48-slot 8-pole flat wire winding stator, and hairpin electric motor

Abstract

Disclosed in the present invention are a 48-slot 8-pole hairpin winding stator, and a hairpin electric motor. The winding stator comprises three-phase windings, wherein each phase winding comprises a plurality of groups of winding branches that are connected in parallel. Each group of winding branches at least comprise two branches, and each branch comprises single coils and coils having a span of y. In each branch, the single coils are arranged at the innermost layer of a slot opening to serve as a winding start and a neutral point lead, lap-wound coils with a span of y are wound from the slot opening to the slot bottom, lap-wound coils with the span of y are subjected to in-layer transposition at the outermost layer of the slot bottom, the lap-wound coils with the span of y are then wound from the slot bottom to the slot opening, and lap-wound coils with a span of y-1 are subjected to in-layer transposition at the innermost layer of the slot opening; alternatively, concentric coils with the span of y are subjected to in-layer transposition at the outermost layer of the slot bottom, and then the lap-wound coils with the span of y are wound from the slot bottom to the slot opening. The present invention has the advantages of a compact structure, balanced electromotive force in all branches, no circulating currents, etc.; and eliminates a series of problems caused by the asymmetry of the branches.

Description

A 48-slot 8-pole flat wire winding stator and flat wire motor

[0001] Cross-reference to related applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 202410701007.X, filed on May 31, 2024, entitled “A 48-slot 8-pole flat wire winding stator and flat wire motor”, the full text of which is incorporated herein by reference as a part of this application. [Technical Field]

[0003] This invention belongs to the field of motor technology, specifically relating to a 48-slot 8-pole flat wire winding stator and a flat wire motor. [Background Technology]

[0004] With the rapid development of new energy vehicle technology, the performance requirements for drive motors, as one of the key actuators in electric vehicles, are becoming increasingly stringent. Currently, high speed, lightweight design, and high efficiency have become the development trends of drive motors, placing higher demands on their power density, high-efficiency range, and heat dissipation capabilities.

[0005] Stator windings can be divided into round wire and flat wire types. The difference between flat wire and round wire motors lies in the formation of the copper wire. Flat wire facilitates a higher slot fill factor. Generally, the slot fill factor of a round wire motor is around 50%, while that of a flat wire motor can reach over 70%. Increased slot fill factor means that more copper can be filled within the same space, reducing motor resistance and copper losses for the same current. Compared to round wire motors, flat wire motors have a larger contact area between the copper conductors within the slots, resulting in better heat dissipation.

[0006] When a motor operates at high speed, its AC copper losses increase significantly. To reduce copper losses, the number of conductor layers per stator slot is typically increased, such as 4, 6, or 8 layers. Since the conductors of each parallel branch are distributed in different positions within the stator slots, asymmetry between the branches can lead to significant differences in back EMF, resistance, and inductance, resulting in circulating currents, increased additional losses, and reduced efficiency. This also causes localized overheating of the motor windings, reducing the motor's lifespan.

[0007] The wiring method of the winding structure varies depending on the number of slots and pole pairs in the flat wire winding. For example, 48-slot, 8-pole windings are mostly designed with 2 or 4 branches, while 3-branch and 6-branch designs are less common or asymmetrical. Furthermore, due to the limitations of its winding design structure, it cannot flexibly switch between different parallel branches. Therefore, the existing design of flat wire stator windings is not flexible enough, has poor adaptability, and cannot design corresponding parallel branches as needed, thus having certain limitations.

[0008] [Summary of the Invention]

[0009] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a 48-slot 8-pole flat wire winding stator and flat wire motor with compact structure, simple manufacturing, symmetrical branches and neat arrangement.

[0010] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0011] A 48-slot 8-pole flat wire winding stator includes three-phase windings. Each phase winding includes multiple sets of parallel winding branches. Each winding branch includes at least two branches. Each branch includes multiple coils arranged sequentially and connected in series on the circumferential core slots of the stator core. Each branch includes a single coil and a coil with a span of y. The winding starts with the single coil located at the innermost layer of the slot opening. The single coil is used as the neutral point lead at the innermost layer of the slot opening. The lapped coil with a span of y is wound from the second innermost layer of the slot opening to the outermost layer at the bottom of the slot. Commutation is performed using any of the following methods during winding:

[0012] Method 1: The lapped coil with a span of y is commutated in the outermost layer at the bottom of the slot, and then the lapped coil with a span of y is wound from the second outermost layer at the bottom of the slot to the innermost layer at the top of the slot. The lapped coil with a span of y-1 is commutated in the innermost layer at the top of the slot.

[0013] Method 2: Use concentric coils with a span of y to perform same-layer commutation on the outermost layer at the bottom of the slot, and then use overlapping coils with a span of y to wind from the second outermost layer at the bottom of the slot to the innermost layer at the opening of the slot.

[0014] In some embodiments of the present invention, each winding branch includes three branches. In the same layer of iron core slots, the coils of the same branch are arranged in adjacent iron core slots, and the difference between two adjacent coils is the ratio of the total number of iron core slots to the total number of branches.

[0015] In some embodiments of the present invention, each set of winding branches includes two branches with the same winding method, and the two branches are alternately arranged in adjacent core slots.

[0016] In some embodiments of the present invention, the lapped coil with a span of y includes a first coil, which is wound from the innermost layer of the slot opening to the outermost layer of the slot bottom. The first coil includes a first coil body and a first bending portion. The first coil body includes two first support rods arranged parallel to each other and a first head connecting one end of the two first support rods. The other end of the two first support rods is provided with a first bending portion to form a welding end. The first bending portion bends along the width direction of the first coil body and away from the first coil body.

[0017] In some embodiments of the present invention, the lapped coil with a span of y further includes a second coil, the second coil being reversed in the outermost layer at the bottom of the slot, the second coil including a second coil body and a second bending portion, the second coil body including two parallel second support rods and a second head connecting one end of the two second support rods, the other end of the two second support rods being provided with a second bending portion to form a welding end, the second bending portion being bent along one side of the width direction of the second coil body.

[0018] In some embodiments of the present invention, the single coil includes a third coil, which is disposed in the innermost layer of the slot as a neutral point lead-out line. The third coil includes a third coil body and a third bend. The third coil body includes a third support rod, and the two ends of the third support rod are respectively provided with a third head and a third bend. The third bend forms a welding end. The bending direction of the third head is opposite to the bending direction of the third bend.

[0019] In some embodiments of the present invention, the concentric coil with a span of y includes a fourth coil, the fourth coil being reversed at the outermost layer of the bottom of the slot, the fourth coil including a fourth coil body and a fourth bend, the fourth coil body including two parallel fourth support rods and a fourth head connecting one end of the two fourth support rods, the other end of the two fourth support rods being provided with a fourth bend to form a welding end, the fourth bend bending along one side of the width direction of the fourth coil body.

