flat wire motor stator and flat wire motor

Abstract

This invention provides a flat wire motor stator and a flat wire motor. The flat wire motor stator includes: a stator core with multiple stator slots evenly distributed circumferentially; a stator winding with three phase windings, each phase winding having four parallel branches; each phase winding corresponding to an embedded slot, the embedded slot being part of the stator slot; each phase branch winding being embedded in all the embedded slots corresponding to each phase; the branch winding is composed of multiple coils connected in series, each coil of the same branch winding corresponding to a different traversing region, and there are overlapping regions between the multiple traversing regions corresponding to different branch windings. The spans of the coils within the overlapping regions are different and they are interlocked. In this invention, the branch winding spans all layers and all slots of a single phase, avoiding different potential differences between layers, slots, and poles, fully realizing circumferential and radial phase balance between multiple branches, ensuring branch balance even under rotor eccentricity conditions, and eliminating circulating current.

Description

Technical Field

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

[0002] With the increasing number of new energy vehicle models using flat wire motors and the significant increase in the production volume of different models, the production efficiency and cost of flat wire motors have become the core of their development. Currently, most domestically produced flat wire motor stators suffer from low automation, slow production cycle time, and high mold costs, mainly manifested in a large number of linear types, difficulties in connecting lead wires, and complex jumper wires.

[0003] In some stator designs, in order to reduce the stator winding profile, the branches are used to cooperate and balance each other, but the imbalance of the branches is ignored. When structural eccentricity occurs, if the motor rotor structure is eccentric or other factors cause different potentials between different poles, the branch balance cannot be achieved, resulting in circulating current. Summary of the Invention

[0004] The main objective of this invention is to provide a flat wire motor stator and a flat wire motor to solve the problems in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, a flat wire motor stator is provided, comprising: a stator core having a plurality of stator slots evenly distributed circumferentially; a stator winding having three-phase windings disposed in the stator slots, each phase winding having four parallel branches; each phase winding having a corresponding insertion slot, the insertion slot being part of the stator slot, and each phase branch winding being inserted into all the insertion slots corresponding to each phase; the branch winding being composed of a plurality of coils connected in series, each coil of the same branch winding corresponding to a different cross-winding region, and overlapping regions existing between the multiple cross-winding regions corresponding to different branch windings, wherein the spans of the coils located within the overlapping regions are different and are nested together.

[0006] Furthermore, the number of stator slots is 12M, the number of poles of the motor is 2M, and the stator slots have 2K embedded layers arranged from the inside to the outside, where M and K are both positive integers greater than or equal to 2; the coils are embedded between two adjacent embedded layers, and two adjacent coils are located in different embedded layers.

[0007] Furthermore, the coils on the branch winding are arranged at equal intervals in the circumferential direction, with a spacing of six stator slots.

[0008] Furthermore, each two coils in the embedded layers are connected in series to form one turn of the stator winding. The number of turns of the stator winding connected in series from the inside to the outside is K, and the side closest to the inner diameter of the stator core is the first turn of the stator winding. The stator winding with an even number of turns is formed by alternating series connection of coils with a span of five stator slots and coils with a span of seven stator slots. The stator winding with an odd number of turns is formed by alternating series connection of coils with a span of five stator slots and coils with a span of seven stator slots, and the coil located at the end of the odd-numbered turns is a coil with a span of six stator slots.

[0009] Furthermore, the winding direction of each coil is from the inner embedded layer to the outer embedded layer.

[0010] Furthermore, the phase leads and neutral point leads of the stator winding are both located in the welded section of the stator winding.

[0011] Furthermore, the phase leads and neutral point leads of the stator winding are located on the outermost or innermost ring of the stator winding.

[0012] Furthermore, the coil includes: two insertion sections arranged in parallel, forming a cross-winding space between the two insertion sections; a twisted section connected between the two insertion sections; and a soldering section connected to one end of the insertion section away from the twisted section, the soldering section tilting outward toward the side away from the cross-winding space.

