Motor stator winding, stator and motor

Abstract

The present invention provides a motor stator winding, a stator and a motor, including a multi-phase winding, any one of which includes a plurality of coil groups connected in sequence, and the plurality of coil groups are arranged in sequence along the circumference of the stator core; any one of the coil groups includes a first conductor group, a second conductor group, a third conductor group and a fourth conductor group, the first conductor group is arranged in the radial innermost layer or outermost layer of the stator core, the fourth conductor group is arranged in the radial innermost layer or outermost layer of the stator core, and the first conductor group and the fourth conductor group are arranged in different radial layers of the stator core; along the radial direction of the stator core, except for the innermost layer and the outermost layer, the remaining layers of the stator core where the first conductor group and the fourth conductor group are located are all provided with the third conductor group; along the radial direction of the stator core, each layer where the second conductor group is located is provided with the second conductor group. The beneficial effect of the present invention is that the winding structure adopts a completely symmetrical structure in the magnetic circuit, eliminating the loop current problem caused by the asymmetric structure.

Description

Technical Field

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

[0002] In the prior art, the stator winding includes multiple types of conductors, including U-shaped conductors and S-shaped conductors. The multiple types of conductor coils are inserted into the slots of the stator core in a certain arrangement to form the winding of the required multi-phase motor. There are many types of hairpin coils used in the prior art, and the manufacturing process is complicated, the production cost is high, and the processing efficiency is low. Summary of the invention

[0003] In view of the above problems, the present invention provides a motor stator winding, a stator and a motor to solve the above or other problems existing in the prior art.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a motor stator winding, including a multi-phase winding, any one of which includes a plurality of coil groups connected in sequence, and the plurality of coil groups are arranged in sequence along the circumference of the stator core;

[0005] Any coil group includes a first conductor group, a second conductor group, a third conductor group and a fourth conductor group, wherein the first conductor group and the fourth conductor group are arranged in the same radial layer of the stator core, and the second conductor group and the third conductor group are arranged in two radially adjacent layers of the stator core;

[0006] Along the circumferential direction of the stator core, the fourth conductor group, the first conductor group and the second conductor group are arranged adjacent to each other;

[0007] The first conductor group is arranged at the radial innermost layer or the radial outermost layer of the stator core, the fourth conductor group is arranged at the radial innermost layer or the radial outermost layer of the stator core, and the first conductor group and the fourth conductor group are arranged at different radial layers of the stator core;

[0008] Along the radial direction of the stator core where the first conductor group and the fourth conductor group are located, except for the innermost layer and the outermost layer, all other layers of the stator core are provided with the third conductor group;

[0009] Each layer along the radial direction of the stator core where the second conductor group is located is provided with a second conductor group.

[0010] Further, in any winding, the number of coil groups is the same as the number of parallel branches;

[0011] Any phase winding includes N branches, and the N branches are sequentially connected in parallel along the circumference of the stator core, where N is greater than or equal to 2.

[0012] Furthermore, the first conductor group includes a plurality of first conductors, and the first conductors are full-pitch conductors.

[0013] Furthermore, the pitch of the first conductor is 9, and the number of the first conductors is 3.

[0014] Furthermore, the second conductor group includes a plurality of second conductors, and the second conductors are full-pitch conductors.

[0015] Furthermore, the pitch of the second conductor is 9, and the number of the second conductors is 3.

[0016] Further, the second conductor group includes a plurality of fifth conductors and at least one sixth conductor, the fifth conductor is a long-pitch conductor, and the sixth conductor is a short-pitch conductor.

[0017] Further, the number of the fifth conductors is 2, the number of the sixth conductor is 1, the pitch of the fifth conductor is 10, and the pitch of the sixth conductor is 7.

[0018] Further, the second conductor group includes at least one seventh conductor and a plurality of eighth conductors, the seventh conductor is a long-pitch conductor, and the eighth conductor is a short-pitch conductor.

[0019] Further, the number of the seventh conductor is 1, the number of the eighth conductor is 2, the pitch of the seventh conductor is 11, and the pitch of the eighth conductor is 8.

[0020] Furthermore, the third conductor group includes a plurality of third conductors, and the third conductors are full-pitch conductors.

[0021] Further, the number of the third conductors is three, and the pitch of the third conductors is 9.

[0022] Further, the third conductor group includes a plurality of ninth conductors and at least one tenth conductor, the ninth conductors are long-pitch conductors, and the tenth conductor is a short-pitch conductor.

[0023] Further, the number of the ninth conductors is 2, the number of the tenth conductor is 1, the pitch of the ninth conductor is 10, and the pitch of the tenth conductor is 7.

[0024] Further, the third conductor group includes at least one eleventh conductor and a plurality of twelfth conductors, the eleventh conductor is a long-pitch conductor, and the twelfth conductor is a short-pitch conductor.

[0025] Further, the number of the eleventh conductor is 1, the number of the twelfth conductor is 2, the pitch of the eleventh conductor is 11, and the pitch of the twelfth conductor is 8.

[0026] Further, the fourth conductor group includes a plurality of fourth conductors and at least one thirteenth conductor, the fourth conductors are long-pitch conductors, and the thirteenth conductor is a short-pitch conductor.

[0027] Further, the number of the fourth conductors is 2, the number of the thirteenth conductor is 1, the pitch of the fourth conductors is 10, and the pitch of the thirteenth conductor is 7.

[0028] Further, the fourth conductor group includes at least one fourteenth conductor and a plurality of fifteenth conductors, the fourteenth conductor is a long-pitch conductor, and the fifteenth conductor is a short-pitch conductor.

[0029] Further, the number of the fourteenth conductor is 1, the number of the fifteenth conductor is 2, the pitch of the fourteenth conductor is 11, and the number of the fifteenth conductor is 8.

[0030] Further, the welding ends of the conductors of the first conductor group extend in the same direction along the circumferential direction of the stator core, the welding ends of the conductors of the fourth conductor group extend in the same direction along the circumferential direction of the stator core, and the extending direction of the welding ends of the conductors of the first conductor group is opposite to the extending direction of the welding ends of the conductors of the fourth conductor group;

[0031] The welding ends of the conductors of the second conductor group and the welding ends of the conductors of the third conductor group both extend along the circumferential direction of the stator core, and the extending directions are both opposite to each other.

[0032] Furthermore, the number of radial layers of the stator core is an even number greater than or equal to 4, and the number of radial layers of the stator core is greater than or equal to the number of parallel branches*2.

[0033] Furthermore, in any winding, two welding ends of two adjacent layers of conductors are welded with a full pitch, and the full pitch is 9.

[0034] A motor stator comprises a stator core and the above-mentioned motor stator winding, wherein the motor stator winding is arranged on the stator core.

[0035] A motor comprises the motor stator mentioned above.

