Flat wire motor, power assembly and electric vehicle

Abstract

The invention provides a flat wire motor, a power assembly and an electric vehicle. A stator of the motor comprises a stator iron core and a stator winding, each winding groove and a center hole of the stator iron core penetrate through the two end faces of the stator iron core in the axial direction of the stator, the center hole is used for containing a rotor, and a groove opening of each winding groove faces the center hole. Each flat wire of the stator winding comprises two leading-out ends, a plurality of straight line sections and a plurality of bridging sections, each straight line section is arranged in one winding groove, two ends of each bridging section are respectively used for connecting two straight line sections in different winding grooves, and each leading-out end is connected with one straight line section. A part of the bridging section in each flat wire is exposed out of one end face in the axial direction of the stator, and the two ends of each bridging section in the part of the bridging section are connected with the two straight line sections through the two connecting sections respectively. Along the circumferential direction of the stator iron core, the line width of each connecting section is smaller than the notch width of each winding groove, and the notch width of each winding groove is smaller than the in-groove width and the line width of each straight line section or each bridging section.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicles, and in particular to a flat wire motor, a power assembly and an electric vehicle. Background Art

[0002] At present, the driving motors in the powertrain of electric vehicles are gradually replaced by flat wire motors from round wire motors. The flat wire windings of flat wire motors usually adopt Hair-Pin, X-Pin, I-Pin, W-pin or S-Winding, but it is difficult to take into account the requirements of NVH performance, assembly efficiency, manufacturing cost, axial size, etc., thus affecting the performance of flat wire motors, powertrains and electric vehicles. Summary of the invention

[0003] The present application provides a flat wire motor, a powertrain and an electric vehicle, which can take into account the requirements of NVH performance, assembly efficiency, manufacturing cost, axial size, etc., thereby improving the performance of the flat wire motor, the powertrain and the electric vehicle, and reducing the manufacturing cost of the flat wire motor, the powertrain and the electric vehicle.

[0004] The embodiment of the present application provides a flat wire motor. In the embodiment of the present application, 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 drive and connect the motor shaft. When the motor controller controls the operation of the flat wire motor, the motor rotor in the flat wire motor rotates relative to the motor stator, and the motor rotor drives the motor shaft to rotate.

[0005] In an embodiment of 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 an embodiment of the present application, the stator core includes two end faces, and the two end faces are arranged opposite to each other along the axial direction of the stator core. The stator core includes a center hole and a plurality of winding slots. Each winding slot and a center hole penetrate the two end faces of the stator core along the axial direction of the stator core. The center hole is used to accommodate the motor rotor of the flat wire motor. The notch of each winding slot faces the center hole. The notch width of each winding slot is smaller than the slot width of each winding slot.

[0006] In an embodiment of the present application, the stator winding includes a plurality of continuous wave wound flat wires. Each continuous wave wound flat wire includes two lead-out ends, a plurality of straight segments and a plurality of crossover segments. Each straight segment is arranged in a winding slot. The two ends of each crossover segment are respectively used to connect two straight segments in different winding slots, and each lead-out end is used to connect a straight segment. The line width of each straight segment in each continuous wave wound flat wire is greater than the slot width of each winding slot and less than the slot width of each winding slot.

[0007] In the embodiment of the present application, the line width of each jumper section in each continuous wave flat wire is larger than the slot width of each winding slot and smaller than the slot width of each winding slot.

[0008] In one embodiment, multiple straight segments of the same continuous wave wound flat wire are arranged in different winding slots. In one embodiment, both ends of each crossover segment in the same continuous wave wound flat wire are used to connect two straight segments in different winding slots. In one embodiment, one end of each straight segment in the same continuous wave wound flat wire is used for a crossover segment or a lead-out terminal, and the other end of each straight segment is used for another crossover segment or another lead-out terminal.

[0009] In an embodiment of the present application, one lead end of a connecting wave-wound flat wire is used to weld another lead end of another connecting wave-wound flat wire to form a welded end. In one embodiment, the two lead ends of the same connecting wave-wound flat wire are respectively used to weld the two lead ends of the other two connecting wave-wound flat wires. In one embodiment, the two lead ends of the same connecting wave-wound flat wire are respectively used to weld the two lead ends of the other connecting wave-wound flat wire. In one embodiment, the two welded lead ends are arranged adjacent to each other along the radial direction of the stator core.

[0010] In the embodiment of the present application, a plurality of bridging segments of each continuous wave-wound flat wire are arranged on both sides of the stator core along the axial direction of the stator core. In one embodiment, a portion of the bridging segments of each continuous wave-wound flat wire is exposed on one end face of the stator core along the axial direction of the stator core, and two ends of each bridging segment of a portion of the bridging segments exposed on one end face of the stator core are connected to two straight line segments through two connecting segments respectively. Along the circumference of the stator core, the line width of each connecting segment is smaller than the slot width of each winding slot.

[0011] In one embodiment, along the circumference of the stator core, the slot width of each winding slot is the first width, the slot width of each winding slot is the second width, and the line width of each connecting segment is the third width. The line width of each straight line segment or each bridge segment is the fourth width. The first width is smaller than the second width, the third width is smaller than the first width, and the first width is smaller than the fourth width.

[0012] In one embodiment, a plurality of straight segments in the same winding slot are sequentially arranged along the radial direction of the stator core, and one straight segment and another straight segment of the plurality of straight segments are sequentially arranged along a direction away from the center hole. The spacing between a connecting segment connected by one straight segment and an end face is smaller than the spacing between another connecting segment connected by another straight segment and an end face.

[0013] In one embodiment, each connecting section includes two side surfaces, wherein the two side surfaces respectively include two avoidance grooves, the notches of the two avoidance grooves face opposite directions, and the spacing between the bottoms of the two avoidance grooves is smaller than the notch width of each winding groove.

