Motor stator and motor

Abstract

The present invention discloses a motor stator and a motor, wherein the motor stator comprises: a stator core and a stator winding, wherein the inner wall of the stator core is uniformly provided with a plurality of axially penetrating stator slots along the circumferential direction, the stator winding is sequentially arranged in the plurality of stator slots along the circumferential direction of the stator core, and forms a plurality of conductor layers from the inside to the outside or from the outside to the inside, wherein the stator winding is turned through the innermost and outermost conductor layers, and is connected across layers through the intermediate conductor layers to form a bending path, so that the flat wires are sequentially connected to form a plurality of annular branches, and finally, the stator winding forms a plurality of parallel branches by disconnecting any point on the annular branch. The connection method of the stator winding of the motor stator has a wide range of applications, and the sum of the distribution of each branch at each pole is equal, thereby ensuring that the potential sum of each branch is equal and avoiding the generation of circulating current.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically, to a motor stator and a motor. Background Technology

[0002] In the prior art, in order to achieve higher power and torque density, the stator winding of the vehicle drive motor uses flat copper coils with higher slot fill factor. Since flat copper wire is a shaped winding, when the stator winding adopts different numbers of parallel branches, the stator winding needs to adopt different arrangement methods, which makes the design process complicated and leaves room for improvement. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the aforementioned technical problems in the prior art. To this end, the present invention proposes a motor stator whose stator winding connection method has a wide range of applicability, and the sum of the potentials of each branch distributed on each pole is equal, ensuring that the potentials of each branch are equal and avoiding the generation of circulating currents.

[0004] The present invention also proposes a motor having the above-mentioned 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 thereon. Each group of four adjacent stator slots constitutes a stator slot group. The stator winding includes M phases, with each pole and each phase winding occupying one stator slot group. Each phase corresponds to 2P stator slot groups. The ratio of the number of stator slots in the stator core to the number of motor poles is Y. The stator winding passes through the plurality of stator slots circumferentially along the stator core and forms 2P×N conductor layers radially along 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. Each flat wire has a crown end and a solder end. The solder end of the pin of the 2k-1th conductor layer of one flat wire inserted into the m-th stator slot of the a-th stator slot group is connected to the solder end of the pin of the 2kth conductor layer of another flat wire inserted into the m-th stator slot of the a+1-th stator slot group. The flat wires can be divided into:

[0007] The first flat wire has two leads inserted into the 2kth conductor layer and the 2k+1th conductor layer of the stator slot, and the pitch of the first flat wire is Y.

[0008] The second flat wire and the third flat wire are inserted into the 2P×N conductor layer of the stator slot at the same time, and the two pins are respectively inserted into the 2b stator slot group and the 2b-1 stator slot group of the same phase. The second flat wire and the third flat wire are alternately arranged in the 2P×N conductor layer. The pitch of the second flat wire is Y+1 and the pitch of the third flat wire is Y-1.

[0009] The fourth, fifth, and sixth flat wires are inserted into the first conductor layer of the stator slots, respectively, in the 2b and 2b+1th stator slot groups of the same phase. The two leads of the fourth flat wire are inserted into either the first slot or the fourth slot of either of the two stator slot groups, with a pitch of Y. The two leads of the fifth and sixth flat wires are inserted into the second and third slots of the two stator slot groups, respectively, with a pitch of Y+1 and a pitch of Y-1.

[0010] Each phase winding includes P branches, which are connected end to end. In each branch, there is a point where the pin of the flat wire is not connected to the other pin corresponding to its crown end or solder end, so that the two pins form the start and end points of the branch respectively. M, N, P, a, b, m, and k are integers, m≤4, and k≤(P×N).

[0011] According to an embodiment of the present invention, the stator winding connection method of the motor stator has a wide range of applications, and the sum of the distribution of each branch on each pole is equal, ensuring that the potential of each branch is equal and avoiding the generation of circulating current.

[0012] In addition, the motor stator according to the embodiments of the invention may also have the following additional technical features:

[0013] According to some embodiments of the present invention, the lead-in end and lead-out end of the P branches are simultaneously located at the crown end or the welding end of the flat wire, and the pins corresponding to the lead-in end of the P branches are located in the same stator slot and / or the pins corresponding to the lead-out end of the P branches are located in the same stator slot.

[0014] According to some embodiments of the present invention, the lead-in end and the lead-out end of the P branches are simultaneously located at the crown end or the welding end of the flat wire, and the pins corresponding to the lead-in end of the P branches are located in the same conductor layer and / or the pins corresponding to the lead-out end of the P branches are located in the same conductor layer.

[0015] According to some embodiments of the present invention, the flat wire includes: two pins for insertion into the stator slot to form the conductor layer; a crown portion connected between the two pins, the crown portion being convex; wherein, the end of the pin away from the crown portion forms a solder portion.

[0016] According to some embodiments of the present invention, the crown portion 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 weld portion is located on the other side of the outer end of the stator slot.

[0017] According to some embodiments of the present invention, the solder portions on both sides of the first flat wire extend obliquely in a direction away from each other in the extension direction of the pin, the solder portions on both sides of the second and third flat wires extend obliquely in a second direction opposite to the first direction in the extension direction of the pin, and the solder portions on both sides of the fourth, fifth and sixth flat wires extend obliquely in a first direction in the extension direction of the pin.

[0018] According to some embodiments of the present invention, two adjacent flat wires in the winding direction are welded together by the weld portion.

[0019] According to some embodiments of the present invention, the stator winding includes 3 phases, each phase corresponding to 6 stator slots, and each phase winding includes 3 branches.

[0020] According to some embodiments of the present invention, the P branches included in each phase winding can be connected in series or in parallel, or multiple branches can be connected in series and then in parallel.

[0021] According to another aspect of the present invention, the motor includes the motor stator described above. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the stator winding arrangement according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the first flat wire according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the second and third flat wires according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the fourth, fifth, and sixth flat lines according to an embodiment of the present invention.

[0026] Figure label:

[0027] First flat wire 10, second flat wire 20, third flat wire 30, fourth flat wire 40, fifth flat wire 50, sixth flat wire 60, pin 1, solder part 11, crown part 2. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the prior art, in order to achieve higher power and torque density, the stator winding of the vehicle drive motor uses flat copper coils with higher slot fill factor. Since flat copper coils are shaped windings, when each phase of the stator winding adopts a different number of parallel branches, the stator winding needs to adopt different arrangement methods, which makes the design process complicated.

[0031] Therefore, this invention provides a stator winding arrangement that is more widely applicable while ensuring that the sum of the distribution of each branch on each pole is equal. Thus, while ensuring that the potential of each branch is equal and avoiding the generation of circulating current, the design process of the stator winding arrangement for the drive motor is simplified and the design cost is reduced.

[0032] The following is for reference. Figures 1-4 A motor stator according to an embodiment of the present invention is described.

[0033] According to an embodiment of the present invention, the motor stator may include: a stator core and a stator winding.

[0034] Furthermore, the stator core has multiple stator slots arranged circumferentially. Each group of four adjacent stator slots forms a stator slot group. Each pole and each phase winding occupies one stator slot group. In other words, the number of slots per pole and per phase of the motor stator is 4.

