Motor winding and stator assembly

Abstract

The present invention proposes a motor winding and stator assembly, which relates to the field of motors, including: a multi-phase winding, each phase winding includes multiple parallel branches, the branch includes three connecting sections connected in series in sequence, the connecting section includes the outermost same-layer wave-wound coil, the first stacked coil group, the innermost same-layer wave-wound coil and the second stacked coil group connected in series in sequence, wherein the spans of the outermost same-layer wave-wound coils in the three connecting sections are y+1, y‑2, y+1 or y+2, y‑1, y‑1 respectively; the spans of the innermost same-layer wave-wound coils in the three connecting sections are y‑2, y+1, y+1 or y‑1, y+2, y‑1 respectively; the first stacked coil group and the second stacked coil group each include multiple full-pitch coils connected in series; the full-pitch coil includes two straight segments, and the multiple full-pitch coils are radially arranged back and forth between the sub-outer layer and the sub-inner layer of the iron core slots in two motor iron core slots with a span of y. The winding of the present invention has a small number of linear shapes, which reduces production costs and can better meet the requirements of high-voltage driving.

Description

Technical Field

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

[0002] New energy vehicle drive motors using flat wire windings offer advantages such as light weight, high power density, and high efficiency, making them a growing trend in drive motor development. As motor power and speed increase, the number of slots per pole and phase in the winding also increases. From a manufacturing perspective, wave windings require a large number of wires, increasing the motor's process complexity and manufacturing cost. From an electrical connection perspective, the voltage difference between conductors of different layers within the same slot of a wave winding is high, which can easily lead to interlayer breakdown, resulting in short circuits and motor failure. Summary of the Invention

[0003] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a motor winding and stator assembly to improve the existing motor winding line number, complex motor process, high manufacturing cost, and the wave winding in the same slot, the voltage difference between the conductors of different layers is high, which is easy to cause interlayer breakdown, resulting in short circuit and motor failure.

[0004] To achieve the above and other related objectives, the present invention provides a motor winding, comprising:

[0005] A multi-phase winding, wherein each phase of the winding includes multiple parallel branches, each branch including three connecting sections connected in series along a first direction, each connecting section including an outermost same-layer wave-wound coil, a first stacked coil group, an innermost same-layer wave-wound coil, and a second stacked coil group connected in series, the first stacked coil group being located between the outermost same-layer wave-wound coil and the innermost same-layer wave-wound coil, and the second stacked coil group being located to one side of the first stacked coil group along the first direction;

[0006] The first stacked coil group and the second stacked coil group each include a plurality of coils of equal spacing connected in series;

[0007] The spans of the outermost wave-wound coils of the same layer in the three connecting sections are y+1, y-2, y+1 or y+2, y-1, y-1 respectively;

[0008] The spans of the innermost wave-wound coils of the same layer in the three connecting sections are y-2, y+1, y+1 or y-1, y+2, y-1 respectively;

[0009] The full-pitch coil includes two straight line segments. Multiple full-pitch coils are radially arranged back and forth between the sub-outer layer and the sub-inner layer of the iron core slots in two motor iron core slots with a span of y, and are connected in series end to end. The straight line segments in the multiple series-connected full-pitch coils are one layer apart in sequence, and y represents the pole pitch of the motor.

[0010] In one embodiment of the present invention, the outermost same-layer wave-wound coil and the innermost same-layer wave-wound coil each include two straight line segments, one end of the two straight line segments are connected together by a connecting segment, and the other end is bent outward in the same direction relative to the straight line segment to form a twist segment.

[0011] In one embodiment of the present invention, the bending directions of the twist sections on the outermost wave-wound coil and the innermost wave-wound coil are opposite.

[0012] In one embodiment of the present invention, one end of the two straight segments in the full-pitch coil is bent inward in opposite directions relative to the straight segments to form a twist segment.

[0013] In one embodiment of the present invention, the extension length of the twist segment relative to the straight segment is span.

[0014] In one embodiment of the present invention, two adjacent coils are welded together through the twist section to form a welding section, and the span of the welding section is y.

[0015] In one embodiment of the present invention, each branch circuit is provided with an input terminal and an output terminal, and the input terminal and the output terminal of each branch circuit are located in two adjacent slot layers on different wire slots on the motor core.

[0016] In one embodiment of the present invention, the incoming wire ends of the plurality of branches are separated by one wire slot.