[0036] Due to the adoption of the above technical solution, the stator winding has multiple coil groups, the number of coil groups in each phase winding is consistent with the number of parallel branches in the phase winding, and the radial number of layers of the stator core is selected according to the parallel branches, so that the structure of the stator winding adopts a completely symmetrical structure in the magnetic circuit, eliminating the loop current problem caused by the asymmetric structure, the hairpin coils constituting the stator winding are all U-shaped conductors, and the types of the hairpin coils in the stator winding are the same, which simplifies the manufacturing process, reduces the production cost, and improves the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic structural diagram of a stator of some embodiments of the present invention;

[0038] Figure 2 is a schematic structural diagram of a phase winding of some embodiments of the present invention;

[0039] Figure 3 is a schematic structural diagram of a fourth conductor group in some embodiments of the present invention;

[0040] Figure 4 is a schematic structural diagram of a first conductor group in some embodiments of the present invention;

[0041] Figure 5 is a schematic structural diagram of a second conductor group in some embodiments of the present invention;

[0042] Figure 6 is a schematic structural diagram of a third conductor group in some embodiments of the present invention;

[0043] Figure 7 is another structural schematic diagram of the third conductor group in some embodiments of the present invention;

[0044] Figure 8 is another structural schematic diagram of the third conductor group in some embodiments of the present invention;

[0045] Fig. 9 is another structural schematic diagram of a fourth conductor group in some embodiments of the present invention;

[0046] Fig.10 is another structural schematic diagram of the second conductor group in some embodiments of the present invention;

[0047] Fig.11 is another structural schematic diagram of the second conductor group in some embodiments of the present invention;

[0048] Fig.12a This is an expanded view of the plug-in end of a phase winding of the first embodiment of the present invention (part 1);

[0049] Figure 12b 1 is an expanded view of the plug-in end of a phase winding of the first embodiment of the present invention (the second part);

[0050] Fig.13a is an expanded view of a welding end of a phase winding of the first embodiment of the present invention (first part);

[0051] Fig.13b is an expanded view of a welding end of a phase winding of the first embodiment of the present invention (part 2);

[0052] Fig.14a This is an expanded view of the plug-in end of a phase winding of the second embodiment of the present invention (first part);

[0053] Fig.14b It is an expanded view of the plug-in end of a phase winding of the second embodiment of the present invention (the second part);

[0054] Fig.14cIt is an expanded view of the plug-in end of a phase winding of the second embodiment of the present invention (part 3);

[0055] Fig.14d It is an expanded view of the plug-in end of a phase winding of the second embodiment of the present invention (the fourth part);

[0056] Fig.15a is an expanded view of the welding end of a phase winding of the second embodiment of the present invention (first part);

[0057] Fig.15b is an expanded view of the welding end of a phase winding of the second embodiment of the present invention (the second part);

[0058] Fig.15c is an expanded view of the welding end of a phase winding of the second embodiment of the present invention (part 3);

[0059] Fig.15d is a development diagram of the welding end of a phase winding of the second embodiment of the present invention (part 4);

[0060] Fig.16a 1 is an expanded view of the plug-in end of a phase winding of a fourth embodiment of the present invention (part 1);

[0061] Fig.16b 1 is an expanded view of the plug-in end of a phase winding of the fourth embodiment of the present invention (the second part);

[0062] Fig.16c 1 is a development diagram of the plug-in end of a phase winding of a fourth embodiment of the present invention (part 3);

[0063] Fig.17a is an expanded view (first part) of a welding end of a phase winding of a fourth embodiment of the present invention;

[0064] Fig.17b is an expanded view of the welding end of a phase winding of the fourth embodiment of the present invention (part 2);

[0065] Fig.17c is a development diagram of a welding end of a phase winding of a fourth embodiment of the present invention (part 3);

[0066] Fig.18 is a schematic diagram of three parallel branches in the stator winding of some embodiments of the present invention;

[0067] Fig.19 is a schematic diagram of connecting two parallel branches in a stator winding of some embodiments of the present invention;

[0068] Fig. 20 It is a schematic diagram of the connection of four parallel branches in the stator winding of some embodiments of the present invention.

[0069] In the figure:

[0070] 100-1A, the fourth conductor 100-1B, the thirteenth conductor 100-2A, the fourteenth conductor

[0071] 100-2B, the fifteenth conductor 200-1A, the ninth conductor 200-1B, the tenth conductor

[0072] 200-2A, the eleventh conductor 200-2B, the twelfth conductor 300-1A, the fifth conductor

[0073] 300-1B, sixth conductor 300-2A, seventh conductor 300-2B, eighth conductor

[0074] 150, first conductor 250, third conductor 350, second conductor

[0075] 20. Stator core 21. Slot DETAILED DESCRIPTION

[0076] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0077] Figure 1 A schematic diagram of the structure of the stator of some embodiments of the present invention is shown. Some embodiments relate to a motor stator winding, a stator and a motor. The motor stator winding structure adopts a completely symmetrical structure in the magnetic circuit, eliminating the loop current problem caused by the asymmetric structure. The conductors of the stator winding are all U-shaped conductors, which simplifies the manufacturing process, reduces production costs and improves processing efficiency.

[0078] A motor stator winding includes a multi-phase stator winding, such as Figure 2-17c As shown, the multi-phase winding is composed of a plurality of hairpin coils arranged in sequence along the circumference of the stator core 20 according to a certain arrangement rule. Specifically,

[0079] Any phase winding includes N branches, and the N branches are sequentially connected in parallel along the circumference of the stator core 20, wherein N is greater than or equal to 2, and the number of parallel branches is selected according to actual needs;

[0080] Any winding includes a plurality of coil groups connected in sequence, and the plurality of coil groups are arranged in sequence along the circumference of the stator core 20; in any stator winding, the number of coil groups is the same as the number of parallel branches, that is, the number of coil groups is greater than or equal to 2;

[0081] Any coil group includes a first conductor group, a second conductor group, a third conductor group and a fourth conductor group, wherein the first conductor group and the fourth conductor group are arranged in the same radial layer of the stator core 20, and the second conductor group and the third conductor group are arranged in two radially adjacent layers of the stator core 20; along the circumferential direction of the stator core 20, the fourth conductor group, the first conductor group and the second conductor group are arranged adjacent to each other, and the fourth conductor group, the first conductor group and the second conductor group may be arranged adjacent to each other in sequence, or the first conductor group, the second conductor group and the fourth conductor group may be arranged adjacent to each other in sequence, or the second conductor group, the fourth conductor group and the first conductor group may be arranged adjacent to each other in sequence, and the selection is made according to actual needs; wherein the number of the second conductor groups is at least one group, and may be multiple groups, and the multiple groups of second conductor groups are arranged in sequence along the circumference of the stator core 20, each group of the second conductor group is located in a radial direction of the stator core, and the multiple second conductor groups are located in multiple radial directions of the stator core, such as, if the number of the second conductor groups is two groups, then the fourth conductor group, the first conductor group, the second conductor group, and the second conductor group are arranged adjacent to each other in sequence.

[0082] The first conductor group is arranged at the radial innermost layer or outermost layer of the stator core 20, and the fourth conductor group is arranged at the radial innermost layer or outermost layer of the stator core 20. The first conductor group and the fourth conductor group are arranged at different radial layers of the stator core 20. The first conductor group is arranged at the radial innermost layer of the stator core 20, and the fourth conductor group is arranged at the radial outermost layer of the stator core 20. Alternatively, the first conductor group is arranged at the radial outermost layer of the stator core 20, and the first conductor group is arranged at the radial innermost layer of the stator core 20. The selection is made according to actual needs.