[0035] The stator winding includes M phases, each phase corresponding to 2P stator slots. In other words, each phase of the stator winding has P pairs of electrodes. The ratio of the number of stator slots to the number of poles in the stator core is Y. The stator winding passes through multiple stator slots circumferentially along the stator core and forms 2P×N conductor layers radially along the stator core.

[0036] Each corresponding stator slot group is arranged along a first direction, which can be clockwise (e.g., ...). Figure 1 (as shown in the OA direction) or counterclockwise direction (e.g.) Figure 1 (as shown in the OB direction), and arrange the four stator slots in each stator slot group along the first direction, namely the first slot, the second slot, the third slot and the fourth slot.

[0037] The stator winding includes several flat wires inserted into the stator slots of the stator core. Each flat wire includes two connected pins 1. The flat wire is formed in a "U" shape and has a crown end and a welded end. The end where the two pins 1 are connected to each other is the crown end, and the other end is the welded end.

[0038] Furthermore, the flat lines can be divided into: the first flat line 10, the second flat line 20, the third flat line 30, the fourth flat line 40, the fifth flat line 50, and the sixth flat line 60.

[0039] The two pins 1 of the first flat wire 10 are respectively inserted into the 2kth conductor layer and the 2k+1th conductor layer of the stator slot. The pitch of the first flat wire 10 is Y. The welding end of the pin 1 of the flat wire in the same phase inserted into 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 the flat wire inserted into the 2kth conductor layer of the mth stator slot of the a+1th stator slot group.

[0040] Thus, all the first flat wires 10 are interconnected to form 8P parallel and non-intersecting coil units within a phase. These coil units extend from the second conductor layer in the stator slot to a 2P×N-1 conductor layer within the stator slot. Specifically, the pin 1 of the first flat wire 10 located in the second conductor layer within each stator slot forms the first end of the coil unit, and the pin 1 of the first flat wire 10 located in the 2P×N-1 conductor layer within each stator slot forms the second end of the coil unit.

[0041] The two pins 1 of the second flat wire 20 and the third flat wire 30 are simultaneously inserted into the 2P×Nth 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 second flat wire 20 and the third flat wire 30 are alternately arranged in the 2P×Nth conductor layer. The pitch of the second flat wire 20 is Y+1, and the pitch of the third flat wire 30 is Y-1.

[0042] The soldering end of pin 1 of a flat wire inserted in the mth stator slot of the a-th stator slot group, located in the same phase, is connected to the soldering end of pin 1 of the mth stator slot of another flat wire inserted in the a+1-th stator slot group, located in the m ...

[0043] Thus, a second flat wire 20 connects the coil unit with the second end located in the first slot of the second stator slot group and the coil unit with the second end located in the second slot of the second stator slot group to form the first short branch.

[0044] Another second flat wire 20 connects the coil unit of the 2P×N-1 conductor layer located in the third slot of the 2b-1 stator slot group with the coil unit of the 2P×N-1 conductor layer located in the fourth slot of the 2b stator slot group, forming a second short branch.

[0045] A third flat wire 30 connects the coil unit with the second end located in the second slot of the second stator slot group 2P×N-1 conductor layer to the coil unit with the second end located in the first slot of the second stator slot group 2b, forming a third short branch.

[0046] Another third flat wire 30 connects the coil unit of the 2P×N-1 conductor layer located in the fourth slot of the 2b-1 stator slot group with the coil unit of the 2P×N-1 conductor layer located in the third slot of the 2b stator slot group, forming a fourth short branch.

[0047] In other words, after all the first flat wires 10, the second flat wires 20 and the third flat wires 30 are interconnected, they form 4P non-intersecting short branches in one phase. These short branches extend from the second conductor layer in the stator slot to the 2P×N-1 conductor layer in the stator slot, turn after passing the second flat wire 20 or the third flat wire 30 located in the 2P×N conductor layer, and then return to the second conductor layer from the 2P×N-1 conductor layer in the stator slot.

[0048] In this circuit, the pin 1 of the first flat wire 10 of the second conductor layer of the first slot in the 2b+1st stator slot group forms the first end of the first short branch, and the pin 1 of the first flat wire 10 of the second conductor layer of the second slot in the 2b+2nd stator slot group forms the second end of the first short branch.

[0049] The pin 1 of the first flat wire 10 of the second conductor layer of the third slot in the 2b+1 stator slot group forms the first end of the second short branch, and the pin 1 of the first flat wire 10 of the second conductor layer of the fourth slot in the 2b+2 stator slot group forms the second end of the second short branch.

[0050] The pin 1 of the first flat wire 10 of the second conductor layer of the second slot in the 2b+1 stator slot group forms the first end of the third short branch, and the pin 1 of the first flat wire 10 of the second conductor layer of the first slot in the 2b+2 stator slot group forms the second end of the third short branch.

[0051] The pin 1 of the first flat wire 10 of the second conductor layer of the fourth slot in the 2b+1 stator slot group forms the first end of the fourth short branch, and the pin 1 of the first flat wire 10 of the second conductor layer of the third slot in the 2b+2 stator slot group forms the second end of the fourth short branch.

[0052] The two pins 1 of the fourth flat wire 40, the fifth flat wire 50, and the sixth flat wire 60 are simultaneously inserted into the first conductor layer position of the stator slot and are respectively located in the 2b and 2b+1 stator slot groups of the same phase. The two pins 1 of the fourth flat wire 40 are inserted into the first slot of the two stator slot groups or the fourth slot of the two stator slot groups. The pitch of the fourth flat wire 40 is Y. The two pins 1 of the fifth flat wire 50 and the sixth flat wire 60 are respectively inserted into the second and third slots of the two stator slot groups. The pitch of the fifth flat wire 50 is Y+1, and the pitch of the sixth flat wire 60 is Y-1.

[0053] The soldering end of pin 1 of a flat wire inserted in the mth stator slot of the a-th stator slot group, located in the same phase, is connected to the soldering end of pin 1 of the mth stator slot of another flat wire inserted in the a+1-th stator slot group, located in the m ...

[0054] Thus, a fourth flat wire 40 connects the first short branch of the second conductor layer of the first slot in the first slot of the 2b+1 stator slot group to the third short branch of the second conductor layer of the first slot in the 2b+2 stator slot group.

[0055] Another fourth flat wire 40 connects the fourth short branch of the second conductor layer of the fourth slot in the 2b+1 stator slot group at the first end to the second short branch of the second conductor layer of the fourth slot in the 2b+2 stator slot group at the second end in series.

[0056] The fifth flat wire 50 connects the third short branch of the second conductor layer of the second slot in the 2b+1 stator slot group at its first end in series with the fourth short branch of the second conductor layer of the third slot in the 2b+2 stator slot group at its second end in series. The sixth flat wire 60 connects the second short branch of the second conductor layer of the third slot in the 2b+1 stator slot group at its first end in series with the first short branch of the second conductor layer of the second slot in the 2b+2 stator slot group at its second end in series.

[0057] In other words, the second end of the first short branch is connected to the first end of the second short branch via the sixth flat line 60, the second end of the second short branch is connected to the first end of the fourth short branch via the fourth flat line 40, the second end of the fourth short branch is connected to the first end of the third short branch via the fifth flat line 50, and the second end of the third short branch is connected to the first end of the first short branch via the fourth flat line 40.

[0058] Thus, the fourth flat line 40, the fifth flat line 50, and the sixth flat line 60 connect the four adjacent short branches in sequence, forming a loop branch that is connected end to end.