[0020] In some embodiments of the present invention, the phase winding includes a set 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, a25-A26, a27-A28, a29-A30, and a single coil a31; the second branch of the winding branches 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, b27-B28, b29-B30, single coil b31; the third branch in the winding branch includes 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, c27-C28, c29-C30, single coil c31;

[0021] Single coils A0, B0, and C0 are all located in the first layer along the bottom of the slot in the iron core groove, serving as the starting point for winding; single coils a31, b31, and c31 are all located in the first layer along the bottom of the slot in the iron core groove, serving as the neutral point lead-out wire.

[0022] The spans of a1-A2 and a17-A18 are both y, with the upper edge located in the second layer of the iron core slot and the lower edge located in the first layer of the iron core slot.

[0023] The spans of a3-A4 and a19-A20 are both y, with the upper edge located in the second layer of the core slot and the lower edge located in the third layer of the core slot.

[0024] The spans of a5-A6 and a21-A22 are both y, with the upper edge located in the 4th layer of the iron core slot and the lower edge located in the 5th layer of the iron core slot.

[0025] The span of a7-A8 and a23-A24 is y, and their upper and lower edges are both located in the 6th layer of the iron core slot.

[0026] The spans of a9-A10 and a25-A26 are both y, with the upper edge located in the 5th layer of the core slot and the lower edge located in the 4th layer of the core slot.

[0027] The spans of a11-A12 and a27-A28 are both y, with the upper edge located in the 3rd layer of the iron core slot and the lower edge located in the 2nd layer of the iron core slot.

[0028] The spans of a13-A14 and a29-A30 are both y, with the upper edge located in the first layer of the iron core slot and the lower edge located in the second layer of the iron core slot.

[0029] The span of a15-A16 is y-1, and its upper and lower edges are both located in the first layer of the iron core slot.

[0030] The spans of b1-B2 and b17-B18 are both y, with the upper edge located in the second layer of the core slot and the lower edge located in the third layer of the core slot.

[0031] The spans of b3-B4 and b19-B20 are both y, with the upper edge located in the 4th layer of the core slot and the lower edge located in the 3rd layer of the core slot.

[0032] The span of b5-B6 and b21-B22 is y, and the upper edge is located in the 4th layer of the iron core slot, and the lower edge is located in the 5th layer of the iron core slot.

[0033] The span of b7-B8 and b23-B24 is y, and their upper and lower edges are both located in the 6th layer of the iron core slot.

[0034] The spans of b9-B10 and b25-B26 are both y, with the upper edge located in the 5th layer of the core slot and the lower edge located in the 4th layer of the core slot.

[0035] The span of b11-B12 and b27-B28 is y, with the upper edge located in the 3rd layer of the iron core slot and the lower edge located in the 4th layer of the iron core slot.

[0036] The span of b13-B14 and b29-B30 is y, with the upper edge located in the 3rd layer of the iron core slot and the lower edge located in the 2nd layer of the iron core slot.

[0037] The span of b15-B16 is y-1, and its upper and lower edges are both located in the first layer of the iron core slot.

[0038] The spans of c1-C2 and c17-C18 are both y, with the upper edge located in the second layer of the core slot and the lower edge located in the third layer of the core slot.

[0039] The span of c3-C4 and c19-C20 is y, with the upper edge located in the 4th layer of the iron core slot and the lower edge located in the 5th layer of the iron core slot.

[0040] The span of c5-C6 and c21-C22 is y, and its upper edge is located in the 6th layer of the iron core slot, and its lower edge is located in the 5th layer of the iron core slot.

[0041] The span of c7-C8 and c23-C24 is y, and their upper and lower edges are both located in the 6th layer of the iron core slot.

[0042] The span of c9-C10 and c25-C26 is y, with the upper edge located in the 5th layer of the iron core slot and the lower edge located in the 6th layer of the iron core slot.

[0043] The span of c11-C12 and c27-C28 is y, with the upper edge located in the 5th layer of the iron core slot and the lower edge located in the 4th layer of the iron core slot.

[0044] The span of c13-C14 and c29-C30 is y, with the upper edge located in the 3rd layer of the iron core slot and the lower edge located in the 2nd layer of the iron core slot.

[0045] The span between C15 and C16 is y-1, and both its upper and lower edges are located in the first layer of the core slot.

[0046] In the first branch of the winding, coil A0 is connected to coils a1-A2 by twist welding, coils a1-A2 are connected to coils a3-A4 by twist welding, coils a3-A4 are connected to coils a5-A6 by twist welding, coils a5-A6 are connected to coils a7-A8 by twist welding, and so on. The coil sequence is from layer 1 to layer 2, layer 2 to layer 3, layer 3 to layer 4, layer 4 to layer 5, and after completing the same layer in layer 6, it returns to layer 5, layer 4 to layer 3, then to layer 2, layer 1, and so on, to complete the winding of the branch. The second and third branches are similar to the first branch, and the windings are transposed by the outermost layer of the bottom slot and the innermost layer of the slot opening coils to achieve three-phase winding symmetry.

[0047] In some embodiments of the present invention, the phase winding includes a set of winding branches, and one 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, a25-A26, a27-A28, a29-A30, a31-A32, a33-A34, a35-A36, a37-A38, a39-A40, a41-A42, a43- A44, a45-A46, a47; another branch includes 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, b27-B28, b29-B30, b31-B32, b33-B34, b35-B36, b37-B38, b39-B40, b41-B42, b43-B44, b45-B46, b47;

[0048] The two branches have the same winding method. Single coil A0 and single coil B0 are both located in the first layer along the bottom of the slot in the iron core slot, serving as the starting point of winding; single coil a47 and single coil b47 are both located in the first layer along the bottom of the slot in the iron core slot, serving as the neutral point lead-out line.

[0049] The span of a1-A2, a3-A4, a5-A6, a40-A41, b1-B2, b3-B4, b5-B6 and b40-B41 is y. The upper edge is located in the second layer of the iron core slot and the lower edge is located in the first layer of the iron core slot.

[0050] The span of a7-A8 and b7-B8 is y. The upper edge is located in the second layer of the iron core slot, and the lower edge is located in the third layer of the iron core slot.

[0051] The spans of a9-A10, a11-A12, a13-A14, b9-B10, b11-B12, and b13-B14 are all y, with the upper edge located in the 4th layer of the core slot and the lower edge located in the 3rd layer of the core slot.

[0052] The spans of a15-A16 and b15-B16 are both y, with the upper edge located in the 4th layer of the core slot and the lower edge located in the 5th layer of the core slot.

