Flat wire stator and flat wire motor

Abstract

The invention discloses a flat wire stator and a flat wire motor, the flat wire stator comprises a stator core and a stator winding, the stator winding comprises a three-phase winding, the stator winding of each phase comprises two parallel branches, the winding directions of the two branches are opposite, each branch takes a single coil as a winding starting line and a neutral point leading-out line, and during winding, the winding directions of the two branches are opposite. The upper-layer edge and the lower-layer edge of the coil with the span of y are respectively positioned in the iron core grooves of the adjacent layers; when the branch is wound to the () th layer and the (+ 1) th layer, a coil with the span being y-1 or the span being y is adopted for winding; and when the branch is wound to the outermost layer of the notch or the innermost layer of the groove bottom, the concentric coil is formed by the coil with the span of y-1 and the coil with the span of y + 1 so as to perform same-layer commutation. The method has the advantages of few line types and simple wire insertion, and a series of problems caused by asymmetry of all branches are eliminated.

Description

Technical Field

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

[0002] 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.

[0003] Stator windings can be divided into two types: round wire and flat wire. The difference between flat wire motors and round wire motors lies in the formation of the copper wire. Flat wire is beneficial for increasing the slot fill factor of the motor. 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 with the same amount of 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 in the slots, resulting in better heat dissipation.

[0004] 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.

[0005] The wiring method of the winding structure varies depending on the number of slots and pole pairs in the flat wire winding. For example, a 54-slot, 6-pole winding typically has 3 branches. Currently, three-phase windings usually have multiple parallel branches. Due to the limitations of their winding design structure, they cannot flexibly switch between different parallel branches. Therefore, the design of existing motor stator windings is not flexible enough, has poor adaptability, and cannot arbitrarily adjust the parallel branches as needed. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a flat wire stator and flat wire motor with compact structure, simple manufacturing, symmetrical branches and neat arrangement.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A flat wire stator includes a stator core and a stator winding. The stator core has n layers of core slots, where n is a positive even number. The number of winding slots per pole and per phase of the flat wire stator is 3. The number of poles of the flat wire stator is an even multiple of 3. The number of layers formed by the stator winding in the winding slots is an even number. The stator winding includes a three-phase winding. Each phase stator winding includes two parallel branches. Each branch includes multiple interconnected coil groups. One branch of the stator winding is wound from the outermost layer of the stator core slot opening to the innermost layer of the slot bottom. The other branch is wound from the innermost layer of the slot bottom to the outermost layer of the slot opening. The coil group includes a single coil, a coil with a span of y-1, a coil with a span of y, a coil with a span of y+1, and a coil with a span of y+2. Both branches use a single coil as the winding starting line and neutral point lead. The single coil is located at the outermost layer of the slot opening or the innermost layer of the slot bottom. During winding, the upper and lower edges of the coil with a span of y are located in the adjacent core slots. When the branch is wound to the ( ) layer and ( When the +1 layer is wound, a coil with a span of y-1 or a coil with a span of y is used for winding; when the branch is wound to the outermost layer of the slot or the innermost layer of the slot bottom, a concentric coil consisting of a coil with a span of y-1 and a coil with a span of y+1 is used to perform commutation in the same layer.

[0008] As a further improvement of the present invention, when the branch is wound to the 3rd and 4th layers, a coil with a span of y-1 is used for winding; The phase winding includes a set of winding branches. The first branch in the winding branch includes a single coil A0, coils a1-A2, a3-A4, a5-A6, a7-A8, a9-A10, a11-A12, a13-A14, a15-A16, a17-A18, a19-A20, a21-A22, a23-A24, a25-A26, a27-A28, a29-A30, a31-A32, ..., a51-A5 2. Single coil a53; The second 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, ..., b51-B52, and single coil b53; Single coil A0 is located in the first layer along the bottom of the slot in the iron core groove; single coil a53 is located in the sixth layer along the bottom of the slot in the iron core groove; single coil B0 is located in the sixth layer along the bottom of the slot in the iron core groove; single coil b53 is located in the first layer along the bottom of the slot in the iron core groove. The span between A35 and A36 is y-1, and the span between b17 and B18 is y+1. The upper and lower edges of the two coils are both located in the first layer of the iron core slot, and the two coils form concentric coils. The spans of a1-A2, a3-A4, a37-A38, a39-A40, b19-B20 and b21-B22 are all 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. The spans of a5-A6, a41-A42, and b23-B24 are all y, with the upper edge located in the second layer of the iron core slot and the lower edge located in the third layer of the iron core slot. The spans of a25-A26, a27-A28, b7-B8, b9-B10, b43-B44 and b45-B46 are all y-1, 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. The span of a11-A12, a47-A48 and b29-B30 is y, and its upper edge is located in the 4th layer of the iron core slot, and its lower edge is located in the 5th layer of the iron core slot. The spans of a19-A20, a21-A22, b1-B2, b3-B4, b37-B38 and b39-B40 are all 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. The span between a17 and A18 is y+1, and the span between b35 and B36 is y-1. The upper and lower edges of the two coils are both located in the 6th layer of the iron core slot, and the two coils form concentric coils. The spans of a13-A14, a15-A16, a49-A50, a51-A52, b31-B32 and b33-B34 are all y, with the upper edge located in the 6th layer of the iron core slot and the lower edge located in the 5th layer of the iron core slot. The span of a23-A24, b5-B6 and b41-B42 is y, and its upper edge is located in the 5th layer of the iron core slot, and its lower edge is located in the 4th layer of the iron core slot. The span of a7-A8, a9-A10, a45-A46, a43-A44, b25-B26 and b27-B28 is y-1, and its upper edge is located in the 4th layer of the iron core slot, and its lower edge is located in the 3rd layer of the iron core slot. The spans of a29-A30, b11-B12, and b47-B48 are all y, with the upper edge located in the 3rd layer of the core slot and the lower edge located in the 2nd layer of the core slot. The spans of a31-A32, a33-A34, b13-B14, b15-B16, b49-B50 and b51-B52 are all 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. 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. A35-A36 are connected by copper busbars. 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. Then it goes from layer 4 to layer 3, then to layer 2, and then to layer 1, and so on, to complete the winding of the first branch. The winding of the second branch is carried out in the same way. The windings are transposed by the innermost layer of the slot opening and the outermost layer of the slot bottom coils to achieve symmetry of the three-phase windings.