[0059] Where M, N, P, a, b, c, m, and k are integers, m ≤ 4, and k ≤ (P × N).

[0060] In summary, through the above arrangement, each phase winding forms P interconnected loop branches. Each branch has a break point located at the crown end or weld end of the flat wire. The pins 1 at both ends of this break point respectively form the start and end points of the branch. In other words, at any point in each branch, pin 1 of the flat wire is not connected to the other pin 1 corresponding to its crown end or weld end, so that the two pins 1 respectively form the start and end points of the branch.

[0061] In some embodiments, the start and end points of the branch can be formed at the welding end of the flat wire, wherein the pin 1 of the flat wire corresponding to the v-th branch is inserted into the 2v+x and 2v+x+1 stator slot groups of the x-th conductor layer. The pin 1 of the flat wire inserted into the m-th slot of the 2v+2y-th stator slot group of the 2y-th conductor layer is formed as one of the start and end points of the v-th branch, and the pin 1 of the flat wire inserted into the m-th slot of the 2v+2y-1-th stator slot group of the 2y-1-th conductor layer is formed as the other of the start and end points of the v-th branch; or, the pin 1 of the flat wire inserted into the m-th slot of the 2v+2y+1-th stator slot group of the 2y-th conductor layer is formed as one of the start and end points of the v-th branch, and the pin 1 of the flat wire inserted into the m-th slot of the 2v+2y-1-th stator slot group of the 2y-1-th conductor layer is formed as the other of the start and end points of the v-th branch. v, x, and y are integers, where v ≤ P, x ≤ 2P × N, and y ≤ P × N.

[0062] In other embodiments, the start and end points of the branch can be formed at the crown end of the flat line, and the crown end of any one of the flat lines corresponding to the branch can be disconnected.

[0063] In other words, each phase winding includes P branches, and the branches are connected end to end. In each branch, there is a point where pin 1 of the flat wire is not connected to another pin 1 corresponding to its crown end or solder end, so that the two pins 1 form the start and end points of the vth branch respectively.

[0064] For example, when P=3 and N=1, each phase winding forms three ring branches connected end to end through the above arrangement of flat wires.

[0065] The pin 1 of the flat wire corresponding to the first branch is inserted into the 3rd and 4th stator slots of the 1st conductor layer, the 4th and 5th stator slots of the 2nd conductor layer, the 5th and 6th stator slots of the 3rd conductor layer, the 6th and 7th stator slots of the 4th conductor layer (the 7th stator slot is also the 1st stator slot), the 7th and 8th stator slots of the 5th conductor layer (the 8th stator slot is also the 2nd stator slot), and the 8th and 9th stator slots of the 6th conductor layer (the 9th stator slot is also the 3rd stator slot).

[0066] The pin 1 of the flat wire corresponding to the second branch is inserted into the 5th and 6th stator slot groups of the 1st conductor layer, the 6th and 1st stator slot groups of the 2nd conductor layer, the 1st and 2nd stator slot groups of the 3rd conductor layer, the 2nd and 3rd stator slot groups of the 4th conductor layer, the 3rd and 4th stator slot groups of the 5th conductor layer, and the 4th and 5th stator slot groups of the 6th conductor layer.

[0067] The pin 1 of the flat wire corresponding to the third branch is inserted into the first and second stator slot groups of the first conductor layer, the second and third stator slot groups of the second conductor layer, the third and fourth stator slot groups of the third conductor layer, the fourth and fifth stator slot groups of the fourth conductor layer, the fifth and sixth stator slot groups of the fifth conductor layer, and the sixth and first stator slot groups of the sixth conductor layer.

[0068] The starting and ending points of the three branches can be formed simultaneously at the welding ends of the flat wires. In the first branch, the welding end of pin 1 of one flat wire inserted in the m slot of the 2+2y stator slot group of the 2y layer conductor layer is not connected to the welding end of pin 1 of another flat wire inserted in the m slot of the 2+2y-1 stator slot group of the 2y-1 layer conductor layer. The pins 1 at both ends of the break point form the starting and ending points of the first branch, respectively.

[0069] In the second branch, the soldering end of pin 1 of a flat wire inserted in the m slot of the 4+2y stator slot group of the 2y layer conductor layer is not connected to the soldering end of pin 1 of another flat wire inserted in the m slot of the 4+2y-1 stator slot group of the 2y-1 layer conductor layer. The pins 1 at both ends of the break point form the start and end points of the first branch, respectively.

[0070] In the third branch, the soldering end of pin 1 of a flat wire inserted in the m slot of the 6+2y stator slot group of the 2y layer conductor layer is not connected to the soldering end of pin 1 of another flat wire inserted in the m slot of the 6+2y-1 stator slot group of the 2y-1 layer conductor layer. The pins 1 at both ends of the break point form the start and end points of the first branch, respectively.

[0071] The start and end points of the three branches can be formed simultaneously at the crown end of the flat wire. If the crown end of any flat wire in a branch is broken, the pins 1 at both ends of the break point will form the start and end points of the branch, respectively.

[0072] For example, in the first branch, the soldering end of the pin 1 of the flat wire in the first slot of the fourth stator slot group inserted in the second conductor layer is not connected to the pin 1 of the flat wire in the first slot of the third stator slot group inserted in the first conductor layer. The soldering end of the pin 1 of the flat wire in the first slot of the fourth stator slot group inserted in the second conductor layer forms the starting point of the first branch, and the soldering end of the pin 1 of the flat wire in the first slot of the third stator slot group inserted in the first conductor layer forms the ending point of the first branch.

[0073] For example, in the first branch, the crown end of the flat wire with two pins 1 inserted in the third slot of the sixth stator slot group of the second conductor layer of the stator slot and the third slot of the first stator slot group of the third conductor layer of the stator slot is disconnected. The crown end of the pin 1 of the flat wire inserted in the third slot of the sixth stator slot group of the second conductor layer of the stator slot forms the starting point of the first branch, and the crown end of the pin 1 of the flat wire inserted in the third slot of the third conductor layer of the first stator slot group forms the ending point of the first branch.

[0074] There are multiple starting and ending points on the first branch road, which will not be specified here.

[0075] In other embodiments, there may be multiple equidistant breakpoints on the connected branches to form multiple branches, and the two ends of the breakpoints respectively form the start or end point of any two branches.

[0076] The above stator winding arrangement can be applied to situations where stator windings are difficult to arrange, such as when there are 4 slots per pole per phase and 3 branches. This arrangement has a wider range of applications, is more convenient for motor stator design, and reduces production costs.

[0077] According to an embodiment of the present invention, the stator winding connection method of the motor stator has a wide range of applications, and the sum of the distribution of each branch on each pole is equal, ensuring that the potential of each branch is equal and avoiding the generation of circulating current.

[0078] According to some embodiments of the present invention, such as Figure 1As shown, the lead-in and lead-out ends of the P branches are located at the crown end or welding end of the flat wire to facilitate the connection between the branches and the overall arrangement of the motor.

[0079] Furthermore, in some embodiments, the pin 1 corresponding to the input end of the P branches is located in the same stator slot and / or the pin 1 corresponding to the output end of the P branches is located in the same stator slot. This makes the overall structure of the motor more regular, facilitates motor manufacturing, and allows the input and output ends to be closer together, facilitating series or parallel connections between branches.