[0053] The spans of a17-A18, a19-A20, a21-A22, b17-B18, b19-B20, and b21-B22 are all y, with the upper edge located in the 6th layer of the core slot and the lower edge located in the 5th layer of the core slot.

[0054] The span of a23-A24 and b23-B24 is y, and their upper and lower edges are both located in the 6th layer of the iron core slot.

[0055] The spans of a25-A26, a27-A28, a29-A30, b25-B26, b27-B28 and b29-B30 are all y, with the upper edge located in the 5th layer of the core slot and the lower edge located in the 6th layer of the core slot.

[0056] The span of a31-A32 and b31-B32 is y. The upper edge is located in the 5th layer of the iron core slot, and the lower edge is located in the 4th layer of the iron core slot.

[0057] The spans of a33-A34, a35-A36, a37-A38, b33-B34, b35-B36, and b37-B38 are all y, with the upper edge located in the 3rd layer of the core slot and the lower edge located in the 4th layer of the core slot.

[0058] The span of a39-A40 and b39-B40 is y. The upper edge is located in the 3rd layer of the iron core slot, and the lower edge is located in the 2nd layer of the iron core slot.

[0059] The spans of a41-A42, a43-A44, a45-A46, b41-B42, b43-B44, and b45-B46 are all y, with their upper edge located in the first layer of the iron core slot and their lower edge located in the second layer of the iron core slot.

[0060] In the first branch, coil A0 is connected to coils a1-A2 by twist welding, coils a1-A2 are connected to coils a3-A4 by twist welding, coils a3-A4 are connected to coils a5-A6 by twist welding, coils a5-A6 are connected to coils a7-A8 by twist welding, and so on. The coil connection sequence transitions from layers 1 and 2 to layers 3 and 4, then to layers 5 and 6, and finally, on layer 6, concentric coils are used to achieve same-layer bridging, and then the coils are sequentially connected to layer 1. This cycle is repeated to complete the winding of the first branch. The winding of the second branch is carried out in the same manner. The windings are transposed through the outermost layer at the bottom of the slot to achieve symmetry of the three-phase windings.

[0061] As a general technical concept, the present invention also provides a flat wire motor, including the above-mentioned 48-slot 8-pole flat wire winding stator.

[0062] Compared with the prior art, the advantages of the present invention are as follows:

[0063] 1. The 48-slot 8-pole flat wire winding stator of this invention employs a winding arrangement combining different spans and different types of coils in each winding branch. One type of wire replaces several coils in a certain layer of the phase winding, while other wire types remain unchanged and the welding ends are consistent. This allows for different branch connection schemes and flexible conversion of the number of parallel branches as needed. Through the connection scheme and busbar connection, different branch schemes such as 1, 2, 3, and 6 of the 48-slot stator can be achieved, achieving maximum compatibility of different branch schemes with minimal modifications. Simultaneously, it reduces the number of wire types, lowers the complexity of the manufacturing process, facilitates production, and eliminates a series of problems caused by asymmetry in each branch. It ensures that each branch is symmetrical in both the slot and layer, that is, each parallel branch is distributed in a ring-shaped symmetrical structure within the iron core slot, thereby achieving a uniform and symmetrical distribution of each phase winding. This results in balanced potential in each branch, no circulating current, and harmonic cancellation, greatly improving the performance of the motor. This invention not only solves a series of problems caused by the asymmetry of each branch, but also effectively reduces the difficulty and high manufacturing cost of flat wire winding process caused by the increase in the number of phases of the motor, thus effectively reducing the production cost of the vehicle.

[0064] 2. The winding stator and flat wire motor of the present invention achieves winding compatibility with different branch schemes without changing the welding end, and can flexibly switch between different numbers of parallel branches as needed, while reducing manufacturing difficulty; by using coils with different spans to form a reordering winding, the branches are completely symmetrical, avoiding the generation of circulating current and reducing the temperature rise of the motor; the flat wire conductors in the same iron core slot in the winding stator are of the same phase, and no phase-to-phase insulation is required between the conductors in the slot, which reduces manufacturing difficulty and motor insulation cost. [Attached Image Description]

[0065] Figure 1 is a schematic diagram of the structural principle of the first coil in a specific embodiment of the present invention.

[0066] Figure 2 is a schematic diagram of the structural principle of the second coil in a specific embodiment of the present invention.

[0067] Figure 3 is a schematic diagram of the structural principle of the third coil in a specific embodiment of the present invention.

[0068] Figure 4 is a schematic diagram of the structural principle of the fourth coil in a specific embodiment of the present invention.

[0069] Figure 5 is a schematic diagram of the structural principle of the stator gate end in specific embodiment 1 of the present invention.

[0070] Figure 6 is a schematic diagram of the structure and principle of the stator welding end in specific embodiment 1 of the present invention.

[0071] Figure 7 is a schematic diagram of the phase arrangement of any one phase winding in specific embodiment 1 of the present invention.

[0072] Figure 8 is a schematic diagram of the star connection of the three-phase windings in specific embodiment 1 of the present invention.

[0073] Figure 9 is a schematic diagram of the triangular connection of the three-phase windings in specific embodiment 1 of the present invention.

[0074] Figure 10 is a schematic diagram of the structural principle of the stator gate end in specific embodiment 2 of the present invention.

[0075] Figure 11 is a schematic diagram of the structure and principle of the stator welding end in specific embodiment 2 of the present invention.

[0076] Figure 12 is a schematic diagram of the phase arrangement of any one phase winding in specific embodiment 2 of the present invention.

[0077] Figure 13 is a schematic diagram of the star connection of the three-phase windings in specific embodiment 2 of the present invention.

[0078] Figure 14 is a schematic diagram of the triangular connection of the three-phase windings in specific embodiment 2 of the present invention.

[0079] 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; 411. Fourth support rod; 412. Fourth head; 42. Fourth bend; 5. Stator core; 51. Core slot.

Detailed Implementation Methods

[0080] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0081] Example 1

[0082] As shown in Figures 1 to 3 and Figures 5 to 9, the winding stator of this embodiment includes three-phase windings. Each phase winding includes multiple sets of parallel winding branches. Each set of winding branches includes three branches. Each branch includes multiple coils arranged sequentially and connected in series on the circumferential core slots 51 of the stator core 5. Each branch includes a single coil and a coil with a span of y. The winding of the branch starts with the single coil located at the innermost layer of the slot opening of the core slot 51. The winding continues in the innermost layer of the slot opening (from the slot opening to the bottom of the slot). The first layer uses a single coil as the neutral point lead wire. The coil with a span of y is wound from the innermost layer of the slot opening to the outermost layer of the slot bottom (the last layer from the slot opening to the slot bottom). The coil with a span of y is reversed in the outermost layer of the slot bottom. Then the coil with a span of y is wound from the outermost layer of the slot bottom to the innermost layer of the slot opening. The coil with a span of y-1 is reversed in the innermost layer of the slot opening. This cycle is repeated to achieve branch symmetry.

