Hairpin motor, powertrain, and electric vehicle

Abstract

The present application provides a hairpin motor, a powertrain, and an electric vehicle. A stator of the motor comprises a stator core and a stator winding. In the axial direction of the stator, each winding slot and a central hole of the stator core run through two end surfaces of the stator core. The central hole is used for accommodating a rotor. A slot opening of each winding slot faces the central hole. Each rectangular copper wire of the stator winding comprises two lead-out ends, a plurality of straight segments, and a plurality of bridging segments. Each straight segment is arranged in one winding slot. Two ends of each bridging segment are respectively used for connecting two straight segments in different winding slots. Each lead-out end is connected to one straight segment. In the axial direction of the stator, some bridging segments in the rectangular copper wire are exposed from one end surface. Two ends of each bridging segment among some bridging segments are respectively connected to two straight segments by means of two connecting segments. In the circumferential direction of the stator core, the line width of each connecting segment is less than the slot opening width of each winding slot, and the slot opening width of each winding slot is less than the slot inner width and the line width of each straight segment or each bridging segment.

Description

Flat wire motor, power assembly and electric vehicle

[0001] The present application claims priority to the Chinese patent application No. 202411313457.8, filed on September 19, 2024, with the State Intellectual Property Office of China, with the title of "Flat wire motor, power assembly and electric vehicle", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of electric vehicles, in particular to a flat wire motor, a power assembly and an electric vehicle. BACKGROUND

[0003] At present, the driving motor in the power assembly of the electric vehicle is gradually replaced by the flat wire motor as the driving motor. The flat wire winding of the flat wire motor usually adopts the Hair-Pin, X-Pin, I-Pin, W-pin or S-Winding form, but it is difficult to meet the requirements of NVH performance, assembly efficiency, manufacturing cost, axial size and the like, thereby affecting the performance of the flat wire motor, the power assembly and the electric vehicle. SUMMARY

[0004] The present application provides a flat wire motor, a power assembly and an electric vehicle, which can meet the requirements of NVH performance, assembly efficiency, manufacturing cost, axial size and the like, thereby improving the performance of the flat wire motor, the power assembly and the electric vehicle, and reducing the manufacturing cost of the flat wire motor, the power assembly and the electric vehicle.

[0005] The present application provides a flat wire motor. The flat wire motor includes a motor stator, a motor rotor and a motor shaft. The motor stator is used to accommodate the motor rotor, and the motor rotor is used to be connected in transmission with the motor shaft. In the process of controlling the operation of the flat wire motor by the motor controller, the motor rotor in the flat wire motor rotates relative to the motor stator, and the motor rotor drives the motor shaft to rotate.

[0006] In the present application, the motor stator of the flat wire motor includes a stator core and a stator winding. The stator core is used to wind the stator winding. The stator winding is used to receive the alternating current provided by the motor controller. In the present application, the stator core includes two end faces, which are arranged opposite to each other along the axial direction of the stator core. The stator core includes a central hole and a plurality of winding slots. Each winding slot and the central hole penetrate through the two end faces of the stator core along the axial direction of the stator core. The central hole is used to accommodate the motor rotor of the flat wire motor. The slot opening of each winding slot faces the central hole. The slot opening width of each winding slot is less than the slot inner width of each winding slot.

[0007] In the embodiments of the present application, the stator winding includes a plurality of continuous wave winding flat wires. Each continuous wave winding flat wire includes two lead-out ends, a plurality of straight-line segments and a plurality of cross-over segments. Each straight-line segment is arranged in a winding slot. Two ends of each cross-over segment are used to connect two straight-line segments in different winding slots. Each lead-out end is used to connect one straight-line segment. The wire width of each straight-line segment in each continuous wave winding flat wire is greater than the slot opening width of each winding slot and less than the slot width of each winding slot.

[0008] In the embodiments of the present application, the wire width of each cross-over segment in each continuous wave winding flat wire is greater than the slot opening width of each winding slot and less than the slot width of each winding slot.

[0009] In one embodiment, the plurality of straight-line segments of the same continuous wave winding flat wire are arranged in different winding slots. In one embodiment, two ends of each cross-over segment in the same continuous wave winding flat wire are used to connect two straight-line segments in different winding slots. In one embodiment, one end of each straight-line segment in the same continuous wave winding flat wire is used for one cross-over segment or one lead-out end, and the other end of each straight-line segment is used for another cross-over segment or another lead-out end.

[0010] In the embodiments of the present application, one lead-out end of one continuous wave winding flat wire is used to weld the other lead-out end of another continuous wave winding flat wire to form a welded end. In one embodiment, two lead-out ends of the same continuous wave winding flat wire are used to weld two lead-out ends of two other continuous wave winding flat wires. In one embodiment, two lead-out ends of the same continuous wave winding flat wire are used to weld two lead-out ends of one other continuous wave winding flat wire. In one embodiment, the two welded lead-out ends are arranged adjacent to each other along the radial direction of the stator core.

[0011] In the embodiments of the present application, the plurality of cross-over segments of each continuous wave winding flat wire are arranged on both sides of the stator core along the axial direction of the stator core. In one embodiment, a part of the cross-over segments of each continuous wave winding flat wire are exposed on one end surface of the stator core along the axial direction of the stator core. Two ends of each cross-over segment exposed on one end surface of the stator core are connected to two straight-line segments through two connecting segments. The wire width of each connecting segment is less than the slot opening width of each winding slot along the circumferential direction of the stator core.

[0012] In one embodiment, the slot opening width of each winding slot is a first width, the slot width of each winding slot is a second width, and the wire width of each connecting segment is a third width along the circumferential direction of the stator core. The wire width of each straight-line segment or each cross-over segment is a fourth width. The first width is less than the second width, the third width is less than the first width, and the first width is less than the fourth width.

[0013] In one embodiment, the plurality of straight segments in the same winding slot are arranged along the radial direction of the stator core in sequence, and one straight segment and another straight segment are arranged in sequence along the direction away from the center hole. The distance between the one straight segment and the one end face is less than the distance between the other straight segment and the one end face.

[0014] In one embodiment, each connecting segment includes two side faces. The two side faces each include two avoiding grooves. The grooves of the two avoiding grooves face in opposite directions, and the distance between the grooves of the two avoiding grooves is less than the width of the slot opening of each winding slot.

[0015] By machining an avoiding groove in each of the two side faces of the connecting segment arranged in opposite directions along the circumferential direction of the stator core, the width of the connecting segment along the circumferential direction of the stator core can be set to be less than the width of the cross-over segment and the straight segment, thereby simplifying the processing technology of the continuous wave winding flat wire.

[0016] In one embodiment, the grooves of the two avoiding grooves in each connecting segment face in opposite directions along the circumferential direction of the stator core.

[0017] In one embodiment, the width of the groove of each avoiding groove is less than the width of the slot opening of each winding slot.

