Flat wire motor, powertrain and electric vehicle

Abstract

The application provides a flat wire motor, a power assembly and an electric vehicle. The stator of the motor comprises a stator core and a stator winding, two end faces of each winding slot and a center hole of the stator core are penetrated by the stator winding, the center hole is used for accommodating a rotor, and a slot opening of each winding slot faces the center hole. Each flat wire of the stator winding comprises two lead-out ends, a plurality of straight-line segments and a plurality of cross-link segments, each straight-line segment is arranged in a winding slot, two ends of each cross-link segment are used for connecting two straight-line segments in different winding slots, and each lead-out end is connected with a straight-line segment. Along the stator axis, a part of the cross-link segments of each flat wire is exposed to one end face, and two ends of each cross-link segment of a part of the cross-link segments are connected with two straight-line segments through two connecting segments. Along the circumference of the stator core, the wire 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 width, the wire width of each straight-line segment or the wire width of each cross-link segment.

Description

TECHNICAL FIELD

[0001] 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

[0002] 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

[0003] 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.

[0004] The present application provides a flat wire motor. In the present application, the flat wire motor comprises 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 rotates relative to the motor stator, and the motor rotor drives the motor shaft to rotate.

[0005] In the present application, the motor stator of the flat wire motor comprises 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 comprises two end faces arranged opposite to each other along the axial direction of the stator core. The stator core comprises 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 smaller than the slot inner width of each winding slot.

[0006] In the present application, 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 line segments and a plurality of cross-over segments. Each straight line segment is arranged in a winding slot. The two ends of each cross-over segment are used to connect two straight line segments in different winding slots, and each lead-out end is used to connect a 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 smaller than the slot inner width of each winding slot.

[0007] In the embodiments of the present application, the width of each cross-over section of each continuous wave winding is greater than the slot opening width of each winding slot and less than the slot width of each winding slot.

[0008] In one embodiment, the plurality of straight sections of the same continuous wave winding are arranged in different winding slots. In one embodiment, the two ends of each cross-over section of the same continuous wave winding are used to connect two straight sections in different winding slots. In one embodiment, one end of each straight section of the same continuous wave winding is used for one cross-over section or one lead end, and the other end of each straight section is used for another cross-over section or another lead end.

[0009] In the embodiments of the present application, one lead end of one continuous wave winding is used to weld the other lead end of another continuous wave winding to form a welded end. In one embodiment, two lead ends of the same continuous wave winding are used to weld two lead ends of two other continuous wave windings, respectively. In one embodiment, two lead ends of the same continuous wave winding are used to weld two lead ends of one other continuous wave winding, respectively. In one embodiment, the two lead ends welded together are arranged adjacent to each other along the radial direction of the stator core.

[0010] In the embodiments of the present application, the plurality of cross-over sections of each continuous wave winding are arranged on both sides of the stator core along the axial direction of the stator core. In one embodiment, a portion of the cross-over sections of each continuous wave winding are exposed on one end surface of the stator core along the axial direction of the stator core, and the two ends of each cross-over section exposed on the one end surface of the stator core are connected to two straight sections through two connecting sections. Along the circumferential direction of the stator core, the width of each connecting section is less than the slot opening width of each winding slot.

[0011] In one embodiment, along the circumferential direction of the stator core, 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 width of each connecting section is a third width. The width of each straight section or each cross-over section 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.

[0012] In one embodiment, the plurality of straight sections in the same winding slot are arranged in sequence along the radial direction of the stator core, and one straight section and another straight section in the plurality of straight sections are arranged in sequence along the direction away from the central hole. The distance between the one connecting section connected to the one straight section and the one end surface is less than the distance between the other connecting section connected to the other straight section and the one end surface.

[0013] In one embodiment, each connecting section includes two side surfaces. The two side surfaces include two avoiding grooves, respectively. The slot openings of the two avoiding grooves face in opposite directions, and the distance between the slot bottoms of the two avoiding grooves is less than the slot opening width of each winding slot.

[0014] By machining one avoiding slot in each of two side faces of the connecting segment arranged oppositely along the circumferential direction of the stator core, the line width of the connecting segment can be set narrower than the cross-over segment and the straight segment along the circumferential direction of the stator core, thus simplifying the processing technology of the continuous wave winding.

[0015] In one embodiment, the slot opening of the two avoiding slots in each connecting segment faces oppositely along the circumferential direction of the stator core.

[0016] In one embodiment, the slot bottom width of each avoiding slot is smaller than the slot opening width of each winding slot.

[0017] In one embodiment, the slot bottom width of each avoiding slot is smaller than the slot opening width.

[0018] In one embodiment, the included angle between each avoiding slot and one end face along the radial direction of the stator core away from the center hole is greater than 0 degrees and smaller than 90 degrees.

[0019] Thus, the bending angle of each cross-over segment relative to the straight segment can be reduced, so that the large bending of the cross-over segment relative to the straight segment can be avoided, and the influence on the connection strength of the flat wire winding in the flat wire motor is reduced.

[0020] In one embodiment, the length of each avoiding slot is greater than the thickness of each straight segment and the thickness of each cross-over segment.

[0021] In one embodiment, two straight segments are arranged in the same winding slot along the radial direction of the stator core away from the center hole, and the distance between one avoiding slot in one connecting segment connected by one straight segment and one end face is smaller than the distance between another avoiding slot in another connecting segment connected by another straight segment and one end face.