[0014] By processing an avoidance groove on each of the two side surfaces of the connecting section arranged opposite to each other along the circumferential direction of the stator core, the line width of the connecting section can be set narrower than the bridge section and the straight section along the circumferential direction of the stator core, thereby simplifying the processing technology of the continuous wave winding flat wire.

[0015] In one embodiment, the openings of the two avoidance grooves in each connecting segment face away from each other along the circumferential direction of the stator core.

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

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

[0018] In one embodiment, an angle between each avoidance groove and an end surface in the radial direction of the stator core away from the central hole is greater than 0 degrees and less than 90 degrees.

[0019] In this way, the bending angle of each jumper segment relative to the straight segment can be reduced, thereby avoiding a large bending of the jumper segment relative to the straight segment and reducing the influence on the connection strength of the flat wire winding in the flat wire motor.

[0020] In one embodiment, the length of each avoidance groove is greater than the thickness of each straight segment and the thickness of each bridging segment.

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

[0022] In one embodiment, a plurality of straight line segments along the radial direction of the stator core are sequentially arranged in the same winding slot, and the spacing between a plurality of avoidance grooves and an end surface in a plurality of connecting segments connected by the plurality of straight line segments increases sequentially in a direction away from the center hole.

[0023] In one embodiment, along the axial direction of the stator core, another part of the bridging section and two lead-out ends of each continuous wave wound flat wire are exposed at another end surface of the stator core, and both ends of each bridging section in the other part of the bridging section are directly connected to two straight line sections respectively.

[0024] In one embodiment, one lead end of each continuous wave wound flat wire is used to weld another lead end of another continuous wave wound flat wire to form a welding end, and the two lead ends welded together along the radial direction of the stator core are arranged adjacent to each other, and the distance between each welding end and the other end face along the axial direction of the stator core is greater than the distance between each bridge section in another part of the bridge section and the other 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 slot wall section and a second slot wall section, and the first slot wall section and the second slot wall section of each slot wall are arranged in sequence along the radial direction of the stator core away from the central hole. The first slot wall section of each slot wall in each winding slot is bent toward the other slot wall, and the spacing between the two first slot walls in each winding slot is smaller than the spacing between the two second slot walls.

[0026] In the flat wire motor provided in the embodiment of the present application, the winding slots in the stator core of the motor stator adopt narrow slots, and a connecting section or an avoidance slot is set at the connection between each bridging section and the straight section in each continuous wave wound flat wire in the stator winding to form a narrow waist section, so as to use the narrow waist section of the continuous wave wound flat wire to avoid the narrow slot of the stator core, so as to realize the continuous wave wound flat wire being loaded into the multiple winding slots of the stator core along the axial direction of the stator core. In the flat wire motor provided in the embodiment of the present application, not only is it unnecessary to widen the slot of the winding slot, but also it is possible to realize the assembly of the continuous wave wound flat wire 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, a straight segment and a plurality of crossover segments are formed before the continuous wave wound flat wire is inserted into the stator core. Compared with the manufacturing process in the prior art in which the crossover segment needs to be formed by twisting or bending the continuous wave wound flat wire during the insertion of the stator core, the height of the stator winding exposed at both ends of the stator core can be reduced by 5 to 10 mm. Accordingly, not only can the assembly efficiency of the motor stator be improved and the manufacturing cost of the stator winding be reduced, but also the axial size of the flat wire motor can be reduced. Furthermore, not only can the assembly efficiency of the stator winding be improved, but also the manufacturing cost of the stator winding be reduced. The structural design of the flat wire motor 400 can avoid the wear and deformation of the stator winding 412 during the insertion of 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 beneficial to improving the power performance of the powertrain 10.

[0028] The embodiment of the present application provides a power assembly. The power assembly provided by the embodiment of the present application includes a reducer and a flat wire motor provided by the embodiment of the present application. The motor shaft of the flat wire motor is used for transmission connection to 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 includes wheels, a transmission mechanism, and a powertrain provided by the embodiment of the present application. The powertrain is used to drive the wheels through the transmission mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of an electric vehicle provided in an embodiment of the present application.

[0031] Figure 2 Another schematic diagram of an electric vehicle provided in an embodiment of the present application.

[0032] Figure 3 A schematic diagram of a flat wire motor provided in an embodiment of the present application.

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

[0034] Figure 5 for Figure 4 A schematic diagram of part A of the stator core is shown.

[0035] Figure 6 It is a schematic diagram of a continuous wave wound flat wire in the stator winding of a flat wire motor in an embodiment of the present application.

[0036] Figure 7 It is a schematic diagram of a manufacturing process of a continuous wave wound flat wire in a stator winding of a flat wire motor in an embodiment of the present application.

[0037] Figure 8 Another schematic diagram of the manufacturing process of the continuous wave wound flat wire in the stator winding of the flat wire motor in the embodiment of the present application.

[0038] Fig. 9 Another schematic diagram of the manufacturing process of the continuous wave wound flat wire in the stator winding of the flat wire motor in the embodiment of the present application.

[0039] Fig.10 A schematic diagram of a flat wire group in the flat wire motor manufacturing process provided in an embodiment of the present application.

[0040] Fig.11 A schematic diagram of a manufacturing process of a motor stator in a flat wire motor provided in an embodiment of the present application.

[0041] Fig.12 Another schematic diagram of the manufacturing process of the motor stator in the flat wire motor provided in the embodiment of the present application.

[0042] Fig.13 Another schematic diagram of the manufacturing process of the motor stator in the flat wire motor provided in the embodiment of the present application.

[0043] Fig.14 A schematic diagram of a motor stator of a flat wire motor provided in an embodiment of the present application.

