A 72-slot 8-pole flat wire winding, a stator, a motor and a vehicle having the same

Abstract

The present invention discloses a 72-slot, 8-pole flat wire winding, a stator, a motor, and a vehicle thereof, wherein the flat wire winding includes a three-phase winding, each phase winding includes multiple groups of parallel winding branches, each group of winding branches includes four parallel branches; each branch includes a single coil and a coil with a span of y, wherein two branches also include a coil with a span of y-1, and the other two branches each include a coil with a span of y+1; or, wherein two branches each include coils with spans of y-2 and y+1, and the other two branches each include coils with spans of y-1 and y+2; the four branches all start with a single coil as the winding, wherein the winding directions of two adjacent branches are opposite. The present invention has the advantages of compact structure, balanced electric potential of each branch, and no circulating current. It adopts a winding arrangement method combining coils of different spans and different types, reduces line shape and eliminates special-shaped wires, reduces the difficulty of the manufacturing process, and eliminates a series of problems caused by the asymmetry of each branch.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to a 72-slot 8-pole flat wire winding, a stator, a motor and a vehicle having the same. Background Art

[0002] With the rapid development of new energy vehicle technology, the performance requirements for drive motors, the heart of electric vehicles, are becoming increasingly stringent. Currently, high speed, lightweight, and high efficiency have become the development trends of drive motors, placing higher demands on the motor's power density, high-efficiency zone, and heat dissipation capacity.

[0003] 72-slot, 8-pole flat wire windings can be divided into round and flat wire windings. Compared with round wire windings, flat wire windings can effectively increase the motor slot fill rate, reduce copper loss, and thus improve motor efficiency. They can also reduce the height of the motor winding ends, thereby reducing the motor volume and increasing power / torque density. However, flat wire windings are inherently susceptible to skin effect, which is particularly pronounced in high-speed motors. To reduce this skin effect, existing techniques have increased the number of conductors in the stator slots, such as by 4, 6, or 8 layers. This complicates the processing and increases costs.

[0004] Because the conductors of each parallel branch are located at different locations along the inner diameter of the stator slots, achieving symmetry is difficult, especially when the motor has an odd number of slots per pole and phase and an even number of branches. Asymmetrical branches can lead to significant differences in back EMF, resistance, and inductance, creating circulating currents that increase parasitic losses and power, while also causing localized overheating in the motor windings and reducing motor life. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a 72-slot 8-pole flat wire winding with a compact structure, simple manufacture, symmetrical branches, and neat arrangement, as well as a motor and a vehicle having the same.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The stator comprises a three-phase winding, each of the phase windings comprising a plurality of parallel winding branches, each winding branch comprising four parallel branches, each branch comprising a plurality of coils sequentially arranged on circumferential core slots of the stator core and connected in series with each other, and the coils between the four branches in each winding branch are arranged in adjacent core slots;

[0008] Each of the four branches includes a single coil and a coil with a span of y, two of the branches also include a coil with a span of y-1, and the other two branches each include a coil with a span of y+1;

[0009] Alternatively, two of the branches further include coils with spans of y-2 and y+1, and the other two branches each include coils with spans of y-1 and y+2;

[0010] The winding directions of the two adjacent branches among the four branches are opposite, and both start with a single coil; one of the branches is wound from the innermost layer of the slot bottom to the outermost layer of the slot opening, and then from the outermost layer of the slot opening to the innermost layer of the slot bottom, and is transposed at the innermost layer of the slot bottom through coils of different spans; the other adjacent branch is wound from the outermost layer of the slot opening to the innermost layer of the slot bottom, and then from the innermost layer of the slot bottom to the outermost layer of the slot opening, and is transposed at the outermost layer of the slot opening through coils of different spans; this cycle is repeated to achieve branch symmetry.

[0011] As a further improvement of the present invention, the winding method adopted by one of the two adjacent branches is: a single coil is arranged in the innermost layer of the slot bottom, and the coil with a span of y is wound from the second innermost layer of the slot bottom to the outermost layer of the slot opening in a preset sequence direction, and then wound from the outermost layer of the slot opening to the innermost layer of the slot bottom in the same sequence direction, and the coil with a span of y-1 is used to perform transposition in the innermost layer of the slot bottom, and this cycle is repeated to achieve branch symmetry.

[0012] As a further improvement of the present invention, the winding method adopted by the other branch of the two adjacent branches is: a single coil is arranged in the outermost layer of the slot, and the coil with a span of y is wound from the outermost layer of the slot to the second inner layer of the slot bottom in a preset sequence direction, and then wound from the innermost layer of the slot bottom to the outermost layer of the slot in the same sequence direction, and the coil with a span of y+1 is used to perform transposition in the outermost layer of the slot, and this cycle is repeated to achieve branch symmetry.

[0013] As a further improvement of the present invention, the winding method adopted by one of the two adjacent branches is: a single coil is arranged in the innermost layer of the slot bottom, and the coil with a span of y is wound from the second innermost layer of the slot bottom to the outermost layer of the slot opening in a preset sequence direction, and then wound from the outermost layer of the slot opening to the innermost layer of the slot bottom in the same sequence direction, and the coil with a span of y-2 or y+1 is transposed in the innermost layer of the slot bottom, and this cycle is repeated to achieve branch symmetry.

[0014] As a further improvement of the present invention, the winding method adopted by the other branch of the two adjacent branches is: a single coil is arranged in the outermost layer of the slot, and the coil with a span of y is wound from the outermost layer of the slot to the second inner layer of the slot bottom in a preset sequence direction, and then wound from the innermost layer of the slot bottom to the outermost layer of the slot in the same sequence direction, and the coil with a span of y-1 or y+2 is transposed in the outermost layer of the slot, and this cycle is repeated to achieve branch symmetry.

[0015] As a further improvement of the present invention, the coils with spans of y-2, y-1 and y+1 all include a first coil, the first coil including a first coil body and a first bending portion, the first coil body including two first support rods arranged parallel to each other and a first head connecting one end of the two first support rods, the other ends of the two first support rods are provided with a first bending portion to form a welding end, and the first bending portion is bent along one side of the width direction of the first coil body.

[0016] As a further improvement of the present invention, the coil with a span of y includes a second coil, the second coil includes a second coil body and a second bending portion, the second coil body includes two second support rods arranged parallel to each other and a second head connecting one end of the two second support rods, the other ends of the two second support rods are provided with a second bending portion to form a welding end, and the second bending portion is bent along one side of the width direction of the second coil body.

[0017] As a further improvement of the present invention, the coil with a span of y also includes a third coil, the third coil includes a third coil body and a third bending portion, the third coil body includes two third support rods arranged parallel to each other and a third head connecting one end of the two third support rods, the other ends of the two third support rods are provided with a third bending portion to form a welding end, and the third bending portion is bent along the width direction of the third coil body and away from the third coil body.

[0018] As a further improvement of the present invention, the coil with a span of y also includes a fourth coil, the fourth coil including a fourth coil body and a fourth bending portion, the fourth coil body including two fourth support rods arranged parallel to each other and a fourth head connecting one end of the two fourth support rods, the other ends of the two fourth support rods are provided with a fourth bending portion to form a welding end, the fourth bending portion is bent along one side of the width direction of the fourth coil body; the bending direction of the first bending portion is opposite to the bending direction of the fourth bending portion.

[0019] As a further improvement of the present invention, the coils with spans of y-1, y+1 and y+2 all include a fifth coil, the fifth coil including a fifth coil body and a fifth bending portion, the fifth coil body including two fifth support rods arranged parallel to each other and a fifth head connecting one end of the two fifth support rods, the other ends of the two fifth support rods are provided with a fifth bending portion to form a welding end, the fifth bending portion is bent along one side of the width direction of the fifth coil body; the bending direction of the second bending portion is opposite to the bending direction of the fifth bending portion.

[0020] As a further improvement of the present invention, the single coil is the sixth coil, the sixth coil includes a sixth coil body and a sixth bending portion, the sixth coil body includes a sixth support rod, and the sixth support rod is provided with a sixth head and a sixth bending portion at both ends, and the sixth bending portion forms a welding end.

