Flat wire winding, stator having same, electric machine and vehicle

Abstract

The application discloses a flat wire winding, a stator, a motor and a vehicle with the same, the flat wire winding comprises three-phase phase windings, each phase winding comprises a plurality of groups of parallel winding branches, each group of winding branches comprises four parallel branches; the four branches each comprise coils with a span of y-1, y and y+2, and the winding directions of the four branches are the same; or, the four branches each comprise coils with a span of y, wherein two of the branches each further comprise coils with a span of y-2 and y+1, and the other two of the branches each comprise coils with a span of y-1 and y+2, and the winding directions of the two adjacent branches are opposite. The application has the advantages of compact structure, balanced potential of each branch, no circulating current and the like, adopts a winding arrangement mode combining different spans and different types of coils, reduces wire types and eliminates special-shaped wires, reduces the manufacturing process difficulty, and eliminates a series of problems caused by the asymmetry of each branch.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electric machines, and particularly relates to a flat wire winding, a stator with the same, an electric machine and a vehicle. BACKGROUND

[0002] With the rapid development of new energy automobile technology, the driving motor as the heart of electric vehicles has higher and higher performance requirements. At present, high speed, light weight and high efficiency have become the development trend of driving motors, and higher requirements are put forward for the power density, high efficiency area and heat dissipation capacity of the motor.

[0003] The flat wire winding can be divided into round wire and flat wire. Compared with the round wire winding, the flat wire winding can effectively improve the slot fill rate of the motor, reduce the copper loss of the motor and thus improve the efficiency of the motor, and can also reduce the height of the motor winding end and thus reduce the volume of the motor and improve the power / torque density. However, the flat wire winding has inherent skin effect phenomenon, especially for high-speed motors, the skin effect is particularly obvious. In order to reduce the skin effect, the existing technology increases the number of conductors in the stator slot, such as 4 layers, 6 layers, 8 layers, etc., which leads to complex processing technology and high cost.

[0004] Because the conductors of each parallel branch are distributed at different positions of the inner diameter of the stator slot, especially when the number of slots per pole per phase of the motor is odd and the number of branches is even, it is difficult to achieve symmetry. If the branches are not symmetrical, there will be large differences in back electromotive force, resistance and inductance, thereby forming circulating current, increasing additional loss and power, and causing local overheating of the motor winding, reducing the service life of the motor. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a flat wire winding with compact structure, simple manufacturing, symmetrical branches and neat arrangement, a motor with the same and a vehicle.

[0006] To solve the above technical problems, the present application adopts the following technical scheme:

[0007] A flat wire winding, comprising three-phase phase windings, each of the phase windings comprising a plurality of parallel winding branches, each of the winding branches comprising four parallel branches, each of the branches comprising a plurality of coils arranged in sequence on the 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 comprises coils with a span of y-1, y and y+2, the winding directions of the four branches are the same, and each of the four branches is wound from the outermost layer of the slot opening to the innermost layer of the slot bottom, and then wound from the innermost layer of the slot bottom to the outermost layer of the slot opening, and the coils with different spans are transposed at the outermost layer of the slot opening; the above process is repeated to achieve branch symmetry.

[0009] Or, the four branches each include a coil with a span of y, two of the branches each further include a coil with a span of y-2 and y+1, and the other two branches each include a coil with a span of y-1 and y+2; the winding directions of the two adjacent branches among the four branches are opposite, one of the branches is wound from the innermost layer of the groove bottom to the outermost layer of the slot, then from the outermost layer of the slot to the innermost layer of the groove bottom, and transposed at the innermost layer of the groove bottom through coils with different spans; the other adjacent branch is wound from the outer layer of the slot to the innermost layer of the groove bottom, then from the innermost layer of the groove bottom to the outermost layer of the slot, and transposed at the outermost layer of the slot through coils with different spans; and the process is repeated to achieve branch symmetry.

[0010] As a further improvement of the application, the winding method adopted by the four branches is as follows: a same-layer coil with a span of y+2 is arranged at the outermost layer of the slot, and a coil with a span of y is used to wind from the outer layer of the slot to the innermost layer of the groove bottom in a preset sequence direction, a same-layer coil with a span of y is arranged at the innermost layer of the groove bottom, and a coil with a span of y is used to wind from the innermost layer of the groove bottom to the outer layer of the slot in a preset sequence direction, and a same-layer transposition is performed at the outermost layer of the slot through a coil with a span of y-1, and the process is repeated to achieve branch symmetry.

[0011] As a further improvement of the application, the winding method adopted by one of the two adjacent branches is as follows: a coil with a span of y is used to wind from the innermost layer of the groove bottom to the outer layer of the slot in a preset sequence direction, and a same-layer coil with a span of y is arranged at the outermost layer of the slot, then a coil with a span of y is used to wind from the outer layer of the slot to the innermost layer of the groove bottom in a preset sequence direction, and a same-layer transposition is performed at the innermost layer of the groove bottom through a coil with a span of y-2 or y+1, and the process is repeated to achieve branch symmetry.

[0012] As a further improvement of the application, the winding method adopted by the other of the two adjacent branches is as follows: a coil with a span of y is used to wind from the outer layer of the slot to the innermost layer of the groove bottom in a preset sequence direction, and a same-layer coil with a span of y is arranged at the innermost layer of the groove bottom, then a coil with a span of y is used to wind from the innermost layer of the groove bottom to the outer layer of the slot in a preset sequence direction, and a same-layer transposition is performed at the outermost layer of the slot through a coil with a span of y-1 or y+2, and the process is repeated to achieve branch symmetry.

[0013] As a further improvement of the present application, the winding mode of one of the two adjacent branches is that: the coils with span y are wound from the inner layer of the bottom of the slot to the outer layer of the slot opening in the preset sequence direction, and the same layer coils with span y are arranged at the outermost layer of the slot opening, then the coils with span y are wound from the outer layer of the slot opening to the inner layer of the bottom of the slot in the preset sequence direction, and the same layer transposition is performed at the innermost layer of the bottom of the slot by the coils with span y-1 or y+2, and the cycle is repeated to realize the symmetry of the branch.

[0014] As a further improvement of the present application, the winding mode of the other of the two adjacent branches is that: the coils with span y are wound from the outer layer of the slot opening to the inner layer of the bottom of the slot in the preset sequence direction, and the same layer coils with span y are arranged at the innermost layer of the bottom of the slot, then the coils with span y are wound from the inner layer of the bottom of the slot to the outer layer of the slot opening in the preset sequence direction, and the same layer transposition is performed at the outermost layer of the slot opening by the coils with span y-2 or y+1, and the cycle is repeated to realize the symmetry of the branch.

[0015] As a further improvement of the present application, the coil with span y includes a first coil, the first coil includes a first coil body and a first bending portion, the first coil body includes two first branches arranged in parallel and a first head connected to one end of the two first branches, and the other end of the two first branches is 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 application, the coil with span y further includes a second coil, the second coil includes a second coil body and a second bending portion, the second coil body includes two second branches arranged in parallel and a second head connected to one end of the two second branches, and the other end of the two second branches is provided with a second bending portion to form a welding end, and the second bending portion is bent along the width direction of the second coil body and away from the second coil body.

[0017] As a further improvement of the present application, the coils with span y-1, y-2, y+1 and y+2 all include a third coil, the third coil includes a third coil body and a third bending portion, the third coil body includes two third branches arranged in parallel and a third head connected to one end of the two third branches, and the other end of the two third branches is provided with a third bending portion to form a welding end, and the third bending portion is bent along one side of the width direction of the third coil body; the bending directions of the first bending portion and the third bending portion are opposite.

[0018] As a further improvement of the present application, the phase winding comprises a set of winding branches, the first of the winding branches comprises coils A1-a2, A3-a4, A5-a6, A7-a8, A9-a10, A11-a12, A13-a14, the second of the winding branches comprises coils B1-b2, B3-b4, B5-b6, B7-b8, B9-b10, B11-b12, B13-b14, the third of the winding branches comprises coils C1-c2, C3-c4, C5-c6, C7-c8, C9-c10, C11-c12, C13-c14, and the fourth of the winding branches comprises coils D1-d2, D3-d4, D5-d6, D7-d8, D9-d10, D11-d12, D13-d14;

[0019] The four branches are wound in the same direction and are symmetrical to each other;

[0020] The span of coils A1-a2, B1-b2, C1-c2, D1-d2 is y+2, and the upper and lower layers thereof are located at the 6th layer of the core slot;

[0021] The span of coils A3-a4, B3-b4, C3-c4, D3-d4 is y, and the upper layers thereof are located at the 5th layer of the core slot, and the lower layers thereof are located at the 4th layer of the core slot;

[0022] The span of coils A5-a6, B5-b6, C5-c6, D5-d6 is y, and the upper layers thereof are located at the 3rd layer of the core slot, and the lower layers thereof are located at the 2nd layer of the core slot;

[0023] The span of coils A7-a8, B7-b8, C7-c8, D7-d8 is y, and the upper and lower layers thereof are located at the 1st layer of the core slot;

[0024] The span of coils A9-a10, B9-b10, C9-c10, D9-d10 is y, and the upper layers thereof are located at the 2nd layer of the core slot, and the lower layers thereof are located at the 3rd layer of the core slot;

[0025] The span of coils A11-a12, B11-b12, C11-c12, D11-d12 is y, and the upper layers thereof are located at the 4th layer of the core slot, and the lower layers thereof are located at the 5th layer of the core slot;

[0026] The span of coils A13-a14, B13-b14, C13-c14, D13-d14 is y-1, and the upper and lower layers thereof are located at the 1st layer of the core slot;

[0027] The coil A1-a2 is connected with the coil A3-a4 by a twist head welding, the coil A3-a4 is connected with the coil A5-a6 by a twist head welding, the coil A5-a6 is connected with the coil A7-a8 by a twist head welding, and so on; the coil connection sequence is from the 6th layer, the 5th layer to the 4th layer, the 3rd layer to the 2nd layer, and then to the 1st layer, and then the same layer is walked and returned to the 2nd layer until the 6th layer, and so on.

