A motor winding and stator assembly

Abstract

The application provides a motor winding, comprising: a multi-phase winding, each phase winding comprising a plurality of branches, each branch comprising: a forward coil group comprising a plurality of U-shaped coils, the span of the U-shaped coils of the forward coil group being y, y-2 or y+1, y representing a pole pitch of the motor; a reverse coil group comprising a plurality of U-shaped coils, the span of the U-shaped coils of the reverse coil group being y, y-1 or y+2; and a same-layer jumper with a span of y-2 or y+1, the same-layer jumper connecting the forward coil group and the reverse coil group; wherein the U-shaped coils of the forward coil group are connected in a circumferential direction for one turn and then connected in a radial direction to the next turn; the reverse coil group has the same winding mode as the forward coil group and has an opposite winding direction. The application improves the slot fill rate of the stator winding stator slot, reduces the resistance of the stator winding, reduces the copper loss of the motor, and improves the efficiency of the motor.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric machines, in particular to an electric machine winding and stator assembly. BACKGROUND

[0002] The existing flat wire motor usually adopts short-pitch winding to weaken the winding magnetic potential harmonic, which adopts full-pitch winding, and due to the staggered use of the staggered winding scheme, it is equivalent to a set of double-layer short-pitch winding, so that the flat wire coils in one stator slot belong to different phase windings. In order to ensure the reliability of insulation, it is necessary to increase the interlayer insulation paper, thereby reducing the slot fill factor of the stator slot in the stator winding, and reducing the efficiency of the motor. SUMMARY

[0003] The present application provides an electric machine winding and stator assembly, which solves the problem that the flat wire coils in one stator slot belong to different phase windings, and the slot fill factor of the stator slot is low, and the following technical scheme can be provided.

[0004] The present application provides an electric machine winding, comprising:

[0005] A multi-phase winding, each phase of the winding comprising a plurality of branches, each branch comprising:

[0006] A forward coil group comprising a plurality of U-shaped coils, the span of the U-shaped coils of the forward coil group being y, y-2, y+1, y representing the pole pitch of the motor;

[0007] A reverse coil group comprising a plurality of U-shaped coils, the span of the U-shaped coils of the reverse coil group being y, y-1, y+2; and

[0008] A same-layer jumper with a span of y-2 or y+1, the same-layer jumper connecting the forward coil group and the reverse coil group;

[0009] Wherein, the U-shaped coils of the forward coil group are connected circumferentially for one turn and then connected radially to the next turn; the reverse coil group has the same winding mode as the forward coil group, and the winding direction is opposite.

[0010] In an embodiment of the present application, in the first branch of each phase winding, in the forward coil group, the U-shaped coil with a span of y is circumferentially connected for one turn, and then connected radially to the next turn through a U-shaped coil with a span of y+1.

[0011] In an embodiment of the present application, in the first branch of each phase winding, in the reverse coil group, the U-shaped coil with a span of y is circumferentially connected for one turn, and then connected radially to the next turn through a U-shaped coil with a span of y-1.

[0012] In an embodiment of the present application, in the remaining branches of each phase winding, in the forward coil group, after the U-shaped coil with a span of y is connected to the first turn in the circumferential direction, the U-shaped coil with a span of y+1 is connected to the second turn in the radial direction; after the U-shaped coil with a span of y is connected to the second turn in the circumferential direction, the U-shaped coil with a span of y-2 is connected to the next turn in the radial direction.

[0013] In an embodiment of the present application, in the remaining branches of each phase winding, in the reverse coil group, after the U-shaped coil with a span of y is connected to the first turn in the circumferential direction, the U-shaped coil with a span of y-1 is connected to the second turn in the radial direction; after the U-shaped coil with a span of y is connected to the second turn in the circumferential direction, the U-shaped coil with a span of y+2 is connected to the next turn in the radial direction.

[0014] In an embodiment of the present application, each branch further comprises:

[0015] The lead-out coils, the number of which is at least two, one of the lead-out coils serving as a lead-in end and the other serving as a lead-out end.

[0016] In an embodiment of the present application, each forward coil group or each reverse coil group under one magnetic pole is radially adjacent to the U-shaped coils with a difference of two slot layers in the radial direction.

