CN118589737A - A 48-slot 8-pole flat wire winding stator and flat wire motor - Google Patents

Abstract

The invention discloses a 48-slot 8-pole flat wire winding stator and a flat wire motor. The winding stator comprises a three-phase winding, each phase winding comprises a plurality of groups of parallel winding branches, each group of winding branches comprises at least two branches, the branches comprise a single coil and a coil with a span of y, a single coil is arranged at the innermost layer of a slot opening as a winding start and a neutral point lead-out line, a stacked coil with a span of y is wound from the slot opening to the slot bottom, and a stacked coil with a span of y is commutated on the outermost layer of the slot bottom, then a stacked coil with a span of y is wound from the slot bottom to the slot opening, and a stacked coil with a span of y-1 is commutated on the innermost layer of the slot opening, or a concentric coil with a span of y is commutated on the outermost layer of the slot bottom, and then a stacked coil with a span of y is wound from the slot bottom to the slot opening. The invention has the advantages of compact structure, balanced electric potential of each branch, no circulating current, etc., and eliminates a series of problems caused by asymmetry of each branch.

Description

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

Technical Field

The invention belongs to the technical field of motors, and in particular relates to a 48-slot 8-pole flat wire winding stator and a flat wire motor.

Background Art

With the rapid development of new energy vehicle technology, the performance requirements of the drive motor as one of the key actuators of electric vehicles are getting higher and higher. At present, high speed, light weight and high efficiency have become the development trend of drive motors, and higher requirements are placed on the power density, high efficiency area and heat dissipation capacity of the motors.

Winding stators can be divided into round wire and flat wire. The difference between flat wire motors and round wire motors lies in the way the copper wire is formed. Flat wire is conducive to improving the slot fill rate of the motor. Generally, the slot fill rate of round wire motors is about 50%, while the slot fill rate of flat wire motors can reach more than 70%. The improvement of the slot fill rate means that more copper can be filled under the premise of unchanged space, the resistance of the motor is reduced, and the copper loss is reduced under the same current. Compared with round wire motors, the contact area between the copper conductors in the slots of flat wire motors is large, and the heat dissipation effect is better.

When the motor runs at high speed, the AC copper loss of the motor increases significantly. In order to reduce copper loss, the number of conductor layers per stator slot is generally increased, such as 4 layers, 6 layers, 8 layers, etc. Since the conductors of each parallel branch are distributed in different positions of the stator slot, if the branches are asymmetrical, there will be large differences in back electromotive force, resistance, and inductance, thus forming a circulating current, increasing additional losses and reducing efficiency, and causing local overheating of the motor winding, reducing the service life of the motor.

With the difference in the number of slots and pole pairs of the flat wire winding, the wiring method of the winding structure is also different. For example, 48 slots and 8 poles are mostly 2-branch or 4-branch schemes, 3-branch and 6-branch schemes are less or asymmetric, and due to the limitation of its winding design structure, it is impossible to achieve flexible conversion of different parallel branches. Therefore, the design method of the existing flat wire stator winding is not flexible enough, has poor adaptability, and cannot design corresponding parallel branches according to needs, which has certain limitations.

Summary of the invention

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

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

A 48-slot 8-pole flat wire winding stator, comprising a three-phase phase winding, each phase winding comprising a plurality of groups of parallel winding branches, each group of winding branches comprising at least two branches, the branches comprising a plurality of coils arranged in sequence and connected in series on the circumferential core slots of the stator core, the branches comprising a single coil and a coil with a span of y, the branches starting with a single coil located at the innermost layer of the slot opening of the core slot, using a single coil as a neutral point lead-out line at the innermost layer of the slot opening, winding a lapped coil with a span of y from the second innermost layer of the slot opening of the core slot to the outermost layer at the slot bottom, and performing same-layer commutation at the outermost layer at the slot bottom with the lapped coil with a span of y, then winding a lapped coil with a span of y from the second outermost layer at the slot bottom to the innermost layer at the slot opening, and performing same-layer commutation at the innermost layer at the slot opening with the lapped coil with a span of y-1, and so on, so as to achieve branch symmetry;

Alternatively, a concentric coil with a span of y is used for same-layer commutation at the outermost layer of the slot bottom, and then a stacked coil with a span of y is wound from the second outermost layer of the slot bottom to the innermost layer of the slot, and this cycle is repeated to achieve branch symmetry.

As a further improvement of the present invention, each group of winding branches includes three branches. In the same layer of core slots, the coils of the same branch are arranged in adjacent core slots, and the difference between two adjacent coils is the ratio of the total number of core slots to the total number of branches.

As a further improvement of the present invention, each group of winding branches includes two branches, the two branches have the same winding method, and the two branches are alternately arranged in adjacent core slots.

As a further improvement of the present invention, the stacked coil with a span of y includes a first coil, which is wound from the second inner layer of the slot to the second outer layer of the slot bottom, and includes a first coil body and a first bending portion. The first coil body includes two first support rods arranged parallel to each other and a first head connecting one end of the two first support rods, and the other ends of the two first support rods are provided with a first bending portion to form a welding end, and the first bending portion is bent along the width direction of the first coil body and away from the first coil body.

As a further improvement of the present invention, the stacked coil with a span of y also includes a second coil, which performs same-layer commutation at the outermost layer of the slot bottom, and the second coil includes a second coil body and a second bending portion, and 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, and the other ends of the two second support rods are provided with a second bending portion to form a welding end, and the second bending portion is bent on one side along the width direction of the second coil body.

As a further improvement of the present invention, the single coil includes a third coil, which is arranged in the innermost layer of the slot as a neutral point lead-out wire, and the third coil includes a third coil body and a third bending portion, and the third coil body includes a third support rod, and the third support rod has a third head and a third bending portion at both ends, respectively, and the third bending portion forms a welding end; the bending direction of the third head is opposite to the bending direction of the third bending portion.

As a further improvement of the present invention, the concentric coil with a span of y includes a fourth coil, and the fourth coil performs same-layer commutation at the outermost layer of the slot bottom. The fourth coil includes a fourth coil body and a fourth bending portion. The fourth coil body includes two fourth support rods arranged parallel to each other and a fourth head connecting one end of the two fourth support rods. The other ends of the two fourth support rods are provided with a fourth bending portion to form a welding end, and the fourth bending portion is bent on one side along the width direction of the fourth coil body.