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

[0018] The iron core is provided with a plurality of wire slots, wherein the wire slots are distributed along the circumference of the iron core;

[0019] A multi-phase winding, wherein each phase of the winding includes multiple parallel branches, each branch including three connecting sections connected in series in a first direction, each connecting section including an outermost same-layer wave-wound coil, a first stacked coil group, an innermost same-layer wave-wound coil, and a second stacked coil group connected in series in a first direction, wherein the first stacked coil group is located between the outermost same-layer wave-wound coil and the innermost same-layer wave-wound coil, and the second stacked coil group is located to one side of the first stacked coil group in the first direction;

[0020] The first stacked coil group and the second stacked coil group each include a plurality of coils of equal spacing connected in series;

[0021] The spans of the outermost wave-wound coils of the same layer in the three connecting sections are y+1, y-2, y+1 or y+2, y-1, y-1 respectively;

[0022] The spans of the innermost wave-wound coils of the same layer in the three connecting sections are y-2, y+1, y+1 or y-1, y+2, y-1 respectively;

[0023] The full-pitch coil includes two straight line segments. Multiple full-pitch coils are radially arranged back and forth between the sub-outer layer and the sub-inner layer of the iron core slots in two motor iron core slots with a span of y, and are connected in series end to end. The straight line segments in the multiple series-connected full-pitch coils are one layer apart in sequence, and y represents the pole pitch of the motor.

[0024] In one embodiment of the present invention, a plurality of slot layers are provided in the wire slots of the iron core, and the number of the slot layers is an even number greater than or equal to 6.

[0025] The present invention provides a motor winding and stator assembly, wherein the number of winding lines is small, thereby reducing the number of molds, reducing the complexity of the process, and reducing the production cost.

[0026] The present invention proposes a motor winding and stator assembly, which reduces the voltage difference between conductors of different layers in the same slot through the reasonable arrangement of the above-mentioned stacked coils and the same-layer wave-wound coils, making it less likely to cause interlayer breakdown and better adapting to the requirements of high-voltage drive.

[0027] The present invention proposes a motor winding and stator assembly, in which each parallel branch is completely symmetrical on the magnetic circuit and its electrical parameters such as resistance and inductance are completely equal, eliminating the loop current problem caused by the asymmetric structure, reducing noise and improving efficiency.

[0028] The present invention proposes a motor winding and stator assembly, in which the flat wire conductors in each stator slot belong to parallel branches of the same phase, and the flat wire conductors are distributed in the same phase, thereby eliminating the phase-to-phase insulation between the flat wire conductors, increasing the copper fill rate of the winding, and further improving the efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 Schematic diagram of the structure of a stator assembly in one embodiment of the present invention.

[0031] Figure 2 Schematic diagram of the structure of the core wire slot in one embodiment of the present invention.

[0032] Figure 3 FIG. 1 is a schematic structural diagram of a winding branch in one embodiment of the present invention.

[0033] Figure 4 Schematic diagram of the structure of the outermost same-layer wave-wound coil in one embodiment of the present invention.

[0034] Figure 5 Schematic diagram of the structure of another outermost same-layer wave-wound coil in one embodiment of the present invention.

[0035] Figure 6 Schematic diagram of the structure of the innermost same-layer wave-wound coil in one embodiment of the present invention.

[0036] Figure 7 Schematic diagram of the structure of another outermost same-layer wave-wound coil in one embodiment of the present invention.

[0037] Figure 8 FIG. 1 is a schematic structural diagram of the full-pitch coils in a stacked coil assembly according to an embodiment of the present invention.

[0038] Figure 9 FIG. 1 is an expanded view of the first parallel branch A1X1 of the A-phase winding in one embodiment of the present invention.

[0039] Figure 10 FIG. 1 is an expanded view of the second parallel branch A2X2 of the A-phase winding in one embodiment of the present invention.

[0040] Figure 11 FIG. 1 is an expanded view of the third parallel branch A3X3 of the A-phase winding in one embodiment of the present invention.

[0041] Figure 12 FIG. 1 is an expanded view of the first parallel branch A1X1 of the A-phase winding in another embodiment of the present invention.

[0042] Figure 13 FIG. 1 is an expanded view of the second parallel branch A2X2 of the A-phase winding in another embodiment of the present invention.

[0043] Figure 14 FIG. 1 is an expanded view of the third parallel branch A3X3 of the A-phase winding in another embodiment of the present invention.

[0044] Figure 15 FIG. 1 is a schematic diagram of three parallel branches connected in a star configuration in one embodiment of the present invention.