[0028] As a further improvement of the application, the phase winding comprises a set of winding branches, the first branch of the winding branch comprises the coils A1-a2, A3-a4, A5-a6, A7-a8, A9-a10, A11-a12, the second branch comprises the coils B1-b2, B3-b4, B5-b6, B7-b8, B9-b10, B11-b12, the third branch comprises the coils C1-c2, C3-c4, C5-c6, C7-c8, C9-c10, C11-c12, and the fourth branch comprises the coils D1-d2, D3-d4, D5-d6, D7-d8, D9-d10, D11-d12.

[0029] 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.

[0030] The span of the coils A1-a2, B1-b2, C1-c2 and D1-d2 is y; the upper edge layer of the coils A1-a2 and C1-c2 is located at the 2nd layer of the core slot, and the lower edge layer is located at the 3rd layer of the core slot; the upper edge layer of the coils B1-b2 and D1-d2 is located at the 5th layer of the core slot, and the lower edge layer is located at the 4th layer of the core slot.

[0031] The span of the coils A3-a4, B3-b4, C3-c4 and D3-d4 is y; the upper edge layer of the coils A3-a4 and C3-c4 is located at the 4th layer of the core slot, and the lower edge layer is located at the 5th layer of the core slot; the upper edge layer of the coils B3-b4 and D3-d4 is located at the 3rd layer of the core slot, and the lower edge layer is located at the 2nd layer of the core slot.

[0032] The span of the coils A5-a6, B5-b6, C5-c6 and D5-d6 is y; the upper edge layer and the lower edge layer of the coils A5-a6 and C5-c6 are located at the 6th layer of the core slot; the upper edge layer and the lower edge layer of the coils B5-b6 and D5-d6 are located at the 1st layer of the core slot.

[0033] The span of the coils A7-a8, B7-b8, C7-c8 and D7-d8 is y, the upper edge of the coils A7-a8 and C7-c8 is located at the 5th layer of the core slot, and the lower edge is located at the 4th layer of the core slot; the upper edge of the coils B7-b8 and D7-d8 is located at the 2nd layer of the core slot, and the lower edge is located at the 3rd layer of the core slot;

[0034] The span of the coils A9-a10, B9-b10, C9-c10 and D9-d10 is y, the upper edge of the coils A9-a10 and C9-c10 is located at the 3rd layer of the core slot, and the lower edge is located at the 2nd layer of the core slot; the upper edge of the coils B9-b10 and D9-d10 is located at the 4th layer of the core slot, and the lower edge is located at the 5th layer of the core slot;

[0035] The span of the coils A11-a12 and C11-c12 is y+1, and the upper edge and the lower edge are located at the 1st layer of the core slot; the span of the coils B11-b12 and D11-d12 is y-1, and the upper edge and the lower edge are located at the 6th layer of the core slot;

[0036] In the first branch, the coil A1-a2 is connected to the coil A3-a4 through a twist head welding, the coil A3-a4 is connected to the coil A5-a6 through a twist head welding, and the coil A5-a6 is connected to the coil A7-a8 through a twist head welding; the coil connection sequence is from the 2nd layer to the 3rd layer, the 3rd layer to the 4th layer, the 4th layer to the 5th layer, the 5th layer to the 6th layer, and the 6th layer, and then returning to the 5th layer until the 1st layer, and so on; the third branch is similarly connected.

[0037] In the second branch, the coil B1-b2 is connected through a twist head welding, the coil B1-d2 is connected to the coil B3-b4 through a twist head welding, the coil B3-b4 is connected to the coil B5-b6 through a twist head welding, the coil B5-b6 is connected to the coil B7-b8 through a twist head welding, and the coil connection sequence is from the 5th layer to the 4th layer, the 4th layer to the 3rd layer, the 3rd layer to the 2nd layer, and the 2nd layer to the 1st layer, and then returning to the 2nd layer until the 6th layer, and so on; the fourth branch is similarly connected.

[0038] As a further improvement of the application, the phase winding comprises a set of winding branches, the first winding branch comprises coils A1-a2, A3-a4, A5-a6, A7-a8, A9-a10, A11-a12, the second winding branch comprises coils B1-b2, B3-b4, B5-b6, B7-b8, B9-b10, B11-b12, the third winding branch comprises coils C1-c2, C3-c4, C5-c6, C7-c8, C9-c10, C11-c12, and the fourth winding branch comprises coils D1-d2, D3-d4, D5-d6, D7-d8, D9-d10, D11-d12;

[0039] The first winding branch and the third winding branch have the same winding direction, and the second winding branch and the fourth winding branch have the same winding direction.

[0040] The span of coils A1-a2, B1-b2, C1-c2 and D1-d2 is y; the upper layer of coils A1-a2 and C1-c2 is located at the second layer of the core slot, and the lower layer is located at the third layer of the core slot; the upper layer of coils B1-b2 and D1-d2 is located at the fifth layer of the core slot, and the lower layer is located at the fourth layer of the core slot.

[0041] The span of coils A3-a4, B3-b4, C3-c4 and D3-d4 is y; the upper layer of coils A3-a4 and C3-c4 is located at the fourth layer of the core slot, and the lower layer is located at the fifth layer of the core slot; the upper layer of coils B3-b4 and D3-d4 is located at the third layer of the core slot, and the lower layer is located at the second layer of the core slot.

[0042] The span of coils A5-a6, B5-b6, C5-c6 and D5-d6 is y; the upper layer and the lower layer of coils A5-a6 and C5-c6 are located at the sixth layer of the core slot; the upper layer and the lower layer of coils B5-b6 and D5-d6 are located at the first layer of the core slot.

[0043] The span of coils A7-a8, B7-b8, C7-c8 and D7-d8 is y; the upper layer of coils A7-a8 and C7-c8 is located at the fifth layer of the core slot, and the lower layer is located at the fourth layer of the core slot; the upper layer of coils B7-b8 and D7-d8 is located at the second layer of the core slot, and the lower layer is located at the third layer of the core slot.

[0044] The span of coils A9-a10, B9-b10, C9-c10 and D9-d10 is y; the upper layer of coils A9-a10 and C9-c10 is located at the third layer of the core slot, and the lower layer is located at the second layer of the core slot; the upper layer of coils B9-b10 and D9-d10 is located at the fourth layer of the core slot, and the lower layer is located at the fifth layer of the core slot.

[0045] The span of the coils A11-a12 and C11-c12 is y-1, and the upper and lower layers thereof are located at the 1st layer of the core slot; the span of the coils B11-b12 and D11-d12 is y+1, and the upper and lower layers thereof are located at the 6th layer of the core slot;

[0046] In the first branch, 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, and the coil A5-a6 is connected to the coil A7-a8 through the twist head welding; the coil connection sequence is from the 2nd layer to the 3rd layer, from the 3rd layer to the 4th layer, from the 4th layer to the 5th layer, from the 5th layer to the 6th layer, and from the 6th layer to the 1st layer, and the same layer is walked and then returned to the 2nd layer until the 6th layer, and the cycle is repeated; the third branch is similarly connected.

[0047] In the second branch, the coil B1-b2 is connected to the coil B3-b4 through the twist head welding, the coil B1-d2 is connected to the coil B3-b4 through the twist head welding, the coil B3-b4 is connected to the coil B5-b6 through the twist head welding, and the coil B5-b6 is connected to the coil B7-b8 through the twist head welding; the coil connection sequence is from the 5th layer to the 4th layer, from the 4th layer to the 3rd layer, from the 3rd layer to the 2nd layer, from the 2nd layer to the 1st layer, and from the 1st layer to the 6th layer, and the same layer is walked and then returned to the 2nd layer until the 6th layer, and the cycle is repeated; the fourth branch is similarly connected.

[0048] As a further improvement of the present application, the neutral points of the coils are connected through copper busbars, and the height thereof does not exceed the height of the welding end of the coil.

[0049] As a further improvement of the present application, the parallel connection between the two branches in each group of winding branches is in the form of star connection or delta connection.

[0050] As a general technical concept, the present application further provides a stator comprising a stator core and the flat wire winding described above, and the stator core is provided with a plurality of core slots in the circumferential direction, and the phase winding in the flat wire winding is arranged in the core slot.

[0051] As a general technical concept, the present application further provides an electric machine comprising the stator described above.

[0052] As a general technical concept, the present application further provides a vehicle comprising the electric machine described above.