[0044] Fig.15 Another schematic diagram of the motor stator of the flat wire motor provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0046] The "equal" in this application is not equal to the strict sense, but is within the tolerance range. The "parallel" is not parallel to the strict sense, but is within the tolerance range. The "perpendicular" is not perpendicular to the strict sense, but is within the tolerance range.

[0047] In the embodiments of the present application, the same reference numerals represent the same component or the same part. In the embodiments of the present application, for multiple identical parts, only one of the parts may be marked with a reference numeral in the drawings as an example. For other identical parts or components, the reference numerals are also applicable. 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 provided in an embodiment of the present application. Figure 1 As shown, the electric vehicle 1 includes one or more powertrains 10, power batteries 20 and wheels 30. In one embodiment, the powertrain 10 is used to receive power from the power battery 20 and to convert electrical energy into mechanical energy and drive the wheels 30 to rotate.

[0049] The electric vehicles provided in the embodiments of the present application include pure electric vehicles, hybrid electric vehicles, extended-range electric vehicles, plug-in hybrid electric vehicles or new energy vehicles, etc. Among them, pure electric vehicles are also called pure electric vehicle / battery electric vehicle, or simply pure EV / battery EV. Hybrid electric vehicles are also called hybrid electric vehicles, or simply HEV. Extended-range electric vehicles are also called range extended electric vehicles, or simply REEV. Plug-in hybrid electric vehicles are also called plug-in hybrid electric vehicles, or simply PHEV. New energy vehicles are also called new energy vehicles, or simply NEV.

[0050] Figure 2 Another schematic diagram of an electric vehicle provided in an embodiment of the present application. Figure 2As shown, in addition to the powertrain 10, power battery 20 and wheel 30 described above, the electric vehicle also includes a power module 40. The power module 40 is used to receive 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 pile or a DC charging pile. The power module 40 includes at least one of a DC charger or an AC charger.

[0051] In one embodiment, the power assembly 10 includes a motor controller 300 and a flat wire motor 400. In one embodiment, the power assembly 10 includes a motor controller 300, a flat wire motor 400 and a reducer 500. In one embodiment, the power assembly 10 includes a flat wire motor 400 and a reducer 500.

[0052] like Figure 2 As shown, the motor controller 300 is used to receive the DC power output by the power battery 20 , and convert the DC power output by the power battery 20 into AC power to control the flat wire motor 400 to drive the wheel 30 of the electric vehicle through the reducer 500 .

[0053] Figure 3 A schematic diagram of a flat wire motor provided in an embodiment of the present 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 is used to accommodate the motor rotor 420, and the motor rotor 420 is used to drive and connect the motor shaft 430. During the process of the motor controller 300 controlling the operation of the flat wire motor 400, the motor rotor 420 in the flat wire motor 400 rotates relative to the motor stator 410, and the motor rotor 420 drives the motor shaft 430 to rotate.

[0054] In the embodiment of the present application, the motor 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 the alternating current provided by the motor controller 300.

[0055] Figure 4 A schematic diagram of a stator core in a motor stator of a flat wire motor provided in an embodiment of the present application. Figure 4 As shown, the stator core 411 includes two end surfaces S1 and S2 , wherein the two end surfaces S1 and S2 are opposite to each other along the axial direction of the stator core 411 .

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

[0057] In the embodiment of the present application, 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 the embodiment of the present application, 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 the embodiment of the present application, the heights of the two ends of the stator core 411 can be understood as the heights of the multiple bridging sections 122 along the axial direction of the stator core 411 .

[0060] like Figure 4 As shown, the stator core 411 includes a center hole CH. The center hole CH is used to accommodate the motor rotor 420. Along the axial direction of the stator core 411, the center hole CH of the stator core 411 penetrates the two end surfaces 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, and the inner circumferential surface S3 and the outer circumferential surface S4 are arranged opposite to each other in the radial direction of the stator core 411. The inner circumferential surface S3 of the stator core 411 is the hole wall of the center hole CH.

[0062] like Figure 4 As shown, the stator core 411 includes a plurality of winding slots G. Each winding slot G penetrates through 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. In the radial direction of the stator core 411, each winding slot G faces the center hole CH of the stator core 411.

[0063] In the embodiment 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 faces the center 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.

[0064] Figure 5 for Figure 4 A schematic diagram of part A of the stator core is shown in FIG. Figure 5 As shown, along the circumference of the stator core 411, the slot width of each winding slot G is smaller than the slot width of each winding slot G. In the embodiment of the present application, the slot width of each winding slot G is smaller than the slot width of each winding slot G, so that each winding slot G in the stator core 411 forms a narrow slot, thereby improving the NVH performance of the motor.

[0065] The slot width of each winding slot G is the circumferential width of the portion of each winding slot G used to connect to the center hole CH, and the slot width of each winding slot G is the circumferential width of the portion of each winding slot G used to accommodate the flat wire winding. For ease of explanation, the slot width of each winding slot G is the first width W1, and the slot width of each winding slot G is the second width W2, and the slot width W2 of each winding slot G is greater than the slot width W1 of each winding slot G. Figure 5 As shown, W2 is greater than W1.

[0066] like Figure 5 As shown, each winding slot G includes two slot walls H that are arranged opposite to each other along the circumferential direction of the stator core 411. In one embodiment, each slot wall H includes a first slot wall H1 and a second slot wall H2.

[0067] In one embodiment, the first slot wall H1 and the second slot wall H2 of each slot wall H are arranged in sequence along the radial direction of the stator core 411 away from the central hole CH of the stator core 411. Figure 5 As shown, the first slot wall H1 is closer to the slot opening of the winding slot G than the second slot wall H2. Figure 5 As shown, the space between the two first-section slot walls H1 is connected to the center hole CH, so that each winding slot G in the stator core 411 forms a narrow slot, thereby improving the NVH performance of the motor.