[0017] The present application further provides a stator assembly, comprising:

[0018] The core is provided with a plurality of stator slots, which are distributed in the circumferential direction of the core;

[0019] The multi-phase winding is wound on the core, each phase of the winding comprising a plurality of branches, each branch comprising:

[0020] a forward coil group comprising a plurality of U-shaped coils, the U-shaped coils of the forward coil group having spans of y, y-2 and y+1, y representing the pole pitch of the motor;

[0021] a reverse coil group comprising a plurality of U-shaped coils, the U-shaped coils of the reverse coil group having spans of y, y-1 and y+2; and

[0022] a same-layer jumper with a span of y-2 or y+1, the same-layer jumper connecting the forward coil group and the reverse coil group;

[0023] The U-shaped coils of the forward coil group are connected to the next turn in the radial direction after being connected to a turn in the circumferential direction; the reverse coil group has the same winding mode as the forward coil group but has an opposite winding direction.

[0024] In an embodiment of the present application, the stator slot of the iron core is provided with M slot layers, and M is an even number.

[0025] In an embodiment of the present application, the same-layer jumper wire is located in the Mth slot layer.

[0026] The present application provides a motor winding and a stator assembly, which improves the slot fill factor of the stator winding, reduces the resistance of the stator winding, reduces the copper loss of the motor, and improves the efficiency of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 FIG. 1 is a structural schematic diagram of a stator assembly according to the present application.

[0028] Figure 2 FIG. 2 is a wiring schematic diagram of a phase winding in an embodiment of the stator assembly according to the present application.

[0029] Figure 3 FIG. 3 is a structural schematic diagram of a full-pitch U-shaped coil in the stator assembly according to the present application.

[0030] Figure 4 FIG. 4 is a structural schematic diagram of a first long-pitch U-shaped coil in the stator assembly according to the present application.

[0031] Figure 5 FIG. 5 is a structural schematic diagram of a first short-pitch U-shaped coil in the stator assembly according to the present application.

[0032] Figure 6 FIG. 6 is a structural schematic diagram of a second long-pitch U-shaped coil in the stator assembly according to the present application.

[0033] Figure 7 FIG. 7 is a structural schematic diagram of a second short-pitch U-shaped coil in the stator assembly according to the present application.

[0034] Figure 8 FIG. 8 is a structural schematic diagram of a same-layer jumper wire in the stator assembly according to the present application.

[0035] Figure 9 FIG. 9 is a structural schematic diagram of a lead conductor in the stator assembly according to the present application.

[0036] Figure 10 FIG. 10 is a structural schematic diagram of coil distribution in a lower slot of a magnetic pole in the stator assembly according to the present application.

[0037] Figure 11 FIG. 11 is a structural schematic diagram of a star connection of one parallel branch in the stator assembly according to the present application.

[0038] Figure 12 FIG. 12 is a structural schematic diagram of a star connection of two parallel branches in the stator assembly according to the present application.

[0039] In the figure: 100, stator winding; 1001, hairpin end; 1002, soldering end;

[0040] 110, full-pitch U-shaped coil;

[0041] 120, first long-pitch U-shaped coil;

[0042] 130, first short-pitch U-shaped coil;

[0043] 140, second long-pitch U-shaped coil;

[0044] 150, second short-pitch U-shaped coil;

[0045] 160, same-layer jumper wire;

[0046] 170, lead coil;

[0047] 101, connecting section; 102, straight section; 103, twisted head section;

[0048] 200, stator core; 210, stator slot. DETAILED DESCRIPTION

[0049] The present application is described herein with reference to specific embodiments thereof which are illustrated in the attached drawings. These embodiments are described in detail so as to enable those skilled in the art to practice the application, and will provide the fullest disclosure of the application. The application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art. In the drawings, like reference numerals refer to like elements throughout.

[0050] It is to be understood that the above-mentioned arrangements are merely intended to illustrate the basic principles of the application, and therefore, only some of the components related to the application are shown in the drawings, rather than the actual number, shape and size of the components when implemented. The actual implementation of the components may vary, and the layout of the components may be more complex.