[0083] Furthermore, in each winding branch, the coils of the same branch are arranged in adjacent core slots 51 within the same core slot layer 51. The difference between two adjacent coils is the ratio of the total number of core slots 51 to the total number of branches. For example, if the total number of core slots 51 is 48 and the total number of branches in each winding group is 3, and the coil in the first core slot 51 is marked as 1, then the coil in the second core slot 51 is marked as 17. By arranging the branches at equal intervals, symmetry is achieved among the branches.

[0084] As shown in Figure 1, in this embodiment, the coil with a span of y includes a first coil 1. The first coil 1 is wound from the innermost layer of the slot opening to the outermost layer of the slot bottom. 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 in parallel to each other and a first head 112 connecting one end of the two first support rods 111. The other end of the two first support rods 111 is provided with a first bending portion 12 to form a welding end. The first bending portion 12 bends along the width direction of the first coil body 11 and away from the first coil body 11.

[0085] As shown in Figure 2, in this embodiment, the coil with a span of y also includes a second coil 2. The second coil 2 is reversed in the outermost layer of the slot bottom. The second coil 2 includes a second coil body 21 and a second bending portion 22. The second coil body 21 includes two parallel second support rods 211 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. The second bending portion 22 bends along one side of the width direction of the second coil body 21.

[0086] As shown in Figure 3, in this embodiment, a single coil includes a third coil 3, which is set in the innermost layer of the slot as a neutral point lead-out line. The third coil 3 includes a third coil body 31 and a third bending part 32. The third coil body 31 includes a third support rod 311, and the third support rod 311 has a third head 312 and a third bending part 32 at both ends, respectively. The third bending part 32 forms a welding end. The bending direction of the third head 312 is opposite to the bending direction of the third bending part 32.

[0087] In this embodiment, the coils in each winding branch are wound from the inside out, with each coil having the same span. The upper and lower edges of the coils are located within the adjacent core slots 51. The coils are then transposed within the same layer through the outermost layer at the bottom of the slot and the innermost layer at the top of the slot to eliminate phase differences between different branches. This ensures that each branch is symmetrical both in the slot and in the layer, meaning that each parallel branch is distributed in a ring-shaped symmetrical structure within the core slot. This achieves a uniform and symmetrical distribution of the windings in each phase, resulting in balanced potentials, no circulating current, and harmonic cancellation, significantly improving motor performance. Furthermore, the flat wire conductors in the same core slot of the winding stator are of the same phase, eliminating the need for phase-to-phase insulation between conductors within the slot, reducing manufacturing difficulty and motor insulation costs.

[0088] In this embodiment, the heads of both the first coil 1 and the second coil 2 are V-shaped or arc-shaped. The coil with a V-shaped head is called a V-shaped coil, and the coil with an arc-shaped head is called a U-shaped coil. In this embodiment, each coil can be either a U-shaped coil or a V-shaped coil. Since all coils use the same shape, irregularly shaped coils and bridging coils are eliminated, thus facilitating assembly and mass production. Of course, in other embodiments, a combination of U-shaped and V-shaped coils can also be used.

[0089] As shown in Figures 8 and 9, in this embodiment, the parallel connection between the branches in each winding branch group is either a star connection or a delta connection. Specifically, the three-phase windings can be connected in a star or delta configuration using a busbar or lead wires.

[0090] In this embodiment, the neutral points of the coil (a31, b31 and c31 in Figure 7) are connected by a busbar. The structure is simple and the height is comparable to that of the welding end, which reduces the height of the winding end and thus reduces the size of the motor.

[0091] Specifically, taking a flat wire winding with 48 slots, 8 poles, 6 layers, and 3 branches as an example, the stator gate end and welded end of the motor are shown in Figures 5 and 6, respectively. The neutral point of the motor is connected through a busbar, resulting in a simple structure. The number of coil layers increases sequentially from the slot opening to the slot bottom. U-phase branch 1: Aa, branch 2: Bb, branch 3: Cc; since there are 2 slots and 3 branches per pole per phase, to achieve branch symmetry, the first layer is an I-type output coil, the first and second layers, the second and third layers, the third and fourth layers, the fourth and fifth layers are U-shaped coils with the same span, and the sixth layer is a U-shaped coil with the same span. The three branches of the U-phase winding are represented by A, B, and C, respectively. a1-A2, a3-A4, and a5-A6 form U-shaped coils, and other branches follow the same pattern.

[0092] Specifically, the first layer uses a single lead coil, the first-second layer, the second-third layer, the third-fourth layer, the fourth-fifth layer, and the fifth-sixth layer all use U-shaped coils with a span of 6, and the sixth layer uses a combination of U-shaped coils with a span of 6 in the same layer.

[0093] The phase winding includes a set of winding branches. The first branch of the winding branches includes 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, a25-A26, a27-A28, a29-A30, and single coil a31; the second branch of the winding branches includes single coil B0, coils b1-B2, b3-B4, b5-B6, b7-B8, b9-B10, b11-B12, b13-B14, and b... 15-B16, b17-B18, b19-B20, b21-B22, b23-B24, b25-B26, b27-B28, b29-B30, single coil b31; the third branch in the winding branch includes 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, c27-C28, c29-C30, single coil c31; the phase winding arrangement is shown in Figure 12.

[0094] Single coils A0, B0, and C0 are all located in the first layer along the bottom of the slot within the core slot 51, serving as the starting point for winding, and their shapes are shown in Figure 3. Single coils a31, b31, and c31 are also located in the first layer along the bottom of the slot within the core slot 51, serving as neutral point leads, and their shapes are also shown in Figure 3. The leads emerge from the gate-shaped end; the welding end is simply cut flat, welded, and coated, requiring no additional processing.

[0095] The spans of a1-A2 and a17-A18 are both 6, with the upper edge located in the second layer of the iron core slot 51 and the lower edge located in the first layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0096] The span of a3-A4 and a19-A20 is 6. The upper edge is located in the second layer of the iron core slot 51, and the lower edge is located in the third layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0097] The span of a5-A6 and a21-A22 is 6. The upper edge is located in the 4th layer of the iron core slot 51, and the lower edge is located in the 5th layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0098] The span of a7-A8 and a23-A24 is 6, and their upper and lower edges are both located in the 6th layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 2.