[0018] In one embodiment, the width of the groove of each avoiding groove is less than the width of the slot opening.

[0019] In one embodiment, the included angle between the groove of each avoiding groove and the one end face along the radial direction of the stator core away from the center hole is greater than 0 degrees and less than 90 degrees.

[0020] In this way, the bending angle of each cross-over segment relative to the straight segment can be reduced, thereby avoiding large bending of the cross-over segment relative to the straight segment and reducing the impact on the connection strength of the flat wire winding in the flat wire motor.

[0021] In one embodiment, the length of each avoiding groove is greater than the thickness of each straight segment and the thickness of each cross-over segment.

[0022] In one embodiment, two straight segments are arranged in sequence in the same winding slot along the radial direction of the stator core away from the center hole, and the distance between the avoiding groove of the one connecting segment connected to one of the two straight segments and the one end face is less than the distance between the other avoiding groove of the other connecting segment connected to the other of the two straight segments and the one end face.

[0023] In one embodiment, a plurality of straight segments are arranged in sequence in the same winding slot along the radial direction of the stator core, and the distance between the plurality of avoiding grooves of the plurality of connecting segments connected to the plurality of straight segments and the one end face increases in sequence along the direction away from the center hole.

[0024] In one embodiment, the other end of the other partial cross-over section and the two lead-out ends of each continuous wave winding protrude from the other end surface of the stator core along the axial direction of the stator core, and the two ends of each of the other partial cross-over sections are directly connected to the two straight sections respectively.

[0025] In one embodiment, one lead-out end of each continuous wave winding is used to weld the other lead-out end of another continuous wave winding to form a welding end, the two lead-out ends of each welding end are arranged adjacent to each other along the radial direction of the stator core, and the distance between each welding end and the other end surface along the axial direction of the stator core is greater than the distance between each of the other partial cross-over sections and the other end surface.

[0026] In one embodiment, each winding slot includes two slot walls arranged opposite to each other along the circumferential direction of the stator core, each slot wall includes a first section and a second section, and the first section and the second section of each slot wall are arranged in sequence along the radial direction of the stator core away from the central hole. The first section of each slot wall in each winding slot is bent towards the other slot wall, and the distance between the two first sections in each winding slot is less than the distance between the two second sections.

[0027] In the flat wire motor provided by the embodiments of the present application, the winding slots in the stator core of the motor stator adopt narrow slot openings, the connection sections or avoidance grooves are arranged at the connection positions between each cross-over section and the straight section of each continuous wave winding in the stator winding, thereby forming narrow waist sections, and the narrow waist sections of the continuous wave winding are used to avoid the narrow slot openings of the stator core, thereby achieving the assembly of the continuous wave winding into the plurality of winding slots of the stator core along the axial direction of the stator core. In the flat wire motor provided by the embodiments of the present application, not only the slot openings of the winding slots do not need to be widened, but also the continuous wave winding can be assembled along the axial direction of the stator core, which not only improves the assembly efficiency of the motor stator, but also takes into account the NVH performance of the flat wire motor.

[0028] In the flat wire motor provided by the embodiments of the present application, the straight sections and the plurality of cross-over sections are formed before the continuous wave winding is inserted into the stator core. Compared with the manufacturing process in the prior art, in which the cross-over sections are formed by twisting or bending during the process of inserting the continuous wave winding into the stator core, the height of the stator winding exposed from the two ends of the stator core can be reduced by 5-10 mm. Accordingly, not only the assembly efficiency of the motor stator and the manufacturing cost of the stator winding can be improved, but also the axial size of the flat wire motor can be reduced. Furthermore, not only the assembly efficiency of the stator winding can be improved, but also the manufacturing cost of the stator winding can be reduced. The structural design of the flat wire motor 400 can avoid the abrasion and deformation of the stator winding 412 during the process of inserting the stator winding 412 into the stator core 411, thereby improving the rotating speed and peak power of the flat wire motor 400, and being beneficial to improving the power performance of the power assembly 10.

[0029] The embodiment of the present application provides a power assembly. The power assembly provided by the embodiment of the present application comprises a reducer and the flat wire motor provided by the embodiment of the present application. The motor shaft of the flat wire motor is used for transmission connection of the input shaft of the reducer.

[0030] The embodiment of the present application provides an electric vehicle. The electric vehicle provided by the embodiment of the present application comprises a wheel, a transmission mechanism and the power assembly provided by the embodiment of the present application. The power assembly is used for driving the wheel through the transmission mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0031] Fig. 1 is a schematic diagram of an electric vehicle provided by the embodiment of the present application.

[0032] Fig. 2 is another schematic diagram of an electric vehicle provided by the embodiment of the present application.

[0033] Fig. 3 is a schematic diagram of a flat wire motor provided by the embodiment of the present application.

[0034] Fig. 4 is a schematic diagram of a stator core in a motor stator of a flat wire motor provided by the embodiment of the present application.

[0035] Fig. 5 is a schematic diagram of part A of the stator core shown in Fig. 4.

[0036] Fig. 6 is a schematic diagram of a continuous wave winding flat wire in a stator winding of a flat wire motor in the embodiment of the present application.

[0037] Fig. 7 is a schematic diagram of a manufacturing process of a continuous wave winding flat wire in a stator winding of a flat wire motor in the embodiment of the present application.

[0038] Fig. 8 is another schematic diagram of a manufacturing process of a continuous wave winding flat wire in a stator winding of a flat wire motor in the embodiment of the present application.

[0039] Fig. 9 is another schematic diagram of a manufacturing process of a continuous wave winding flat wire in a stator winding of a flat wire motor in the embodiment of the present application.

[0040] Fig. 10 is a schematic diagram of a flat wire group in a manufacturing process of a flat wire motor provided by the embodiment of the present application.

[0041] Fig. 11 is a schematic diagram of a manufacturing process of a motor stator in a flat wire motor provided by the embodiment of the present application.

[0042] Fig. 12 is another schematic diagram of a manufacturing process of a motor stator in a flat wire motor provided by the embodiment of the present application.

[0043] Fig. 13 is another schematic diagram of a manufacturing process of a motor stator in a flat wire motor provided by the embodiment of the present application.

[0044] Fig. 14 is a schematic diagram of a motor stator of a flat wire motor provided by the embodiment of the present application.

[0045] FIG. 15 is another schematic view of a motor stator of a flat wire motor according to an embodiment of the present application. DETAILED DESCRIPTION

[0046] The technical solutions in the present application will be described below with reference to the drawings.

[0047] The "equal / equal to" in the present application is not strictly equal / equal to, but within the error allowable range. The "parallel" is not strictly parallel, but within the error allowable range. The "perpendicular" is not strictly perpendicular, but within the error allowable range.

[0048] In the embodiments of the present application, the same reference signs represent the same components or the same parts. In the embodiments of the present application, for a plurality of identical parts, only one of the parts may be labeled with a reference sign in the drawings. The reference signs are also applicable to other identical parts or components. In addition, the sizes and dimensions of the parts shown in the drawings are only exemplary.