[0051] Please refer to Figure 1As shown, in some embodiments, the present application proposes a stator assembly, which can include a stator winding 100 and a stator core 200. The stator winding 100 can include a plurality of phase windings, which are different from each other in electrical phase, for example, the stator winding 100 can include three phase windings. The stator core 200 can be provided with a plurality of stator slots 210, which can be formed on the inner wall of the stator core 200. The stator slots 210 can be arranged along the circumferential direction of the inner wall of the stator core 200, and the stator slots 210 can be spaced apart at a predetermined slot pitch on the stator core 200. The upper and lower end faces of the stator core 200 can be defined as the hairpin end 1001 and the welding end 1002, respectively, and the stator winding 100 can be inserted into the stator core 200 from the side of the hairpin end 1001, and the stator winding 100 can be welded at the welding end 1002.

[0052] Referring to Figure 2 As shown, in some embodiments, the plurality of stator slots 210 in the circumferential direction of the stator core 200 can be defined as the first stator slot 210, the second stator slot 210, the third stator slot 210, the fourth stator slot 210, and so on. For example, the stator core 200 can be arranged with 54 stator slots 210 along the circumferential direction. Each stator slot 210 can be provided with a plurality of slot layers, and each stator slot 210 can be provided with M slot layers, M being an even number. For example, each stator slot 210 can be provided with 6 slot layers. For example, the 6 slot layers along the radial direction of the stator core 200 from the outside to the inside can be sequentially defined as the L6 layer slot layer, the L5 layer slot layer, the L4 layer slot layer, the L3 layer slot layer, the L2 layer slot layer, and the L1 layer slot layer, i.e., the L6 layer slot layer can be located near the slot bottom side of the stator slot 210, and the L1 layer slot layer can be located near the slot opening side of the stator slot 210. In addition, the specific label of the slot layer of each stator slot 210 is not limited, and the embodiments in the present application are arranged in the order of 1-6 from the slot opening of the stator slot 210 to the slot bottom of the stator slot 210, and in other embodiments, the slot layers can also be arranged in the order of 1-6 from the slot bottom of the stator slot 210 to the slot opening of the stator slot 210.

[0053] Referring to Figures 3-7As shown, in some embodiments, the U-shaped coils include a full-pitch U-shaped coil 110, a first long-pitch U-shaped coil 120, a first short-pitch U-shaped coil 130, a second long-pitch U-shaped coil 140, and a second short-pitch U-shaped coil 150. The full-pitch U-shaped coil 110, the first long-pitch U-shaped coil 120, the first short-pitch U-shaped coil 130, the second long-pitch U-shaped coil 140, and the second short-pitch U-shaped coil 150 can include one connection section 101, two straight sections 102, and two twisted head sections 103. The two ends of the connection section 101 are respectively connected with one straight section 102. The two straight sections 102 pass through the stator slots 210 of the stator core 200 and are twisted at the welding end 1002 to form the two twisted head sections 103. The span of the full-pitch U-shaped coil 110 is denoted as y1, which can be equal to the pole pitch of the stator winding 100, denoted as y, for example, y1=y. The span of the first long-pitch U-shaped coil 120 is denoted as y2, which can be greater than the pole pitch of the stator winding 100, for example, y2=y+1. The span of the first short-pitch U-shaped coil 130 is denoted as y3, which can be less than the pole pitch of the stator winding 100, for example, y3=y-1. The span of the second long-pitch U-shaped coil 140 is denoted as y4, which can be greater than the pole pitch of the stator winding 100, for example, y4=y+2. The span of the second short-pitch U-shaped coil 150 is denoted as y5, which can be less than the pole pitch of the stator winding 100, for example, y5=y-2.