[0013] Furthermore, the welding section is bent and shaped onto the insertion section.

[0014] According to another aspect of the present invention, a flat wire motor is provided, having a flat wire motor stator according to any of the above-described embodiments.

[0015] Applying the technical solution of this invention, each phase's branch winding is embedded in all its corresponding slots, meaning the branch winding spans all layers and slots of a single phase. This avoids different potential differences between layers, slots, and poles, fully achieving circumferential and radial phase balance among multiple branches. Even under rotor eccentricity conditions, branch balance is still guaranteed, with no circulating current. Furthermore, the coils within the overlapping area have different spans and are interlocked, with larger span coils interlocked outside smaller span coils. There is no interference between coils within the overlapping area, resulting in regular and neat stator winding twist ends, eliminating irregular wire shapes such as jumpers and reverse crossovers. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 A schematic diagram of the structure of a flat wire motor stator is shown;

[0018] Figure 2 A schematic diagram of the layered structure of the stator slot is shown;

[0019] Figure 3 A schematic diagram of the distribution structure of the stator winding leads is shown;

[0020] Figure 4 A schematic diagram of the coil structure is shown;

[0021] Figure 5 A schematic diagram showing the nesting relationship between the coils is shown;

[0022] Figure 6 A schematic diagram of the winding unfolding of the first branch winding of phase U is shown;

[0023] Figure 7 A schematic diagram of the winding unfolding of the second branch winding of phase U is shown;

[0024] Figure 8 A schematic diagram of the winding unfolding of the third branch winding of phase U is shown;

[0025] Figure 9 A schematic diagram of the winding unfolding of the fourth branch winding of phase U is shown.

[0026] The above figures include the following reference numerals:

[0027] 1. Stator core; 2. Stator winding; 3. Coil; 4. Insertion section; 5. Twisted section; 6. Welded section. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0032] Combination Figures 1 to 9 As shown, according to a specific embodiment of this application, a flat wire motor stator is provided.

[0033] Specifically, the stator of the flat wire motor includes a stator core 1 and a stator winding 2. The stator core 1 has multiple stator slots evenly distributed circumferentially. The stator winding 2 has three-phase windings distributed in the stator slots, each phase winding having four parallel branches. Each phase winding corresponds to an embedded slot, which is part of the stator slot. Each phase branch winding is embedded in all the embedded slots corresponding to that phase. The branch winding is composed of multiple coils 3 connected in series. Each coil 3 of the same branch winding corresponds to a different bridging region. There are overlapping regions between the multiple bridging regions corresponding to different branch windings. The coils 3 located within the overlapping regions have different spans and are interlocked.

[0034] In this embodiment, each phase branch winding is embedded in all its corresponding slots, meaning the branch winding spans all layers and slots of a single phase. This avoids potential differences between layers, slots, and poles, fully achieving circumferential and radial phase balance among multiple branches. Even under rotor eccentricity, branch balance is maintained, and there is no circulating current. Furthermore, the coils 3 within the overlapping area have different spans and are interlocked, with larger span coils 3 interlocked outside smaller span coils 3. There is no interference between coils 3 within the overlapping area, resulting in regular and neat twisted ends of the stator winding 2, without skipped wires, reverse cross-wires, or other irregular wire shapes.

[0035] like Figure 2 As shown, the stator slots have 12M slots, the motor has 2M poles, and the stator slots have 2K embedded layers arranged from the inside out, where M and K are both positive integers greater than or equal to 2. Coils 3 are embedded between two adjacent embedded layers, with adjacent inner and outer coils 3 located in different embedded layers. Taking an 8-layer flat wire motor stator as an example, the layers are sequentially L1 / L2 / L3 / L4 / L5 / L6 / L7 / L8 from the inside out, with L1 and L2 being the first turn, L3 and L4 the second turn, and so on.