[0080] In some embodiments, the lead-in and lead-out ends of the P branches are located at the welding ends of the flat wire, and the pins 1 corresponding to the lead-in ends of the P branches are located in the same stator slot, and the pins 1 corresponding to the lead-out ends of the P branches are also located in the same stator slot.

[0081] For example, when P=3 and N=1, each phase winding forms three ring branches connected end to end through the above arrangement of flat wires.

[0082] The inlet of the three branches can be located simultaneously in the first slot of the first stator slot group, and the outlet of the three branches can be located simultaneously in the first slot of the second stator slot group. At this time, the soldering end of the pin 1 of the flat wire inserted into the first conductor layer of the first slot of the first stator slot group forms the inlet of the first branch, the soldering end of the pin 1 of the flat wire inserted into the third conductor layer of the first slot of the first stator slot group forms the inlet of the second branch, and the soldering end of the pin 1 of the flat wire inserted into the fifth conductor layer of the first slot of the first stator slot group forms the inlet of the third branch.

[0083] Furthermore, the soldering end of the pin 1 of the flat wire in the second conductor layer of the first slot of the second stator slot group is formed as the lead-out end of the first branch, the soldering end of the pin 1 of the flat wire in the fourth conductor layer of the first slot of the second stator slot group is formed as the lead-out end of the second branch, and the soldering end of the pin 1 of the flat wire in the sixth conductor layer of the first slot of the second stator slot group is formed as the lead-out end of the third branch.

[0084] In other embodiments, the lead-in and lead-out ends of the P branches are located at the welding ends of the flat wire, the pins 1 corresponding to the lead-in ends of the P branches are located in the same stator slot, and the pins 1 corresponding to the lead-out ends of the P branches are located in two different stator slots, or the pins 1 corresponding to the lead-out ends of the P branches are located in the same stator slot, and the pins 1 corresponding to the lead-in ends of the P branches are located in two different stator slots.

[0085] For example, when P=3 and N=1, each phase winding forms three ring branches connected end to end through the above arrangement of flat wires.

[0086] The inlet of the three branches can be located simultaneously in the second slot of the second stator slot group, and the outlet of the three branches can be located in the second slot of the third stator slot group and the second slot of the first stator slot group, respectively.

[0087] For example, the soldering end of the pin 1 of the flat wire in the first conductor layer of the second slot of the second stator slot group is formed as the inlet end of the first branch; the soldering end of the pin 1 of the flat wire in the fourth conductor layer of the second slot of the second stator slot group is formed as the inlet end of the second branch; and the soldering end of the pin 1 of the flat wire in the fifth conductor layer of the second slot of the second stator slot group is formed as the inlet end of the third branch.

[0088] Furthermore, the soldering end of the pin 1 of the flat wire inserted into the second conductor layer of the second slot of the third stator slot group is formed as the lead-out end of the first branch, the soldering end of the pin 1 of the flat wire inserted into the third conductor layer of the second slot of the first stator slot group is formed as the lead-out end of the second branch, and the soldering end of the pin 1 of the flat wire inserted into the sixth conductor layer of the second slot of the third stator slot group is formed as the lead-out end of the third branch.

[0089] In some embodiments, the lead-in and lead-out ends of the P branches are located at the crown end of the flat wire, and the pin 1 corresponding to the lead-in end of the P branches is located in the same stator slot. At this time, the pin 1 corresponding to the lead-out end of the P branches is located in the same or different stator slots depending on the different flat wires that are disconnected.

[0090] In other embodiments, the lead-in and lead-out ends of the P branches are located at the crown end of the flat wire. The pin 1 corresponding to the lead-in end of the P branches is located in the same stator slot, and the pin 1 corresponding to the lead-out end of the P branches is also located in the same stator slot. For example, in a branch, the crown end of a flat wire with two pins 1 respectively inserted into the 2b stator slot group and the 2b+1 stator slot group of the same phase and simultaneously inserted into the first slot or the fourth slot of the corresponding stator slot group is disconnected. The lead wire portions on both sides of the break point are formed as the lead-in and lead-out ends of the branch, so that the pin 1 corresponding to the lead-in and lead-out ends of each branch is located in the same stator slot.

[0091] For example, when P=3 and N=1, each phase winding forms three ring branches connected end to end through the above arrangement of flat wires.

[0092] In this branch, the crown ends of the flat wires of two pins 1 in the fourth slot of the fourth stator slot group and the fourth slot of the fifth stator slot group are disconnected. The crown end of the first conductor layer of the pin 1 in the fourth slot of the fourth stator slot group forms the inlet end of the first branch, the crown end of the pin 1 in the second conductor layer of the fourth slot of the fourth stator slot group forms the inlet end of the second branch, and the crown end of the pin 1 in the fourth conductor layer of the fourth slot of the fourth stator slot group forms the inlet end of the third branch.

[0093] Furthermore, the crown end of pin 1 of the first conductor layer of the fourth slot in the fifth stator slot group is formed as the lead-out end of the first branch, the crown end of pin 1 of the third conductor layer of the fourth slot in the fifth stator slot group is formed as the lead-out end of the second branch, and the crown end of pin 1 of the fifth conductor layer of the fourth slot in the fifth stator slot group is formed as the lead-out end of the third branch.

[0094] In some embodiments, the lead-in and lead-out ends of the P branches are located at the crown end of the flat wire, the pin 1 corresponding to the lead-in end of the P branches is located in the same stator slot, and the pin 1 corresponding to the lead-out end of the P branches is located in different stator slots.

[0095] For example, in a branch, there is a flat wire with two pins 1 respectively inserted into the 2bth stator slot group and the 2b+1th stator slot group of the same phase, and a flat wire with one pin 1 inserted into the second or third slot of the 2bth stator slot group has its crown end broken. The lead wires on both sides of the break point form the inlet and outlet of the branch. At this time, the pins 1 corresponding to the inlet of each branch are located in the same stator slot, and the pins 1 corresponding to the outlet of each branch are located in different stator slots.

[0096] For example, when P=3 and N=1, each phase winding forms three ring branches connected end to end through the above arrangement of flat wires.

[0097] In this branch, the crown ends of the flat wires of two pins 1 in the second slot of the fourth stator slot group and the second or third slot of the fifth stator slot group are disconnected. The crown end of the pin 1 in the first conductor layer of the second slot of the fourth stator slot group forms the inlet end of the first branch, the crown end of the pin 1 in the second conductor layer of the second slot of the fourth stator slot group forms the inlet end of the second branch, and the crown end of the pin 1 in the fourth conductor layer of the second slot of the fourth stator slot group forms the inlet end of the third branch.

[0098] Furthermore, the crown end of pin 1 of the first conductor layer in the third slot of the fifth stator slot group is formed as the lead-out end of the first branch, the crown end of pin 1 of the third conductor layer in the second slot of the fifth stator slot group is formed as the lead-out end of the second branch, and the crown end of pin 1 of the fifth conductor layer in the second slot of the fifth stator slot group is formed as the lead-out end of the third branch.

[0099] For example, in a branch, the crown end of a flat wire with two pins 1 respectively inserted into the 2b and 2b-1 stator slots of the same phase is broken, and one pin 1 of the flat wire is located in the same stator slot. The lead portion on both sides of the break point is formed as the lead-in end and lead-out end of the branch, so that the pin 1 corresponding to the lead-in end of each branch is located in the same stator slot.