[0045] Description of labels:

[0046] Iron core 100; wire slot 110; outermost same-layer wave-wound coil 121; innermost same-layer wave-wound coil 122; first stacked coil group 123; second stacked coil group 124; full-pitch coil 1203; straight section 1001; connecting section 1002; welding section 1003; first twist section 1004; second twist section 1005; first connecting section 111; second connecting section 112; third connecting section 113. DETAILED DESCRIPTION

[0047] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0048] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0049] See also Figure 1 and Figure 2 As shown, the present invention provides a stator assembly, in which a winding and an iron core 100 are provided. The winding is provided on the iron core 100. Specifically, the iron core 100 is cylindrical in shape, and a plurality of wire slots 110 are provided on the iron core 100. The plurality of wire slots 110 are distributed along the circumference of the iron core 100. The wire slots 110 are provided through the iron core 100. Therefore, the winding can be wound in the wire slots 110 of the iron core 100. It should be noted that in the iron core 100 of the stator, along the circumferential direction of the iron core 100, a plurality of wire slots 110 can be defined in sequence as the 1st slot, the 2nd slot, ..., the i-th slot, ..., the N-th slot, ... Each cable slot 110 is provided with r slot layers, and the r slot layers are respectively designated as the 1st layer, the 2nd layer, ..., the jth layer, ..., the rth layer, from the inner side to the outer side of the core 100 in the radial direction, with the 1st layer being the innermost layer and the rth layer being the outermost layer. In an embodiment, the total number of slot layers within the cable slot 110 is an even number greater than or equal to 6. Therefore, conductors within different cable slots 110 and within different slot layers may be named using the format N(L), where N represents the position of the cable slot 110 in which the conductor is located, and L represents the number of slot layers within the cable slot 110.

[0050] See also Figures 1 to 3As shown, in one embodiment, the motor is a multi-phase motor, and the windings within the motor may be multi-phase windings. Each phase winding may include multiple parallel branches, and the winding corresponding to each branch is wound on the iron core 100. For any branch, the branch includes three connecting segments connected in series along a first direction, and each connecting segment includes an outermost same-layer wave-wound coil 121, a first stacked coil group 123, an innermost same-layer wave-wound coil 122, and a second stacked coil group 124 connected in series. The first stacked coil group 123 is located between the outermost same-layer wave-wound coil 121 and the innermost same-layer wave-wound coil 122, and the second stacked coil group 124 is located on one side of the first stacked coil group 123 along the first direction. It should be noted that the first direction may be a direction along which the slot number increases on the iron core 100.

[0051] See also Figures 3 to 8 As shown, in this embodiment, the first stacked coil group 123 and the second stacked coil group 124 each include a plurality of series-connected full-pitch coils 1203, wherein each of the outermost same-layer wave-wound coils 121, the innermost same-layer wave-wound coils 122, and the full-pitch coils 1203 include two straight segments 1001, and the two straight segments 1001 of the outermost same-layer wave-wound coils 121 are located at the outermost slot layer of the motor core slot; the two straight segments 1001 of the innermost same-layer wave-wound coils 122 are located at the outermost slot layer of the motor core slot; 001 is located in the innermost slot layer of the motor core slot; the two straight segments 1001 of the full-pitch coil 1203 are located in two adjacent slot layers, and the span between them is y. Specifically, multiple full-pitch coils 1203 are radially reciprocated between the sub-outer layer and the sub-inner layer of the slot 110 on the core in two slots with a span of y, and are connected in series end to end, and the straight segments 1001 in multiple series-connected full-pitch coils 1203 are one layer apart in sequence, and y represents the pole pitch of the motor.

[0052] See also Figures 3 to 8 As shown, in this embodiment, the outermost same-layer wave-wound coil 121, the innermost same-layer wave-wound coil 122 and one end of the two straight segments 1001 in the full-pitch coil are all connected together through a connecting segment 1002, and the two adjacent full-pitch coils 1203 are connected in series through a welding segment 1003, and the outermost same-layer wave-wound coil 121 and the first stacked coil group 123, the first stacked coil group 123 and the innermost same-layer wave-wound coil 122, and the innermost same-layer wave-wound coil 122 and the second stacked coil group 124 are all connected in series through a welding segment 1003.

[0053] See also Figures 3 to 8As shown, correspondingly, two adjacent connecting segments are also connected in series through the welding segment 1003, that is, the second stacked coil group 124 of the previous connecting segment and the outermost same-layer wave-wound coil 121 of another adjacent connecting segment are connected in series through the welding segment 1003.