[0021] As a further improvement of the present invention, the phase winding includes a group of winding branches, the first branch of the winding branches includes a single coil A0, coils a1-A2, a3-A4, a5-A6, a7-A8, a9-A10, and a11-A12, the second branch includes a single coil B0, coils b1-B2, b3-B4, b5-B6, b7-B8, b9-B10, and b11-B12, the third branch includes a single coil C0, coils c1-C2, c3-C4, c5-C6, c7-C8, c9-C10, and c11-C12, and the fourth branch includes a single coil D0, coils d1-D2, d3-D4, d5-D6, d7-D8, d9-D10, and d11-D12;

[0022] The single coil A0 and the single coil C0 are both located at the first layer along the slot opening of the iron core slot, and the single coil B0 and the single coil D0 are both located at the sixth layer along the slot opening of the iron core slot. The first branch and the third branch have the same winding direction, and the second branch and the fourth branch have the same winding direction.

[0023] The span of coils a1-A2 and b1-B2 is y. The upper side of coil a1-A2 is located at the second layer of the core slot, and the lower side is located at the third layer of the core slot. The upper side of coil b1-B2 is located at the fifth layer of the core slot, and the lower side is located at the fourth layer of the core slot.

[0024] The span of coils a3-A4 and b3-B4 is y. The upper side of coil a3-A4 is located at the 4th layer of the core slot, and the lower side is located at the 5th layer of the core slot. The upper side of coil b3-B4 is located at the 3rd layer of the core slot, and the lower side is located at the 2nd layer of the core slot.

[0025] The span of coils a5-A6 and b5-B6 is y; the upper and lower layers of coils a5-A6 are both located in the sixth layer of the core slot; the upper and lower layers of coils b5-B6 are both located in the first layer of the core slot;

[0026] The span of coils a7-A8 and b7-B8 is y. The upper side of coils a7-A8 is located at the fifth layer of the core slot, and the lower side is located at the fourth layer of the core slot. The upper side of coils b7-B8 is located at the second layer of the core slot, and the lower side is located at the third layer of the core slot.

[0027] The span of coils a9-A10 and b9-B10 is y. The upper side of coils a9-A10 is located at the third layer of the core slot, and the lower side is located at the second layer of the core slot. The upper side of coils b9-B10 is located at the fourth layer of the core slot, and the lower side is located at the fifth layer of the core slot.

[0028] The span of coils a11-A12 is y-1, and their upper and lower layers are both located in the first layer of the core slot; the span of coils b11-B12 is y+1, and their upper and lower layers are both located in the sixth layer of the core slot;

[0029] The winding of the third and fourth branches can be deduced in the same way;

[0030] The A0 coil is connected to the a1-A2 coil by twist welding, the a1-A2 coil is connected to the a3-A4 coil by twist welding, the a3-A4 coil is connected to the a5-A6 coil by twist welding, the a5-A6 coil is connected to the a7-A8 coil by twist welding, and so on; the coil connection order is from the 1st layer to the 6th layer, and then from the 6th layer to the 1st layer, and the coils of different spans are used for line switching on the 1st layer, and this cycle is repeated.

[0031] As a further improvement of the present invention, the phase winding includes a group of winding branches, the first branch of the winding branches includes a single coil A0, coils a1-A2, a3-A4, a5-A6, a7-A8, a9-A10, a11-A12, a13-A14, a15-A16, a17-A18, a19-A20, a21-A22, and a23-A24, and the second branch includes a single coil B0, coils b1-B2, b3-B4, b5-B6, b7-B8, b9-B10, b11-B12, b13-B14, b15-B16, b17-B18, b19-B20, b21-B22, b23-B24, the third branch includes a single coil C0, coils c1-C2, c3-C4, c5-C6, c7-C8, c9-C10, c11-C12, c13-C14, c15-C16, c17-C18, c19-C20, c21-C22, c23-C24, the fourth branch includes a single coil D0, coils d1-D2, d3-D4, d5-D6, d7-D8, d9-D10, d11-D12, d13-D14, d15-D16, d17-D18, d19-D20, d21-D22, d23-D24;

[0032] The single coil A0 and the single coil C0 are both located at the first layer along the slot opening of the iron core slot, and the single coil B0 and the single coil D0 are both located at the sixth layer along the slot opening of the iron core slot. The first branch and the third branch have the same winding direction, and the second branch and the fourth branch have the same winding direction.

[0033] The span of coils a1-A2, a13-A14, b1-B2, and b13-B14 is y. The upper edges of coils a1-A2 and a13-A14 are located on the second layer of the core slot, and the lower edges are located on the third layer of the core slot. The upper edges of coils b1-B2 and b13-B14 are located on the fifth layer of the core slot, and the lower edges are located on the fourth layer of the core slot.

[0034] The span of coils a3-A4, a15-A16, b3-B4, and b15-B16 is y. The upper edges of coils a3-A4 and a15-A16 are located on the fourth layer of the core slot, and the lower edges are located on the fifth layer of the core slot. The upper edges of coils b3-B4 and b15-B16 are located on the third layer of the core slot, and the lower edges are located on the second layer of the core slot.

[0035] The spans of coils a5-A6, a17-A18, b5-B6, and b17-B18 are all y; the upper and lower layers of coils a5-A6 and a17-A18 are both located in the sixth layer of the core slot; the upper and lower layers of coils b5-B6 and b17-B18 are both located in the first layer of the core slot;

[0036] The span of coils a7-A8, coils a19-A20, coils b7-B8, and coils b19-B20 is all y; the upper edges of coils a7-A8 and coils a19-A20 are both located at the 5th layer of the core slot, and the lower edges are both located at the 4th layer of the core slot; the upper edges of coils b7-B8 and coils b19-B20 are both located at the 2nd layer of the core slot, and the lower edges are both located at the 3rd layer of the core slot;

[0037] The span of coils a9-A10, coils a21-A22, coils b9-B10, and coils b21-B22 is y. The upper edges of coils a9-A10 and coils a21-A22 are located on the third layer of the core slot, and the lower edges are located on the second layer of the core slot. The upper edges of coils b9-B10 and coils b21-B22 are located on the fourth layer of the core slot, and the lower edges are located on the fifth layer of the core slot.

[0038] The span of coils a11-A12 is y+1, and their upper and lower layers are both located in the first layer of the core slot; the span of coils a23-A24 is y-2, and their upper and lower layers are both located in the first layer of the core slot; the span of coils b11-B12 is y-1, and their upper and lower layers are both located in the sixth layer of the core slot; the span of coils b23-B24 is y+2, and their upper and lower layers are both located in the sixth layer of the core slot;

[0039] The winding of the third and fourth branches can be deduced in the same way;

[0040] The A0 coil is connected to the a1-A2 coil by twist welding, the a1-A2 coil is connected to the a3-A4 coil by twist welding, the a3-A4 coil is connected to the a5-A6 coil by twist welding, the a5-A6 coil is connected to the a7-A8 coil by twist welding, and so on; the coil connection order is from the 1st layer to the 6th layer, and then from the 6th layer to the 1st layer, and the coils of different spans are used for line switching on the 1st layer, and this cycle is repeated.

[0041] As a further improvement of the present invention, the neutral points of the coils are connected via a copper busbar, the height of which does not exceed the height of the coil welding ends.

[0042] As a further improvement of the present invention, the parallel connection form between the two branches in each group of winding branches is a star connection or a delta connection.

[0043] As a general technical concept, the present invention also provides a stator, including a stator core and the above-mentioned 72-slot 8-pole flat wire winding, wherein the stator core is provided with multiple core slots in the circumferential direction, and the phase windings in the 72-slot 8-pole flat wire winding are arranged in the core slots.

[0044] As a general technical concept, the present invention also provides a motor including the above-mentioned stator.

[0045] As a general technical concept, the present invention also provides a vehicle including the above-mentioned motor.