[0100] For example, when P=3 and N=1, each phase winding forms three ring branches connected end to end through the above arrangement of flat wires.

[0101] Among them, two pins 1 of the three branches are respectively inserted into the third slot of the fourth stator slot group and the crown end of the flat wire of the third stator slot group is disconnected. The crown end of the third conductor layer of the pin 1 located in the third slot of the fourth stator slot group forms the introduction end of the first branch, the crown end of the pin 1 located in the fifth conductor layer of the third slot of the fourth stator slot group forms the introduction end of the second branch, and the crown end of the pin 1 located in the sixth conductor layer of the third slot of the fourth stator slot group forms the introduction end of the third branch.

[0102] Furthermore, the crown end of pin 1 of the second conductor layer of the third slot in the third stator slot group is formed as the lead-out end of the first branch, the crown end of pin 1 of the fourth conductor layer of the third slot in the third stator slot group is formed as the lead-out end of the second branch, and the crown end of pin 1 of the sixth conductor layer of the fourth slot in the third stator slot group is formed as the lead-out end of the third branch.

[0103] According to other embodiments of the present invention, the lead-in end and lead-out end of the P branches are located at the crown end or welding end of the flat wire, so as to facilitate the connection between the branches and the overall arrangement of the motor.

[0104] Furthermore, the pin 1 corresponding to the input end of each of the P branches is located on the same conductor layer and / or the pin 1 corresponding to the output end of each of the P branches is located on the same conductor layer. This makes the overall structure of the motor more regular, facilitates motor manufacturing, and allows the input and output ends to be positioned closer together, facilitating series or parallel connections between branches.

[0105] In some embodiments, the lead-in and lead-out ends of the P branches are located at the soldering ends of the flat wire. The pin 1 corresponding to the lead-in ends of the P branches is located on the same conductor layer, and the pin 1 corresponding to the lead-out ends of the P branches is also located on the same conductor layer. The lead-in ends of the P branches may simultaneously be located on the 2y conductor layer, and the lead-out ends of the three branches may simultaneously be located on the 2y-1 conductor layer.

[0106] In other embodiments, the lead-in and lead-out ends of the P branches are located at the crown end of the flat wire, and the pin 1 corresponding to the lead-in end of the P branches and the pin 1 corresponding to the lead-out end of the P branches are simultaneously located on the same conductor layer. The lead-in and lead-out ends of the P branches can be simultaneously located on the first conductor layer, or simultaneously located on the second P×N conductor layer. In this case, the crown end of one second flat wire 20 or third flat wire 30 in each branch is disconnected, or the crown end of one fourth flat wire 40, fifth flat wire 50, or sixth flat wire 60 in each branch is disconnected, so that the two pins 1 of the flat wire respectively form the start and end points of the branch.

[0107] In some embodiments, the lead-in and lead-out ends of the P branches are located at the crown end of the flat wire, and the pin 1 corresponding to the lead-in end of the P branches and the pin 1 corresponding to the lead-out end of the P branches are simultaneously located in two adjacent conductor layers. Specifically, the lead-in ends of the P branches can be simultaneously located in the 2y conductor layer, and the lead-out ends of the P branches can be simultaneously located in the 2y+1 conductor layer. In this case, the crown end of the first flat wire 10 in each branch, where two pins 1 are located in the 2y conductor layer and the 2y+1 conductor layer respectively, is disconnected, so that the two pins 1 of the flat wire form the start and end points of the branch respectively.

[0108] Reference Figures 2-4 The flat wire includes two pins 1 and a crown portion 2. The pins 1 are used to insert into the stator slot to form a conductor layer. The crown portion 2 is connected between the two pins 1 and is convex, which facilitates the arrangement and installation of the flat wire. The end of the pin 1 away from the crown portion 2 forms a solder portion 11, which is located at the solder end of the flat wire. The crown portion 2 is located at the crown end of the flat wire.

[0109] 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 stator slot outer end of the stator core, and the welding portion 11 is located on the other side of the stator slot outer end, so as to make the overall structure of the stator winding more regular and facilitate the installation and welding of the stator winding.

[0110] like Figure 2 As shown, the welding portions 11 on both sides of the first flat wire 10 extend obliquely in the extension direction of the pin 1 in a direction away from each other, so as to weld the welding portion 11 on one side to the welding portion 11 of the pin 1 in the stator slot group adjacent to that side.

[0111] Reference Figure 3 The welding portions 11 of the second flat wire 20 and the third flat wire 30 on both sides extend obliquely in the extension direction of the pin 1 in a second direction opposite to the first direction, so that the stator winding can be turned in the second direction by means of the second flat wire 20.

[0112] like Figure 4 As shown, the welding portions 11 of the fourth flat wire 40, the fifth flat wire 50 and the sixth flat wire 60 on both sides extend obliquely in the first direction in the extension direction of the pin 1, so that the stator winding can be turned in the first direction by using the third flat wire 30 and the fourth flat wire 40.

[0113] In some embodiments, two adjacent flat wires in the winding direction are welded together by a welding part 11 to facilitate the installation of the stator winding.

[0114] According to some embodiments of the present invention, the P branches included in each phase winding can be connected in series or in parallel, or multiple branches can be connected in series and then in parallel, so as to make this stator winding arrangement more versatile.

[0115] According to some embodiments of the present invention, such as Figure 1 As shown, the stator winding includes 3 phases, each phase has 6 stator slots, and each phase winding includes 3 branches. Through the above arrangement of the stator winding, it is possible to achieve one phase with three branches when the number of slots per pole and each phase is 4.

[0116] according to Figure 1 A specific embodiment of the present invention is described.

[0117] like Figure 1 As shown, the stator core has 72 stator slots arranged circumferentially. Every four adjacent stator slots form a stator slot group. The stator winding includes 3 phases, with 6 stator slot groups corresponding to each phase. The stator winding passes through multiple stator slots along the circumference of the stator core and forms 6 conductor layers along the radial direction of the stator core. Each phase winding includes 3 branches.

[0118] like Figure 1 As shown, taking one phase as an example, the arrangement of the three branches of that phase in the stator slot is described.

[0119] The two pins 1 of the 24th flat wire of the first branch are inserted into the second conductor layer of the second slot of the second stator slot group and the third conductor layer of the second slot of the third stator slot group. This flat wire is the first flat wire 10.

[0120] The two pins 1 of the 23rd flat wire of the first branch are inserted into the fourth conductor layer of the second slot of the fourth stator slot group and the fifth conductor layer of the second slot of the fifth stator slot group. This flat wire is the first flat wire 10.

[0121] The two pins 1 of the 22nd flat wire of the first branch are inserted into the 6th conductor layer of the second slot of the 6th stator slot group and the 6th conductor layer of the first slot of the 1st stator slot group. This flat wire is the third flat wire 30.

[0122] The two pins 1 of the 21st flat wire of the first branch are inserted into the fifth conductor layer of the first slot of the sixth stator slot group and the fourth conductor layer of the first slot of the fifth stator slot group. This flat wire is the first flat wire 10.

[0123] The two pins 1 of the 20th flat wire of the first branch are inserted into the third conductor layer of the first slot of the fourth stator slot group and the second conductor layer of the first slot of the third stator slot group. This flat wire is the first flat wire 10.