As a further improvement of the present invention, the phase winding includes a group of winding branches, the first branch of the winding branches includes a single coil A0, coils a1-A2, a3-A4, a5-A6, a7-A8, a9-A10, a11-A12, a13-A14, a15-A16, a17-A18, a19-A20, a21-A22, a23-A24, a25-A26, a27-A28, a29-A30, and a single coil a31; the second branch of the winding branches includes a single coil B0, coils b1-B2, b3-B4, b5-B6, b7-B8, b9-B10, b11-A12, a13-A14, a15-A16, a17-A18, a19-A20, a21-A22, a23-A24, a25-A26, a27-A28, a29-A30, and a single coil a31. B12, b13-B14, b15-B16, b17-B18, b19-B20, b21-B22, b23-B24, b25-B26, b27-B28, b29-B30, single coil b31; the third branch in the winding branch includes a single coil C0, coils c1-C2, c3-C4, c5-C6, c7-C8, c9-C10, c11-C12, c13-C14, c15-C16, c17-C18, c19-C20, c21-C22, c23-C24, c25-C26, c27-C28, c29-C30, single coil c31;

The single coil A0, the single coil B0 and the single coil C0 are all located at the first layer along the slot bottom direction of the slot in the core slot, as the winding start; the single coil a31, the single coil b31 and the single coil c31 are all located at the first layer along the slot bottom direction of the slot in the core slot, as the neutral point lead wire;

The spans of a1-A2 and a17-A18 are both y, and their upper edges are located at the second layer of the core slot, and their lower edges are located at the first layer of the core slot;

The spans of a3-A4 and a19-A20 are both y, and their upper edges are located at the second layer of the core slot, and their lower edges are located at the third layer of the core slot;

The spans of a5-A6 and a21-A22 are both y, and their upper edges are located at the 4th layer of the core slot, and their lower edges are located at the 5th layer of the core slot;

The spans of a7-A8 and a23-A24 are both y, and their upper and lower edges are both located at the 6th layer of the core slot;

The spans of a9-A10 and a25-A26 are both y, and their upper edges are located at the 5th layer of the core slot, and their lower edges are located at the 4th layer of the core slot;

The spans of a11-A12 and a27-A28 are both y, and their upper edges are located at the third layer of the core slots, and their lower edges are located at the second layer of the core slots;

The spans of a13-A14 and a29-A30 are both y, and their upper edges are located at the first layer of the core slot, and their lower edges are located at the second layer of the core slot;

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

The spans of b1-B2 and b17-B18 are both y, and their upper edges are located at the second layer of the core slot, and their lower edges are located at the third layer of the core slot;

The spans of b3-B4 and b19-B20 are both y, and their upper edges are located at the 4th layer of the core slot, and their lower edges are located at the 3rd layer of the core slot;

The spans of b5-B6 and b21-B22 are both y, and their upper edges are located at the 4th layer of the core slot, and their lower edges are located at the 5th layer of the core slot;

The spans of b7-B8 and b23-B24 are both y, and their upper and lower edges are both located at the 6th layer of the core slot;

The spans of b9-B10 and b25-B26 are both y, and their upper edges are located at the 5th layer of the core slot, and their lower edges are located at the 4th layer of the core slot;

The spans of b11-B12 and b27-B28 are both y, and their upper edges are located at the third layer of the core slot, and their lower edges are located at the fourth layer of the core slot;

The spans of b13-B14 and b29-B30 are both y, and their upper edges are located at the third layer of the core slots, and their lower edges are located at the second layer of the core slots;

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

The spans of c1-C2 and c17-C18 are both y, and their upper edges are located at the second layer of the core slot, and their lower edges are located at the third layer of the core slot;

The spans of c3-C4 and c19-C20 are both y, and their upper edges are located at the 4th layer of the core slot, and their lower edges are located at the 5th layer of the core slot;

The spans of c5-C6 and c21-C22 are both y, and their upper edges are located at the 6th layer of the core slot, and their lower edges are located at the 5th layer of the core slot;

The spans of c7-C8 and c23-C24 are both y, and their upper and lower edges are both located at the 6th layer of the core slot;

The spans of c9-C10 and c25-C26 are both y, and their upper edges are located at the 5th layer of the core slot, and their lower edges are located at the 6th layer of the core slot;

The spans of c11-C12 and c27-C28 are both y, and their upper edges are located at the 5th layer of the core slot, and their lower edges are located at the 4th layer of the core slot;

The spans of c13-C14 and c29-C30 are both y, and their upper edges are located at the third layer of the core slots, and their lower edges are located at the second layer of the core slots;

The span of c15-C16 is y-1, and its upper and lower edges are both located on the first layer of the core slot.

In the first branch of the winding, coil A0 is connected to coil a1-A2 by twist welding, 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 sequence is from the 1st layer to the 2nd layer, the 2nd layer to the 3rd layer, the 3rd layer to the 4th layer, the 4th layer to the 5th layer, and then returns to the 5th layer after completing the same layer on the 6th layer, the 4th layer to the 3rd layer, and then to the 2nd layer and the 1st layer, and so on and so forth to complete the winding of the winding branch; the second branch and the third branch are similar to the first branch, and the winding is transposed by the coils of the same layer on the outermost layer of the slot bottom and the innermost layer of the slot mouth to achieve symmetry of the three-phase winding.

As a further improvement of the present invention, the phase winding includes a group of winding branches, and one of the winding branches includes a single coil A0, coils a1-A2, a3-A4, a5-A6, a7-A8, a9-A10, a11-A12, a13-A14, a15-A16, a17-A18, a19-A20, a21-A22, a23-A24, a25-A26, a27-A28, a29-A30, a31-A32, a33-A34, a35-A36, a37-A38, a39-A40, a41-A42, a43-A44, a45-A46, a47-A48, a49-A50, a51-A52, a53-A54 A44, a45-A46, a47; the other branch includes a single coil B0, coils b1-B2, b3-B4, b5-B6, b7-B8, b9-B10, b11-B12, b13-B14, b15-B16, b17-B18, b19-B20, b21-B22, b23-B24, b25-B26, b27-B28, b29-B30, b31-B32, b33-B34, b35-B36, b37-B38, b39-B40, b41-B42, b43-B44, b45-B46, b47;

The two branches have the same winding method. The single coil A0 and the single coil B0 are both located at the first layer along the slot bottom direction of the slot in the core slot, as the winding start; the single coil a47 and the single coil b47 are both located at the first layer along the slot bottom direction of the slot in the core slot, as the neutral point lead wire;

The spans of a1-A2, a3-A4, a5-A6, a40-A41, b1-B2, b3-B4, b5-B6 and b40-B41 are all y, and their upper edges are located at the second layer of the core slots, and their lower edges are located at the first layer of the core slots;

The spans of a7-A8 and b7-B8 are both y, and their upper edges are located at the second layer of the core slots, and their lower edges are located at the third layer of the core slots;

The spans of a9-A10, a11-A12, a13-A14, b9-B10, b11-B12 and b13-B14 are all y, and their upper edges are located at the 4th layer of the core slots, and their lower edges are located at the 3rd layer of the core slots;