[0083] Along the radial direction of the stator core 20 where the first conductor group and the fourth conductor group are located, except for the innermost layer and the outermost layer, the remaining layers of the stator core 20 are all provided with the third conductor group. For example, if the first conductor group is provided in the outermost layer, then in the other layers along the radial direction of the stator core 20 where the first conductor group is located, except for the innermost layer, every two adjacent layers in the other layers are provided with the third conductor group; if the fourth conductor group is provided in the innermost layer, then in the other layers along the radial direction of the stator core 20 where the fourth conductor group is located, except for the outermost layer, every two adjacent layers in the other layers are provided with the third conductor group.

[0084] Each layer along the radial direction of the stator core 20 where the second conductor group is located is provided with a second conductor group, that is, in each layer along the radial direction of the stator core 20 where the second conductor group is located, every two adjacent layers are provided with a second conductor group, and all radial layers of the stator core 20 in this direction are covered with the second conductor group.

[0085] like Figure 3-11As shown, the conductors in the above-mentioned first conductor group, second conductor group, third conductor group and fourth conductor group are all hairpin coils, and the hairpin coils are all U-shaped conductors. The U-shaped conductor has two welding ends, which are used for welding and connecting with the hairpin coils of the adjacent layer, and has two slots and a plug-in end. One end of the two slots is respectively connected to the two welding ends, and the other end of the two slots is respectively connected to the plug-in end, forming a U-shaped conductor structure. According to the needs of stator winding preparation, U-shaped conductors with similar structures but different pitches are selected to form the structures of the first conductor group, the second conductor group, the third conductor group and the fourth conductor group, so that the stator winding is completely symmetrical in structure on the magnetic circuit. The two welding ends of the U-shaped conductor can extend along the circumference of the stator core 20, and the extension direction is to extend in opposite directions, that is, the extension directions are opposite and close to each other, or the extension directions of the two welding ends are to extend in opposite directions, that is, the extension directions are opposite and away from each other, or the extension directions of the two welding ends are to extend in the same direction, and selection is made according to actual needs.

[0086] Here, the welding ends of the conductors of the first conductor group extend in the same direction along the circumference of the stator core 20, and the welding ends of the conductors of the fourth conductor group extend in the same direction along the circumference of the stator core 20, and the extending direction of the welding ends of the conductors of the first conductor group is opposite to the extending direction of the welding ends of the conductors of the fourth conductor group, one extends to the left and the other extends to the right; the welding ends of the conductors of the second conductor group and the welding ends of the conductors of the third conductor group both extend along the circumference of the stator core 20, and the extending directions are opposite to each other, and the extending directions are opposite and away from each other.

[0087] The radial number of layers of the above-mentioned stator core 20 is an even number greater than or equal to 4, and the radial number of layers of the stator core 20 is greater than or equal to the number of parallel branches*2. When the number of parallel branches is 2, the minimum number of radial layers of the stator core 20 is 4. When the number of parallel branches is 3, the minimum number of radial layers of the stator core 20 is 6, and so on.

[0088] In any winding, along the radial direction of the stator core 20, the welding ends of two conductors of two adjacent layers are welded with a full pitch, and preferably, the full pitch is 9.

[0089] like Figure 18-20As shown, in a multi-phase winding, any parallel branch in each phase winding is star-connected, and the multi-phase winding has the same number of connection points as the number of phases. For example, in a three-phase winding, when each phase winding has three parallel branches, the U1 end of the U phase, the V1 end of the V phase and the W1 end of the W phase are connected together, the U2 end of the U phase, the V2 end of the V phase and the W2 end of the W phase are connected together, and the U3 end of the U phase, the V3 end of the V phase and the W3 end of the W phase are connected together; similarly, in a three-phase winding, when each phase winding has four parallel branches, the U1 end of the U phase, the V1 end of the V phase and the W1 end of the W phase are connected together, the U2 end of the U phase, the V2 end of the V phase and the W2 end of the W phase are connected together, the U3 end of the U phase, the V3 end of the V phase and the W3 end of the W phase are connected together, and the U4 end of the U phase, the V4 end of the V phase and the W4 end of the W phase are connected together.

[0090] like Figure 4 As shown, the above-mentioned first conductor group includes multiple first conductors 150, and the first conductor 150 is a full-pitch conductor. Preferably, the pitch of the first conductor 150 is 9, and the number of the first conductors 150 is 3, that is, the first conductor group includes three first conductors 150 of the same structure, and the three first conductors 150 are arranged in the same radial layer of the stator core 20, and the slots on the same side of the three first conductors 150 are located in three adjacent slots of the layer.

[0091] The second conductor group has various structures: Figure 5 As shown, the second conductor group includes multiple second conductors 350, and the second conductors 350 are full-pitch conductors. Preferably, the pitch of the second conductors 350 is 9, and the number of the second conductors 350 is 3, that is, the second conductor group includes three second conductors 350 with the same structure, and the three second conductors 350 are arranged in two adjacent layers of the stator core 20 with the same radial direction, and the slots on the same side of the three second conductors 350 are located in the three slots of a radial layer of the stator core 20, and the slots on the other side of the three second conductors 350 are located in the three slots of a layer adjacent to the layer.

[0092] Or, if Fig.11As shown, the second conductor group includes a plurality of fifth conductors 300-1A and at least one sixth conductor 300-1B, the fifth conductor 300-1A is a long pitch conductor, and the sixth conductor 300-1B is a short pitch conductor. Preferably, the number of the fifth conductors 300-1A is 2, the number of the sixth conductor 300-1B is 1, the pitch of the fifth conductor 300-1A is 10, the pitch of the sixth conductor 300-1B is 7, and the two fifth conductors 300-1A are arranged around the sixth conductor 300-1B. On the outside, the two fifth conductors 300-1A and the one sixth conductor 300-1B are located in two adjacent layers with the same radial direction of the stator core 20, and the inside of one side slot of the two fifth conductors 300-1A and the inside of one side slot of the sixth conductor 300-1B are located in three slots of a radial layer of the stator core 20, and the inside of the other side slot of the two fifth conductors 300-1A and the inside of the other side slot of the sixth conductor 300-1B are located in three slots of a layer of the stator core 20 adjacent to the layer in the radial direction.

[0093] Or, if Fig.10 As shown, the second conductor group includes at least one seventh conductor 300-2A and a plurality of eighth conductors 300-2B, the seventh conductor 300-2A is a long pitch conductor, and the eighth conductor 300-2B is a short pitch conductor. Preferably, the number of the seventh conductor 300-2A is 1, the number of the eighth conductor 300-2B is 2, the pitch of the seventh conductor 300-2A is 11, the pitch of the eighth conductor 300-2B is 8, and one seventh conductor 300-2A is arranged around two eighth conductors 300- 2B, the two eighth conductors 300-2B and the one seventh conductor 300-2A are located in two adjacent layers with the same radial direction of the stator core 20, and the inside of one side slot of the two eighth conductors 300-2B and the inside of one side slot of the seventh conductor 300-2A are located in three slots of one radial layer of the stator core 20, and the inside of the other side slot of the two eighth conductors 300-2B and the inside of the other side slot of the seventh conductor 300-2A are located in three slots of a layer of the stator core 20 adjacent to the layer in the radial direction.