[0124] The two pins 1 of the 19th flat wire of the first branch are inserted into the first conductor layer of the first slot of the second stator slot group and the first conductor layer of the first slot of the first stator slot group. This flat wire is the fourth flat wire 40.

[0125] The two pins 1 of the 18th flat wire of the first branch are inserted into the second conductor layer of the first slot of the second stator slot group and the third conductor layer of the first slot of the third stator slot group. This flat wire is the first flat wire 10.

[0126] The two pins 1 of the 17th flat wire of the first branch are inserted into the fourth conductor layer of the first slot of the fourth stator slot group and the fifth conductor layer of the first slot of the fifth stator slot group. This flat wire is the first flat wire 10.

[0127] The two pins 1 of the 16th flat wire of the first branch are inserted into the 6th conductor layer of the first slot of the 6th stator slot group and the 6th conductor layer of the second slot of the 1st stator slot group. This flat wire is the second flat wire 20.

[0128] The two pins 1 of the 15th flat wire of the first branch are inserted into the 5th conductor layer of the second slot of the 6th stator slot group and the 4th conductor layer of the second slot of the 5th stator slot group. This flat wire is the first flat wire 10.

[0129] The two pins 1 of the 14th flat wire of the first branch are inserted into the third conductor layer of the second slot of the fourth stator slot group and the second conductor layer of the second slot of the third stator slot group. This flat wire is the first flat wire 10.

[0130] The two pins 1 of the 13th flat wire of the first branch are inserted into the first conductor layer of the second slot of the second stator slot group and the first conductor layer of the third slot of the first stator slot group. This flat wire is the sixth flat wire 60.

[0131] The two pins 1 of the 12th flat wire of the first branch are inserted into the second conductor layer of the third slot of the second stator slot group and the third conductor layer of the third slot of the third stator slot group. This flat wire is the first flat wire 10.

[0132] The two pins 1 of the 11th flat wire of the first branch are inserted into the fourth conductor layer of the third slot of the fourth stator slot group and the fifth conductor layer of the third slot of the fifth stator slot group. This flat wire is the first flat wire 10.

[0133] The two pins 1 of the 10th flat wire of the first branch are inserted into the 6th conductor layer of the third slot of the 6th stator slot group and the 6th conductor layer of the fourth slot of the 1st stator slot group. This flat wire is the second flat wire 20.

[0134] The two pins 1 of the 9th flat wire of the first branch are inserted into the 5th conductor layer of the 4th slot of the 6th stator slot group and the 4th conductor layer of the 4th slot of the 5th stator slot group. This flat wire is the first flat wire 10.

[0135] The two pins 1 of the 8th flat wire of the first branch are inserted into the 3rd conductor layer of the 4th slot of the 4th stator slot group and the 2nd conductor layer of the 4th slot of the 3rd stator slot group. This flat wire is the first flat wire 10.

[0136] The two pins 1 of the 7th flat wire of the first branch are inserted into the first conductor layer of the fourth slot of the second stator slot group and the first conductor layer of the fourth slot of the first stator slot group. This flat wire is the fourth flat wire 40.

[0137] The two pins 1 of the 6th flat wire of the first branch are inserted into the 2nd conductor layer of the 4th slot of the 2nd stator slot group and the 3rd conductor layer of the 4th slot of the 3rd stator slot group. This flat wire is the first flat wire 10.

[0138] The two pins 1 of the fifth flat wire of the first branch are inserted into the fourth conductor layer of the fourth slot of the fourth stator slot group and the fifth conductor layer of the fourth slot of the fifth stator slot group. This flat wire is the first flat wire 10.

[0139] The two pins 1 of the fourth flat wire of the first branch are inserted into the sixth conductor layer of the fourth slot of the sixth stator slot group and the sixth conductor layer of the third slot of the first stator slot group. This flat wire is the third flat wire 30.

[0140] The two pins 1 of the third flat wire of the first branch are inserted into the fifth conductor layer of the third slot of the sixth stator slot group and the fourth conductor layer of the third slot of the fifth stator slot group. This flat wire is the first flat wire 10.

[0141] The two pins 1 of the second flat wire of the first branch are inserted into the third conductor layer of the third slot of the fourth stator slot group and the second conductor layer of the third slot of the third stator slot group. This flat wire is the first flat wire 10.

[0142] The two pins 1 of the first flat wire of the first branch are inserted into the first conductor layer of the third slot of the second stator slot group and the first conductor layer of the second slot of the first stator slot group. This flat wire is the fifth flat wire 50.

[0143] The flat wires are welded together in sequence. The pin 1 of the 24th flat wire, which is inserted into the second conductor layer of the second slot of the second stator slot group, is not connected to the pin 1 of the 1st flat wire, which is inserted into the first conductor layer of the second slot of the first stator slot group. The welding end of the pin 1 of the 1st flat wire, which is inserted into the first conductor layer of the second slot of the first stator slot group, forms the inlet end of the first branch. The welding end of the pin 1 of the 24th flat wire, which is inserted into the second conductor layer of the second slot of the second stator slot group, forms the outlet end of the first branch.

[0144] The two pins 1 of the 24th flat wire of the second branch are inserted into the first conductor layer of the second slot of the 6th stator slot group and the first conductor layer of the third slot of the 5th stator slot group. This flat wire is the sixth flat wire 60.

[0145] The two pins 1 of the 23rd flat wire of the second branch are inserted into the second conductor layer of the third slot of the sixth stator slot group and the third conductor layer of the third slot of the first stator slot group. This flat wire is the first flat wire 10.

[0146] The two pins 1 of the 22nd flat wire of the second branch are inserted into the fourth conductor layer of the third slot of the second stator slot group and the fifth conductor layer of the third slot of the third stator slot group. This flat wire is the first flat wire 10.

[0147] The two pins 1 of the 21st flat wire of the second branch are inserted into the sixth conductor layer of the third slot of the fourth stator slot group and the sixth conductor layer of the fourth slot of the fifth stator slot group. This flat wire is the second flat wire 20.

[0148] The two pins 1 of the 20th flat wire of the second branch are inserted into the fifth conductor layer of the fourth slot of the fourth stator slot group and the fourth conductor layer of the fourth slot of the third stator slot group. This flat wire is the first flat wire 10.

[0149] The two pins 1 of the 19th flat wire of the second branch are inserted into the third conductor layer of the fourth slot of the second stator slot group and the second conductor layer of the fourth slot of the first stator slot group. This flat wire is the first flat wire 10.

[0150] The two pins 1 of the 18th flat wire of the second branch are inserted into the first conductor layer of the fourth slot of the sixth stator slot group and the first conductor layer of the fourth slot of the fifth stator slot group. This flat wire is the fourth flat wire 40.

[0151] The two pins 1 of the 17th flat wire of the second branch are inserted into the second conductor layer of the fourth slot of the sixth stator slot group and the third conductor layer of the fourth slot of the first stator slot group. This flat wire is the first flat wire 10.

[0152] The two pins 1 of the 16th flat wire of the second branch are inserted into the fourth conductor layer of the fourth slot of the second stator slot group and the fifth conductor layer of the fourth slot of the third stator slot group. This flat wire is the first flat wire 10.