[0068] like Figure 5 As shown, the first section slot wall H1 in each slot wall H in each winding slot G is bent toward the other slot wall H, and the spacing between the two first sections slot walls H1 in each winding slot G is smaller than the spacing between the two second sections slot walls H2, so that each winding slot G in the stator core 411 forms a narrow slot, thereby improving the NVH performance of the motor.

[0069] like Figure 5 As shown, the minimum spacing between the two first-segment slot walls H1 is smaller than the minimum spacing between the two second-segment slot walls H2, and the slot width of each winding slot G is smaller than the slot width. Accordingly, each winding slot G includes a narrow slot. In the embodiment of the present application, the stator core 411 of the motor stator 410 in the flat wire motor 400 adopts a winding slot G with a narrow slot, thereby improving the NVH performance of the motor.

[0070] Figure 6 Schematic diagram of a continuous wave wound flat wire in the stator winding of the flat wire motor in the embodiment of the present application. In the embodiment of the present application, the stator winding 412 includes a plurality of continuous wave wound flat wires 120. Figure 6 As shown, each continuous wave wound flat wire 120 includes a plurality of straight segments 121 , a plurality of jumper segments 122 a and 122 b , and two lead ends 126 .

[0071] Each straight line segment 121 is arranged in a winding slot G. Two ends of each bridging segment 122 a or 122 b are respectively used to connect two straight line segments 121 in different winding slots G, and each lead-out end 126 is used to connect a straight line segment 121 .

[0072] In the embodiment of the present application, one lead end 126 of a connecting wave-wound flat wire 120 is used to weld another lead end 126 of another connecting wave-wound flat wire 120 to form a welded end. In one embodiment, the two lead ends 126 of the same connecting wave-wound flat wire 120 are respectively used to weld two lead ends 126 of two other connecting wave-wound flat wires 120. In one embodiment, the two lead ends 120 of the same connecting wave-wound flat wire 120 are respectively used to weld two lead ends 126 of another connecting wave-wound flat wire 120. 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 segments 121 in each continuous wave wound flat wire 120 are respectively arranged in a plurality of winding slots G. In one embodiment, the plurality of jumper segments 122a are exposed at one end surface of the stator core 411. In one embodiment, the plurality of jumper segments 122b and the two lead-out terminals 126 are exposed at the other end surface of the stator core 411.

[0074] Figure 7 It is a schematic diagram of a manufacturing process of a continuous wave wound flat wire in a stator winding of a flat wire motor in an embodiment of the present application. Figure 8 Another schematic diagram of the manufacturing process of the continuous wave wound flat wire in the stator winding of the flat wire motor in the embodiment of the present application.

[0075] like Figure 7 As shown, each flat wire 120 is bent according to the preset positioning points to form a plurality of straight segments 121, a plurality of bridging segments 122a and 122b, and two lead-out ends 126, thereby forming a continuous wave-wound flat wire 120. Figure 7 As shown, each flat wire 120 includes three groups of positioning points. Among them, the first group of positioning points A11-A16 are used as the bending points between the multiple bridging segments 122a of a group of bridging segments 122a of the continuous wave winding flat wire 120 and the straight line segment 121, the second group of positioning points B11-B14 are used as the bending points between a bridging segment 122b of another group of bridging segments 122b of the continuous wave winding flat wire 120 and the straight line segment 121, and the third group of positioning points C11-C12 are used as the bending points between the lead-out end 126 of the continuous wave winding flat wire 120 and the straight line segment 121. According to each group of positioning points, each flat wire 120 is bent to obtain a continuous wave winding flat wire 120.

[0076] In one embodiment, the lengths of the plurality of straight segments 121 are equal. The length of the straight segment 121 can be understood as the size of the straight segment 121 along the extension direction of the straight segment 121. In this way, the production process of each continuous wave wound flat wire 120 can be simplified.

[0077] like Figure 6 and Figure 7 As shown, each continuous wave wound flat wire 120 includes a plurality of bridging segments 122, and the two ends of each bridging segment 122 are respectively used to connect two straight segments 121. In the circumferential direction of the stator core 411, the line width of each bridging segment 122 is greater than the slot width of each winding slot G and less than the slot width of each winding slot G.

[0078] Combination Figure 5 and Figure 8 As shown, the slot 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 line width of each bridging 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] like Figure 6 and Figure 7 As shown, the multiple bridging segments 122 of each continuous wave wound flat wire 120 are divided into multiple bridging segments 122a and multiple bridging segments 122b. The two ends of the same straight line segment 121 are respectively used to connect a bridging segment 122a and a bridging segment 122b. In the embodiment of the present application, the multiple bridging segments 122a can also be referred to as a part of the bridging segments in the continuous wave wound flat wire 120, and the multiple bridging segments 122b can also be referred to as another part of the bridging segments in the continuous wave wound flat wire 120.

[0080] like Figure 6 As shown, each continuous wave wound flat wire 120 further includes a plurality of connecting segments 123. In one embodiment, before each flat wire 120 is bent, a flattening die is used to process the fourth group of positioning points L1 to L6 in each flat wire 120, so as to obtain Figure 6 The plurality of connecting segments 123 shown are shown. Using a flattening die for processing before bending can simplify the processing difficulty compared to using a flattening die for processing after bending.

[0081] like Figure 6 or Figure 7As shown, a plurality of crossover segments 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 number of layers where the two straight line segments 121 connected at both ends of each crossover segment 122a of each continuous wave winding flat wire 120 are located differs by 1. For example, a straight line segment 121 connected by each crossover segment 122a of each continuous wave winding flat wire 120 is arranged in the kth layer of a winding slot G, and another straight line segment 121 connected by each crossover segment 122a of each continuous wave winding flat wire 120 is arranged in the (k+1)th layer of another winding slot G, wherein k is a positive odd number.

