Flat wire motor, power assembly and electric vehicle

Abstract

The utility model provides a flat wire motor, a power assembly and an electric vehicle. The stator of the flat wire motor comprises a stator core, and the stator core comprises a plurality of winding slots. A plurality of flat wires are exposed out of one end of the stator core in the axial direction of the stator core and are arranged in a layered mode in the radial direction of the stator core. The multiple layers of flat wires in the radial direction of the stator core comprise two adjacent layers of flat wires, and each layer of flat wires in the two layers of flat wires comprises multiple groups of flat wires. Each group of flat wires comprises two flat wires, one ends of the two flat wires are welded along the radial direction of the stator iron core, and the other ends of the two flat wires are respectively inserted into different winding slots. And an arc-shaped filler is arranged between the two layers of flat wires along the radial direction of the stator core. The length of the arc-shaped filler in the circumferential direction of the stator core is larger than the length of any flat wire in the circumferential direction of the stator core and larger than the height of the arc-shaped filler in the axial direction of the stator core. In the application, the arc-shaped filler can be used for limiting the movement of the two-layer flat wire, so that the mechanical vibration impact resistance of the two-layer flat wire is improved.

Description

Technical Field

[0001] This application relates to the technical field of motors, and particularly to a flat wire motor, a powertrain, and an electric vehicle. Background Art

[0002] A motor includes a motor winding. Currently, flat wire windings are widely used in the motors of new energy vehicles. For performance considerations, a multi-slot multi-layer winding scheme is adopted, and the wire diameter of the flat wire in the motor winding shows a trend of getting smaller and smaller. The flat wire with a small wire diameter has poor rigidity and is not sufficient to resist the vibration and impact during the operation of the motor, resulting in fatigue durability failure of the flat wire solder joints. Summary of the Utility Model

[0003] This application provides a flat wire motor, a powertrain, and an electric vehicle.

[0004] In a first aspect, this application provides a flat wire motor. The stator of the flat wire motor includes a stator core, and the stator core includes a plurality of winding slots. The plurality of winding slots are arranged at intervals along the circumferential direction of the stator core, and each winding slot penetrates the stator core along the axial direction of the stator core. At one end of the stator core along the axial direction of the stator core, a plurality of flat wires are exposed. The plurality of flat wires are arranged in layers along the radial direction of the stator core. Along the radial direction of the stator core, the multi-layer flat wires include two adjacent layers of flat wires. Each layer of flat wires in the two layers of flat wires includes a plurality of groups of flat wires arranged along the circumferential direction of the stator core. Each group of flat wires includes two flat wires. One ends of the two flat wires are welded along the radial direction of the stator core, and the other ends of the two flat wires are respectively used to be inserted into different winding slots. An arc-shaped filler is arranged between the two layers of flat wires along the radial direction of the stator core. The length of the arc-shaped filler along the circumferential direction of the stator core is greater than the length of any one of the flat wires along the circumferential direction of the stator core and greater than the height of the arc-shaped filler along the axial direction of the stator core.

[0005] In the embodiments of this application, the arc-shaped filler is filled in the gap between the two layers of flat wires. The arc-shaped filler can play a role in fixing and supporting the two layers of flat wires, reducing the occurrence of the two layers of flat wires moving towards each other. The arc-shaped filler restricts the radial movement of the two layers of flat wires, and the positions of the two layers of flat wires are relatively fixed, which is beneficial to reducing the mechanical vibration amplitude of the solder joints between each group of flat wires in each layer of flat wires. Therefore, it is beneficial to reduce the risk of fatigue failure of the solder joints in each group of flat wires and improve the anti-mechanical vibration and impact ability of the two layers of flat wires.

[0006] Secondly, the arc-shaped filler can limit the distance between the two layers of flat wires, which can ensure that the electrical clearance and creepage distance between the solder joints of the two layers of flat wires are not affected by the poor rigidity of the two layers of flat wires.

[0007] In addition, during the dipping process of multiple flat wires, the arc-shaped filler can absorb the paint liquid. After partial paint liquid remains in the arc-shaped filler and solidifies, it can increase its own hardness, so that the arc-shaped filler can effectively reduce the mechanical vibration amplitude of the flat wire solder joints. Moreover, the gap formed between the arc-shaped filler and the two layers of flat wires is smaller than the gap between the two layers of flat wires. The small gap between the arc-shaped filler and the two layers of flat wires is conducive to adsorbing the paint liquid and reducing the loss of the paint liquid. The retention amount of the paint liquid between the two layers of flat wires and between multiple groups of flat wires in each layer of flat wires increases, and the overall paint hanging amount of the multiple flat wires increases, which is beneficial to improving the overall stiffness of the multiple flat wires, thereby reducing the risk of fatigue failure of the solder joints in each group of flat wires.

[0008] In one embodiment, along the axial direction of the stator core, the height of the one arc-shaped filler is less than the height of any layer of the flat wires. In the embodiment of the present application, along the axial direction of the stator core, the height of the arc-shaped filler is less than the distance between one end of any one of the flat wires in the two layers of flat wires and one end of the stator core. The arc-shaped filler can be arranged axially along the stator core between one end of the two layers of flat wires and one end of the stator core, and the arc-shaped filler does not additionally increase the axial dimension of the stator, which is beneficial to the miniaturization of the stator.

[0009] In one embodiment, the length of the one arc-shaped filler along the circumferential direction of the stator core is greater than the pitch along the circumferential direction of the stator core between two adjacent groups of the flat wires in any layer of the flat wires. In the embodiment of the present application, the circumferential length of the arc-shaped filler is relatively long, which is beneficial for the arc-shaped filler to play a role in improving the anti-mechanical vibration and impact ability of the two layers of flat wires.

[0010] In one embodiment, the length of the one arc-shaped filler along the circumferential direction of the stator core is greater than the radial distance between the two layers of flat wires along the stator core. In the embodiment of the present application, the circumferential length of the arc-shaped filler is relatively long, which is beneficial for the arc-shaped filler to play a role in improving the anti-mechanical vibration and impact ability of the two layers of flat wires.

[0011] In one embodiment, among the two layers of flat wires, the distance between one layer of the flat wires and the axis of the stator core along the radial direction of the stator core is less than the distance between the other layer of the flat wires and the axis of the stator core. The length of the one arc-shaped filler along the circumferential direction of the stator core is greater than the outer circumference of the one layer of flat wires, increasing the overlapping area of the projection of the arc-shaped filler along the radial direction of the stator core and the projection of the two layers of flat wires along the radial direction of the stator core, which is beneficial for the arc-shaped filler to improve the anti-mechanical vibration and impact ability of the two layers of flat wires to reduce the risk of failure of the solder joints between the two flat wires in each group of flat wires.

[0012] In one embodiment, the length of the one arc-shaped filler along the circumferential direction of the stator core is less than the inner circumference of the other layer of flat wires, reducing the situation where the arc-shaped filler folds and accumulates between the two layers of flat wires, resulting in an increase in the radial width of the two layers of flat wires, which is beneficial to reducing the radial dimension of the stator.

[0013] In one embodiment, the arc-shaped filler includes a plurality of pores, and the axial direction of each pore intersects with the axial direction of the stator core. In the embodiment of the present application, when a plurality of flat wires are subjected to dip painting treatment, the paint liquid can flow through the plurality of pores of the arc-shaped filler to other layers of flat wires, so as to ensure that a certain amount of paint adheres to the other layers of flat wires, reducing the adverse effects of the arc-shaped filler on the other layers of flat wires. Moreover, the paint liquid filled in the pores of the arc-shaped filler solidifies, making the arc-shaped filler hardened, thereby playing a role in supporting and fixing the plurality of flat wires.