[0049] FIG. 1 is a schematic view of an electric vehicle according to an embodiment of the present application. As shown in FIG. 1, the electric vehicle 1 includes one or more powertrains 10, a power battery 20, and wheels 30. In one embodiment, the powertrain 10 is configured to receive power from the power battery 20 and to convert the electric power into mechanical power to drive the wheels 30 to rotate.

[0050] The electric vehicle according to the embodiments of the present application includes a pure electric vehicle, a hybrid electric vehicle, a range extended electric vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle. The pure electric vehicle is also referred to as a pure EV / battery EV. The hybrid electric vehicle is also referred to as a HEV. The range extended electric vehicle is also referred to as a REEV. The plug-in hybrid electric vehicle is also referred to as a PHEV. The new energy vehicle is also referred to as a NEV.

[0051] Fig. 2 is another schematic diagram of the electric vehicle according to an embodiment of the present application. As shown in Fig. 2, the electric vehicle comprises the power assembly 10, the power battery 20, the wheels 30 and a power supply module 40. The power supply module 40 is configured to receive power from an external power source 50 and charge the power battery 20. In one embodiment, the external power source 50 is an alternating current (AC) power grid, an AC charging pile or a direct current (DC) charging pile. The power supply module 40 comprises at least one of a DC charger or an AC charger.

[0052] In one embodiment, the power assembly 10 comprises the motor controller 300 and the flat wire motor 400. In one embodiment, the power assembly 10 comprises the motor controller 300, the flat wire motor 400 and a speed reducer 500. In one embodiment, the power assembly 10 comprises the flat wire motor 400 and the speed reducer 500.

[0053] As shown in Fig. 2, the motor controller 300 is configured to receive the DC power output by the power battery 20, convert the DC power output by the power battery 20 into AC power, and control the flat wire motor 400 to drive the wheels 30 of the electric vehicle through the speed reducer 500.

[0054] Fig. 3 is a schematic diagram of the flat wire motor according to an embodiment of the present application. As shown in Fig. 3, the flat wire motor 400 comprises a motor stator 410, a motor rotor 420 and a motor shaft 430. The motor stator 410 is configured to accommodate the motor rotor 420, and the motor rotor 420 is configured to be in transmission connection with the motor shaft 430. During the operation of the flat wire motor 400 controlled by the motor controller 300, the motor rotor 420 rotates relative to the motor stator 410, and the motor rotor 420 drives the motor shaft 430 to rotate.

[0055] In the embodiment of the present application, the motor stator 410 of the flat wire motor 400 comprises a stator core 411 and a stator winding 412. The stator core 411 is configured to wind the stator winding 412. The stator winding 412 is configured to receive the AC power provided by the motor controller 300.

[0056] Fig. 4 is a schematic diagram of the stator core in the motor stator of the flat wire motor according to an embodiment of the present application. As shown in Fig. 4, the stator core 411 comprises two end faces S1 and S2. The two end faces S1 and S2 are opposite along the axial direction of the stator core 411.

[0057] In the embodiment of the present application, the axial direction of the stator core 411 can be understood as the axial direction of the flat wire motor 400, the axial direction of the motor shaft 430 in the flat wire motor 400, or the axial direction of the motor stator 410.

[0058] In the embodiments of the present application, the radial direction of the stator core 411 can be understood as the radial direction of the flat motor 400, the radial direction of the motor shaft 430 in the flat motor 400, and the radial direction of the motor stator 410.

[0059] In the embodiments of the present application, the circumferential direction of the stator core 411 can be understood as the circumferential direction of the flat motor 400, the circumferential direction of the motor shaft 430 in the flat motor 400, and the circumferential direction of the motor stator 410. The circumferential direction can be understood as the circumferential direction.

[0060] In the embodiments of the present application, the height of the two ends of the stator core 411 can be understood as the height of the plurality of cross sections 122 along the axial direction of the stator core 411.

[0061] As shown in FIG. 4, the stator core 411 includes a central hole CH. The central hole CH is used to accommodate the motor rotor 420. Along the axial direction of the stator core 411, the central hole CH of the stator core 411 penetrates the two end surfaces S1 and S2 of the stator core 411.

[0062] In one embodiment, the stator core 411 further includes an inner circumferential surface S3 and an outer circumferential surface S4, and the inner circumferential surface S3 and the outer circumferential surface S4 are arranged opposite to each other along the radial direction of the stator core 411. The inner circumferential surface S3 of the stator core 411 is the hole wall of the central hole CH.

[0063] As shown in FIG. 4, the stator core 411 includes a plurality of winding slots G. Each winding slot G penetrates the two end surfaces S1 and S2 of the stator core 411 along the axial direction of the stator core 411. The plurality of winding slots G are arranged at intervals along the circumferential direction of the stator core 411. Along the radial direction of the stator core 411, each winding slot G is directed towards the central hole CH of the stator core 411.

[0064] In the embodiments of the present application, each winding slot G includes a slot opening, a slot bottom, and two openings. The slot opening and the slot bottom of each winding slot G are arranged opposite to each other along the radial direction of the stator core 411. In each winding slot G, the slot opening is directed towards the central hole CH of the stator core 411, and the two openings are arranged opposite to each other along the axial direction of the stator core 411.

[0065] FIG. 5 is a schematic view of part A of the stator core shown in FIG. 4. As shown in FIG. 5, along the circumferential direction of the stator core 411, the slot opening width of each winding slot G is smaller than the slot inner width of each winding slot G. In the embodiments of the present application, the slot opening width of each winding slot G is smaller than the slot inner width of each winding slot G, so that each winding slot G in the stator core 411 forms a narrow slot opening, thereby improving the NVH performance of the motor.

[0066] The slot opening width of each winding slot G is a circumferential width of a portion of each winding slot G for communicating with the central hole CH, and the slot inner width of each winding slot G is a circumferential width of a portion of each winding slot G for accommodating the flat wire winding. For the convenience of description, the slot opening width of each winding slot G is a first width W1, and the slot inner width of each winding slot G is a second width W2. The slot inner width W2 of each winding slot G is greater than the slot opening width W1 of each winding slot G. As shown in FIG. 5, W2 is greater than W1.

[0067] As shown in FIG. 5, each winding slot G includes two slot walls H arranged oppositely along the circumference of the stator core 411. In an embodiment, each slot wall H includes a first segment slot wall H1 and a second segment slot wall H2.

[0068] In an embodiment, the first segment slot wall H1 and the second segment slot wall H2 in each slot wall H are arranged in sequence in a direction along the radial of the stator core 411 and away from the central hole CH of the stator core 411. As shown in FIG. 5, the first segment slot wall H1 is closer to the slot opening of the winding slot G than the second segment slot wall H2. As shown in FIG. 5, the interval between the two first segment slot walls H1 communicates with the central hole CH, so that each winding slot G in the stator core 411 forms a narrow slot opening, thereby improving the NVH performance of the motor.