[0082] In one embodiment, the spans of the multiple jumper segments 122 of the same continuous wave flat wire 120 include various types. In the embodiment of the present application, the span of each jumper segment 122 refers to the distance between the winding slots G where the two straight segments 121 connected at both ends of each jumper segment 122 are located.

[0083] In one embodiment, the length of each jumper segment 122a or 122b is equal. In other words, the length of each jumper segment 122a is equal, and the length of each jumper segment 122b is equal. In this way, the production process of each continuous wave wound flat wire 120 can be simplified. In one embodiment, the number of jumper segments 122a is greater than the number of jumper segments 122b. In one embodiment, the line width of each jumper segment 122 along the circumference of the stator core 411 is equal to the line width of each straight line segment 121, thereby simplifying the production process of each continuous wave wound flat wire 120.

[0084] In one embodiment, two ends of a bridging segment 122a are connected to two straight segments 123 through two connecting segments 123. In one embodiment, two ends of a bridging segment 122b are directly connected to two straight segments 123. Figure 7 As shown, one end of a straight segment 121 is connected to one end of a bridging segment 122a through a connecting segment 123, and the other end of a bridging segment 122a is connected to another straight segment 121 through another connecting segment 123. The other end of a straight segment 121 is directly connected to one end of a bridging segment 122b, and the other end of a bridging segment 122b is directly connected to another straight segment 121.

[0085] Combination Figure 4 and Figure 6As shown, a portion of the cross-over section 122a of each continuous wave winding flat wire is exposed on the end surface S1 of the stator core 411 along the axial direction of the stator core, and two ends of each cross-over section 122a of the portion of the cross-over section 122a exposed on the end surface S1 of the stator core 411 are connected to two straight line sections 121 through two connecting sections 123. Along the circumferential direction of the stator core 411, the line width of each connecting section 123 is smaller than the slot width of each winding slot G, and the line width of each connecting section 123 is smaller than the line width of each straight line section 121, each cross-winding section 122a or 122b, and the line width of each straight line section 121, each cross-winding section 122a or 122b is larger than the slot width of each winding slot G and smaller than the slot 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 width of each winding slot G is the first width W1, the slot width of each winding slot G is the second width W2, the line width of each connecting segment 123 is the third width W3, and the line width of each straight segment 121 or each bridging segment 122 is the fourth width W4. Among them, the first width W1 is smaller than the second width W2, the third width W3 is smaller than the first width W1, the first width W1 is smaller than the fourth width W4, and the fourth width W4 is smaller than the second width W2.

[0087] In one embodiment, before each flat wire 120 is bent, both ends D1-D2 of each flat wire 120 are stripped and chamfered, so as to facilitate welding of the two lead ends 126. In addition, stripping and chamfering before bending simplifies the processing difficulty compared to stripping and chamfering after bending.

[0088] like Figure 7 As shown, the two lead-out ends 126 of each continuous wave wound flat wire 120 are distributed at both ends of each continuous wave wound flat wire 120. Figure 5 , Figure 6 and Figure 7 As shown, two lead-out ends 126 and a plurality of cross-over segments 122b in each continuous wave wound flat wire 120 are exposed on the same end surface S2 of the stator core 411. Each lead-out end 126 in each continuous wave wound flat wire 120 is connected to a cross-over segment 122a via a straight line segment 121. Thus, the two lead-out ends 126 and a group of cross-over segments 122a of each continuous wave wound flat wire 120 are distributed on different sides of the plurality of straight line segments 121 of each continuous wave wound flat wire 120, and the two lead-out ends 126 and another group of cross-over segments 122b of each continuous wave wound flat wire 120 are distributed on the same side of the plurality of straight line segments 121 of each continuous wave wound flat wire 120.

[0089] The two lead-out ends 126 and the multiple cross-over sections 122a of each continuous wave wound flat wire 120 are distributed on both sides of the multiple straight segments 121 along the axial direction of the stator core 411, thereby avoiding interference caused by the lead-out ends 126 during the insertion of the continuous wave wound 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 multiple cross-over sections 122a of each continuous wave wound flat wire 120 are distributed on both sides of the multiple straight segments 121 along the axial direction of the stator core 411, and the height of the end surface S1 of the stator winding 412 exposed from the stator core 411 can also be reduced, thereby reducing the axial size of the flat wire motor 400.

[0090] In addition, along the axial direction of the stator core 411, the lead-out ends 126 of all the continuous wave wound flat wires 120 are located on the same side of the stator core 411, so that the electrical connection between all the continuous wave wound flat wires 120 is convenient, and the complexity of the electrical connection between all the continuous wave wound flat wires 120 is reduced. In addition, the busbars of the stator can be centrally arranged on the same side of the stator core 411, which can reduce the space occupancy of the stator.

[0091] In one embodiment, the two lead ends 126 of each continuous wave wound flat wire 120 have the same length. The length of the lead end 126 can be understood as the size of the lead end 126 along the extension direction of the lead end 126. In this way, the production process of each continuous wave wound flat wire 120 can be simplified.

[0092] In one embodiment, the number of layers where the straight line segment 121 connected to one of the two lead-out ends 126 of each continuous wave flat wire 120 is located differs from the number of layers where the straight line segment 121 connected to the other lead-out end 126 is located is 1. For example, the layer where the straight line segment 121 connected to one lead-out end 126 is located is the jth layer, and the layer where the straight line segment 121 connected to the other lead-out end 126 is located is the (j+1)th layer. Wherein, j is a positive odd number.

[0093] In some embodiments, the two lead-out ends 126 of each continuous wave wound flat wire 120 are arranged at intervals along the radial direction of the stator core. There is an interval between the two lead-out ends 126 of each continuous wave wound flat wire 120 along the circumferential direction of the stator core 411. In this way, the two lead-out ends 126 of each continuous wave wound flat wire 120 will not interfere with each other, and the structure of the stator core 411 can be made more compact.