[0009] As a further improvement of the present invention, when the branch is wound to the 3rd and 4th layers, a coil with a span of y is used for winding; The phase winding includes a set of winding branches. The first branch in the winding branch includes a single coil A0, coils a1-A2, a3-A4, a5-A6, a7-A8, a9-A10, a11-A12, a13-A14, a15-A16, a17-A18, a19-A20, a21-A22, a23-A24, a25-A26, a27-A28, a29-A30, a31-A32, ..., a51-A5 2. Single coil a53; The second 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, ..., b51-B52, and single coil b53; Single coil A0 is located in the first layer along the bottom of the slot in the iron core groove; single coil a53 is located in the sixth layer along the bottom of the slot in the iron core groove; single coil B0 is located in the sixth layer along the bottom of the slot in the iron core groove; single coil b53 is located in the first layer along the bottom of the slot in the iron core groove. The span between A35 and A36 is y-1, and the span between b17 and B18 is y+1. The upper and lower edges of the two coils are both located in the first layer of the iron core slot, and the two coils form concentric coils. The spans of a1-A2, a3-A4, a37-A38, a39-A40, b19-B20 and b21-B22 are all 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. The spans of a5-A6, a41-A42, and b23-B24 are all y, with the upper edge located in the second layer of the iron core slot and the lower edge located in the third layer of the iron core slot. The spans of a25-A26, a27-A28, b7-B8, b9-B10, b43-B44 and b45-B46 are all y-1, 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. The span of a11-A12, a47-A48 and b29-B30 is y, and its upper edge is located in the 4th layer of the iron core slot, and its lower edge is located in the 5th layer of the iron core slot. The spans of a19-A20, a21-A22, b1-B2, b3-B4, b37-B38 and b39-B40 are all 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. The span between a17 and A18 is y+1, and the span between b35 and B36 is y-1. The upper and lower edges of the two coils are both located in the 6th layer of the iron core slot, and the two coils form concentric coils. The spans of a13-A14, a15-A16, a49-A50, a51-A52, b31-B32 and b33-B34 are all y, with the upper edge located in the 6th layer of the iron core slot and the lower edge located in the 5th layer of the iron core slot. The span of a23-A24, b5-B6 and b41-B42 is y, and its upper edge is located in the 5th layer of the iron core slot, and its lower edge is located in the 4th layer of the iron core slot. The span of a7-A8, a9-A10, a45-A46, a43-A44, b25-B26 and b27-B28 is y-1, and its upper edge is located in the 4th layer of the iron core slot, and its lower edge is located in the 3rd layer of the iron core slot. The spans of a29-A30, b11-B12 and b47-B48 are all y, with the upper edge located in the 3rd layer of the core slot and the lower edge located in the 2nd layer of the core slot. The spans of a31-A32, a33-A34, b13-B14, b15-B16, b49-B50 and b51-B52 are all 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. 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. A35-A36 are connected by copper busbars. 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. Then it goes from layer 4 to layer 3, then to layer 2, and then to layer 1, and so on, to complete the winding of the first branch. The winding of the second branch is carried out in the same way. The windings are transposed by the innermost layer of the slot opening and the outermost layer of the slot bottom coils to achieve symmetry of the three-phase windings.

[0010] As a further improvement of the present invention, the single coil includes a first coil, the first coil includes a first coil body and a first bending portion, the first coil body includes a first support rod, the first support rod has a first head and a first bending portion at both ends, the first bending portion forms a welding end, and the bending direction of the first bending portion is opposite to the bending direction of the first head.

[0011] As a further improvement of the present invention, the single coil further includes an eighth coil, the eighth coil including an eighth coil body and an eighth bend, the eighth coil body including an eighth support rod, the eighth support rod having an eighth head and an eighth bend at both ends respectively, the eighth bend forming a welding end, the bending direction of the eighth bend being opposite to the bending direction of the eighth head, and the bending direction of the first coil being symmetrical to the bending direction of the eighth coil.

[0012] As a further improvement of the present invention, the coil with a span of y includes a second coil, a third coil, a fifth coil, and a sixth coil with the same structure. The second coil includes a second coil body and a second bending portion. The second coil body includes two second support rods arranged parallel to each other and a second head connecting one end of the two second support rods. The other end of the two second support rods is provided with a second bending portion to form a welding end. The second bending portion bends along both sides of the width direction of the second coil body.

[0013] As a further improvement of the present invention, the coil with a span of y-1 includes a fourth coil, the fourth coil includes a fourth coil body and a fourth bend, the fourth coil body includes 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 is provided with a fourth bend to form a welding end, and the fourth bend bends on both sides along the width direction of the fourth coil body.

[0014] As a further improvement of the present invention, the coil with a span of y+1 and the coil with a span of y-1 form a concentric seventh coil. The seventh coil is reversed at the outermost layer of the slot or the innermost layer of the slot bottom. The seventh coil includes a seventh coil body and a seventh bending part. The seventh coil body includes two parallel seventh support rods and a seventh head connecting one end of the two seventh support rods. The other end of the two seventh support rods is provided with a seventh bending part to form a welding end. The seventh bending part bends along one side of the width direction of the seventh coil body.

[0015] As a further improvement of the present invention, the connection form of the ends between each group of windings is a star connection or a delta connection.

[0016] As a general technical concept, the present invention also provides a flat wire motor, including the above-described flat wire stator.

[0017] Compared with the prior art, the advantages of the present invention are as follows: 1. The flat wire stator of the present invention, through the winding arrangement of different spans and different types of coils, and by adjusting the span of the third and fourth layer coils and the corresponding welding end connection, can flexibly switch between the same slot phase scheme and the same slot phase scheme as needed. By using concentric coils with different spans for wire replacement, each branch is completely symmetrical, eliminating branch current circulation. At the same time, it reduces the wire type and the complexity of the manufacturing process, making production easier. The present invention 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 caused by the increase in the number of phases of the motor, effectively reducing the vehicle manufacturing cost.