[0036] Based on the number of stator poles and the number of slots corresponding to each pole, the winding position of coil 3 is limited to ensure a uniform span on the welding side of coil 3, avoiding frequent adjustments to the welding interval during the welding process. Since each stator pole corresponds to six slots, the circumferential spacing of coil 3 is set to six stator slots based on the number of slots per pole. That is, coils 3 on the branch windings are equally spaced circumferentially, with each spacing being six stator slots.

[0037] Specifically, every two coils 3 embedded in each layer are connected in series to form one turn of the stator winding 2. The number of turns of the stator winding 2 connected in series from the inside out is K, with the first turn of the stator winding 2 being the side closest to the inner diameter of the stator core 1. The stator winding 2 with an even number of turns is formed by alternating series connection of coils 3 with a span of five stator slots and coils 3 with a span of seven stator slots. The stator winding 2 with an odd number of turns is formed by alternating series connection of coils 3 with a span of five stator slots and coils 3 with a span of seven stator slots, with the coil 3 at the end of the odd-numbered turns having a span of six stator slots. This arrangement ensures that the coils 3 with larger spans are placed outside the coils 3 with smaller spans, and there is no interference between the coils 3 in the overlapping area, making the twisted ends of the stator winding 2 regular and neat, without any skipped wires, reverse cross wires, or other irregular wire shapes.

[0038] To avoid reducing the production cycle due to adjusting the twisted wires of the welding section 6, the winding direction of each coil 3 is from the inner embedded layer to the outer embedded layer, so that the twisted wire direction of the welding section 6 of the coil 3 is consistent.

[0039] like Figure 3As shown, in order to keep the stator in a regular and uniform shape and to facilitate the alignment and welding of the leads, the phase leads and neutral point leads of the stator winding 2 are all set in the welding section 6 of the stator winding 2.

[0040] like Figure 3 As shown, in order to facilitate the connection of the three-phase leads and the neutral point and simplify the busbar design, the phase leads and the neutral point lead of stator winding 2 are both set on the outermost or innermost ring of stator winding 2.

[0041] like Figure 4 As shown, coil 3 includes an insertion section 4, a twisted section 5, and a welding section 6. There are two insertion sections 4 arranged in parallel, forming a bridging space between them. The twisted section 5 connects the two insertion sections 4, and the welding section 6 connects to the end of the insertion section 4 facing away from the twisted section 5, with the welding section 6 tilting outwards towards the side facing away from the bridging space.

[0042] Furthermore, to make the welding segment 6 more regular and avoid bending deformation, after the insertion segment 4 is embedded into the stator slot, the insertion segment 4 extending out of the stator slot is bent. That is, the welding segment 6 is bent and shaped on the insertion segment 4.

[0043] This embodiment uses an 8-pole, 48-slot, 8-layer flat wire motor stator as an example for detailed description. The stator winding 2 includes four parallel branches, each evenly distributed in layers 1 to 8 of the stator (with the stator slot closest to the inner diameter being the first layer), ensuring the electromagnetic symmetry of each branch winding. For example... Figures 6 to 9 As shown, taking the U-phase winding as an example, the winding method is described in detail:

[0044] like Figure 6As shown, the first branch is designated as U1, with a total of sixteen windings. Among them, there are seven coils 3 with a span of five stator slots, seven coils 3 with a span of seven stator slots, and two coils 3 with a span of six stator slots. A total of ten different coil wire types are involved. All coils 3 are connected in a wave-wound manner. The ends of the coils 3 are welded sequentially to form the first branch, as follows: the first coil 3 of U1 is embedded into the stator slot from layer 1 of slot 7 and layer 2 of slot 14. The end of the welded section 6 in slot 7 is the lead wire of U1. The second coil 3 of U1 is embedded into the stator slot from the first layer of slot 20 and the second layer of slot 25. The third coil 3 of U1 is embedded into the stator slot from the first layer of slot 31 and the second layer of slot 38. The fourth coil 3 of U1 is embedded into the stator slot from the first layer of slot 44 and the second layer of slot 2. The fifth coil 3 of U1 is embedded into the stator slot from the third layer of slot 8 and the fourth layer of slot 13. The sixth coil 3 of U1 is embedded into the stator slot from the third layer of slot 19 and the fourth layer of slot 26. The seventh coil 3 of U1 is embedded into the stator slot from the third layer of slot 32 and the fourth layer of slot 37. The eighth coil 3 of U1 is embedded into the stator slot from the third layer of slot 43 and the fourth layer of slot 2. The ninth coil 3 of U1 is embedded into the stator slot from the fifth layer of slot 8 and the sixth layer of slot 13. In the sub-slots, the tenth coil 3 of U1 is embedded into the stator slot from the 5th layer of slot 19 and the 6th layer of slot 26; the eleventh coil 3 of U1 is embedded into the stator slot from the 5th layer of slot 32 and the 6th layer of slot 37; the twelfth coil 3 of U1 is embedded into the stator slot from the 5th layer of slot 43 and the 6th layer of slot 1; the thirteenth coil 3 of U1 is embedded into the stator slot from the 7th layer of slot 7 and the 8th layer of slot 14; the fourteenth coil 3 of U1 is embedded into the stator slot from the 7th layer of slot 20 and the 8th layer of slot 25; the fifteenth coil 3 of U1 is embedded into the stator slot from the 7th layer of slot 31 and the 8th layer of slot 38; and the sixteenth coil 3 of U1 is embedded into the stator slot from the 7th layer of slot 44 and the 8th layer of slot 1. The end of the welding section 6 in slot 1 is the neutral point lead-out line of U1.

[0045] like Figure 7As shown, the second branch is designated as U2, with a total of sixteen windings. Among them, there are seven coils 3 with a span of five stator slots, seven coils 3 with a span of seven stator slots, and two coils 3 with a span of six stator slots, involving a total of ten different coil wire types. All coils 3 are connected in a wave-wound manner, and the ends of the windings are welded sequentially to form the second branch. The sequence is as follows: the first coil 3 of U2 is embedded into the stator slot from layer 1 of slot 8 and layer 2 of slot 13. The end of the welded section 6 in slot 8 is the U2 lead wire. The second coil 3 of U2 is embedded into the stator slot from the first layer of slot 19 and the second layer of slot 26. The third coil 3 of U2 is embedded into the stator slot from the first layer of slot 32 and the second layer of slot 37. The fourth coil 3 of U2 is embedded into the stator slot from the first layer of slot 43 and the second layer of slot 1. The fifth coil 3 of U2 is embedded into the stator slot from the third layer of slot 7 and the fourth layer of slot 14. The sixth coil 3 of U2 is embedded into the stator slot from the third layer of slot 20 and the fourth layer of slot 25. The seventh coil 3 of U2 is embedded into the stator slot from the third layer of slot 31 and the fourth layer of slot 38. The eighth coil 3 of U2 is embedded into the stator slot from the third layer of slot 44 and the fourth layer of slot 1. The ninth coil 3 of U2 is embedded into the stator slot from the fifth layer of slot 7 and the sixth layer of slot 14. In this configuration, the tenth coil 3 of U2 is embedded into the stator slot from the 5th layer of slot 20 and the 6th layer of slot 25; the eleventh coil 3 of U2 is embedded into the stator slot from the 5th layer of slot 31 and the 6th layer of slot 38; the twelfth coil 3 of U2 is embedded into the stator slot from the 5th layer of slot 44 and the 6th layer of slot 2; the thirteenth coil 3 of U2 is embedded into the stator slot from the 7th layer of slot 8 and the 8th layer of slot 13; the fourteenth coil 3 of U2 is embedded into the stator slot from the 7th layer of slot 19 and the 8th layer of slot 26; the fifteenth coil 3 of U2 is embedded into the stator slot from the 7th layer of slot 32 and the 8th layer of slot 37; and the sixteenth coil 3 of U2 is embedded into the stator slot from the 7th layer of slot 43 and the 8th layer of slot 2. The end of the welding section 6 in slot 2 is the neutral point lead-out line of U2.