[0053] Compared with the prior art, the present application has the following advantages:

[0054] 1. The flat wire winding, the stator with the same, the motor and the vehicle of the present application adopt the winding arrangement mode of combining different span and different types of coils in four parallel branches of each group of winding branches, which reduces the wire type and non-special wire, facilitates assembly and mass production. The four branches each include coils with spans of y-1, y and y+2, a total of three different span coils are provided, and the winding directions of the four branches are the same, which are wound from the outermost slot opening to the innermost slot bottom, then from the innermost slot bottom to the outermost slot opening, and transposed by coils with different spans at the outermost slot opening; such a cycle is repeated to realize branch symmetry. By transposing the coils with different spans, the phase difference between different branches is eliminated, ensuring that each branch is symmetrical on the slot and on the layer, i.e. the four parallel branches are distributed in a ring-shaped symmetrical structure in the core slot, thereby realizing uniform and symmetrical distribution of each phase winding, balancing the potential of each branch, eliminating circulating current and harmonics, and greatly improving the performance of the motor. Further, the windings of each layer in the same core slot are of the same phase, i.e. except for the coils used for transposition, the remaining coils are winding coils with the same span, the arrangement is simple, and there is no overlap between the main bodies of each coil, the arrangement is neat, which greatly reduces the complexity of the manufacturing process and facilitates mass production.

[0055] 2、The flat wire winding, the stator with same, the motor and the vehicle of the present application, four parallel branches of each winding branch all include the coil with span y, two branches all include the coil with span y-2 and y+1, and the other two branches all include the coil with span y-1 and y+1, a total of 5 different span coils are arranged, the winding direction of adjacent branches is opposite, the winding direction of adjacent two branches is opposite, one branch is wound from the inner layer of the slot bottom to the outer layer of the slot, and then wound from the outer layer of the slot to the inner layer of the slot bottom, and transposed by different span coils at the inner layer of the slot bottom, and the other branch is wound from the outer layer of the slot to the inner layer of the slot bottom, and then wound from the inner layer of the slot to the outer layer of the slot, and transposed by different span coils at the outer layer of the slot, and the cycle is repeated to realize the symmetry of the branch. By transposing the coils with different spans, the phase difference between different branches is eliminated, and the symmetry of each branch on the slot and layer is ensured, that is, the four parallel branches are distributed in a ring-shaped symmetric structure in the core slot, thereby realizing uniform and symmetric distribution of each phase winding, balancing the potential of each branch, eliminating circulating current and harmonics, and greatly improving the performance of the motor. Further, the windings of each layer in the same core slot are of the same phase, that is, except for the coils used for transposition, the remaining coils are winding coils with the same span, the arrangement is simple, and each coil is arranged in order without overlapping between the main bodies of the coils, thereby greatly reducing the complexity of the manufacturing process and facilitating mass production. The present application not only solves a series of problems caused by the asymmetry of each branch, but also effectively reduces the difficulty of flat wire winding process and the high manufacturing cost of the motor caused by the increase of the number of phases, thereby effectively reducing the manufacturing cost of the vehicle.

[0056] 3、The flat wire winding, the stator with same, the motor and the vehicle of the present application, the neutral point of each coil is welded by a single copper busbar, and the height thereof is not more than the height of the coil welding end, which not only has a simple structure, but also reduces the height of the winding end, saves the end space, and effectively reduces the volume of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0057] Figure 1 It is a schematic diagram of the structure principle of the first coil in the present application.

[0058] Figure 2 It is a schematic diagram of the structure principle of the second coil in the present application.

[0059] Figure 3 It is a schematic diagram of the structure principle of the third coil in the present application.

[0060] Figure 4 It is a schematic diagram of the structure principle of the flat wire winding in the present application.

[0061] Figure 5 It is a schematic diagram of the structure principle of the stator in the present application.

[0062] Figure 6 This is a schematic diagram of the phase arrangement of any one phase winding in Embodiment 1 of the present invention.

[0063] Figure 7 This is a schematic diagram of the phase arrangement of any one phase winding in Embodiment 2 of the present invention.

[0064] Figure 8 This is a schematic diagram of the phase arrangement of any one phase winding in Embodiment 3 of the present invention.

[0065] 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. Copper busbar; 5. Stator core; 51. Core slot. Detailed Implementation

[0066] 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.

[0067] Example 1

[0068] like Figures 1 to 6 As shown, the flat wire winding of the present invention includes a three-phase winding, each phase winding includes multiple sets of parallel winding branches, each set of winding branches includes four parallel branches, each branch includes multiple coils arranged sequentially and connected in series on the circumferential core slots 51 of the stator core 5, and the coils between the four branches in each set of winding branches are arranged in adjacent core slots 51.

[0069] Each of the four branches includes coils with spans of y-1, y, and y+2. The winding directions of the four branches are the same, starting from the outermost layer of the slot opening (the last layer from the bottom of the slot to the opening) to the innermost layer of the slot bottom (the first layer from the bottom of the slot to the opening), and then from the innermost layer of the slot bottom to the outermost layer of the slot opening. The coils with different spans are interchanged at the outermost layer of the slot opening. This cycle is repeated to achieve branch symmetry.

[0070] Furthermore, the winding method used for the four branches is as follows: a coil with a span of y+2 is set on the outermost layer of the slot opening, and the coil with a span of y is wound from the second outermost layer of the slot opening to the second innermost layer of the slot bottom in a preset order. A coil with a span of y is set on 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 second outermost layer of the slot opening in a preset order. The coil with a span of y-1 is used to perform same-layer transposition on the outermost layer of the slot opening. This cycle is repeated to achieve branch symmetry.

[0071] In the embodiment, the four branches each include coils with a span of y-1, y and y+2, a total of three different span coils are provided, and the winding directions of the four branches are the same, that is, from the outermost slot opening to the innermost slot bottom, and then from the innermost slot bottom to the outermost slot opening, and the coils with different spans are transposed at the outermost slot opening; such a cycle is repeated to realize branch symmetry. By transposing the coils with different spans, the phase difference between different branches is eliminated, and it is ensured that each branch is symmetrical on the slot and on the layer, that is, the four parallel branches are distributed in a ring-shaped symmetrical structure in the core slot, thereby realizing uniform and symmetrical distribution of each phase winding, balancing the potential of each branch, eliminating circulating current, and canceling harmonics, which greatly improves the performance of the motor.

[0072] As shown in Figure 1 In the embodiment, the coil with a span of y 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 branch rods 111 arranged in parallel and a first head 112 connected to one end of the two first branch rods 111, and the other end of the two first branch rods 111 is provided with the 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.

[0073] As shown in Figure 2 In the embodiment, the coil with a span of y also 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 branch rods 211 arranged in parallel and a second head 212 connected to one end of the two second branch rods 211, and the other end of the two second branch rods 211 is provided with the second bending portion 22 to form a welding end, and the second bending portion 22 is bent along the width direction of the second coil body 21 and away from the second coil body 21.

[0074] As shown in Figure 3 In the embodiment, the coil with a span of y-1 and y+2 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 branch rods 311 arranged in parallel and a third head 312 connected to one end of the two third branch rods 311, and the other end of the two third branch rods 311 is provided with the third bending portion 32 to form a welding end, and the third bending portion 32 is bent along one side of the width direction of the third coil body 31. The bending directions of the first bending portion 12 and the third bending portion 32 are opposite.

[0075] In this embodiment, the heads of the first coil 1 to the third coil 3 are all 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.

[0076] In this embodiment, the parallel connection between two branches in each winding branch group is either a star connection or a delta connection.

[0077] In this embodiment, the neutral point of each coil (e.g.) Figure 6 The coils a36, b36, c36 and d36 are connected by copper busbar 4. The height of copper busbar 4 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, thereby reducing the size of the motor.

[0078] Specifically, taking a 72-slot, 8-pole motor with 4 welded terminals, 3 slots per pole per phase, and the number of coil layers increasing sequentially from the bottom to the top of the slot as an example, in this embodiment, the phase winding includes a set of winding branches. The first branch includes coils A1-a2, A3-a4, A5-a6, A7-a8, A9-a10, A11-a12, A13-a14, ..., A33-a34, A35-a36, and the second branch includes coils B1-b2, B3-b4, B5-b6, B7-b8, B9-b10, B11-b12, B13-b14, ..., B33- The third branch includes coils C1-c2, C3-c4, C5-c6, C7-c8, C9-c10, C11-c12, C13-c14, ..., C33-c34, C35-c36; the fourth branch includes coils D1-d2, D3-d4, D5-d6, D7-d8, D9-d10, D11-d12, D13-d14, ..., D33-d34, D35-d36.

[0079] The four branches all have the same winding direction and are symmetrical to each other;

[0080] The span of coils A1-a2, B1-b2, C1-c2, and D1-d2 is y+2; their upper and lower layers are both located in the 6th layer of the core slot 51.

[0081] The span of coils A3-a4, B3-b4, C3-c4, and D3-d4 is all y; their upper layers are all located in the 5th layer of the core slot 51, and their lower layers are all located in the 4th layer of the core slot 51.