[0018] 2. The winding stator and flat wire motor of the present invention, through the different settings of the cross-layer coils and welding end connections of the third and fourth layers, can realize that the flat wire conductors in the same slot are of the same phase or different phases in the same slot, thereby realizing the adjustment of the motor's NVH performance according to different connection schemes. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structural principle of the first coil in a specific embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the structural principle of the second coil in a specific embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the structural principle of the third coil in a specific embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the structural principle of the fourth coil in a specific embodiment of the present invention.

[0023] Figure 5This is a schematic diagram of the structural principle of the fifth coil in a specific embodiment of the present invention.

[0024] Figure 6 This is a schematic diagram of the structural principle of the sixth coil in a specific embodiment of the present invention.

[0025] Figure 7 This is a schematic diagram of the structural principle of the seventh coil in a specific embodiment of the present invention.

[0026] Figure 8 This is a schematic diagram of the structural principle of the eighth coil in a specific embodiment of the present invention.

[0027] Figure 9 This is a schematic diagram of the structural principle of the stator gate end in specific embodiment 1 of the present invention.

[0028] Figure 10 This is a schematic diagram of the structural principle of the stator welding end in specific embodiment 1 of the present invention.

[0029] Figure 11 This is a schematic diagram of the phase arrangement of any one phase winding in a specific embodiment 1 of the present invention.

[0030] Figure 12 This is a schematic diagram of the structural principle of the stator gate end in specific embodiment 2 of the present invention.

[0031] Figure 13 This is a schematic diagram of the structure and principle of the stator welding end in specific embodiment 2 of the present invention.

[0032] Figure 14 This is a schematic diagram of the phase arrangement of any one phase winding in specific embodiment 2 of the present invention.

[0033] Figure 15 This is a schematic diagram of the star connection of the three-phase windings in a specific embodiment of the present invention.

[0034] Figure 16 This is a schematic diagram of the triangular connection of the three-phase windings in a specific embodiment of the present invention.

[0035] Legend: 10. Stator core; 101. Core slot; 20. Stator winding; 201. First coil; 2011. First coil body; 20111. First support rod; 20112. First head; 2012. First bend; 202. Second coil; 2021. Second coil body; 20211. Second support rod; 20212. Second head; 2022. Second bend; 203. Third coil; 2031. Third coil body; 20311. Third support rod; 20312. Third head; 2032. Third bend; 204. Fourth coil; 2041. Fourth coil body; 20411. Fourth support rod; 20412. Fourth head. ; 2042, Fourth bend; 205, Fifth coil; 2051, Fifth coil body; 20511, Fifth support rod; 20512, Fifth head; 2052, Fifth bend; 206, Sixth coil; 2061, Sixth coil body; 20611, Sixth support rod; 20612, Sixth head; 2062, Sixth bend; 207, Seventh coil; 2071, Seventh coil body; 20711, Seventh support rod; 20712, Seventh head; 2072, Seventh bend; 208, Eighth coil; 2081, Eighth coil body; 20811, Eighth support rod; 20812, Eighth head; 2082, Eighth bend; 30, Copper busbar. Detailed Implementation

[0036] 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.

[0037] Example 1 like Figures 1 to 11 As shown, the flat wire stator of this embodiment includes a stator core 10 and a stator winding 20. The stator core 10 has 6 layers of core slots 101. The number of winding slots per pole and per phase of the flat wire stator is 3. The number of poles of the flat wire stator is 6. The number of layers formed by the stator winding 20 in the winding slots is 6.

[0038] In this embodiment, the stator winding 20 includes a three-phase winding. Each phase of the stator winding 20 includes two parallel branches. Each branch includes multiple coil groups connected in series. One branch of the stator winding 20 is wound from the outermost layer of the slot opening (the first layer from the slot opening to the slot bottom) to the innermost layer of the slot bottom (the last layer from the slot opening to the slot bottom) of the stator core 10. The other branch is wound from the innermost layer of the slot bottom to the outermost layer of the slot opening of the stator core 101. The coil group includes a single coil, a coil with a span of y-1, a coil with a span of y, a coil with a span of y+1, and a coil with a span of y+2. Both branches use a single coil as the starting line for winding and the neutral point lead-out line. The single coil is located at the outermost layer of the slot opening or the innermost layer of the slot bottom. During winding, the upper and lower edges of the coil with a span of y are located in the iron core slots 101 of the adjacent layers, respectively. When the branch is wound to the 3rd and 4th layers, a coil with a span of y-1 or a coil with a span of y is used for winding. When the branch is wound to the outermost layer of the slot opening or the innermost layer of the slot bottom, a concentric coil composed of a coil with a span of y-1 and a coil with a span of y+1 is used for commutation within the same layer.

[0039] In this embodiment, different types of coils with different spans are combined in each winding branch, and the winding arrangement with different torsional spans at the torsional end achieves windings with different phases in the same slot, reducing the number of wire types and eliminating irregular wires, which facilitates assembly and mass production. A single coil is used as the lead wire at the beginning and neutral point of each winding branch, and the neutral point is connected by a busbar. The two branches in each winding branch are wound in opposite directions to achieve branch symmetry. During winding, the upper and lower edges of the coil with a span of y are located in the core slots of adjacent layers. When two branches are wound to the 3rd and 4th layers, coils with a span of y-1 or y are used for winding. When two branches are wound to the outermost layer of the slot opening or the innermost layer of the slot bottom, a concentric coil composed of a coil with a span of y-1 and a coil with a span of y+1 is used for commutation in the same layer. This helps to eliminate a series of problems caused by the asymmetry of each branch, simplifies the Busbar structure, and ensures that each branch is symmetrical in the slot and layer. That is, each parallel branch is distributed in a ring symmetrical structure in the core slot, thereby achieving a uniform and symmetrical distribution of each phase winding, resulting in balanced potential of each branch, no circulating current, and cancellation of harmonics. This achieves maximum product compatibility and greatly improves the performance of the motor. This embodiment 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 high manufacturing cost caused by the increase in the number of phases of the motor, thus effectively reducing the production cost of the vehicle.

[0040] like Figure 1As shown, in this embodiment, a single coil includes a first coil 201. The first coil 201 includes a first coil body 2011 and a first bent portion 2012. The first coil body 2011 includes a first support rod 20111. The first support rod 20111 has a first head 20112 and a first bent portion 2012 at both ends, respectively. The first bent portion 2012 forms a welding end, and the bending direction of the first bent portion 2012 is opposite to the bending direction of the first head 20112. The first coil 201 is mainly disposed in the first layer of the core slot 101.