[0054] As shown in FIGS. 3-7, in some embodiments, in each branch of each phase winding, the two straight sections 102 of the full-pitch U-shaped coil 110 can be radially different by one slot layer, the two straight sections 102 of the first long-pitch U-shaped coil 120 can be radially different by one slot layer, and the two straight sections 102 of the first short-pitch U-shaped coil 130 can be radially different by one slot layer. The two straight sections 102 of the second long-pitch U-shaped coil 140 can be radially different by one slot layer, and the two straight sections 102 of the second short-pitch U-shaped coil 150 can be radially different by one slot layer. The two twisted head sections 103 of the full-pitch U-shaped coil 110, the first long-pitch U-shaped coil 120, the first short-pitch U-shaped coil 130, the second long-pitch U-shaped coil 140, and the second short-pitch U-shaped coil 150 extend the same distance along one side of the welding end 1002 of the stator core 200, which can be equal to half of the pole pitch. The two twisted head sections 103 of the full-pitch U-shaped coil 110, the first long-pitch U-shaped coil 120, the first short-pitch U-shaped coil 130, the second long-pitch U-shaped coil 140, and the second short-pitch U-shaped coil 150 can be away from each other, and the extension directions of the two twisted head sections 103 of the full-pitch U-shaped coil 110, the first long-pitch U-shaped coil 120, the first short-pitch U-shaped coil 130, the second long-pitch U-shaped coil 140, and the second short-pitch U-shaped coil 150 can be towards opposite directions. For example, the extension direction of one twisted head section 103 can be towards the clockwise direction or the counterclockwise direction, and the extension direction of the other twisted head section 103 can be opposite.

[0055] As shown in FIG. 8, in some embodiments, in each branch of each phase winding, the two straight segments 102 of the same-layer jumper 160 can be radially different by one slot layer. The two twisted head segments 103 of the same-layer jumper 160 can extend the same distance along one side of the welding end 1002 of the stator core 200, which can be equal to half of the pole pitch. The two twisted head segments 103 of the same-layer jumper 160 can extend in the same direction, for example, the extension direction of the twisted head segments 103 can be toward the clockwise direction or the counterclockwise direction. Figure 8 As shown in FIG. 9, in some embodiments, the lead coil 170 can include one connecting segment 101, one straight segment 102, and one twisted head segment 103. One end of the connecting segment 101 is connected to the straight segment 102. The straight segment 102 passes through the stator slot 210 of the stator core 200 and is twisted at the welding end 1002 to form the twisted head segment 103. One twisted head segment 103 of the lead coil 170 can extend the same distance along one side of the welding end 1002 of the stator core 200, which can be equal to half of the pole pitch. In each branch of each phase winding, the twisted head segments 103 of the two lead coils 170 can extend in the same direction. For example, the extension direction of the two twisted head segments 103 can be toward the clockwise direction or the counterclockwise direction. In each branch of each phase winding, the two lead coils 170 can be located in the first slot layer.

[0056] As shown in FIG. 9, in some embodiments, the lead coil 170 can include one connecting segment 101, one straight segment 102, and one twisted head segment 103. One end of the connecting segment 101 is connected to the straight segment 102. The straight segment 102 passes through the stator slot 210 of the stator core 200 and is twisted at the welding end 1002 to form the twisted head segment 103. One twisted head segment 103 of the lead coil 170 can extend the same distance along one side of the welding end 1002 of the stator core 200, which can be equal to half of the pole pitch. In each branch of each phase winding, the twisted head segments 103 of the two lead coils 170 can extend in the same direction. For example, the extension direction of the two twisted head segments 103 can be toward the clockwise direction or the counterclockwise direction. In each branch of each phase winding, the two lead coils 170 can be located in the first slot layer.

[0057] As shown in FIG. 9, in some embodiments, the lead coil 170 can include one connecting segment 101, one straight segment 102, and one twisted head segment 103. One end of the connecting segment 101 is connected to the straight segment 102. The straight segment 102 passes through the stator slot 210 of the stator core 200 and is twisted at the welding end 1002 to form the twisted head segment 103. One twisted head segment 103 of the lead coil 170 can extend the same distance along one side of the welding end 1002 of the stator core 200, which can be equal to half of the pole pitch. In each branch of each phase winding, the twisted head segments 103 of the two lead coils 170 can extend in the same direction. For example, the extension direction of the two twisted head segments 103 can be toward the clockwise direction or the counterclockwise direction. In each branch of each phase winding, the two lead coils 170 can be located in the first slot layer. Figure 9 As shown in FIG. 9, in some embodiments, the lead coil 170 can include one connecting segment 101, one straight segment 102, and one twisted head segment 103. One end of the connecting segment 101 is connected to the straight segment 102. The straight segment 102 passes through the stator slot 210 of the stator core 200 and is twisted at the welding end 1002 to form the twisted head segment 103. One twisted head segment 103 of the lead coil 170 can extend the same distance along one side of the welding end 1002 of the stator core 200, which can be equal to half of the pole pitch. In each branch of each phase winding, the twisted head segments 103 of the two lead coils 170 can extend in the same direction. For example, the extension direction of the two twisted head segments 103 can be toward the clockwise direction or the counterclockwise direction. In each branch of each phase winding, the two lead coils 170 can be located in the first slot layer.

