-th stator slot of the a+1-th stator slot group.

[0048] Thus, after all the first flat wires 10 are connected to each other, 8P coil units are formed in one phase, which are arranged in parallel and do not intersect with each other. The coil unit extends from the second conductor layer in the stator slot to the 2N-1 conductor layer in the stator slot. The pin 1 of the first flat wire 10 located in the second conductor layer in each stator slot forms the first end of the coil unit, and the pin 1 of the first flat wire 10 located in the 2N-1 conductor layer in each stator slot forms the second end of the coil unit.

[0049] Furthermore, the two pins 1 of the second flat wire 20 are simultaneously inserted into the 2Nth conductor layer of the stator slot and the two pins 1 are respectively inserted into the 2bth stator slot group and the 2b-1th stator slot group of the same phase. The pitch of the second flat wire 20 is Y. The welding end of the pin 1 of a flat wire located in the same phase and inserted in the 2k-1th conductor layer of the mth stator slot of the ath stator slot group is connected to the welding end of the pin 1 of another flat wire inserted in the 2kth conductor layer of the mth stator slot of the a+1th stator slot group.

[0050] Thus, two coil units whose second ends are located in the 2N-1 conductor layer of the stator slots of the same sequence in two adjacent stator slot groups are connected in series through the second flat wire 20 .

[0051] That is, after all first flat wires 10 and second flat wires 20 are interconnected, they form 4P non-intersecting short branches within a phase. These short branches extend from the second conductor layer within the stator slots to the 2N-1 conductor layer within the stator slots, turn through the second flat wire 20 located in the 2N conductor layer, and then return to the second conductor layer within the stator slots via the 2N-1 conductor layer. The pin 1 of the first flat wire 10 inserted into the second conductor layer of the c-th stator slot within the 2b+1 stator slot group forms the first end of one of the short branches, while the pin 1 of the first flat wire 10 inserted into the second conductor layer of the c-th stator slot within the 2b+2 stator slot group forms the second end of the short branch.

[0052] Furthermore, the two pins 1 of the third flat wire 30 and the fourth flat wire 40 are simultaneously inserted into the first 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 2b-th stator slot group and the first slot of the 2b-1-th stator slot group of the same phase, and the pitch of the third flat wire 30 is Y+3.

[0053] Furthermore, since the welding end of pin 1 of the 2k-1th conductor layer of the mth stator slot of the ath stator slot group of one flat wire located in the same phase is connected to the welding end of pin 1 of the 2kth conductor layer of the mth stator slot of the a+1th stator slot group of another flat wire, the third flat wire 30 connects in series the short branch whose first end is located at the 2nd conductor layer of the fourth slot in the 2b+1th stator slot group and the short branch whose second end is located at the 2nd conductor layer of the first slot in the 2bth stator slot group.

[0054] The two pins 1 of the fourth flat wire 40 are respectively located in the mth slot of the 2bth stator slot group and the m+1th slot of the 2b-1th stator slot group. The pitch of the fourth flat wire 40 is Y-1. The welding end of the pin 1 of one flat wire located in the same phase and inserted in the 2k-1th conductor layer of the mth stator slot of the ath stator slot group is connected to the welding end of the pin 1 of another flat wire inserted in the 2kth conductor layer of the mth stator slot of the a+1th stator slot group.

[0055] Thus, one fourth flat wire 40 connects in series a short branch with its first end located in the second conductor layer of the first slot in the 2b+1 stator slot group and a short branch with its second end located in the second conductor layer of the second slot in the 2b stator slot group. Another fourth flat wire 40 connects in series a short branch with its first end located in the second conductor layer of the second slot in the 2b+1 stator slot group and a short branch with its second end located in the second conductor layer of the third slot in the 2b stator slot group. Yet another fourth flat wire 40 connects in series a short branch with its first end located in the second conductor layer of the third slot in the 2b+1 stator slot group and a short branch with its second end located in the second conductor layer of the fourth slot in the 2b stator slot group. Thus, the third and fourth flat wires 30 and 40 sequentially connect the 4P non-intersecting short branches formed within a phase, forming one end-to-end loop, two end-to-end loops, or four end-to-end loops.

[0056] Alternatively, the two pins 1 of the third flat wire 30 are respectively inserted into the first slot of the 2b-th stator slot group and the fourth slot of the 2b-1-th stator slot group in the same phase. The pitch of the third flat wire 30 is Y-3. The soldered end of the pin 1 of one flat wire in the same phase, inserted into the 2k-1-th conductor layer of the m-th stator slot of the a-th stator slot group, is connected to the soldered end of the pin 1 of the other flat wire in the 2k-th conductor layer of the m-th stator slot of the a+1-th stator slot group. Thus, the third flat wire 30 connects in series a short branch whose first end is located in the second conductor layer of the first slot of the 2b+1-th stator slot group and a short branch whose second end is located in the second conductor layer of the fourth slot of the 2b-th stator slot group.