[0099] The span of a9-A10 and a25-A26 is 6. The upper edge is located in the 5th layer of the iron core slot 51, and the lower edge is located in the 4th layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0100] The span of a11-A12 and a27-A28 is 6. The upper edge is located in the 3rd layer of the iron core slot 51, and the lower edge is located in the 2nd layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0101] The span of a13-A14 and a29-A30 is 6. The upper edge is located in the first layer of the iron core slot 51, and the lower edge is located in the second layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0102] The span between a15 and A16 is 5, and both the upper and lower edges are located in the first layer of the iron core slot 51; they are connected by copper busbars or coils.

[0103] The span of b1-B2 and b17-B18 is 6, with the upper edge located in the second layer of the iron core slot 51 and the lower edge located in the third layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0104] The span of b3-B4 and b19-B20 is 6. The upper edge is located in the 4th layer of the iron core slot 51, and the lower edge is located in the 3rd layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0105] The span of b5-B6 and b21-B22 is 6. The upper edge is located in the 4th layer of the iron core slot 51, and the lower edge is located in the 5th layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0106] The span of b7-B8 and b23-B24 is 6, and their upper and lower edges are both located in the 6th layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 2.

[0107] The span of b9-B10 and b25-B26 is 6, with the upper edge located in the 5th layer of the core slot 51 and the lower edge located in the 4th layer of the core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0108] The span of b11-B12 and b27-B28 is 6. The upper edge is located in the 3rd layer of the iron core slot 51, and the lower edge is located in the 4th layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0109] The span of b13-B14 and b29-B30 is 6. The upper edge is located in the 3rd layer of the iron core slot 51, and the lower edge is located in the 2nd layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0110] The span between b15 and B16 is 5, and both the upper and lower edges are located in the first layer of the iron core slot 51; they are connected by copper busbars or coils.

[0111] The span of c1-C2 and c17-C18 is 6. The upper edge is located in the second layer of the iron core slot 51, and the lower edge is located in the third layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0112] The span of c3-C4 and c19-C20 is 6, with the upper edge located in the 4th layer of the iron core slot 51 and the lower edge located in the 5th layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0113] The span of c5-C6 and c21-C22 is 6, with the upper edge located in the 6th layer of the iron core slot 51 and the lower edge located in the 5th layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0114] The span of c7-C8 and c23-C24 is 6, and their upper and lower edges are both located in the 6th layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 2.

[0115] The span of c9-C10 and c25-C26 is 6, with the upper edge located in the 5th layer of the iron core slot 51 and the lower edge located in the 6th layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0116] The span of c11-C12 and c27-C28 is 6. The upper edge is located in the 5th layer of the iron core slot 51, and the lower edge is located in the 4th layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0117] The span of c13-C14 and c29-C30 is 6. The upper edge is located in the 3rd layer of the iron core slot 51, and the lower edge is located in the 2nd layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0118] The span between C15 and C16 is 5, and both the upper and lower edges are located in the first layer of the iron core slot 51, connected by copper busbars or coils.

[0119] In the first branch of the winding, coil A0 is connected to coils a1-A2 by twist welding, coils a1-A2 are connected to coils a3-A4 by twist welding, coils a3-A4 are connected to coils a5-A6 by twist welding, coils a5-A6 are connected to coils a7-A8 by twist welding, and so on. The coil sequence is from layer 1 to layer 2, layer 2 to layer 3, layer 3 to layer 4, layer 4 to layer 5, and after completing the same layer in layer 6, it returns to layer 5, layer 4 to layer 3, then to layer 2, layer 1, and so on, to complete the winding of the branch. The second and third branches are similar to the first branch, and the windings are transposed by the outermost layer of the bottom slot and the innermost layer of the slot opening coils to achieve three-phase winding symmetry.

[0120] In this embodiment, coils are transposed within the same layer to eliminate phase differences between different branches, ensuring complete symmetry in each branch. This embodiment prioritizes manufacturability; the coils consist of U-shaped coils and single wires, reducing the variety of U-shaped coils. Most coils utilize cross-layer wires, lowering manufacturing difficulty and facilitating mass production. In other embodiments, bus-bar wire replacement can also be used.

[0121] In this embodiment, the stator winding consists of three types of coils, as shown in Figures 1 to 3. The flat wire stator and motor are designed with manufacturability in mind. The coils consist of U-shaped coils and a single type of wire, reducing the variety of U-shaped coils, lowering manufacturing difficulty, and facilitating mass production. By transposing the innermost and outermost coils of the same layer, the three-phase windings are ensured to be completely symmetrical, reducing wire types and eliminating irregular wire shapes, greatly reducing the complexity of winding fabrication. Only twisting at the winding welding ends facilitates production and eliminates a series of problems caused by asymmetry in each branch. The three-phase windings can be connected in star or delta configurations via busbars or leads, resulting in a compact structure.

[0122] As shown in Figures 5 and 6, this embodiment also provides a stator, which includes a stator core 5 and the aforementioned winding stator. The stator core 5 has 48 core slots 51 arranged circumferentially on its inner wall. A portion of the phase windings in the winding stator are wound within the core slots 51, while the remaining portion is located outside the core slots 51. Each core slot 51 contains 6 layers of phase windings of the same phase, and the number of layers in each core slot 51 is the same. It can be understood that in practical applications, the number of winding layers in each stator slot is not limited to 6 layers, but can also be 2, 4, or 8 layers, etc., and the winding method can refer to the aforementioned 6-layer winding method.

[0123] This embodiment also provides a flat wire motor including the above-described winding stator, which can be applied to electric vehicles (EVs), pure electric vehicles (PEVs / BEVs), hybrid electric vehicles (HEVs), range-extended electric vehicles (REEVs), plug-in hybrid electric vehicles (PHEVs), and new energy vehicles. In the flat wire corrugated motor of this embodiment, the corrugated flat wire does not require welding, has no solder joints, and offers high design flexibility, reducing processing steps, simplifying the process, and lowering costs.

[0124] This embodiment also provides a vehicle including the above-mentioned motor, which can be an electric vehicle (EV), a pure electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range-extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), a new energy vehicle, etc.

[0125] In this embodiment, the motor consists of three types of coils. The innermost and outermost coils are swapped to eliminate the phase difference between different branches and ensure that each branch is completely symmetrical.

[0126] Example 2

[0127] As shown in Figures 1, 3, 4, and 10 to 14, the winding stator of this embodiment has a similar structural configuration and working principle to the winding stator in Embodiment 1. By replacing the two identical coils with a span of 6 in the 6th layer of Embodiment 1 with concentric coils with the same span, while keeping other wire types and welding ends unchanged, the coils are rearranged and the number of each wire type is changed, thus transforming it into a 48-slot, 6-layer, 8-pole, 2-branch flat wire winding.