[0094] The third conductor group has various structures: Figure 6 As shown, the third conductor group includes a plurality of third conductors 250, and the third conductors 250 are full-pitch conductors. Preferably, the number of the third conductors 250 is three, and the pitch of the third conductors 250 is 9, that is, the third conductor group includes three third conductors 250 with the same structure, and the three third conductors 250 are arranged in two adjacent layers of the stator core 20 with the same radial direction, and the slots on the same side of the three third conductors 250 are located in three slots of a radial layer of the stator core 20, and the slots on the other side of the three third conductors 250 are located in three slots of a layer adjacent to the layer.

[0095] Or, if Figure 7As shown, the third conductor group includes a plurality of ninth conductors 200-1A and at least one tenth conductor 200-1B, the ninth conductor 200-1A is a long pitch conductor, and the tenth conductor 200-1B is a short pitch conductor. Preferably, the number of the ninth conductors 200-1A is 2, the number of the tenth conductor 200-1B is 1, the pitch of the ninth conductor 200-1A is 10, the pitch of the tenth conductor 200-1B is 7, and the two ninth conductors 200-1A are arranged around the tenth conductor 200-1 B, the two ninth conductors 200-1A and the tenth conductor 200-1B are located in two adjacent layers with the same radial direction of the stator core 20, and the inside of one side slot of the two ninth conductors 200-1A and the inside of one side slot of the tenth conductor 200-1B are located in three slots of one radial layer of the stator core 20, and the inside of the other side slot of the two ninth conductors 200-1A and the inside of the other side slot of the tenth conductor 200-1B are located in three slots of a layer of the stator core 20 adjacent to the layer in the radial direction.

[0096] Or, if Figure 8 As shown, the third conductor group includes at least one eleventh conductor 200-2A and a plurality of twelfth conductors 200-2B, the eleventh conductor 200-2A is a long pitch conductor, and the twelfth conductor 200-2B is a short pitch conductor. Preferably, the number of the eleventh conductor 200-2A is 1, the number of the twelfth conductor 200-2B is 2, the pitch of the eleventh conductor 200-2A is 11, the pitch of the twelfth conductor 200-2B is 8, and one eleventh conductor 200-2A is arranged around two twelfth conductors 200-2B. 0-2B, the two twelfth conductors 200-2B and the one eleventh conductor 200-2A are located in two adjacent layers with the same radial direction of the stator core 20, and the inside of one side slot of the two twelfth conductors 200-2B and the inside of one side slot of the eleventh conductor 200-2A are located in three slots of one radial layer of the stator core 20, and the inside of the other side slot of the two twelfth conductors 200-2B and the inside of the other side slot of the eleventh conductor 200-2A are located in three slots of a layer of the stator core 20 adjacent to the layer in the radial direction.

[0097] The fourth conductor group has various structures: Figure 3As shown, the fourth conductor group includes a plurality of fourth conductors 100-1A and at least one thirteenth conductor 100-1B, the fourth conductor 100-1A is a long pitch conductor, and the thirteenth conductor 100-1B is a short pitch conductor. Preferably, the number of the fourth conductors 100-1A is 2, the number of the thirteenth conductor 100-1B is 1, the pitch of the fourth conductor 100-1A is 10, the pitch of the thirteenth conductor 100-1B is 7, and the two fourth conductors 100-1A are arranged around one fourth conductor. Outside the thirteenth conductor 100-1B, the two fourth conductors 100-1A and the thirteenth conductor 100-1B are all located in the same radial layer of the stator core 20, and the inside of one side slot of the two fourth conductors 100-1A and the inside of one side slot of the thirteenth conductor 100-1B are located in three slots of this layer of the stator core 20, and the inside of the other side slot of the two fourth conductors 100-1A and the inside of the other side slot of the thirteenth conductor 100-1B are located in the other three slots of this layer of the stator core 20.

[0098] Or, if Fig. 9 As shown, the fourth conductor group includes at least one fourteenth conductor 100-2A and a plurality of fifteenth conductors 100-2B, the fourteenth conductor 100-2A is a long pitch conductor, and the fifteenth conductor 100-2B is a short pitch conductor. Preferably, the number of the fourteenth conductor 100-2A is 1, the number of the fifteenth conductor 100-2B is 2, the pitch of the fourteenth conductor 100-2A is 11, the number of the fifteenth conductor 100-2B is 8, and one fourteenth conductor 100-2A is arranged between two Outside the fifteenth conductor 100-2B, the two fifteenth conductors 100-2B and the fourteenth conductor 100-2A are all located in the same radial layer of the stator core 20, and the inside of one side slot of the two fifteenth conductors 100-2B and the inside of one side slot of the fourteenth conductor 100-2A are located in three slots of this layer of the stator core 20, and the inside of the other side slot of the two fifteenth conductors 100-2B and the inside of the other side slot of the fourteenth conductor 100-2A are located in the other three slots of this layer of the stator core 20.

[0099] A motor stator comprises a stator core 20 and the above-mentioned motor stator winding, wherein the motor stator winding is arranged on the stator core 20.

[0100] A motor comprises the motor stator mentioned above.

[0101] The following describes in detail some specific embodiments.

[0102] Embodiment 1

[0103] In this embodiment, the stator winding is mounted on the stator core 20, and the stator core 20 has a plurality of slots 21, and the plurality of slots 21 are formed on the radial inner surface of the stator core 20 and are spaced apart at a predetermined slot pitch along the circumferential direction of the stator core 20; the stator winding is three-phase, and a plurality of hairpin coils in each phase winding are arranged along the circumference of the stator core 20, and the welding ends of the hairpin coils in adjacent layers are welded and connected to form two parallel branches, and each branch winding in the three-phase stator winding is connected in parallel in sequence along the circumference of the stator core 20. The number of slots per pole per phase is greater than or equal to 2, and in this embodiment, the number of slots per pole per phase is 3, the rotor has 6 magnetic poles and this is true for each phase of the stator winding, and the number of slots in the stator core 20 is 54.

[0104] The stator core 20 has a tooth portion defined by two adjacent slots. The stator core 20 is formed by stacking a plurality of annular magnetic steel plates to form two end faces in the axial direction of the stator core 20. Other conventional metal plates may also be used instead of the magnetic steel plates.