[0022] In one embodiment, a plurality of straight segments are arranged in the same winding slot along the radial direction of the stator core, and the distance between a plurality of avoiding slots in a plurality of connecting segments connected by the plurality of straight segments and one end face increases sequentially along the direction away from the center hole.

[0023] In one embodiment, another part of the cross-over segment and two lead-out ends of each continuous wave winding flat wire are exposed on another end face of the stator core along the axial direction of the stator core, and two ends of each cross-over segment in the another part of the cross-over segment are directly connected to two straight segments, respectively.

[0024] In one embodiment, one lead-out end of each continuous wave winding flat wire is used to weld another lead-out end of another continuous wave winding flat wire to form a welding end, two adjacent lead-out ends welded along the radial direction of the stator core, and the distance between each welding end and another end face along the axial direction of the stator core is greater than the distance between each cross-over segment in the another part of the cross-over segment and another end face.

[0025] 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 segment and a second segment, and the first segment and the second segment of each slot wall are arranged in sequence along the radial direction of the stator core away from the central hole. The first segment of each slot wall in each winding slot is bent towards the other slot wall, and the distance between the two first segments of each winding slot is smaller than the distance between the two second segments.

[0026] In the flat wire motor provided by the embodiment of the present application, the winding slot in the stator core of the motor stator adopts a narrow slot opening, a connecting segment or a avoiding slot is arranged at the connection between each cross-over segment and a straight segment of each continuous wave winding flat wire in the stator winding, thereby forming a narrow waist segment, so as to avoid the narrow slot opening of the stator core by the narrow waist segment of the continuous wave winding flat wire, thereby realizing the assembly of the continuous wave winding flat wire 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 embodiment of the present application, not only the slot opening of the winding slot does not need to be widened, but also the continuous wave winding flat wire 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.

[0027] In the flat wire motor provided by the embodiment of the present application, the straight segment and the plurality of cross-over segments are formed before the continuous wave winding flat wire is inserted into the stator core. Compared with the manufacturing process in the prior art, in which the cross-over segments are formed by twisting or bending during the process of inserting the continuous wave winding flat wire into the stator core, the height of the stator winding exposed from both ends of the stator core can be reduced by 5-10 mm. Accordingly, not only the assembly efficiency of the motor stator can be improved and the manufacturing cost of the stator winding can be reduced, 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.

[0028] 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 driving connection with the input shaft of the reducer.

[0029] The embodiment of the present application provides an electric vehicle. The electric vehicle provided by the embodiment of the present application comprises wheels, a transmission mechanism and the power assembly provided by the embodiment of the present application. The power assembly is used for driving the wheels through the transmission mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a schematic view of the electric vehicle provided by the embodiment of the present application.

[0031] Figure 2 Another schematic diagram of an electric vehicle is provided for embodiments of the present application.

[0032] Figure 3 A schematic diagram of a flat wire motor is provided for embodiments of the present application.

[0033] Figure 4 A schematic diagram of a stator core in a motor stator of a flat wire motor is provided for embodiments of the present application.

[0034] Figure 5 A schematic diagram of a portion of a stator core is shown. Figure 4

[0035] Figure 6 A schematic diagram of a continuous wave winding flat wire in a stator winding of a flat wire motor is provided for embodiments of the present application.

[0036] Figure 7 A schematic diagram of a manufacturing process for a continuous wave winding flat wire in a stator winding of a flat wire motor is provided for embodiments of the present application.

[0037] Figure 8 Another schematic diagram of a manufacturing process for a continuous wave winding flat wire in a stator winding of a flat wire motor is provided for embodiments of the present application.

[0038] Figure 9 Another schematic diagram of a manufacturing process for a continuous wave winding flat wire in a stator winding of a flat wire motor is provided for embodiments of the present application.

[0039] Figure 10 A schematic diagram of a flat wire group in a manufacturing process for a flat wire motor is provided for embodiments of the present application.

[0040] Figure 11 A schematic diagram of a manufacturing process for a motor stator in a flat wire motor is provided for embodiments of the present application.

[0041] Figure 12 Another schematic diagram of a manufacturing process for a motor stator in a flat wire motor is provided for embodiments of the present application.

[0042] Figure 13 Another schematic diagram of a manufacturing process for a motor stator in a flat wire motor is provided for embodiments of the present application.

[0043] Figure 14 A schematic diagram of a motor stator of a flat wire motor is provided for embodiments of the present application.

[0044] Figure 15 Another schematic diagram of a motor stator of a flat wire motor is provided for embodiments of the present application. DETAILED DESCRIPTION

[0045] ​The technical solutions in the present application will be described below with reference to the drawings.

[0046] In the present application, "equal / equal to" is not strictly equal / equal to, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. "Vertical" is not strictly vertical, but within the allowable error range.

[0047] 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.

[0048] Figure 1 A schematic diagram of an electric vehicle is provided in the embodiments of the present application. As shown in Figure 1 The electric vehicle 1 includes one or more powertrains 10, a power battery 20, and wheels 30. In an embodiment, the powertrain 10 is configured to receive power from the power battery 20 and convert the electric energy into mechanical energy to drive the wheels 30 to rotate.

[0049] The electric vehicle provided in 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, etc. The pure electric vehicle is also referred to as a pure electric vehicle / battery electric vehicle, or simply a pure EV / battery EV. The hybrid electric vehicle is also referred to as a hybrid electric vehicle, or simply an HEV. The range extended electric vehicle is also referred to as a range extended electric vehicle, or simply an REEV. The plug-in hybrid electric vehicle is also referred to as a plug-in hybrid electric vehicle, or simply a PHEV. The new energy vehicle is also referred to as a new energy vehicle, or simply a NEV.