[0069] As shown in FIG. 5, the first segment slot wall H1 in each slot wall H in each winding slot G is bent towards the other slot wall H, and the interval between the two first segment slot walls H1 in each winding slot G is smaller than the interval between the two second segment slot walls H2, so that each winding slot G in the stator core 411 forms a narrow slot opening, thereby improving the NVH performance of the motor.

[0070] As shown in FIG. 5, the minimum interval between the two first segment slot walls H1 is smaller than the minimum interval between the two second segment slot walls H2, and the slot opening width of each winding slot G is smaller than the slot inner width. Accordingly, each winding slot G includes a narrow slot opening. In the embodiment of the present application, the stator core 411 of the motor stator 410 in the flat wire motor 400 adopts the winding slot G with a narrow slot opening, thereby improving the NVH performance of the motor.

[0071] FIG. 6 is a schematic diagram of a continuous wave winding flat wire in a stator winding of a flat wire motor according to an embodiment of the present application. In the embodiment of the present application, the stator winding 412 includes a plurality of continuous wave winding flat wires 120. As shown in FIG. 6, each continuous wave winding flat wire 120 includes a plurality of straight line segments 121, a plurality of crossover segments 122a and 122b, and two lead-out ends 126.

[0072] Each straight line segment 121 is arranged in a winding slot G. The two ends of each crossover segment 122a or 122b are respectively connected to two straight line segments 121 in different winding slots G, and each lead-out end 126 is connected to a straight line segment 121.

[0073] In the embodiment of the present application, one lead-out end 126 of one continuous wave-wound flat wire 120 is used to weld another lead-out end 126 of another continuous wave-wound flat wire 120 to form a welding end. In one embodiment, two lead-out ends 126 of the same continuous wave-wound flat wire 120 are respectively used to weld two lead-out ends 126 of two other continuous wave-wound flat wires 120. In one embodiment, two lead-out ends 126 of the same continuous wave-wound flat wire 120 are respectively used to weld two lead-out ends 126 of another continuous wave-wound flat wire 120. In one embodiment, the two lead-out ends 126 that are welded together are arranged adjacent to each other along the radial direction of the stator core 411.

[0074] In one embodiment, the plurality of straight line segments 121 in each continuous wave-wound flat wire 120 are arranged in the plurality of winding slots G. In one embodiment, the plurality of crossover segments 122a are used to protrude from one end surface of the stator core 411. In one embodiment, the plurality of crossover segments 122b and the two lead-out ends 126 are used to protrude from another end surface of the stator core 411.

[0075] FIG. 7 is a schematic diagram of the manufacturing process of the continuous wave-wound flat wire in the stator winding of the flat wire motor according to an embodiment of the present application. FIG. 8 is another schematic diagram of the manufacturing process of the continuous wave-wound flat wire in the stator winding of the flat wire motor according to an embodiment of the present application.

[0076] As shown in FIG. 7, each flat wire 120 is bent according to the pre-set positioning points to form a plurality of straight line segments 121, a plurality of crossover segments 122a and 122b, and two lead-out ends 126, thereby forming a continuous wave-wound flat wire 120. As shown in FIG. 7, each flat wire 120 includes three groups of positioning points. The first group of positioning points A11-A16 are the bending points of a plurality of crossover segments 122a and straight line segments 121 of one group of crossover segments 122a of the continuous wave-wound flat wire 120, the second group of positioning points B11-B14 are the bending points of one crossover segment 122b and a straight line segment 121 of another group of crossover segments 122b of the continuous wave-wound flat wire 120, and the third group of positioning points C11-C12 are the bending points of the lead-out ends 126 and a straight line segment 121 of the continuous wave-wound flat wire 120. According to each group of positioning points, each flat wire 120 is bent to obtain a continuous wave-wound flat wire 120.

[0077] In one embodiment, the lengths of the plurality of straight line segments 121 are equal. The length of the straight line segment 121 can be understood as the dimension of the straight line segment 121 along the extension direction of the straight line segment 121. In this way, the production process of each continuous wave-wound flat wire 120 can be simplified.

[0078] As shown in FIGS. 6 and 7, each continuous wave winding flat wire 120 includes a plurality of crossover sections 122, and two ends of each crossover section 122 are used to connect two straight sections 121. Among them, along the circumferential direction of the stator core 411, the wire width of each crossover section 122 is greater than the slot opening width of each winding slot G and less than the slot inner width of each winding slot G.

[0079] In combination with FIGS. 5 and 8, the slot opening width of each winding slot G is a first width W1, the slot inner width of each winding slot G is a second width W2, and the wire width of each crossover section 122 is a fourth width W4. The third width W4 is greater than the first width W1 and less than the second width W2.

[0080] As shown in FIGS. 6 and 7, the plurality of crossover sections 122 of each continuous wave winding flat wire 120 are divided into a plurality of crossover sections 122a and a plurality of crossover sections 122b. Two ends of the same straight section 121 are used to connect one crossover section 122a and one crossover section 122b. In the embodiments of the present application, the plurality of crossover sections 122a can also be referred to as a part of the crossover sections in the continuous wave winding flat wire 120, and the plurality of crossover sections 122b can also be referred to as another part of the crossover sections in the continuous wave winding flat wire 120.

[0081] As shown in FIG. 6, each continuous wave winding flat wire 120 further includes a plurality of connection sections 123. In one embodiment, before each flat wire 120 is subjected to the bending process, a flattening die is used to process the fourth group of positioning points L1-L6 in each flat wire 120, thereby obtaining the plurality of connection sections 123 as shown in FIG. 6. Compared with processing after bending, processing using a flattening die before bending can simplify the processing difficulty.

[0082] As shown in FIGS. 6 or 7, the plurality of crossover sections 122a of each continuous wave winding flat wire 120 are arranged at intervals along the circumferential direction of the stator core 411. In one embodiment, the two straight sections 121 connected by two ends of each crossover section 122a of each continuous wave winding flat wire 120 are arranged in different layers by 1. For example, one of the two straight sections 121 connected by each crossover section 122a of each continuous wave winding flat wire 120 is arranged in the kth layer of one winding slot G, and the other of the two straight sections 121 connected by each crossover section 122a of each continuous wave winding flat wire 120 is arranged in the (k+1)th layer of another winding slot G, where k is an odd positive integer.

[0083] In one embodiment, the span of the plurality of crossover sections 122 of the same continuous wave winding flat wire 120 includes multiple types. In the embodiments of the present application, the span of each crossover section 122 refers to the distance between the two winding slots G in which the two straight sections 121 connected by two ends of each crossover section 122 are arranged.