The spans of a15-A16 and b15-B16 are both y, and their upper edges are located at the 4th layer of the core slot, and their lower edges are located at the 5th layer of the core slot;

The spans of a17-A18, a19-A20, a21-A22, b17-B18, b19-B20 and b21-B22 are all y, and their upper edges are located at the 6th layer of the core slots, and their lower edges are located at the 5th layer of the core slots;

The spans of a23-A24 and b23-B24 are both y, and their upper and lower edges are both located at the 6th layer of the core slot;

The spans of a25-A26, a27-A28, a29-A30, b25-B26, b27-B28 and b29-B30 are all y, and their upper edges are located at the 5th layer of the core slots, and their lower edges are located at the 6th layer of the core slots;

The spans of a31-A32 and b31-B32 are both y, and their upper edges are located at the 5th layer of the core slot, and their lower edges are located at the 4th layer of the core slot;

The spans of a33-A34, a35-A36, a37-A38, b33-B34, b35-B36 and b37-B38 are all y, and their upper edges are located at the third layer of the core slots, and their lower edges are located at the fourth layer of the core slots;

The spans of a39-A40 and b39-B40 are both y, and their upper edges are located at the third layer of the core slots, and their lower edges are located at the second layer of the core slots;

The spans of a41-A42, a43-A44, a45-A46, b41-B42, b43-B44 and b45-B46 are all y, and their upper edges are located at the first layer of the core slots, and their lower edges are located at the second layer of the core slots;

In the first branch, coil A0 is connected to coil a1-A2 by twist welding, 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 the 1st and 2nd layers, to the 3rd and 4th layers, and then to the 5th and 6th layers, and finally in the 6th layer, the same layer is bridged by concentric coils, and then connected to the 1st layer in sequence, and so on, to complete the winding of the first branch, and the winding of the second branch is similar; the winding is transposed through the outermost layer of the slot bottom to achieve symmetry of the three-phase winding.

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

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

1. The 48-slot 8-pole flat wire winding stator of the present invention adopts a winding arrangement method combining coils of different spans and different types in each winding branch. One line type is used to replace several coils in one layer of the phase winding, and other line types remain unchanged. The welding ends remain consistent to realize the connection scheme of different branches. The flexible conversion of different numbers of parallel branches can be realized as needed. Through the connection scheme and Busbar connection, different branch schemes such as 1, 2, 3, and 6 of the 48-slot stator can be realized, and the maximum compatibility of different branch schemes is achieved with minor changes. At the same time, the line type is reduced, the complexity of the manufacturing process is reduced, and production is facilitated. A series of problems caused by the asymmetry of each branch are eliminated, ensuring that each branch can be symmetrical in the slot and layer, that is, each parallel branch is distributed in a ring-shaped symmetrical structure in the core slot, thereby realizing the uniform and symmetrical distribution of each phase winding, so that the potential of each branch is balanced, there is no circulating current, and harmonics are offset, which greatly improves the performance of the motor. The present invention not only solves a series of problems caused by asymmetry of each branch, but also effectively reduces the difficulty of flat wire winding process and high manufacturing cost caused by the increase of phase number of the motor, thereby effectively reducing the production cost of the vehicle.

2. The winding stator and flat wire motor of the present invention realize windings compatible with different branch schemes without changing the welding end, and can realize flexible conversion of different numbers of parallel branches as needed, while reducing the manufacturing difficulty; coils with different spans are used to form a sequence-changing winding, and the positions are transposed so that each branch is completely symmetrical, avoiding the generation of circulating current and reducing the temperature rise of the motor; the flat wire conductors in the same core slot in the winding stator are of the same phase, and no phase-to-phase insulation is required between the conductors in the slot, reducing the manufacturing difficulty and the insulation cost of the motor.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of the structural principle of a first coil in a specific embodiment of the present invention.

FIG. 2 is a schematic diagram of the structural principle of the second coil in a specific embodiment of the present invention.

FIG. 3 is a schematic diagram of the structural principle of the third coil in a specific embodiment of the present invention.

FIG. 4 is a schematic diagram of the structural principle of the fourth coil in a specific embodiment of the present invention.

FIG. 5 is a schematic diagram of the structural principle of the stator gate-type end in specific embodiment 1 of the present invention.

FIG. 6 is a schematic diagram of the structural principle of the stator welding end in the specific embodiment 1 of the present invention.

FIG. 7 is a schematic diagram of the phase arrangement of any phase winding in the specific embodiment 1 of the present invention.

FIG8 is a schematic diagram of a star connection of three-phase windings in specific embodiment 1 of the present invention.

FIG. 9 is a schematic diagram of a triangle connection of three-phase windings in specific embodiment 1 of the present invention.

FIG. 10 is a schematic diagram of the structural principle of the stator gate-type end in specific embodiment 2 of the present invention.

FIG. 11 is a schematic diagram of the structural principle of the stator welding end in specific embodiment 2 of the present invention.

FIG. 12 is a schematic diagram of the phase arrangement of any phase winding in the specific embodiment 2 of the present invention.

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

FIG. 14 is a schematic diagram of a triangle connection of three-phase windings in specific embodiment 2 of the present invention.

Legend: 1. First coil; 11. First coil body; 111. First support rod; 112. First head; 12. First bending portion; 2. Second coil; 21. Second coil body; 211. Second support rod; 212. Second head; 22. Second bending portion; 3. Third coil; 31. Third coil body; 311. Third support rod; 312. Third head; 32. Third bending portion; 4. Fourth coil; 41. Fourth coil body; 411. Fourth support rod; 412. Fourth head; 42. Fourth bending portion; 5. Stator core; 51. Core slot.

DETAILED DESCRIPTION

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

Example 1

As shown in FIGS. 1 to 3 and 5 to 9, the winding stator of this embodiment includes a three-phase phase winding, each of which includes a plurality of groups of parallel winding branches, each group of winding branches includes three branches, and the branch includes a plurality of coils arranged in sequence on the circumferential core slots 51 of the stator core 5 and connected in series with each other. The branch includes a single coil and a coil with a span of y. The branch starts with a single coil located at the innermost layer of the slot opening of the core slot 51 as the winding start, and in the innermost layer of the slot opening (from the slot opening to the slot bottom), the winding ends at the innermost layer of the slot opening (from the slot opening to the slot bottom). In the embodiment of the present invention, a single coil is used as a neutral point lead-out line, and a stacked coil with a span of y is wound from the second inner layer of the slot opening of the core slot 51 to the outermost layer of the slot bottom (the last layer from the slot opening to the slot bottom), and a stacked coil with a span of y is used for same-layer commutation at the outermost layer of the slot bottom, and then a stacked coil with a span of y is wound from the second outer layer of the slot bottom to the innermost layer of the slot, and a stacked coil with a span of y-1 is used for same-layer commutation at the innermost layer of the slot, and this cycle is repeated to achieve branch symmetry.