[0041] like Figure 8 As shown, in this embodiment, the single coil also includes an eighth coil 208. The eighth coil 208 includes an eighth coil body 2081 and a first bending portion 2082. The eighth coil body 2081 includes an eighth support rod 20811, with an eighth head 20812 and a first bending portion 2082 at each end. The first bending portion 2082 forms a welding end, and the bending direction of the first bending portion 2082 is opposite to the bending direction of the eighth head 20812. Furthermore, the bending direction of the first coil 201 is symmetrical to the bending direction of the eighth coil 208. The eighth coil 208 is mainly disposed in the sixth layer of the core slot 101.

[0042] like Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, in this embodiment, the coil with a span of y includes a second coil 202, a third coil 203, a fifth coil 205, and a sixth coil 206 with identical structures. The second coil 202 includes a second coil body 2021 and a second bent portion 2022. The second coil body 2021 includes two parallel second support rods 20211 and a second head 20212 connecting one end of the two second support rods 20211. The other end of the two second support rods 20211 is provided with a second bent portion 2022 to form a welding end. The second bent portion 2022 bends along both sides of the width direction of the second coil body 2021. The second coil 202 is mainly arranged in the first and second layers of the core slot 101.

[0043] like Figure 3 As shown, the third coil 203 includes a third coil body 2031 and a third bending portion 2032. The third coil body 2031 includes two parallel third support rods 20311 and a third head 20312 connecting one end of the two third support rods 20311. The other end of the two third support rods 20311 is provided with a third bending portion 2032 to form a welding end. The third bending portion 2032 bends along both sides of the width direction of the third coil body 2031. The third coil 203 is mainly arranged in the second and third layers of the core slot 101.

[0044] like Figure 5 As shown, the fifth coil 205 includes a fifth coil body 2051 and a fifth bending portion 2052. The fifth coil body 2051 includes two parallel fifth support rods 20511 and a fifth head 20512 connecting one end of the two fifth support rods 20511. The other end of the two fifth support rods 20511 is provided with a fifth bending portion 2052 to form a welding end. The fifth bending portion 2052 bends along both sides of the width direction of the fifth coil body 2051. The fifth coil 205 is mainly arranged in the fourth and fifth layers of the core slot 101.

[0045] like Figure 6 As shown, the sixth coil 206 includes a sixth coil body 2061 and a sixth bend 2062. The sixth coil body 2061 includes two parallel sixth support rods 20611 and a sixth head 20612 connecting one end of the two sixth support rods 20611. The other end of the two sixth support rods 20611 is provided with a sixth bend 2062 to form a welding end. The sixth bend 2062 bends along both sides of the width direction of the sixth coil body 2061. The sixth coil 206 is mainly arranged in the fifth and sixth layers of the core slot 101.

[0046] like Figure 4 As shown, the span of the fourth coil 204 is also set to y-1. The fourth coil 204 is to be installed in the third and fourth layers of the core slot 101. The fourth coil 204 includes a fourth coil body 2041 and a fourth bend 204. The fourth coil body 2041 includes two parallel fourth support rods 20411 and a fourth head 20412 connecting one end of the two fourth support rods 20411. The other end of the two fourth support rods 20411 is provided with a fourth bend 2042 to form a welding end. The fourth bend 2042 bends along both sides of the width direction of the fourth coil body 2041. In other embodiments, the span of the fourth coil 204 can also be set to y.

[0047] like Figure 7 As shown, in this embodiment, a coil with a span of y+1 and a coil with a span of y-1 form a concentric seventh coil 207. The seventh coil 207 performs in-layer commutation at the outermost layer of the slot opening or the innermost layer of the slot bottom. The seventh coil 207 includes a seventh coil body 2071 and a seventh bend 2072. The seventh coil body 2071 includes two parallel seventh support rods 20711 and a seventh head 20712 connecting one end of the two seventh support rods 20711. The other end of the two seventh support rods 20711 is provided with a seventh bend 2072 to form a welding end. The seventh bend 2072 bends along one side of the width direction of the seventh coil body 2071. The seventh coil 207 is arranged in the first or sixth layer of the iron core slot 101 for in-layer commutation.

[0048] In this embodiment, by differentiating the connection settings of the cross-layer coils and welding ends in the third and fourth layers, the flat wire conductors in the same slot can be of different phases, thus enabling the adjustment of the motor's NVH performance according to different connection schemes.

[0049] In this embodiment, the heads of the second coil 202, the third coil 203, the fourth coil 204, the fifth coil 205, the sixth coil 206, and the seventh coil 207 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.

[0050] In this embodiment, the connection at the ends of each winding group is either a star connection or a delta connection, such as... Figure 15 and Figure 16 As shown.

[0051] In this embodiment, the neutral point of the coil (e.g.) Figure 11 The a53 and b53 windings are connected via a busbar, which is simple in structure and has a height that is similar to that of the welded end, reducing the height of the winding end and thus reducing the size of the motor.

[0052] Specifically, taking a 54-slot, 6-pole, 6-layer flat wire winding with 2 branches as an example, the stator gate end and welded end of the motor are respectively as follows: Figure 9 and Figure 10 As shown, the motor neutral point is connected via a busbar, resulting in a simple structure. The number of coil layers increases sequentially from the slot opening to the slot bottom. The first branch of the U-phase is Aa, and the second branch is Bb. Since there are 3 slots per pole and 2 branches per phase, to achieve branch symmetry, the first layer uses a single I-type output coil and connecting copper busbars to achieve concentric, same-layer connections and outputs with different spans. The first and second layers, the second and third layers, and the fourth and fifth layers are U-shaped coils with the same span. The third and fourth layers use U-shaped coils different from those in other layers. The sixth layer consists of concentric, same-layer U-shaped coils with different spans and I-type output coils. The two branches of the U-phase winding are represented by A and B respectively. a1-A2, a3-A4, and a5-A6 constitute U-shaped coils, and so on.