[0057] The two pins 1 of the fourth flat wire 40 are respectively located in the mth slot of the 2bth stator slot group and the m-1th slot of the 2b-1th stator slot group. The pitch of the fourth flat wire 40 is Y+1, and the welding end of the pin 1 of one flat wire located in the same phase and inserted in the 2k-1th conductor layer of the mth stator slot of the ath stator slot group is connected to the welding end of the pin 1 of another flat wire inserted in the 2kth conductor layer of the mth stator slot of the a+1th stator slot group.

[0058] Thus, one fourth flat wire 40 connects in series a short branch with its first end located in the second conductor layer of the second slot in the 2b+1 stator slot group and a short branch with its second end located in the second conductor layer of the first slot in the 2b stator slot group. Another fourth flat wire 40 connects in series a short branch with its first end located in the second conductor layer of the third slot in the 2b+1 stator slot group and a short branch with its second end located in the second conductor layer of the second slot in the 2b+2 stator slot group. Yet another fourth flat wire 40 connects in series a short branch with its first end located in the second conductor layer of the fourth slot in the 2b+1 stator slot group and a short branch with its second end located in the second conductor layer of the third slot in the 2b+2 stator slot group. Thus, the third flat wires 30 and the fourth flat wires 40 sequentially connect the corresponding multiple short branches in series, forming one end-to-end loop, two end-to-end loops, or four end-to-end loops.

[0059] Through the above arrangement, a corresponding flat wire is connected in sequence to form one or more end-to-end ring loops. There is at least one breakpoint outside the pins of the flat wire on any of the ring loops, so that the ring loop is formed into at least one branch, and the pins on both sides of the breakpoint respectively form the starting point or end point of any branch in each phase winding.

[0060] The breakpoints 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. Furthermore, when there are multiple breakpoints on a circular loop, the distance between two adjacent breakpoints in the winding direction is equidistant.

[0061] M, N, P, a, b, m, k are integers, m≤4, k≤N.

[0062] According to the motor stator of the embodiment of the present invention, the connection method of the stator winding of the motor stator has a wide range of applications, and the sum of each branch distributed at each pole is equal, ensuring that the potential of each branch is equal and avoiding the generation of circulating current.

[0063] According to some embodiments of the present invention, P is an odd number, and each phase winding includes a ring loop connected end to end, and the ring loop has at least one breakpoint.

[0064] According to other embodiments of the present invention, P is an even number and not a multiple of 4, each phase winding includes two ring loops connected end to end and of equal length, each ring loop has at least one breakpoint, and the number of breakpoints on the two ring loops is the same.

[0065] According to some further embodiments of the present invention, P is a multiple of 4, each phase winding includes four annular loops connected end to end and of equal length, each annular loop has at least one breakpoint, and the number of breakpoints on the four annular loops is the same.

[0066] Specifically, when P is a multiple of 4, the flat wires in one phase form four end-to-end ring loops in the above arrangement; when P is a multiple of 2 but not a multiple of 4, the flat wires in one phase form two end-to-end ring loops in the above arrangement; and when P is an odd number, the flat wires in one phase form one end-to-end ring loop in the above arrangement.

[0067] In some embodiments, when P is a multiple of 4, the flat wires in one phase form four end-to-end ring loops in the above arrangement, each phase includes 8N×P flat wires, each ring loop includes 2N×P flat wires, and there are x breakpoints on the ring loop, where x is a divisor of 2N×P. The x breakpoints divide the four end-to-end ring loops into 4x identical branches, and the x breakpoints are equidistant in the winding direction.

[0068] In other embodiments, when P is a multiple of 2 but not a multiple of 4, the flat wires in one phase form two end-to-end connected ring loops under the above-mentioned arrangement, each phase includes 8N×P flat wires, each ring loop includes 4N×P flat wires, and there are y breakpoints on the ring loop, where y is a divisor of 4N×P. The y breakpoints divide the two end-to-end connected ring loops into 2y identical branches, and the y breakpoints are equidistant in the winding direction.

[0069] In still other embodiments, when P is an odd number, the flat wires within a phase, when arranged in the above manner, form a loop connected end-to-end. This loop comprises 8N × P flat wires. There are z breakpoints in this loop, where z is a divisor of 8N × P. These breakpoints divide the loop into z identical branches, and the z breakpoints are equidistant in the winding direction. x, y, and z are integers.

[0070] For example, when P = 4 and N = 3, the above arrangement of flat wires forms four end-to-end loops for each phase winding. These loops consist of 24 sequentially connected flat wires, with 24 having eight common divisors: 1, 24, 2, 12, 3, 8, 4, and 6. Therefore, a loop can have one breakpoint, forming four branches for each phase winding; a loop can have two breakpoints, forming eight branches for each phase winding; a loop can have three breakpoints, forming 12 branches for each phase winding, and so on.

[0071] For example, when P = 6 and N = 3, the above arrangement of flat wires forms two end-to-end loops for each phase winding. These loops include 72 sequentially connected flat wires, with 72 having 12 common divisors: 1, 72, 2, 36, 3, 24, 4, 18, 6, 12, 8, and 9. Therefore, a loop can have one breakpoint, forming two branches per phase winding; a loop can have two breakpoints, forming four branches per phase winding; a loop can have three breakpoints, forming six branches per phase winding; a loop can have six breakpoints, forming 12 branches per phase winding; a loop can have eight breakpoints, forming 16 branches per phase winding, and so on.