[0153] The two pins 1 of the 15th flat wire of the second branch are inserted into the sixth conductor layer of the fourth slot of the fourth stator slot group and the sixth conductor layer of the third slot of the fifth stator slot group. This flat wire is the third flat wire 30.

[0154] The two pins 1 of the 14th flat wire of the second branch are inserted into the fifth conductor layer of the third slot of the fourth stator slot group and the fourth conductor layer of the third slot of the third stator slot group. This flat wire is the first flat wire 10.

[0155] The two pins 1 of the 13th flat wire of the second branch are inserted into the third conductor layer of the third slot of the second stator slot group and the second conductor layer of the third slot of the first stator slot group. This flat wire is the first flat wire 10.

[0156] The two pins 1 of the 12th flat wire of the second branch are inserted into the first conductor layer of the third slot of the sixth stator slot group and the first conductor layer of the second slot of the fifth stator slot group. This flat wire is the fifth flat wire 50.

[0157] The two pins 1 of the 11th flat wire of the second branch are inserted into the second conductor layer of the second slot of the sixth stator slot group and the third conductor layer of the second slot of the first stator slot group. This flat wire is the first flat wire 10.

[0158] The two pins 1 of the 10th flat wire of the second branch are inserted into the 4th conductor layer of the second slot of the second stator slot group and the 5th conductor layer of the second slot of the third stator slot group. This flat wire is the first flat wire 10.

[0159] The two pins 1 of the 9th flat wire of the second branch are inserted into the 6th conductor layer of the second slot of the 4th stator slot group and the 6th conductor layer of the first slot of the 5th stator slot group. This flat wire is the third flat wire 30.

[0160] The two pins 1 of the 8th flat wire of the second branch are inserted into the 5th conductor layer of the first slot of the 4th stator slot group and the 4th conductor layer of the first slot of the 3rd stator slot group. This flat wire is the first flat wire 10.

[0161] The two pins 1 of the 7th flat wire of the second branch are inserted into the 3rd conductor layer of the first slot of the 2nd stator slot group and the 2nd conductor layer of the first slot of the 1st stator slot group. This flat wire is the first flat wire 10.

[0162] The two pins 1 of the 6th flat wire of the second branch are inserted into the first conductor layer of the first slot of the 6th stator slot group and the first conductor layer of the first slot of the 5th stator slot group. This flat wire is the fourth flat wire 40.

[0163] The two pins 1 of the fifth flat wire of the second branch are inserted into the second conductor layer of the first slot of the sixth stator slot group and the third conductor layer of the first slot of the first stator slot group. This flat wire is the first flat wire 10.

[0164] The two pins 1 of the fourth flat wire of the second branch are inserted into the fourth conductor layer of the first slot of the second stator slot group and the fifth conductor layer of the first slot of the third stator slot group. This flat wire is the first flat wire 10.

[0165] The two pins 1 of the third flat wire of the second branch are inserted into the sixth conductor layer of the first slot of the fourth stator slot group and the sixth conductor layer of the second slot of the fifth stator slot group. This flat wire is the second flat wire 20.

[0166] The two pins 1 of the second flat wire of the second branch are inserted into the fifth conductor layer of the second slot of the fourth stator slot group and the fourth conductor layer of the second slot of the third stator slot group. This flat wire is the first flat wire 10.

[0167] The two pins 1 of the first flat wire of the second branch are inserted into the third conductor layer of the second slot of the second stator slot group and the second conductor layer of the second slot of the first stator slot group. This flat wire is the first flat wire 10.

[0168] The flat wires are welded together in sequence. The pin 1 of the 24th flat wire, which is inserted into the first conductor layer of the second slot of the 6th stator slot group, is not connected to the pin 1 of the 1st flat wire, which is inserted into the second conductor layer of the second slot of the 1st stator slot group. The welding end of the pin 1 of the 1st flat wire, which is inserted into the second conductor layer of the second slot of the 1st stator slot group, forms the inlet end of the second branch. The welding end of the pin 1 of the 24th flat wire, which is inserted into the first conductor layer of the second slot of the 6th stator slot group, forms the outlet end of the second branch.

[0169] The two pins 1 of the 24th flat wire of the third branch are inserted into the third conductor layer of the second slot of the sixth stator slot group and the second conductor layer of the second slot of the fifth stator slot group. This flat wire is the first flat wire 10.

[0170] The two pins 1 of the 23rd flat wire of the third branch are inserted into the first conductor layer of the second slot of the fourth stator slot group and the first conductor layer of the third slot of the third stator slot group. This flat wire is the sixth flat wire 60.

[0171] The two pins 1 of the 22nd flat wire of the third branch are inserted into the second conductor layer of the third slot of the fourth stator slot group and the third conductor layer of the third slot of the fifth stator slot group. This flat wire is the first flat wire 10.

[0172] The two pins 1 of the 21st flat wire of the third branch are inserted into the fourth conductor layer of the third slot of the sixth stator slot group and the fifth conductor layer of the third slot of the first stator slot group. This flat wire is the first flat wire 10.

[0173] The two pins 1 of the 20th flat wire of the third branch are inserted into the 6th conductor layer of the third slot of the second stator slot group and the 6th conductor layer of the fourth slot of the third stator slot group. This flat wire is the second flat wire 20.

[0174] The two pins 1 of the 19th flat wire of the third branch are inserted into the fifth conductor layer of the fourth slot of the second stator slot group and the fourth conductor layer of the fourth slot of the first stator slot group. This flat wire is the first flat wire 10.

[0175] The two pins 1 of the 18th flat wire of the third branch are inserted into the third conductor layer of the fourth slot of the sixth stator slot group and the second conductor layer of the fourth slot of the fifth stator slot group. This flat wire is the first flat wire 10.

[0176] The two pins 1 of the 17th flat wire of the third branch are inserted into the first conductor layer of the fourth slot of the fourth stator slot group and the first conductor layer of the fourth slot of the third stator slot group. This flat wire is the fourth flat wire 40.

[0177] The two pins 1 of the 16th flat wire of the third branch are inserted into the second conductor layer of the fourth slot of the fourth stator slot group and the third conductor layer of the fourth slot of the fifth stator slot group. This flat wire is the first flat wire 10.

[0178] The two pins 1 of the 15th flat wire of the third branch are inserted into the fourth conductor layer of the fourth slot of the sixth stator slot group and the fifth conductor layer of the fourth slot of the first stator slot group. This flat wire is the first flat wire 10.

[0179] The two pins 1 of the 14th flat wire of the third branch are inserted into the sixth conductor layer of the fourth slot of the second stator slot group and the sixth conductor layer of the third slot of the third stator slot group. This flat wire is the third flat wire 30.

[0180] The two pins 1 of the 13th flat wire of the third branch are inserted into the fifth conductor layer of the third slot of the second stator slot group and the fourth conductor layer of the third slot of the first stator slot group. This flat wire is the first flat wire 10.

[0181] The two pins 1 of the 12th flat wire of the third branch are inserted into the third conductor layer of the third slot of the sixth stator slot group and the second conductor layer of the third slot of the fifth stator slot group. This flat wire is the first flat wire 10.

[0182] The two pins 1 of the 11th flat wire of the third branch are inserted into the first conductor layer of the third slot of the fourth stator slot group and the first conductor layer of the second slot of the third stator slot group. This flat wire is the fifth flat wire 50.