[0050] Figure 2 Another schematic diagram of an electric vehicle is provided in the embodiments of the present application. As shown in Figure 2As shown, in addition to the powertrain 10, power battery 20, and wheels 30 described above, the electric vehicle also includes a power module 40. The power module 40 receives power from an external power source 50 to charge the power battery 20. In one embodiment, the external power source 50 is an AC power grid, an AC charging station, or a DC charging station. The power module 40 includes at least one of a DC charger or an AC charger.

[0051] In one embodiment, the powertrain 10 includes a motor controller 300 and a flat-wire motor 400. In another embodiment, the powertrain 10 includes a motor controller 300, a flat-wire motor 400, and a speed reducer 500. In yet another embodiment, the powertrain 10 includes a flat-wire motor 400 and a speed reducer 500.

[0052] like Figure 2 As shown, the motor controller 300 is used to receive the DC power output from the power battery 20, convert the DC power output from 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 reducer 500.

[0053] Figure 3 This is a schematic diagram of a flat wire motor provided in an embodiment of this application. Figure 3 As shown, the flat wire motor 400 includes a motor stator 410, a motor rotor 420, and a motor shaft 430. The motor stator 410 houses the motor rotor 420, which is used to drive the motor shaft 430. During operation of the flat wire motor 400, controlled by the motor controller 300, the motor rotor 420 rotates relative to the motor stator 410, driving the motor shaft 430 to rotate.

[0054] In this embodiment, the stator 410 of the flat wire motor 400 includes a stator core 411 and a stator winding 412. The stator core 411 is used to wind the stator winding 412. The stator winding 412 is used to receive AC power provided by the motor controller 300.

[0055] Figure 4 This is a schematic diagram of the stator core in the stator of a flat wire motor provided in an embodiment of this application. For example... Figure 4 As shown, the stator core 411 includes two end faces S1 and S2. The two end faces S1 and S2 are opposite to each other along the axial direction of the stator core 411.

[0056] In this embodiment, 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, and the axial direction of the motor stator 410.

[0057] In this embodiment, the radial direction of the stator core 411 can be understood as the radial direction of the flat wire motor 400, the radial direction of the motor shaft 430 in the flat wire motor 400, and the radial direction of the motor stator 410.

[0058] In this embodiment, the circumferential direction of the stator core 411 can be understood as the circumferential direction of the flat wire motor 400, the circumferential direction of the motor shaft 430 in the flat wire motor 400, and the circumferential direction of the motor stator 410. The circumferential direction can be understood as the circumferential direction.

[0059] In this embodiment of the application, the height of both ends of the stator core 411 can be understood as the height of the multiple bridging segments 122 along the axial direction of the stator core 411.

[0060] like Figure 4 As shown, 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 passes through the two end faces S1 and S2 of the stator core 411.

[0061] In one embodiment, the stator core 411 further includes an inner circumferential surface S3 and an outer circumferential surface S4, which 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 wall of the central hole CH.

[0062] like Figure 4 As shown, the stator core 411 includes multiple winding slots G. Each winding slot G extends axially through two end faces S1 and S2 of the stator core 411. The multiple winding slots G are arranged at circumferential intervals along the stator core 411. Radially, each winding slot G faces the center hole CH of the stator core 411.

[0063] In this embodiment, each winding slot G includes a slot opening, a slot bottom, and two openings. The slot opening and slot bottom of each winding slot G are arranged opposite each other radially along the stator core 411. In each winding slot G, the slot opening faces the center hole CH of the stator core 411, and the two openings are arranged opposite each other axially along the stator core 411.

[0064] Figure 5 for Figure 4 A schematic diagram of part A of the stator core shown. (See diagram below.) Figure 5 As shown, along the circumference 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 this embodiment of the application, the slot opening width of each winding slot G is smaller than the slot inner width of each winding slot G, thereby making each winding slot G in the stator core 411 form a narrow slot opening, thereby improving the NVH performance of the motor.

[0065] wherein a slot opening width of each of the winding slots G is a circumferential width of a portion of each of the winding slots G for communicating with the central hole CH, and an inner slot width of each of the winding slots G is a circumferential width of a portion of each of the winding slots G for accommodating the flat wire winding. For ease of illustration, the slot opening width of each of the winding slots G is a first width W1, and the inner slot width of each of the winding slots G is a second width W2, and the inner slot width W2 of each of the winding slots G is greater than the slot opening width W1 of each of the winding slots G. As shown in FIG. 4, W2 is greater than W1. Figure 5 As shown in FIG. 4, W2 is greater than W1.