[0082] The span of coils A5-a6, B5-b6, C5-c6, and D5-d6 is y; their upper layers are all located in the 3rd layer of the core slot 51, and their lower layers are all located in the 2nd layer of the core slot 51.

[0083] The span of coils A7-a8, B7-b8, C7-c8, and D7-d8 is y, and their upper and lower layers are located in the first layer of the core slot 51.

[0084] The span of coils A9-a10, B9-b10, C9-c10, and D9-d10 is y. Their upper layers are all located in the second layer of the iron core slot 51, and their lower layers are all located in the third layer of the iron core slot 51.

[0085] The span of coils A11-a12, B11-b12, C11-c12, and D11-d12 is y. Their upper layers are all located in the 4th layer of the core slot 51, and their lower layers are all located in the 5th layer of the core slot 51.

[0086] The span of coils A13-a14, B13-b14, C13-c14, and D13-d14 is y-1, and their upper and lower layers are located in the first layer of the iron core slot 51.

[0087] Coil A1-a2 is connected to coil A3-a4 by twist welding, coil A3-a4 is connected to coil A5-a6 by twist welding, coil A5-a6 is connected to coil A7-a8 by twist welding, and so on; the coil connection sequence is from layer 6, layer 5 to layer 4, layer 3 to layer 2, then to layer 1, completing the same layer in layer 1 and returning to layer 2 until layer 6, and so on; the second branch, third branch and fourth branch are similarly connected.

[0088] Specifically, coils A1-a2, B1-b2, C1-c2, and D1-d2 are all U-shaped coils with a span of 11. All four coils are located in the 6th layer of the core slot 51, and their shape is as follows: Figure 3 The third coil 3 is shown.

[0089] Coils A3-a4, A15-a16, and A27-a28 are all U-shaped coils with a span of 9. These three coils are stacked together to form the 5th and 4th layers of lapped U-shaped coils located in core slot 51, with a shape like... Figure 2 The second coil 2 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 stacked together to form the 5th and 4th layers of lapped U-shaped coils located in the core slot 51, with a shape as shown. Figure 2The second coil 2 shown. Coil C3-c4, C15-c16 and C27-c28 are all U-shaped coil with span 9, three coils are superimposed on each other, together constitute the 5th layer and the 4th layer of the core slot 51 of the U-shaped coil, shape like Figure 2 The second coil 2 shown. Coil D3-d4, D15-d16 and D27-d28 are all U-shaped coil with span 9, three coils are superimposed on each other, together constitute the 5th layer and the 4th layer of the core slot 51 of the U-shaped coil, shape like Figure 2 The second coil 2 shown.

[0090] Coil A5-a6, A17-a18 and A29-a30 are all U-shaped coil with span 9, three coils are superimposed on each other, together constitute the 3rd layer and the 2nd layer of the core slot 51 of the U-shaped coil, shape like Figure 2 The second coil 2 shown. Similarly, coil B5-b6, B17-b18 and B29-b30 are all U-shaped coil with span 9, three coils are superimposed on each other, together constitute the 3rd layer and the 2nd layer of the core slot 51 of the U-shaped coil, shape like Figure 2 The second coil 2 shown. Coil C5-c6, C17-c18 and C29-c30 are all U-shaped coil with span 9, three coils are superimposed on each other, together constitute the 3rd layer and the 2nd layer of the core slot 51 of the U-shaped coil, shape like Figure 2 The second coil 2 shown. Coil D5-d6, D17-d18 and D29-d30 are all U-shaped coil with span 9, three coils are superimposed on each other, together constitute the 3rd layer and the 2nd layer of the core slot 51 of the U-shaped coil, shape like Figure 2 The second coil 2 shown.

[0091] Coil A7-a8, A19-a20 and A31-a32 are all U-shaped coil with span 9, three coils are superimposed on each other, together constitute the 1st layer of the core slot 51 of the U-shaped coil, shape like Figure 1 The first coil 1 shown. Similarly, coil B7-b8, B19-b20 and B31-b32 are all U-shaped coil with span 9, three coils are superimposed on each other, together constitute the 1st layer of the core slot 51 of the U-shaped coil, shape like Figure 1 The first coil 1 shown. Coil C7-c8, C19-c20 and C31-c32 are all U-shaped coil with span 9, three coils are superimposed on each other, together constitute the 1st layer of the core slot 51 of the U-shaped coil, shape like Figure 1 The first coil 1 shown. Coil D7-d8, D19-d20 and D31-d32 are all U-shaped coil with span 9, three coils are superimposed on each other, together constitute the 1st layer of the core slot 51 of the U-shaped coil, shape likeFigure 1 The first coil 1 shown.

[0092] Coils A9-a10, A21-a22 and A33-a34 are all U-shaped coils with a span of 9, the three coils are superimposed on each other, together forming a superimposed U-shaped coil located in the 2nd and 3rd layers of the core slot 51, the shape is as shown in the second coil 2 shown. Figure 2 The second coil 2 shown. Similarly, coils B9-b10, B21-b22 and B33-b34 are all U-shaped coils with a span of 9, the three coils are superimposed on each other, together forming a superimposed U-shaped coil located in the 2nd and 3rd layers of the core slot 51, the shape is as shown in the second coil 2 shown. Figure 2 The second coil 2 shown. Coils C9-c10, C21-c22 and C33-c34 are all U-shaped coils with a span of 9, the three coils are superimposed on each other, together forming a superimposed U-shaped coil located in the 2nd and 3rd layers of the core slot 51, the shape is as shown in the second coil 2 shown. Figure 2 The second coil 2 shown. Coils D9-d10, D21-d22 and D33-d34 are all U-shaped coils with a span of 9, the three coils are superimposed on each other, together forming a superimposed U-shaped coil located in the 2nd and 3rd layers of the core slot 51, the shape is as shown in the second coil 2 shown. Figure 2 The second coil 2 shown.

[0093] Coils A11-a12, A23-a24 and A35-a36 are all U-shaped coils with a span of 9, the three coils are superimposed on each other, together forming a superimposed U-shaped coil located in the 4th and 5th layers of the core slot 51, the shape is as shown in the second coil 2 shown. Figure 2 The second coil 2 shown. Similarly, coils B11-b12, B23-b24 and B35-b36 are all U-shaped coils with a span of 9, the three coils are superimposed on each other, together forming a superimposed U-shaped coil located in the 4th and 5th layers of the core slot 51, the shape is as shown in the second coil 2 shown. Figure 2 The second coil 2 shown. Coils C11-c12, C23-c24 and C35-c36 are all U-shaped coils with a span of 9, the three coils are superimposed on each other, together forming a superimposed U-shaped coil located in the 4th and 5th layers of the core slot 51, the shape is as shown in the second coil 2 shown. Figure 2 The second coil 2 shown. Coils D11-d12, D23-d24 and D35-d36 are all U-shaped coils with a span of 9, the three coils are superimposed on each other, together forming a superimposed U-shaped coil located in the 4th and 5th layers of the core slot 51, the shape is as shown in the second coil 2 shown. Figure 2 The second coil 2 shown.

[0094] Coils A13-a14, B13-b14, C13-c14, D13-d14 are all U-shaped coils with a span of 8, the four coils are all located in the 6th layer of the core slot 51, the shape is as shown in the second coil 2 shown. Figure 3The third coil 3 is shown. Similarly, the coils A25-a26, B25-b26, C25-c26, and D25-d26 are all U-shaped coils with a span of 8, and the four coils are all located in the 6th layer of the core slot 51, and the shape is as shown in Figure 3 The third coil 3 is shown. The coils A13-a14, B13-b14, C13-c14, D13-d14, A25-a26, B25-b26, C25-c26, and D25-d26 located in the 1st layer are all same-layer coils of the same span to achieve the same direction of the branch winding. It can be understood that in addition to using same-layer coils for wire changing, other methods such as Bus-bar wire changing can also be used for wire changing.

[0095] In this embodiment, the four branches are all changed by different pitch coils in the outermost layer of the slot opening of the core slot 51 to eliminate the phase difference between the different branches and ensure that each branch is completely symmetrical. The motor has 12 neutral points connected by side welding copper bars, which is simple in structure and saves end space. It can be understood that in other embodiments, the outgoing ends of the branch winding can also be located in the inner circular region of the stator.

[0096] As shown in Figure 5 The embodiment also provides a stator, which comprises the stator core 5 and the flat wire winding. The inner wall of the stator core 5 is circumferentially provided with 72 core slots 51, and the phase winding in the flat wire winding is partially wound in the core slots 51 and partially located outside the core slots 51. Each core slot 51 has 6 layers of phase windings of the same phase, and the number of layers of the phase windings in each core slot 51 is the same. It can be understood that in actual application, the number of layers of each stator slot includes but is not limited to 6 layers, and can also be 2 layers or 4 layers or 8 layers, etc., and the winding mode can refer to the winding mode of the above-mentioned 6 layers.

[0097] The embodiment also provides a motor comprising the above-mentioned stator, which can be applied to electric vehicles / electric cars (EV), pure electric cars (PEV / BEV), hybrid cars (HEV), extended-range electric cars (REEV), plug-in hybrid cars (PHEV), new energy cars (New Energy Vehicle), etc.