[0054] See also Figures 3 to 8 As shown, in this embodiment, the outermost same-layer wave-wound coil 121 in the starting connection section of each branch is the starting section of the connection section, that is, the first straight segment 1001 in the outermost same-layer wave-wound coil 121 is the input end, the tail straight segment 1001 is connected in series with the first stacked coil group 123 through the welding section 1003, and the last straight segment 1001 of the second stacked coil group 124 in the terminal connection section is the output end, and the input end and output end of each branch are located in adjacent slot layers of different wire slots. For example, when the input end is located in the L layer, the output end is located in the L-1 layer. In this embodiment, the incoming ends of the plurality of branches are sequentially separated by one slot. It should be noted that "difference" refers to the difference between the numbers of two slots, for example, there is a difference of 6 slots between slot No. 3 and slot No. 9, that is, the incoming ends of each branch are sequentially located in two adjacent slots. For example, when the incoming end of one of the branches is located in slot N, the incoming ends of the remaining branches are sequentially located in slot N+1 and slot N+2.

[0055] See also Figures 3 to 8 As shown, in this embodiment, each branch includes a first connecting section, a second connecting section, and a third connecting section, wherein the outermost same-layer wave-wound coil 121 of the first connecting end is located in the outermost slot layer of the motor core slot, and the span of the outermost same-layer wave-wound coil 121 of the first connecting section is y+1 or y+2, that is, the span between two straight segments 1001 in the outermost same-layer wave-wound coil 121 is y+1 or y+2, where y represents the motor pole pitch, and the winding direction of the outermost same-layer wave-wound coil 121 is the first direction. When the span of the outermost same-layer wave-wound coil 121 is y+1, within the outermost same-layer wave-wound coil 121, when the first straight segment 1001 is located in the i-th slot, then the other straight segment 1001 of the outermost same-layer wave-wound coil 121 is located in the i+y+1 slot or the iy-1 slot. It should be noted that within the outermost wave-wound coil 121, the two straight segments 1001 are located in the same slot layer within different slots. For example, when the straight segment 1001 connecting the incoming line terminal is located at position N (L) on the core 100, the other straight segment 1001 is located at position N+y+1 (L) or N+y+2 (L).

[0056] See also Figures 3 to 8As shown, in this embodiment, the first stacked coil group 123 includes multiple full-pitch coils 1203, and two adjacent full-pitch coils 1203 are connected in series via a welding section 1003 and are located between the outermost same-layer wave-wound coil 121 and the innermost same-layer wave-wound coil 122, and two straight line segments in the same full-pitch coil are located in two adjacent slot layers, that is, the multiple full-pitch coils 1203 in the first stacked coil group 123 are all located in the sub-outer layer, the sub-inner layer, and positions therebetween of the iron core 100, and the straight line segments 1001 in the multiple series-connected full-pitch coils 1203 in the first stacked coil group 123 are one layer apart and are arranged back and forth between two motor iron core slots with a span y, and the first and last full-pitch coils 1203 in the first stacked coil group 123 are connected in series with the outermost same-layer wave-wound coil 121 and the innermost same-layer wave-wound coil 122 respectively via the welding section 1003.

[0057] See also Figures 3 to 8 As shown, in this embodiment, the straight line segment 1001 in the first stacked coil group 123 connecting to the outermost wave-wound coil 121 in the same layer and the straight line segment 1001 in the outermost wave-wound coil 121 connecting to the first stacked coil group 123 are located in two adjacent slot layers of two slots with a span of y, and are connected together by a welding segment 1003. When the straight line segment 1001 in the outermost wave-wound coil 121 connecting to the first stacked coil group 123 is located in the i-th slot, the straight line segment 1001 in the first stacked coil group 123 connecting to the outermost wave-wound coil 121 in the same layer is located in the iy-th slot. For example, when the straight line segment 1001 in the outermost same-layer wave-wound coil 121 connected to the first stacked coil group 123 is located at the N+y+1(L) or N+y+2(L) position of the iron core, the straight line segment 1001 in the first stacked coil group 123 connected to the outermost same-layer wave-wound coil 121 is located at the N+1(L-1) or N+2(L-1) position of the iron core, and the other straight line segments 1001 of the first stacked coil group 123 are located at the N+y+1(L-2), N+1(L-3), N+y+1(L-4) or N+y+2(L-2), N+2(L-3), N+y+2(L-4) positions of the iron core in sequence.