[0014] In addition, the axial direction of the pore intersects with the axial direction of the stator core, which is beneficial to the radial flow of the paint liquid during radial dip painting, so as to increase the overall paint adhesion amount of the plurality of flat wires.

[0015] In one embodiment, the aperture diameter of each pore is smaller than the spacing between the two layers of flat wires along the radial direction of the stator core and smaller than the spacing between any two adjacent groups of the flat wires in any one layer of the flat wires along the circumferential direction of the stator core. In the embodiment of the present application, the aperture diameter of the pore is smaller than the gap between the two layers of flat wires and the gap between multiple groups of flat wires in each layer of flat wires. The smaller aperture diameter of the pore is beneficial to increasing the amount of paint liquid received by the arc-shaped filler, so as to increase the retention amount of the paint liquid between the two layers of flat wires and between multiple groups of flat wires in each layer of flat wires, thereby increasing the overall paint adhesion amount of the plurality of flat wires.

[0016] In one embodiment, one arc-shaped filler includes two ends arranged oppositely along the axial direction of the stator core, and the distance between one end of the one arc-shaped filler and the stator core along the axial direction of the stator core is greater than the distance between the other end of the one arc-shaped filler and the stator core. Along the radial direction of the stator core, the thickness of one end of the one arc-shaped filler is greater than the thickness of the other end of the one arc-shaped filler.

[0017] In the embodiment of the present application, the thickness of one end of the arc-shaped filler near the solder joints of the two layers of flat wires is larger. The arc-shaped filler can play a role in fixing and supporting the position near the solder joints in the two layers of flat wires, which is beneficial to reducing the mechanical vibration amplitude of the solder joints in each group of flat wires, thereby being beneficial to reducing the risk of fatigue failure of the solder joints in each group of flat wires. The thickness of the other end of the arc-shaped filler is smaller, which is convenient for installing the arc-shaped filler between the two layers of flat wires.

[0018] In one embodiment, the one arc-shaped filler includes two intersecting sub-sheets. The two sub-sheets are connected to each other at one end close to the stator core along the axial direction of the stator core, and the other ends of the two sub-sheets along the axial direction of the stator core are spaced apart from each other along the radial direction of the stator core. In the embodiment of the present application, the two sub-sheets are connected in a V shape, and the gap between the two sub-sheets is conducive to the flow of paint liquid, reducing the adverse effect of the arc-shaped filler on the paint hanging amount of other layers of flat wires. Moreover, the gap between the two sub-sheets can be used to fill the paint liquid, which is beneficial to improving the structural strength of the arc-shaped filler, thereby facilitating the arc-shaped filler to better support and fix multiple flat wires.

[0019] In one embodiment, the included angle between the two sub-sheets is greater than 0° and less than or equal to 30°. In the embodiment of the present application, the included angle between the two sub-sheets being greater than 0° is beneficial to supporting and fixing two layers of flat wires, and is also beneficial to increasing the overall paint hanging amount of multiple flat wires and improving the stiffness of multiple flat wires.

[0020] In addition, the included angle between the two sub-sheets is less than or equal to 30°, which limits the distance between the other ends of the two sub-sheets. The arc-shaped filler will not additionally increase the overall radial dimension of multiple flat wires, or the increase amount of the arc-shaped filler for increasing the overall radial dimension of multiple flat wires is small, which is beneficial to the miniaturization of the stator.

[0021] In one embodiment, some of the multiple flat wires are used to connect a bus bar, and the one bus bar is used to receive alternating current and transmit the received alternating current to the some flat wires. Along the circumferential direction of the stator core, the length of the one bus bar is less than the length of any layer of the flat wires. Along the axial direction of the stator core, the one arc-shaped filler is arranged between the one bus bar and the one end of the stator core.

[0022] In the embodiment of the present application, the projection of the arc-shaped filler along the axial direction of the stator core and the projection of the bus bar at least partially overlap. In the embodiment of the present application, the arc-shaped filler is arranged between the bus bar and the stator core, improving the anti-mechanical vibration and impact ability of the multiple flat wires between the bus bar and the stator core, and being beneficial to improving the connection reliability between the bus bar and some flat wires.

[0023] In one embodiment, the angle of the arc formed by the one bus bar is greater than 90° and less than 180°. The angle of the arc formed by the one arc-shaped filler is greater than or equal to the angle of the arc formed by the one bus bar. In the embodiment of the present application, the length of the arc-shaped filler along the circumferential direction of the stator core is greater than or equal to the length of the bus bar, which is beneficial to improving the anti-mechanical vibration and impact ability of the multiple flat wires between the bus bar and the stator core, thereby improving the welding reliability between the flat wire and the bus bar and between the flat wires.

[0024] In one embodiment, each of the flat wires includes a bent section and an axial section that are connected and intersect. One end of each bent section is used to connect to one end of an axial section, and the other end of each bent section is used to insert into a winding slot. The other ends of the axial sections of two flat wires in each group of flat wires are welded together. Radially along the stator core, the one arc-shaped filler is arranged between the bent sections of the two layers of flat wires.

[0025] In the embodiment of the present application, the arc-shaped filler is arranged between the bent sections of the two layers of flat wires, which is beneficial to improving the anti-mechanical vibration and impact resistance of multiple bent sections in the two layers of flat wires and is beneficial to reducing the vibration of multiple flat wires.

[0026] In one embodiment, axially along the stator core, the height of the one arc-shaped filler is less than the height of any one of the bent sections. In the embodiment of the present application, the height of the arc-shaped filler is small, reducing the risk of the arc-shaped filler falling off.

[0027] In one embodiment, circumferentially along the stator core, the length of the one arc-shaped filler is greater than the length of any one of the bent sections. In the embodiment of the present application, the length of the arc-shaped filler is long, which is beneficial for the arc-shaped filler to play the role of improving the anti-mechanical vibration and impact resistance of multiple flat wires.

[0028] In one embodiment, each bent section includes two ends along its extending direction. One end of each bent section is used to connect to an axial section. Axially along the stator core, the distance between the one arc-shaped filler and the one end of the bent section is less than the distance between the one arc-shaped filler and the other end of the bent section.

[0029] In the embodiment of the present application, since one end of the bent section is closer to the solder joint between two axial sections of the same group, and the arc-shaped filler is arranged close to the solder joint, it can increase the anti-mechanical vibration and impact resistance of the flat wire near the solder joint and effectively improve the reliability of flat wire welding.

[0030] In one embodiment, the bent section is used for tying a binding wire, and the binding wire is used to fix the one arc-shaped filler. In the embodiment of the present application, the binding wire can limit the arc-shaped filler within the binding wire, making the arc-shaped filler more stably fixed between the layers of flat wires and reducing the risk of the arc-shaped filler coming out. Moreover, the binding wire can also increase the paint hanging amount of multiple flat wires, which is beneficial to better improving the rigidity of multiple flat wires.

[0031] In addition, the binding wire can also be used to fix multiple layers of flat wires. The binding wire can bind multiple layers of flat wires together, which can limit the radial displacement of multiple layers of flat wires along the stator core and is beneficial to improving the reliability of flat wire welding. At the same time, the binding wire is tied at the position of the bent sections where multiple flat wires overlap, which can to a certain extent inhibit the amplitude of multiple flat wires in the circumferential direction.

[0032] In one embodiment, the bent section includes two arc segments and a straight segment. Two ends of the straight segment are respectively used for connecting the two arc segments. Each arc segment intersects with the straight segment, and the two arc segments are used for binding the binding wire. In the embodiment of the present application, the binding wire is bound to the two arc segments of the bent section, which improves the binding firmness of the binding wire, so as to facilitate the use of the binding wire to improve the rigidity of multiple flat wires.