[0066] As shown in FIG. 4, each of the winding slots G includes two slot walls H arranged opposite to each other in the circumferential direction of the stator core 411. In an embodiment, each of the slot walls H includes a first segment slot wall H1 and a second segment slot wall H2. Figure 5

[0067] In an embodiment, the first segment slot wall H1 and the second segment slot wall H2 of each of the slot walls H are arranged in sequence in the direction of the stator core 411 radially away from the central hole CH of the stator core 411. As shown in FIG. 4, the first segment slot wall H1 is closer to the slot opening of the winding slot G relative to the second segment slot wall H2. As shown in FIG. 4, the interval between the two first segment slot walls H1 communicates with the central hole CH, so that each of the winding slots G in the stator core 411 forms a narrow slot opening, thereby improving the NVH performance of the motor. Figure 5 Figure 5

[0068] As shown in FIG. 4, the first segment slot wall H1 in each of the slot walls H in each of the winding slots G is bent towards the other slot wall H, and the interval between the two first segment slot walls H1 in each of the winding slots G is less than the interval between the two second segment slot walls H2, so that each of the winding slots G in the stator core 411 forms a narrow slot opening, thereby improving the NVH performance of the motor. Figure 5

[0069] As shown in FIG. 4, the minimum interval between the two first segment slot walls H1 is less than the minimum interval between the two second segment slot walls H2, and the slot opening width of each of the winding slots G is less than the inner slot width. Correspondingly, each of the winding slots 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. Figure 5

[0070] FIG. 5 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. 5, each of the continuous wave winding flat wires 120 includes a plurality of straight line segments 121, a plurality of crossover segments 122a and 122b, and two lead-out ends 126. Figure 6 Figure 6

[0071] ​​​​​​Each straight section 121 is arranged in one winding slot G. Two ends of each cross section 122a or 122b are connected to two straight sections 121 in different winding slots G, and each lead end 126 is connected to one straight section 121.

[0072] In the embodiment, one lead end 126 of one continuous wave winding flat wire 120 is welded to another lead end 126 of another continuous wave winding flat wire 120 to form a welding end. In one embodiment, two lead ends 126 of one continuous wave winding flat wire 120 are welded to two lead ends 126 of two other continuous wave winding flat wires 120 respectively. In one embodiment, two lead ends 126 of one continuous wave winding flat wire 120 are welded to two lead ends 126 of one other continuous wave winding flat wire 120 respectively. In one embodiment, the two welded lead ends 126 are arranged adjacent to each other along the radial direction of the stator core 411.

[0073] In one embodiment, the plurality of straight sections 121 in each continuous wave winding flat wire 120 are arranged in the plurality of winding slots G. In one embodiment, the plurality of cross sections 122a are exposed on one end surface of the stator core 411. In one embodiment, the plurality of cross sections 122b and the two lead ends 126 are exposed on another end surface of the stator core 411.

[0074] Figure 7 A schematic diagram of the manufacturing process of the continuous wave winding flat wire in the stator winding of the flat wire motor in the embodiment. Figure 8 Another schematic diagram of the manufacturing process of the continuous wave winding flat wire in the stator winding of the flat wire motor in the embodiment.

[0075] As shown in Figure 7 , each flat wire 120 is bent to form a plurality of straight sections 121, a plurality of cross sections 122a and 122b, and two lead ends 126 according to the pre-set positioning points, thereby forming one continuous wave winding flat wire 120. As shown in Figure 7 , each flat wire 120 includes three groups of positioning points. Among them, the first group of positioning points A11-A16 are the bending points of the plurality of cross sections 122a and the straight sections 121 of one group of cross sections 122a of the continuous wave winding flat wire 120, the second group of positioning points B11-B14 are the bending points of one cross section 122b and the straight section 121 of another group of cross sections 122b of the continuous wave winding flat wire 120, and the third group of positioning points C11-C12 are the bending points of the lead end 126 and the straight section 121 of the continuous wave winding flat wire 120. According to each group of positioning points, each flat wire 120 is bent to obtain one continuous wave winding flat wire 120.

[0076] In an embodiment, the plurality of straight sections 121 have equal lengths. The length of a straight section 121 can be understood as the dimension of the straight section 121 along the extension direction of the straight section 121. In this way, the production process of each continuous wave winding flat wire 120 can be simplified.

[0077] As shown in Figure 6 and Figure 7 , each continuous wave winding flat wire 120 includes a plurality of crossover sections 122, and each crossover section 122 has two ends for connecting 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 width of each winding slot G.

[0078] As shown in Figure 5 and Figure 8 , the slot opening width of each winding slot G is a first width W1, the slot 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.

[0079] As shown in Figure 6 and Figure 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. The 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.

[0080] As shown in Figure 6 , each continuous wave winding flat wire 120 further includes a plurality of connection sections 123. In an embodiment, before each flat wire 120 is subjected to a bending process, a flattening die is used to process the fourth group of positioning points L1-L6 in each flat wire 120, so as to obtain a plurality of connection sections 123 as shown in Figure 6 . Processing using a flattening die before bending can simplify the processing difficulty compared to processing using a flattening die after bending.

[0081] As shown in Figure 6 or Figure 7As shown, the plurality of cross-over 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 at the two ends of each cross-over section 122a of each continuous wave winding flat wire 120 are arranged at different layers. For example, one of the two straight sections 121 connected at the two ends of each cross-over section 122a of each continuous wave winding flat wire 120 is arranged at the kth layer of one winding slot G, and the other of the two straight sections 121 connected at the two ends of each cross-over section 122a of each continuous wave winding flat wire 120 is arranged at the (k+1)th layer of another winding slot G, where k is an odd positive integer.

[0082] In one embodiment, the plurality of cross-over sections 122 of the same continuous wave winding flat wire 120 include a plurality of spans. In the embodiment of the present application, the span of each cross-over section 122 refers to the distance between the two winding slots G in which the two straight sections 121 connected at the two ends of each cross-over section 122 are arranged.