[0046] like Figure 8As shown, the third branch is designated as U3, with a total of sixteen windings. Among them, there are seven coils 3 with a span of five stator slots, seven coils 3 with a span of seven stator slots, and two coils 3 with a span of six stator slots, involving a total of ten different coil wire types. All coils 3 are connected in a wave-wound manner, and the ends of the windings are welded sequentially to form the third branch. The sequence is as follows: the first coil 3 of U3 is embedded into the stator slot from the 8th layer of slot 8 and the 7th layer of slot 1. The end of the welded section 6 in slot 8 is the U3 lead wire. The second coil 3 of U3 is embedded in the stator slot from layer 1 of slot 43 and layer 7 of slot 38; the third coil 3 of U3 is embedded in the stator slot from layer 8 of slot 32 and layer 7 of slot 25; the fourth coil 3 of U3 is embedded in the stator slot from layer 8 of slot 19 and layer 7 of slot 14; the fifth coil 3 of U3 is embedded in the stator slot from layer 6 of slot 8 and layer 5 of slot 2; the sixth coil 3 of U3 is embedded in the stator slot from layer 6 of slot 44 and layer 5 of slot 37; the seventh coil 3 of U3 is embedded in the stator slot from layer 6 of slot 31 and layer 5 of slot 26; the eighth coil 3 of U3 is embedded in the stator slot from layer 6 of slot 20 and layer 5 of slot 13; and the ninth coil 3 of U3 is embedded in the stator slot from layer 4 of slot 7 and layer 3 of slot 2. The tenth coil 3 of U3 is embedded in the stator slot from the fourth layer of slot 44 and the third layer of slot 37. The eleventh coil 3 of U3 is embedded in the stator slot from the fourth layer of slot 31 and the third layer of slot 26. The twelfth coil 3 of U3 is embedded in the stator slot from the fourth layer of slot 20 and the third layer of slot 13. The thirteenth coil 3 of U3 is embedded in the stator slot from the second layer of slot 7 and the first layer of slot 1. The fourteenth coil 3 of U3 is embedded in the stator slot from the second layer of slot 43 and the first layer of slot 38. The fifteenth coil 3 of U3 is embedded in the stator slot from the second layer of slot 32 and the first layer of slot 25. The sixteenth coil 3 of U3 is embedded in the stator slot from the second layer of slot 19 and the first layer of slot 14. The end of the welding section 6 in slot 14 is the neutral point lead of U3.