[0053] Specifically, layers 1-2, 2-3, 4-5, and 5-6 all use U-shaped coils with a span of 9, layers 3-4 use U-shaped coils with a span of 8, and layers 1 and 6 both use a combination of one U-shaped coil with a span of 8 and one U-shaped coil with a span of 10 in the same layer to form a concentric coil.

[0054] In this embodiment, 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, a31-A32, ..., a51- A52, single coil a53; the second 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, ..., b51-B52, single coil b53; Single coil A0 is located in the first layer along the bottom of the slot inside the iron core slot 101; single coil a53 is located in the sixth layer along the bottom of the slot inside the iron core slot 101; single coil B0 is located in the sixth layer along the bottom of the slot inside the iron core slot 101; single coil b53 is located in the first layer along the bottom of the slot inside the iron core slot 101; the shapes of single coil A0 and single coil b53 are as follows: Figure 1 As shown, the shapes of single coil B0 and single coil a53 are as follows: Figure 8 As shown.

[0055] The span between A35 and A36 is 8, and the span between b17 and B18 is 10. The upper and lower edges of both coils are located in the first layer of the core slot 101, and the two coils form concentric coils, with the shape as shown in the image. Figure 7 The seventh coil 207 is shown.

[0056] The spans of a1-A2, a3-A4, a37-A38, a39-A40, b19-B20, and b21-B22 are all 9. Their upper edges are located in the second layer of the core slot 101, and their lower edges are located in the first layer of the core slot 101, with a shape like... Figure 2 The second coil 202 is shown.

[0057] The spans of a5-A6, a41-A42, and b23-B24 are all 9. Their upper edges are located in the second layer of the core slot 101, and their lower edges are located in the third layer of the core slot 101, with a shape like... Figure 3 The third coil 203 is shown.

[0058] The spans of a25-A26, a27-A28, b7-B8, b9-B10, b43-B44, and b45-B46 are all 8. Their upper edges are located in the third layer of the core slot 101, and their lower edges are located in the fourth layer of the core slot 101, with shapes as follows: Figure 4 The fourth coil 204 is shown.

[0059] The spans of a11-A12, a47-A48, and b29-B30 are 9, with their upper edges located in the 4th layer of the core slot 101 and their lower edges located in the 5th layer of the core slot 101, forming a shape like... Figure 5 The fifth coil 205 is shown.

[0060] The spans of a19-A20, a21-A22, b1-B2, b3-B4, b37-B38, and b39-B40 are all 9. Their upper edges are located in the 5th layer of the core slot 101, and their lower edges are located in the 6th layer of the core slot 101, with shapes as follows: Figure 6 The sixth coil 206 is shown.

[0061] The span between a17 and A18 is 10, and the span between b35 and B36 is 8. The upper and lower edges of both coils are located in the 6th layer of the core slot 101, and the two coils form concentric coils, with the shape as shown in the image. Figure 7 The seventh coil 207 is shown.

[0062] The spans of a13-A14, a15-A16, a49-A50, a51-A52, b31-B32, and b33-B34 are all 9. Their upper edges are located in the 6th layer of the core slot 101, and their lower edges are located in the 5th layer of the core slot 101, with a shape like... Figure 6 The sixth coil 206 is shown. The spans of a23-A24, b5-B6, and b41-B42 are 9, with their upper edges located in the 5th layer of the core slot 101 and their lower edges located in the 4th layer of the core slot 101, forming a shape like... Figure 5 The fifth coil 205 is shown. The spans of a7-A8, a9-A10, a45-A46, a43-A44, b25-B26, and b27-B28 are all 8. Their upper edges are located in the 4th layer of the core slot 101, and their lower edges are located in the 3rd layer of the core slot 101, with shapes as follows: Figure 4 The fourth coil 204 is shown.

[0063] The spans of a29-A30, b11-B12, and b47-B48 are all 9. Their upper edges are located in the third layer of the core slot 101, and their lower edges are located in the second layer of the core slot 101, with a shape like... Figure 3 The third coil 203 is shown.

[0064] The spans of a31-A32, a33-A34, b13-B14, b15-B16, b49-B50, and b51-B52 are all y. Their upper edges are located in the first layer of the core slot 101, and their lower edges are located in the second layer of the core slot 101, with shapes as follows: Figure 2 The second coil 202 is shown.

[0065] 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. A35-A36 and b17-B18 are connected by copper busbar 30.

[0066] 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 then back to layer 5 after completing the same layer on layer 6. This process is repeated from layer 4 to layer 3, then to layer 2, and then back to layer 1, in a continuous cycle 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 by the innermost layer of the slot opening and the outermost layer of the slot bottom coils to achieve symmetry of the three-phase windings.

[0067] The coils are transposed using in-layer coils and bus-bars 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 use cross-layer wires, lowering manufacturing difficulty and facilitating mass production. In other embodiments, bus-bar transposition can be used for all coils.

[0068] In this embodiment, the stator winding consists of eight types of coils, such as... Figures 1 to 8 As shown. The flat wire stator and motor fully consider manufacturability. The coil consists of U-shaped coils and two types of single wires, reducing the variety of U-shaped coils, lowering manufacturing difficulty, and facilitating mass production. By transposing the windings through the innermost layer at the bottom of the slot and the outermost layer at the top of the slot, complete symmetry of the three-phase windings is ensured, reducing wire types and eliminating irregular wire shapes, greatly reducing the complexity of winding formation. Connection is only achieved through twisting at the winding welding ends, facilitating production and eliminating a series of problems caused by asymmetry in each branch. For example... Figure 15 and Figure 16 As shown, the three-phase windings can be connected in star or delta configurations via a busbar or lead wires, resulting in a compact structure.

[0069] It is understood that in practical applications, the number of winding layers in each core slot 101 is not limited to 6 layers, but can also be 2, 4, 8, or 10 layers, etc., and the winding method can refer to the above-mentioned 6-layer winding method. In other embodiments, the 3rd and 4th layers can also use short-pitch and full-pitch U-shaped coils, which are connected according to the wiring diagram with welding end twist heads, and long-pitch U-shaped coils (such as a span of 10) are connected with welding end twist heads to achieve the wiring method.

[0070] This embodiment also provides a flat wire motor including the above-described stator winding, 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.

[0071] 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.