[0046] Compared with the prior art, the advantages of the present invention are:

[0047] 1. The 72-slot 8-pole flat wire winding of the present invention, the stator, motor and vehicle having the same, adopt a winding arrangement method combining coils of different spans and different types in the four parallel branches of each winding branch, reducing the number of wire types and eliminating special-shaped wires, which is convenient for assembly and mass production; each of the four branches includes a single coil and a coil with a span of y, two of which also include a coil with a span of y-1, and the other two branches each include a coil with a span of y+1; or, two of which also include coils with spans of y-2 and y+1, and the other two branches each include coils with spans of y-1 and y+2; a total of 6 coils with different spans are provided, and adjacent branches are connected The winding directions of the four branches are opposite, and both start with a single coil. One of the adjacent branches is wound from the innermost layer of the slot bottom to the outermost layer of the slot opening, and then from the outermost layer of the slot opening to the innermost layer of the slot bottom. The coils of different spans are transposed in the innermost layer of the slot bottom. The other adjacent branch is wound in the opposite direction. By using coils of different spans for transposition, the phase difference between different branches is eliminated, ensuring that each branch is symmetrical in the slot and layer. That is, the four parallel branches are distributed in a ring-shaped symmetrical structure in the core slot, thereby achieving a uniform and symmetrical distribution of the windings of each phase, making the potential of each branch balanced, without circulating current, and canceling harmonics, greatly improving the performance of the motor. Furthermore, the windings of each layer in the same core slot are all in phase, that is, except for the coil used for transposition, the remaining coils of each phase winding are all winding coils of the same span, with a simple arrangement. The coil bodies of each coil do not overlap and are arranged neatly, which greatly reduces the complexity of the manufacturing process and facilitates mass production. The present invention not only solves a series of problems caused by the asymmetry of the branches, but also effectively reduces the problems of high difficulty in the flat wire winding process and high manufacturing cost caused by the increase in the number of phases of the motor, thereby effectively reducing the production cost of the vehicle.

[0048] 2. In the 72-slot 8-pole flat wire winding of the present invention, the stator, motor and vehicle having the same, the neutral point of each coil is welded through a single copper busbar, the height of which does not exceed the height of the coil welding end. This not only simplifies the structure, but also reduces the height of the winding end, saves end space, and effectively reduces the size of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 Schematic diagram of the structural principle of the first coil in the present invention.

[0050] Figure 2 Schematic diagram of the structural principle of the second coil in the present invention.

[0051] Figure 3 Schematic diagram of the structural principle of the third coil in the present invention.

[0052] Figure 4 Schematic diagram of the structural principle of the fourth coil in the present invention.

[0053] Figure 5 Schematic diagram of the structural principle of the fifth coil in the present invention.

[0054] Figure 6 Schematic diagram of the structural principle of the sixth coil in the present invention.

[0055] Figure 7 Schematic diagram of the structural principle of the stator in the present invention.

[0056] Figure 8 Schematic diagram of the phase arrangement of any phase winding in Example 1 of the present invention.

[0057] Figure 9 Schematic diagram of the phase arrangement of any phase winding in embodiment 2 of the present invention.

[0058] Legend: 1. First coil; 11. First coil body; 111. First support rod; 112. First head; 12. First bend; 2. Second coil; 21. Second coil body; 211. Second support rod; 212. Second head; 22. Second bend; 3. Third coil; 31. Third coil body; 311. Third support rod; 312. Third head; 32. Third bend; 4. Fourth coil; 41. Fourth coil body; 411. Fourth support rod; 412. Fourth head; 42. Fourth bend; 5. Fifth coil; 51. Fifth coil body; 511. Fifth support rod; 512. Fifth head; 52. Fifth bend; 6. Sixth coil; 61. Sixth coil body; 611. Sixth support rod; 612. Sixth head; 62. Sixth bend; 7. Stator core; 71. Core slot; 8. Copper busbar. DETAILED DESCRIPTION

[0059] The present invention will be further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the scope of protection of the present invention is not limited thereby.

[0060] Example 1

[0061] like Figures 1 to 8 As shown, the 72-slot 8-pole flat wire winding of the present invention includes a three-phase winding, each phase winding includes multiple groups of parallel winding branches, each group of winding branches includes four parallel branches, each branch includes multiple coils arranged in sequence on the circumferential core slots 71 of the stator core 7 and connected in series with each other, and the coils between the four branches in each group of winding branches are arranged in adjacent core slots 71;

[0062] Each of the four branches includes a single coil and a coil with a span of y, two of which also include a coil with a span of y-1, and the other two branches each include a coil with a span of y+1;

[0063] The winding directions of two adjacent branches among the four branches are opposite, and both start with a single coil; one of the branches is wound from the innermost layer of the slot bottom (the first layer from the slot bottom to the slot opening) to the outermost layer of the slot opening, and then from the outermost layer of the slot opening (the last layer from the slot bottom to the slot opening) to the innermost layer of the slot bottom, and transposed at the innermost layer of the slot bottom through coils of different spans; the other adjacent branch is wound from the outermost layer of the slot opening to the innermost layer of the slot bottom, and then from the innermost layer of the slot bottom to the outermost layer of the slot opening, and transposed at the outermost layer of the slot opening through coils of different spans; this cycle is repeated to achieve branch symmetry.

[0064] Furthermore, the winding method adopted by one of the two adjacent branches is: a single coil is set in the innermost layer of the slot bottom, and the coil with a span of y is wound from the second innermost layer of the slot bottom to the outermost layer of the slot opening in a preset sequence direction, and then wound from the outermost layer of the slot opening to the innermost layer of the slot bottom in the same sequence direction, and the coil with a span of y-1 is used to perform transposition in the innermost layer of the slot bottom, and this cycle is repeated to achieve branch symmetry.

[0065] The winding method used for the other branch in each winding branch is: a single coil is set at the outermost layer of the slot, and the coil with a span of y is wound from the outermost layer of the slot to the second innermost layer of the slot bottom in a preset sequence direction, and then wound from the innermost layer of the slot bottom to the outermost layer of the slot in the same sequence direction, and the coil with a span of y+1 is transposed at the outermost layer of the slot, and this cycle is repeated to achieve branch symmetry.

[0066] In this embodiment, the two adjacent branch coils in each group of winding branches are wound from the inside to the outside along relative directions. Except for the bottom and outermost layers that are transposed in the same layer, the coils in the remaining layers have the same span, and the upper and lower edges of the coils in the middle layers are respectively located in the core slots 71 of the adjacent layers. Then, coils with different spans are transposed in the bottom layer to eliminate the phase difference between different branches, ensuring that each branch is symmetrical in the slot and layer, that is, the two parallel branches are distributed in a ring-shaped symmetrical structure in the core slot, thereby achieving uniform and symmetrical distribution of the windings of each phase, so that the potential of each branch is balanced, there is no circulating current, and harmonics are offset, which greatly improves the performance of the motor.

[0067] like Figure 1 As shown, in this embodiment, the coil with a span of y-1 includes a first coil 1, the first coil 1 includes a first coil body 11 and a first bending portion 12, the first coil body 11 includes two first support rods 111 arranged parallel to each other and a first head 112 connecting one end of the two first support rods 111, the other ends of the two first support rods 111 are provided with a first bending portion 12 to form a welding end, and the first bending portion 12 is bent along one side of the width direction of the first coil body 11.

[0068] like Figure 2As shown, in this embodiment, the coil with a span of y includes a second coil 2, the second coil includes a second coil body 21 and a second bending portion 22, the second coil body 21 includes two second support rods 211 arranged parallel to each other and a second head 212 connecting one end of the two second support rods 211, the other end of the two second support rods 211 is provided with a second bending portion 22 to form a welding end, and the second bending portion 22 is bent along one side of the width direction of the second coil body 21.

[0069] like Figure 3 As shown, in this embodiment, the coil with a span of y also includes a third coil 3, the third coil 3 includes a third coil body 31 and a third bending portion 32, the third coil body 31 includes two third support rods 311 arranged parallel to each other and a third head 312 connecting one end of the two third support rods 311, the other end of the two third support rods 311 is provided with a third bending portion 32 to form a welding end, and the third bending portion 32 is bent along the width direction of the third coil body 31 and away from the third coil body 31.