[0105] In this embodiment, if Figures 12a-13b As shown, the number of radial layers of the stator core 20 is 4. Each phase winding of the stator winding has two coil groups, and the two coil groups are arranged in sequence along the circumference of the stator core 20. Each coil group includes a first conductor group, a fourth conductor group, two third conductor groups and two second conductor groups, that is, each phase winding of the stator winding includes two first conductor groups, two fourth conductor groups, four second conductor groups and four third conductor groups. The first conductor group is arranged on the fourth layer of the stator core 20, and the fourth conductor group is arranged on the first layer of the stator core 20. The third conductor group is arranged in the two adjacent layers in the radial direction of the stator core 20 where the first conductor group is located, that is, the third conductor group is arranged in the second and third layers of the stator core 20; the third conductor group is arranged in the two adjacent layers in the radial direction of the stator core 20 where the fourth conductor group is located, that is, the third conductor group is arranged in the second and third layers of the stator core 20; the second conductor group is arranged adjacent to the first conductor group along the circumference of the stator core 20, and the second conductor group is arranged in the first, second, third and fourth layers.

[0106] Specifically, if Fig.12a , 12b As shown in FIG. 4 , the first conductor group includes three first conductors 150, and the first conductors 150 are full-pitch conductors. Preferably, the pitch of the first conductors 150 is 9. The three first conductors 150 are all arranged in the fourth layer of the stator core 20. The two slots of the first first conductor 150 are located at slots 10 and 19 of the fourth layer of the stator core 20, the two slots of the second first conductor 150 are located at slots 11 and 20 of the fourth layer of the stator core 20, and the two slots of the third first conductor 150 are located at slots 12 and 21 of the fourth layer of the stator core 20.

[0107] like Fig.12a , 12b As shown in Figure 5, the second conductor group includes three second conductors 350, and the second conductors 350 are full-pitch conductors. Preferably, the pitch of the second conductors 350 is 9. The three second conductors 350 are all arranged in the first layer, the second layer or the third layer, and the fourth layer of the stator core 20. The two slots of the first second conductor 350 are located at the 19 slots of the first layer and the third layer, and the 28 slots of the second layer and the fourth layer of the stator core 20. The two slots of the second second conductor 350 are located at the 20 slots of the first layer and the third layer, and the 29 slots of the second layer and the fourth layer of the stator core 20. The two slots of the third second conductor 350 are located at the 21 slots of the first layer and the third layer, and the 30 slots of the second layer and the fourth layer of the stator core 20.

[0108] like Fig.12a , 12b As shown in , 6, the third conductor group includes three third conductors 250, and the third conductors 250 are full-pitch conductors. Preferably, the pitch of the third conductors 250 is 9, and the three third conductors 250 are all arranged in the second layer and the third layer of the stator core 20. The two slots of the first third conductor 250 are located at the 1st slot of the third layer and the 10th slot of the second layer of the stator core 20, the two slots of the second third conductor 250 are located at the 2nd slot of the third layer and the 11th slot of the second layer of the stator core 20, the two slots of the third third conductor 250 are located at the 3rd slot of the third layer and the 12th slot of the second layer of the stator core 20, and the two slots of the first third conductor 250 are located at the 10th slot of the third layer and the 19th slot of the second layer, the two slots of the second third conductor 250 are located at the 11th slot of the third layer and the 20th slot of the second layer, and the two slots of the third third conductor 250 are located at the 12th slot of the third layer and the 21st slot of the second layer of the stator core 20.

[0109] like Fig.12a , 12b As shown in , 3, the fourth conductor group includes two fourth conductors 100-1A and one thirteenth conductor 100-1B, the fourth conductor 100-1A is a long pitch conductor, preferably, the pitch of the fourth conductor 100-1A is 10, the thirteenth conductor 100-1B is a short pitch conductor, preferably, the pitch of the thirteenth conductor 100-1B is 7, the two fourth conductors 100-1A and the one thirteenth conductor 100-1B are both arranged in the first layer of the stator core 20, the two slots of the first fourth conductor 100-1A are located at the 1st slot and the 11th slot of the first layer of the stator core 20, the two slots of the second fourth conductor 100-1A are located at the 2nd slot and the 12th slot of the first layer of the stator core 20, and the two slots of the thirteenth conductor 100-1B are located at the 3rd slot and the 10th slot of the first layer of the stator core 20.

[0110] like Figure 13a-13b As shown, at the welding end of the stator winding, the two welding ends of the two hairpin coils of adjacent layers are welded at a full pitch, preferably, the full pitch is 9. In this embodiment, each phase winding has two parallel branches, with a lead segment U1, an outlet terminal U3, a lead segment U2 and an outlet terminal U4.

[0111] Embodiment 2

[0112] In this embodiment, the stator winding is mounted on the stator core 20, and the stator core 20 has a plurality of slots 21, and the plurality of slots 21 are formed on the radial inner surface of the stator core 20 and are spaced apart at a predetermined slot pitch along the circumferential direction of the stator core 20; the stator winding is three-phase, and a plurality of hairpin coils in each phase winding are arranged along the circumference of the stator core 20, and the welding ends of the hairpin coils in adjacent layers are welded and connected to form four parallel branches, and each branch winding in the three-phase stator winding is connected in parallel in sequence along the circumference of the stator core 20. The number of slots per pole per phase is greater than or equal to 2, and in this embodiment, the number of slots per pole per phase is 3, the rotor has 12 magnetic poles and this is true for each phase of the stator winding, and the number of slots in the stator core 20 is 108.

[0113] The stator core 20 has a tooth portion defined by two adjacent slots. The stator core 20 is formed by stacking a plurality of annular magnetic steel plates to form two end faces in the axial direction of the stator core 20. Other conventional metal plates may also be used instead of the magnetic steel plates.

[0114] like Figures 14a-15d As shown, in this embodiment, the number of radial layers of the stator core 20 is 8. Each phase winding of the stator winding has four coil groups, and the four coil groups are arranged in sequence along the circumference of the stator core 20. Each coil group includes a first conductor group, a fourth conductor group, six third conductor groups and four second conductor groups. That is, each phase winding of the stator winding includes 4 first conductor groups, 4 fourth conductor groups, 16 second conductor groups and 24 third conductor groups. The first conductor group is arranged on the eighth layer of the stator core 20, and the fourth conductor group is arranged on the first layer of the stator core 20. The adjacent two layers in the radial direction of the stator core 20 where the first conductor group is located are arranged. A third conductor group is provided, that is, the third conductor group is provided in the second and third layers, the fourth and fifth layers, the sixth and seventh layers of the stator core 20; the third conductor group is provided in the two adjacent layers in the radial direction of the stator core 20 where the fourth conductor group is located, that is, the third conductor group is provided in the second and third layers, the fourth and fifth layers, the sixth and seventh layers of the stator core 20; the second conductor group is adjacent to the first conductor group along the circumferential direction of the stator core 20, and the second conductor group is provided in the first, second, third, fourth, fifth, sixth, seventh and eighth layers.

[0115] Specifically, if Figures 14a-14d As shown in Figure 4, the first conductor group includes three first conductors 150, and the first conductors 150 are full-pitch conductors. Preferably, the pitch of the first conductors 150 is 9. The three first conductors 150 are all arranged in the eighth layer of the stator core 20. The two slots of the first first conductor 150 are located at slots 10 and 19 of the eighth layer of the stator core 20, the two slots of the second first conductor 150 are located at slots 11 and 20 of the eighth layer of the stator core 20, and the two slots of the third first conductor 150 are located at slots 12 and 21 of the eighth layer of the stator core 20.