[0033] In a second aspect, the present application provides a powertrain, which includes a reducer and the flat wire motor as described above. The flat wire motor includes a rotor and a motor shaft. Along the radial direction of the stator core, the stator core is sleeved on the outer periphery of the rotor, the rotor is sleeved and fixed on the motor shaft, and the input shaft of the reducer of the reducer is used for driving connection with the motor shaft.

[0034] In a third aspect, the present application provides an electric vehicle, which is characterized in that the electric vehicle includes wheels, a battery pack and the flat wire motor as described above or includes the powertrain as described above. The flat wire motor or the powertrain is used for receiving the power supply of the battery pack and driving the wheels. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be described below.

[0036] Figure 1 Schematic diagram of an electric vehicle provided by an embodiment of the present application.

[0037] Figure 2 Schematic diagram of a powertrain provided by an embodiment of the present application.

[0038] Figure 3 Stereogram of a stator provided by an embodiment of the present application.

[0039] Figure 4 Top view of a stator provided by an embodiment of the present application.

[0040] Figure 5 Schematic diagram of two groups of flat wires in one layer of flat wires provided by an embodiment of the present application.

[0041] Figure 6 Cross-sectional view of a stator provided by an embodiment of the present application.

[0042] Figure 7 For the present application Figure 6 Partial enlarged view of part Q.

[0043] Figure 8 Stereogram of a stator provided by an embodiment of the present application. Detailed Description of the Invention

[0044] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0045] For the convenience of understanding, the relevant technical terms involved in the embodiments of the present application will be explained and described below.

[0046] Parallel: The parallel defined in the embodiments of the present application is not limited to absolute parallelism. This definition of parallel can be understood as substantially parallel, allowing for non-absolute parallelism due to factors such as assembly tolerances, design tolerances, and the influence of structural flatness.

[0047] Perpendicular: The perpendicular defined in the embodiments of the present application is not limited to an absolute perpendicular intersection (angle of 90 degrees). It allows for a non-absolute perpendicular intersection relationship due to factors such as assembly tolerances, design tolerances, and the influence of structural flatness, and allows for errors within a small angular range. For example, within an assembly error range of 80 degrees to 100 degrees, it can be understood as a perpendicular relationship.

[0048] Please refer to Figure 1 , Figure 1 , which is a schematic diagram of an electric vehicle provided by an embodiment of the present application. The electric vehicle includes a battery pack 3, wheels 2, and a powertrain 1. The powertrain 1 and the battery pack 3 are installed on the frame of the electric vehicle, and the powertrain 1 is used to receive power supply from the battery pack 3 and drive the wheels 2 to rotate.

[0049] Among them, electric vehicles include two-wheeled, three-wheeled or four-wheeled vehicles. The electric vehicle can be one of a pure electric vehicle (Pure Electric Vehicle / Battery Electric Vehicle, PEV / BEV), a hybrid electric vehicle (Hybrid Electric Vehicle, HEV), a range extended electric vehicle (Range Extended Electric Vehicle, REEV), a plug-in hybrid electric vehicle (Plug-in Hybrid Electric Vehicle, PHEV), and a new energy vehicle (New Energy Vehicle). In one embodiment, the electric vehicle is a means of transportation. In one embodiment, the electric vehicle is one of a commercial vehicle, a passenger car, a motorcycle, a flying car, and a train. In one embodiment, the electric vehicle is an industrial vehicle or an engineering vehicle. Exemplarily, the electric vehicle is one of a forklift, a trailer, a tractor, an excavator, a bulldozer, and a crane. In one embodiment, the vehicle can be an electric car or a fuel car. In one embodiment, the electric vehicle can also be agricultural equipment (such as a lawn mower, a harvester, etc.), amusement equipment, a toy vehicle, etc.

[0050] In one embodiment, an electric vehicle may include one or more powertrains 1 .

[0051] See also Figure 2 , Figure 2 A schematic diagram of a powertrain provided in one embodiment of the present application. The powertrain 1 includes a reducer 5 and a motor 4. The motor 4 includes a motor shaft, which is used for driving connection with the input shaft of the reducer 5. The rotation of the motor shaft can drive the input shaft of the reducer 5 to rotate, so that the power output by the motor 4 is transmitted to the input shaft of the reducer 5. Among them, the axial direction of the input shaft of the reducer 5 is parallel to the axial direction of the motor shaft of the motor 4. The gear set of the reducer 5 can change the transmission ratio between the motor 4 and the wheel 2.

[0052] In one embodiment, the reducer 5 further includes a differential 6. The differential 6 is drivingly connected to the gear set of the reducer 5. The half shaft 7 of the differential 6 is fixedly connected to the wheel 2. The reducer 5 receives the power transmitted by the motor shaft through the gear set of the reducer 5 and transmits the power to the half shaft 7 through the differential 6 to drive the wheel 2 to rotate. The differential 6 realizes differential rotation of the two half shafts 7 of the differential 6 through the planetary gear set of the differential 6.

[0053] In one embodiment, the powertrain 1 may include one motor 4 or one reducer 5. In one embodiment, the powertrain 1 may include multiple motors 4 or multiple reducers 5.

[0054] In one embodiment, the motor 4 includes a motor shaft, a rotor, and a stator 10. Among them, the rotor is sleeved and fixed on the outer surface of the motor shaft. The magnetic steel of the rotor generates the magnetic field of the rotor. The stator 10 includes a stator core 100 and motor windings. The stator core 100 and the rotor are arranged at intervals along the axial direction of the motor 4. The motor windings include multiple wires, and the multiple wires are installed and fixed on the stator core 100.

[0055] In one embodiment, the powertrain 1 further includes a motor controller (not shown in the figure). The motor controller is connected to the battery pack 3 and the motor windings. The motor controller is used to receive the direct current output by the battery pack 3 and convert the direct current output by the battery pack 3 into alternating current and then transmit it to the motor windings. After receiving the alternating current, the rotating magnetic field generated by the motor windings interacts with the magnetic field generated by the magnetic steel of the rotor. The interaction of the electromagnetic fields causes the rotor to rotate, thereby driving the motor shaft to rotate.

[0056] The stator 10 of the flat wire motor 4 in the present application will be introduced in detail below.

[0057] Please refer to Figure 3 , Figure 3 which is a perspective view of the stator provided by an embodiment of the present application. The present application provides a flat wire motor 4, and the stator 10 of the flat wire motor 4 includes a stator core 100. The stator core 100 includes a plurality of winding slots 110. The plurality of winding slots 110 are arranged at intervals along the circumferential direction of the stator core 100, and each winding slot 110 axially penetrates the stator core 100 along the axial direction of the stator core 100. As Figure 3 shown, a plurality of flat wires 200 are exposed at one end of the stator core 100 along the axial direction of the stator core 100.

[0058] Please refer to Figure 4 , Figure 4 which is a top view of the stator provided by an embodiment of the present application. The plurality of flat wires 200 are arranged in layers along the radial direction of the stator core 100. The multi-layer flat wires 200 along the radial direction of the stator core 100 include two adjacent layers of flat wires 200, and each layer of flat wires 200 in the two layers of flat wires 200 includes a plurality of groups of flat wires 200 arranged along the circumferential direction of the stator core 100.

[0059] Please refer to Figure 5 , Figure 5 which is a schematic diagram of two groups of flat wires in one layer of flat wires provided by an embodiment of the present application. Each group of flat wires 200 includes two flat wires 200. One ends of the two flat wires 200 are welded along the radial direction of the stator core 100, and the other ends of the two flat wires 200 are respectively used to be inserted into different winding slots 110.

[0060] Please refer to Figure 6 and Figure 7 , Figure 6 which is a sectional view of the stator provided by an embodiment of the present application. Figure 7 For the present applicationFigure 6 A partial enlarged view of the Q part in

[0061] Among them, the axial direction of the stator core 100 is parallel to the axial direction of the motor shaft and perpendicular to the circumferential direction of the stator core 100.