[0058] See also Figures 3 to 8As shown, in this embodiment, the span of the innermost same-layer wave-wound coil 122 of the first connecting segment is y-2 or y-1, that is, the span between the two straight segments 1001 in the innermost same-layer wave-wound coil 122 is y-2 or y-1, where y represents the motor pole pitch. The two straight segments 1001 of the innermost same-layer wave-wound coil 122 are connected by a connecting segment 1002, and the winding direction of the innermost same-layer wave-wound coil 122 is the same as the winding direction of the outermost same-layer wave-wound coil 121. When the span between the two straight segments 1001 is y-2, if the straight segment 1001 in the innermost same-layer wave-wound coil 122 connected to the first stacked coil group 123 is located in the i-th slot, then the other straight segment 1001 in the innermost same-layer wave-wound coil 122 is located in the i+y-2 slot or the i-y+2 slot. It should be noted that within the innermost wave-wound coil 122, two straight segments 1001 are located in the same slot layer within different slots. For example, if the straight segment 1001 connecting the innermost wave-wound coil 122 and the first stacked coil group 123 is located at position N (L) on the core 100, the other straight segment 1001 is located at position N+y-2 (L) or N-y+1 (L).

[0059] See also Figures 3 to 8 As shown, in this embodiment, the structure and winding method of the second stacked coil group 124 are the same as those of the first stacked coil group 123. It should be noted that the first and last full-pitch coils 1203 in the second stacked coil group 124 are connected in series with the innermost same-layer wave-wound coil 122 and the outermost same-layer wave-wound coil 121 in the second connecting section via welding sections 1003. For example, if the straight line segment 1001 of the innermost same-layer wave-wound coil 122 connecting to the second stacked coil group 124 is located at position N(L) of the iron core, and the straight line segment 1001 of the second stacked coil group 124 connecting to the innermost same-layer wave-wound coil 122 is located at position N+y(L+1) of the iron core, then the remaining straight line segments 1001 of the second stacked coil group 124 are sequentially located at positions N(L+2), N+y(L+3), and N(L+4) of the iron core.

[0060] See also Figures 3 to 8 、 Figure 15As shown, in this embodiment, each phase winding may include multiple parallel branches, for example, a first branch, a second branch, and a third branch, wherein the input terminals A1, A2, and A3 are connected, and the output terminals X1, X2, and X3 are connected, so that the first branch, the second branch, and the third branch are connected in parallel. It should be noted that for each phase winding, the input terminals of each branch differ by one slot 110 in the circumferential direction of the iron core 100. Since the motor is generally a multi-phase motor, the output terminals of each branch in the multi-phase winding are allowed to be connected to each other to form a star point line.

[0061] Therefore, by arranging the windings and branches on the iron core 100, each parallel branch is completely symmetrical on the magnetic circuit, so that each parallel branch has the same parameters such as resistance, inductance and potential, and there is no circulating current between the branches after parallel connection, thereby improving the efficiency of the motor and reducing the vibration and noise of the motor.

[0062] See also Figures 3 to 8 As shown, in this embodiment, one end of the two straight segments 1001 in the outermost same-layer wave-wound coil 121 and the innermost same-layer wave-wound coil 122 are connected together by a connecting segment 1002, and the other end is bent outward along the same direction relative to the straight segment 1001 to form a first twist segment 1004, and the bending directions of the first twist segments 1004 on the outermost same-layer wave-wound coil 121 and the innermost same-layer wave-wound coil 122 are opposite, one end of the two straight segments 1001 in the full-pitch coil 1203 is bent inward along the opposite direction relative to the straight segment 1001 to form a second twist segment 1005, and the extension lengths of the first twist segment 1004 and the second twist segment 1005 relative to the straight segment 1001 are both The two adjacent coils are welded together through the twist section to form the welding section 1003, and the span of the welding section 1003 is y.

[0063] See also Figures 9 to 15 As shown, in a specific embodiment, the motor includes phase A, phase B, phase C, 6 poles, 54 slots 110, 6 wires in each slot 110, and the number of slots per pole and per phase q=3.

[0064] See also Figures 9 to 15As shown, the B-phase winding and the C-phase winding are wound in the same manner as the A-phase winding. The only difference between the A-phase winding, the B-phase winding, and the C-phase winding is that the incoming and outgoing wire ends are located in different wire slots 110. For example, the incoming wire ends of the A-phase winding are slots 1, 2, and 3, respectively, while the incoming wire ends of the B-phase winding can be slots 7, 8, and 9, and the incoming wire ends of the C-phase winding can be slots 13, 14, and 15. However, this is not limited to this and can be determined according to actual needs.