[0084] In one embodiment, each of the cross-over segments 122a or 122b has the same length. In other words, each of the cross-over segments 122a has the same length, and each of the cross-over segments 122b has the same length. In this way, the manufacturing process of each of the continuous wave winding flat wires 120 can be simplified. In one embodiment, the number of the cross-over segments 122a is greater than the number of the cross-over segments 122b. In one embodiment, the wire width of each of the cross-over segments 122 along the circumferential direction of the stator core 411 is equal to the wire width of each of the straight segments 121, so as to simplify the manufacturing process of each of the continuous wave winding flat wires 120.

[0085] In one embodiment, two ends of one of the cross-over segments 122a are connected to two of the straight segments 121 through two of the connection segments 123 respectively. In one embodiment, two ends of one of the cross-over segments 122b are directly connected to two of the straight segments 121 respectively. As shown in FIG. 7, one end of one of the straight segments 121 is connected to one end of one of the cross-over segments 122a through one of the connection segments 123, and the other end of the one of the cross-over segments 122a is connected to the other of the straight segments 121 through the other of the connection segments 123. The other end of the one of the straight segments 121 is directly connected to one end of one of the cross-over segments 122b, and the other end of the one of the cross-over segments 122b is directly connected to the other of the straight segments 121.

[0086] As shown in FIGS. 4 and 6, along the axial direction of the stator core, a part of the cross-over segments 122a in each of the continuous wave winding flat wires is exposed to the end surface S1 of the stator core 411, and two ends of each of the cross-over segments 122a exposed to the end surface S1 of the stator core 411 are connected to two of the straight segments 121 through two of the connection segments 123 respectively. Along the circumferential direction of the stator core 411, the wire width of each of the connection segments 123 is less than the slot opening width of each of the winding slots G, and the wire width of each of the connection segments 123 is less than the wire width of each of the straight segments 121, each of the cross-over segments 122a or 122b. The wire width of each of the straight segments 121, each of the cross-over segments 122a or 122b is greater than the slot opening width of each of the winding slots G and less than the slot inner width of each of the winding slots G.

[0087] As shown in FIGS. 5 and 8, along the circumferential direction of the stator core 411, the slot opening width of each of the winding slots G is a first width W1, the slot inner width of each of the winding slots G is a second width W2, the wire width of each of the connection segments 123 is a third width W3, and the wire width of each of the straight segments 121 or each of the cross-over segments 122 is a fourth width W4. The first width W1 is less than the second width W2, the third width W3 is less than the first width W1, the first width W1 is less than the fourth width W4, and the fourth width W4 is less than the second width W2.

[0088] In one embodiment, before the bending process of each flat wire 120, the two ends D1-D2 of each flat wire 120 are subjected to a paint stripping process and a chamfering process, so as to facilitate the welding of the two lead-out ends 126. In addition, the paint stripping process and the chamfering process are performed before the bending process, which is simpler than performing the paint stripping process and the chamfering process after the bending process.

[0089] As shown in FIG. 7, the two lead-out ends 126 of each continuous wave winding flat wire 120 are distributed at the two ends of each continuous wave winding flat wire 120. In combination with FIGS. 5, 6 and 7, the two lead-out ends 126 and the plurality of cross-over sections 122b of each continuous wave winding flat wire 120 are exposed to the same end surface S2 of the stator core 411. Among them, each lead-out end 126 of each continuous wave winding flat wire 120 is connected to a cross-over section 122a through a straight section 121. In this way, the two lead-out ends 126 of each continuous wave winding flat wire 120 are distributed on different sides of the plurality of straight sections 121 of each continuous wave winding flat wire 120, and the two lead-out ends 126 of each continuous wave winding flat wire 120 are distributed on the same side of the plurality of straight sections 121 of each continuous wave winding flat wire 120.

[0090] The two lead-out ends 126 and the plurality of cross-over sections 122a of each continuous wave winding flat wire 120 are distributed on both sides of the plurality of straight sections 121 along the axial direction of the stator core 411, so as to avoid the interference of the lead-out ends 126 of the continuous wave winding flat wire 120 during the insertion of the stator core 411, thereby improving the assembly efficiency of the stator winding. In addition, the two lead-out ends 126 and the plurality of cross-over sections 122a of each continuous wave winding flat wire 120 are distributed on both sides of the plurality of straight sections 121 along the axial direction of the stator core 411, which can also reduce the height of the stator winding 412 exposed to the end surface S1 of the stator core 411, thereby reducing the axial size of the flat wire motor 400.

[0091] In addition, the lead-out ends 126 of all the continuous wave winding flat wires 120 are located on the same side of the stator core 411 along the axial direction of the stator core 411, so that the electrical connection between all the continuous wave winding flat wires 120 is relatively convenient, and the complexity of the electrical connection between all the continuous wave winding flat wires 120 is reduced. In addition, the bus bars of the stator can be centrally deployed on the same side of the stator core 411, thereby reducing the space occupancy of the stator.

[0092] In one embodiment, the lengths of the two lead-out ends 126 of each continuous wave winding flat wire 120 are equal. The length of the lead-out end 126 can be understood as the dimension of the lead-out end 126 along the extension direction of the lead-out end 126. In this way, the production process of each continuous wave winding flat wire 120 can be simplified.

[0093] In one embodiment, the straight line section 121 connected to one of the two lead-out ends 126 of the continuous wave winding flat wire 120 is arranged in a layer different from the layer in which the straight line section 121 connected to the other lead-out end 126 is arranged by one layer. For example, the straight line section 121 connected to one of the two lead-out ends 126 is arranged in the jth layer, and the straight line section 121 connected to the other lead-out end 126 is arranged in the (j+1)th layer. Here, j is an odd positive integer.

[0094] In some embodiments, the two lead-out ends 126 of each continuous wave winding flat wire 120 are arranged with a spacing in the radial direction of the stator core. The two lead-out ends 126 of each continuous wave winding flat wire 120 are arranged with a spacing in the circumferential direction of the stator core 411. In this way, the two lead-out ends 126 of each continuous wave winding flat wire 120 do not interfere with each other, and the structure of the stator core 411 is relatively compact.

[0095] In one embodiment, each connection section 123 includes two avoidance grooves 124. In the circumferential direction of the stator core 411, the grooves of the two avoidance grooves 124 face in opposite directions. In one embodiment, in the circumferential direction of the stator core 411, the spacing between the groove bottoms of the two avoidance grooves 124 in each connection section 123 is less than the groove opening width of each winding groove G. In one embodiment, the groove bottom width of each avoidance groove 124 is less than the groove opening width of each winding groove.

[0096] In one embodiment, the wire width of the connection section 123 refers to the wire width at the two avoidance grooves 124 in the connection section 123. In one embodiment, the wire width of the connection section 123 refers to the spacing between the groove bottoms of the two avoidance grooves 124 in the circumferential direction of the stator core 411.