[0116] like Figures 14a-14d As shown in Figure 5, the second conductor group includes three second conductors 350, and the second conductors 350 are full-pitch conductors. Preferably, the pitch of the second conductors 350 is 9. The three second conductors 350 are all arranged in the first, second, third, fourth, fifth, sixth, seventh and eighth layers of the stator core 20. The two slots of the first second conductor 350 are located at 19 slots in the first, third, fifth and seventh layers and 28 slots in the second, fourth, sixth and eighth layers of the stator core 20. The two slots of the second second conductor 350 are located at 20 slots in the first, third, fifth and seventh layers and 29 slots in the second, fourth, sixth and eighth layers of the stator core 20. The two slots of the third second conductor 350 are located at 21 slots in the first, third, fifth and seventh layers and 30 slots in the second, fourth, sixth and eighth layers of the stator core 20.

[0117] like Figures 14a-14dAs shown in FIG. 7 , the third conductor group includes two ninth conductors 200-1A and one tenth conductor 200-1B, the ninth conductor 200-1A is a long pitch conductor, preferably, the pitch of the ninth conductor 200-1A is 10, the tenth conductor 200-1B is a short pitch conductor, preferably, the pitch of the tenth conductor 200-1B is 7, the two ninth conductors 200-1A and the one tenth conductor 200-1B are arranged in the second, third, fourth, fifth, sixth and seventh layers of the stator core 20, the two slots of the first ninth conductor 200-1A are located in the 1 slot of the third, fifth and seventh layers of the stator core 20 and the 11 slots of the second, fourth and sixth layers, the two slots of the second ninth conductor 200-1A are located in the third, 2 slots of the fifth and seventh layers and 12 slots of the second, fourth and sixth layers, two slots of the tenth conductor 200-1B are located inside the 3 slots of the third, fifth and seventh layers and 10 slots of the second, fourth and sixth layers of the stator core 20, and, two slots of the first ninth conductor 200-1A are located inside the 10 slots of the third, fifth and seventh layers and the 20 slots of the second, fourth and sixth layers of the stator core 20, two slots of the second ninth conductor 200-1A are located inside the 11 slots of the third, fifth and seventh layers and the 21 slots of the second, fourth and sixth layers of the stator core 20, and two slots of the tenth conductor 200-1B are located inside the 12 slots of the third, fifth and seventh layers and the 19 slots of the second, fourth and sixth layers of the stator core 20.

[0118] like Figures 14a-14d As shown in , 3, the fourth conductor group includes two fourth conductors 100-1A and one thirteenth conductor 100-1B, the fourth conductor 100-1A is a long pitch conductor, preferably, the pitch of the fourth conductor 100-1A is 10, the thirteenth conductor 100-1B is a short pitch conductor, preferably, the pitch of the thirteenth conductor 100-1B is 7, the two fourth conductors 100-1A and the one thirteenth conductor 100-1B are both arranged in the first layer of the stator core 20, the two slots of the first fourth conductor 100-1A are located at the 1st slot and the 11th slot of the first layer of the stator core 20, the two slots of the second fourth conductor 100-1A are located at the 2nd slot and the 12th slot of the first layer of the stator core 20, and the two slots of the thirteenth conductor 100-1B are located at the 3rd slot and the 10th slot of the first layer of the stator core 20.

[0119] like Figures 15a-15d As shown, at the welding end of the stator winding, the two welding ends of the two hairpin coils in adjacent layers are welded at a full pitch, and preferably, the full pitch is 9. In this embodiment, each phase winding has four parallel branches, including a lead segment U1, an outlet terminal U2, a lead segment U3, an outlet terminal U4, a lead segment U5, an outlet terminal U6, a lead segment U7, and an outlet terminal U8.

[0120] Embodiment 3

[0121] Compared with the second embodiment, the structure of the third conductor group in this embodiment is different, and the other structures are the same. In this embodiment, the structure of the third conductor group is described, and the other structures are not repeated.

[0122] In this embodiment, if Figure 8 As shown, the third conductor group includes one eleventh conductor 200-2A and two twelfth conductors 200-2B, the eleventh conductor 200-2A is a long pitch conductor, preferably, the pitch of the eleventh conductor 200-2A is 11, the twelfth conductor 200-2B is a short pitch conductor, preferably, the pitch of the twelfth conductor 200-2B is 8, the eleventh conductor 200-2A and the two twelfth conductors 200-2B are arranged in the second layer, the third layer, the fourth layer, the fifth layer, the sixth layer and the seventh layer of the stator core 20, the two slots of the eleventh conductor 200-2A are located in the 1 slot of the third layer, the fifth layer and the seventh layer of the stator core 20, and the two slots of the first twelfth conductor 200-2B are located in the third layer, the fifth layer and the seventh layer of the stator core 20. The 2 slots of the fifth and seventh layers and the 10 slots of the second, fourth and sixth layers, the two slots of the second twelfth conductor 200-2B are located inside the 3 slots of the third, fifth and seventh layers of the stator core 20 and the 11 slots of the second, fourth and sixth layers, and the two slots of the eleventh conductor 200-2A are located inside the 10 slots of the third, fifth and seventh layers of the stator core 20 and the 21 slots of the second, fourth and sixth layers, the two slots of the first twelfth conductor 200-2B are located inside the 11 slots of the third, fifth and seventh layers of the stator core 20 and the 19 slots of the second, fourth and sixth layers, and the two slots of the second twelfth conductor 200-2B are located inside the 12 slots of the third, fifth and seventh layers of the stator core 20 and the 20 slots of the second, fourth and sixth layers.

[0123] Embodiment 4

[0124] In this embodiment, the stator winding is mounted on the stator core 20, and the stator core 20 has a plurality of slots 21, and the plurality of slots 21 are formed on the radial inner surface of the stator core 20 and are spaced apart at a predetermined slot pitch along the circumferential direction of the stator core 20; the stator winding is three-phase, and a plurality of hairpin coils in each phase winding are arranged along the circumference of the stator core 20, and the welding ends of the hairpin coils in adjacent layers are welded and connected to form three parallel branches, and each branch winding in the three-phase stator winding is connected in parallel in sequence along the circumference of the stator core 20. The number of slots per pole per phase is greater than or equal to 2, and in this embodiment, the number of slots per pole per phase is 3, the rotor has 12 magnetic poles and this is true for each phase of the stator winding, and the number of slots in the stator core 20 is 108.

[0125] The stator core 20 has a tooth portion defined by two adjacent slots. The stator core 20 is formed by stacking a plurality of annular magnetic steel plates to form two end faces in the axial direction of the stator core 20. Other conventional metal plates may also be used instead of the magnetic steel plates.