[0062] The stator core 100 includes two opposite ends along the axial direction of the stator core 100, and multiple flat wires 200 are arranged at one end of the stator core 100. The flat wire 200 is a flat wire. Multiple flat wires 200 are used to form a motor winding.

[0063] Among the multiple flat wires 200, there are two layers of flat wires 200, and the two layers of flat wires 200 are arranged at intervals along the radial direction of the stator core 100. In the two layers of flat wires 200, each layer of flat wires 200 includes multiple groups of flat wires 200. In each group of flat wires 200, one end of one flat wire 200 is arranged and welded with one end of another flat wire 200 along the radial direction of the stator core 100.

[0064] As Figure 5 shown, among two adjacent groups of flat wires 200 along the circumferential direction of the stator core 100, one flat wire 200 of one group of flat wires 200 is arranged along the circumferential direction of the stator core 100 with one flat wire 200 of another group of flat wires 200. That is, one end of one flat wire 200 of one group of flat wires 200 is arranged at intervals along the circumferential direction of the stator core 100 with one end of one flat wire 200 of another group of flat wires 200, and the other end of one flat wire 200 of one group of flat wires 200 is arranged at intervals along the circumferential direction of the stator core 100 with the other end of one flat wire 200 of another group of flat wires 200. Similarly, another flat wire 200 of one group of flat wires 200 is arranged along the circumferential direction of the stator core 100 with another flat wire 200 of another group of flat wires 200.

[0065] In each group of flat wires 200, the distance from one end of one flat wire 200 along the radial direction of the stator core 100 to the axis of the stator core 100 is less than the distance from another flat wire 200 to the axis of the stator core 100. Along the radial direction of the stator core 100, the distance from one layer of flat wires 200 to the axis of the stator core 100 is less than the distance from another layer of flat wires 200 to the axis of the stator core 100. Then the arc-shaped filler 300 is arranged along the radial direction of the stator core 100 between another flat wire 200 of multiple groups of flat wires 200 in one layer of flat wires 200 and one flat wire 200 of multiple groups of flat wires 200 in another layer of flat wires 200.

[0066] The arc-shaped filler 300 extends circumferentially along the stator core 100. The length direction of the arc-shaped filler 300 is parallel to the circumferential direction of the stator core 100. Along the radial direction of the stator core 100, the projection of the arc-shaped filler 300 overlaps at least partially with the projection of one layer of flat wires 200, and the projection of the arc-shaped filler 300 overlaps at least partially with the projection of another layer of flat wires 200.

[0067] In the embodiment of the present application, the arc-shaped filler 300 is filled in the gap between two layers of flat wires 200. The arc-shaped filler 300 can play a role in fixing and supporting the two layers of flat wires 200, reducing the occurrence of the two layers of flat wires 200 moving towards each other. The positions of the two layers of flat wires 200 are relatively fixed, which is beneficial to reducing the mechanical vibration amplitude of the solder joints between each group of flat wires 200 in each layer of flat wires 200, thereby being beneficial to reducing the risk of fatigue failure of the solder joints in each group of flat wires 200 and improving the anti-mechanical vibration and impact ability of multiple flat wires 200.

[0068] Secondly, the arc-shaped filler 300 can limit the distance between the two layers of flat wires 200, ensuring that the electrical clearance and creepage distance between the solder joints of the two layers of flat wires 200 are not compromised due to the poor rigidity of the two layers of flat wires 200.

[0069] Generally, after multiple flat wires 200 are installed, dip painting treatment is required to improve the moisture-proof, insulation, heat conduction, and anti-mechanical vibration and impact abilities of the multiple flat wires 200. Since the gap between the two layers of flat wires is relatively large, during the dip painting process, the insulating paint cannot effectively remain in the two layers of flat wires 200, resulting in less paint hanging on the two layers of flat wires 200, and the insulating paint contributing less to the heat conduction and anti-mechanical vibration and impact abilities of the two layers of flat wires 200.

[0070] In the embodiment of the present application, the gap formed between the arc-shaped filler 300 and the two layers of flat wires 200 is smaller than the gap between the two layers of flat wires 200. The small gap between the arc-shaped filler 300 and the two layers of flat wires 200 is beneficial to adsorbing the paint liquid and reducing the loss of the paint liquid. The retention amount of the paint liquid between the two layers of flat wires 200 and between multiple groups of flat wires 200 in each layer of flat wires 200 increases, and the overall paint hanging amount of the multiple flat wires 200 increases, which is beneficial to improving the overall stiffness of the multiple flat wires 200, thereby being beneficial to reducing the risk of fatigue failure of the solder joints in each group of flat wires 200.

[0071] In addition, the arc-shaped filler 300 can absorb the paint liquid. After a part of the paint liquid retained in the arc-shaped filler 300 solidifies, it can increase its own hardness, so that the arc-shaped filler 300 can effectively reduce the mechanical vibration amplitude of the solder joints of the flat wires 200.

[0072] In one embodiment, the arc-shaped filler 300 includes a sponge-like filler and a woven fabric. Among them, the woven fabric includes at least one insulating fiber, and at least one insulating fiber is used to weave and form the woven fabric. During the assembly process of the arc-shaped filler 300, the arc-shaped filler 300 can be compressed to adapt to the varying gap distances between the solder joint layers. During the dip painting process of the multiple flat wires 200, the arc-shaped filler 300 can adsorb the insulating paint, and with the curing of the insulating paint, its stiffness is improved, which can effectively reduce the mechanical vibration amplitude of the solder joints. In one embodiment, the insulating fiber has at least one of the functions of oil resistance, high temperature resistance, and insulation.

[0073] In one embodiment, an arc-shaped filler 300 is arranged between any two adjacent layers of flat wires 200 along the radial direction of the stator core 100. As Figure 4 and Figure 7 shown, three layers of flat wires 200 are exposed at one end of the stator core 100. The three layers of flat wires 200 are the first layer of flat wire 200, the second layer of flat wire 200, and the third layer of flat wire 200 respectively. The first layer of flat wire 200, the second layer of flat wire 200, and the third layer of flat wire 200 are arranged at intervals in sequence along the radial direction of the stator core 100. One arc-shaped filler 300 is arranged between the first layer of flat wire 200 and the second layer of flat wire 200, and another arc-shaped filler 300 is arranged between the second layer of flat wire 200 and the third layer of flat wire 200.

[0074] In the embodiments of the present application, an arc-shaped filler 300 is filled between any two adjacent layers of flat wires 200. The arc-shaped filler 300 can play a role in fixing and supporting the multiple layers of flat wires 200, reducing the occurrence of the situation where the multiple layers of flat wires 200 move towards each other. The positions of the multiple layers of flat wires 200 are relatively fixed, which is beneficial to reducing the mechanical vibration amplitude of the solder joints between each group of flat wires 200 in each layer of flat wire 200, thereby being beneficial to reducing the risk of fatigue failure of the solder joints in each group of flat wires 200 and improving the anti-mechanical vibration and impact ability of the multiple flat wires 200.

[0075] Please refer to Figure 7 , in one embodiment, along the axial direction of the stator core 100, the height of the arc-shaped filler 300 is less than the height of any layer of flat wire 200. Among them, the height of any layer of flat wire 200 refers to the distance between one end of any layer of flat wire 200 departing from the stator core 100 along the axial direction of the stator core 100 and one end of the stator core 100.

[0076] In the embodiments of the present application, along the axial direction of the stator core 100, the height of the arc-shaped filler 300 is less than the distance between one end of any one of the two layers of flat wires 200 and one end of the stator core 100. The arc-shaped filler 300 can be arranged along the axial direction of the stator core 100 between one end of the two layers of flat wires 200 and one end of the stator core 100. The arc-shaped filler 300 will not additionally increase the axial dimension of the stator 10, which is beneficial to the miniaturization of the stator 10.