[0097] In one embodiment, the length of each avoidance groove 124 in each connection section 123 is greater than the thickness of each straight line section 121 and each crossover section 122a in each continuous wave winding flat wire 120. As shown in FIG. 8, the length of each avoidance groove 124 is a first length L1, and the thickness of each crossover section 122a is a second length L2. Here, the first length L1 is greater than the second length L2. As shown in FIG. 8, the thickness of each straight line section 121 is a third length L3. Here, the first length L1 is greater than the third length L3.

[0098] In the embodiments of the present application, the thickness direction of each straight line section 121 refers to the direction in which the plurality of straight line sections 121 are arranged in sequence in the same winding groove G. The thickness direction of each straight line section 121 and each crossover section 122a is perpendicular to the length direction and the width direction of each straight line section 121 and each crossover section 122a.

[0099] Fig. 9 is another schematic view of the manufacturing process of the continuous wave winding flat wire of the stator winding of the flat wire motor according to an embodiment of the present application. As shown in Fig. 9, each connection section 123 includes two side surfaces R1 and R2. The two side surfaces R1 and R2 each include two avoidance grooves 124. The two avoidance grooves 124 are oppositely arranged.

[0100] By machining one avoidance groove 124 in each of the two side surfaces R1 and R2 of the connection section 123 oppositely arranged along the circumferential direction of the stator core 411, the wire width of the connection section 123 can be set to be narrower than the wire width of the crossover section 122 and the straight section 121 along the circumferential direction of the stator core 411, thus simplifying the machining process of the continuous wave winding flat wire 120.

[0101] As shown in Fig. 9, along the circumferential direction of the stator core 411, the distance between the groove bottoms of the two avoidance grooves 124 in each connection section 123 is a third width W3, and the slot opening width of each winding slot G is a first width W1. The third width W3 is smaller than the first width W1.

[0102] As shown in Fig. 9, the slot openings of the two avoidance grooves 124 in each connection section 123 are oppositely arranged along the circumferential direction of the stator core 411. The wire width of each crossover section 122a is a fourth width W4, the slot opening width of each avoidance groove 124 is a fifth width W5, and the groove bottom width of each avoidance groove 124 is a sixth width W6. The fifth width W5 is greater than the sixth width W6. Both the fifth width W5 and the sixth width W6 are smaller than the fourth width W4.

[0103] During the process of assembling the stator winding into the stator core 411, when the avoidance groove 124 of the connection section 123 is aligned with the slot opening of the winding slot G, the slot opening of the avoidance groove 124 avoids the slot opening or slot wall of the winding slot G and the hole wall of the center hole CH, preventing the continuous wave winding flat wire 120 from being deformed or worn during the assembly process.

[0104] In an embodiment, during the process of bending each flat wire 120 to form a continuous wave winding flat wire 120, the plurality of crossover sections 122a are also bent, so that each crossover section 122a forms a bending angle of 45 degrees to 90 degrees relative to the two straight sections 121 connected thereto.

[0105] As shown in Figs. 8 and 9, the bending angle of each crossover section 122a relative to one of the straight sections 121 connected thereto is a. The angle value of a is 50 degrees to 80 degrees.

[0106] In the embodiments of the present application, after each cross-over section 122a is bent relative to the two straight sections 121 connected thereto, the insertion of each continuous wave winding flat wire 120 into the stator core 411 from the other end surface S2 of the stator core 411 along the axial direction of the stator core 411 can avoid the slot opening of each winding slot G by the connecting section 123 between each cross-over section 122a and the straight section 121, thereby facilitating the insertion of the plurality of straight sections 121 in each continuous wave winding flat wire 120 into the plurality of winding slots G of the stator core 411 along the axial direction of the stator core 411, respectively.

[0107] In the embodiments of the present application, after the plurality of straight sections 121 in each continuous wave winding flat wire 120 are inserted into the plurality of winding slots G of the stator core 411, the plurality of cross-over sections 122a in each continuous wave winding flat wire 120 are exposed to one end surface S1 of the stator core 411, and the bending angle of each cross-over section 122a is corrected along the radial direction of the stator core 411 by a tool, so that the bending angle of each cross-over section 122a relative to the axis of the stator core 411 is equal to 0 degrees.

[0108] In one embodiment, the bending angle of each cross-over section 122a relative to the two straight sections 121 connected thereto is 60 degrees, which not only avoids the slot opening of each winding slot G by the connecting section 123 between each cross-over section 122a and the straight section 121, but also reduces the bending angle of each cross-over section 122a relative to the straight section 121, reduces the influence on the connection strength of the continuous wave winding flat wire 120, and reduces the processing difficulty.

[0109] In one embodiment, a plurality of continuous wave winding flat wires 120 are assembled to form a flat wire group. FIG. 10 is a schematic view of one flat wire group in the manufacturing process of a flat wire motor according to an embodiment of the present application. As shown in FIG. 10, the plurality of straight sections 121 of the plurality of continuous wave winding flat wires 120 are arranged in a ring shape. In one embodiment, as shown in the ring shape in FIG. 10, the plurality of straight sections 121 of the same continuous wave winding flat wire 120 are arranged along the circumferential direction of the ring shape, and the two straight sections 121 of different continuous wave winding flat wires 120 are arranged along the radial direction of the ring shape.

[0110] As shown in FIG. 10, the plurality of cross-over sections 122a in the plurality of continuous wave winding flat wires 120 are arranged at the same end, and the plurality of cross-over sections 122b and the plurality of lead-out ends 126 in the plurality of continuous wave winding flat wires 120 are arranged at the other end. Among them, each cross-over section 122a of the plurality of cross-over sections 122a in the plurality of continuous wave winding flat wires 120 is bent towards the axis O1 of the ring shape to form an umbrella shape. The plurality of connecting sections 123 in each continuous wave winding flat wire 120 are arranged around the axis of the umbrella shape.

[0111] In one embodiment, the flat wire groups are inserted into the stator core 411 along the axial direction of the stator core 411 from the end surface S2 of the stator core 411. FIG. 11 is another schematic diagram of the manufacturing process of the motor stator in the flat wire motor according to an embodiment of the present application. As shown in FIG. 11, the plurality of connecting segments 123 in each flat wire group are aligned with the slot openings of the plurality of winding slots G of the stator core 411 respectively, so that the plurality of straight segments 121 in each flat wire group are inserted into the plurality of winding slots G of the stator core 411 respectively from the end surface S2 of the stator core 411.

[0112] FIGS. 12 and 13 are another schematic diagram of the manufacturing process of the motor stator in the flat wire motor according to an embodiment of the present application. As shown in FIG. 12, during the movement of each flat wire group along the axial direction of the stator core 411, each connecting segment 123 is used to avoid the winding slot G of the stator core 411, so that the plurality of winding slots G can accommodate the plurality of straight segments 121, and the central hole CH can accommodate the plurality of cross segments 122a. Correspondingly, by avoiding the slot opening of the winding slot G through the connecting segment 123, not only the NVH performance can be considered, but also the abrasion and deformation of the stator winding 412 during the insertion of the stator winding 412 into the stator core 411 can be avoided, so as to improve the rotation speed and peak power of the flat wire motor 400. In addition, the plurality of cross segments 122a in each continuous wave winding flat wire 120 can be wound before being inserted into the stator core 411, so as to reduce the length of the cross segments 122a exposed to the stator core 411, thereby considering the miniaturization of the flat wire motor.