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

As shown in Figure 1, in this embodiment, the coil with a span of y includes a first coil 1, which is wound from the second inner layer of the slot to the second outer layer of the slot bottom, and includes a first coil body 11 and a first bending portion 12. The first coil body 11 includes two first support rods 111 arranged parallel to each other and a first head 112 connecting one end of the two first support rods 111. The other ends of the two first support rods 111 are provided with a first bending portion 12 to form a welding end, and the first bending portion 12 is bent along the width direction of the first coil body 11 and away from the first coil body 11.

As shown in Figure 2, in this embodiment, the coil with a span of y also includes a second coil 2, and the second coil 2 performs same-layer commutation at the outermost layer of the slot bottom. The second coil 2 includes a second coil body 21 and a second bending portion 22. The second coil body 21 includes two second support rods 211 arranged parallel to each other and a second head 212 connecting one end of the two second support rods 211. The other ends of the two second support rods 211 are provided with a second bending portion 22 to form a welding end, and the second bending portion 22 is bent along one side of the width direction of the second coil body 21.

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

In this embodiment, the coils in each group of winding branches are wound from the inside to the outside, each coil has the same span, and the upper and lower edges of the coils are respectively located in the core slots 51 of the adjacent layers, and then the coils are transposed in the same layer through the outermost layer of the slot bottom and the innermost layer of the slot opening to eliminate the phase difference between different branches, ensuring that each branch is symmetrical in the slot and layer, that is, each parallel branch is distributed in a ring-shaped symmetrical structure in the core slot, thereby achieving uniform and symmetrical distribution of each phase winding, so that the potential of each branch is balanced, there is no circulating current, and harmonics are offset, greatly improving the performance of the motor. In addition, the flat wire conductors of the same core slot in the winding stator are of the same phase, and interphase insulation is not required between the conductors in the slot, reducing the manufacturing difficulty and the insulation cost of the motor.

In this embodiment, the heads of the first coil 1 and the second coil 2 are both 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 a U-shaped coil or a V-shaped coil. Since each coil adopts the same shape, the special-shaped coil and the cross-connected coil are eliminated, which is convenient for assembly and mass production. Of course, in other embodiments, a combination of a U-shaped coil and a V-shaped coil can also be used.

As shown in Figures 8 and 9, in this embodiment, the parallel connection between the branches in each group of winding branches is a star connection or a triangle connection. Specifically, the three-phase winding can be connected in star or triangle through a busbar or lead wire.

In this embodiment, the neutral points of the coils (such as a31, b31 and c31 in FIG. 7) are connected through Busbars, which have a simple structure and a height comparable to that of the welding ends, thereby reducing the height of the winding ends and thus reducing the size of the motor.

Specifically, taking a flat wire winding with 48 slots, 8 poles, 6 layers and 3 branches as an example, the gate end and welding end of the motor stator are shown in Figures 5 and 6 respectively. The neutral point of the motor is connected through a Busbar, and the structure is simple. The number of coil layers increases from the slot to the bottom of the slot. U-phase branch 1: A-a, branch 2: B-b, branch 3: C-c; since the number of slots per pole and per phase is 2 and the number of branches is 3, in order to achieve branch symmetry, the first layer is an I-type outlet coil, the first and second layers, the second and third layers, the third and fourth layers, the fourth and fifth layers are U-shaped coils with the same span, and the sixth layer is a U-shaped coil with the same span. The three branches of the U-phase winding are represented by A, B, and C respectively, a1-A2, a3-A4, and a5-A6 constitute a U-shaped coil, and the other branches are similar.

Specifically, the first layer uses a single lead-out coil, the 1st-2nd layer, the 2nd-3rd layer, the 3rd-4th layer, the 4th-5th layer, and the 5th-6th layer all use U-shaped coils with a span of 6, and the 6th layer uses a combination of U-shaped coils of the same layer with a span of 6.

The phase winding includes a group of winding branches, the first branch in the winding branches includes a single coil A0, coils a1-A2, a3-A4, a5-A6, a7-A8, a9-A10, a11-A12, a13-A14, a15-A16, a17-A18, a19-A20, a21-A22, a23-A24, a25-A26, a27-A28, a29-A30, and a single coil a31; the second branch in the winding branches includes a single coil B0, coils b1-B2, b3-B4, b5-B6, b7-B8, b9-B10, b11-B12, b13-B14, b 15-B16, b17-B18, b19-B20, b21-B22, b23-B24, b25-B26, b27-B28, b29-B30, a single coil b31; the third branch in the winding branch includes a single coil C0, coils c1-C2, c3-C4, c5-C6, c7-C8, c9-C10, c11-C12, c13-C14, c15-C16, c17-C18, c19-C20, c21-C22, c23-C24, c25-C26, c27-C28, c29-C30, a single coil c31; the phase winding arrangement is shown in Figure 12.

The single coil A0, the single coil B0 and the single coil C0 are all located at the first layer of the slot opening along the slot bottom direction in the core slot 51, as the winding start, and the single coil is shaped as shown in Figure 3. The single coil a31, the single coil b31 and the single coil c31 are all located at the first layer of the slot opening along the slot bottom direction in the core slot 51, as the neutral point lead wire, and the single coil is shaped as shown in Figure 3. The lead wire is led out from the gate-shaped end, and the welding end is cut flat, welded, and coated in a simple process without additional processing.

The spans of a1-A2 and a17-A18 are both 6, and their upper edges are located at the second layer of the core slot 51, and their lower edges are located at the first layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG. 1 .

The spans of a3-A4 and a19-A20 are both 6, and their upper edges are located at the second layer of the core slot 51, and their lower edges are located at the third layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG. 1 .

The spans of a5-A6 and a21-A22 are both 6, and their upper edges are located at the 4th layer of the core slot 51, and their lower edges are located at the 5th layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG. 1 .

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

The spans of a9-A10 and a25-A26 are both 6, and their upper edges are located at the 5th layer of the core slot 51, and their lower edges are located at the 4th layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG1.

The spans of a11-A12 and a27-A28 are both 6, and their upper edges are located at the third layer of the core slot 51, and their lower edges are located at the second layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG. 1 .

The spans of a13-A14 and a29-A30 are both 6, and their upper edges are located at the first layer of the core slot 51, and their lower edges are located at the second layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG. 1 .

The span of a15-A16 is 5, and the upper and lower edges thereof are both located at the first layer of the core slot 51; they are connected by copper bars or coils.