[0070] like Figure 4 As shown, in this embodiment, the coil with a span of y further includes a fourth coil 4, which includes a fourth coil body 41 and a fourth bent portion 42. The fourth coil body 41 includes two fourth support rods 411 arranged parallel to each other and a fourth head 412 connecting one end of the two fourth support rods 411. The other ends of the two fourth support rods 411 are provided with a fourth bent portion 42 to form a welding end. The fourth bent portion 42 is bent along one side of the width direction of the fourth coil body 41; the bending direction of the second bent portion 22 is opposite to the bending direction of the fourth bent portion 42. By comparison Figure 2 and Figure 4 As can be seen, the overall configuration of the second coil 2 and the fourth coil 4 is similar, differing only in the direction of the bends. This simplifies the wire shape and reduces irregularities. The second coil 2 is located in the middle layer of the core slots, while the fourth coil 4 is located at the edge of the core slots. These two coils share the same configuration, simplifying coil manufacturing and improving the symmetry of the 72-slot, 8-pole flat wire winding.

[0071] like Figure 5 As shown, in this embodiment, the coil with a span of y+1 further includes a fifth coil 5, which includes a fifth coil body 51 and a fifth bent portion 52. The fifth coil body 51 includes two fifth support rods 511 arranged parallel to each other and a fifth head 512 connecting one end of the two fifth support rods 511. The other ends of the two fifth support rods 511 are provided with a fifth bent portion 52 to form a welding end. The fifth bent portion 52 is bent along one side of the width direction of the fifth coil body 51; the bending direction of the first bent portion 12 is opposite to the bending direction of the fifth bent portion 52. By comparison Figure 1 and Figure 5It can be seen that the overall configurations of the first coil 1 and the fifth coil 5 are similar, except that the bending directions are different, which is beneficial to simplifying the line shape and reducing irregular lines.

[0072] like Figure 6 As shown, in this embodiment, the single coil is the sixth coil 6, which includes a sixth coil body 61 and a sixth bending portion 62. The sixth coil body 61 includes a sixth support rod 611. The sixth support rod 611 has a sixth head 612 and a sixth bending portion 62 at both ends, and the sixth bending portion 62 forms a welding end.

[0073] In this embodiment, the heads of the first coil 1 through the fifth coil 5 are all V-shaped or arc-shaped. Coils with V-shaped heads are referred to as V-shaped coils, while coils with arc-shaped heads are referred to as U-shaped coils. In this embodiment, each coil can be a U-shaped coil or a V-shaped coil. Since all coils have the same shape, the need for odd-shaped coils and jumper coils is eliminated, facilitating assembly and mass production. Of course, in other embodiments, a combination of U-shaped and V-shaped coils may also be employed.

[0074] In this embodiment, the parallel connection between the two branches in each group of winding branches is a star connection or a delta connection.

[0075] In this embodiment, the neutral point of each coil (such as Figure 8 a35, b35, c35 and d35) are connected by a copper busbar 8, the height of the copper busbar 8 does not exceed the height of the coil welding end, which not only simplifies the structure but also reduces the height of the winding end, thereby reducing the volume of the motor.

[0076] Specifically, a motor with 72 slots and 8 poles, 4 gate-end outlets, 3 slots per pole and per phase, and increasing coil layers from the bottom of the slot to the slot mouth is taken as an example. In this embodiment, the phase winding includes a group of winding branches, wherein the first branch includes a single coil A0, coils a1-A2, a3-A4, a5-A6, a7-A8, a9-A10, a11-A12, a13-A14, a15-A16, a17-A18, a19-A20, a21-A22, a23-A24, ..., a33-A34, a35, and the second branch includes a single coil B0, coils b1-B2, b3-B4, b5-B6, b7-B8, b9-B10, b11-B12, b13-B14, b15-B16, b17-B18, b19-B20, b21-B22, b23-B24, b25-B26, ..., b33-B3 4. b35, the third branch includes a single coil C0, coils c1-C2, c3-C4, c5-C6, c7-C8, c9-C10, c11-C12, c13-C14, c15-C16, c17-C18, c19-C20, c21-C22, c23-C24, c25-C26, ..., c33-C34, c35, The fourth branch includes a single coil D0, coils d1-D2, d3-D4, d5-D6, d7-D8, d9-D10, d11-D12, d13-D14, d15-D16, d17-D18, d19-D20, d21-D22, d23-D24, d25-D26, ..., d33-D34, d35, and the winding arrangement is as follows Figure 8 shown.

[0077] The connection form of the coil in the first branch is Aa, and the connection form of the coil in the second branch is Bb; the connection form of the coil in the third branch is Cc, and the connection form of the coil in the fourth branch is Dd; except for the single coil, the 1st to 6th layers are all U-shaped coils.

[0078] The single coil A0 and the single coil C0 are both located at the first layer along the slot opening direction of the inner bottom of the iron core slot 71, and the single coil B0 and the single coil D0 are both located at the sixth layer along the slot opening direction of the inner bottom of the iron core slot 71; the coils A0, B0, C0 and D0 are all lead wires, shaped as Figure 6 As shown; the winding direction of the first branch and the third branch is the same, and the winding direction of the second branch and the fourth branch is the same;

[0079] The span of coil a1-A2 and coil b1-B2 is y; the upper side of coil a1-A2 is located at the second layer of the core slot 71, and the lower side is located at the third layer of the core slot 71; the upper side of coil b1-B2 is located at the fifth layer of the core slot 71, and the lower side is located at the fourth layer of the core slot 71.

[0080] The span of coil a3-A4 and coil b3-B4 is both y; the upper edge of coil a3-A4 is located at the 4th layer of the core slot 71, and the lower edge is located at the 5th layer of the core slot 71; the upper edge of coil b3-B4 is located at the 3rd layer of the core slot 71, and the lower edge is located at the 2nd layer of the core slot 71.

[0081] The span of coil a5-A6 and coil b5-B6 is y; the upper and lower layers of coil a5-A6 are both located in the 6th layer of the core slot 71; the upper and lower layers of coil b5-B6 are both located in the 1st layer of the core slot 71.

[0082] The span of coil a7-A8 and coil b7-B8 is y. The upper side of coil a7-A8 is located at the 5th layer of the core slot 71, and the lower side is located at the 4th layer of the core slot 71; the upper side of coil b7-B8 is located at the 2nd layer of the core slot 71, and the lower side is located at the 3rd layer of the core slot 71.

[0083] The span of coil a9-A10 and coil b9-B10 is y. The upper edge of coil a9-A10 is located at the 3rd layer of the core slot 71, and the lower edge is located at the 2nd layer of the core slot 71; the upper edge of coil b9-B10 is located at the 4th layer of the core slot 71, and the lower edge is located at the 5th layer of the core slot 71.

[0084] The span of coils a11-A12 is y-1, and their upper and lower layers are both located in the first layer of the core slot 71; the span of coils b11-B12 is y+1, and their upper and lower layers are both located in the sixth layer of the core slot 71.

[0085] The winding of the third and fourth branches is similar.

[0086] The A0 coil is connected to the a1-A2 coil by twist welding, the a1-A2 coil is connected to the a3-A4 coil by twist welding, the a3-A4 coil is connected to the a5-A6 coil by twist welding, the a5-A6 coil is connected to the a7-A8 coil by twist welding, and so on; the coil connection order is from the 1st layer to the 6th layer, and then from the 6th layer to the 1st layer, and the coils of different spans are used for line switching on the 1st layer, and this cycle is repeated.

[0087] Specifically, coils a1-A2, a13-A14 and a25-A26 are all U-shaped coils with a span of 9. The three coils are superimposed on each other to form a third coil 3 located in the second and third layers of the core slot 71, which is shaped like Figure 3 Similarly, coils b1-B2, b13-B14 and b25-B26 are all U-shaped coils with a span of 9. The three coils are superimposed on each other to form a third coil 3 located at the 5th and 4th layers of the core slot 71, and the shape is as follows: Figure 3 shown.

[0088] Coils a3-A4, a15-A16 and a27-A28 are all U-shaped coils with a span of 9. The three coils are superimposed on each other to form a stacked U-shaped coil located in the 4th and 5th layers of the core slot 71, and the shape is as follows: Figure 3 The third coil 3 is shown. Similarly, coils b3-B4, b15-B16 and b27-B28 are all U-shaped coils with a span of 9. The three coils are superimposed on each other to form a stacked U-shaped coil located on the third and second layers of the core slot 71, with a shape as shown. Figure 3 The third coil 3 is shown.