[0083] In one embodiment, the length of each cross-over section 122a or 122b is equal. In other words, the length of each cross-over section 122a is equal, and the length of each cross-over section 122b is equal. In this way, the production process of each continuous wave winding flat wire 120 can be simplified. In one embodiment, the number of cross-over sections 122a is greater than the number of cross-over sections 122b. In one embodiment, the wire width of each cross-over section 122 along the circumferential direction of the stator core 411 is equal to the wire width of each straight section 121, thereby simplifying the production process of each continuous wave winding flat wire 120.

[0084] In one embodiment, the two ends of one cross-over section 122a are connected to the two straight sections 121 through two connection sections 123. In one embodiment, the two ends of one cross-over section 122b are directly connected to the two straight sections 121. As shown, Figure 7 As shown, one end of one straight section 121 is connected to one end of one cross-over section 122a through one connection section 123, and the other end of one cross-over section 122a is connected to the other end of the other straight section 121 through the other connection section 123. The other end of one straight section 121 is directly connected to one end of one cross-over section 122b, and the other end of one cross-over section 122b is directly connected to the other end of the other straight section 121.

[0085] In combination with Figure 4 and Figure 6As shown, along the axial direction of the stator core, a portion of the bridging segment 122a in each continuous wave-wound flat wire protrudes from the end face S1 of the stator core 411. Each bridging segment 122a protruding from the end face S1 of the stator core 411 has two straight segments 121 connected at both ends by two connecting segments 123. Along the circumferential direction of the stator core 411, the line width of each connecting segment 123 is smaller than the slot opening width of each winding slot G, and the line width of each connecting segment 123 is smaller than the line width of each straight segment 121 and each bridging segment 122a or 122b. The line width of each straight segment 121 and each bridging segment 122a or 122b is greater than the slot opening width of each winding slot G and smaller than the slot inner width of each winding slot G.

[0086] Combination Figure 5 and Figure 8 As shown, along the circumference of the stator core 411, 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, the line width of each connecting segment 123 is a third width W3, and the line width of each straight segment 121 or each bridging segment 122 is a fourth width W4. Wherein, 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.

[0087] In one embodiment, before bending each flat wire 120, the two ends D1 to D2 of each flat wire 120 are stripped of their paint and chamfered to facilitate the welding of the two leads 126. Furthermore, performing the stripping and chamfering before bending simplifies the manufacturing process compared to performing these processes after bending.

[0088] like Figure 7 As shown, each continuous wave-wound flat wire 120 has two leads 126 distributed at both ends of the continuous wave-wound flat wire 120. Combined with... Figure 5 , Figure 6 and Figure 7 As shown, in each continuous wave-wound flat wire 120, two leads 126 and multiple bridging segments 122b are exposed on the same end face S2 of the stator core 411. Each lead 126 in each continuous wave-wound flat wire 120 is connected to a bridging segment 122a via a straight segment 121. Thus, the two leads 126 and a set of bridging segments 122a of each continuous wave-wound flat wire 120 are distributed on different sides of the multiple straight segments 121 of each continuous wave-wound flat wire 120, while the two leads 126 and another set of bridging segments 122b of each continuous wave-wound flat wire 120 are distributed on the same side of the multiple straight segments 121 of each continuous wave-wound flat wire 120.

[0089] 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 interference caused by the lead-out ends 126 during insertion of the continuous wave winding flat wire 120 into 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.

[0090] 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.

[0091] In an 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.

[0092] In an embodiment, the straight section 121 connected by one of the two lead-out ends 126 of each continuous wave winding flat wire 120 is located on a layer different by 1 from the layer on which the straight section 121 connected by the other lead-out end 126 is located. For example, the layer on which the straight section 121 connected by one lead-out end 126 is located is the jth layer, and the layer on which the straight section 121 connected by the other lead-out end 126 is located is the (j+1)th layer. Wherein, j is an odd positive number.

[0093] In some embodiments, the two lead-out ends 126 of each continuous wave winding flat wire 120 are arranged with a spacing along the radial direction of the stator core. The two lead-out ends 126 of each continuous wave winding flat wire 120 have a spacing along 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 can be more compact.

[0094] In an embodiment, each connection section 123 includes two avoidance grooves 124. Along the circumferential direction of the stator core 411, the openings of the two avoidance grooves 124 face in opposite directions. In an embodiment, along 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 opening width of each winding groove G. In an embodiment, the groove bottom width of each avoidance groove 124 is less than the opening width of each winding groove.

[0095] In an embodiment, the line width of the connection section 123 refers to the line width at the two relief grooves 124 in the connection section 123. In an embodiment, the line width of the connection section 123 refers to the distance between the bottoms of the two relief grooves 124 along the circumferential direction of the stator core 411.

[0096] In an embodiment, the length of each relief groove 124 in each connection section 123 is greater than the thickness of each straight section 121 and each crossover section 122a in each continuous wave winding flat wire 120. As shown in Figure 8 , the length of each relief groove 124 is a first length L1, and the thickness of each crossover section 122a is a second length L2. Wherein the first length L1 is greater than the second length L2. As shown in Figure 8 , the thickness of each straight section 121 is a third length L3. Wherein the first length L1 is greater than the third length L3.

[0097] In an embodiment of the present application, the thickness direction of each straight section 121 refers to the direction in which the plurality of straight sections 121 in the same winding slot G are arranged in sequence. The thickness direction of each straight section 121 and each crossover section 122a is perpendicular to the length direction and the width direction of each straight section 121 and each crossover section 122a.