[0065] See also Figures 9 to 15 As shown, using the A-phase winding as an example, A1X1 is the first parallel branch of the A-phase winding, A2X2 is the second parallel branch of the A-phase winding, and A3X3 is the third parallel branch of the A-phase winding. A1, A2, and A3 are the incoming terminals of the winding, and X1, X2, and X3 are the outgoing terminals of the winding. Specifically, the number of layers of the A-phase winding is L = 6, and the pole pitch of the A-phase winding is y = 9. Each branch includes three connecting segments: a first connecting segment 111, a second connecting segment 112, and a third connecting segment 113.

[0066] See also Figures 9 to 11 In one embodiment, in the wire slots 110 of the core 100, the motor starts from the coil layer closest to the inner circle of the core and, along the radial direction, the slot layers are the first wire layer, the second wire layer, the third wire layer, the lower fourth wire layer, the fifth wire layer and the sixth wire layer, wherein the first wire layer is the innermost slot layer and the outermost slot layer is the sixth wire layer. Figures 9 to 11 It is a winding expansion diagram, and in each slot of each winding expansion diagram, from left to right, there are the 1st line layer, the 2nd line layer, the 3rd line layer, the lower 4 line layers, the 5th line layer and the 6th line layer.

[0067] See also Figure 9 As shown, the inlet end of the first branch A1X1 of the A-phase winding is located at the wire slot position 1(6) of the iron core. The specific winding method of the first branch A1X1 of the A-phase winding may include:

[0068] A1->1(6)->11(6)->2(5)->11(4)->2(3)->11(2)->2(1)->12(1)->21(2)-> 12(3)->21(4)->12(5)->21(6)->28(6)->19(5)->28(4)->19(3)->28(2)-> 19(1)->29(1)->38(2)->29(3)->38(4)->29(5)->38(6)->48(6)->39(5)-> 48(4)->39(3)->48(2)->39(1)->46(1)->1(2)->46(3)->1(4)->46(5)->X1.

[0069] See also Figure 10 As shown, the inlet end of the second branch A2X2 of the A-phase winding is located at the wire slot position 2(6) of the iron core. The specific winding method of the second branch A2X2 of the A-phase winding may include:

[0070] A2->2(6)->12(6)->3(5)->12(4)->3(3)->12(2)->3(1)->10(1)->19(2)-> 10(3)->19(4)->10(5)->19(6)->29(6)->20(5)->29(4)->20(3)->29(2)-> 20(1)->30(1)->39(2)->30(3)->39(4)->30(5)->39(6)->46(6)->37(5)-> 46(4)->37(3)->46(2)->37(1)->47(1)->2(2)->47(3)->2(4)->47(5)->X2.

[0071] See also Figure 11 As shown, the inlet end of the third branch A3X3 of the A-phase winding is located at the wire slot position 3(6) of the iron core. The specific winding method of the third branch A3X3 of the A-phase winding may include:

[0072] A3->3(6)->10(6)->1(5)->10(4)->1(3)->10(2)->1(1)->11(1)->20(2)-> 11(3)->20(4)->11(5)->20(6)->30(6)->21(5)->30(4)->21(3)->30(2)-> 21(1)->28(1)->37(2)->28(3)->37(4)->28(5)->37(6)->47(6)->38(5)-> 47(4)->38(3)->47(2)->38(1)->48(1)->3(2)->48(3)->3(4)->48(5)->X3.

[0073] In the first parallel branch A1X1, the span of the outermost same-layer wave winding coil of the first connecting section is 10, connected to one stacked coil group, and the span of the outermost same-layer wave winding coil 121 is 7, connected between two stacked coil groups.

[0074] The span of the outermost same-layer wave-wound coil 121 of the second connecting section is 7, which is connected to one stacked coil group. The span of the outermost same-layer wave-wound coil 121 is 10, which is connected between two stacked coil groups.

[0075] like Figures 9 to 11As shown, the span of the outermost same-layer wave-wound coil 121 of the third connecting section is 10, which is connected to one stacked coil group, and the span of the outermost same-layer wave-wound coil 121 is 10, which is connected between two stacked coil groups.

[0076] like Figures 9 to 11 As shown in the figure, the connection relationship between the outermost layer and the innermost layer of the same layer of wave-wound coils is shown. As can be seen from the figure, in each parallel branch, the span combination of the outermost layer and the innermost layer of the same layer of wave-wound coils is 10, 10, 7.

[0077] The above embodiment includes two outermost wave-wound coils, whose spans are 10 and 7 respectively; two innermost wave-wound coils, whose spans are 10 and 7 respectively; and two stacked coils, whose spans are both 9.

[0078] See also Figures 12 to 14 As shown, in another embodiment, Figures 12 to 14 It is a winding expansion diagram, and in each slot of each winding expansion diagram, from left to right, there are the 1st line layer, the 2nd line layer, the 3rd line layer, the lower 4 line layers, the 5th line layer and the 6th line layer.