[0072] For example, when P = 7 and N = 3, the above arrangement of flat wires forms a loop with each phase winding connected end to end. This loop includes 168 sequentially connected flat wires, where 168 has 16 common divisors, including 1, 168, 2, 84, 3, 56, 4, 42, 6, 28, 7, 24, 8, 21, 12, and 14. Therefore, this loop can have one breakpoint forming one branch, two breakpoints forming two branches, three breakpoints forming three branches, four breakpoints forming four branches, six breakpoints forming six branches, seven breakpoints forming seven branches, eight breakpoints forming eight branches, twelve breakpoints forming twelve branches, and so on.

[0073] For example, when P = 3 and N = 3, the above arrangement of flat wires forms a loop with each phase winding connected end to end. This loop includes 72 consecutively connected flat wires, where 72 has 12 common divisors: 1, 72, 2, 36, 3, 24, 4, 18, 6, 12, 8, and 9. Therefore, the loop can have one breakpoint forming one branch, two breakpoints forming two branches, three breakpoints forming three branches, four breakpoints forming four branches, six breakpoints forming six branches, eight breakpoints forming eight branches, nine breakpoints forming nine branches, and so on.

[0074] In some embodiments, there may be three breakpoints on the circular loop, thereby forming three branches, each branch including 24 flat wires connected in sequence.

[0075] For example, the crown ends of the pins of the flat wires whose pins 1 are respectively inserted into the second conductor layer of the first stator slot of the second stator slot group and the third conductor layer of the first stator slot of the third stator slot group can be disconnected to form a first breakpoint, and the crown ends of the pins of the flat wires whose pins 1 are respectively inserted into the second conductor layer of the first stator slot of the fourth stator slot group and the third conductor layer of the first stator slot of the fifth stator slot group can be disconnected to form a second breakpoint, and then the crown ends of the pins of the flat wires whose pins 1 are respectively inserted into the second conductor layer of the first stator slot of the sixth stator slot group and the third conductor layer of the first stator slot of the first stator slot group can be disconnected to form a third breakpoint.

[0076] As a result, three branches are formed in this phase, namely the first branch whose starting point is located at the crown end of pin 1 of the third conductor layer inserted in the first stator slot of the third stator slot group and whose end point is located at the crown end of pin 1 of the second conductor layer of the first stator slot of the sixth stator slot group; the second branch whose starting point is located at the crown end of pin 1 of the third conductor layer inserted in the first stator slot of the fifth stator slot group and whose end point is located at the crown end of pin 1 of the second conductor layer inserted in the first stator slot of the second stator slot group; and the third branch whose starting point is located at the crown end of pin 1 of the third conductor layer inserted in the first stator slot of the first stator slot group and whose end point is located at the crown end of pin 1 of the second conductor layer inserted in the first stator slot of the fourth stator slot group.

[0077] For example, the welding end of pin 1 of the second conductor layer inserted in the first stator slot of the second stator slot group and the welding end of pin 1 of another flat wire inserted in the first conductor layer of the first stator slot of the first stator slot group can be disconnected to form a first break point, and the welding end of pin 1 of the second conductor layer inserted in the first stator slot of the fourth stator slot group and the welding end of pin 1 of another flat wire inserted in the first conductor layer of the first stator slot of the third stator slot group can be disconnected to form a second break point, and then the welding end of pin 1 of the second conductor layer inserted in the first stator slot of the sixth stator slot group and the welding end of pin 1 of another flat wire inserted in the first conductor layer of the first stator slot of the fifth stator slot group can be disconnected to form a third break point.

[0078] As a result, three branches are formed in this phase, namely the first branch whose starting point is located at the welding end of pin 1 of the second conductor layer inserted in the first stator slot of the second stator slot group and whose end point is located at the welding end of pin 1 of the first conductor layer of the first stator slot of the fifth stator slot group; the second branch whose starting point is located at the welding end of pin 1 of the second conductor layer inserted in the first stator slot of the fourth stator slot group and whose end point is located at the welding end of pin 1 of the first conductor layer inserted in the first stator slot of the first stator slot group; and the third branch whose starting point is located at the welding end of pin 1 of the second conductor layer inserted in the first stator slot of the sixth stator slot group and whose end point is located at the welding end of pin 1 of the first conductor layer inserted in the first stator slot of the third stator slot group.

[0079] There are many locations where breakpoints exist in the circular loop, which are not limited here.

[0080] The above-mentioned arrangement of the stator winding can be applied to situations where the stator winding is difficult to arrange, such as when the number of slots per pole and per phase is 4 and the number of branches is 3. This arrangement has a wider range of applications, is more convenient for the design of the motor stator, and reduces production costs.

[0081] According to some embodiments of the present invention, each phase winding has P breakpoints, each phase winding forms P branches, and the number of breakpoints is equal to the number of branches. Thus, regardless of whether each phase winding forms one, two, or four loops, the P breakpoints can divide one or more loops into P branches of equal length.

[0082] On each circular loop, if there are multiple breakpoints, the breakpoints are equidistant in the winding direction, and the positions of the breakpoints on each circular loop may be unrelated.