[0089] Coils a5-A6, a17-A18 and a29-A30 are all U-shaped coils with a span of 9. The three coils are superimposed on each other to form a stacked U-shaped coil located in the 6th layer of the core slot 71, which is shaped like Figure 4 The fourth coil 4 is shown. Similarly, coils b5-B6, b17-B18 and b29-B30 are all U-shaped coils with a span of 9. The three coils are superimposed on each other to form a stacked U-shaped coil located in the first layer of the core slot 71, with a shape as shown. Figure 2 The second coil 2 is shown.

[0090] Coils a11-A12 and a23-A24 are U-shaped coils with a span of 8. The two coils are superimposed on each other to form the first coil 1 located in the first layer of the core slot 71, which is shaped like Figure 1 Coils b11-B12, b23-B24 are U-shaped coils with a span of 10, and the two coils are superimposed on each other to form the fifth coil 5 located in the sixth layer of the core slot 71, which is shaped like Figure 5 As shown in the figure, coils a11-A12 and a23-A24 on the first layer, and coils b11-B12 and b23-B24 on the sixth layer, are all on the same layer with the same span, ensuring that the branches are wound in the same direction. It is understood that in addition to using coils on the same layer for line switching, other methods can also be used for line switching, such as bus-bar switching.

[0091] The A0 coil of the first branch is connected to the a1-A2 coil by twist welding, the a1-A2 coil is connected to the a3-A4 coil by twist welding, the a3-A4 coil is connected to the a5-A6 coil by twist welding, and the a5-A6 coil is connected to the a7-A8 coil by twist welding. The coil connection order is from the 1st layer to the 2nd layer, the 2nd layer to the 3rd layer, the 4th layer, the 5th layer, the 6th layer, and then the 6th layer. After completing the same layer on the 6th layer, return to the 5th layer, and so on. The same cycle continues for the third branch.

[0092] The B0 coil of the second branch is connected to the b1-B2 coil by twist welding, the b1-B2 coil is connected to the b3-B4 coil by twist welding, the b3-B4 coil is connected to the b5-B6 coil by twist welding, and the b5-B6 coil is connected to the b7-B8 coil by twist welding. The coil connection order is from the 6th layer to the 5th layer, the 5th layer to the 4th layer, the 3rd layer, the 2nd layer, the 1st layer, and then it goes through the same layer on the 1st layer and returns to the 2nd layer, and so on. And so on for the fourth branch.

[0093] In this embodiment, adjacent branches are transposed at the innermost layer of the slot bottom or the outermost layer of the slot opening of the core slot 71 using coils of different pitches. This eliminates phase differences between the branches and ensures complete symmetry within each branch. The motor has 12 neutral points connected by side-welded copper bars, resulting in a simple structure. It is understood that in other embodiments, the branch winding outlets can also be located in the inner circumference of the stator.

[0094] It can be understood that the winding method of the third branch coil Cc is the same as that of the first branch coil Aa. The first branch coil Aa is wound starting from the 1st slot of the 1st layer of the core slot 71, while the third branch coil Cc is wound starting from the 37th slot of the 1st layer of the core slot 71. The winding method of the coil Dd in the fourth branch is the same as that of the second branch coil bB. The second branch coil bB is wound starting from the 1st slot of the 6th layer of the core slot 71, while the fourth branch coil Dd is wound starting from the 37th slot of the 6th layer of the core slot 71.

[0095] like Figure 7 As shown, this embodiment further provides a stator, which includes a stator core 7 and the above-mentioned 72-slot 8-pole flat wire winding. The inner wall of the stator core 7 is circumferentially provided with 72 core slots 71. Part of the phase winding in the 72-slot 8-pole flat wire winding is wound inside the core slots 71, and part of the phase winding is located outside the core slots 71. Each core slot 71 has 6 layers of phase windings with the same phase, and the number of layers of the phase winding in each core slot 71 is the same. It can be understood that in actual applications, the number of winding layers in each stator slot includes but is not limited to 6 layers, and can also be 2 layers, 4 layers, 8 layers, etc. The winding method can refer to the above-mentioned 6-layer winding method.

[0096] This embodiment also provides a motor including the above-mentioned stator, which can be applied to vehicles such as electric vehicles / electric vehicles (EV), pure electric vehicles (PEV / BEV), hybrid electric vehicles (HEV), extended-range electric vehicles (REEV), plug-in hybrid electric vehicles (PHEV), and new energy vehicles (NEV).

[0097] This embodiment also provides a vehicle including the above-mentioned motor, which may be an electric vehicle / electric vehicle (EV), a pure electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), an extended-range electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), a new energy vehicle (New Energy Vehicle), etc.

[0098] In this embodiment, by adopting a winding arrangement method that combines six types of coils with the same span, the line type and the absence of special-shaped wires are reduced, the complexity of the manufacturing process is reduced, and production is facilitated. It can also eliminate a series of problems caused by the asymmetry of the branches, so that each branch can be symmetrical in the slot and layer. At the same time, the bus structure is simplified, the structure is compact, and the end space is saved.

[0099] Example 2

[0100] like Figures 1 to 7 、 Figure 9 As shown, the 72-slot 8-pole flat wire winding of the present invention includes a three-phase winding, each phase winding includes multiple groups of parallel winding branches, each group of winding branches includes four parallel branches, each branch includes multiple coils arranged in sequence on the circumferential core slots 71 of the stator core 7 and connected in series with each other, and the coils between the four branches in each group of winding branches are arranged in adjacent core slots 71;

[0101] Each of the four branches includes a single coil and a coil with a span of y, two of which also include coils with spans of y-2 and y+1, and the other two branches each include coils with spans of y-1 and y+2;

[0102] The winding directions of two adjacent branches among the four branches are opposite, and both start with a single coil; one of the branches is wound from the innermost layer of the slot bottom (the first layer from the slot bottom to the slot opening) to the outermost layer of the slot opening, and then from the outermost layer of the slot opening (the last layer from the slot bottom to the slot opening) to the innermost layer of the slot bottom, and transposed at the innermost layer of the slot bottom through coils of different spans; the other adjacent branch is wound from the outermost layer of the slot opening to the innermost layer of the slot bottom, and then from the innermost layer of the slot bottom to the outermost layer of the slot opening, and transposed at the outermost layer of the slot opening through coils of different spans; this cycle is repeated to achieve branch symmetry.

[0103] Furthermore, the winding method adopted by one of the two adjacent branches is: a single coil is set in the innermost layer of the slot bottom, and the coil with a span of y is wound from the second innermost layer of the slot bottom to the outermost layer of the slot opening in a preset sequence direction, and then wound from the outermost layer of the slot opening to the innermost layer of the slot bottom in the same sequence direction, and the coil with a span of y-2 or y+1 is transposed in the innermost layer of the slot bottom, and this cycle is repeated to achieve branch symmetry.

[0104] The winding method adopted by the other branch in each group of winding branches is: the winding method adopted by the other branch of the two adjacent branches is: a single coil is set in the outermost layer of the slot, and the coil with a span of y is wound from the outermost layer of the slot to the second innermost layer of the slot bottom in a preset sequence direction, and then wound from the innermost layer of the slot bottom to the outermost layer of the slot in the same sequence direction, and the coil with a span of y-1 or y+2 is transposed in the outermost layer of the slot, and this cycle is repeated to achieve branch symmetry.

[0105] In this embodiment, the two adjacent branch coils in each group of winding branches are wound from the inside to the outside along relative directions. Except for the bottom and outermost layers that are transposed in the same layer, the coils in the remaining layers have the same span, and the upper and lower edges of the coils in the middle layers are respectively located in the core slots 71 of the adjacent layers. Then, coils with different spans are transposed in the bottom or outermost layer to eliminate the phase difference between different branches, ensuring that each branch is symmetrical in the slot and layer, that is, the two parallel branches are distributed in a ring-shaped symmetrical structure in the core slot, thereby achieving uniform and symmetrical distribution of the windings of each phase, so that the potential of each branch is balanced, there is no circulating current, and harmonics are offset, which greatly improves the performance of the motor.