[0058] Figures 1-9 ​As shown, in some embodiments, each phase winding can include multiple branches, for example, in this application, each phase winding can include three branches. Each branch can include a forward coil group, a reverse coil group, a same-layer jumper 160, and two outgoing coils 170. The same-layer jumper 160 can be connected between the forward coil group and the reverse coil group, one outgoing coil 170 can be connected with the twisted head section 103 of the forward coil group, and the other outgoing coil 170 can be connected with the twisted head section 103 of the reverse coil group, to form a complete branch. A forward coil group can include multiple full-pitch U-shaped coils 110, a first long-pitch U-shaped coil 120, and a second short-pitch U-shaped coil 150. After the full-pitch U-shaped coils 110 in the forward coil group are connected circumferentially for one turn, they can be connected to the next turn radially through a first long-pitch U-shaped coil 120, or can be connected to the next turn radially through a second short-pitch U-shaped coil 150. A reverse coil group can include multiple full-pitch U-shaped coils 110, a first short-pitch U-shaped coil 130, and a second long-pitch U-shaped coil 140. After the full-pitch U-shaped coils 110 in the reverse coil group are connected circumferentially for one turn, they can be connected to the next turn radially through a first short-pitch U-shaped coil 130, or can be connected to the next turn radially through a second long-pitch U-shaped coil 140. The winding method of the reverse coil group is the same as that of the forward coil group, and the winding direction is opposite.

[0059] As shown in FIG. 6, the winding of the A-phase winding is shown in detail. The winding of the B-phase winding and the C-phase winding is the same as that of the A-phase winding, and the difference is that the slot numbers of the incoming end and the outgoing end are different. For example, the incoming end of the A-phase winding is 1st slot, 2nd slot, and 3rd slot, respectively, the incoming end of the B-phase winding can be 7th slot, 8th slot, and 9th slot, respectively, and the incoming end of the C-phase winding can be 13th slot, 14th slot, and 15th slot, respectively. Figures 1-9 As shown in FIG. 6, in some embodiments, the straight sections 102 of the radially adjacent full-pitch U-shaped coils 110 in each forward coil group or each reverse coil under a magnetic pole differ by two slot layers radially. In each forward coil group, the straight sections 102 of the radially adjacent first long-pitch U-shaped coils 120 differ by two slot layers radially, or the straight sections 102 of the radially adjacent first long-pitch U-shaped coils 120 and the straight sections 102 of the second short-pitch U-shaped coils 150 differ by two slot layers radially. In each reverse coil group, the straight sections 102 of the radially adjacent first short-pitch U-shaped coils 130 differ by two slot layers radially, or the straight sections 102 of the radially adjacent first short-pitch U-shaped coils 130 and the straight sections 102 of the second long-pitch U-shaped coils 140 differ by two slot layers radially.