[0077] See also Figure 4 In one embodiment, the length of the arc filler 300 along the circumferential direction of the stator core 100 is greater than the spacing between one ends of two adjacent groups of flat wires 200 in any layer of flat wires 200 along the circumferential direction of the stator core 100. Among them, in any two adjacent groups of flat wires 200 in any layer of flat wires 200, the spacing between one end of a flat wire 200 in one group of flat wires 200 and one end of a flat wire 200 in another group of flat wires 200 along the circumferential direction of the stator core 100 is less than the circumferential length of the arc filler 300, and the spacing between one end of another flat wire 200 in one group of flat wires 200 and one end of another flat wire 200 in another group of flat wires 200 along the circumferential direction of the stator core 100 is less than the circumferential length of the arc filler 300.

[0078] In the embodiment of the present application, the arc-shaped filler 300 has a relatively long circumferential length, which is beneficial for the arc-shaped filler 300 to play a role in improving the ability of the two-layer flat wire 200 to resist mechanical vibration and impact.

[0079] See also Figure 4 In one embodiment, the length of the arc filler 300 along the circumference of the stator core 100 is greater than the radial spacing of the two layers of flat wires 200 along the stator core 100. Among the two layers of flat wires 200, the distance between one end of one layer of flat wires 200 axially away from the stator core 100 and one end of the other layer of flat wires 200 axially away from the stator core 100 is less than the circumferential length of the arc filler 300. In the embodiment of the present application, the circumferential length of the arc filler 300 is longer, which is conducive to the arc filler 300 playing a role in improving the mechanical vibration impact resistance of the two layers of flat wires 200.

[0080] In one embodiment, the length of the arc filler 300 along the circumference of the stator core 100 is greater than the outer circumference of one layer of flat wires 200 and less than the inner circumference of another layer of flat wires 200. Among the two layers of flat wires 200, the distance between one layer of flat wires 200 and the axis of the stator core 100 along the radial direction of the stator core 100 is less than the distance between the other layer of flat wires 200 and the axis of the stator core 100. The outer circumference of one layer of flat wires 200 refers to the circumferential length of the outer circumference of the ring formed by the projection of one layer of flat wires 200 along the axial direction. The inner circumference of another layer of flat wires 200 refers to the circumferential length of the inner circumference of the ring formed by the projection of another layer of flat wires 200 along the axial direction.

[0081] In the embodiment of the present application, the circumferential length of the arc-shaped filler 300 is greater than the outer circumference of one layer of flat wire 200, increasing the overlapping area between the projection of the arc-shaped filler 300 along the radial direction of the stator core 100 and the projection of two layers of flat wire 200 along the radial direction of the stator core 100, which is beneficial to better supporting and fixing the two layers of flat wire 200 by the arc-shaped filler 300 to improve the anti-mechanical vibration and impact ability of the two layers of flat wire 200.

[0082] In addition, the circumferential length of the arc-shaped filler 300 is less than the inner circumference of another layer of flat wire 200, reducing the situation that the arc-shaped filler 300 folds and accumulates between the two layers of flat wire 200, resulting in an increase in the radial width of the two layers of flat wire 200, which is beneficial to reducing the radial size of the stator 10.

[0083] Please refer to Figure 4 , in an embodiment, the arc-shaped filler 300 is in a circular ring shape. That is, the arc-shaped filler 300 is a complete circular ring, and the central angle corresponding to the arc-shaped filler 300 is 360°. In the embodiment of the present application, the head and tail ends of the arc-shaped filler 300 are connected along the circumference, or the arc-shaped filler 300 is an integrated complete circular ring structure, which can effectively improve the anti-mechanical vibration and impact ability of the two layers of flat wire 200.

[0084] In an embodiment, a plurality of arc-shaped fillers 300 are arranged between the two layers of flat wire 200, and the plurality of arc-shaped fillers 300 are arranged in sequence along the circumference of the stator core 100. Each arc-shaped filler 300 is arc-shaped, and the central angle corresponding to each arc-shaped filler 300 is less than 360°. Among them, the plurality of arc-shaped fillers 300 are connected end to end to form a ring, or the plurality of arc-shaped fillers 300 are arranged at intervals along the circumference of the stator core 100. In the embodiment of the present application, filling a plurality of arc-shaped fillers 300 between the two layers of flat wire 200 is beneficial to reducing the assembly difficulty of each arc-shaped filler 300 and is beneficial to effectively improving the anti-mechanical vibration and impact ability of the two layers of flat wire 200.

[0085] In an embodiment, a plurality of arc-shaped fillers 300 are stacked and arranged along the radial direction of the stator core 100 between the two layers of arc-shaped fillers 300. The plurality of arc-shaped fillers 300 can better fill the gap between the two layers of flat wire 200, which is beneficial to effectively improving the anti-mechanical vibration and impact ability of the two layers of flat wire 200.

[0086] In one embodiment, the arc-shaped filler 300 includes a plurality of pores, and the axial direction of each pore intersects with the axial direction of the stator core 100. Among them, the plurality of pores can be used to accommodate the flow of varnish. In the embodiment of the present application, when the plurality of flat wires 200 are subjected to drip varnishing treatment, the varnish can flow through the plurality of pores of the arc-shaped filler 300 to other layers of flat wires 200, so as to ensure that the other layers of flat wires 200 have a certain amount of varnish hanging, and reduce the adverse effects of the arc-shaped filler 300 on the other layers of flat wires 200. Moreover, the varnish filled in the pores of the arc-shaped filler 300 cures, so that the arc-shaped filler 300 hardens, thereby playing a role in supporting and fixing the plurality of flat wires 200.

[0087] In addition, the axial direction of the pore intersects with the axial direction of the stator core 100, which is beneficial to the radial flow of the varnish during radial drip varnishing, so as to increase the overall varnish hanging amount of the plurality of flat wires 200.

[0088] In one embodiment, the aperture of each pore is smaller than the spacing between two layers of flat wires 200 in the radial direction of the stator core 100 and smaller than the spacing between one end of any two adjacent groups of flat wires 200 in any layer of flat wires 200 in the circumferential direction of the stator core 100. Among them, in the radial direction of the stator core 100, the aperture of the pore is smaller than the spacing between one end of one layer of flat wires 200 deviating from the stator core 100 in the axial direction and one end of another layer of flat wires 200 deviating from the stator core 100 in the axial direction. In any two adjacent groups of flat wires 200 in each layer of flat wires 200, the spacing between one end of one flat wire 200 in one group of flat wires 200 and one end of one flat wire 200 in another group of flat wires 200 is greater than the aperture of the pore, and the spacing between the other end of one flat wire 200 in one group of flat wires 200 and the other end of one flat wire 200 in another group of flat wires 200 is greater than the aperture of the pore.

[0089] In the embodiment of the present application, the aperture of the pore is smaller than the gap between two layers of flat wires 200 and the gap between multiple groups of flat wires 200 in each layer of flat wires 200. The aperture of the pore is small, which is beneficial to increasing the amount of varnish received by the arc-shaped filler 300, so as to increase the retention amount of the varnish between two layers of flat wires 200 and between multiple groups of flat wires 200 in each layer of flat wires 200, thereby increasing the overall varnish hanging amount of the plurality of flat wires 200.