[0113] As shown in FIG. 13, the flat wire group is pulled from one side of the end surface S1 of the stator core 411, so that the plurality of straight segments 121 in the flat wire group are inserted into the plurality of winding slots G of the stator core 411 respectively, and after each first connecting segment 123 is exposed to the end surface S1 of the stator core, the bending angle of each cross segment 122a is corrected.

[0114] FIG. 14 is a schematic diagram of the motor stator of the flat wire motor according to an embodiment of the present application. In combination with FIGS. 13 and 14, during the correction of the bent plurality of cross segments 122a, the bending angle of each cross segment 122a in the bent plurality of cross segments 122a is corrected to 0 degree.

[0115] In one embodiment, the plurality of flat wire groups are inserted into the stator core 411 in sequence. Wherein, after each flat wire group is inserted into the stator core 411, the bending angle of the plurality of cross segments 122a in the inserted flat wire group is corrected, and then another flat wire group is inserted.

[0116] In one embodiment, during the process of correcting the bending angle of the plurality of cross-over sections 122a of the inserted flat wire group, the flat wire group is slightly pressed in the direction of the radial direction of the stator core 411 towards the center hole CH, so that the plurality of flat wire groups have a smaller gap in the circumferential direction of the stator core 411. After each cross-over section 122a is corrected, the plurality of flat wire groups are slightly pushed in the direction of the radial direction of the stator core 411 away from the center hole CH, so that the plurality of flat wire groups restore the original gap in the circumferential direction of the stator core 411, to correct the continuous wave flat wire 120, and improve the space factor of the stator winding.

[0117] As shown in FIG. 14, a group of cross-over sections 122a of each continuous wave flat wire 120 of the stator winding is exposed to the end surface S1 of the stator core 411 in the axial direction of the stator core 411, and another group of cross-over sections 122b and two lead-out ends 126 are exposed to the end surface S2 of the stator core 411 in the axial direction of the stator core 411. The two ends of each cross-over section 122 are respectively used to connect two straight sections 121 in different winding slots G.

[0118] In one embodiment, the plurality of straight sections 121 in the same winding slot G are arranged in the radial direction of the stator core 411 in sequence, and one straight section 121 and another straight section 121 in the plurality of straight sections 121 are arranged in sequence in the direction away from the center hole CH. The distance between the one connecting section 123 connected to the one straight section 121 and the end surface S1 is less than the distance between the other connecting section 123 connected to the other straight section 121 and the end surface S1.

[0119] FIG. 15 is another schematic view of the motor stator of the flat wire motor provided by the embodiments of the present application. As shown in FIG. 15, among the plurality of straight sections 121 arranged in the same winding slot G, the distance between the connecting section 123 connected to the end of the straight section 121 close to the center hole CH of the stator core 411 and the end surface S2 of the stator core 411 is less than the distance between the connecting section 123 connected to the end of the straight section 121 away from the center hole CH of the stator core 411 and the end surface S2 of the stator core 411.

[0120] In some embodiments, the length of each connecting section 123 is less than the length of each cross-over section 122 and the length of each straight section 121. In some embodiments, the length of each connecting section 123 is less than 1 / 5 of the length of each cross-over section 122 and 1 / 6 of the length of each straight section 121. Accordingly, on the basis of ensuring that the stator winding is arranged in the plurality of winding slots G of the stator core 411 in the axial direction of the stator core 411, the strength of each continuous wave flat wire 120 can also be ensured.

[0121] For ease of illustration, the direction away from the center hole CH along the radial direction of the stator core 411 is the x direction, and the axial direction of the stator core 411 is the Y direction. As shown in FIG. 15, the straight line segments 121a and 121b are arranged in sequence along the x direction, and the distance between the connecting segment 123 connected by the straight line segment 121a and the end surface S2 of the stator core 411 is less than the distance between the connecting segment 123 connected by the straight line segment 121b and the end surface S2 of the stator core 411.

[0122] In an embodiment, the plurality of connecting segments 123 along the radial direction of the stator core 411 are arranged in sequence with a gap, and the distance between the clearance groove 124 in the plurality of connecting segments 123 and the end surface S1 along the direction away from the center hole CH increases in sequence. As shown in FIG. 15, the distance between the clearance groove 124 in the connecting segment 123 connected by the straight line segment 121a and the end surface S2 of the stator core 411 is less than the distance between the clearance groove 124 in the connecting segment 123 connected by the straight line segment 121b and the end surface S2 of the stator core 411.

[0123] In an embodiment, the angle between each clearance groove 124 and the end surface S1 along the radial direction of the stator core 411 away from the center hole CH is greater than 0 degrees and less than 90 degrees. As shown in FIG. 15, the angle θ between each clearance groove 124 of each connecting segment 123 and the end surface S2 of the stator core 411 along the radial direction of the stator core 411 away from the center hole CH of the stator core 411 is greater than 0 degrees and less than 90 degrees.

[0124] In an embodiment, the angle between each clearance groove 124 and the end surface S1 along the radial direction of the stator core 411 away from the center hole CH is greater than 0 degrees and less than 45 degrees.

[0125] That is, the length direction of each clearance groove 124 has an angle θ relative to the thickness direction of the connecting segment 122, thereby reducing the bending angle of each cross-over segment 122a relative to the straight line segment 121, so as to avoid a large bending of the cross-over segment 122a relative to the straight line segment 121, and reduce the influence on the connection strength of the flat wire winding 410 in the flat wire motor 400.

[0126] In the flat wire motor 400 provided by the embodiment of the present application, the stator core 411 of the motor stator 410 adopts a narrow slot structure, and the connection section 123 or the avoidance slot 124 is arranged at the connection position of each continuous wave winding flat wire 120 and the straight section 121, thereby forming a narrow waist section, and the narrow waist section of the continuous wave winding flat wire 120 avoids the narrow slot of the stator core 411, and the continuous wave winding flat wire 120 is assembled into the multiple winding slots G of the stator core 411 along the axial direction of the stator core 411. In the flat wire motor 400 provided by the embodiment of the present application, the slot of the winding slot G does not need to be widened, and the continuous wave winding flat wire 120 can be assembled along the axial direction of the stator core 411, the assembly efficiency of the motor stator 410 is improved, and the NVH performance of the flat wire motor 400 is considered.