[0072] In this embodiment, the motor consists of 8 types of coils. The windings are transposed by the innermost and outermost coils of the same layer to eliminate the phase difference between different branches and ensure that each branch is completely symmetrical.

[0073] In this embodiment, manufacturability is fully considered. The coil consists of a U-shaped coil and two types of single wires, reducing the variety of U-shaped coils. Most of the coils use multi-layer wires, which reduces manufacturing difficulty and facilitates mass production. Furthermore, the two middle layers at the welding end have different torsion angles than the other layers, thus causing the welding points to be radially offset. This increases the electrical clearance and creepage distance between adjacent layers, greatly reducing the risk of insulation failure.

[0074] Example 2 like Figures 1 to 8 , Figure 12 , Figure 13 and Figure 14 As shown, the flat wire stator in this embodiment has a similar structural configuration and working principle to the flat wire stator in Embodiment 1. The main difference is that when the branch is wound to the 3rd and 4th layers, a coil with a span of y is used for winding. That is, the span of the fourth coil is also set to y.

[0075] In this embodiment, 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, a31-A32, ..., a51- A52, single coil a53; the second 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, ..., b51-B52, single coil b53.

[0076] Single coil A0 is located in the first layer along the bottom of the slot inside the iron core slot 101; single coil a53 is located in the sixth layer along the bottom of the slot inside the iron core slot 101; single coil B0 is located in the sixth layer along the bottom of the slot inside the iron core slot 101; single coil b53 is located in the first layer along the bottom of the slot inside the iron core slot 101; the shapes of single coil A0 and single coil b53 are as follows: Figure 1 As shown, the shapes of single coil B0 and single coil a53 are as follows: Figure 8 As shown.

[0077] The span between A35 and A36 is 8, and the span between b17 and B18 is 10. The upper and lower edges of both coils are located in the first layer of the core slot 101, and the two coils form concentric coils, with the shape as shown in the image. Figure 7 The seventh coil 207 is shown.

[0078] The spans of a1-A2, a3-A4, a37-A38, a39-A40, b19-B20, and b21-B22 are all 9. Their upper edges are located in the second layer of the core slot 101, and their lower edges are located in the first layer of the core slot 101, with a shape like... Figure 2 The second coil 202 is shown.

[0079] The spans of a5-A6, a41-A42, and b23-B24 are all 9. Their upper edges are located in the second layer of the core slot 101, and their lower edges are located in the third layer of the core slot 101, with a shape like... Figure 3 The third coil 203 is shown.

[0080] The spans of a25-A26, a27-A28, b7-B8, b9-B10, b43-B44, and b45-B46 are all 9. Their upper edges are located in the 3rd layer of the core slot 101, and their lower edges are located in the 4th layer of the core slot 101, with shapes as follows: Figure 4 The fourth coil 204 is shown.

[0081] The spans of a11-A12, a47-A48, and b29-B30 are 9, with their upper edges located in the 4th layer of the core slot 101 and their lower edges located in the 5th layer of the core slot 101, forming a shape like... Figure 5 The fifth coil 205 is shown.

[0082] The spans of a19-A20, a21-A22, b1-B2, b3-B4, b37-B38, and b39-B40 are all 9. Their upper edges are located in the 5th layer of the core slot 101, and their lower edges are located in the 6th layer of the core slot 101, with shapes as follows: Figure 6 The sixth coil 206 is shown.

[0083] The span between a17 and A18 is 10, and the span between b35 and B36 is 8. The upper and lower edges of both coils are located in the 6th layer of the core slot 101, and the two coils form concentric coils, with the shape as shown in the image. Figure 7 The seventh coil 207 is shown.

[0084] The spans of a13-A14, a15-A16, a49-A50, a51-A52, b31-B32, and b33-B34 are all 9. Their upper edges are located in the 6th layer of the core slot 101, and their lower edges are located in the 5th layer of the core slot 101, with a shape like... Figure 6 The sixth coil 206 is shown.

[0085] The spans of a23-A24, b5-B6, and b41-B42 are 9, with their upper edges located in the 5th layer of the core slot 101 and their lower edges located in the 4th layer of the core slot 101, forming a shape like... Figure 5 The fifth coil 205 is shown.

[0086] The spans of a7-A8, a9-A10, a45-A46, a43-A44, b25-B26, and b27-B28 are all 9. Their upper edges are located in the 4th layer of the core slot 101, and their lower edges are located in the 3rd layer of the core slot 101, with shapes as follows: Figure 4 The fourth coil 204 is shown.

[0087] The spans of a29-A30, b11-B12, and b47-B48 are all 9. Their upper edges are located in the third layer of the core slot 101, and their lower edges are located in the second layer of the core slot 101, with a shape like... Figure 3 The third coil 203 is shown.

[0088] The spans of a31-A32, a33-A34, b13-B14, b15-B16, b49-B50, and b51-B52 are all y. Their upper edges are located in the first layer of the core slot 101, and their lower edges are located in the second layer of the core slot 101, with shapes as follows: Figure 2 The second coil 202 is shown.

[0089] 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. A35-A36 and b17-B18 are connected by copper busbar 30.

[0090] 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 then back to layer 5 after completing the same layer on layer 6. This process is repeated from layer 4 to layer 3, then to layer 2, and then back to layer 1, in a continuous cycle 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 by the innermost layer of the slot opening and the outermost layer of the slot bottom coils to achieve symmetry of the three-phase windings.

[0091] In this embodiment, by combining winding arrangements with different spans and different types of coils, and by adjusting the span of the third and fourth layer U-shaped coils and the corresponding welding end connections, flexible conversion of the same slot and same phase scheme is achieved. At the same time, the number of wire types is reduced, the complexity of the manufacturing process is reduced, production is facilitated, and a series of problems caused by the asymmetry of each branch are eliminated.