The spans of b1-B2 and b17-B18 are both 6, and their upper edges are located at the second layer of the core slot 51, and their lower edges are located at the third layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG. 1 .

The spans of b3-B4 and b19-B20 are both 6, and their upper edges are located at the 4th layer of the core slot 51, and their lower edges are located at the 3rd layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG. 1 .

The spans of b5-B6 and b21-B22 are both 6, and their upper edges are located at the 4th layer of the core slot 51, and their lower edges are located at the 5th layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG. 1 .

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

The spans of b9-B10 and b25-B26 are both 6, and their upper edges are located at the 5th layer of the core slot 51, and their lower edges are located at the 4th layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG1.

The spans of b11-B12 and b27-B28 are both 6, and their upper edges are located at the 3rd layer of the core slot 51, and their lower edges are located at the 4th layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG. 1 .

The spans of b13-B14 and b29-B30 are both 6, and their upper edges are located at the third layer of the core slot 51, and their lower edges are located at the second layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG. 1 .

The span of b15-B16 is 5, and its upper and lower edges are both located at the first layer of the core slot 51; they are connected by copper bars or coils.

The spans of c1-C2 and c17-C18 are both 6, and their upper edges are located at the second layer of the core slot 51, and their lower edges are located at the third layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG. 1 .

The spans of c3-C4 and c19-C20 are both 6, and their upper edges are located at the 4th layer of the core slot 51, and their lower edges are located at the 5th layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG1.

The spans of c5-C6 and c21-C22 are both 6, and their upper edges are located at the 6th layer of the core slot 51, and their lower edges are located at the 5th layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG1.

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

The spans of c9-C10 and c25-C26 are both 6, and their upper edges are located at the 5th layer of the core slot 51, and their lower edges are located at the 6th layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG1.

The spans of c11-C12 and c27-C28 are both 6, and their upper edges are located at the 5th layer of the core slot 51, and their lower edges are located at the 4th layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG1.

The spans of c13-C14 and c29-C30 are both 6, and their upper edges are located at the third layer of the core slot 51, and their lower edges are located at the second layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG. 1 .

The span of c15-C16 is 5, and its upper and lower edges are both located at the first layer of the core slot 51 and are connected by copper bars or coils.

In the first branch of the winding, coil A0 is connected to coil a1-A2 by twist welding, 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 sequence is from the 1st layer to the 2nd layer, the 2nd layer to the 3rd layer, the 3rd layer to the 4th layer, the 4th layer to the 5th layer, and then returns to the 5th layer after completing the same layer on the 6th layer, the 4th layer to the 3rd layer, and then to the 2nd layer and the 1st layer, and so on and so forth to complete the winding of the winding branch; the second branch and the third branch are similar to the first branch, and the winding is transposed by the coils of the same layer on the outermost layer of the slot bottom and the innermost layer of the slot mouth to achieve symmetry of the three-phase winding.

In this embodiment, the coils are transposed by coils on the same layer to eliminate the phase difference between different branches and ensure that each branch is completely symmetrical. In this embodiment, manufacturability is fully considered. The coils are composed of U-shaped coils and single wires, which reduces the types of U-shaped coils. Most of them use cross-layer wires, which reduces the manufacturing difficulty and facilitates mass production. In other embodiments, bus-bar wire replacement can also be used.

In this embodiment, the winding stator is composed of three types of coils, as shown in Figures 1 to 3. The flat wire stator and the motor fully consider the manufacturability, and the coil is composed of a U-shaped coil and a single wire, which reduces the types of U-shaped coils, reduces the difficulty of manufacturing, and is convenient for mass production; the winding is transposed by the innermost and outermost same-layer coils, ensuring that the three-phase winding is completely symmetrical, reducing the line type and no special-shaped wire, greatly reducing the complexity of the winding molding, and only through the winding welding end twist connection processing, it is convenient for production, and can eliminate a series of problems caused by the asymmetry of each branch, and the three-phase winding can be connected in star and triangle through Busbar or lead wire, and the structure is compact.

As shown in FIG. 5 and FIG. 6 , this embodiment further provides a stator, which includes a stator core 5 and the above-mentioned winding stator. The inner wall of the stator core 5 is provided with 48 core slots 51 in the circumferential direction. Part of the phase winding in the winding stator 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 practical applications, the number of winding layers of each stator slot includes but is not limited to 6 layers, and can also be 2 layers, 4 layers, 8 layers, etc., and its winding method can refer to the above-mentioned 6-layer winding method.

This embodiment also provides a flat wire motor including the above winding 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), etc. In the flat wire wave-wound motor of this embodiment, the wave-wound flat wire does not need to be welded, has no welding points, and has high design flexibility, reduces the processing steps of the flat wire wave-wound motor, simplifies the process, and reduces the cost.

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

In this embodiment, the motor is composed of three 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.

Example 2

As shown in Figures 1 and 3, 4, 10 to 14, the winding stator of this embodiment has a similar structural arrangement and working principle to the winding stator in Example 1. The two identical coils of the 6th layer with a span of 6 in Example 1 are replaced by concentric coils of the same layer with a span, and other line types and welding ends remain unchanged. By rearranging the coils and changing the number of each line type, it can be transformed into a flat wire winding with 48 slots, 6 layers, 8 poles and 2 branches.

Specifically, the winding stator includes a three-phase phase winding, each phase winding includes a plurality of groups of parallel winding branches, each group of winding branches includes two branches, the branch includes a plurality of coils arranged in sequence and connected in series on the circumferential core slots 51 of the stator core 5, the branch includes a single coil and a coil with a span of y, the branch starts with a single coil located at the innermost layer of the slot of the core slot 51 as the winding start, and a single coil is used as a neutral point lead-out line in the innermost layer of the slot (the first layer from the slot to the slot bottom), and a stacked coil with a span of y is wound from the second innermost layer of the slot of the core slot 51 to the outermost layer of the slot bottom (the last layer from the slot to the slot bottom), and a concentric coil with a span of y is used to perform same-layer commutation at the outermost layer of the slot bottom, and then a stacked coil with a span of y is wound from the second outermost layer of the slot bottom to the innermost layer of the slot, and this cycle is repeated to achieve branch symmetry.

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

As shown in Figure 4, in this embodiment, the concentric coil with a span of y includes a fourth coil 4, and the fourth coil 4 performs same-layer commutation at the outermost layer of the slot bottom. The fourth coil 4 includes a fourth coil body 41 and a fourth bending portion 42. The fourth coil body 41 includes two fourth support rods 411 arranged parallel to each other and a fourth head 412 connecting one end of the two fourth support rods 411. The other ends of the two fourth support rods 411 are provided with a fourth bending portion 42 to form a welding end, and the fourth bending portion 42 is bent along one side of the width direction of the fourth coil body 41.