[0128] Specifically, the winding stator includes three-phase windings, each phase winding includes multiple sets of parallel winding branches, each set of winding branches includes two branches, each branch includes multiple coils arranged sequentially and connected in series on the circumferential core slots 51 of the stator core 5. Each branch includes a single coil and a coil with a span of y. The branch starts winding with the single coil located at the innermost layer of the slot opening of the core slot 51. In the innermost layer of the slot opening (the first layer from the slot opening to the bottom of the slot), the single coil is used as the neutral point lead-out line. The lapped coil with a span of y is wound from the second innermost layer of the slot opening to the outermost layer of the slot bottom (the last layer from the slot opening to the bottom of the slot). The concentric coil with a span of y is reversed in the same layer at the outermost layer of the slot bottom. Then the lapped coil with a span of y is wound from the second outermost layer of the slot bottom to the innermost layer of the slot opening. This cycle is repeated to achieve branch symmetry.

[0129] Furthermore, the two branches have the same winding method, and the two branches are alternately arranged in adjacent iron core slots 51.

[0130] As shown in Figure 4, in this embodiment, the concentric coil with a span of y includes a fourth coil 4. The fourth coil 4 is reversed in the outermost layer of the bottom of the slot. The fourth coil 4 includes a fourth coil body 41 and a fourth bending portion 42. The fourth coil body 41 includes two parallel fourth support rods 411 and a fourth head 412 connecting one end of the two fourth support rods 411. The other end of the two fourth support rods 411 is provided with a fourth bending portion 42 to form a welding end. The fourth bending portion 42 bends along one side of the width direction of the fourth coil body 41.

[0131] As shown in Figures 13 and 14, in this embodiment, the parallel connection between the branches in each winding branch group is either a star connection or a delta connection. Specifically, the three-phase windings can be connected in a star or delta configuration using a busbar or lead wires.

[0132] Specifically, taking a flat wire winding with 48 slots, 8 poles, 6 layers, and 2 branches as an example, the stator gate end and welded end of the motor are shown in Figures 10 and 11 respectively. The neutral point of the motor is connected through a busbar, resulting in a simple structure. The number of coil layers increases sequentially from the slot opening to the slot bottom. U-phase branches: Aa, Bb. Since there are 2 slots per pole and 2 branches per phase, to achieve branch symmetry, the first layer uses a single lead coil, and the first-to-second, second-to-third, third-to-fourth, fourth-to-fifth, and fifth-to-sixth layers all use U-shaped coils with a span of 6. The sixth layer uses concentric U-shaped coils with a span of 6. Among them, the U-phase winding branches are represented by A, a1-A2, a3-A4, a5-A6 forming U-shaped coils, and by B, b1-B2, b3-B4, b5-B6 forming U-shaped coils, and so on.

[0133] A phase winding includes a set of winding branches. One 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, a25-A26, a27-A28, a29-A30, a31-A32, a33-A34, a35-A36, a37-A38, a39-A40, a41-A42, a43-A44, a45-A46, and a... 47; Another 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, b27-B28, b29-B30, b31-B32, b33-B34, b35-B36, b37-B38, b39-B40, b41-B42, b43-B44, b45-B46, and b47; the phase winding arrangement is shown in Figure 12.

[0134] Both branches have the same winding method. Single coil A0 and single coil B0 are both located in the first layer along the bottom of the slot in the iron core slot 51, serving as the starting point for winding, and their shapes are shown in Figure 3. Single coil a47 and single coil b47 are both located in the first layer along the bottom of the slot in the iron core slot 51, serving as neutral point leads. The leads emerge from the gate-shaped end, and the welding end is simply cut flat, welded, and coated, requiring no additional processing.

[0135] The span of a1-A2, a3-A4, a5-A6, a40-A41, b1-B2, b3-B4, b5-B6 and b40-B41 is 6. The upper edge is located in the second layer of the iron core slot 51 and the lower edge is located in the first layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0136] The span of a7-A8 and b7-B8 is 6. The upper edge is located in the second layer of the iron core slot 51, and the lower edge is located in the third layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0137] The spans of a9-A10, a11-A12, a13-A14, b9-B10, b11-B12, and b13-B14 are all 6. Their upper edge is located in the 4th layer of the iron core slot 51, and their lower edge is located in the 3rd layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0138] The span of a15-A16 and b15-B16 is 6. The upper edge is located in the 4th layer of the iron core slot 51, and the lower edge is located in the 5th layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0139] The spans of a17-A18, a19-A20, a21-A22, b17-B18, b19-B20, and b21-B22 are all 6. Their upper edge is located in the 6th layer of the iron core slot 51, and their lower edge is located in the 5th layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0140] The span of a23-A24 and b23-B24 is 6, and their upper and lower edges are both located in the 6th layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 4.

[0141] The span of a25-A26, a27-A28, a29-A30, b25-B26, b27-B28 and b29-B30 is 6. The upper edge is located in the 5th layer of the iron core slot 51 and the lower edge is located in the 6th layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0142] The span of a31-A32 and b31-B32 is 6. The upper edge is located in the 5th layer of the iron core slot 51, and the lower edge is located in the 4th layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0143] The spans of a33-A34, a35-A36, a37-A38, b33-B34, b35-B36, and b37-B38 are all 6. Their upper edge is located in the 3rd layer of the iron core slot 51, and their lower edge is located in the 4th layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0144] The span of a39-A40 and b39-B40 is 6. The upper edge is located in the 3rd layer of the iron core slot 51, and the lower edge is located in the 2nd layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0145] The span of a41-A42, a43-A44, a45-A46, b41-B42, b43-B44 and b45-B46 is 6. The upper edge is located in the first layer of the iron core slot 51 and the lower edge is located in the second layer of the iron core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

[0146] In the first branch, coil A0 is connected to coils a1-A2 via twist welding, coils a1-A2 are connected to coils a3-A4 via twist welding, coils a3-A4 are connected to coils a5-A6 via twist welding, coils a5-A6 are connected to coils a7-A8 via twist welding, and so on. The coil connection sequence transitions from layers 1 and 2, to layers 3 and 4, then to layers 5 and 6, and finally, on layer 6, concentric coils are used for same-layer bridging, before being sequentially connected to layer 1. This cycle is repeated to complete the winding of the first branch. The winding of the second branch follows the same pattern. The windings are transposed at the outermost layer of the slot bottom to achieve symmetry in the three-phase windings. In this embodiment, with the welding ends unchanged, windings compatible with different branch schemes are achieved, allowing for flexible conversion of different numbers of parallel branches as needed, while reducing manufacturing difficulty.