[0098] The embodiment also provides a vehicle comprising the above-mentioned motor, which can be an electric vehicle / electric car (EV), a pure electric car (PEV / BEV), a hybrid car (HEV), an extended-range electric car (REEV), a plug-in hybrid car (PHEV), a new energy car (New Energy Vehicle), etc.

[0099] In the embodiment, by adopting the winding arrangement mode of the same span of cloth, the combination of three types of coils, the linear type is reduced, the non-special wire is reduced, the complexity of the manufacturing process is reduced, the production is facilitated, and a series of problems caused by the asymmetry of each branch can be eliminated, so that each branch can be symmetrical on the slot and on the layer, and the bus structure is simplified, the structure is compact, and the end space is saved.

[0100] Embodiment 2

[0101] As shown in Figures 1 to 5 , Figure 7 , the flat wire winding of the application includes three-phase phase windings, each phase winding includes a plurality of parallel winding branches, each winding branch includes four parallel branches, each branch includes a plurality of coils arranged in sequence on the circumferential core slot 51 of the stator core 5 and connected in series with each other, and the coils between the four branches in each winding branch are arranged in adjacent core slots 51.

[0102] The four branches each include a coil with a span of y, and the other two branches each include a coil with a span of y-2 and y+1, and the other two branches each include a coil with a span of y-1 and y+2; the winding directions of the adjacent two branches in the four branches are opposite, one of the branches is wound from the slot bottom second inner layer (the second layer from the slot bottom to the slot opening direction) to the slot opening outermost layer, then wound from the slot opening outermost layer (the last layer from the slot bottom to the slot opening direction) to the slot bottom innermost layer (the first layer from the slot bottom to the slot opening direction), and transposed at the slot bottom innermost layer through coils with different spans; the other adjacent branch is wound from the slot opening second outer layer (the second last layer from the slot bottom to the slot opening direction) to the slot bottom innermost layer, then wound from the slot bottom innermost layer to the slot opening outermost layer, and transposed at the slot opening outermost layer through coils with different spans; this cycle is repeated to achieve branch symmetry.

[0103] Further, the winding mode adopted by one of the two adjacent branches is: using a coil with a span of y to wind from the slot bottom second inner layer to the slot opening second outer layer in a predetermined sequence direction, and setting a coil with a span of y in the same layer at the slot opening outermost layer, then using a coil with a span of y to wind from the slot opening second outer layer to the slot bottom second inner layer in a predetermined sequence direction, and using a coil with a span of y-2 or y+1 to transposition in the same layer at the slot bottom innermost layer, and this cycle is repeated to achieve branch symmetry.

[0104] The winding mode adopted by the other of the two adjacent branches is: using a coil with a span of y to wind from the slot opening second outer layer to the slot bottom second inner layer in a predetermined sequence direction, and setting a coil with a span of y in the same layer at the slot bottom innermost layer, then using a coil with a span of y to wind from the slot bottom second inner layer to the slot opening second outer layer in a predetermined sequence direction, and using a coil with a span of y-1 or y+2 to transposition in the same layer at the slot opening outermost layer, and this cycle is repeated to achieve branch symmetry.

[0105] In the embodiment, the four parallel branches of each group of winding branches each include a coil with a span of y, two of the branches each further include a coil with a span of y-2 and y+1, and the other two branches each further include a coil with a span of y-1 and y+2, a total of five different span coils are provided, the winding directions of adjacent branches are opposite, the winding directions of two adjacent branches are opposite, one of the branches is wound from the inner layer of the bottom of the slot to the outer layer of the slot opening, then wound from the outer layer of the slot opening to the inner layer of the bottom of the slot, and transposed at the inner layer of the bottom of the slot by the coils with different spans; the other adjacent branch is wound from the outer layer of the slot opening to the inner layer of the bottom of the slot, then wound from the inner layer of the bottom of the slot to the outer layer of the slot opening, and transposed at the outer layer of the slot opening by the coils with different spans; the cycle is repeated to achieve branch symmetry. By transposing the coils with different spans, the phase difference between different branches is eliminated, and it is ensured that each branch is symmetrical in the slot and in the layer, that is, the four parallel branches are distributed in a ring-shaped symmetrical structure in the core slot, and that each phase winding is uniformly and symmetrically distributed, so that the potential of each branch is balanced, there is no circulating current, harmonics are cancelled, and the performance of the motor is greatly improved.

[0106] As shown in Figure 1 the embodiment, the coil with a span of y 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 branch rods 111 arranged in parallel and a first head 112 connected to one end of the two first branch rods 111, and the other end of the two first branch rods 111 is provided with the 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.

[0107] As shown in Figure 2 the 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 branch rods 211 arranged in parallel and a second head 212 connected to one end of the two second branch rods 211, and the other end of the two second branch rods 211 is provided with the second bending portion 22 to form a welding end, and the second bending portion 22 is bent along the width direction of the second coil body 21 and away from the second coil body 21.

[0108] As shown in Figure 3As shown, in this embodiment, the coils with spans of y-1, y-2, y+1, and y+2 all include 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 parallel third support rods 311 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. The third bending portion 32 bends along one side of the width direction of the third coil body 31. The bending direction of the first bending portion 12 is opposite to that of the third bending portion 32.

[0109] In this embodiment, the heads of the first coil 1 to the third coil 3 are all 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.

[0110] In this embodiment, the parallel connection between two branches in each winding branch group is either a star connection or a delta connection.

[0111] In this embodiment, the neutral point of each coil (e.g.) Figure 7 The coils a36, b36, c36 and d36 are connected by copper busbar 4. The height of copper busbar 4 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, thereby reducing the size of the motor.

[0112] Specifically, taking a 72-slot, 8-pole motor with 4 welded terminals, 3 slots per pole per phase, and the number of coil layers increasing sequentially from the bottom to the top of the slot as an example, in this embodiment, the phase winding includes a set of winding branches. The first branch includes coils A1-a2, A3-a4, A5-a6, A7-a8, A9-a10, A11-a12, A13-a14, ..., A33-a34, A35-a36, and the second branch includes coils B1-b2, B3-b4, B5-b6, B7-b8, B9-b10, B11-b12, B13-b14, ..., B33- The third branch includes coils C1-c2, C3-c4, C5-c6, C7-c8, C9-c10, C11-c12, C13-c14, ..., C33-c34, C35-c36; the fourth branch includes coils D1-d2, D3-d4, D5-d6, D7-d8, D9-d10, D11-d12, D13-d14, ..., D33-d34, D35-d36.

[0113] 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;

[0114] The span of the coils A1-a2, B1-b2, C1-c2 and D1-d2 is y; the upper layer of the coils A1-a2 and C1-c2 is located at the second layer of the core slot 51, and the lower layer is located at the third layer of the core slot 51; the upper layer of the coils B1-b2 and D1-d2 is located at the fifth layer of the core slot 51, and the lower layer is located at the fourth layer of the core slot 51;

[0115] The span of the coils A3-a4, B3-b4, C3-c4 and D3-d4 is y; the upper layer of the coils A3-a4 and C3-c4 is located at the fourth layer of the core slot 51, and the lower layer is located at the fifth layer of the core slot 51; the upper layer of the coils B3-b4 and D3-d4 is located at the third layer of the core slot 51, and the lower layer is located at the second layer of the core slot 51;

[0116] The span of the coils A5-a6, B5-b6, C5-c6 and D5-d6 is y; the upper layer and the lower layer of the coils A5-a6 and C5-c6 are located at the sixth layer of the core slot 51; the upper layer and the lower layer of the coils B5-b6 and D5-d6 are located at the first layer of the core slot 51;

[0117] The span of the coils A7-a8, B7-b8, C7-c8 and D7-d8 is y; the upper layer of the coils A7-a8 and C7-c8 is located at the fifth layer of the core slot 51, and the lower layer is located at the fourth layer of the core slot 51; the upper layer of the coils B7-b8 and D7-d8 is located at the second layer of the core slot 51, and the lower layer is located at the third layer of the core slot 51;

[0118] The span of the coils A9-a10, B9-b10, C9-c10 and D9-d10 is y; the upper layer of the coils A9-a10 and C9-c10 is located at the third layer of the core slot 51, and the lower layer is located at the second layer of the core slot 51; the upper layer of the coils B9-b10 and D9-d10 is located at the fourth layer of the core slot 51, and the lower layer is located at the fifth layer of the core slot 51;

[0119] The span of the coils A11-a12 and C11-c12 is y+1, and the upper layer and the lower layer thereof are located at the first layer of the core slot 51; the span of the coils B11-b12 and D11-d12 is y-1, and the upper layer and the lower layer thereof are located at the sixth layer of the core slot 51;

[0120] In the first branch, the coil A1-a2 is connected with the coil A3-a4 by twist head welding, the coil A3-a4 is connected with the coil A5-a6 by twist head welding, and the coil A5-a6 is connected with the coil A7-a8 by twist head welding; the coil connection sequence is from the 2nd layer to the 3rd layer, the 3rd layer to the 4th layer, then to the 5th layer, then to the 6th layer, the 6th layer, and then returning to the 5th layer until the 1st layer, and so on. The third branch is similar to the first branch.