[0183] The two pins 1 of the 10th flat wire of the third branch are inserted into the second conductor layer of the second slot of the fourth stator slot group and the third conductor layer of the second slot of the fifth stator slot group. This flat wire is the first flat wire 10.

[0184] The two pins 1 of the 9th flat wire of the third branch are inserted into the 4th conductor layer of the second slot of the 6th stator slot group and the 5th conductor layer of the second slot of the 1st stator slot group. This flat wire is the first flat wire 10.

[0185] The two pins 1 of the 8th flat wire of the third branch are inserted into the 6th conductor layer of the second slot of the 2nd stator slot group and the 6th conductor layer of the first slot of the 3rd stator slot group. This flat wire is the third flat wire 30.

[0186] The two pins 1 of the 7th flat wire of the third branch are inserted into the 5th conductor layer of the first slot of the 2nd stator slot group and the 4th conductor layer of the first slot of the 1st stator slot group. This flat wire is the first flat wire 10.

[0187] The two pins 1 of the 6th flat wire of the third branch are inserted into the 3rd conductor layer of the first slot of the 6th stator slot group and the 2nd conductor layer of the first slot of the 5th stator slot group. This flat wire is the first flat wire 10.

[0188] The two pins 1 of the fifth flat wire of the third branch are inserted into the first conductor layer of the first slot of the fourth stator slot group and the first conductor layer of the first slot of the third stator slot group. This flat wire is the fourth flat wire 40.

[0189] The two pins 1 of the fourth flat wire of the third branch are inserted into the second conductor layer of the first slot of the fourth stator slot group and the third conductor layer of the first slot of the fifth stator slot group. This flat wire is the first flat wire 10.

[0190] The two pins 1 of the third flat wire of the third branch are inserted into the fourth conductor layer of the first slot of the sixth stator slot group and the fifth conductor layer of the first slot of the first stator slot group. This flat wire is the first flat wire 10.

[0191] The two pins 1 of the second flat wire of the third branch are inserted into the sixth conductor layer of the first slot of the second stator slot group and the sixth conductor layer of the second slot of the third stator slot group. This flat wire is the second flat wire 20.

[0192] The two pins 1 of the first flat wire of the third branch are inserted into the fifth conductor layer of the second slot of the second stator slot group and the fourth conductor layer of the second slot of the first stator slot group. This flat wire is the first flat wire 10.

[0193] The flat wires are welded together in sequence. The pin 1 of the 24th flat wire, which is inserted into the third conductor layer of the second slot of the sixth stator slot group, is not connected to the pin 1 of the 1st flat wire, which is inserted into the fourth conductor layer of the second slot of the first stator slot group. The welded end of the pin 1 of the 1st flat wire, which is inserted into the fourth conductor layer of the second slot of the first stator slot group, forms the inlet end of the third branch. The welded end of the pin 1 of the 24th flat wire, which is inserted into the third conductor layer of the second slot of the sixth stator slot group, forms the outlet end of the third branch.

[0194] The motor according to an embodiment of the present invention includes a motor stator according to the above embodiment. By employing the above-described motor stator, the performance of the motor is improved.

[0195] In the description of this 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," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0196] Other aspects of the motor's construction are already known to those skilled in the art and are therefore not described in detail here.

[0197] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions 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 one or more embodiments or examples.

[0198] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A motor stator, characterized in that, The device includes a stator core and stator windings. The stator core has multiple stator slots arranged circumferentially. Every four adjacent stator slots form a stator slot group. The stator windings include M phases, with each pole and each phase winding occupying one stator slot group. Each phase corresponds to 2P stator slot groups. The ratio of the number of stator slots in the stator core to the number of poles of the motor is Y. The stator windings pass through the multiple stator slots circumferentially along the stator core and form 2P×N conductor layers radially along 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. Each flat wire has a crown end and a solder end. The solder end of the pin of the 2k-1th conductor layer of one flat wire inserted into the m-th stator slot of the a-th stator slot group is connected to the solder end of the pin of the 2kth conductor layer of another flat wire inserted into the m-th stator slot of the a+1-th stator slot group. The flat wires can be divided into: The first flat wire has two leads inserted into the 2kth conductor layer and the 2k+1th conductor layer of the stator slot, and the pitch of the first flat wire is Y. The second flat wire and the third flat wire are inserted into the 2P×N conductor layer of the stator slot at the same time, and the two pins are respectively inserted into the 2b stator slot group and the 2b-1 stator slot group of the same phase. The second flat wire and the third flat wire are alternately arranged in the 2P×N conductor layer. The pitch of the second flat wire is Y+1 and the pitch of the third flat wire is Y-1. The fourth, fifth, and sixth flat wires are inserted into the first conductor layer of the stator slots, respectively, in the 2b and 2b+1th stator slot groups of the same phase. The two leads of the fourth flat wire are inserted into either the first slot or the fourth slot of either of the two stator slot groups, with a pitch of Y. The two leads of the fifth and sixth flat wires are inserted into the second and third slots of the two stator slot groups, respectively, with a pitch of Y+1 and a pitch of Y-1. Each phase winding includes P branches, which are connected end to end. In each branch, there is a point where the pin of the flat wire is not connected to the other pin corresponding to its crown end or solder end, so that the two pins form the start and end points of the branch respectively. M, N, P, a, b, m, and k are integers, m≤4, and k≤(P×N).

2. The motor stator as described in claim 1, characterized in that, The lead-in end and lead-out end of the P branches are both located at the crown end or the welding end of the flat wire, and the pins corresponding to the lead-in end of the P branches are located in the same stator slot and / or the pins corresponding to the lead-out end of the P branches are located in the same stator slot.

3. The motor stator as described in claim 1, characterized in that, The lead-in end and lead-out end of the P branches are both located at the crown end or the welding end of the flat wire, and the pins corresponding to the lead-in end of the P branches are located in the same conductor layer and / or the pins corresponding to the lead-out end of the P branches are located in the same conductor layer.

4. The motor stator as described in claim 1, characterized in that, The flat wire includes: Two pins, the pins being inserted into the stator slot to form the conductor layer; A crown portion, which is connected between the two pins, and the crown portion is convex. The pin is formed at the end away from the crown portion, where a solder joint is formed.

5. The motor stator as described in claim 4, characterized in that, The crown portion 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 weld portion is located on the other side of the outer end of the stator slot.

6. The motor stator as described in claim 4, characterized in that, The solder portions on both sides of the first flat wire extend obliquely in a direction away from each other in the extension direction of the pin; the solder portions on both sides of the second and third flat wires extend obliquely in a second direction opposite to the first direction in the extension direction of the pin; and the solder portions on both sides of the fourth, fifth, and sixth flat wires extend obliquely in a first direction in the extension direction of the pin.

7. The motor stator as described in claim 4, characterized in that, The two adjacent flat wires in the winding direction are welded together by the welding part.

8. The motor stator as described in claim 1, characterized in that, The stator winding includes 3 phases, each phase has 6 stator slots, and each phase winding includes 3 branches.

9. The motor stator as described in claim 1, characterized in that, Each phase winding includes P branches that can be connected in series or in parallel, or multiple branches can be connected in series and then in parallel.

10. An electric motor, characterized in that, Includes the motor stator as described in any one of claims 1-9.

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