[0098] Figure 9 Another schematic diagram of the manufacturing process of the continuous wave winding flat wire in the stator winding of the flat wire motor in an embodiment of the present application. As shown in Figure 9 , each connection section 123 includes two side surfaces R1 and R2. Wherein the two side surfaces R1 and R2 respectively include two relief grooves 124. The two relief grooves 124 have opposite openings.

[0099] By machining one relief groove 124 in each of the two side surfaces R1-R2 of the connection section 123 arranged in opposite directions along the circumferential direction of the stator core 411, the line width of the connection section 123 can be set to be narrower than the crossover section 122 and the straight section 121 along the circumferential direction of the stator core 411. In this way, the manufacturing process of the continuous wave winding flat wire 120 is simplified.

[0100] As shown in Figure 9 , along the circumferential direction of the stator core 411, the distance between the bottoms of the two relief grooves 124 in each connection section 123 is a third width W3, and the opening width of each winding slot G is a first width W1. Wherein the third width W3 is less than the first width W1.

[0101] As shown in Figure 9As shown, the slot opening of each of the two avoiding grooves 124 in the connecting segment 123 faces in opposite directions along the circumference of the stator core 411. The line width of each of the cross-connection segments 122a is a fourth width W4, the slot opening width of each of the avoiding grooves 124 is a fifth width W5, and the slot bottom width of each of the avoiding grooves 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 less than the fourth width W4.

[0102] In the process of assembling the stator winding into the stator core 411, when the avoiding grooves 124 of the connecting segment 123 are aligned with the slot opening of the winding slot G, the slot opening of the avoiding 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.

[0103] In an embodiment, in the process of bending each flat wire 120 to form a continuous wave winding flat wire 120, the plurality of cross-connection segments 122a are also bent, so that each cross-connection segment 122a forms a bending angle of 45 degrees to 90 degrees relative to the two straight segments 121 connected thereto.

[0104] As shown in Figure 8 and Figure 9 , the bending angle of each cross-connection segment 122a relative to one of the straight segments 121 connected thereto is a. The angle value of a is 50 degrees to 80 degrees.

[0105] In the embodiments of the present application, after each cross-connection segment 122a is bent relative to the two straight segments 121 connected thereto, each continuous wave winding flat wire 120 can be inserted along the axial direction of the stator core 411 from the other end surface S2 of the stator core 411, and the connecting segment 123 between each cross-connection segment 122a and the straight segment 121 avoids the slot opening of each winding slot G, thereby facilitating the insertion of the plurality of straight segments 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.

[0106] In the embodiments of the present application, after the plurality of straight segments 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-connection segments 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-connection segment 122a is corrected along the radial direction of the stator core 411 by a tool, so that the bending angle of each cross-connection segment 122a relative to the axis of the stator core 411 is equal to 0 degrees.

[0107] In one embodiment, the bending angle formed by each bridging segment 122a relative to the two straight segments 121 it connects to is 60 degrees. This not only allows the connecting segment 123 between each bridging segment 122a and the straight segment 121 to avoid the slot opening of each winding slot G, but also reduces the bending angle of each bridging segment 122a relative to the straight segment 121, reduces the impact on the connection strength of the continuous wave wound flat wire 120, and reduces the processing difficulty.

[0108] In one embodiment, multiple continuous wave-wound flat wires 120 are assembled to form a flat wire group. Figure 10 This is a schematic diagram of a flat wire assembly during the manufacturing process of a flat wire motor, as provided in an embodiment of this application. Figure 10 As shown, multiple connected wave-shaped lines are arranged at intervals around multiple straight line segments 121 of the flat wire 120 to form a ring. In one embodiment, as... Figure 10 In the ring shown, multiple straight segments 121 of the same connecting wave around the flat line 120 are arranged circumferentially along the ring, while two straight segments 121 of two different connecting waves around the flat line 120 are arranged radially along the ring.

[0109] like Figure 10 As shown, multiple bridging segments 122a of multiple continuous wave-wound flat wires 120 are arranged at the same end, and multiple bridging segments 122b and multiple lead-out ends 126 of multiple connecting wave-wound flat wires 120 are arranged at the other end. Each bridging segment 122a of the multiple connecting wave-wound flat wires 120 is bent towards the annular axis O1 to form an umbrella shape. Multiple connecting segments 123 of each continuous wave-wound flat wire 120 are arranged around the axis of the umbrella shape.

[0110] In one embodiment, a flat wire assembly is inserted into the stator core 411 from the end face S2 along the axial direction of the stator core 411. Figure 11 This is another schematic diagram illustrating the manufacturing process of the motor stator in the flat wire motor provided in this application embodiment. For example... Figure 11 As shown, multiple connecting segments 123 in the flat wire group are respectively aligned with the slots of multiple winding slots G of the stator core 411, so that multiple straight segments 121 in each flat wire group are respectively inserted into the multiple winding slots G of the stator core 411 from the end face S2 of the stator core 411.

[0111] Figure 12 and Figure 13 This is another schematic diagram illustrating the manufacturing process of the motor stator in the flat wire motor provided in this application embodiment. For example... Figure 12As shown, each connecting segment 123 is used to avoid one winding slot G of the stator core 411 during the axial movement of each flat wire group along the stator core 411, so that the plurality of winding slots G can accommodate the plurality of straight line segments 121, and the central hole CH can accommodate the plurality of cross-over 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 wear and deformation of the stator winding 412 caused by the insertion of the stator winding 412 into the stator core 411 can be avoided, thereby improving the rotation speed and peak power of the flat wire motor 400. In addition, the plurality of cross-over segments 122a in each continuous wave winding flat wire 120 can be wound before being inserted into the stator core 411, which can reduce the length of the cross-over segment 122a exposed to the stator core 411, thereby considering the miniaturization of the flat wire motor.