[0147] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, based on the methods and techniques disclosed above, without departing from the spirit and technical essence of the invention. Therefore, any simple modifications, equivalent substitutions, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the scope of protection of the present invention.

Claims

1. A 48-slot 8-pole distributed-winding stator, characterized in that, The three-phase phase winding comprises a plurality of parallel groups of winding branches, each group of winding branches comprising at least two branches, the branches comprising a plurality of coils arranged in sequence on a circumferential core slot (51) of a stator core (5) and connected in series with each other, the branches comprising single coils and coils with a span of y, the branches being wound starting from a single coil located at the innermost layer of the slot opening of the core slot (51), the single coil being used as a neutral point lead at the innermost layer of the slot opening, and the coils with a span of y being wound from the next inner layer of the slot opening to the outermost layer of the slot bottom, the coils being commutated in any one of the following ways during winding: way one: the coils with a span of y are commutated in the same layer at the outermost layer of the slot bottom, and the coils with a span of y are wound from the next outer layer of the slot bottom to the innermost layer of the slot opening, and the coils with a span of y-1 are commutated in the same layer at the innermost layer of the slot opening; way two: the concentric coils with a span of y are commutated in the same layer at the outermost layer of the slot bottom, and the coils with a span of y are wound from the next outer layer of the slot bottom to the innermost layer of the slot opening.

2. The 48-slot 8-pole distributed-winding motor stator of claim 1, wherein, Each group of winding branches comprises three branches, in the same layer core slot (51), the coils of the same branch are arranged in adjacent core slots (51), and the difference between adjacent coils is the ratio of the total number of core slots (51) to the total number of branches.

3. The 48-slot 8-pole distributed-winding motor stator of claim 1 wherein, Each group of winding branches comprises two branches, the two branches have the same winding mode, and the two branches are alternately arranged in adjacent core slots (51).

4. The 48-slot 8-pole distributed-winding motor stator of claim 1 wherein, The coil with a span of y comprises a first coil (1), the first coil (1) is wound from the next inner layer of the slot opening to the next outer layer of the slot bottom, the first coil (1) comprises a first coil body (11) and a first bending part (12), the first coil body (11) comprises two first branch rods (111) arranged in parallel and a first head (112) connected to one end of the two first branch rods (111), the other end of the two first branch rods (111) is provided with a first bending part (12) to form a welding end, and the first bending part (12) is bent along the width direction of the first coil body (11) and away from the first coil body (11).

5. The 48-slot 8-pole distributed-winding motor stator of claim 1 wherein, The coil with a span of y further comprises a second coil (2), the second coil (2) is commutated in the same layer at the outermost layer of the slot bottom, the second coil (2) comprises a second coil body (21) and a second bending part (22), the second coil body (21) comprises two second branch rods (211) arranged in parallel and a second head (212) connected to one end of the two second branch rods (211), the other end of the two second branch rods (211) is provided with a second bending part (22) to form a welding end, and the second bending part (22) is bent along one side of the width direction of the second coil body (21).

6. The 48-slot 8-pole distributed-winding motor of claim 1, wherein, The single coil comprises a third coil (3) arranged at the innermost layer of the slot opening as a neutral point lead-out wire, the third coil (3) comprises a third coil body (31) and a third bending portion (32), the third coil body (31) comprises a third branch rod (311), the third branch rod (311) is respectively provided with a third head (312) and the third bending portion (32) at both ends, and the third bending portion (32) forms a welding end; and the bending direction of the third head (312) is opposite to that of the third bending portion (32).

7. The 48-slot 8-pole fractional-slot concentric winding stator of claim 1, wherein, The concentric coil with a span of y comprises a fourth coil (4) which is reversed at the same layer at the outermost layer of the slot bottom, the fourth coil (4) comprises a fourth coil body (41) and a fourth bending portion (42), the fourth coil body (41) comprises two fourth branch rods (411) arranged in parallel and a fourth head (412) connected to one end of the two fourth branch rods (411), and the other end of the two fourth branch rods (411) is provided with the fourth bending portion (42) to form a welding end, and the fourth bending portion (42) is bent along one side of the width direction of the fourth coil body (41).