[0126] In this embodiment, if Figures 16a-17c As shown, the number of radial layers of the stator core 20 is 8. Each phase winding of the stator winding has three coil groups, which are arranged in sequence along the circumference of the stator core 20. Each coil group includes a first conductor group, a fourth conductor group, six third conductor groups and eight second conductor groups. That is, each phase winding of the stator winding includes 3 first conductor groups, 3 fourth conductor groups, 24 second conductor groups and 18 third conductor groups. The first conductor group is arranged on the eighth layer of the stator core 20, the fourth conductor group is arranged on the first layer of the stator core 20, and the adjacent two layers in the radial direction of the stator core 20 where the first conductor group is located are arranged. A third conductor group is provided, that is, the third conductor group is provided in the second and third layers, the fourth and fifth layers, the sixth and seventh layers of the stator core 20; the third conductor group is provided in the two adjacent layers in the radial direction of the stator core 20 where the fourth conductor group is located, that is, the third conductor group is provided in the second and third layers, the fourth and fifth layers, the sixth and seventh layers of the stator core 20; the second conductor group is adjacent to the first conductor group along the circumferential direction of the stator core 20, and the second conductor group is provided in the first, second, third, fourth, fifth, sixth, seventh and eighth layers.

[0127] Specifically, Figure 16a-16c As shown in Figure 4, the first conductor group includes three first conductors 150, and the first conductors 150 are full-pitch conductors. Preferably, the pitch of the first conductors 150 is 9. The three first conductors 150 are all arranged in the eighth layer of the stator core 20. The two slots of the first first conductor 150 are located at slots 10 and 19 of the eighth layer of the stator core 20, the two slots of the second first conductor 150 are located at slots 11 and 20 of the eighth layer of the stator core 20, and the two slots of the third first conductor 150 are located at slots 12 and 21 of the eighth layer of the stator core 20.

[0128] like Figure 16a-16cAs shown in Figure 11, the second conductor group includes two fifth conductors 300-1A and one sixth conductor 300-1B, the fifth conductor 300-1A is a long pitch conductor, preferably, the pitch of the fifth conductor 300-1A is 10, the sixth conductor 300-1B is a short pitch conductor, preferably, the pitch of the sixth conductor 300-1B is 7, the two fifth conductors 300-1A and the one sixth conductor 300-1B are arranged in the first layer, the second layer, the third layer, the fourth layer, the fifth layer, the sixth layer, the seventh layer and the eighth layer of the stator core 20, the two slots of the first fifth conductor 300-1A are located at 19 slots in the first layer, the third layer, the fifth layer and the seventh layer, and 29 slots in the second layer, the fourth layer, the sixth layer and the eighth layer of the stator core 20, and the two slots of the second fifth conductor 300-1A are located at 2 slots in the first layer, the third layer, the fifth layer and the seventh layer of the stator core 20. 0 slots, 30 slots in the second, fourth, sixth and eighth layers, the two slots of the sixth conductor 300-1B are located at 21 slots in the first, third, fifth and seventh layers, and 28 slots in the second, fourth, sixth and eighth layers of the stator core 20; and the two slots of the first fifth conductor 300-1A are located at 28 slots in the first, third, fifth and seventh layers, and 38 slots in the second, fourth, sixth and eighth layers of the stator core 20, the two slots of the second fifth conductor 300-1A are located at 29 slots in the first, third, fifth and seventh layers, and 39 slots in the second, fourth, sixth and eighth layers of the stator core 20, and the two slots of the sixth conductor 300-1B are located at 30 slots in the first, third, fifth and seventh layers, and 37 slots in the second, fourth, sixth and eighth layers of the stator core 20. In this embodiment, the second conductor group has two groups, which are located in two adjacent radial directions of the stator core 20.

[0129] like Figure 16a-16cAs shown in FIG. 7 , the third conductor group includes two ninth conductors 200-1A and one tenth conductor 200-1B, the ninth conductor 200-1A is a long pitch conductor, preferably, the pitch of the ninth conductor 200-1A is 10, the tenth conductor 200-1B is a short pitch conductor, preferably, the pitch of the tenth conductor 200-1B is 7, the two ninth conductors 200-1A and the one tenth conductor 200-1B are arranged in the second, third, fourth, fifth, sixth and seventh layers of the stator core 20, the two slots of the first ninth conductor 200-1A are located in the 1 slot of the third, fifth and seventh layers of the stator core 20 and the 11 slots of the second, fourth and sixth layers, the two slots of the second ninth conductor 200-1A are located in the third, 2 slots of the fifth and seventh layers and 12 slots of the second, fourth and sixth layers, two slots of the tenth conductor 200-1B are located inside the 3 slots of the third, fifth and seventh layers and 10 slots of the second, fourth and sixth layers of the stator core 20, and, two slots of the first ninth conductor 200-1A are located inside the 10 slots of the third, fifth and seventh layers and the 20 slots of the second, fourth and sixth layers of the stator core 20, two slots of the second ninth conductor 200-1A are located inside the 11 slots of the third, fifth and seventh layers and the 21 slots of the second, fourth and sixth layers of the stator core 20, and two slots of the tenth conductor 200-1B are located inside the 12 slots of the third, fifth and seventh layers and the 19 slots of the second, fourth and sixth layers of the stator core 20.

[0130] like Figure 16a-16c As shown in Figure 9, the fourth conductor group includes one fourteenth conductor 100-2A and two fifteenth conductors 100-2B, the fourteenth conductor 100-2A is a long pitch conductor, preferably, the pitch of the fourth conductor 100-1A is 11, the fifteenth conductor 100-2B is a short pitch conductor, preferably, the pitch of the thirteenth conductor 100-1B is 8, one fourteenth conductor 100-2A and two fifteenth conductors 100-2B are both arranged in the first layer of the stator core 20, the two slots of the fourteenth conductor 100-2A are located at the 1st slot and the 12th slot of the first layer of the stator core 20, the two slots of the first fifteenth conductor 100-2B are located at the 2nd slot and the 10th slot of the first layer of the stator core 20, and the two slots of the second fifteenth conductor 100-2B are located at the 3rd slot and the 11th slot of the first layer of the stator core 20.

[0131] like Figures 17a-17c As shown, at the welding end of the stator winding, the two welding ends of the two hairpin coils of the adjacent layers are welded at a full pitch, preferably, the full pitch is 9. In this embodiment, each phase winding has four parallel branches, including a lead segment U1, an outlet terminal U2, a lead segment U3, an outlet terminal U4, a lead segment U5 and an outlet terminal U6.

[0132] Embodiment 5

[0133] Compared with the fourth embodiment, the structure of the second conductor group is different, and the other structures are the same. In this embodiment, the structure of the second conductor group is described, and other structures are not repeated.