[0094] In one embodiment, each connecting section 123 includes two avoidance grooves 124. Along the circumference of the stator core 411, the slot openings of the two avoidance grooves 124 face opposite directions. In one embodiment, along the circumference of the stator core 411, the slot bottom spacing between the two avoidance grooves 124 in each connecting section 123 is smaller than the slot opening width of each winding slot G. In one embodiment, the slot bottom width of each avoidance groove 124 is smaller than the slot opening width of each winding slot.

[0095] In one embodiment, the line width of the connecting section 123 refers to the line width of two avoidance grooves 124 in the connecting section 123. In one embodiment, the line width of the connecting section 123 refers to the spacing between the bottoms of two avoidance grooves 124 along the circumference of the stator core 411.

[0096] In one embodiment, the length of each avoidance groove 124 in each connecting segment 123 is greater than the thickness of each straight segment 121 and each bridging segment 122a in each connecting wave-wound flat wire 120. Figure 8 As shown, the length of each avoidance groove 124 is a first length L1, and the thickness of each bridging section 122a is a second length L2. The first length L1 is greater than the second length L2. Figure 8 As shown, the thickness of each straight line segment 121 is a third length L3, wherein the first length L1 is greater than the third length L3.

[0097] In the embodiment of the present application, the thickness direction of each straight segment 121 refers to the direction in which multiple straight segments 121 are arranged in sequence in the same winding slot G. The thickness direction of each straight segment 121 and each bridge segment 122a is perpendicular to the length direction and width direction of each straight segment 121 and each bridge segment 122a.

[0098] Fig. 9 FIG. 2 is another schematic diagram of the manufacturing process of the continuous wave wound flat wire in the stator winding of the flat wire motor in the embodiment of the present application. Fig. 9 As shown, each connecting section 123 includes two side surfaces R1 and R2. The two side surfaces R1 and R2 respectively include two avoidance grooves 124. The notches of the two avoidance grooves 124 face in opposite directions.

[0099] By processing an avoidance groove 124 on each of the two side surfaces R1~R2 of the connecting section 123 that are arranged opposite to each other along the circumferential direction of the stator core 411, it is possible to set the line width of the connecting section 123 along the circumferential direction of the stator core 411 to be narrower than the bridge section 122 and the straight section 121, thereby simplifying the processing technology of the continuous wave winding flat wire 120.

[0100] like Fig. 9 As shown, along the circumference of the stator core 411, the slot bottom spacing between the two avoidance slots 124 in each connecting 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.

[0101] like Fig. 9As shown, the slot openings of the two avoidance slots 124 in each connecting section 123 face away from each other along the circumferential direction of the stator core 411. The line width of each bridging section 122a is the fourth width W4, the slot opening width of each avoidance slot 124 is the fifth width W5, and the slot bottom width of each avoidance slot 124 is the sixth width W6. The fifth width W5 is greater than the sixth width W6. The fifth width W5 and the sixth width W6 are both less than the fourth width

[0102] During the process of installing the stator winding into the stator core 411, when the avoidance groove 124 of the connecting section 123 is aligned with the notch of the winding slot G, the notch of the avoidance groove 124 avoids the notch 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 deformation or wear during the assembly process.

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

[0104] like Figure 8 and Fig. 9 As shown, the bending angle of each bridging segment 122a relative to a connected straight segment 121 is a, wherein the angle value of a is 50 degrees to 80 degrees.

[0105] In the embodiment of the present application, after each jumper segment 122a is bent relative to the two straight segments 121 connected to it, each continuous wave winding flat wire 120 can be inserted from the other end surface S2 of the stator core 411 along the axial direction of the stator core 411. The connecting segment 123 between each jumper segment 122a and the straight segment 121 is used to avoid the slot of each winding slot G, thereby facilitating the insertion of multiple straight segments 121 in each continuous wave winding flat wire 120 into multiple winding slots G of the stator core 411 along the axial direction of the stator core 411.

[0106] In the embodiment of the present application, after the multiple straight segments 121 in each continuous wave wound flat wire 120 are inserted into the multiple winding slots G of the stator core 411, the multiple jumper segments 122a in each continuous wave wound flat wire 120 are exposed at an end surface S1 of the stator core 411, and then the bending angle of each jumper segment 122a is corrected along the radial direction of the stator core 411 by a tool, so that the bending angle of each jumper 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 jumper segment 122a relative to the two straight segments 121 connected to it is 60 degrees. Not only can the connecting segment 123 between each jumper segment 122a and the straight segment 121 be used to avoid the notch of each winding slot G, but the bending angle of each jumper segment 122a relative to the straight segment 121 can also be reduced, reducing the impact on the connection strength of the continuous wave winding flat wire 120 and reducing the processing difficulty.

[0108] In one embodiment, a plurality of continuous wave wound flat wires 120 are assembled to form a flat wire group. Fig.10 A schematic diagram of a flat wire group in the flat wire motor manufacturing process provided in the embodiment of the present application. Fig.10 As shown, a plurality of straight line segments 121 of a plurality of connecting wave winding flat wires 120 are arranged at intervals to form a ring. Fig.10 In the ring shown, a plurality of straight line segments 121 of the same connecting wave winding flat wire 120 are arranged along the circumferential direction of the ring, and two straight line segments 121 of two different connecting wave winding flat wires 120 are arranged along the radial direction of the ring.