[0047] like Figure 8As shown, the fourth branch is designated as U4, with a total of sixteen windings. Among them, there are seven coils 3 with a span of five stator slots, seven coils 3 with a span of seven stator slots, and two coils 3 with a span of six stator slots, involving a total of ten different coil wire types. All coils 3 are connected in a wave-wound manner, and the ends of the windings are welded sequentially to form the fourth branch. The sequence is as follows: the first coil 3 of U4 is embedded into the stator slot from the 8th layer of slot 7 and the 7th layer of slot 2. The end of the welded section 6 in slot 7 is the U4 lead wire. The second coil 3 of U4 is embedded in the stator slot from layer 1 of slot 44 and layer 7 of slot 37; the third coil 3 of U4 is embedded in the stator slot from layer 8 of slot 31 and layer 7 of slot 26; the fourth coil 3 of U4 is embedded in the stator slot from layer 8 of slot 20 and layer 7 of slot 13; the fifth coil 3 of U4 is embedded in the stator slot from layer 6 of slot 7 and layer 5 of slot 1; the sixth coil 3 of U4 is embedded in the stator slot from layer 6 of slot 43 and layer 5 of slot 38; the seventh coil 3 of U4 is embedded in the stator slot from layer 6 of slot 32 and layer 5 of slot 25; the eighth coil 3 of U4 is embedded in the stator slot from layer 6 of slot 19 and layer 5 of slot 14; and the ninth coil 3 of U4 is embedded in the stator slot from layer 4 of slot 8 and layer 3 of slot 1. The tenth coil 3 of U4 is embedded into the stator slot from the fourth layer of slot 43 and the third layer of slot 38. The eleventh coil 3 of U4 is embedded into the stator slot from the fourth layer of slot 32 and the third layer of slot 25. The twelfth coil 3 of U4 is embedded into the stator slot from the fourth layer of slot 19 and the third layer of slot 14. The thirteenth coil 3 of U4 is embedded into the stator slot from the second layer of slot 8 and the first layer of slot 2. The fourteenth coil 3 of U4 is embedded into the stator slot from the second layer of slot 44 and the first layer of slot 37. The fifteenth coil 3 of U4 is embedded into the stator slot from the second layer of slot 31 and the first layer of slot 26. The sixteenth coil 3 of U4 is embedded into the stator slot from the second layer of slot 20 and the first layer of slot 13. The end of the welding section 6 in slot 13 is the neutral point lead of U3.

[0048] The V-phase winding is similar to the U-phase winding. The end of the welding section 6 of slot 11 is the V1 lead, the end of the welding section 6 of slot 5 is the V1 neutral point lead, the end of the welding section 6 of slot 12 is the V2 lead, the end of the welding section 6 of slot 6 is the V2 neutral point lead, the end of the welding section 6 of slot 12 is the V3 lead, the end of the welding section 6 of slot 18 is the V3 neutral point lead, the end of the welding section 6 of slot 11 is the V4 lead, and the end of the welding section 6 of slot 17 is the V4 neutral point lead.

[0049] Similar to the U-phase winding, the W-phase winding preferably has the following characteristics for the lead wires: the end of the welding section 6 of slot 9 is the W1 neutral point lead wire; the end of the welding section 6 of slot 3 is the W1 lead wire; the end of the welding section 6 of slot 10 is the W2 neutral point lead wire; the end of the welding section 6 of slot 4 is the W2 lead wire; the end of the welding section 6 of slot 10 is the W3 neutral point lead wire; the end of the welding section 6 of slot 16 is the W3 lead wire; the end of the welding section 6 of slot 9 is the W4 neutral point lead wire; and the end of the welding section 6 of slot 15 is the W4 lead wire.

[0050] U1, U2, U3, and U4 connected together form the U-phase lead; V1, V2, V3, and V4 connected together form the V-phase lead; W1, W2, W3, and W4 connected together form the W-phase lead; wherein, the neutral points are preferably connected in groups of four, depending on the distance. Figure 3 As shown, the specific layout of the lead-out lines is as follows: Lead-out lines numbered 7, 8, 22, and 23 are U-phase lead-out lines; lead-out lines numbered 11, 12, 18, and 19 are V-phase lead-out lines; lead-out lines numbered 14, 15, 26, and 27 are W-phase lead-out lines; the first neutral point is numbered 9, 25, and 29; the second neutral point is numbered 10, 24, and 28; the third neutral point is numbered 13, 16, and 21; and the fourth neutral point is numbered 14, 17, and 28. All lead-out lines are located at welding section 6. The concentrated distribution of the three-phase lead-out lines and neutral points facilitates connection, achieves a compact design, and easily enables fully automated production.