[0079] See also Figure 12 As shown, the inlet end of the first branch A1X1 of the A-phase winding is located at the wire slot position 1(6) of the iron core. The specific winding method of the first branch A1X1 of the A-phase winding may include:

[0080] A1->1(6)->12(6)->3(5)->12(4)->3(3)->12(2)->3(1)->11(1)->20(2)-> 11(3)->20(4)->11(5)->20(6)->28(6)->19(5)->28(4)->19(3)->28(2)-> 19(1)->30(1)->39(2)->30(3)->39(4)->30(5)->39(6)->47(6)->38(5)-> 47(4)->38(3)->47(2)->38(1)->46(1)->1(2)->46(3)->1(4)->46(5)->X1.

[0081] See also Figure 13 As shown, the inlet end of the second branch A2X2 of the A-phase winding is located at the wire slot position 2(6) of the iron core. The specific winding method of the second branch A2X2 of the A-phase winding may include:

[0082] A2->2(6)->10(6)->1(5)->10(4)->1(3)->10(2)->1(1)->12(1)->21(2)-> 12(3)->21(4)->12(5)->21(6)->29(6)->20(5)->29(4)->20(3)->29(2)-> 20(1)->28(1)->37(2)->28(3)->37(4)->28(5)->37(6)->48(6)->39(5)-> 48(4)->39(3)->48(2)->39(1)->47(1)->2(2)->47(3)->2(4)->47(5)->X2.

[0083] See also Figure 14 As shown, the inlet end of the third branch A3X3 of the A-phase winding is located at the wire slot position 3 (6) of the iron core. The specific winding method of the third branch A3X3 of the A-phase winding may include:

[0084] A3->3(6)->11(6)->2(5)->11(4)->2(3)->11(2)->2(1)->10(1)->19(2)-> 10(3)->19(4)->10(5)->19(6)->30(6)->21(5)->30(4)->21(3)->30(2)-> 21(1)->29(1)->38(2)->29(3)->38(4)->29(5)->38(6)->46(6)->37(5)-> 46(4)->37(3)->46(2)->37(1)->48(1)->3(2)->48(3)->3(4)->48(5)->X3.

[0085] In the first parallel branch A1X1, the span of the outermost wave winding coil of the same layer in the first connection section is 11, connected to one stacked coil group, and the span of the innermost wave winding coil of the same layer is 8, connected between two stacked coil groups.

[0086] The span of the outermost wave-wound coil of the same layer in the second connecting section is 8, which is connected to a stacked coil group, and the span of the innermost wave-wound coil of the same layer is 11, which is connected between two stacked coil groups.

[0087] The span of the outermost wave-wound coil 121 of the third connecting section is 8 and is connected to one stacked coil group. The span of the innermost wave-wound coil 121 of the same layer is 8 and is connected between two stacked coil groups.

[0088] See also Figures 12 to 14As shown in the figure, the connection relationship between the outermost layer and the innermost layer of the same layer of wave-wound coils is shown. As can be seen from the figure, in each parallel branch, the span combination of the outermost layer and the innermost layer of the same layer of wave-wound coils is 11, 8, 8.

[0089] The above embodiment includes two outermost wave-wound coils, whose spans are 11 and 8 respectively; two innermost wave-wound coils, whose spans are 11 and 8 respectively; and two stacked coils, whose spans are both 9.

[0090] Therefore, the hairpin coils required in the above embodiment have only six linear shapes, which reduces the number of molds, reduces the complexity of the process, and reduces the production cost.

[0091] With this wiring arrangement, each conductor in the core's slots belongs to a specific phase. Therefore, the insulating paper between the conductors in the slots can be eliminated, increasing the slot fill rate and improving the motor's efficiency.

[0092] The present invention provides a motor winding and stator assembly, wherein the number of winding lines is small, thereby reducing the number of molds, reducing the complexity of the process, and reducing the production cost.

[0093] The present invention proposes a motor winding and stator assembly, which reduces the voltage difference between conductors of different layers in the same slot through the reasonable arrangement of the above-mentioned stacked coils and the same-layer wave-wound coils, making it less likely to cause interlayer breakdown and better adapting to the requirements of high-voltage drive.

[0094] The present invention proposes a motor winding and stator assembly, in which each parallel branch is completely symmetrical on the magnetic circuit and its electrical parameters such as resistance and inductance are completely equal, eliminating the loop current problem caused by the asymmetric structure, reducing noise and improving efficiency.