8. The 48-slot 8-pole distributed-winding motor stator of claim 2 wherein, The phase winding comprises a group of winding branches, the first branch in the winding branch comprises 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, a25-A26, a27-A28, a29-A30, a single coil a31; the second branch in the winding branch comprises 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, b27-B28, b29-B30, a single coil b31; the third branch in the winding branch comprises 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, c27-C28, c29-C30, a single coil c31; The single coil A0, the single coil B0 and the single coil C0 are located at the 1st layer of the slot opening along the slot bottom direction in the core slot (51) as the starting of winding; the single coil a31, the single coil b31 and the single coil c31 are located at the 1st layer of the slot opening along the slot bottom direction in the core slot (51) as the neutral point lead-out wire; The span of a1-A2 and a17-A18 is y, and the upper layer edge is located at the 2nd layer of the core slot (51), and the lower layer edge is located at the 1st layer of the core slot (51). The span of a3-A4, a19-A20 is y, the upper layer edge is located at the 2nd layer of the core slot (51), and the lower layer edge is located at the 3rd layer of the core slot (51); The span of a5-A6, a21-A22 is y, the upper layer edge is located at the 4th layer of the core slot (51), and the lower layer edge is located at the 5th layer of the core slot (51); The span of a7-A8, a23-A24 is y, the upper layer edge and the lower layer edge are both located at the 6th layer of the core slot (51); The span of a9-A10, a25-A26 is y, the upper layer edge is located at the 5th layer of the core slot (51), and the lower layer edge is located at the 4th layer of the core slot (51); The span of a11-A12, a27-A28 is y, the upper layer edge is located at the 3rd layer of the core slot (51), and the lower layer edge is located at the 2nd layer of the core slot (51); The span of a13-A14, a29-A30 is y, the upper layer edge is located at the 1st layer of the core slot (51), and the lower layer edge is located at the 2nd layer of the core slot (51); The span of a15-A16 is y-1, the upper layer edge and the lower layer edge are both located at the 1st layer of the core slot (51); The span of b1-B2, b17-B18 is y, the upper layer edge is located at the 2nd layer of the core slot (51), and the lower layer edge is located at the 3rd layer of the core slot (51); The span of b3-B4, b19-B20 is y, the upper layer edge is located at the 4th layer of the core slot (51), and the lower layer edge is located at the 3rd layer of the core slot (51); The span of b5-B6, b21-B22 is y, the upper layer edge is located at the 4th layer of the core slot (51), and the lower layer edge is located at the 5th layer of the core slot (51); The span of b7-B8, b23-B24 is y, the upper layer edge and the lower layer edge are both located at the 6th layer of the core slot (51); The span of b9-B10, b25-B26 is y, the upper layer edge is located at the 5th layer of the core slot (51), and the lower layer edge is located at the 4th layer of the core slot (51); The span of b11-B12, b27-B28 is y, the upper layer edge is located at the 3rd layer of the core slot (51), and the lower layer edge is located at the 4th layer of the core slot (51); The span of b13-B14, b29-B30 is y, the upper layer edge is located at the 3rd layer of the core slot (51), and the lower layer edge is located at the 2nd layer of the core slot (51); The span of b15-B16 is y-1, the upper layer edge and the lower layer edge are both located at the 1st layer of the core slot (51); The span of c1-C2, c17-C18 is y, the upper layer edge is located at the 2nd layer of the core slot (51), and the lower layer edge is located at the 3rd layer of the core slot (51); The span of c3-C4, c19-C20 is y, the upper layer edge is located at the 4th layer of the core slot (51), and the lower layer edge is located at the 5th layer of the core slot (51); The span of c5-C6, c21-C22 is y, the upper layer edge is located at the 6th layer of the core slot (51), and the lower layer edge is located at the 5th layer of the core slot (51); The span of c7-C8, c23-C24 is y, the upper layer edge and the lower layer edge are both located at the 6th layer of the core slot (51); ​ The span of c9-c10 and c25-c26 is y, the upper layer edge is located at the 5th layer of the core slot (51), and the lower layer edge is located at the 6th layer of the core slot (51); The span of c11-c12 and c27-c28 is y, the upper layer edge is located at the 5th layer of the core slot (51), and the lower layer edge is located at the 4th layer of the core slot (51); The span of c13-c14 and c29-c30 is y, the upper layer edge is located at the 3rd layer of the core slot (51), and the lower layer edge is located at the 2nd layer of the core slot (51); The span of c15-c16 is y-1, and the upper layer edge and the lower layer edge are both located at the 1st layer of the core slot (51); In the first branch of the winding, the coil A0 is connected to the coil a1-A2 through the twist head welding, the coil a1-A2 is connected to the coil a3-A4 through the twist head welding, the coil a3-A4 is connected to the coil a5-A6 through the twist head welding, the coil a5-A6 is connected to the coil a7-A8 through the twist head welding, and so on; the coil sequence is from the 1st layer to the 2nd layer, the 2nd layer to the 3rd layer, the 3rd layer to the 4th layer, the 4th layer to the 5th layer, and then the same layer in the 6th layer returns to the 5th layer, and then the 4th layer returns to the 3rd layer, the 2nd layer, and the 1st layer, and so on, to complete the winding of the winding branch; The second branch and the third branch are similar to the first branch, and the winding is transposed through the same layer coils of the outermost layer of the slot bottom and the innermost layer of the slot opening to realize the symmetry of the three-phase winding.

9. The 48-slot 8-pole distributed-winding motor of claim 3, wherein, The phase winding includes a group of winding branches, one 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, a25-A26, a27-A28, a29-A30, a31-A32, a33-A34, a35-A36, a37-A38, a39-A40, a41-A42, a43-A44, a45-A46, a47; another 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, b27-B28, b29-B30, b31-B32, b33-B34, b35-B36, b37-B38, b39-B40, b41-B42, b43-B44, b45-B46, b47; The two branches have the same winding mode, the single coil A0 and the single coil B0 are both located at the 1st layer in the core slot (51) along the slot bottom direction, as the starting of winding; the single coil a47 and the single coil b47 are both located at the 1st layer in the core slot (51) along the slot bottom direction, as the neutral point lead-out wire. The span of a1-A2, a3-A4, a5-A6, a40-A41, b1-B2, b3-B4, b5-B6 and b40-B41 is y, the upper edge of which is located at the 2nd layer of the core slot (51), and the lower edge is located at the 1st layer of the core slot (51); The span of a7-A8, b7-B8 is y, the upper edge of which is located at the 2nd layer of the core slot (51), and the lower edge is located at the 3rd layer of the core slot (51); The span of a9-A10, a11-A12, a13-A14, b9-B10, b11-B12 and b13-B14 is y, the upper edge of which is located at the 4th layer of the core slot (51), and the lower edge is located at the 3rd layer of the core slot (51); The span of a15-A16, b15-B16 is y, the upper edge of which is located at the 4th layer of the core slot (51), and the lower edge is located at the 5th layer of the core slot (51); The span of a17-A18, a19-A20, a21-A22, b17-B18, b19-B20 and b21-B22 is y, the upper edge of which is located at the 6th layer of the core slot (51), and the lower edge is located at the 5th layer of the core slot (51); The span of a23-A24, b23-B24 is y, the upper edge and the lower edge of which are located at the 6th layer of the core slot (51); The span of a25-A26, a27-A28, a29-A30, b25-B26, b27-B28 and b29-B30 is y, the upper edge of which is located at the 5th layer of the core slot (51), and the lower edge is located at the 6th layer of the core slot (51); The span of a31-A32, b31-B32 is y, the upper edge of which is located at the 5th layer of the core slot (51), and the lower edge is located at the 4th layer of the core slot (51); The span of a33-A34, a35-A36, a37-A38, b33-B34, b35-B36 and b37-B38 is y, the upper edge of which is located at the 3rd layer of the core slot (51), and the lower edge is located at the 4th layer of the core slot (51); The span of a39-A40, b39-B40 is y, the upper edge of which is located at the 3rd layer of the core slot (51), and the lower edge is located at the 2nd layer of the core slot (51); The span of a41-A42, a43-A44, a45-A46, b41-B42, b43-B44 and b45-B46 is y, the upper edge of which is located at the 1st layer of the core slot (51), and the lower edge is located at the 2nd layer of the core slot (51); In the first branch, the coil A0 is connected with the coil a1-A2 through the twist head welding, the coil a1-A2 is connected with the coil a3-A4 through the twist head welding, the coil a3-A4 is connected with the coil a5-A6 through the twist head welding, the coil a5-A6 is connected with the coil a7-A8 through the twist head welding, and so on; the coil connection sequence is from the 1st layer and the 2nd layer, transitions to the 3rd layer and the 4th layer, further transitions to the 5th layer and the 6th layer, finally realizes the same-layer cross-connection through the concentric coil in the 6th layer, and is sequentially connected to the 1st layer, and so on, so as to complete the winding of the first branch, and the winding of the second branch is sequentially continued.

10. A flat wire motor characterized by The stator includes the 48-slot 8-pole flat wire winding as claimed in any one of claims 1 to 9. The stator includes the 48-slot 8-pole flat wire winding as claimed in any one of claims 1 to 9.

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