[0090] Please refer to Figure 7, in one embodiment, the arc-shaped filler 300 includes two opposite ends along the axial direction of the stator core 100. The distance between one end of the arc-shaped filler 300 and the stator core 100 along the axial direction of the stator core 100 is greater than the distance between the other end of the arc-shaped filler 300 and the stator core 100. The thickness of one end of the arc-shaped filler 300 along the radial direction of the stator core 100 is greater than the thickness of the other end of the arc-shaped filler 300. Wherein, along the axial direction of the stator core 100, the distance between one end of the arc-shaped filler 300 and one end of each flat wire 200 is less than the distance between the other end of the arc-shaped filler 300 and the other end of each flat wire 200. That is, one end of the arc-shaped filler 300 is closer to the end of the two layers of flat wires 200 that deviates from the stator core 100 along the axial direction.

[0091] In the embodiment of the present application, the thickness of one end of the arc-shaped filler 300 near the solder joints of the two layers of flat wires 200 is larger. The arc-shaped filler 300 can play a role in fixing and supporting the position near the solder joints in the two layers of flat wires 200, which is beneficial to reducing the mechanical vibration amplitude of the solder joints in each group of flat wires 200, and thus is beneficial to reducing the risk of fatigue failure of the solder joints in each group of flat wires 200. The thickness of the other end of the arc-shaped filler 300 is smaller, which is convenient for installing the arc-shaped filler 300 between the two layers of flat wires 200.

[0092] Please refer to Figure 7 , in one embodiment, the arc-shaped filler 300 includes two intersecting sub-pieces 310, and the two sub-pieces 310 are connected at one end close to the stator core 100 along the axial direction of the stator core 100. The other ends of the two sub-pieces 310 are spaced apart along the radial direction of the stator core 100.

[0093] Wherein, each sub-piece 310 extends along the circumferential direction of the stator core 100. The two sub-pieces 310 are in a V-shaped structure. In one embodiment, the arc-shaped filler 300 includes a sheet-shaped filler, and the sheet-shaped filler is folded in half to form the arc-shaped filler 300, and both sides of the folding line are the two sub-pieces 310.

[0094] In the embodiment of the present application, the two sub-pieces 310 are connected in a V shape, and the gap between the two sub-pieces 310 is beneficial to the flow of the paint liquid, reducing the adverse effect of the arc-shaped filler 300 on other layers of flat wires 200. And the gap between the two sub-pieces 310 can be used to fill the paint liquid, which is beneficial to improving the structural strength of the arc-shaped filler 300, and thus is beneficial to the arc-shaped filler 300 to better support and fix multiple flat wires 200.

[0095] In one embodiment, the included angle between the two sub-pieces 310 is greater than 0° and less than or equal to 30°. In the embodiment of the present application, the included angle between the two sub-pieces 310 being greater than 0° is beneficial to playing a role in supporting and fixing the two layers of flat wires 200, and is also beneficial to increasing the overall paint hanging amount of multiple flat wires 200 and improving the stiffness of multiple flat wires 200.

[0096] In addition, the included angle between the two sub-pieces 310 is less than or equal to 30°, which limits the spacing between the other ends of the two sub-pieces 310. The arc filler 300 will not increase the overall radial size of the plurality of flat wires 200, or the arc filler 300 will only increase the overall radial size of the plurality of flat wires 200 by a small amount, which is conducive to the miniaturization of the stator 10.

[0097] See also Figure 8 , Figure 8 A three-dimensional diagram of a stator provided in an embodiment of the present application. In one embodiment, some of the flat wires 200 in the plurality of flat wires 200 are used to connect a busbar 400. The busbar 400 is used to receive alternating current and transmit the received alternating current to some of the flat wires 200. The length of the busbar 400 along the circumference of the stator core 100 is less than the length of any layer of flat wires 200. The arc filler 300 is arranged between the busbar 400 and one end of the stator core 100 along the axial direction of the stator core 100.

[0098] Part of the plurality of flat wires 200 can be connected to the busbar 400 by welding. The busbar 400 is arc-shaped and arranged at one end of the plurality of flat wires 200 away from the stator core 100 along the axial direction of the stator core 100 .

[0099] like Figure 8 In the illustrated embodiment, 12 flat wires 200 are connected to the busbar 400. Specifically, three layers of flat wires 200 are exposed at one end of the stator core 100. The three layers of flat wires 200 are respectively a first layer of flat wires 200, a second layer of flat wires 200, and a third layer of flat wires 200 arranged in sequence. Six flat wires 200 in the first layer of flat wires 200 and six flat wires 200 in the third layer of flat wires 200 are connected to the busbar 400. The second layer of flat wires 200 is arranged between the busbar 400 and the stator core 100 along the axial direction of the stator core 100.

[0100] In the embodiment of the present application, the projection of the arc-shaped filler 300 along the axial direction of the stator core 100 at least partially overlaps with the projection of the busbar 400. In the embodiment of the present application, the arc-shaped filler 300 is arranged between the busbar 400 and the stator core 100, which improves the mechanical vibration and impact resistance of the plurality of flat wires 200 between the busbar 400 and the stator core 100, and is conducive to improving the connection reliability between the busbar 400 and some flat wires 200.

[0101] In one embodiment, the angle of the arc formed by the bus bar 400 is greater than 90° and less than 180°. The angle of the arc formed by the arc-shaped filler 300 is greater than or equal to the angle of the arc formed by the bus bar 400. Herein, the angle of the arc is the degree of the central angle corresponding to the arc. The angle of the arc formed by the arc-shaped filler 300 is greater than 90° and less than or equal to 360°. In one embodiment, the angle of the arc formed by the bus bar 400 is 120°, and the angle of the arc formed by the arc-shaped filler 300 is 180°.

[0102] In the embodiment of the present application, the length of the arc-shaped filler 300 along the circumferential direction of the stator core 100 is greater than or equal to the length of the bus bar 400, which is beneficial to improving the anti-mechanical vibration and impact ability of the multiple flat wires 200 between the bus bar 400 and the stator core 100, thereby improving the welding reliability between the flat wire 200 and the bus bar 400 and between the flat wire 200 and the flat wire 200.

[0103] Referring to Figure 5 and Figure 7 , in one embodiment, each flat wire 200 includes a bent section 210 and an axial section 220 that are connected and intersect. One end of each bent section 210 is used to connect one end of an axial section 220, and the other end of each bent section 210 is used to insert into a winding slot 110. The other ends of the axial sections 220 of the two flat wires 200 in each group of flat wires 200 are welded together. The arc-shaped filler 300 is arranged between the bent sections 210 of the two layers of flat wires 200 along the radial direction of the stator core 100.

[0104] Herein, the bent sections 210 are arranged between the stator core 100 and the axial sections 220 along the axial direction of the stator core 100. Along the radial direction of the stator core 100, the projection of the arc-shaped filler 300 overlaps at least partially with the projections of the multiple bent sections 210 in the two layers of flat wires 200. Along the radial direction of the stator core 100, the projection of the arc-shaped filler 300 does not overlap with the projections of the multiple axial sections 220 in the two layers of flat wires 200. Along the axial direction of the stator core 100, the maximum distance between the arc-shaped filler 300 and one end of the stator core 100 is less than the minimum distance between any one of the axial sections 220 in the two layers of flat wires 200 and one end of the stator core 100.

[0105] In the embodiment of the present application, the arc-shaped filler 300 is arranged between the bent sections 210 of the two layers of flat wires 200, which is beneficial to improving the anti-mechanical vibration and impact ability of the multiple bent sections 210 in the two layers of flat wires 200 and is beneficial to reducing the vibration of the multiple flat wires 200.

[0106] In one embodiment, each flat wire 200 further includes an in-slot segment received in the winding slot 110. In each flat wire 200, the other end of the bent segment 210 is used to connect the in-slot segment. In each winding slot 110, the multiple in-slot segments respectively correspond to multiple sequences.

[0107] In one embodiment, the in-slot segments of two flat wires 200 in each group of flat wires 200 of each layer of flat wires 200 are adjacent in sequence in the winding slot 110.