[0092] 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 flat wire stator comprising a stator core (10) and a stator winding (20), characterized in that, The stator core (10) is provided with n layers of core slots (101), n is an even positive integer, the number of winding slots of each pole and each phase of the flat wire stator is 3, the number of poles of the flat wire stator is an even multiple of 3, and the number of layers formed by the stator winding (20) in the winding slot is even; The stator winding (20) includes a three-phase winding. Each phase of the stator winding (20) includes two parallel branches. Each branch includes multiple coil groups connected in series. One branch of the stator winding (20) is wound from the outermost layer of the slot opening to the innermost layer of the slot bottom of the stator core (10). The other branch is wound from the innermost layer of the slot bottom to the outermost layer of the slot opening. The coil group includes a single coil, a coil with a span of y-1, a coil with a span of y, a coil with a span of y+1, and a coil with a span of y+2. Both branches use a single coil as the starting line and neutral point lead. The single coil is located at the outermost layer of the slot opening or the innermost layer of the slot bottom. During winding, the upper and lower edges of the coil with a span of y are located in the adjacent core slots (101). When the branch is wound to the ( ) layer and ( When the +1 layer is wound, a coil with a span of y-1 or a coil with a span of y is used for winding; when the branch is wound to the outermost layer of the slot or the innermost layer of the slot bottom, a concentric coil consisting of a coil with a span of y-1 and a coil with a span of y+1 is used to perform commutation in the same layer.

2. The flat wire stator of claim 1, wherein When the branch is wound to the 3rd layer and the 4th layer, a coil with a span of y-1 is used for winding; The phase winding includes a group of winding branches, the first branch in the winding branch includes a single coil A0, coils a1-A2, a3-A4, a5-A6, a7-A8, a9-A10, a11-A12, a13-A14, a15-A16, a17-A18, a19-A20, a21-A22, a23-A24, a25-A26, a27-A28, a29-A30, a31-A32, …, a51-A52, and a single coil a53; the second branch includes a single coil B0, coils b1-B2, b3-B4, b5-B6, b7-B8, b9-B10, b11-B12, b13-B14, b15-B16, b17-B18, b19-B20, b21-B22, b23-B24, b25-B26, b27-B28, b29-B30, b31-B32, …, b51-B52, and a single coil b53; The single coil A0 is located at the 1st layer in the slot opening along the direction of the slot bottom in the core slot (101), and the single coil a53 is located at the 6th layer in the slot opening along the direction of the slot bottom in the core slot (101); the single coil B0 is located at the 6th layer in the slot opening along the direction of the slot bottom in the core slot (101), and the single coil b53 is located at the 1st layer in the slot opening along the direction of the slot bottom in the core slot (101); The span of A35-A36 is y-1, the span of b17-B18 is y+1, the upper layer edges and the lower layer edges of the two coils are located at the 1st layer of the core slot (101), and the two coils form a concentric coil; The spans of a1-A2, a3-A4, a37-A38, a39-A40, b19-B20, and b21-B22 are all y, the upper layer edges thereof are located at the 2nd layer of the core slot (101), and the lower layer edges thereof are located at the 1st layer of the core slot (101); The spans of a5-A6, a41-A42, and b23-B24 are all y, the upper layer edges thereof are located at the 2nd layer of the core slot (101), and the lower layer edges thereof are located at the 3rd layer of the core slot (101); The spans of a25-A26, a27-A28, b7-B8, b9-B10, b43-B44, and b45-B46 are all y-1, the upper layer edges thereof are located at the 3rd layer of the core slot (101), and the lower layer edges thereof are located at the 4th layer of the core slot (101); The spans of a11-A12, a47-A48, and b29-B30 are y, the upper layer edges thereof are located at the 4th layer of the core slot (101), and the lower layer edges thereof are located at the 5th layer of the core slot (101); The span of a19-a20, a21-a22, b1-b2, b3-b4, b37-b38 and b39-b40 is y, the upper edge is located at the 5th layer of the core slot (101), and the lower edge is located at the 6th layer of the core slot (101); The span of a17-a18 is y+1, the span of b35-b36 is y-1, the upper edges and the lower edges of the two coils are located at the 6th layer of the core slot (101), and the two coils form a concentric coil; The span of a13-a14, a15-a16, a49-a50, a51-a52, b31-b32 and b33-b34 is y, the upper edge is located at the 6th layer of the core slot (101), and the lower edge is located at the 5th layer of the core slot (101); The span of a23-a24, b5-b6 and b41-b42 is y, the upper edge is located at the 5th layer of the core slot (101), and the lower edge is located at the 4th layer of the core slot (101); The span of a7-a8, a9-a10, a45-a46, a43-a44, b25-b26 and b27-b28 is y-1, the upper edge is located at the 4th layer of the core slot (101), and the lower edge is located at the 3rd layer of the core slot (101); The span of a29-a30, b11-b12 and b47-b48 is y, the upper edge is located at the 3rd layer of the core slot (101), and the lower edge is located at the 2nd layer of the core slot (101); The span of a31-a32, a33-a34, b13-b14, b15-b16, b49-b50 and b51-b52 is y, the upper edge is located at the 1st layer of the core slot (101), and the lower edge is located at the 2nd layer of the core slot (101); In the first branch, the coil A0 is connected with the coil a1-a2 through twist head welding, the coil a1-a2 is connected with the coil a3-a4 through twist head welding, the coil a3-a4 is connected with the coil a5-a6 through twist head welding, the coil a5-a6 is connected with the coil a7-a8 through twist head welding, and so on, A35-A36, b17-B18 are connected through the copper bar (30); 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 the 6th layer is completed in the same layer and returned to the 5th layer, and then to the 3rd layer, to the 2nd layer, to the 1st layer, and so on, to complete the winding of the first branch, and the winding of the second branch is sequentially similar; The winding is transposed through the innermost layer of the slot opening and the outermost layer of the slot bottom to realize the symmetry of the three-phase winding.