[0112] As shown in Figure 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 line 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-over segment 122a is corrected.

[0113] Figure 14 A schematic diagram of a motor stator of a flat wire motor is provided for the embodiments of the present application. As shown in Figure 13 and Figure 14 , during the correction of the bent plurality of cross-over segments 122a, the bending angle of each cross-over segment 122a in the bent plurality of cross-over segments 122a is corrected to 0 degrees.

[0114] In an embodiment, the plurality of flat wire groups are sequentially inserted into the stator core 411. Wherein, after each flat wire group is inserted into the stator core 411, the bending angle of the plurality of cross-over segments 122a in the inserted flat wire group is corrected, and then another flat wire group is inserted.

[0115] In an embodiment, during the correction of the bending angle of the plurality of cross-over segments 122a in the inserted flat wire group, the flat wire group is slightly extruded in the direction of the central hole CH along the radial direction of the stator core 411, so that the plurality of flat wire groups have a small gap along the circumferential direction of the stator core 411. After each bent cross-over segment 122a is corrected, the plurality of flat wire groups are slightly pushed in the direction away from the central hole CH along the radial direction of the stator core 411, so that the gap of the plurality of flat wire groups along the circumferential direction of the stator core 411 returns to the original state, to correct the flat continuous wave winding flat wire 120 and improve the space factor of the stator winding.

[0116] As shown in Figure 14As shown, a group of cross-over sections 122a of each continuous wave winding flat wire 120 in 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.

[0117] In an embodiment, the plurality of straight sections 121 in the same winding slot G are arranged in sequence in the radial direction of the stator core 411, 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 central hole CH. Among them, the distance between one connecting section 123 connected by one straight section 121 and one end surface S1 is less than the distance between another connecting section 123 connected by another straight section 121 and one end surface S1.

[0118] Figure 15 Another schematic diagram of the motor stator of the flat wire motor provided by the embodiment of the present application is provided. As shown in Figure 15 Among the plurality of straight sections 121 arranged in the same winding slot G, the distance between the connecting section 123 connected by one end of the straight section 121 close to the central 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 by one end of the straight section 121 away from the central hole CH of the stator core 411 and the end surface S2 of the stator core 411.

[0119] 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 loaded into 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 winding flat wire 120 can also be ensured.

[0120] For ease of description, the direction away from the central hole CH in 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 Figure 15 In the x direction, the straight section 121a and the straight section 121b are arranged in sequence, and the distance between the connecting section 123 connected by the straight section 121a and the end surface S2 of the stator core 411 is less than the distance between the connecting section 123 connected by the straight section 121b and the end surface S2 of the stator core 411.

[0121] In an embodiment, a plurality of connecting sections 123 are arranged in sequence and spaced apart in the radial direction of the stator core 411, and the distance between the avoidance slot 124 in the plurality of connecting sections 123 and one end surface S1 increases in sequence in the direction away from the central hole CH. As shown in Figure 15As shown, the distance between the clearance groove 124 in the connecting section 123 connected by the straight section 121a and the end surface S2 of the stator core 411 is smaller than the distance between the clearance groove 124 in the connecting section 123 connected by the straight section 121b and the end surface S2 of the stator core 411.

[0122] In an embodiment, the included angle between each clearance groove 124 and the end surface S1 along the radial direction of the stator core 411 away from the central hole CH is greater than 0 degrees and less than 90 degrees. Figure 15 As shown, the included angle θ between each clearance groove 124 of each connecting section 123 and the end surface S2 of the stator core 411 along the radial direction of the stator core 411 away from the central hole CH of the stator core 411 is greater than 0 degrees and less than 90 degrees.

[0123] In an embodiment, the included angle between each clearance groove 124 and the end surface S1 along the radial direction of the stator core 411 away from the central hole CH is greater than 0 degrees and less than 45 degrees.

[0124] That is, the length direction of each clearance groove 124 has an included angle θ relative to the thickness direction of the connecting section 122, thereby reducing the bending angle of each crossover section 122a relative to the straight section 121, so that the large bending of the crossover section 122a relative to the straight section 121 can be avoided, and the influence on the connection strength of the flat wire winding 410 in the flat wire motor 400 is reduced.

[0125] In the flat wire motor 400 provided by the embodiments of the present application, the winding slot G in the stator core 411 of the motor stator 410 adopts a narrow slot opening, and the connecting section 123 or the clearance groove 124 is arranged at the connection position between each crossover section 122a and the straight section 121 in each continuous wave winding flat wire 120 in the stator winding 412, thereby forming a narrow waist section, so that the narrow waist section of the continuous wave winding flat wire 120 avoids the narrow slot opening of the stator core 411, and the continuous wave winding flat wire 120 is axially assembled into the plurality of winding slots G of the stator core 411. In the flat wire motor 400 provided by the embodiments of the present application, not only the slot opening of the winding slot G does not need to be widened, but also the continuous wave winding flat wire 120 can be axially assembled, which not only improves the assembly efficiency of the motor stator 410, but also takes into account the NVH performance of the flat wire motor 400.