[0083] The pins on either side of the breakpoint form the lead-in or lead-out ends of the branch. Since the pins on either side of the breakpoint can form the lead-in or lead-out end of any branch in each phase winding, when there is only one breakpoint in a circular loop, the pins on either side of the breakpoint can form the lead-in and lead-out ends of one of the branches. When there are multiple breakpoints in a circular loop, the two pins on either side of the breakpoint can respectively form the lead-in end of one branch and the lead-out end of another branch.

[0084] The lead-in and lead-out ends of the P branches are simultaneously located 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 lead-in and lead-out ends of multiple branches of each phase winding are located in the same direction, facilitating the mutual connection between multiple branches.

[0085] Moreover, the pins corresponding to the lead-in ends of the P branches are located on the same conductor layer, and the pins corresponding to the lead-out ends of the P branches are also located on the same conductor layer, so as to ensure that the total distribution of each branch at each pole is equal, ensure that the potential of each branch is equal, avoid the generation of circulating current, and ensure that the distribution position of each branch is regular, so as to facilitate the connection between the lead-in end and the lead-out end of each branch.

[0086] In some embodiments, the pins corresponding to the lead-in and lead-out ends of P branches are located in the same conductor layer. In this case, the breakpoint is located at the crown end of the pin of the flat wire in the first conductor layer or the crown end of the pin of the flat wire in the 2Nth conductor layer.

[0087] The span between any two adjacent breakpoints along the circumference of the stator core is the same. The ratio of the number of stator slots in the stator core to the number of motor poles is Y, and the span between any two adjacent breakpoints is 2Y. This ensures that the lead-in terminals of each branch are positioned regularly and on the same conductor layer, facilitating connections between branches.

[0088] For example, when the first breakpoint is located between the pin of the third conductor layer of the first stator slot of the first stator slot of the first stator slot group and the pin of the fourth conductor layer of the first stator slot of the second stator slot group, the second breakpoint is located between the pin of the third conductor layer of the first stator slot of the third stator slot group and the pin of the fourth conductor layer of the first stator slot of the fourth stator slot group, and the vth breakpoint is located between the pin of the third conductor layer of the first stator slot of the 2v-1 stator slot group and the pin of the fourth conductor layer of the first stator slot of the 2vth stator slot group.

[0089] In some embodiments, the stator winding forms 2P conductor layers along the radial direction of the stator core, thereby making the overall structure of the stator winding more regular.

[0090] Reference Figure 2-Figure 4 The flat wire comprises two pins 1 and a crown 2. The pins 1 are inserted into stator slots to form a conductor layer. The crown 2 is connected between the two pins 1 and has a convex shape, which facilitates the layout and installation of the flat wire. A welding portion 11 is formed on the end of the pin 1 away from the crown 2. The welding portion 11 is located at the welding end of the flat wire pin, and the crown 2 is located at the crown end of the flat wire pin.

[0091] Furthermore, the pins 1 on either side of the breakpoint form the lead-in or lead-out ends of the branch circuit. That is, when the breakpoint is formed at the crown ends of two pins 1 on the same flat wire, the crown ends of the two pins 1 become the lead-in or lead-out ends of the branch circuit, and no crown portion 2 is provided between the two pins 1, and the two pins 1 are not connected to each other. Furthermore, when the breakpoint is formed at the welded ends of two adjacent pins 1 of two adjacent flat wires in the winding direction, the ends of the two corresponding pins 1 away from the crown portion 2 do not form the welded portion 11 and are not welded to each other, but instead become the lead-in or lead-out ends of the branch circuit.

[0092] According to some embodiments of the present invention, the crown portion 2 of each flat wire of the stator winding is located on one side of the outer end of the stator slot of the stator core, and the welding portion 11 is located on the other side of the outer end of the stator slot, so as to make the overall structure of the stator winding more regular and facilitate the installation and welding of the stator winding.

[0093] Reference Figure 3 The welding portions 11 on both sides of the first flat wire 10 extend obliquely away from each other in the extension direction of the pin 1, so that the welding portion 11 on one side is welded to the welding portion 11 of the pin 1 in the adjacent stator slot group on that side.

[0094] like Figure 4 As shown, the welding portions 11 on both sides of the second flat wire 20 extend obliquely in a second direction opposite to the first direction in the extension direction of the pin 1 , so that the stator winding can be turned in the second direction by the second flat wire 20 .

[0095] like Figure 2 As shown, the welding portions 11 on both sides of the third and fourth flat wires 30 and 40 extend obliquely toward the first direction along the extension direction of the pins 1 , so that the stator winding can be turned toward the first direction using the third and fourth flat wires 30 and 40 .

[0096] In some embodiments, two adjacent flat wires in the winding direction are welded together via welding portions 11 to facilitate installation of the stator winding.

[0097] According to some embodiments of the present invention, the multiple branches included in each phase winding can be connected in series or in parallel, or the multiple branches can be connected in series and then in parallel, so as to make the stator winding arrangement more versatile.

[0098] For example, when P=4 and N=3, the arrangement of the flat wires described above forms four end-to-end loops for each phase winding. There can be three breakpoints on a loop, and each phase winding forms 12 branches.