3. The flat wire stator of claim 2, wherein, When the branch winding is wound to the 3rd layer and the 4th layer, the coil with a span of y is wound; The phase winding comprises a set of winding branches, the first branch of the winding branches comprises 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, …, a51-A52, and single coil a53; the second branch comprises 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, …, b51-B52, and single coil b53; Single coil A0 is located at the 1st layer along the slot opening direction in the slot (101), and single coil a53 is located at the 6th layer along the slot opening direction in the slot (101); single coil B0 is located at the 6th layer along the slot opening direction in the slot (101), and single coil b53 is located at the 1st layer along the slot opening direction in the slot (101); The span of A35-A36 is y-1, the span of b17-B18 is y+1, the upper layer edges and the lower layer edges of the two coils are located at the 1st layer of the slot (101), and the two coils form a concentric coil; The spans of a1-A2, a3-A4, a37-A38, a39-A40, b19-B20 and b21-B22 are all y, the upper layer edges of which are located at the 2nd layer of the slot (101), and the lower layer edges of which are located at the 1st layer of the slot (101); The spans of a5-A6, a41-A42 and b23-B24 are all y, the upper layer edges of which are located at the 2nd layer of the slot (101), and the lower layer edges of which are located at the 3rd layer of the slot (101); The spans of a25-A26, a27-A28, b7-B8, b9-B10, b43-B44 and b45-B46 are all y-1, the upper layer edges of which are located at the 3rd layer of the slot (101), and the lower layer edges of which are located at the 4th layer of the slot (101); The spans of a11-A12, a47-A48 and b29-B30 are all y, the upper layer edges of which are located at the 4th layer of the slot (101), and the lower layer edges of which are located at the 5th layer of the slot (101); The spans of a19-A20, a21-A22, b1-B2, b3-B4, b37-B38 and b39-B40 are all y, the upper layer edges of which are located at the 5th layer of the slot (101), and the lower layer edges of which are located at the 6th layer of the slot (101); The span of a17-A18 is y+1, the span of b35-B36 is y-1, the upper layer edges and the lower layer edges of the two coils are located at the 6th layer of the slot (101), and the two coils form a concentric coil; The span of a13-a14, a15-a16, a49-a50, a51-a52, b31-b32 and b33-b34 is y, the upper layer edge is located at the 6th layer of the core slot (101), and the lower layer edge is located at the 5th layer of the core slot (101); The span of a23-a24, b5-b6 and b41-b42 is y, the upper layer edge is located at the 5th layer of the core slot (101), and the lower layer edge is located at the 4th layer of the core slot (101); The span of a7-a8, a9-a10, a45-a46, a43-a44, b25-b26 and b27-b28 is y-1, the upper layer edge is located at the 4th layer of the core slot (101), and the lower layer edge is located at the 3rd layer of the core slot (101); The span of a29-a30, b11-b12 and b47-b48 is y, the upper layer edge is located at the 3rd layer of the core slot (101), and the lower layer edge is located at the 2nd layer of the core slot (101); The span of a31-a32, a33-a34, b13-b14, b15-b16, b49-b50 and b51-b52 is y, the upper layer edge is located at the 1st layer of the core slot (101), and the lower layer edge is located at the 2nd layer of the core slot (101); In the first branch, the coil A0 is connected with the coil a1-a2 through twist head welding, the coil a1-a2 is connected with the coil a3-a4 through twist head welding, the coil a3-a4 is connected with the coil a5-a6 through twist head welding, the coil a5-a6 is connected with the coil a7-a8 through twist head welding, and so on, A35-A36, b17-B18 are connected through the copper bar (30); 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 the same layer is walked in the 6th layer and returned to the 5th layer, 4 layers to the 3rd layer, then to the 2nd layer, the 1st layer, and so on, to complete the winding of the first branch, and the winding of the second branch is sequentially similar; The winding is transposed through the same layer coil of the innermost layer of the slot and the outermost layer of the slot bottom, so as to realize the symmetry of the three-phase winding.

4. Flat wire stator according to claim 2 or 3, characterized in that The single coil comprises a first coil (201), the first coil (201) comprises a first coil body (2011) and a first bending portion (2012), the first coil body (2011) comprises a first branch rod (20111), the first branch rod (20111) is provided with a first head (20112) and a first bending portion (2012) at both ends respectively, the first bending portion (2012) forms a welding end, and the bending direction of the first bending portion (2012) is opposite to the bending direction of the first head (20112).

5. The flat wire stator of claim 4, wherein, The single coil further comprises an eighth coil (208), the eighth coil (208) comprises an eighth coil body (2081) and an eighth bending part (2082), the eighth coil body (2081) comprises an eighth supporting rod (20811), the eighth supporting rod (20811) is provided with an eighth head (20812) and the eighth bending part (2082) at two ends respectively, the eighth bending part (2082) forms a welding end, the bending direction of the eighth bending part (2082) is opposite to the bending direction of the eighth head (20812), and the bending directions of the first coil (201) and the eighth coil (208) are mutually symmetrical.

6. The flat wire stator of claim 2 or 3, wherein The coil with the span of y comprises a second coil (202), a third coil (203), a fifth coil (205) and a sixth coil (206) with the same structure, the second coil (202) comprises a second coil body (2021) and a second bending part (2022), the second coil body (2021) comprises two second supporting rods (20211) arranged in parallel and a second head (20212) connected to one end of the two second supporting rods (20211), the other end of the two second supporting rods (20211) is provided with the second bending part (2022) to form a welding end, and the second bending part (2022) is bent along both sides of the width direction of the second coil body (2021).

7. The flat wire stator of claim 2, wherein, The coil with the span of y-1 comprises a fourth coil (204), the fourth coil (204) comprises a fourth coil body (2041) and a fourth bending part (2042), the fourth coil body (2041) comprises two fourth supporting rods (20411) arranged in parallel and a fourth head (20412) connected to one end of the two fourth supporting rods (20411), the other end of the two fourth supporting rods (20411) is provided with the fourth bending part (2042) to form a welding end, and the fourth bending part (2042) is bent along both sides of the width direction of the fourth coil body (2041).

8. The flat wire stator of claim 2 or 3, wherein, The coil with the span of y+1 and the coil with the span of y-1 constitute a concentric seventh coil (207), the seventh coil (207) is reversed in the same layer at the outermost layer of the slot or the innermost layer of the slot bottom, the seventh coil (207) comprises a seventh coil body (2071) and a seventh bending part (2072), the seventh coil body (2071) comprises two seventh supporting rods (20711) arranged in parallel and a seventh head (20712) connected to one end of the two seventh supporting rods (20711), the other end of the two seventh supporting rods (20711) is provided with the seventh bending part (2072) to form a welding end, and the seventh bending part (2072) is bent along one side of the width direction of the seventh coil body (2071).

9. The flat wire stator of claim 2 or 3, wherein, The connection form of the end part between each group of windings is star connection or delta connection.

10. A flat wire motor characterized by The flat wire stator comprises the flat wire stator according to any one of claims 1 to 9.

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