As shown in Figures 13 and 14, in this embodiment, the parallel connection between the branches in each group of winding branches is a star connection or a triangle connection. Specifically, the three-phase winding can be connected in star or triangle through a busbar or lead wire.

Specifically, taking a flat wire winding with 48 slots, 8 poles, 6 layers and 2 branches as an example, the gate end and welding end of the motor stator are shown in Figures 10 and 11 respectively. The neutral point of the motor is connected through a Busbar, and the structure is simple. The number of coil layers increases from the slot to the bottom of the slot. U-phase branch: A-a, B-b, since the number of slots per pole and per phase is 2, the number of branches is 2. In order to achieve branch symmetry, the first layer uses a single lead-out coil, the 1st-2nd layer, the 2nd-3rd layer, the 3rd-4th layer, the 4th-5th layer, and the 5th-6th layer all use U-shaped coils with a span of 6, and the 6th layer uses concentric U-shaped coils with the same layer and a span of 6. The U-phase winding branch is represented by A, a1-A2, a3-A4, a5-A6 constitute a U-shaped coil, represented by B, b1-B2, b3-B4, b5-B6 constitute a U-shaped coil, and so on.

The phase winding includes a group of winding branches, and one of the winding branches includes a single coil A0, coils a1-A2, a3-A4, a5-A6, a7-A8, a9-A10, a11-A12, a13-A14, a15-A16, a17-A18, a19-A20, a21-A22, a23-A24, a25-A26, a27-A28, a29-A30, a31-A32, a33-A34, a35-A36, a37-A38, a39-A40, a41-A42, a43-A44, a45-A46, a47-A48 47; the other branch includes a single coil B0, coils b1-B2, b3-B4, b5-B6, b7-B8, b9-B10, b11-B12, b13-B14, b15-B16, b17-B18, b19-B20, b21-B22, b23-B24, b25-B26, b27-B28, b29-B30, b31-B32, b33-B34, b35-B36, b37-B38, b39-B40, b41-B42, b43-B44, b45-B46, b47; the phase winding arrangement is shown in Figure 12.

The two branches have the same winding method, and the single coil A0 and the single coil B0 are both located in the first layer of the slot opening along the slot bottom direction of the core slot 51, as the winding start, and the shape is a single coil as shown in Figure 3. The single coil a47 and the single coil b47 are both located in the first layer of the slot opening along the slot bottom direction of the core slot 51, as the neutral point lead wire; the lead wire is led out from the gate-shaped end, and the welding end is cut flat, welded, and coated in a simple process without additional processing.

The spans of a1-A2, a3-A4, a5-A6, a40-A41, b1-B2, b3-B4, b5-B6 and b40-B41 are all 6, and their upper edges are located at the second layer of the core slot 51, and their lower edges are located at the first layer of the core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

The spans of a7-A8 and b7-B8 are both 6, and their upper edges are located at the second layer of the core slot 51, and their lower edges are located at the third layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG. 1 .

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

The spans of a15-A16 and b15-B16 are both 6, and their upper edges are located at the 4th layer of the core slot 51, and their lower edges are located at the 5th layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG. 1 .

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

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

The spans of a25-A26, a27-A28, a29-A30, b25-B26, b27-B28 and b29-B30 are all 6, and their upper edges are located at the 5th layer of the core slot 51, and their lower edges are located at the 6th layer of the core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

The spans of a31-A32 and b31-B32 are both 6, and their upper edges are located at the 5th layer of the core slot 51, and their lower edges are located at the 4th layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG. 1 .

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

The spans of a39-A40 and b39-B40 are both 6, and their upper edges are located at the third layer of the core slot 51, and their lower edges are located at the second layer of the core slot 51; the shape is a stacked U-shaped coil as shown in FIG. 1 .

The spans of a41-A42, a43-A44, a45-A46, b41-B42, b43-B44 and b45-B46 are all 6, and their upper edges are located at the first layer of the core slot 51, and their lower edges are located at the second layer of the core slot 51; the shape is a stacked U-shaped coil as shown in Figure 1.

In the first branch, coil A0 is connected to coil a1-A2 by twist welding, 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 the 1st and 2nd layers, to the 3rd and 4th layers, and then to the 5th and 6th layers, and finally in the 6th layer, the same layer is bridged by concentric coils, and then connected to the 1st layer in sequence, and so on, to complete the winding of the first branch, and the winding of the second branch is similar; the winding is transposed through the outermost layer of the slot bottom to achieve symmetry of the three-phase winding. In this embodiment, under the condition that the welding end remains unchanged, a winding compatible with different branch schemes is realized, and the number of parallel branches can be flexibly converted as needed, while reducing the manufacturing difficulty.

Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention through the methods and technical contents disclosed above without departing from the spirit and technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims (10)

1. The 48-slot 8-pole flat wire winding stator is characterized by comprising three-phase windings, wherein each phase winding comprises a plurality of groups of winding branches connected in parallel, each group of winding branches at least comprises two branches, each branch comprises a plurality of coils which are sequentially arranged on a circumferential iron core slot (51) of a stator iron core (5) and are connected in series, each branch comprises a single coil and a coil with a span of y, the branches are started by taking the single coil positioned at the innermost layer of a slot opening of the iron core slot (51) as winding, the innermost layer of the slot opening utilizes the single coil as a neutral point outgoing line, the lap winding coil with the span of y is wound from the inner layer of the slot opening of the iron core slot (51) to the outermost layer of the slot bottom, the lap winding coil with the span of y is subjected to the same-layer commutation at the outermost layer of the slot bottom, the lap winding coil with the span of y is wound from the outer layer of the slot bottom to the innermost layer, and the lap winding coil with the span of y-1 is subjected to the same-layer commutation at the innermost layer of the slot opening, and the lap winding is circulated so as to realize symmetry of the branches;

Or the concentric coil with the span of y is used for carrying out the same-layer reversing on the outermost layer of the groove bottom, and the lap winding coil with the span of y is used for winding from the secondary outer layer of the groove bottom to the innermost layer of the groove opening, so that the circulation is carried out, and the branch symmetry is realized.

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

3. The 48-slot 8-pole flat wire winding stator according to claim 1, wherein each set of winding branches comprises two branches having the same winding pattern, the two branches being alternately arranged in adjacent core slots (51).

4. The 48-slot 8-pole flat wire winding stator according to claim 1, wherein the lap winding coil with the span of y comprises a first coil (1), the first coil (1) is wound from a notch secondary inner layer to a slot bottom secondary outer layer, the first coil (1) comprises a first coil main body (11) and a first bending part (12), the first coil main body (11) comprises two first struts (111) which are arranged in parallel with each other and a first head part (112) which is connected with one end of the two first struts (111), the other end of the two first struts (111) is provided with the first bending part (12) to form a welding end, and the first bending part (12) is bent along the width direction of the first coil main body (11) and is far away from the direction of the first coil main body (11).