[0095] The present invention proposes a motor winding and stator assembly, in which the flat wire conductors in each stator slot belong to parallel branches of the same phase, and the flat wire conductors are distributed in the same phase, thereby eliminating the phase-to-phase insulation between the flat wire conductors, increasing the copper fill rate of the winding, and further improving the efficiency of the motor.

[0096] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope involved in the present application is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the inventive concept, such as the technical solutions formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

[0097] Except for the technical features described in the specification, the remaining technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present invention, the remaining technical features will not be described here in detail.

Claims

1. A motor winding, characterized in that: include: A multi-phase winding, wherein each phase of the winding includes multiple parallel branches, each branch including three connecting sections connected in series along a first direction, each connecting section including an outermost same-layer wave-wound coil, a first stacked coil group, an innermost same-layer wave-wound coil, and a second stacked coil group connected in series, the first stacked coil group being located between the outermost same-layer wave-wound coil and the innermost same-layer wave-wound coil, and the second stacked coil group being located to one side of the first stacked coil group along the first direction; The first stacked coil group and the second stacked coil group each include a plurality of coils of equal spacing connected in series; The spans of the outermost wave-wound coils of the same layer in the three connecting sections are y+1, y-2, y+1 or y+2, y-1, y-1 respectively; The spans of the innermost wave-wound coils of the same layer in the three connecting sections are y-2, y+1, y+1 or y-1, y+2, y-1 respectively; The full-pitch coil includes two straight line segments. Multiple full-pitch coils are radially arranged back and forth between the sub-outer layer and the sub-inner layer of the iron core slots in two motor iron core slots with a span of y, and are connected in series end to end. The straight line segments in the multiple series-connected full-pitch coils are one layer apart in sequence, and y represents the pole pitch of the motor.

2. The motor winding according to claim 1, characterized in that The outermost same-layer wave-wound coil and the innermost same-layer wave-wound coil each include two straight segments, one end of the two straight segments are connected together by a connecting segment, and the other end is bent outward along the same direction relative to the straight segments to form a twist segment.

3. The motor winding according to claim 2, characterized in that: The bending directions of the twist sections on the outermost same-layer wave-wound coil and the innermost same-layer wave-wound coil are opposite.

4. The motor winding according to claim 1, characterized in that One end of the two straight segments in the full-pitch coil is bent inwardly in opposite directions relative to the straight segments to form a twist segment.

5. The motor winding according to claim 2 or 4, characterized in that: The extension length of the twist segment relative to the straight segment is span.

6. The motor winding according to claim 2 or 4, characterized in that: Two adjacent coils are welded together through the twist section to form a welding section, and the span of the welding section is y.

7. The motor winding according to claim 1, characterized in that Each branch circuit is provided with an inlet terminal and an outlet terminal, and the inlet terminal and the outlet terminal of each branch circuit are located in two adjacent slot layers on different wire slots on the motor core.

8. The motor winding according to claim 7, characterized in that: The incoming wire ends of the plurality of branches are spaced one wire slot apart from each other.

9. A stator assembly, characterized in that: include: The iron core is provided with a plurality of wire slots, wherein the wire slots are distributed along the circumference of the iron core; A multi-phase winding, wherein each phase of the winding includes multiple parallel branches, each branch including three connecting sections connected in series in a first direction, each connecting section including an outermost same-layer wave-wound coil, a first stacked coil group, an innermost same-layer wave-wound coil, and a second stacked coil group connected in series in a first direction, wherein the first stacked coil group is located between the outermost same-layer wave-wound coil and the innermost same-layer wave-wound coil, and the second stacked coil group is located to one side of the first stacked coil group in the first direction; The first stacked coil group and the second stacked coil group each include a plurality of coils of equal spacing connected in series; The spans of the outermost wave-wound coils of the same layer in the three connecting sections are y+1, y-2, y+1 or y+2, y-1, y-1 respectively; The spans of the innermost wave-wound coils of the same layer in the three connecting sections are y-2, y+1, y+1 or y-1, y+2, y-1 respectively; The full-pitch coil includes two straight line segments. Multiple full-pitch coils are radially arranged back and forth between the sub-outer layer and the sub-inner layer of the iron core slots in two motor iron core slots with a span of y, and are connected in series end to end. The straight line segments in the multiple series-connected full-pitch coils are one layer apart in sequence, and y represents the pole pitch of the motor.

10. The stator assembly according to claim 9, characterized in that A plurality of slot layers are arranged in the wire slots of the iron core, and the number of the slot layers is an even number greater than or equal to 6.

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