[0121] In the second branch, the coil B1-b2 is connected with the coil B3-b4 by twist head welding, the coil B3-b4 is connected with the coil B5-b6 by twist head welding, and the coil B5-b6 is connected with the coil B7-b8 by twist head welding; the coil connection sequence is from the 5th layer to the 4th layer, the 4th layer to the 3rd layer, then to the 2nd layer, then to the 1st layer, and then returning to the 2nd layer until the 6th layer, and so on. The fourth branch is similar to the second branch.

[0122] Specifically, the coils A1-a2, A13-a14 and A25-a26 are all U-shaped coils with a span of 9, and the three coils are superimposed on each other to form the second coil 2 located in the 2nd layer and the 3rd layer of the core slot 51, as shown in the shape of Figure 2 Similarly, the coils B1-b2, B13-b14 and B25-b26 are all U-shaped coils with a span of 9, and the three coils are superimposed on each other to form the second coil 2 located in the 5th layer and the 4th layer of the core slot 51, as shown in the shape of Figure 2 The coils C1-c2, C13-c14 and C25-c26 are all U-shaped coils with a span of 9, and the three coils are superimposed on each other to form the second coil 2 located in the 2nd layer and the 3rd layer of the core slot 51, as shown in the shape of Figure 2 The coils D1-d2, D13-d14 and D25-d26 are all U-shaped coils with a span of 9, and the three coils are superimposed on each other to form the second coil 2 located in the 5th layer and the 4th layer of the core slot 51, as shown in the shape of Figure 2

[0123] The coils A3-a4, A15-a16 and A27-a28 are all U-shaped coils with a span of 9, and the three coils are superimposed on each other to form the second coil 2 located in the 4th layer and the 5th layer of the core slot 51, as shown in the shape of Figure 2 Similarly, the coils B3-b4, B15-b16 and B27-b28 are all U-shaped coils with a span of 9, and the three coils are superimposed on each other to form the second coil 2 located in the 3rd layer and the 2nd layer of the core slot 51, as shown in the shape of Figure 2 ​The second coil 2 shown. Coil C3-c4, C15-c16 and C27-c28 are all U-shaped coils with a span of 9, three coils are superimposed on each other, together constitute the 4th and 5th layer of the core slot 51 of the stacked U-shaped coil, shape like Figure 2 The second coil 2 shown. Coil D3-d4, D15-d16 and D27-d28 are all U-shaped coils with a span of 9, three coils are superimposed on each other, together constitute the 3rd and 2nd layer of the core slot 51 of the stacked U-shaped coil, shape like Figure 2 The second coil 2 shown.

[0124] Coil A5-a6, A17-a18 and A29-a30 are all U-shaped coils with a span of 9, three coils are superimposed on each other, together constitute the 6th layer of the core slot 51 of the stacked U-shaped coil, shape like Figure 1 The first coil 1 shown. Similarly, coil B5-b6, B17-b18 and B29-b30 are all U-shaped coils with a span of 9, three coils are superimposed on each other, together constitute the 1st layer of the core slot 51 of the stacked U-shaped coil, shape like Figure 1 The first coil 1 shown. Coil C5-c6, C17-c18 and C29-c30 are all U-shaped coils with a span of 9, three coils are superimposed on each other, together constitute the 6th layer of the core slot 51 of the stacked U-shaped coil, shape like Figure 1 The first coil 1 shown. Coil D5-d6, D17-d18 and D29-d30 are all U-shaped coils with a span of 9, three coils are superimposed on each other, together constitute the 1st layer of the core slot 51 of the stacked U-shaped coil, shape like Figure 1 The first coil 1 shown.

[0125] Coil A7-a8, A19-a20 and A31-a32 are all U-shaped coils with a span of 9, three coils are superimposed on each other, together constitute the 5th and 4th layer of the core slot 51 of the stacked U-shaped coil, shape like Figure 2 The second coil 2 shown. Similarly, coil B7-b8, B19-b20 and B31-b32 are all U-shaped coils with a span of 9, three coils are superimposed on each other, together constitute the 2nd and 3rd layer of the core slot 51 of the stacked U-shaped coil, shape like Figure 2 The second coil 2 shown. Coil C7-c8, C19-c20 and C31-c32 are all U-shaped coils with a span of 9, three coils are superimposed on each other, together constitute the 5th and 4th layer of the core slot 51 of the stacked U-shaped coil, shape like Figure 2 The second coil 2 shown. Coil D7-d8, D19-d20 and D31-d32 are all U-shaped coils with a span of 9, three coils are superimposed on each other, together constitute the 2nd and 3rd layer of the core slot 51 of the stacked U-shaped coil, shape likeFigure 2 The second coil 2 shown.

[0126] The coils A9-a10, A21-a22 and A33-a34 are all U-shaped coils with a span of 9, the three coils are superimposed on each other, together forming a superimposed U-shaped coil located in the 3rd layer and the 2nd layer of the core slot 51, the shape is as shown in the second coil 2. Figure 2 The second coil 2 shown. Similarly, the coils B9-b10, B21-b22 and B33-b34 are all U-shaped coils with a span of 9, the three coils are superimposed on each other, together forming a superimposed U-shaped coil located in the 4th layer and the 5th layer of the core slot 51, the shape is as shown in the second coil 2. Figure 2 The second coil 2 shown. The coils C9-c10, C21-c22 and C33-c34 are all U-shaped coils with a span of 9, the three coils are superimposed on each other, together forming a superimposed U-shaped coil located in the 3rd layer and the 2nd layer of the core slot 51, the shape is as shown in the second coil 2. Figure 2 The second coil 2 shown. The coils D9-d10, D21-d22 and D33-d34 are all U-shaped coils with a span of 9, the three coils are superimposed on each other, together forming a superimposed U-shaped coil located in the 4th layer and the 5th layer of the core slot 51, the shape is as shown in the second coil 2. Figure 2 The second coil 2 shown.

[0127] The coils A11-a12 and A35-a36 are all U-shaped coils with a span of 10, the coil A23-a24 is a U-shaped coil with a span of 7, the three coils are all located in the 1st layer of the core slot 51, the shape is as shown in the third coil 3. Figure 3 The third coil 3 shown. The coils B11-b12 and B35-b36 are all U-shaped coils with a span of 8, the coil B23-b24 is a U-shaped coil with a span of 11, the three coils are all located in the 6th layer of the core slot 51, the shape is as shown in the third coil 3. Figure 3 The third coil 3 shown. The coils C11-c12 and C35-c36 are all U-shaped coils with a span of 10, the coil C23-c24 is a U-shaped coil with a span of 7, the three coils are all located in the 1st layer of the core slot 51, the shape is as shown in the third coil 3. Figure 3 The third coil 3 shown. The coils D11-d12 and D35-d36 are all U-shaped coils with a span of 8, the coil D23-d24 is a U-shaped coil with a span of 11, the three coils are all located in the 6th layer of the core slot 51, the shape is as shown in the third coil 3. Figure 3The third coil 3 is shown. The coils A11-a12, A23-a24, A35-a36, C11-c12, C23-c24 and C35-c36 located in the first layer, and the coils B11-b12, B23-b24, B35-b36, D11-d12, D23-d24 and D35-d36 located in the sixth layer all belong to the same layer coils of different spans, so as to realize the same direction of the branch winding. It can be understood that in addition to using the same layer coil to change the line, other ways such as Bus-bar line changing can also be used.

[0128] In this embodiment, the adjacent two branches are transposed by different pitch coils at the innermost layer of the slot bottom or the outermost layer of the slot opening of the core slot 51, so as to eliminate the phase difference between different branches and ensure the complete symmetry of each branch. The motor has 12 neutral points connected by side welding copper bars, which is simple in structure. It can be understood that in other embodiments, the outgoing line end of the branch winding can also be located in the inner circular area of the stator.

[0129] It can be understood that the third branch coil C-c has the same winding form as the first branch coil A-a, and the first branch coil A-a is wound from the 2nd layer and the 11th slot of the core slot 51, and the third branch coil C-c is wound from the 2nd layer and the 47th slot of the core slot 51. The winding form of the fourth branch coil D-d is the same as that of the second branch coil B-b, and the second branch coil B-b is wound from the 5th layer and the 65th slot of the core slot 51, and the fourth branch coil D-d is wound from the 5th layer and the 29th slot of the core slot 51.

[0130] As shown in the figure, Figure 5 The embodiment also provides a stator, which comprises the stator core 5 and the flat wire winding. The inner wall of the stator core 5 is circumferentially provided with 72 core slots 51, and part of the phase winding in the flat wire winding is wound in the core slots 51, and part of the phase winding is located outside the core slots 51. Each core slot 51 has 6 layers of phase windings of the same phase, and the number of layers of the phase windings in each core slot 51 is the same. It can be understood that in actual application, the number of layers of winding of each stator slot includes but is not limited to 6 layers, and can also be 2 layers or 4 layers or 8 layers, and the winding mode can refer to the winding mode of the above-mentioned 6 layers.

[0131] The embodiment also provides a motor comprising the above-mentioned stator, which can be applied to 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), new energy vehicles (New Energy Vehicle) and the like.

[0132] The embodiment also provides a vehicle comprising the 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.