[0126] In the flat wire motor 400 provided by the embodiment of the present application, the straight section 121 and the plurality of 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 in which the cross sections 122a and 122b are formed by twisting or bending during the process of inserting the continuous wave winding flat wire 120 into the stator core 411, the height of the stator winding 412 exposed from both ends of the stator core 411 can be reduced by 5-10 mm, which not only can improve the assembly efficiency of the motor stator 410 and reduce the manufacturing cost of the stator winding, but also can reduce the axial size of the flat wire motor 400. In addition, the wear and deformation of the stator winding 412 during the assembly process can be reduced, thereby improving the rotation speed and peak power of the flat wire motor 400.

[0127] 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 conducive 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 provided by the embodiment of the present application adopts a narrow slot structure, thereby improving the NVH performance of the power assembly, which is conducive to improving the NVH performance of the power assembly 10. In addition, the structure design of the flat wire motor 400 can avoid the wear and deformation of the stator winding 412 during the process of inserting the stator winding 412 into the stator core 411, thereby improving the rotation speed and peak power of the flat wire motor 400, which is conducive to improving the power performance of the power assembly 10.

[0128] 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.

[0129] The above is only a specific embodiment 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 range disclosed by the present application, which should be covered within 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 in that, The stator of the flat wire motor includes a stator core and stator windings. The stator core includes a central hole and multiple winding slots. Each winding slot and the central hole penetrates both end faces of the stator core along its axial direction. The central hole accommodates the rotor of the flat wire motor. The slot opening of each winding slot faces the central hole. The stator windings include multiple continuously wound flat wires. Each continuously wound flat wire includes two leads, multiple straight segments, and multiple bridging segments. Each straight segment is arranged in one winding slot. The two ends of each bridging segment are used to connect two straight segments in different winding slots. Each lead is used to connect one straight segment. Wherein: Along the axial direction of the stator core, a portion of the bridging segment of each of the continuous wave-wound flat wires is exposed on one end face of the stator core, and the two ends of each of the bridging segments are respectively connected to two straight segments by two connecting segments; Along the circumference 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 line width of each connecting segment is a third width, and the line width of each straight segment or each bridging 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 portion of the bridging section and the two leads of each of the continuous wave-wound flat wires are exposed on another end face of the stator core, and the two ends of each of the bridging sections are directly connected to the two straight segments respectively.

3. The flat wire motor according to claim 2, characterized in that, One of the leads in each of the continuous wave wound flat wires is used to weld another lead in another of the continuous wave wound flat wires to form a welded end. The two leads welded together radially along the stator core are arranged adjacent to each other, wherein: Along the axial direction of the stator core, the distance between each welded end and the other end face is greater than the distance between each bridging segment and the other end face in the other bridging segment.

4. The flat wire motor according to any one of claims 1-3, characterized in that, In the same winding slot, multiple straight segments are arranged sequentially along the radial direction of the stator core, and one of the multiple straight segments and another straight segment are arranged sequentially in a direction away from the central hole, wherein: The distance between one of the connecting segments connected by a straight line segment and one of the end faces is less than the distance between the other connecting segment connected by the other straight line segment and one of the end faces.

5. The flat wire motor according to any one of claims 1-4, characterized in that, Each of the connecting segments includes two sides, each side including two clearance slots, the slot openings of the two clearance slots facing opposite directions, and the distance between the bottoms of the two clearance slots being less than the slot opening width of each winding slot.

6. The flat wire motor according to claim 5, characterized in that, Two straight segments are arranged sequentially in the same winding slot along the radial direction of the stator core away from the central hole. The distance between a clearance slot in a connecting segment connected by one of the two straight segments and the end face is smaller than the distance between another clearance slot in another connecting segment connected by the other straight segment and the end face.

7. The flat wire motor according to claim 5, characterized in that, Multiple straight segments along the radial direction of the stator core are arranged sequentially in the same winding slot, and the distance between multiple clearance slots and one end face in the multiple connecting segments connected by the multiple straight segments increases sequentially in the direction away from the one central hole.

8. The flat wire motor according to claim 5, characterized in that, The angle between each of the clearance slots and the end face, radially away from the center hole of the stator core, is greater than 0 degrees and less than 90 degrees.

9. The flat wire motor according to claim 5, characterized in that, The length of each of the clearance slots is greater than the thickness of each of the straight segments and the thickness of each of the cross-joint segments.

10. The flat wire motor according to claim 5, characterized in that, The openings of the two clearance slots in each of the connecting segments are oriented opposite to each other along the circumference of the stator core.

11. The flat wire motor according to claim 5, characterized in that, The bottom width of each of the aforementioned clearance slots is less than the opening width.

12. The flat wire motor according to claim 5, characterized in that, The bottom width of each of the clearance slots is less than the opening width of each of the winding slots.

13. The flat wire motor according to any one of claims 1-12, characterized in that, Each winding slot includes two slot walls arranged circumferentially opposite each other along the stator core. Each slot wall includes a first slot wall segment and a second slot wall segment. The first slot wall segment and the second slot wall segment are arranged sequentially along the radial direction of the stator core away from the central hole, wherein: In each of the winding slots, the first segment of the slot wall bends toward the other slot wall, and the distance between the two first segments of the slot wall in each winding slot is less than the distance between the two second segments of the slot wall.

14. A powertrain, characterized in that, The powertrain includes a reducer and a flat wire motor as described in any one of claims 1-13, wherein the motor shaft of the flat wire motor is used for drive connection to the input shaft of the reducer.

15. An electric vehicle, characterized in that, The electric vehicle includes wheels, a transmission mechanism, and a powertrain as described in claim 14, the powertrain being used to drive the wheels via the transmission mechanism.

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