[0099] The 12 branches formed in the above manner can be connected in series and then in parallel. For example, any four of the 12 branches can be connected in series, forming a total of three series branches. For example, any six of the 12 branches can be connected in series, forming a total of two series branches. By connecting the branches in series, each phase winding can form a variety of different numbers of branches, making this arrangement more practical.

[0100] According to some embodiments of the present invention, Figure 1 As shown, the stator winding includes 3 phases, each phase corresponds to 6 stator slot groups, and each phase winding includes 3 branches. Through the above arrangement of the stator winding, one phase and three branches can be achieved when the number of slots per pole and per phase is 4.

[0101] Among them, Figure 5-Figure 11 Each row represents a conductor layer, each column represents a stator slot, and the number before the “-” represents the branch number, and the number after the “-” represents the flat wire coil number. Figure 1 The first row represents the first conductor layer in the stator slot, the second row represents the second and third conductor layers in the stator slot, the third row represents the fourth and fifth conductor layers in the stator slot, and the fourth row represents the sixth conductor layer.

[0102] according to Figure 1 and Figure 5 A specific embodiment of the present invention is described.

[0103] like Figure 1 and Figure 5 As shown, the stator winding includes three phases, with six stator slot groups corresponding to each phase. Each pole and phase has four slots. Each phase winding includes three branches, and the stator winding forms six conductor layers along the radial direction of the stator core. The pitch of the third flat wire 30 is Y+3, and the pitch of the fourth flat wire is Y-1.

[0104] Through the arrangement of the flat wires, each phase winding forms a loop with 72 flat wires connected end to end. The loop has three breakpoints, forming three branches. Each branch includes 24 flat wires.

[0105] The welding end of the pin of the first conductor layer inserted in the first stator slot in the first stator slot group is not connected to the welding end of the pin of the second conductor layer inserted in the first stator slot in the second stator slot group, so that a breakpoint is generated between the two pins. The welding end of the pin of the first conductor layer inserted in the first stator slot in the first stator slot group forms the lead-out end of the second branch, and the welding end of the pin of the second conductor layer inserted in the first stator slot in the second stator slot group forms the lead-in end of the first branch.

[0106] Furthermore, the welding end of the pin of the first conductor layer inserted in the first stator slot in the third stator slot group is not connected to the welding end of the pin of the second conductor layer inserted in the first stator slot in the fourth stator slot group, so that a breakpoint is generated between the two pins, wherein the welding end of the pin of the first conductor layer inserted in the first stator slot in the third stator slot group forms the lead-out end of the third branch, and the welding end of the pin of the second conductor layer inserted in the first stator slot in the fourth stator slot group forms the lead-in end of the second branch.

[0107] Furthermore, the welding end of the pin of the first conductor layer inserted in the first stator slot in the fifth stator slot group is not connected to the welding end of the pin of the second conductor layer inserted in the first stator slot in the sixth stator slot group, so that a breakpoint is generated between the two pins, wherein the welding end of the pin of the first conductor layer inserted in the first stator slot in the fifth stator slot group forms the lead-out end of the first branch, and the welding end of the pin of the second conductor layer inserted in the first stator slot in the sixth stator slot group forms the lead-in end of the third branch.

[0108] according to Figure 6 Another specific embodiment of the present invention is described.

[0109] like Figure 6 As shown, the stator winding includes three phases, with six stator slot groups corresponding to each phase. Each pole and phase has four slots. Each phase winding includes three branches, and the stator winding forms eight conductor layers along the radial direction of the stator core. The pitch of the third flat wire 30 is Y+3, and the pitch of the fourth flat wire is Y-1.

[0110] Through the arrangement of the flat wires, each phase winding forms a loop, connected end to end. This loop includes 96 flat wires connected in sequence. There are three breakpoints in the loop, forming three branches. Each branch includes 32 flat wires.

[0111] The welding end of the pin of the first conductor layer inserted in the first stator slot in the first stator slot group is not connected to the welding end of the pin of the second conductor layer inserted in the first stator slot in the second stator slot group, so that a breakpoint is generated between the two pins. The welding end of the pin of the first conductor layer inserted in the first stator slot in the first stator slot group forms the lead-out end of the second branch, and the welding end of the pin of the second conductor layer inserted in the first stator slot in the second stator slot group forms the lead-in end of the first branch.

[0112] Furthermore, the welding end of the pin of the first conductor layer inserted in the first stator slot in the third stator slot group is not connected to the welding end of the pin of the second conductor layer inserted in the first stator slot in the fourth stator slot group, so that a breakpoint is generated between the two pins, wherein the welding end of the pin of the first conductor layer inserted in the first stator slot in the third stator slot group forms the lead-out end of the third branch, and the welding end of the pin of the second conductor layer inserted in the first stator slot in the fourth stator slot group forms the lead-in end of the second branch.

[0113] Furthermore, the welding end of the pin of the first conductor layer inserted in the first stator slot in the fifth stator slot group is not connected to the welding end of the pin of the second conductor layer inserted in the first stator slot in the sixth stator slot group, so that a breakpoint is generated between the two pins, wherein the welding end of the pin of the first conductor layer inserted in the first stator slot in the fifth stator slot group forms the lead-out end of the first branch, and the welding end of the pin of the second conductor layer inserted in the first stator slot in the sixth stator slot group forms the lead-in end of the third branch.