[0134] like Fig.10 As shown, the second conductor group includes one seventh conductor 300-2A and two eighth conductors 300-2B, the seventh conductor 300-2A is a long pitch conductor, preferably, the pitch of the seventh conductor 300-2A is 11, the eighth conductor 300-2B is a short pitch conductor, preferably, the pitch of the eighth conductor 300-2B is 8, one seventh conductor 300-2A and two eighth conductors 300-2B are arranged in the first layer, the second layer, the third layer, the fourth layer, the fifth layer, the sixth layer, the seventh layer and the eighth layer of the stator core 20, the two slots of the seventh conductor 300-2A are located in 19 slots of the first layer, the third layer, the fifth layer and the seventh layer, and 30 slots of the second layer, the fourth layer, the sixth layer and the eighth layer of the stator core 20, the two slots of the first eighth conductor 300-2B are located in 20 slots of the first layer, the third layer, the fifth layer and the seventh layer, and the eighth layer. The second, fourth, sixth and eighth layers have 28 slots, and the two slots of the second eighth conductor 300-2B are located inside the 21 slots of the first, third, fifth and seventh layers, and the 29 slots of the second, fourth, sixth and eighth layers of the stator core 20; and, the two slots of the seventh conductor 300-2A are located inside the 28 slots of the first, third, fifth and seventh layers, and the 39 slots of the second, fourth, sixth and eighth layers of the stator core 20, the two slots of the first eighth conductor 300-2B are located inside the 29 slots of the first, third, fifth and seventh layers, and the 37 slots of the second, fourth, sixth and eighth layers of the stator core 20, and the two slots of the second eighth conductor 300-2B are located inside the 30 slots of the first, third, fifth and seventh layers, and the 38 slots of the second, fourth, sixth and eighth layers of the stator core 20.

[0135] Due to the adoption of the above technical solution, the stator winding has multiple coil groups, the number of coil groups in each phase winding is consistent with the number of parallel branches in the phase winding, and the radial number of layers of the stator core is selected according to the parallel branches, so that the structure of the stator winding adopts a completely symmetrical structure in the magnetic circuit, eliminating the loop current problem caused by the asymmetric structure, the hairpin coils constituting the stator winding are all U-shaped conductors, and the types of the hairpin coils in the stator winding are the same, which simplifies the manufacturing process, reduces the production cost, and improves the processing efficiency.

[0136] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A motor stator winding, comprising a multi-phase winding, characterized in that: Any phase winding includes a plurality of coil groups connected in sequence, and the plurality of coil groups are arranged in sequence along the circumference of the stator core; Any of the coil groups includes a first conductor group, a second conductor group, a third conductor group and a fourth conductor group, wherein the first conductor group and the fourth conductor group are both arranged in the same layer along the radial direction of the stator core, and the second conductor group and the third conductor group are both arranged in two adjacent layers along the radial direction of the stator core; Along the circumferential direction of the stator core, the fourth conductor group, the first conductor group and the second conductor group are arranged adjacent to each other; The first conductor group is arranged at the radial innermost layer or the radial outermost layer of the stator core, the fourth conductor group is arranged at the radial innermost layer or the radial outermost layer of the stator core, and the first conductor group and the fourth conductor group are arranged at different radial layers of the stator core; Along the radial direction of the stator core, except for the innermost layer and the outermost layer, each layer of the stator core where the first conductor group and the fourth conductor group are located is provided with a third conductor group; Each layer along the radial direction of the stator core where the second conductor group is located is provided with the second conductor group.

2. The motor stator winding according to claim 1, characterized in that: In any winding, the number of coil groups is the same as the number of parallel branches; Any phase winding includes N branches, and the N branches are sequentially connected in parallel along the circumference of the stator core, wherein N is greater than or equal to 2.

3. The motor stator winding according to claim 1 or 2, characterized in that: The first conductor group includes a plurality of first conductors, the first conductors are full-pitch conductors, the pitch of the first conductors is 9, and the number of the first conductors is 3.

4. The motor stator winding according to claim 1 or 2, characterized in that: The second conductor group includes a plurality of second conductors, the second conductors are full-pitch conductors, the pitch of the second conductors is 9, and the number of the second conductors is 3.

5. The motor stator winding according to claim 1 or 2, characterized in that: The second conductor group includes multiple fifth conductors and at least one sixth conductor, the fifth conductor is a long-pitch conductor, the sixth conductor is a short-pitch conductor, the number of the fifth conductors is 2, the number of the sixth conductor is 1, the pitch of the fifth conductor is 10, and the pitch of the sixth conductor is 7.

6. The motor stator winding according to claim 1 or 2, characterized in that: The second conductor group includes at least one seventh conductor and multiple eighth conductors, the seventh conductor is a long-pitch conductor, the eighth conductor is a short-pitch conductor, the number of the seventh conductor is 1, the number of the eighth conductors is 2, the pitch of the seventh conductor is 11, and the pitch of the eighth conductor is 8.

7. The motor stator winding according to claim 1 or 2, characterized in that: The third conductor group includes a plurality of third conductors, the third conductors are full-pitch conductors, the number of the third conductors is three, and the pitch of the third conductors is 9.

8. The motor stator winding according to claim 1 or 2, characterized in that: The third conductor group includes multiple ninth conductors and at least one tenth conductor, the ninth conductor is a long-pitch conductor, the tenth conductor is a short-pitch conductor, the number of the ninth conductors is 2, the number of the tenth conductor is 1, the pitch of the ninth conductor is 10, and the pitch of the tenth conductor is 7.

9. The motor stator winding according to claim 1 or 2, characterized in that: The third conductor group includes at least one eleventh conductor and multiple twelfth conductors, the eleventh conductor is a long-pitch conductor, the twelfth conductor is a short-pitch conductor, the number of the eleventh conductor is 1, the number of the twelfth conductor is 2, the pitch of the eleventh conductor is 11, and the pitch of the twelfth conductor is 8.

10. The motor stator winding according to claim 1 or 2, characterized in that: The fourth conductor group includes multiple fourth conductors and at least one thirteenth conductor, the fourth conductors are long-pitch conductors, the thirteenth conductor is a short-pitch conductor, the number of the fourth conductors is 2, the number of the thirteenth conductor is 1, the pitch of the fourth conductors is 10, and the pitch of the thirteenth conductor is 7.

11. The motor stator winding according to claim 1 or 2, characterized in that: The fourth conductor group includes at least one fourteenth conductor and multiple fifteenth conductors, the fourteenth conductor is a long-pitch conductor, the fifteenth conductor is a short-pitch conductor, the number of the fourteenth conductor is 1, the number of the fifteenth conductor is 2, the pitch of the fourteenth conductor is 11, and the number of the fifteenth conductor is 8.

12. The motor stator winding according to claim 1 or 2, characterized in that: The welding ends of the conductors of the first conductor group extend in the same direction along the circumferential direction of the stator core, the welding ends of the conductors of the fourth conductor group extend in the same direction along the circumferential direction of the stator core, and the extending direction of the welding ends of the conductors of the first conductor group is opposite to the extending direction of the welding ends of the conductors of the fourth conductor group; The welding ends of the conductors of the second conductor group and the welding ends of the conductors of the third conductor group both extend along the circumferential direction of the stator core, and the extending directions are both opposite to each other.

13. The motor stator winding according to claim 1 or 2, characterized in that: The radial number of layers of the stator core is an even number greater than or equal to 4, and the radial number of layers of the stator core is greater than or equal to the number of parallel branches*2.

14. The motor stator winding according to claim 1, characterized in that: The two welding ends of two adjacent layers of conductors in any phase winding are welded at an entire pitch, and the entire pitch is 9.

15. A motor stator, characterized in that: It comprises a stator core and a motor stator winding as claimed in any one of claims 1 to 14, wherein the motor stator winding is arranged on the stator core.

16. A motor, characterized in that: Comprising the motor stator as claimed in claim 15.

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