[0108] For convenience of description, along the radial direction of the stator core 100 from the outer peripheral surface of the stator core 100 towards the inner peripheral surface of the stator core 100, the n layers in each winding slot 110 are sequentially referred to as the first layer, the second layer, the third layer, ……, the nth layer, where n is a positive integer greater than or equal to 2. n is equal to the number of in-slot segments accommodated in one winding slot 110. One in-slot segment occupies one layer of one winding slot 110.

[0109] Exemplarily, in one layer of flat wires 200, the in-slot segment of one flat wire 200 in each group of flat wires 200 is received in the first layer of one winding slot 110, and the in-slot segment of the other flat wire 200 in each group of flat wires 200 is received in the second layer of another winding slot 110. In another layer of flat wires 200, the in-slot segment of one flat wire 200 in each group of flat wires 200 is received in the third layer of one winding slot 110, and the in-slot segment of the other flat wire 200 in each group of flat wires 200 is received in the fourth layer of another winding slot 110.

[0110] In the embodiment of the present application, the in-slot segments of two flat wires 200 in each group are adjacent in sequence in different winding slots 110, which is convenient for welding the two axial segments 220 of each group of flat wires 200. And after the two flat wires 200 in each group of two layers of flat wires 200 are welded, a gap can be formed between the two layers of flat wires 200 for arranging an arc-shaped filler 300.

[0111] In one embodiment, the in-slot segments of one flat wire 200 in each group of flat wires 200 in each layer of flat wires 200 are the same in sequence in the winding slot 110. The in-slot segments of the other flat wire 200 in each group of flat wires 200 in each layer of flat wires 200 are the same in sequence in the winding slot 110. Exemplarily, the in-slot segments of one flat wire 200 in each group of flat wires 200 in one layer of flat wires 200 are all received in the first layer of the winding slot 110, and the in-slot segments of the other flat wire 200 in each group of flat wires 200 in one layer of flat wires 200 are all received in the second layer of the winding slot 110.

[0112] In the embodiment of the present application, each layer of flat wires 200 is arranged regularly, which is beneficial to filling the arc-shaped filler 300 between adjacent two layers of flat wires 200, so as to improve the anti-mechanical vibration and impact ability of multiple flat wires 200.

[0113] In one embodiment, along the axial direction of the stator core 100, the height of the arc-shaped filler 300 is less than the height of any bending section 210. In the embodiment of the present application, the height of the arc-shaped filler 300 is small, reducing the risk of the arc-shaped filler 300 falling off.

[0114] In one embodiment, along the circumferential direction of the stator core 100, the length of the arc-shaped filler 300 is greater than the length of any bending section 210. In the embodiment of the present application, the length of the arc-shaped filler 300 is long, which is beneficial for the arc-shaped filler 300 to play a role in improving the anti-mechanical vibration and impact ability of multiple flat wires 200.

[0115] In one embodiment, each bending section 210 includes two ends along its extending direction. One end of each bending section 210 is used to connect an axial section 220. Along the axial direction of the stator core 100, the distance between the arc-shaped filler 300 and one end of the bending section is less than the distance between the arc-shaped filler 300 and the other end of the bending section 210. In the embodiment of the present application, since one end of the bending section 210 is closer to the solder joint between two axial sections 220 in the same group, and the arc-shaped filler 300 is arranged close to the solder joint, it can increase the anti-mechanical vibration and impact ability of the flat wire 200 near the solder joint, and effectively improve the welding reliability of the flat wire 200.

[0116] Please refer to Figure 7 , in one embodiment, the bending section 210 is used to tie the binding wire 500, and the binding wire 500 is used to fix the arc-shaped filler 300. Among them, the binding wire 500 is inserted between multiple groups of flat wires 200 in each layer of flat wires 200 and in the gap between multiple layers of flat wires 200.

[0117] In one embodiment, the binding wire 500 can be a round binding wire or a flat braided tape. In one embodiment, the binding structure formed by the binding wire 500 binding multiple flat wires 200 is a rhombus. The rhombus-shaped binding structure can effectively bind the innermost and outermost flat wires 200 to their adjacent flat wires 200, and can effectively inhibit the displacement of the flat wires 200 along the radial and circumferential directions of the stator core 100.

[0118] In the embodiment of the present application, the binding wire 500 can limit the arc-shaped filler 300 within the binding wire 500, making the arc-shaped filler 300 more stably fixed between the layers of flat wires 200 and reducing the risk of the arc-shaped filler 300 coming out. Moreover, the binding wire 500 can also increase the paint hanging amount of multiple flat wires 200, which is beneficial for better improving the rigidity of multiple flat wires 200.

[0119] In addition, the tying wire 500 can also be used to fix the multi-layer flat wires 200. The tying wire 500 can bind the multi-layer flat wires 200 together, which can limit the radial displacement of the multi-layer flat wires 200 along the stator core 100, and is beneficial to improving the welding reliability of the flat wires 200. At the same time, the tying wire 500 is tied at the position of the bent section 210 where the flat wires 200 overlap, which can suppress the amplitude of multiple flat wires 200 in the circumferential direction to a certain extent.

[0120] In one embodiment, the tying wire 500 is used to tie multiple flat wires 200 exposed at one end of the stator core 100. This improves the overall anti-mechanical vibration and shock resistance of the multiple flat wires 200 and reduces the risk of solder joint failure.

[0121] In one embodiment, the tying wire 500 is used to tie some of the flat wires 200 between the bus bar 400 and the stator core 100. This improves the anti-mechanical vibration and shock resistance of some of the flat wires 200 between the bus bar 400 and the stator core 100, and is beneficial to improving the connection reliability between the bus bar 400 and some of the flat wires 200.

[0122] With reference to Figure 5 and Figure 7 , in one embodiment, the bent section 210 includes two arc segments 211 and a straight segment 212. The two ends of the straight segment 212 are respectively used to connect the two arc segments 211. Each arc segment 211 intersects with the straight segment 212, and the two arc segments 211 are used to tie the tying wire 500. Among them, one end of one arc segment 211 is used to connect one end of the straight segment 212, and the other end of one arc segment 211 is used to connect an axial segment 220. One arc segment 211 intersects with the axial segment 220.

[0123] One end of the other arc segment 211 is used to connect the other end of the straight segment 212, and the other end of the other arc segment 211 is used to connect a segment inside the slot. The other arc segment 211 intersects with the segment inside the slot.

[0124] In the embodiment of the present application, the tying wire 500 is tied to the two arc segments 211 of the bent section 210, which improves the tying firmness of the tying wire 500, so that the tying wire 500 can be used to improve the anti-mechanical vibration and shock resistance of multiple flat wires 200.

[0125] The flat wire motor, power assembly and electric vehicle provided by the embodiments of the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and embodiments of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific embodiments and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A flat wire motor, characterized in that, The stator of the flat wire motor includes a stator core, the stator core includes a plurality of winding slots, the plurality of winding slots are arranged at intervals along the circumferential direction of the stator core, each winding slot penetrates the stator core along the axial direction of the stator core, and a plurality of flat wires are exposed at one end of the stator core along the axial direction of the stator core. The plurality of flat wires are arranged in layers along the radial direction of the stator core. Along the radial direction of the stator core, the multi-layer flat wires include two adjacent layers of flat wires. Each layer of flat wires in the two layers of flat wires includes a plurality of groups of flat wires arranged along the circumferential direction of the stator core. Each group of flat wires includes two flat wires. One ends of the two flat wires are welded along the radial direction of the stator core, and the other ends of the two flat wires are respectively used to be inserted into different winding slots. Among them: An arc-shaped filler is arranged between the two layers of flat wires along the radial direction of the stator core. The length of the arc-shaped filler along the circumferential direction of the stator core is greater than the length of any one flat wire along the circumferential direction of the stator core and greater than the height of the arc-shaped filler along the axial direction of the stator core.