[0060] As shown in FIG. 6, the winding of the A-phase winding is shown in detail. The winding of the B-phase winding and the C-phase winding is the same as that of the A-phase winding, and the difference is that the slot numbers of the incoming end and the outgoing end are different. For example, the incoming end of the A-phase winding is 1st slot, 2nd slot, and 3rd slot, respectively, the incoming end of the B-phase winding can be 7th slot, 8th slot, and 9th slot, respectively, and the incoming end of the C-phase winding can be 13th slot, 14th slot, and 15th slot, respectively. Figure 2 As shown in FIG. 6, the winding of the A-phase winding is shown in detail. The winding of the B-phase winding and the C-phase winding is the same as that of the A-phase winding, and the difference is that the slot numbers of the incoming end and the outgoing end are different. For example, the incoming end of the A-phase winding is 1st slot, 2nd slot, and 3rd slot, respectively, the incoming end of the B-phase winding can be 7th slot, 8th slot, and 9th slot, respectively, and the incoming end of the C-phase winding can be 13th slot, 14th slot, and 15th slot, respectively. Figure 2The winding mode of the motor is shown in the form of 6-pole 54-slot 6-conductor per slot 3-slot-per-pole-per-phase. Figure 2 A1X1 is the first branch, A2X2 is the second branch, and A3X3 is the third branch. A1, A2, and A3 are the incoming wire ends of the winding, X1, X2, and X3 are the outgoing wire ends of the winding, and the welding end 1002 and the hairpin end 1001 are distributed on both sides of the winding. In the winding development diagram, from left to right, there are 1st layer, 2nd layer, 3rd layer, 4th layer, 5th layer, and 6th layer in each slot.

[0061] The specific winding mode of the first branch A1X1 of the A-phase winding is as follows: 1(1) represents the 1st layer of the 1st stator slot 210.

[0062] A1->1(1)->10(2)->19(1)->28(2)->37(1)->46(2)->2(3)->11(4)->20(3)->29(4)->38(3)->47(4)->3(5)->12(6)->21(5)->30(6)->39(5)->48(6)->1(6)->46(5)->37(6)->28(5)->19(6)->10(5)->2(4)->47(3)->38(4)->29(3)->20(4)->11(3)->3(2)->48(1)->39(2)->30(1)->21(2)->12(1)->X1.

[0063] The specific winding mode of the second branch A2X2 of the A-phase winding is as follows:

[0064] A2->2(1)->11(2)->20(1)->29(2)->38(1)->47(2)->3(3)->12(4)->21(3)->30(4)->39(3)->48(4)->1(5)->10(6)->19(5)->28(6)->37(5)->46(6)->2(6)->47(5)->38(6)->29(5)->20(6)->11(5)->3(4)->48(3)->39(4)->30(3)->21(4)->12(3)->1(2)->46(1)->37(2)->28(1)->19(2)->10(1)->X2.

[0065] The specific winding mode of the third branch A3X3 of the A-phase winding is as follows:

[0066] A3->3(1)->12(2)->21(1)->30(2)->39(1)->48(2)->1(3)->10(4)->19(3)->28(4)->37(3)->46(4)->2(5)->11(6)->20(5)->29(6)->38(5)->47(6)->3(6)->48(5)->39(6)->30(5)->21(6)->12(5)->1(4)->46(3)->37(4)->28(3)->19(4)->10(3)->2(2)->47(1)->38(2)->29(1)->20(2)->11(1)->X3.

[0067] Referring to Figure 2 As shown in FIG. 1, in some embodiments, from the winding mode above, in the first parallel branch A1X1, after the whole-pitch U-shaped coils 110 in the positive coil group are circumferentially connected for one turn, they can be connected to the next turn in the radial direction through a first long-pitch U-shaped coil 120. The whole-pitch U-shaped coils 110 can be located in the 2m-1 layer and 2m layer slot layers, and the first long-pitch U-shaped coil 120 can be located in the 2m layer and 2m+1 layer slot layers, 2m+1<2N. After the whole-pitch U-shaped coils 110 in the reverse coil group are circumferentially connected for one turn, they can be connected to the next turn in the radial direction through a first short-pitch U-shaped coil 130. The whole-pitch U-shaped coils 110 can be located in the 2m-1 layer and 2m layer slot layers, and the first short-pitch U-shaped coil 130 can be located in the 2m layer and 2m+1 layer slot layers. The span of the same-layer jumper 160 is y4=y-2.