[0127] In the flat wire motor 400 provided by the embodiment of the present application, the straight section 121 and the multiple cross sections 122a and 122b are formed before the continuous wave winding flat wire 120 is inserted into the stator core 411, compared with the manufacturing process in the prior art, the continuous wave winding flat wire 120 needs to be twisted or bent to form the cross section 122a and 122b during the process of being inserted into the stator core 411, the height of the stator winding 412 exposed from the two ends of the stator core 411 can be reduced by 5-10 mm, the assembly efficiency of the motor stator 410 is improved, the manufacturing cost of the stator winding is reduced, the axial size of the flat wire motor 400 is reduced, the abrasion and deformation of the stator winding 412 during the assembly process are reduced, the rotating speed and the peak power of the flat wire motor 400 are improved.

[0128] The power assembly 10 provided by the embodiment of the present application includes the flat wire motor 400 described above, the structure of the stator winding 412 in the motor stator 410 of the flat wire motor 400 can reduce the axial size of the power assembly, which is beneficial to the miniaturization of the power assembly 10. In addition, the stator core 411 in the motor stator 410 of the flat wire motor 400 in the power assembly 10 provided by the embodiment of the present application adopts a narrow slot structure, thereby improving the NVH performance of the power assembly, which is beneficial to improving the NVH performance of the power assembly 10. In addition, the structure design of the flat wire motor 400 can avoid the abrasion and deformation of the stator winding 412 during the process of being inserted into the stator core 411, thereby improving the rotating speed and the peak power of the flat wire motor 400, and improving the power performance of the power assembly 10.

[0129] The electric vehicle provided by the embodiment of the present application includes the power assembly 10 or the flat wire motor 400 described above, the miniaturization of the power assembly 10 or the flat wire motor 400 can increase the in-vehicle space of the electric vehicle, and the improvement of the power performance and the NVH performance of the power assembly 10 or the flat wire motor 400 can also improve the driving experience of the electric vehicle.

[0130] The above description is only specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A flat wire motor, characterized by, The motor stator of the flat wire motor comprises a stator core and a stator winding, the stator core comprises a central hole and a plurality of winding slots, each winding slot and the central hole penetrate through two end faces of the stator core along the axial direction of the stator core, the central hole is used for accommodating a motor rotor of the flat wire motor, the slot opening of each winding slot faces the central hole, the stator winding comprises a plurality of continuous wave winding flat wires, each continuous wave winding flat wire comprises two lead-out ends, a plurality of straight segments and a plurality of cross segments, each straight segment is arranged in a winding slot respectively, two ends of each cross segment are used for connecting two straight segments in different winding slots respectively, and each lead-out end is used for connecting a straight segment. Along the axial direction of the stator core, a part of the cross segments in each continuous wave winding flat wire is exposed to one end face of the stator core, and two ends of each cross segment in the part of the cross segments are connected to two straight segments through two connecting segments respectively. Along the circumferential direction of the stator core, the slot opening width of each winding slot is a first width, the slot inner width of each winding slot is a second width, the wire width of each connecting segment is a third width, and the wire width of each straight segment or each cross segment is a fourth width, the third width is smaller than the first width, and the first width is smaller than the second width and the fourth width respectively.

2. The flat wire motor according to claim 1, characterized in that Along the axial direction of the stator core, another part of the cross segments and the two lead-out ends in each continuous wave winding flat wire are exposed to the other end face of the stator core, and two ends of each cross segment in the other part of the cross segments are directly connected to two straight segments respectively.

3. The flat wire motor of claim 2, wherein One lead-out end in each continuous wave winding flat wire is used for welding another lead-out end of another continuous wave winding flat wire to form a welding end, and the two adjacent lead-out ends welded along the radial direction of the stator core are arranged in sequence. Along the axial direction of the stator core, the distance between each welding end and the other end face is greater than the distance between each cross segment in the other part of the cross segments and the other end face.

4. The flat wire motor according to any one of claims 1 to 3, characterized in that A plurality of straight segments in the same winding slot are arranged in sequence along the radial direction of the stator core, one straight segment and another straight segment in the plurality of straight segments are arranged in sequence in the direction away from the central hole, and the distance between the connecting segment connected to the one straight segment and the one end face is smaller than the distance between the connecting segment connected to the other straight segment and the one end face. Each connecting segment comprises two side faces, the two side faces respectively comprise two avoiding grooves, the slot openings of the two avoiding grooves face opposite directions, and the distance between the groove bottoms of the two avoiding grooves is smaller than the slot opening width of each winding slot.

5. Flat wire motor according to any of claims 1-4, characterized in that ​ 6. The flat wire motor of claim 5, wherein Two of the straight segments are arranged in sequence in the same winding slot in a direction away from the one central hole along the radial direction of the stator core, and the distance between one of the straight segments and the one end face is smaller than the distance between the other of the straight segments and the one end face.

7. The flat wire motor of claim 5, wherein A plurality of the straight segments are arranged in sequence in the same winding slot in a direction away from the one central hole along the radial direction of the stator core, and the distance between a plurality of the avoiding slots in a plurality of the connecting segments connected by the plurality of the straight segments and the one end face increases in sequence in a direction away from the one central hole.

8. The flat wire motor of claim 5, wherein The angle between each of the avoiding slots and the one end face along the radial direction of the stator core away from the one central hole is greater than 0 degrees and less than 90 degrees.

9. The flat wire motor of claim 5, wherein, The length of each of the avoiding slots is greater than the thickness of each of the straight segments and the thickness of each of the bridging segments.

10. The flat wire motor of claim 5, wherein, The openings of the two avoiding slots in each of the connecting segments face away from each other along the circumferential direction of the stator core.

11. The flat wire motor of claim 5, wherein The bottom width of each of the avoiding slots is less than the opening width.

12. The flat wire motor of claim 5, wherein, The bottom width of each of the avoiding slots is less than the opening width of each of the winding slots.

13. Flat wire motor according to any of claims 1-12, characterized in that Each of the winding slots comprises two slot walls arranged oppositely along the circumferential direction of the stator core, each of the slot walls comprises a first segment slot wall and a second segment slot wall, and the one first segment slot wall and the one second segment slot wall in each of the slot walls are arranged in sequence in a direction away from the one central hole along the radial direction of the stator core, wherein: The first segment slot wall in each of the slot walls in each of the winding slots is curved towards the other slot wall, and the distance between the two first segment slot walls in each of the winding slots is less than the distance between the two second segment slot walls.

14. A powertrain, characterized by, The power assembly comprises a reducer and the flat wire motor as claimed in any one of claims 1-13, and the motor shaft of the flat wire motor is used for driving connection with the input shaft of the reducer.

15. An electric vehicle characterized by comprising: The electric vehicle comprises wheels, a transmission mechanism, and the power assembly as claimed in claim 14, and the power assembly is used for driving the wheels through the transmission mechanism. The electric vehicle comprises wheels, a transmission mechanism, and the power assembly as claimed in claim 14, and the power assembly is used for driving the wheels through the transmission mechanism.

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