[0114] according to Figure 7 Another specific embodiment of the present invention is described.

[0115] like Figure 7 As shown, the stator winding includes three phases, with six stator slot groups corresponding to each phase. Each pole and phase has four slots. Each phase winding includes three branches, and the stator winding forms four conductor layers along the radial direction of the stator core. The pitch of the third flat wire 30 is Y+3, and the pitch of the fourth flat wire is Y-1.

[0116] Through the arrangement of the flat wires, each phase winding forms a loop with 48 flat wires connected end to end. The loop has three breakpoints, forming three branches. Each branch includes 16 flat wires.

[0117] Among them, the crown ends of the pins of the first flat wire whose two side pins are respectively inserted into the second conductor layer of the first stator slot in the second stator slot group and the third conductor layer of the first stator slot in the third stator slot group are disconnected to form a first breakpoint between the two pins, wherein the crown end of the pin inserted into the second conductor layer of the first stator slot in the second stator slot group forms the lead-out end of the second branch, and the crown end of the pin inserted into the third conductor layer of the first stator slot in the three stator slot groups forms the lead-in end of the first branch.

[0118] Furthermore, the crown ends of the pins of the first flat wire whose pins on both sides are respectively inserted into the second conductor layer of the first stator slot in the fourth stator slot group and the third conductor layer of the first stator slot in the fifth stator slot group are disconnected to create a second breakpoint between the two pins, wherein the crown end of the pin inserted into the second conductor layer of the first stator slot in the fourth stator slot group forms the lead-out end of the third branch, and the crown end of the pin inserted into the third conductor layer of the first stator slot in the five stator slot groups forms the lead-in end of the second branch.

[0119] Furthermore, the crown ends of the pins of the first flat wire whose pins on both sides are respectively inserted into the second conductor layer of the first stator slot in the sixth stator slot group and the third conductor layer of the first stator slot in the first stator slot group are disconnected to create a third breakpoint between the two pins, wherein the crown end of the pin inserted into the second conductor layer of the first stator slot in the sixth stator slot group forms the lead-out end of the first branch, and the crown end of the pin inserted into the third conductor layer of the first stator slot in a stator slot group forms the lead-in end of the third branch.

[0120] according to Figure 8 A specific embodiment of the present invention is described.

[0121] like Figure 8 As shown, the stator winding includes three phases, with four stator slot groups corresponding to each phase. Each pole and phase has four slots. Each phase winding includes two branches, and the stator winding forms eight conductor layers along the radial direction of the stator core. The pitch of the third flat wire 30 is Y+3, and the pitch of the fourth flat wire is Y-1.

[0122] Through the arrangement of the flat wires described above, each phase winding forms two end-to-end loops. This phase includes 64 consecutively connected flat wires, with a breakpoint in each loop, forming two branches. Each branch includes 32 flat wires.

[0123] Among them, the welding end of the pin of the first conductor layer inserted in the first stator slot in the third stator slot group is not connected to the welding end of the pin of the second 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 end of the pin of the first conductor layer inserted in the first stator slot in the third stator slot group forms the lead-out end of the first branch, and the welding end of the pin of the second conductor layer inserted in the first stator slot in the fourth stator slot group forms the lead-in end of the first branch.

[0124] Furthermore, the welding end of the pin of the first conductor layer inserted in the first stator slot in the first stator slot group is not connected to the welding end of the pin of the second 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 conductor layer inserted in the first stator slot in the first stator slot group is formed as the lead-in end of the second branch, and the welding end of the pin of the second conductor layer inserted in the first stator slot in the second stator slot group is formed as the lead-in end of the second branch.

[0125] In other embodiments, the two breakpoints only need to be located on two ring loops respectively, which is not limited here.

[0126] according to Figure 9 A specific embodiment of the present invention is described.

[0127] like Figure 9 As shown, the stator winding includes three phases, with four stator slot groups corresponding to each phase. Each pole and phase has four slots. Each phase winding includes two branches, and the stator winding forms four conductor layers along the radial direction of the stator core. The pitch of the third flat wire 30 is Y+3, and the pitch of the fourth flat wire is Y-1.

[0128] Through the arrangement of the flat wires, each phase winding forms two end-to-end loops. This phase includes 32 consecutively connected flat wires, with a breakpoint in each loop, forming two branches. Each branch includes 16 flat wires.

[0129] Among them, the welding end of the pin of the first conductor layer inserted in the first stator slot in the third stator slot group is not connected to the welding end of the pin of the second 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 end of the pin of the first conductor layer inserted in the first stator slot in the third stator slot group forms the lead-out end of the first branch, and the welding end of the pin of the second conductor layer inserted in the first stator slot in the fourth stator slot group forms the lead-in end of the first branch.

[0130] Furthermore, the welding end of the pin of the first conductor layer inserted in the first stator slot in the first stator slot group is not connected to the welding end of the pin of the second 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 conductor layer inserted in the first stator slot in the first stator slot group is formed as the lead-in end of the second branch, and the welding end of the pin of the second conductor layer inserted in the first stator slot in the second stator slot group is formed as the lead-in end of the second branch.