[0068] Referring to Figure 2As shown, in some embodiments, from the above winding mode, in the second parallel branch A2X2, or in the second parallel branch A3X3, after the full-pitch U-shaped coil 110 in the forward coil group is connected to the first week in the circumferential direction, it can be connected to the second week in the radial direction through a first long-pitch U-shaped coil 120. After the full-pitch U-shaped coil 110 in the forward coil group is connected to the second week in the circumferential direction, it can be connected to the next week in the radial direction through a second short-pitch U-shaped coil 150. The full-pitch U-shaped coil 110 can be located in the 2m-1 layer and 2m layer slot layers, and the first long-pitch U-shaped coil 120 and the second short-pitch U-shaped coil 150 can be located in the 2m layer and 2m+1 layer slot layers. After the full-pitch U-shaped coil 110 in the reverse coil group is connected to the first week in the circumferential direction, it can be connected to the second week in the radial direction through a first short-pitch U-shaped coil 130. After the full-pitch U-shaped coil 110 in the reverse coil group is connected to the second week in the circumferential direction, it can be connected to the next week in the radial direction through a second long-pitch U-shaped coil 140. The full-pitch U-shaped coil 110 can be located in the 2m-1 layer and 2m layer slot layers, the first short-pitch U-shaped coil 130 can be located in the 2m layer and 2m+1 layer slot layers, and the second long-pitch U-shaped coil 140 can be located in the 2m layer and 2m+1 layer slot layers. The span of the same layer jumper 160 is y4=y+1.

[0069] Please refer to Figure 2 As shown, in some embodiments, from the above winding mode, the incoming end A1 of the first parallel branch A1X1 is in the 1st layer slot layer of the 1st stator slot 210, and the outgoing end X1 is in the 1st layer slot layer of the 12th stator slot 210. The incoming end A2 of the second parallel branch A2X2 is in the 1st layer slot layer of the 2nd stator slot 210, and the outgoing end X2 is in the 1st layer slot layer of the 10th stator slot 210. The incoming end A3 of the third parallel branch A3X3 is in the 1st layer slot layer of the 3rd stator slot 210, and the outgoing end X3 is in the 1st layer slot layer of the 11th stator slot 210. The incoming ends A1, A2, A3 of the three parallel branches are sequentially different by one stator slot 210, and the outgoing ends X1, X2, X3 of the three parallel branches are sequentially different by one stator slot 210. The incoming ends A1, A2, A3 and the outgoing ends X1, X2, X3 of each parallel branch are distributed in the same slot layer. In the first branch of each phase winding, the incoming end and the outgoing end are different by y+2 stator slots 210 in the circumferential direction. That is, in the first branch of each phase winding, the two outgoing coils 170 are different by y+2 stator slots 210 in the circumferential direction of the stator core 200. In the second branch of each phase winding, the incoming end and the outgoing end are different by y-1 stator slots 210 in the circumferential direction. In the third branch of each phase winding, the incoming end and the outgoing end are different by y-1 stator slots 210 in the circumferential direction. It should be noted that "difference" can refer to the difference between two slot numbers, for example, the difference between the 3rd stator slot 210 and the 9th stator slot 210 is 6 slots. In addition, "difference" can also refer to the difference between two slot layers, for example, the difference between the L1 layer slot layer and the L4 layer slot layer is 3 slot layers.

[0070] Referring to Figure 10 In some embodiments, the flat wire coils of each stator slot 210 belong to the same phase winding, the interlayer insulation paper is cancelled, the slot fill factor of the stator slot 210 in the stator winding 100 is improved, the resistance of the stator winding 100 is reduced, the copper loss of the motor is reduced, and the efficiency of the motor is improved.

[0071] Referring to Figure 11 In some embodiments, three branches of a phase winding can form one parallel branch by being connected in series. Referring to Figure 12 In some embodiments, three branches of a phase winding can also form three parallel branches by being connected in parallel. Referring to Figure 11 and Figure 12 In this embodiment, star connection is used between the three phase windings. In other embodiments, of course, delta connection can also be used.

[0072] The above description is merely preferred embodiments of the present application and a description of the principles of the technology used, and those skilled in the art should understand that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or equivalent features thereof without departing from the inventive concept, for example, technical solutions formed by mutual replacement of the above features and technical features disclosed in the present application (but not limited to) having similar functions.