[0106] like Figure 1 As shown, in this embodiment, the coils with spans y-2 and y+1 both include a first coil 1, the first coil 1 includes a first coil body 11 and a first bent portion 12, the first coil body 11 includes two first support rods 111 arranged parallel to each other and a first head 112 connecting one end of the two first support rods 111, the other ends of the two first support rods 111 are provided with a first bent portion 12 to form a welding end, and the first bent portion 12 is bent along one side of the width direction of the first coil body 11.

[0107] like Figure 2 As shown, in this embodiment, the coil with a span of y includes a second coil 2, the second coil includes a second coil body 21 and a second bending portion 22, the second coil body 21 includes two second support rods 211 arranged parallel to each other and a second head 212 connecting one end of the two second support rods 211, the other end of the two second support rods 211 is provided with a second bending portion 22 to form a welding end, and the second bending portion 22 is bent along one side of the width direction of the second coil body 21.

[0108] like Figure 3 As shown, in this embodiment, the coil with a span of y also includes a third coil 3, the third coil 3 includes a third coil body 31 and a third bending portion 32, the third coil body 31 includes two third support rods 311 arranged parallel to each other and a third head 312 connecting one end of the two third support rods 311, the other end of the two third support rods 311 is provided with a third bending portion 32 to form a welding end, and the third bending portion 32 is bent along the width direction of the third coil body 31 and away from the third coil body 31.

[0109] like Figure 4 As shown, in this embodiment, the coil with a span of y further includes a fourth coil 4, which includes a fourth coil body 41 and a fourth bent portion 42. The fourth coil body 41 includes two fourth support rods 411 arranged parallel to each other and a fourth head 412 connecting one end of the two fourth support rods 411. The other ends of the two fourth support rods 411 are provided with a fourth bent portion 42 to form a welding end. The fourth bent portion 42 is bent along one side of the width direction of the fourth coil body 41; the bending direction of the second bent portion 22 is opposite to the bending direction of the fourth bent portion 42. By comparison Figure 2 and Figure 4 As can be seen, the overall configuration of the second coil 2 and the fourth coil 4 is similar, differing only in the direction of the bends. This simplifies the wire shape and reduces irregularities. The second coil 2 is located in the middle layer of the core slots, while the fourth coil 4 is located at the edge of the core slots. These two coils share the same configuration, simplifying coil manufacturing and improving the symmetry of the 72-slot, 8-pole flat wire winding.

[0110] like Figure 5 As shown, in this embodiment, the coils with spans of y-1 and y+2 further include a fifth coil 5, which includes a fifth coil body 51 and a fifth bent portion 52. The fifth coil body 51 includes two fifth support rods 511 arranged parallel to each other and a fifth head 512 connecting one end of the two fifth support rods 511. The other ends of the two fifth support rods 511 are provided with a fifth bent portion 52 to form a welding end. The fifth bent portion 52 is bent along one side of the width direction of the fifth coil body 51; the bending direction of the first bent portion 12 is opposite to the bending direction of the fifth bent portion 52. By comparison Figure 1 and Figure 5 It can be seen that the overall configurations of the first coil 1 and the fifth coil 5 are similar, except that the bending directions are different, which is beneficial to simplifying the line shape and reducing irregular lines.

[0111] like Figure 6 As shown, in this embodiment, the single coil is the sixth coil 6, which includes a sixth coil body 61 and a sixth bending portion 62. The sixth coil body 61 includes a sixth support rod 611. The sixth support rod 611 has a sixth head 612 and a sixth bending portion 62 at both ends, and the sixth bending portion 62 forms a welding end.

[0112] In this embodiment, the heads of the first coil 1 through the fifth coil 5 are all V-shaped or arc-shaped. Coils with V-shaped heads are referred to as V-shaped coils, while coils with arc-shaped heads are referred to as U-shaped coils. In this embodiment, each coil can be a U-shaped coil or a V-shaped coil. Since all coils have the same shape, the need for odd-shaped coils and jumper coils is eliminated, facilitating assembly and mass production. Of course, in other embodiments, a combination of U-shaped and V-shaped coils may also be employed.

[0113] In this embodiment, the parallel connection between the two branches in each group of winding branches is a star connection or a delta connection.

[0114] In this embodiment, the neutral point of each coil (such as Figure 9 a35, b35, c35 and d35) are connected by a copper busbar 8, the height of the copper busbar 8 does not exceed the height of the coil welding end, which not only simplifies the structure but also reduces the height of the winding end, thereby reducing the volume of the motor.

[0115] Specifically, a motor with 72 slots and 8 poles, 4 gate-end outlets, 3 slots per pole and per phase, and increasing coil layers from the slot bottom to the slot top is taken as an example. In this embodiment, the phase winding includes a group of winding branches, wherein the first branch includes a single coil A0, coils a1-A2, a3-A4, a5-A6, a7-A8, a9-A10, a11-A12, a13-A14, a15-A16, a17-A18, a19-A20, a21-A22, a23-A24, ..., a33-A34, a35, and the second branch includes a single coil B0, coils b1-B2, b3-B4, b5-B6, b7-B8, b9-B10, b11-B12, b13-B14, b15-B16, b17-B18, b19-B20, b21-B22, b23-B24, b25-B26, ..., b33-B3 4. b35, the third branch includes a single coil C0, coils c1-C2, c3-C4, c5-C6, c7-C8, c9-C10, c11-C12, c13-C14, c15-C16, c17-C18, c19-C20, c21-C22, c23-C24, c25-C26, ..., c33-C34, c35, The fourth branch includes a single coil D0, coils d1-D2, d3-D4, d5-D6, d7-D8, d9-D10, d11-D12, d13-D14, d15-D16, d17-D18, d19-D20, d21-D22, d23-D24, d25-D26, ..., d33-D34, d35, and the winding arrangement is as follows Figure 8 shown.

[0116] The connection form of the coil in the first branch is Aa, and the connection form of the coil in the second branch is Bb; the connection form of the coil in the third branch is Cc, and the connection form of the coil in the fourth branch is Dd; except for the single coil, the 1st to 6th layers are all U-shaped coils.

[0117] The single coil A0 and the single coil C0 are both located at the first layer along the slot opening direction of the inner bottom of the iron core slot 71, and the single coil B0 and the single coil D0 are both located at the sixth layer along the slot opening direction of the inner bottom of the iron core slot 71; the coils A0, B0, C0 and D0 are all lead wires, shaped as Figure 6 As shown, the winding direction of the first branch and the third branch is the same, and the winding direction of the second branch and the fourth branch is the same. Compared with Example 1, the starting winding position of the coil in Example 2 is postponed by one core slot.

[0118] The span of coil a1-A2, coil a13-A14, coil b1-B2, and coil b13-B14 is all y; the upper edges of coil a1-A2 and coil a13-A14 are both located on the second layer of the iron core slot 71, and the lower edges are both located on the third layer of the iron core slot 71; the upper edges of coil b1-B2 and coil b13-B14 are both located on the fifth layer of the iron core slot 71, and the lower edges are both located on the fourth layer of the iron core slot 71.

[0119] The span of coil a3-A4, coil a15-A16, coil b3-B4, and coil b15-B16 is all y; the upper edges of coil a3-A4 and coil a15-A16 are both located on the 4th layer of the core slot 71, and the lower edges are both located on the 5th layer of the core slot 71; the upper edges of coil b3-B4 and coil b15-B16 are both located on the 3rd layer of the core slot 71, and the lower edges are both located on the 2nd layer of the core slot 71.

[0120] The span of coil a5-A6, coil a17-A18, coil b5-B6, and coil b17-B18 are all y; the upper and lower layers of coil a5-A6 and coil a17-A18 are both located on the 6th layer of the core slot 71; the upper and lower layers of coil b5-B6 and coil b17-B18 are both located on the 1st layer of the core slot 71.

[0121] The span of coils a7-A8, a19-A20, b7-B8, and b19-B20 is all y; the upper edges of coils a7-A8 and a19-A20 are both located on the 5th layer of the core slot 71, and the lower edges are both located on the 4th layer of the core slot 71; the upper edges of coils b7-B8 and b19-B20 are both located on the 2nd layer of the core slot 71, and the lower edges are both located on the 3rd layer of the core slot 71.