[0131] according to Figure 10A specific embodiment of the present invention is described.

[0132] like Figure 10 As shown, the stator winding includes three phases, with eight stator slot groups corresponding to each phase. Each pole and phase has four slots. Each phase winding includes four branches, and the stator winding forms four conductor layers along the radial direction of the stator core. The pitch of the third flat wire 30 is Y+3, and the pitch of the fourth flat wire is Y-1.

[0133] Through the arrangement of the flat wires described above, each phase winding forms four end-to-end loops. This phase comprises 64 consecutively connected flat wires, with one breakpoint in each loop, forming four branches. Each branch comprises 16 flat wires.

[0134] Among them, the welding end of the pin of the first conductor layer inserted in the first stator slot in the third stator slot group is not connected to the welding end of the pin of the second 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 end of the pin of the first conductor layer inserted in the first stator slot in the third stator slot group forms the lead-out end of the first branch, and the welding end of the pin of the second conductor layer inserted in the first stator slot in the fourth stator slot group forms the lead-in end of the first branch.

[0135] Furthermore, the welding end of the pin of the first conductor layer inserted in the first stator slot in the fifth stator slot group is not connected to the welding end of the pin of the second conductor layer inserted in the first stator slot in the sixth stator slot group, so that a second breakpoint is generated between the two pins, wherein the welding end of the pin of the first conductor layer inserted in the first stator slot in the fifth stator slot group is formed as the lead-out end of the second branch, and the welding end of the pin of the second conductor layer inserted in the first stator slot in the sixth stator slot group is formed as the lead-in end of the second branch.

[0136] Furthermore, the welding end of the pin of the first conductor layer inserted in the first stator slot in the seventh stator slot group is not connected to the welding end of the pin of the second conductor layer inserted in the first stator slot in the eighth stator slot group, so that a third breakpoint is generated between the two pins, wherein the welding end of the pin of the first conductor layer inserted in the first stator slot in the seventh stator slot group is formed as the lead-in end of the third branch, and the welding end of the pin of the second conductor layer inserted in the first stator slot in the eighth stator slot group is formed as the lead-in end of the third branch.

[0137] Furthermore, the welding end of the pin of the first conductor layer inserted in the first stator slot in the first stator slot group is not connected to the welding end of the pin of the second 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 welding end of the pin of the first conductor layer inserted in the first stator slot in the first stator slot group is formed as the lead-out end of the fourth branch, and the welding end of the pin of the second conductor layer inserted in the first stator slot in the second stator slot group is formed as the lead-in end of the fourth branch.

[0138] according to Figure 11 A specific embodiment of the present invention is described.

[0139] like Figure 11 As shown, the stator winding includes three phases, with eight stator slot groups corresponding to each phase. Each pole and phase has four slots. Each phase winding includes four branches, and the stator winding forms two conductor layers along the radial direction of the stator core. The pitch of the third flat wire 30 is Y+3, and the pitch of the fourth flat wire is Y-1.

[0140] Through the arrangement of the flat wires described above, each phase winding forms four end-to-end loops. This phase includes 32 consecutively connected flat wires, with one breakpoint in each loop, forming four branches. Each branch includes eight flat wires.

[0141] The welding end of the pin of the first conductor layer inserted in the first stator slot in the first stator slot group is not connected to the welding end of the pin of the second conductor layer inserted in the first stator slot in the second stator slot group, so that a first breakpoint is generated between the two pins. The welding end of the pin of the first conductor layer inserted in the first stator slot in the first stator slot group forms the lead-out end of the first branch, and the welding end of the pin of the second conductor layer inserted in the first stator slot in the second stator slot group forms the lead-in end of the first branch.

[0142] Furthermore, the welding end of the pin of the first conductor layer inserted in the first stator slot in the third stator slot group is not connected to the welding end of the pin of the second conductor layer inserted in the first stator slot in the fourth stator slot group, so that a second breakpoint is generated between the two pins, wherein the welding end of the pin of the first conductor layer inserted in the first stator slot in the third stator slot group is formed as the lead-out end of the second branch, and the welding end of the pin of the second conductor layer inserted in the first stator slot in the fourth stator slot group is formed as the lead-in end of the second branch.

[0143] Furthermore, the welding end of the pin of the first conductor layer inserted in the first stator slot in the fifth stator slot group is not connected to the welding end of the pin of the second 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 conductor layer inserted in the first stator slot in the fifth stator slot group is formed as the lead-in end of the third branch, and the welding end of the pin of the second conductor layer inserted in the first stator slot in the sixth stator slot group is formed as the lead-in end of the third branch.

[0144] Furthermore, the welding end of the pin of the first conductor layer inserted in the first stator slot in the seventh stator slot group is not connected to the welding end of the pin of the second conductor layer inserted in the first stator slot in the eighth stator slot group, so that a fourth breakpoint is generated between the two pins, wherein the welding end of the pin of the first conductor layer inserted in the first stator slot in the seventh stator slot group is formed as the lead-in end of the fourth branch, and the welding end of the pin of the second conductor layer inserted in the first stator slot in the eighth stator slot group is formed as the lead-in end of the fourth branch.