5. The 48-slot 8-pole flat wire winding stator according to claim 1, wherein the lap winding with the span y further comprises a second coil (2), the second coil (2) performs the same-layer commutation on the outermost layer of the slot bottom, the second coil (2) comprises a second coil main body (21) and a second bending part (22), the second coil main body (21) comprises two second struts (211) which are arranged in parallel with each other and a second head part (212) which is connected with one end of the two second struts (211), the other ends of the two second struts (211) are provided with second bending parts (22) to form welding ends, and the second bending parts (22) are bent along one side of the width direction of the second coil main body (21).

6. The 48-slot 8-pole flat wire winding stator according to claim 1, wherein the single coil comprises a third coil (3), the third coil (3) is arranged at the innermost layer of the slot as a neutral point outgoing line, the third coil (3) comprises a third coil main body (31) and a third bending part (32), the third coil main body (31) comprises a third supporting rod (311), two ends of the third supporting rod (311) are respectively provided with a third head part (312) and a third bending part (32), and the third bending part (32) forms a welding end; the bending direction of the third head part (312) is opposite to the bending direction of the third bending part (32).

7. The 48-slot 8-pole flat wire winding stator according to claim 1, wherein the concentric coil of span y comprises a fourth coil (4), the fourth coil (4) being commutated in the same layer at the outermost layer of the slot bottom, the fourth coil (4) comprising a fourth coil body (41) and a fourth bent portion (42), the fourth coil body (41) comprising two fourth struts (411) arranged parallel to each other and a fourth head (412) connecting one ends of the two fourth struts (411), the other ends of the two fourth struts (411) being provided with a fourth bent portion (42) to form a welded end, the fourth bent portion (42) being bent along one side in the width direction of the fourth coil body (41).

8. The 48-slot 8-pole flat wire winding stator of claim 2, wherein said phase winding comprises a set of winding branches, a first one of the winding branches comprising a single coil A0, coil a1-A2、a3-A4、a5-A6、a7-A8、a9-A10、a11-A12、a13-A14、a15-A16、a17-A18、a19-A20、a21-A22、a23-A24、a25-A26、a27-A28、a29-A30、, a single coil a31; the second branch in the winding branches comprises a single coil B0 and a single coil B31 of a coil 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、; the third branch in the winding branch comprises a single coil C0 and a single coil C31 of a coil c1-C2、c3-C4、c5-C6、c7-C8、c9-C10、c11-C12、c13-C14、c15-C16、c17-C18、c19-C20、c21-C22、c23-C24、c25-C26、c27-C28、c29-C30、;

The single coil A0, the single coil B0 and the single coil C0 are all positioned on the 1 st layer of the notch in the iron core groove (51) along the groove bottom direction and serve as winding starting; the single coil a31, the single coil b31 and the single coil c31 are all positioned on the 1 st layer of the notch in the iron core groove (51) along the groove bottom direction and serve as neutral point outgoing lines;

The spans of A1-A2 and a17-A18 are y, the upper layer side of the span is positioned on the 2 nd layer of the iron core slot (51), and the lower layer side of the span is positioned on the 1 st layer of the iron core slot (51);

the spans of a3-A4 and a19-A20 are y, the upper layer side of the span is positioned on the 2 nd layer of the iron core slot (51), and the lower layer side of the span is positioned on the 3 rd layer of the iron core slot (51);

the spans of a5-A6 and a21-A22 are y, the upper layer side of the span is positioned on the 4 th layer of the iron core slot (51), and the lower layer side of the span is positioned on the 5 th layer of the iron core slot (51);

The spans of a7-A8 and a23-A24 are y, and the upper layer side and the lower layer side of the three are positioned on the 6 th layer of the iron core slot (51);

the spans of a9-A10 and a25-A26 are y, the upper layer side of the span is positioned on the 5 th layer of the iron core slot (51), and the lower layer side of the span is positioned on the 4 th layer of the iron core slot (51);

the spans of a11-A12 and a27-A28 are y, the upper layer side of the span is positioned on the 3 rd layer of the iron core slot (51), and the lower layer side of the span is positioned on the 2 nd layer of the iron core slot (51);

The spans of a13-A14 and a29-A30 are y, the upper layer side of the span is positioned on the 1 st layer of the iron core slot (51), and the lower layer side of the span is positioned on the 2 nd layer of the iron core slot (51);

the span of a15-A16 is y-1, and the upper layer side and the lower layer side of the span are both positioned on the 1 st layer of the iron core slot (51);

The spans of B1-B2 and B17-B18 are y, the upper layer side of the span is positioned on the 2 nd layer of the iron core slot (51), and the lower layer side of the span is positioned on the 3 rd layer of the iron core slot (51);

The spans of B3-B4 and B19-B20 are y, the upper layer side of the span is positioned on the 4 th layer of the iron core slot (51), and the lower layer side of the span is positioned on the 3 rd layer of the iron core slot (51);

the spans of B5-B6 and B21-B22 are y, the upper layer side of the span is positioned on the 4 th layer of the iron core slot (51), and the lower layer side of the span is positioned on the 5 th layer of the iron core slot (51);

The spans of B7-B8 and B23-B24 are y, and the upper layer side and the lower layer side are positioned on the 6 th layer of the iron core slot (51);

the spans of B9-B10 and B25-B26 are y, the upper layer side of the span is positioned on the 5 th layer of the iron core slot (51), and the lower layer side of the span is positioned on the 4 th layer of the iron core slot (51);

the spans of B11-B12 and B27-B28 are y, the upper layer side of the span is positioned at the 3 rd layer of the iron core slot (51), and the lower layer side of the span is positioned at the 4 th layer of the iron core slot (51);

The spans of B13-B14 and B29-B30 are y, the upper layer side of the span is positioned on the 3 rd layer of the iron core slot (51), and the lower layer side of the span is positioned on the 2 nd layer of the iron core slot (51);

the span of B15-B16 is y-1, and the upper layer side and the lower layer side are both positioned on the 1 st layer of the iron core slot (51);

The spans of C1-C2 and C17-C18 are y, the upper layer side of the span is positioned on the 2 nd layer of the iron core slot (51), and the lower layer side of the span is positioned on the 3 rd layer of the iron core slot (51);

The spans of C3-C4 and C19-C20 are y, the upper layer side of the span is positioned on the 4 th layer of the iron core slot (51), and the lower layer side of the span is positioned on the 5 th layer of the iron core slot (51);