2. The flat wire motor according to claim 1, wherein Among them: Along the axial direction of the stator core, the height of the arc-shaped filler is less than the height of any layer of flat wires; The length of the arc-shaped filler along the circumferential direction of the stator core is greater than the circumferential pitch of the one ends of any two adjacent groups of flat wires in any layer of flat wires along the circumferential direction of the stator core and greater than the radial pitch between the two layers of flat wires along the radial direction of the stator core.

3. The flat wire motor according to claim 1, characterized in that, Among the two layers of flat wires, the distance from one layer of flat wires along the radial direction of the stator core to the axis of the stator core is less than the distance from the other layer of flat wires to the axis of the stator core. Among them: The length of the arc-shaped filler along the circumferential direction of the stator core is greater than the outer circumference of the one layer of flat wires and less than the inner circumference of the other layer of flat wires.

4. The flat wire motor according to claim 2, characterized in that, Among the two layers of flat wires, the distance from one layer of flat wires along the radial direction of the stator core to the axis of the stator core is less than the distance from the other layer of flat wires to the axis of the stator core. Among them: The length of the arc-shaped filler along the circumferential direction of the stator core is greater than the outer circumference of the one layer of flat wires and less than the inner circumference of the other layer of flat wires.

5. The flat wire motor according to claim 1, characterized in that, The arc-shaped filler includes a plurality of pores, and the axial direction of each pore intersects with the axial direction of the stator core. Among them: The aperture of each pore is less than the radial pitch between the two layers of flat wires and less than the circumferential pitch of the one ends of any two adjacent groups of flat wires in any layer of flat wires along the circumferential direction of the stator core.

6. The flat wire motor according to claim 2, wherein, The arc-shaped filler includes a plurality of pores, and the axial direction of each pore intersects with the axial direction of the stator core. Among them: The aperture of each pore is less than the radial pitch between the two layers of flat wires and less than the circumferential pitch of the one ends of any two adjacent groups of flat wires in any layer of flat wires along the circumferential direction of the stator core.

7. The flat wire motor according to claim 3, wherein The arc-shaped filler includes a plurality of pores, and the axial direction of each pore intersects with the axial direction of the stator core. Among them: The aperture diameter of each of the pores is less than the spacing between the two layers of flat wires in the radial direction of the stator core and less than the spacing between any two adjacent groups of the flat wires in any one layer of the flat wires in the circumferential direction of the stator core.

8. The flat wire motor according to claim 1, wherein One of the arc-shaped fillers includes two ends arranged oppositely along the axial direction of the stator core. The spacing between one end of the one arc-shaped filler and the stator core is greater than the spacing between the other end of the one arc-shaped filler and the stator core along the axial direction of the stator core, where: In the radial direction of the stator core, the thickness of one end of the one arc-shaped filler is greater than the thickness of the other end of the one arc-shaped filler.

9. The flat wire motor according to claim 2, wherein, One of the arc-shaped fillers includes two ends arranged oppositely along the axial direction of the stator core. The spacing between one end of the one arc-shaped filler and the stator core is greater than the spacing between the other end of the one arc-shaped filler and the stator core along the axial direction of the stator core, where: In the radial direction of the stator core, the thickness of one end of the one arc-shaped filler is greater than the thickness of the other end of the one arc-shaped filler.

10. The flat wire motor according to claim 3, wherein One of the arc-shaped fillers includes two ends arranged oppositely along the axial direction of the stator core. The spacing between one end of the one arc-shaped filler and the stator core is greater than the spacing between the other end of the one arc-shaped filler and the stator core along the axial direction of the stator core, where: In the radial direction of the stator core, the thickness of one end of the one arc-shaped filler is greater than the thickness of the other end of the one arc-shaped filler.

11. The flat wire motor according to claim 5, wherein, One of the arc-shaped fillers includes two ends arranged oppositely along the axial direction of the stator core. The spacing between one end of the one arc-shaped filler and the stator core is greater than the spacing between the other end of the one arc-shaped filler and the stator core along the axial direction of the stator core, where: In the radial direction of the stator core, the thickness of one end of the one arc-shaped filler is greater than the thickness of the other end of the one arc-shaped filler.

12. The flat wire motor according to any one of claims 1-11, characterized in that, One of the arc-shaped fillers includes two intersecting sub-sheets. The two sub-sheets are connected at one end close to the stator core along the axial direction of the stator core, and the other ends of the two sub-sheets are spaced apart in the radial direction of the stator core, where: The included angle between the two sub-sheets is greater than 0° and less than or equal to 30°.

13. The flat wire motor according to any one of claims 1-11, characterized in that, Some of the multiple flat wires are used to connect a bus bar. The one bus bar is used to receive alternating current and transmit the received alternating current to the some flat wires, where: In the circumferential direction of the stator core, the length of the one bus bar is less than the length of any one layer of the flat wires; In the axial direction of the stator core, the one arc-shaped filler is arranged between the one bus bar and one end of the stator core.

14. The flat wire motor according to claim 13, wherein The angle of the arc formed by the one bus bar is greater than 90° and less than 180°; The angle of the arc formed by the one arc-shaped filler is greater than or equal to the angle of the arc formed by the one bus bar.

15. The flat wire motor according to claim 12, characterized in that, Some of the multiple flat wires are used to connect a bus bar. The one bus bar is used to receive alternating current and transmit the received alternating current to the some flat wires, where: Circumferentially along the stator core, the length of the one busbar is less than the length of any layer of the flat wires. Axially along the stator core, the one arc-shaped filler is arranged between the one busbar and the one end of the stator core.

16. The flat wire motor according to any one of claims 1-11, 14-15, characterized in that, Each of the flat wires includes a bent section and an axial section that are connected and intersect. One end of each bent section is used to connect one end of an axial section, and the other end of each bent section is used to insert into one of the winding slots. The other ends of the axial sections of the two flat wires in each group of flat wires are welded together, where: Radially along the stator core, the one arc-shaped filler is arranged between the bent sections of the two layers of flat wires.

17. The flat wire motor according to claim 16, wherein Wherein: Axially along the stator core, the height of the one arc-shaped filler is less than the height of any one of the bent sections. Circumferentially along the stator core, the length of the one arc-shaped filler is greater than the length of any one of the bent sections.

18. The flat wire motor according to claim 16, wherein, Each bent section includes two ends along its extending direction. One end of each bent section is used to connect an axial section. Axially along the stator core, the distance between the one arc-shaped filler and the one end of the bent section is less than the distance between the one arc-shaped filler and the other end of the bent section.

19. The flat wire motor according to claim 16, wherein, The bent section is used to tie a binding wire, and the binding wire is used to fix the one arc-shaped filler.

20. The flat wire motor according to claim 19, wherein, The bent section includes two arc-shaped sections and a straight section. The two ends of the straight section are respectively used to connect the two arc-shaped sections. Each arc-shaped section intersects with the straight section, and the two arc-shaped sections are used to tie the binding wire.

21. A powertrain, characterized in that, The powertrain includes a reducer and a flat wire motor as claimed in any one of claims 1-20. The flat wire motor includes a rotor and a motor shaft. Radially along the stator core, the stator core is sleeved on the outer periphery of the rotor. The rotor is sleeved and fixed on the motor shaft. The input shaft of the reducer is used for driving connection with the motor shaft.

22. An electric vehicle, characterized in that, The electric vehicle includes wheels, a battery pack, and a flat wire motor as claimed in any one of claims 1-20 or includes a powertrain as claimed in claim 21. The flat wire motor or the powertrain is used to receive power supply from the battery pack and drive the wheels.

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