[0145] The motor according to the embodiment of the present invention includes the motor stator according to the above embodiment. In the motor, by adopting the above motor stator, the performance of the motor is improved.

[0146] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0147] The other structures of the motor are already in the prior art and are well known to those skilled in the art, so they will not be described in detail here.

[0148] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0149] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A motor stator, comprising a stator core and a stator winding, wherein the stator core has a plurality of stator slots arranged circumferentially thereof, wherein four adjacent stator slots constitute a stator slot group, and wherein the ratio of the number of stator slots provided in the stator core to the number of motor poles is Y, and wherein: The stator winding includes M phases, each pole and each phase winding occupies one stator slot group, each phase corresponds to 2P stator slot groups, the stator winding is arranged in a plurality of 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 along a first direction, and the stator slots in each stator slot group are arranged along the first direction. The stator winding includes a plurality of flat wires inserted into the stator slots. The flat wires have two pins. The pins have a crown end and a welding end. The crown ends of the two pins of one flat wire are connected. The flat wires can be divided into: a first flat wire, wherein two pins of the first flat wire are inserted into the 2kth conductor layer and the 2k+1th conductor layer of the stator slot, and a pitch of the first flat wire is Y; a second flat wire, wherein two pins of the second flat wire are simultaneously inserted into the 2Nth conductor layer of the stator slot and the two pins are respectively inserted into the 2bth stator slot group and the 2b-1th stator slot group of the same phase, and the pitch of the second flat wire is Y; The third flat wire and the fourth flat wire, the two pins of the third flat wire and the fourth flat wire are simultaneously arranged in the first conductor layer position of the stator slot, The two pins of the third flat wire are respectively inserted into the 1st stator slot of the 2bth stator slot group and the 4th stator slot of the 2b-1th stator slot group of the same phase, and the pitch of the third flat wire is Y-3. The two pins of the fourth flat wire are respectively inserted into the mth slot of the 2bth stator slot group and the m-1th slot of the 2b-1st stator slot group, and the pitch of the fourth flat wire is Y+1. Alternatively, the two pins of the third flat wire are respectively inserted into the 4th stator slot of the 2bth stator slot group and the 1st stator slot of the 2b-1st stator slot group of the same phase, and the pitch of the third flat wire is Y+3. The two pins of the fourth flat wire are respectively inserted into the mth slot of the 2bth stator slot group and the m+1th slot of the 2b-1st stator slot group, and the pitch of the fourth flat wire is Y-1. The welding end of the pin of one of the flat wires in the same phase, which is inserted into the 2k-1 conductor layer of the m-th stator slot of the a-th stator slot group, is connected to the welding end of the pin of another flat wire, which is inserted into the 2k conductor layer of the m-th stator slot of the a+1-th stator slot group, so that the corresponding flat wires are sequentially connected to form one or more end-to-end ring loops. There is at least one breakpoint outside the pins of the flat wire in any of the ring loops, so that the ring loop is formed into at least one branch. The pins on both sides of the breakpoint respectively form the starting point or end point of any branch in each phase winding. M, N, P, a, b, m, and k are integers, and m≤4 and k≤N. The sum of each branch distributed at each pole is equal.

2. The motor stator according to claim 1, characterized in that: There are P breakpoints in each phase winding, forming P branches, and the lead-in ends or lead-out ends of the branches are formed on the pins on both sides of the breakpoints.

3. The motor stator according to claim 2, characterized in that: The lead-in ends and lead-out ends of the P branches are simultaneously located at the crown ends of the pins of the flat wire or the welding ends of the pins of the flat wire, and the pins corresponding to the lead-in ends of the P branches are located on the same conductor layer, and the pins corresponding to the lead-out ends of the P branches are located on the same conductor layer, and in the circumferential direction of the stator core, the span between any two adjacent breakpoints is the same.

4. The motor stator according to claim 1, characterized in that: The P is an odd number, and each phase winding includes a ring loop connected end to end, and the ring loop has at least one breakpoint.

5. The motor stator according to claim 1, characterized in that: The P is an even number and not a multiple of 4. Each phase winding includes two annular loops connected end to end and of equal length. The annular loops have at least one breakpoint, and the two annular loops have the same number of breakpoints.

6. The motor stator according to claim 1, characterized in that: The P is a multiple of 4, and each phase winding includes four annular loops connected end to end and having equal lengths. The annular loops have at least one breakpoint, and the number of breakpoints on the four annular loops is the same.

7. The motor stator according to claim 1, characterized in that: Each phase winding includes a plurality of branches, and the plurality of branches may be connected in series or in parallel, or the plurality of branches may be connected in series and then in parallel.

8. The motor stator according to claim 1, characterized in that: The flat wire comprises: two pins, the pins being used to be inserted into the stator slots to form the conductor layer; a crown portion, the crown portion being connected between the two pins and being convex; Wherein, one end of the pin away from the crown portion forms a welding portion.

9. The motor stator according to claim 8, characterized in that: The pins on both sides of the breakpoint are formed with lead-in ends or lead-out ends of the branch.

10. A motor, characterized in that: The motor comprises the stator according to any one of claims 1 to 9.

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