[0109] like Fig.10 As shown, a plurality of cross-over sections 122a in a plurality of continuous wave-wound flat wires 120 are arranged at the same end, and a plurality of cross-over sections 122b and a plurality of lead-out ends 126 in a plurality of connecting wave-wound flat wires 120 are arranged at the other end. Each cross-over section 122a in a plurality of connecting wave-wound flat wires 120 is bent toward the annular axis O1 to form an umbrella shape. A plurality of connecting sections 123 in each continuous wave-wound flat wire 120 are arranged around the axis of the umbrella shape.

[0110] In one embodiment, the flat wire group is inserted into the stator core 411 from the end surface S2 of the stator core 411 along the axial direction of the stator core 411 . Fig.11 Another schematic diagram of the manufacturing process of the motor stator in the flat wire motor provided in the embodiment of the present application. Fig.11 As shown, the multiple connecting segments 123 in the flat wire group are respectively aligned with the slots of the multiple winding slots G of the stator core 411 , so that the 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 surface S2 of the stator core 411 .

[0111] Fig.12 and Fig.13 Another schematic diagram of the manufacturing process of the motor stator in the flat wire motor provided in the embodiment of the present application. Fig.12As shown, during the axial movement of each flat wire group along the stator core 411, each connecting section 123 is used to avoid a winding slot G of the stator core 411, so that multiple winding slots G can accommodate multiple straight segments 121, and the center hole CH can accommodate multiple cross-over sections 122a. Accordingly, by avoiding the notch of the winding slot G by the connecting section 123, not only can the NVH performance be taken into account, but also the wear and deformation of the stator winding 412 caused during the insertion of the stator winding 412 into the stator core 411 can be avoided, thereby improving the speed and peak power of the flat wire motor 400. In addition, the multiple cross-over sections 122a in each continuous wave wound flat wire 120 can be wound before being inserted into the stator core 411, which can reduce the length of the cross-over section 122a exposed from the stator core 411, thereby taking into account the miniaturization of the flat wire motor.

[0112] like Fig.13 As shown, the flat wire group is pulled from one side of the end surface S1 of the stator core 411, so that multiple straight segments 121 in the flat wire group are respectively inserted into multiple winding slots G of the stator core 411. After each first connecting segment 123 is exposed at the end surface S1 of the stator core, the bending angle of each jumper segment 122a is corrected.

[0113] Fig.14 A schematic diagram of a motor stator of a flat wire motor provided in an embodiment of the present application. Fig.13 and Fig.14 As shown, in the process of correcting the bent multiple bridging segments 122a, the bending angle of each bridging segment 122a in the bent multiple bridging segments 122a is corrected to 0 degree.

[0114] In one embodiment, a plurality of flat wire groups are sequentially inserted into the stator core 411. After each flat wire group is inserted into the stator core 411, the bending angles of the plurality of bridging segments 122a in the inserted flat wire group are corrected before inserting another flat wire group.

[0115] In one embodiment, during the process of correcting the bending angles of the plurality of crossover segments 122a in the inserted flat wire group, the flat wire group is slightly squeezed in the radial direction of the stator core 411 toward the center hole CH, so that the circumferential gaps of the plurality of flat wire groups along the stator core 411 are smaller. After correcting each bent crossover segment 122a, the plurality of flat wire groups are slightly pushed in the radial direction away from the center hole CH of the stator core 411, so that the circumferential gaps of the plurality of flat wire groups along the stator core 411 are restored to their original state, so as to correct the flat continuous wave wound flat wire 120 and improve the space factor of the stator winding.

[0116] like Fig.14As shown, a group of jumper segments 122a of each continuous wave flat wire 120 of the stator winding is exposed at the end surface S1 of the stator core 411 along the axial direction of the stator core 411, and another group of jumper segments 122b and two lead ends 126 are exposed at the end surface S2 of the stator core 411 along the axial direction of the stator core 411, and the two ends of each jumper segment 122 are respectively used to connect two straight segments 121 in different winding slots G.

[0117] In one embodiment, a plurality of straight segments 121 in the same winding slot G are sequentially arranged along the radial direction of the stator core 411, and one straight segment 121 and another straight segment 121 in the plurality of straight segments 121 are sequentially arranged along a direction away from the center hole CH. The spacing between a connecting segment 123 connected to a straight segment 121 and an end surface S1 is smaller than the spacing between another connecting segment 123 connected to another straight segment 121 and an end surface S1.

[0118] Fig.15 Another schematic diagram of the motor stator of the flat wire motor provided in the embodiment of the present application. Fig.15 As shown, among the multiple straight segments 121 arranged in the same winding slot G, the distance between the connecting segment 123 connected to one end of the straight segment 121 close to the center hole CH of the stator core 411 and the end surface S2 of the stator core 411 is smaller than the distance between the connecting segment 123 connected to one end of the straight segment 121 away from the center 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 segment 123 is less than the length of each bridging segment 122 and the length of each straight segment 121. In some embodiments, the length of each connecting segment 123 is less than 1 / 5 of the length of each bridging segment 122 and 1 / 6 of the length of each straight segment 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 along the axial direction of the stator core 411, the strength of each continuous wave wound flat wire 120 can also be ensured.

[0120] For ease of description, 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. Fig.15 As shown, the straight line segment 121a and the straight line segment 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 smaller 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.

[0121] In one embodiment, a plurality of connecting segments 123 are sequentially arranged in a radial direction of the stator core 411, and the distance between the avoidance groove 124 and one end surface S1 in the plurality of connecting segments 123 increases sequentially in a direction away from the center hole CH. Fig.15As shown, the distance between the avoidance 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 avoidance 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 one embodiment, the angle between each avoidance groove 124 and an 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. Fig.15 As shown, an angle θ between each avoidance groove 124 of each connection segment 123 and the end surface S2 of the stator core 411 away from the center hole CH of the stator core 411 along the radial direction of the stator core 411 is greater than 0 degree and less than 90 degrees.

[0123] In one embodiment, an angle between each avoidance groove 124 and an 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.