[0073] In addition to the technical features described in the specification, the remaining technical features are known to those skilled in the art, and in order to highlight the innovative features of the present application, the remaining technical features will not be described here.

Claims

1. A motor winding, characterized in that, include: Multiphase windings, each phase of the winding including multiple branches, each branch including: A positive coil group includes multiple U-shaped coils, wherein the span of the U-shaped coils in the positive coil group is y, y-2, y+1, where y represents the pole pitch of the motor; A reverse coil group comprising a plurality of U-shaped coils, wherein the spans of the U-shaped coils in the reverse coil group are y, y-1, and y+2; and A jumper wire with a span of y-2 or y+1 is provided, which connects the positive coil group and the reverse coil group. In this configuration, the U-shaped coil of the forward coil group is connected circumferentially for one turn and then radially connected to the next turn; the reverse coil group has the same winding method as the forward coil group, but the winding direction is opposite. In the first branch of each phase winding, within the positive coil group, after the U-shaped coil with a span of y is circumferentially connected for one turn, it is radially connected to the next turn through a U-shaped coil with a span of y+1; the U-shaped coil with a span of y is located in the slot layers of layer 2m-1 and layer 2m, and the U-shaped coil with a span of y+1 can be located in the slot layers of layer 2m and layer 2m+1, where 2m+1 < 2N.

2. The motor winding according to claim 1, characterized in that, In the first branch of each phase winding, within the reverse coil group, after the U-shaped coil with a span of y is circumferentially connected for one turn, it is radially connected to the next turn through a U-shaped coil with a span of y-1.

3. The motor winding according to claim 1, characterized in that, In the remaining branches of each phase winding, within the positive coil group, after the U-shaped coil with a span of y is circumferentially connected to the first cycle, it is radially connected to the second cycle through a U-shaped coil with a span of y+1. After the U-shaped coil with a span of y is circumferentially connected to the second cycle, it is radially connected to the next cycle through a U-shaped coil with a span of y-2.

4. The motor winding according to claim 3, characterized in that, In the remaining branches of each phase winding, within the reverse coil group, after the U-shaped coil with a span of y is circumferentially connected to the first cycle, it is radially connected to the second cycle through a U-shaped coil with a span of y-1. After the U-shaped coil with a span of y is circumferentially connected to the second cycle, it is radially connected to the next cycle through a U-shaped coil with a span of y+2.

5. The motor winding according to claim 1, characterized in that, Each of the aforementioned branches also includes: The number of lead coils is at least two, one of which serves as a lead end and the other as an output end.

6. The motor winding according to claim 1, characterized in that, Each positive coil group or each negative coil group under a magnetic pole is radially adjacent to the U-shaped coils by two slot layers.

7. A stator assembly, characterized in that, include: The iron core is provided with multiple stator slots, which are distributed along the circumference of the iron core; Multiphase windings, wherein the windings are wound on the iron core, each phase of the winding includes multiple branches, and each branch includes: A positive coil group includes multiple U-shaped coils, wherein the span of the U-shaped coils in the positive coil group is y, y-2, y+1, where y represents the pole pitch of the motor; A reverse coil group comprising a plurality of U-shaped coils, wherein the spans of the U-shaped coils in the reverse coil group are y, y-1, and y+2; and A jumper wire with a span of y-2 or y+1 is provided, which connects the positive coil group and the reverse coil group. In this configuration, the U-shaped coil of the forward coil group is connected circumferentially for one turn and then radially connected to the next turn; the reverse coil group has the same winding method as the forward coil group, but the winding direction is opposite. In the first branch of each phase winding, within the positive coil group, after the U-shaped coil with a span of y is circumferentially connected for one turn, it is radially connected to the next turn through a U-shaped coil with a span of y+1; the U-shaped coil with a span of y is located in the slot layers of layer 2m-1 and layer 2m, and the U-shaped coil with a span of y+1 can be located in the slot layers of layer 2m and layer 2m+1, where 2m+1 < 2N.

8. The stator assembly according to claim 7, characterized in that, The stator slots of the iron core are provided with M slot layers, and M is an even number.

9. The stator assembly according to claim 8, characterized in that, The jumper wires on the same layer are located in the Mth slot layer.

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