[0122] The span of coil a9-A10, coil a21-A22, coil b9-B10, and coil b21-B22 is all y; the upper edges of coil a9-A10 and coil a21-A22 are both located on the 3rd layer of the core slot 71, and the lower edges are both located on the 2nd layer of the core slot 71; the upper edges of coil b9-B10 and coil b21-B22 are both located on the 4th layer of the core slot 71, and the lower edges are both located on the 5th layer of the core slot 71.

[0123] The span of coils a11-A12 is y+1, and their upper and lower layers are both located in the first layer of the core slot 71; the span of coils a23-A24 is y-2, and their upper and lower layers are both located in the first layer of the core slot 71; the span of coils b11-B12 is y-1, and their upper and lower layers are both located in the sixth layer of the core slot 71; the span of coils b23-B24 is y+2, and their upper and lower layers are both located in the sixth layer of the core slot 71.

[0124] The winding of the third and fourth branches is similar.

[0125] The A0 coil is connected to the a1-A2 coil by twist welding, the a1-A2 coil is connected to the a3-A4 coil by twist welding, the a3-A4 coil is connected to the a5-A6 coil by twist welding, the a5-A6 coil is connected to the a7-A8 coil by twist welding, and so on; the coil connection order is from the 1st layer to the 6th layer, and then from the 6th layer to the 1st layer, and the coils of different spans are used for line switching on the 1st layer, and this cycle is repeated.

[0126] Specifically, coils a1-A2, a13-A14 and a25-A26 are all U-shaped coils with a span of 9. The three coils are superimposed on each other to form a third coil 3 located in the second and third layers of the core slot 71, which is shaped like Figure 3 Similarly, coils b1-B2, b13-B14 and b25-B26 are all U-shaped coils with a span of 9. The three coils are superimposed on each other to form a third coil 3 located at the 5th and 4th layers of the core slot 71, and the shape is as follows: Figure 3 shown.

[0127] Coils a3-A4, a15-A16 and a27-A28 are all U-shaped coils with a span of 9. The three coils are superimposed on each other to form a stacked U-shaped coil located in the 4th and 5th layers of the core slot 71, and the shape is as follows: Figure 3 The third coil 3 is shown. Similarly, coils b3-B4, b15-B16 and b27-B28 are all U-shaped coils with a span of 9. The three coils are superimposed on each other to form a stacked U-shaped coil located on the third and second layers of the core slot 71, with a shape as shown. Figure 3 The third coil 3 is shown.

[0128] Coils a5-A6, a17-A18 and a29-A30 are all U-shaped coils with a span of 9. The three coils are superimposed on each other to form a stacked U-shaped coil located in the 6th layer of the core slot 71, which is shaped like Figure 4 The fourth coil 4 is shown. Similarly, coils b5-B6, b17-B18 and b29-B30 are all U-shaped coils with a span of 9. The three coils are superimposed on each other to form a stacked U-shaped coil located in the first layer of the core slot 71, with a shape as shown. Figure 2 The second coil 2 is shown.

[0129] Coils a11-A12 are U-shaped coils with a span of 10, and coils a23-A24 are U-shaped coils with a span of 7. The two coils are superimposed on each other to form the first coil 1 located in the first layer of the core slot 71, which is shaped like Figure 1 As shown; Coil b11-B12 is a U-shaped coil with a span of 8, and coil b23-B24 is a U-shaped coil with a span of 11. The two coils are superimposed on each other to form a fifth coil 5 located in the 6th layer of the core slot 71, which is shaped like Figure 5 As shown in the figure, coils a11-A12 and a23-A24 on the first layer, and coils b11-B12 and b23-B24 on the sixth layer are all on the same layer with different spans, ensuring that the branches are wound in the same direction. It is understood that in addition to using coils on the same layer for line switching, other methods can also be used for line switching, such as bus-bar switching.

[0130] In this embodiment, adjacent branches are transposed at the innermost layer of the slot bottom or the outermost layer of the slot opening of the core slot 71 using coils of different pitches. This eliminates phase differences between the branches and ensures complete symmetry within each branch. The motor has 12 neutral points connected by side-welded copper bars, resulting in a simple structure. It is understood that in other embodiments, the branch winding outlets can also be located in the inner circumference of the stator.

[0131] It can be understood that the winding method of the third branch coil Cc is the same as that of the first branch coil Aa. The first branch coil Aa is wound starting from the second slot of the first layer of the core slot 71, while the third branch coil Cc is wound starting from the 38th slot of the first layer of the core slot 71. The winding method of the coil Dd in the fourth branch is the same as that of the second branch coil bB. The second branch coil bB is wound starting from the second slot of the sixth layer of the core slot 71, while the fourth branch coil Dd is wound starting from the 38th slot of the sixth layer of the core slot 71.

[0132] like Figure 7As shown, this embodiment further provides a stator, which includes a stator core 7 and the above-mentioned 72-slot 8-pole flat wire winding. The inner wall of the stator core 7 is circumferentially provided with 72 core slots 71. Part of the phase winding in the 72-slot 8-pole flat wire winding is wound inside the core slots 71, and part of the phase winding is located outside the core slots 71. Each core slot 71 has 6 layers of phase windings with the same phase, and the number of layers of the phase winding in each core slot 71 is the same. It can be understood that in actual applications, the number of winding layers in each stator slot includes but is not limited to 6 layers, and can also be 2 layers, 4 layers, 8 layers, etc. The winding method can refer to the above-mentioned 6-layer winding method.

[0133] This embodiment also provides a motor including the above-mentioned stator, which can be applied to vehicles such as electric vehicles / electric vehicles (EV), pure electric vehicles (PEV / BEV), hybrid electric vehicles (HEV), extended-range electric vehicles (REEV), plug-in hybrid electric vehicles (PHEV), and new energy vehicles (NEV).

[0134] This embodiment also provides a vehicle including the above-mentioned motor, which may be an electric vehicle / electric vehicle (EV), a pure electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), an extended-range electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), a new energy vehicle (New Energy Vehicle), etc.

[0135] In this embodiment, by adopting a winding arrangement method that combines six types of coils with the same span, the line type and the absence of special-shaped wires are reduced, the complexity of the manufacturing process is reduced, and production is facilitated. It can also eliminate a series of problems caused by the asymmetry of the branches, so that each branch can be symmetrical in the slot and layer. At the same time, the bus structure is simplified, the structure is compact, and the end space is saved.

[0136] Although the present invention has been disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Any person skilled in the art can, without departing from the spirit and technical solutions of the present invention, make many possible changes and modifications to the technical solutions of the present invention through the methods and technical contents disclosed above, or modify them into equivalent embodiments with equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change, and modification of the above embodiments made in accordance with the technical spirit of the present invention, without departing from the content of the technical solutions of the present invention, shall still fall within the scope of protection of the technical solutions of the present invention.

Claims

1. A 72-slot 8-pole flat wire winding, characterized in that: The invention comprises a three-phase winding, each phase winding comprises a plurality of parallel winding branches, each winding branch comprises four parallel branches, each branch comprises a plurality of coils sequentially arranged on circumferential core slots (71) of a stator core (7) and connected in series with each other, and the coils between the four branches in each winding branch are arranged in adjacent core slots (71); Each of the four branches includes a single coil and a coil with a span of y, two of the branches also include coils with spans of y-2 and y+1, and the other two branches each include coils with spans of y-1 and y+2; The winding method used for one of the two adjacent branches is as follows: a single coil is arranged in the innermost layer of the slot bottom, and the coils with a span of y are wound in a preset sequence direction from the second innermost layer of the slot bottom to the outermost layer of the slot opening, and then in the same sequence direction from the outermost layer of the slot opening to the innermost layer of the slot bottom, and the coils with a span of y-2 or y+1 are transposed in the innermost layer of the slot bottom, and this cycle is repeated to achieve branch symmetry; The winding method adopted by the other branch of the two adjacent branches is: a single coil is set in the outermost layer of the slot, and the coil with a span of y is wound from the outermost layer of the slot to the second inner layer of the slot bottom in a preset sequence direction, and then wound from the innermost layer of the slot bottom to the outermost layer of the slot in the same sequence direction, and the coil with a span of y-1 or y+2 is transposed in the outermost layer of the slot, and this cycle is repeated to achieve branch symmetry.