[0051] Combination Figures 5 to 9 As shown, the coil 3 of branch U1 with a span of five stator slots and the coil 3 of branch U2 with a span of seven stator slots form seven pairs of large-span small coil groups (3 groups). Similarly, the coil 3 of branch U1 with a span of seven stator slots and the coil 3 of branch U2 with a span of five stator slots also form seven pairs of large-span small coil groups (3 groups), for a total of fourteen pairs of large-span small coil groups (3 groups). Likewise, fourteen pairs of large-span small coil groups are formed between branches U3 and U4. The remaining windings with a span of six are concentrated in a cluster. The twisted segment 5 of stator winding 2 is regular and neat, without any irregular winding shapes such as reverse crossovers.

[0052] Combination Figures 6 to 9 As shown, the branch windings are connected sequentially with coil 3 spanning five stator slots and coil 3 spanning five stator slots, with one large and one small span winding configuration. The last winding at the end of the odd-numbered turns is coil 3 spanning six stator slots. Then, a layer change is performed to enter the next turn, until the winding is led out. This allows a single branch to span all layers and all slots of the U-phase, avoiding different potential differences between layers, slots, and poles, and fully achieving circumferential and radial phase balance among the four branches. Even under rotor eccentricity conditions, branch balance is still guaranteed, and there is no circulating current.

[0053] According to another aspect of the present invention, a flat wire motor is provided, including a flat wire motor stator, wherein the flat wire motor stator is the flat wire motor stator in the above embodiments.

[0054] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0055] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0056] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flat wire motor stator, characterized in that, include: Stator core (1), wherein multiple stator slots are evenly distributed in the circumferential direction of the stator core (1); The stator winding (2) has three-phase windings distributed in the stator slots. Each phase winding has four parallel branches. Each phase winding has a corresponding embedded slot, which is part of the stator slot. Each phase branch winding is embedded in all the embedded slots corresponding to each phase. The branch winding is composed of multiple coils (3) connected in series. Each coil (3) of the same branch winding corresponds to a different cross-winding area. There is an overlapping area between the multiple cross-winding areas corresponding to different branch windings. The span of each coil (3) located in the overlapping area is different and they are nested together. The number of stator slots is 12M, the number of poles of the motor is 2M, the stator slots have 2K embedded layers arranged from the inside to the outside, where M and K are both positive integers greater than or equal to 2; the coils (3) are all embedded between two adjacent embedded layers, and two adjacent coils (3) are located in different embedded layers; The coil (3) includes: The insertion segment (4) has two parallel segments, and a cross-winding space is formed between the two insertion segments (4); A twisted segment (5) is connected between the two inserted segments (4); The welding segment (6) is connected to one end of the insertion segment (4) away from the twisted segment (5), and the welding segment (6) is inclined outward toward the side away from the cross-winding space; The coils (3) in each pair of embedded layers are connected in series to form one turn of the stator winding (2). The number of turns of the stator winding (2) connected in series from the inside to the outside is K. The first turn of the stator winding (2) is on the side closest to the inner diameter of the stator core (1). The stator winding (2) with an even number of turns is formed by alternating series connection of coils (3) with a span of five stator slots and coils (3) with a span of seven stator slots. The stator winding (2) with an odd number of turns is formed by alternating series connection of coils (3) with a span of five stator slots and coils (3) with a span of seven stator slots. The coil (3) located at the end of the odd number of turns is a coil (3) with a span of six stator slots. The phase lead-out line and the neutral point lead-out line of the stator winding (2) are both located in the welding section (6) of the stator winding (2). The phase leads and neutral point leads of the stator winding (2) are located on the outermost or innermost ring of the stator winding (2).

2. The flat wire motor stator according to claim 1, characterized in that, The coils (3) on the branch winding are arranged at equal intervals in the circumferential direction, with a spacing of six stator slots.

3. The flat wire motor stator according to claim 1, characterized in that, The winding direction of each coil (3) is from the inner embedded layer to the outer embedded layer.

4. The flat wire motor stator according to claim 1, characterized in that, The welding section (6) is bent and shaped on the insertion section (4).

5. A flat wire motor, characterized in that, The stator of the flat wire motor has any one of claims 1-4.

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