[0124] That is to say, the length direction of each avoidance groove 124 has an angle θ with respect to the thickness direction of the connecting section 122, thereby reducing the bending angle of each jumper section 122a relative to the straight section 121, thereby avoiding a large bending of the jumper section 122a relative to the straight section 121 and reducing the impact on the connection strength of the flat wire winding 410 in the flat wire motor 400.

[0125] In the flat wire motor 400 provided in the embodiment of the present application, the winding slot G in the stator core 411 of the motor stator 410 adopts a narrow slot, and a connecting section 123 or an avoidance slot 124 is provided at the connection between each bridging section 122a of each continuous wave wound flat wire 120 in the stator winding 412 and the straight section 121 to form a narrow waist section, so that the narrow waist section of the continuous wave wound flat wire 120 is used to avoid the narrow slot of the stator core 411, so as to realize the continuous wave wound flat wire 120 being installed 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 in the embodiment of the present application, not only does it not need to widen the slot of the winding slot G, but it can also realize the assembly of the continuous wave wound flat wire 120 along the axial direction of the stator core 411, which can not only improve the assembly efficiency of the motor stator 410, but also take into account the NVH performance of the flat wire motor 400.

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

[0127] The powertrain 10 provided in the embodiment of the present application includes the flat wire motor 400 described above, and the structure of the stator winding 412 in the motor stator 410 of the flat wire motor 400 can reduce the axial dimension of the powertrain, which is conducive to the miniaturization of the powertrain 10. In addition, the stator core 411 in the motor stator 410 of the flat wire motor 400 in the powertrain 10 provided in the embodiment of the present application adopts a narrow slot structure, thereby improving the NVH performance of the powertrain, which is conducive to improving the NVH performance of the powertrain 10. In addition, the structural design of the flat wire motor 400 can avoid the wear and deformation of the stator winding 412 during the insertion of 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 powertrain 10.

[0128] The electric vehicle provided in the embodiment of the present application includes the powertrain 10 or the flat wire motor 400 as described above. The miniaturization of the powertrain 10 or the flat wire motor 400 can increase the interior space of the electric vehicle. The improvement of the power performance and NVH performance of the powertrain 10 or the flat wire motor 400 can also improve the driving experience of the electric vehicle.

[0129] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A flat wire motor, characterized in that: The motor stator of the flat wire motor comprises a stator core and a stator winding, wherein the stator core comprises a center hole and a plurality of winding slots, each of the winding slots and the center hole penetrates the two end surfaces of the stator core along the axial direction of the stator core, the center hole is used to accommodate the motor rotor of the flat wire motor, and the slot opening of each winding slot faces the center hole, the stator winding comprises a plurality of continuous wave wound flat wires, each of the continuous wave wound flat wires comprises two lead-out ends, a plurality of straight segments and a plurality of bridging segments, each of the straight segments is respectively arranged in a winding slot, and the two ends of each bridging segment are respectively used to connect two straight segments in different winding slots, and each lead-out end is used to connect a straight segment, wherein: A portion of the bridging segments in each of the continuous wave wound flat wires is exposed on one of the end faces of the stator core along the axial direction of the stator core, and two ends of each of the bridging segments in the portion of the bridging segments are connected to two straight line segments via two connecting segments respectively; Along the circumference of the stator core, the slot width of each winding slot is a first width, the slot 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 line segment or each bridge 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: Another part of the bridging section and the two lead ends of each continuous wave wound flat wire are exposed at another end surface of the stator core along the axial direction of the stator core, and both ends of each bridging section in the other part of the bridging section are directly connected to the two straight line sections respectively.

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

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

5. The flat wire motor according to any one of claims 1 to 4, characterized in that: Each of the connecting sections includes two side surfaces, each of the two side surfaces includes two avoidance grooves, the groove openings of the two avoidance grooves face opposite directions, and the groove bottom spacing of the two avoidance grooves is smaller than the groove opening width of each of the winding grooves.

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

7. The flat wire motor according to claim 5, characterized in that: A plurality of straight line segments are sequentially arranged in the same winding slot along the radial direction of the stator core, and the spacing between a plurality of avoidance grooves and the one end face in a plurality of connecting segments connected by the plurality of straight line segments increases sequentially along a direction away from the one center hole.

8. The flat wire motor according to claim 5, characterized in that: An angle between each of the avoidance grooves and the one end surface, which is away from the one central hole in the radial direction 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 avoidance grooves is greater than the thickness of each of the straight line segments and the thickness of each of the bridging segments.

10. The flat wire motor according to claim 5, characterized in that: The notch openings of the two avoidance grooves in each connecting section face away from each other along the circumferential direction of the stator core.

11. The flat wire motor according to claim 5, characterized in that: The bottom width of each avoidance groove is smaller than the groove opening width.

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

13. The flat wire motor according to any one of claims 1 to 12, characterized in that: Each of the winding slots comprises two slot walls arranged opposite to each other along the circumferential direction of the stator core, each of the slot walls comprises a first slot wall section and a second slot wall section, and the first slot wall section and the second slot wall section of each of the slot walls are arranged in sequence along the radial direction of the stator core away from the one central hole, wherein: The first section of the slot wall in each slot wall in each winding slot is bent toward another slot wall, and the distance between two first sections of the slot walls in each winding slot is smaller than the distance between two second sections of the slot walls.

14. A powertrain, characterized in that: The power assembly includes a reducer and a flat wire motor as claimed in any one of claims 1 to 13, wherein a motor shaft of the flat wire motor is used for transmission connection with an input shaft of the reducer.

15. An electric vehicle, characterized in that: The electric vehicle comprises wheels, a transmission mechanism and the powertrain as claimed in claim 14, wherein the powertrain is used to drive the wheels through the transmission mechanism.

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