[0133] In the embodiment, the winding arrangement mode of the same span and the combination of the six types of coils is adopted, the linear type and the special wire are reduced, the manufacturing process complexity is reduced, the production is facilitated, a series of problems caused by the asymmetry of each branch can be eliminated, each branch can be symmetrical on the slot and on the layer, the bus structure is simplified, the structure is compact, and the end space is saved.

[0134] Embodiment 3

[0135] As shown in Figures 1 to 5 , Figure 8 , the flat wire winding of the application, the stator, the motor and the vehicle having the same have substantially the same structure and working principle as the flat wire winding, the stator, the motor and the vehicle having the same in the embodiment 2, and the difference lies in that: the winding mode of one of the two adjacent branches is that the coils with a span of y are wound from the inner layer of the slot bottom to the outer layer of the slot opening in a preset sequence direction, a coil with a span of y is arranged on the outermost layer of the slot opening, then the coils with a span of y are wound from the outer layer of the slot opening to the inner layer of the slot bottom in a preset sequence direction, and the coils with a span of y-1 or y+2 are used for same-layer transposition on the innermost layer of the slot bottom, and the cycle is repeated to realize the symmetry of the branch. The winding mode of the other of the two adjacent branches is that the coils with a span of y are wound from the outer layer of the slot opening to the inner layer of the slot bottom in a preset sequence direction, a coil with a span of y is arranged on the innermost layer of the slot bottom, then the coils with a span of y are wound from the inner layer of the slot bottom to the outer layer of the slot opening in a preset sequence direction, and the coils with a span of y-2 or y+1 are used for same-layer transposition on the outermost layer of the slot opening, and the cycle is repeated to realize the symmetry of the branch.

[0136] In the embodiment, the phase winding arrangement of any phase is as shown in Figure 8 , the coils A11-a12 and A23-a24 are U-shaped coils with a span of 8, the coil A35-a36 is a U-shaped coil with a span of 11, and the three coils are located on the first layer of the core slot 51 and are third coils 3 with a shape as shown in Figure 3 , the coils B11-b12 and B23-b24 are U-shaped coils with a span of 10, the coil B35-b36 is a U-shaped coil with a span of 7, and the three coils are located on the sixth layer of the core slot 51 and are third coils 3 with a shape as shown in Figure 3The third coil 3 is shown. The coils C11-c12 and C23-c24 are U-shaped coils with a span of 8, and the coil C35-c36 is a U-shaped coil with a span of 11. All three coils are located in the first layer of the core slot 51, and have a shape like Figure 3 The third coil 3 is shown. The coils D11-d12 and D23-d24 are U-shaped coils with a span of 10, and the coil D35-d36 is a U-shaped coil with a span of 7. All three coils are located in the sixth layer of the core slot 51, and have a shape like Figure 3 The third coil 3 is shown. The coils A11-a12, A23-a24, A35-a36, C11-c12, C23-c24 and C35-c36 located in the first layer, and the coils B11-b12, B23-b24, B35-b36, D11-d12, D23-d24 and D35-d36 located in the sixth layer all belong to the same layer of coils with different spans, so as to realize the same direction of winding of the branches.

[0137] The third branch coil C-c is wound in the same way as the first branch coil A-a, and the first branch coil A-a is wound from the tenth slot of the second layer of the core slot 51, and the third branch coil C-c is wound from the forty-sixth slot of the second layer of the core slot 51. The fourth branch coil D-d is wound in the same way as the second branch coil B-b, and the second branch coil B-b is wound from the sixty-fourth slot of the fifth layer of the core slot 51, and the fourth branch coil D-d is wound from the twenty-eighth slot of the fifth layer of the core slot 51.

[0138] Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art can make many possible changes and modifications to the technical solutions of the present application, or modify equivalent embodiments with equivalent changes, without departing from the spirit and technical solutions of the present application, by means of the methods and technical contents disclosed above. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solutions of the present application, all still belong to the scope of protection of the technical solutions of the present application.

Claims

1. A flat conductor winding, characterized by The three-phase phase winding comprises a plurality of parallel groups of winding branches, each group of winding branches comprising four parallel branches, each branch comprising a plurality of coils arranged in series on circumferential core slots (51) of a stator core (5), and the coils between the four branches in each group of winding branches are arranged in adjacent core slots (51); The phase winding comprises a group of winding branches, the first branch of the winding branch comprises coils A1-a2, A3-a4, A5-a6, A7-a8, A9-a10, A11-a12, A13-a14, the second branch comprises coils B1-b2, B3-b4, B5-b6, B7-b8, B9-b10, B11-b12, B13-b14, the third branch comprises coils C1-c2, C3-c4, C5-c6, C7-c8, C9-c10, C11-c12, C13-c14, and the fourth branch comprises coils D1-d2, D3-d4, D5-d6, D7-d8, D9-d10, D11-d12, D13-d14; The winding directions of the four branches are the same and symmetrical to each other; The span of the coils A1-a2, B1-b2, C1-c2, D1-d2 is y+2, and the upper and lower edge layers are located on the 6th layer of the core slot (51); The span of the coils A3-a4, B3-b4, C3-c4, D3-d4 is y, and the upper edge layer is located on the 5th layer of the core slot (51), and the lower edge layer is located on the 4th layer of the core slot (51); The span of the coils A5-a6, B5-b6, C5-c6, D5-d6 is y, and the upper edge layer is located on the 3rd layer of the core slot (51), and the lower edge layer is located on the 2nd layer of the core slot (51); The span of the coils A7-a8, B7-b8, C7-c8, D7-d8 is y, and the upper and lower edge layers are located on the 1st layer of the core slot (51); The span of the coils A9-a10, B9-b10, C9-c10, D9-d10 is y, and the upper edge layer is located on the 2nd layer of the core slot (51), and the lower edge layer is located on the 3rd layer of the core slot (51); The span of the coils A11-a12, B11-b12, C11-c12, D11-d12 is y, and the upper edge layer is located on the 4th layer of the core slot (51), and the lower edge layer is located on the 5th layer of the core slot (51); The span of the coils A13-a14, B13-b14, C13-c14, D13-d14 is y-1, and the upper and lower edge layers are located on the 1st layer of the core slot (51); The coils A1-a2 and the coils A3-a4 are connected by twist head welding, the coils A3-a4 and the coils A5-a6 are connected by twist head welding, the coils A5-a6 and the coils A7-a8 are connected by twist head welding, and so on; the coil connection sequence is from the 6th layer, the 5th layer to the 4th layer, the 3rd layer to the 2nd layer, and then to the 1st layer, and then returns to the 2nd layer to the 6th layer, and so on. The second branch, the third branch and the fourth branch are sequentially deduced; Alternatively, the phase winding comprises a set of winding branches, the first branch of the winding branches comprises coils A1-a2, A3-a4, A5-a6, A7-a8, A9-a10, A11-a12, the second branch comprises coils B1-b2, B3-b4, B5-b6, B7-b8, B9-b10, B11-b12, the third branch comprises coils C1-c2, C3-c4, C5-c6, C7-c8, C9-c10, C11-c12, and the fourth branch comprises coils D1-d2, D3-d4, D5-d6, D7-d8, D9-d10, D11-d12; 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; The span of the coils A1-a2, B1-b2, C1-c2 and D1-d2 is y; the upper edges of the coils A1-a2 and C1-c2 are located at the second layer of the core slot (51), and the lower edges are located at the third layer of the core slot (51); the upper edges of the coils B1-b2 and D1-d2 are located at the fifth layer of the core slot (51), and the lower edges are located at the fourth layer of the core slot (51); The span of the coils A3-a4, B3-b4, C3-c4 and D3-d4 is y; the upper edges of the coils A3-a4 and C3-c4 are located at the fourth layer of the core slot (51), and the lower edges are located at the fifth layer of the core slot (51); the upper edges of the coils B3-b4 and D3-d4 are located at the third layer of the core slot (51), and the lower edges are located at the second layer of the core slot (51); The span of the coils A5-a6, B5-b6, C5-c6 and D5-d6 is y; the upper and lower edges of the coils A5-a6 and C5-c6 are located at the sixth layer of the core slot (51); the upper and lower edges of the coils B5-b6 and D5-d6 are located at the first layer of the core slot (51); The span of the coils A7-a8, B7-b8, C7-c8 and D7-d8 is y, the upper edges of the coils A7-a8 and C7-c8 are located at the fifth layer of the core slot (51), and the lower edges are located at the fourth layer of the core slot (51); the upper edges of the coils B7-b8 and D7-d8 are located at the second layer of the core slot (51), and the lower edges are located at the third layer of the core slot (51); The span of the coils A9-a10, B9-b10, C9-c10 and D9-d10 is y, the upper edges of the coils A9-a10 and C9-c10 are located at the third layer of the core slot (51), and the lower edges are located at the second layer of the core slot (51); the upper edges of the coils B9-b10 and D9-d10 are located at the fourth layer of the core slot (51), and the lower edges are located at the fifth layer of the core slot (51); The span of the coils A11-a12 and C11-c12 is y+1, and the upper and lower layers are located at the first layer of the core slot (51); the span of the coils B11-b12 and D11-d12 is y-1, and the upper and lower layers are located at the sixth layer of the core slot (51); In the first branch, the coils A1-a2 and A3-a4 are connected by twist head welding, the coils A3-a4 and A5-a6 are connected by twist head welding, and the coils A5-a6 and A7-a8 are connected by twist head welding; the coil connection sequence is from the second layer to the third layer, the third layer to the fourth layer, the fourth layer to the fifth layer, the fifth layer to the sixth layer, and the sixth layer, and then returns to the fifth layer to the first layer, and so on; the third branch is similar to the first branch; In the second branch, the coils B1-b2 are connected by twist head welding, the coils B1-d2 and B3-b4 are connected by twist head welding, the coils B3-b4 and B5-b6 are connected by twist head welding, the coils B5-b6 and B7-b8 are connected by twist head welding, and the coil connection sequence is from the fifth layer to the fourth layer, the fourth layer to the third layer, the third layer to the second layer, and the second layer to the first layer, and then returns to the first layer to the sixth layer, and so on; the fourth branch is similar to the second branch; Alternatively, the phase winding includes a group of winding branches, the first branch of the winding branch includes coils A1-a2, A3-a4, A5-a6, A7-a8, A9-a10, A11-a12, the second branch includes coils B1-b2, B3-b4, B5-b6, B7-b8, B9-b10, B11-b12, the third branch includes coils C1-c2, C3-c4, C5-c6, C7-c8, C9-c10, C11-c12, and the fourth branch includes coils D1-d2, D3-d4, D5-d6, D7-d8, D9-d10, D11-d12; 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; The span of the coils A1-a2, B1-b2, C1-c2, and D1-d2 is y; the upper layers of the coils A1-a2 and C1-c2 are located at the second layer of the core slot (51), and the lower layers are located at the third layer of the core slot (51); the upper layers of the coils B1-b2 and D1-d2 are located at the fifth layer of the core slot (51), and the lower layers are located at the fourth layer of the core slot (51); The span of the coils A3-a4, B3-b4, C3-c4, and D3-d4 is y; the upper layers of the coils A3-a4 and C3-c4 are located at the fourth layer of the core slot (51), and the lower layers are located at the fifth layer of the core slot (51); the upper layers of the coils B3-b4 and D3-d4 are located at the third layer of the core slot (51), and the lower layers are located at the second layer of the core slot (51); The span of the coils A5-a6, B5-b6, C5-c6 and D5-d6 is y; the upper and lower layers of the coils A5-a6 and C5-c6 are located at the 6th layer of the core slot (51); the upper and lower layers of the coils B5-b6 and D5-d6 are located at the 1st layer of the core slot (51); The span of the coils A7-a8, B7-b8, C7-c8 and D7-d8 is y; the upper layers of the coils A7-a8 and C7-c8 are located at the 5th layer of the core slot (51), and the lower layers are located at the 4th layer of the core slot (51); the upper layers of the coils B7-b8 and D7-d8 are located at the 2nd layer of the core slot (51), and the lower layers are located at the 3rd layer of the core slot (51); The span of the coils A9-a10, B9-b10, C9-c10 and D9-d10 is y; the upper layers of the coils A9-a10 and C9-c10 are located at the 3rd layer of the core slot (51), and the lower layers are located at the 2nd layer of the core slot (51); the upper layers of the coils B9-b10 and D9-d10 are located at the 4th layer of the core slot (51), and the lower layers are located at the 5th layer of the core slot (51); The span of the coils A11-a12 and C11-c12 is y-1, and the upper and lower layers are located at the 1st layer of the core slot (51); the span of the coils B11-b12 and D11-d12 is y+1, and the upper and lower layers are located at the 6th layer of the core slot (51); In the first branch, the coil A1-a2 is connected to the coil A3-a4 by twist head welding, the coil A3-a4 is connected to the coil A5-a6 by twist head welding, and the coil A5-a6 is connected to the coil A7-a8 by twist head welding; the coil connection sequence is from the 2nd layer to the 3rd layer, from the 3rd layer to the 4th layer, from the 4th layer to the 5th layer, from the 5th layer to the 6th layer, and from the 6th layer to the 1st layer, and then returns to the 5th layer from the 6th layer, and so on; the third branch is similarly connected; In the second branch, the coil B1-b2 is connected by twist head welding, the coil B1-d2 is connected to the coil B3-b4 by twist head welding, the coil B3-b4 is connected to the coil B5-b6 by twist head welding, and the coil B5-b6 is connected to the coil B7-b8 by twist head welding; the coil connection sequence is from the 5th layer to the 4th layer, from the 4th layer to the 3rd layer, from the 3rd layer to the 2nd layer, and from the 2nd layer to the 1st layer, and then returns to the 6th layer from the 1st layer, and so on; The fourth branch is similarly connected.