The spans of C5-C6 and C21-C22 are y, the upper layer side of the span is positioned on the 6 th layer of the iron core slot (51), and the lower layer side of the span is positioned on the 5 th layer of the iron core slot (51);

the spans of C7-C8 and C23-C24 are y, and the upper layer side and the lower layer side are positioned on the 6 th layer of the iron core slot (51);

The spans of C9-C10 and C25-C26 are y, the upper layer side of the span is positioned on the 5 th layer of the iron core slot (51), and the lower layer side of the span is positioned on the 6 th layer of the iron core slot (51);

the spans of C11-C12 and C27-C28 are y, the upper layer side of the span is positioned on the 5 th layer of the iron core slot (51), and the lower layer side of the span is positioned on the 4 th layer of the iron core slot (51);

the spans of C13-C14 and C29-C30 are y, the upper layer side of the span is positioned at the 3 rd layer of the iron core slot (51), and the lower layer side of the span is positioned at the 2 nd layer of the iron core slot (51);

the span of C15-C16 is y-1, and the upper layer side and the lower layer side are both positioned on the 1 st layer of the iron core slot (51);

In the first branch of the winding, the coil A0 is connected with the coils a1-A2 through the twist head welding, the coils a1-A2 are connected with the coils a3-A4 through the twist head welding, the coils a3-A4 are connected with the coils a5-A6 through the twist head welding, the coils a5-A6 are connected with the coils a7-A8 through the twist head welding, and so on; the coil sequentially passes through the layers 1 to 2,2 to 3 and 3 to 4, 4 to 5, the same layer is finished at the layer 6, then the coil returns to the layer 5, the coil returns to the layer 3, then the coil returns to the layer 2 and the layer 1, and the coil is circularly reciprocated in such a way to complete the winding of the winding branch; the second branch and the third branch are similar to the first branch, and the windings are transposed through the same-layer coils at the outermost layer of the groove bottom and the innermost layer of the groove opening so as to realize the symmetry of the three-phase windings.

9. A 48-slot 8-pole flat wire winding stator as claimed in claim 3 wherein the phase winding comprises a set of winding branches, one of the winding branches comprising a single coil A0, the other branch comprising a single coil B0, coil a1-A2、a3-A4、a5-A6、a7-A8、a9-A10、a11-A12、a13-A14、a15-A16、a17-A18、a19-A20、a21-A22、a23-A24、a25-A26、a27-A28、a29-A30、a31-A32、a33-A34、a35-A36、a37-A38、a39-A40、a41-A42、a43-A44、a45-A46、a47; b1-B2、b3-B4、b5-B6、b7-B8、b9-B10、b11-B12、b13-B14、b15-B16、b17-B18、b19-B20、b21-B22、b23-B24、b25-B26、b27-B28、b29-B30、b31-B32、b33-B34、b35-B36、b37-B38、b39-B40、b41-B42、b43-B44、b45-B46、b47;

The two branches have the same winding mode, and a single coil A0 and a single coil B0 are both positioned on the 1 st layer of the notch in the iron core groove (51) along the groove bottom direction and serve as winding starting points; the single coil a47 and the single coil b47 are both positioned on the 1 st layer of the notch in the iron core groove (51) along the groove bottom direction and serve as neutral point outgoing lines;

The spans of a1-A2, a3-A4, a5-A6, a40-A41, B1-B2, B3-B4, B5-B6 and B40-B41 are all y, the upper layer side is positioned on the 2 nd layer of the iron core slot (51), and the lower layer side is positioned on the 1 st layer of the iron core slot (51);

the spans of a7-A8 and B7-B8 are y, the upper layer side of the span is positioned on the 2 nd layer of the iron core slot (51), and the lower layer side of the span is positioned on the 3 rd layer of the iron core slot (51);

The spans of a9-A10, a11-A12, a13-A14, B9-B10, B11-B12 and B13-B14 are all y, the upper layer side is positioned on the 4 th layer of the iron core slot (51), and the lower layer side is positioned on the 3 rd layer of the iron core slot (51);

The spans of a15-A16 and B15-B16 are y, the upper layer side of the span is positioned on the 4 th layer of the iron core slot (51), and the lower layer side of the span is positioned on the 5 th layer of the iron core slot (51);

The spans of a17-A18, a19-A20, a21-A22, B17-B18, B19-B20 and B21-B22 are all y, the upper layer side is positioned on the 6 th layer of the iron core slot (51), and the lower layer side is positioned on the 5 th layer of the iron core slot (51);

The spans of a23-A24 and B23-B24 are y, and the upper layer side and the lower layer side of the span are positioned on the 6 th layer of the iron core slot (51);

The spans of a25-A26, a27-A28, a29-A30, B25-B26, B27-B28 and B29-B30 are all y, the upper layer side is positioned on the 5 th layer of the iron core slot (51), and the lower layer side is positioned on the 6 th layer of the iron core slot (51);

the spans of a31-A32 and B31-B32 are y, the upper layer side of the span is positioned on the 5 th layer of the iron core slot (51), and the lower layer side of the span is positioned on the 4 th layer of the iron core slot (51);

The spans of a33-A34, a35-A36, a37-A38, B33-B34, B35-B36 and B37-B38 are all y, the upper layer side is positioned at the 3 rd layer of the iron core slot (51), and the lower layer side is positioned at the 4 th layer of the iron core slot (51);

The spans of a39-A40 and B39-B40 are y, the upper layer side of the span is positioned on the 3 rd layer of the iron core slot (51), and the lower layer side of the span is positioned on the 2 nd layer of the iron core slot (51);

The spans of a41-A42, a43-A44, a45-A46, B41-B42, B43-B44 and B45-B46 are all y, the upper layer side is positioned on the 1 st layer of the iron core slot (51), and the lower layer side is positioned on the 2 nd layer of the iron core slot (51);

In the first branch, the coil A0 is connected with the coils a1-A2 through the torsion welding, the coils a1-A2 are connected with the coils a3-A4 through the torsion welding, the coils a3-A4 are connected with the coils a5-A6 through the torsion welding, the coils a5-A6 are connected with the coils a7-A8 through the torsion welding, and so on; the coil connection sequence is from layer 1 and layer 2, transition to layer 3 and layer 4, and then transition to layer 5 and layer 6, realize the same layer bridging through concentric coil at layer 6 finally, connect to layer 1 sequentially again, so cycle is reciprocated, in order to finish the coiling of the first branch, the coiling of the second branch is analogized sequentially; the windings are transposed through the outermost layer of the tank bottom so as to realize the symmetry of the three-phase windings.

10. A flat wire electric machine comprising a 48-slot 8-pole flat wire winding stator as claimed in any one of claims 1 to 9.