2. The 72-slot 8-pole flat wire winding according to claim 1, characterized in that: The coils with spans of y-2, y-1 and y+1 all include a first coil (1), the first coil (1) including a first coil body (11) and a first bending portion (12), the first coil body (11) including two first support rods (111) arranged parallel to each other and a first head (112) connecting one end of the two first support rods (111), the other ends of the two first support rods (111) are provided with a first bending portion (12) to form a welding end, and the first bending portion (12) is bent along one side of the width direction of the first coil body (11).

3. The 72-slot 8-pole flat wire winding according to claim 2, characterized in that: The coil with a span of y comprises a second coil (2), the second coil (2) comprising a second coil body (21) and a second bending portion (22), the second coil body (21) comprising two second support rods (211) arranged parallel to each other and a second head (212) connecting one end of the two second support rods (211), the other ends of the two second support rods (211) are provided with a second bending portion (22) to form a welding end, and the second bending portion (22) is bent along one side of the width direction of the second coil body (21).

4. The 72-slot 8-pole flat wire winding according to claim 3, characterized in that: The coil with a span of y further comprises a third coil (3), the third coil (3) comprising a third coil body (31) and a third bending portion (32), the third coil body (31) comprising two third support rods (311) arranged parallel to each other and a third head (312) connecting one end of the two third support rods (311), the other ends of the two third support rods (311) being provided with a third bending portion (32) to form a welding end, the third bending portion (32) being bent along the width direction of the third coil body (31) and away from the third coil body (31).

5. The 72-slot 8-pole flat wire winding according to claim 4, characterized in that: The coil with a span of y further comprises a fourth coil (4), the fourth coil (4) comprising a fourth coil body (41) and a fourth bending portion (42), the fourth coil body (41) comprising two fourth support rods (411) arranged parallel to each other and a fourth head (412) connecting one end of the two fourth support rods (411), the other ends of the two fourth support rods (411) being provided with a fourth bending portion (42) to form a welding end, the fourth bending portion (42) being bent along one side of the width direction of the fourth coil body (41); the bending direction of the first bending portion (12) being opposite to the bending direction of the fourth bending portion (42).

6. The 72-slot 8-pole flat wire winding according to claim 5, characterized in that: The coils with spans of y-1, y+1 and y+2 all include a fifth coil (5), the fifth coil (5) including a fifth coil body (51) and a fifth bending portion (52), the fifth coil body (51) including two fifth support rods (511) arranged parallel to each other and a fifth head (512) connecting one end of the two fifth support rods (511), the other ends of the two fifth support rods (511) are provided with a fifth bending portion (52) to form a welding end, the fifth bending portion (52) is bent along one side of the width direction of the fifth coil body (51); the bending direction of the second bending portion (22) is opposite to the bending direction of the fifth bending portion (52).

7. The 72-slot 8-pole flat wire winding according to claim 6, characterized in that: The single coil is a sixth coil (6), and the sixth coil (6) comprises a sixth coil body (61) and a sixth bending portion (62). The sixth coil body (61) comprises a sixth support rod (611), and the sixth support rod (611) is provided with a sixth head (612) and a sixth bending portion (62) at both ends, respectively, and the sixth bending portion (62) forms a welding end.

8. The 72-slot 8-pole flat wire winding according to claim 1, characterized in that: The phase winding includes a group of winding branches, the first branch of the winding branches includes a single coil A0, coils a1-A2, a3-A4, a5-A6, a7-A8, a9-A10, a11-A12, a13-A14, a15-A16, a17-A18, a19-A20, a21-A22, a23-A24, and the second branch includes a single coil B0, coils b1-B2, b3-B4, b5-B6, b7-B8, b9-B10, b11-B12, b13-B14, b15-B16, b17-B18, b19-B20, b21-B2 2. b23-B24, the third branch includes a single coil C0, coils c1-C2, c3-C4, c5-C6, c7-C8, c9-C10, c11-C12, c13-C14, c15-C16, c17-C18, c19-C20, c21-C22, and c23-C24. The fourth branch includes a single coil D0, coils d1-D2, d3-D4, d5-D6, d7-D8, d9-D10, d11-D12, d13-D14, d15-D16, d17-D18, d19-D20, d21-D22, and d23-D24. The single coil A0 and the single coil C0 are both located at the first layer along the slot opening direction of the inner slot bottom of the iron core slot (71), and the single coil B0 and the single coil D0 are both located at the sixth layer along the slot opening direction of the inner slot bottom of the iron core slot (71); the winding direction of the first branch and the third branch is the same, and the winding direction of the second branch and the fourth branch is the same; The spans of coils a1-A2, a13-A14, b1-B2, and b13-B14 are all y; the upper edges of coils a1-A2 and a13-A14 are both located at the second layer of the core slot (71), and the lower edges are both located at the third layer of the core slot (71); the upper edges of coils b1-B2 and b13-B14 are both located at the fifth layer of the core slot (71), and the lower edges are both located at the fourth layer of the core slot (71); The spans of coils a3-A4, coils a15-A16, coils b3-B4, and coils b15-B16 are all y; the upper edges of coils a3-A4 and coils a15-A16 are both located at the 4th layer of the core slot (71), and the lower edges are both located at the 5th layer of the core slot (71); the upper edges of coils b3-B4 and coils b15-B16 are both located at the 3rd layer of the core slot (71), and the lower edges are both located at the 2nd layer of the core slot (71); The spans of coils a5-A6, coils a17-A18, coils b5-B6, and coils b17-B18 are all y; the upper and lower layers of coils a5-A6 and coils a17-A18 are both located at the sixth layer of the core slot (71); the upper and lower layers of coils b5-B6 and coils b17-B18 are both located at the first layer of the core slot (71); The spans of coils a7-A8, coils a19-A20, coils b7-B8, and coils b19-B20 are all y; the upper edges of coils a7-A8 and coils a19-A20 are both located at the fifth layer of the core slot (71), and the lower edges are both located at the fourth layer of the core slot (71); the upper edges of coils b7-B8 and coils b19-B20 are both located at the second layer of the core slot (71), and the lower edges are both located at the third layer of the core slot (71); The spans of coils a9-A10, coils a21-A22, coils b9-B10, and coils b21-B22 are all y; the upper edges of coils a9-A10 and coils a21-A22 are both located at the third layer of the core slot (71), and the lower edges are both located at the second layer of the core slot (71); the upper edges of coils b9-B10 and coils b21-B22 are both located at the fourth layer of the core slot (71), and the lower edges are both located at the fifth layer of the core slot (71); The spans of coils a11-A12 are all y+1, and the upper and lower layers thereof are both located at the first layer of the core slot (71); the spans of coils a23-A24 are all y-2, and the upper and lower layers thereof are both located at the first layer of the core slot (71); the spans of coils b11-B12 are all y-1, and the upper and lower layers thereof are both located at the sixth layer of the core slot (71); the spans of coils b23-B24 are all y+2, and the upper and lower layers thereof are both located at the sixth layer of the core slot (71); The winding of the third and fourth branches can be deduced in the same way; The A0 coil is connected to the a1-A2 coil by twist welding, the a1-A2 coil is connected to the a3-A4 coil by twist welding, the a3-A4 coil is connected to the a5-A6 coil by twist welding, the a5-A6 coil is connected to the a7-A8 coil by twist welding, and so on; the coil connection order is from the 1st layer to the 6th layer, and then from the 6th layer to the 1st layer, and the coils of different spans are used for line switching on the 1st layer, and this cycle is repeated.

9. The 72-slot 8-pole flat wire winding according to any one of claims 1 to 8, characterized in that: The neutral points of the coils are connected via a copper busbar (8), the height of which does not exceed the height of the coil welding ends.

10. The 72-slot 8-pole flat wire winding according to any one of claims 1 to 8, characterized in that: The parallel connection form between the two branches in each group of winding branches is a star connection or a delta connection.

11. A stator, characterized in that: The invention comprises a stator core (7) and a 72-slot 8-pole flat wire winding according to any one of claims 1 to 10, wherein the stator core (7) is provided with a plurality of core slots (71) in the circumferential direction, and the phase windings in the flat wire winding are arranged in the core slots (71).

12. A motor, characterized in that: Comprising the stator according to claim 11.

13. A vehicle, characterized in that: Comprising the motor as claimed in claim 12.

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