2. The flat conductor winding according to claim 1, characterized in that The winding mode adopted by the four branches is as follows: a same-layer coil with a span of y+2 is arranged at the outermost layer of the slot opening, coils with a span of y are used to wind from the next outer layer of the slot opening to the next inner layer of the slot bottom in a predetermined sequence and direction, a same-layer coil with a span of y is arranged at the innermost layer of the slot bottom, coils with a span of y are used to wind from the next inner layer of the slot bottom to the next outer layer of the slot opening in a predetermined sequence and direction, and coils with a span of y-1 are used for same-layer transposition at the outermost layer of the slot opening, and so on, so as to realize the symmetry of the branch.

3. The flat conductor winding according to claim 1, characterized in that, The winding mode of one of the two adjacent branches is that the coils with a span of y are wound from the inner layer of the bottom of the slot to the outer layer of the slot opening in the preset sequence direction, and the coils with a span of y are arranged on the outermost layer of the slot opening, then the coils with a span of y are wound from the outer layer of the slot opening to the inner layer of the bottom of the slot in the preset sequence direction, and the coils with a span of y-2 or y+1 are used for transposition on the innermost layer of the bottom of the slot, and the cycle is repeated to realize the symmetry of the branch.

4. The flat conductor winding according to claim 3, characterized in that The winding mode of the other of the two adjacent branches is that the coils with a span of y are wound from the outer layer of the slot opening to the inner layer of the bottom of the slot in the preset sequence direction, and the coils with a span of y are arranged on the innermost layer of the bottom of the slot, then the coils with a span of y are wound from the inner layer of the bottom of the slot to the outer layer of the slot opening in the preset sequence direction, and the coils with a span of y-1 or y+2 are used for transposition on the outermost layer of the slot opening, and the cycle is repeated to realize the symmetry of the branch.

5. The flat conductor winding according to claim 1, characterized in that, The winding mode of one of the two adjacent branches is that the coils with a span of y are wound from the inner layer of the bottom of the slot to the outer layer of the slot opening in the preset sequence direction, and the coils with a span of y are arranged on the outermost layer of the slot opening, then the coils with a span of y are wound from the outer layer of the slot opening to the inner layer of the bottom of the slot in the preset sequence direction, and the coils with a span of y-1 or y+2 are used for transposition on the innermost layer of the bottom of the slot, and the cycle is repeated to realize the symmetry of the branch.

6. The flat conductor winding according to claim 5, characterized in that The winding mode of the other of the two adjacent branches is that the coils with a span of y are wound from the outer layer of the slot opening to the inner layer of the bottom of the slot in the preset sequence direction, and the coils with a span of y are arranged on the innermost layer of the bottom of the slot, then the coils with a span of y are wound from the inner layer of the bottom of the slot to the outer layer of the slot opening in the preset sequence direction, and the coils with a span of y-2 or y+1 are used for transposition on the outermost layer of the slot opening, and the cycle is repeated to realize the symmetry of the branch.

7. The flat conductor winding according to claim 1, characterized in that, The coil with a span of y comprises a first coil (1), 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), and the other end of the two first branch rods (111) is provided with the first bending part (12) to form a welding end, and the first bending part (12) is bent along one side of the width direction of the first coil body (11).

8. The flat conductor winding according to claim 7, characterized in that The coil with a span of y further comprises a second coil (2), 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), and the other end of the two second branch rods (211) is provided with the second bending part (22) to form a welding end, and the second bending part (22) is bent along the width direction of the second coil body (21) and away from the second coil body (21).

9. The flat conductor winding according to claim 8, characterized in that The coils of the spans y-1, y-2, y+1 and y+2 each comprise a third coil (3) comprising a third coil body (31) and a third bending portion (32), the third coil body (31) comprising two third bars (311) arranged in parallel to each other and a third head (312) connecting one end of the two third bars (311), the other end of the two third bars (311) being provided with the third bending portion (32) to form a welding end, the third bending portion (32) being bent along one side of the width direction of the third coil body (31); the bending direction of the first bending portion (12) is opposite to that of the third bending portion (32).

10. The flat conductor winding according to any one of claims 7 to 9, characterized in that The neutral points of each of the coils are connected by a copper busbar (4), the height of which is not higher than the height of the welding end of the coil.

11. A flat conductor winding according to any one of claims 1 to 9, characterized in that The parallel form between the two branch end portions of each group of winding branches is star connection or delta connection.

12. A stator characterized by, The stator core (5) is provided with a plurality of core slots (51) in the circumferential direction, and the phase winding in the flat wire winding is arranged in the core slot (51).

13. An electric machine characterized by The stator as claimed in claim 12.

14. A vehicle characterized by comprising: The motor as claimed in claim 13.

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