Stator, motor and vehicle

Abstract

This utility model discloses a stator, motor, and vehicle, relating to the field of motor technology. The stator includes a stator core and multiple flat wire structures. Each flat wire structure has two connecting ends. At least one connecting end has an end face that exposes the core wire of the flat wire structure to the insulation layer, and two adjacent exposed side faces. One of the two exposed side faces is a mating surface, and the other is a welding surface. The two connecting ends are intersected and welded together. One of the mating surfaces is stepped to form a contact surface and a stepped surface that is angled to the contact surface and faces the end face. The contact surface is used to fit against the mating surface of the other flat wire structure, and the welding surface is used to be adjacent to the welding surface of the other flat wire structure. A weld is formed at the junction of the two welding surfaces, and the stepped surface is located at one end of the weld. This design can block the laser beam during laser welding, improving product reliability.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to stators, motors and vehicles. Background Technology

[0002] Flat wire structures are mostly used in electromagnetic drive technology. Taking new energy motors as an example, based on the requirements for power density, torque density and cost of the product, there are requirements for the winding form and the power connection form. In the current winding laser welding method, there is a problem that the laser leaks out from the welding gap and damages the winding enamel film. Utility Model Content

[0003] The main purpose of this invention is to propose a stator, motor, and vehicle that aims to avoid damage to the underlying paint layer caused by laser penetration through the weld seam, thereby improving the insulation reliability of the product.

[0004] To achieve the above objectives, this utility model proposes a stator, comprising:

[0005] Stator core; and,

[0006] Multiple flat wire structures are wound on the stator core. Each flat wire structure has two connecting ends. At least one of the connecting ends has an end face of the core wire of the flat wire structure that exposes the insulation layer, and two adjacent exposed side faces. One of the two exposed side faces is a joint surface, and the other is a welding surface.

[0007] In this design, two adjacent connecting ends of two flat wire structures in the circumferential direction of the stator core are welded together. The two welded connecting ends are arranged crosswise. One of the mating surfaces is stepped to form a contact surface and a stepped surface that is angled to the contact surface and faces the end face. The contact surface is in contact with the mating surface of the other flat wire structure. The welding surface is used to be adjacent to the welding surface of the other flat wire structure, and a weld is formed at the junction of the two welding surfaces. The stepped surface is located at the end of the weld that faces away from the welding surface.

[0008] In one embodiment, of the two welded ends, the stepped surface on one of the welded ends is used to abut against the side surface of the other flat wire structure welded end.

[0009] In one embodiment, the stepped surface is inclined to the centerline of the corresponding connecting end.

[0010] In one embodiment, the side of the mating surface away from the welding surface is connected to the side of the connecting end by a transition arc surface;

[0011] In the two welded connection ends, the transition arc surface of one of the connection ends abuts against the stepped surface of the other flat wire structure.

[0012] In one embodiment, the center line of the connection end is inclined relative to the center line of the core wire.

[0013] In one embodiment, both of the connection ends are exposed outside the insulating layer.

[0014] In one embodiment, the welding surface, the bonding surface, and the step surface are all configured as cutting surfaces.

[0015] In one embodiment, the welding surface is inclined in a direction away from the end face toward the centerline of the connection end.

[0016] In one embodiment, the connecting end is tapered in the direction of its end face near the connecting end.

[0017] In one embodiment, the stator core is arranged in a ring shape, and the inner sidewall of the stator core is provided with a plurality of grooves that are spaced apart along the circumference of the stator core. The grooves are arranged through both ends along the axial direction of the stator core.

[0018] The flat wire structure includes a winding body, the middle of which is bent to form two winding segments. Each winding segment includes a first extension segment and a second extension segment arranged at an angle. The two first extension segments of the two winding segments are connected and are respectively located in two of the grooves. The two second extension segments extend in a direction away from each other.

[0019] The portion of the core wire corresponding to the ends of the two second extension segments forms the connection end.

[0020] This utility model also proposes an electric motor, including the stator described above.

[0021] This utility model also proposes a vehicle that includes the aforementioned motor.

[0022] In this invention, two interconnecting ends are cross-arranged to form an xpin winding from multiple flat wire structures. Two connecting ends of corresponding flat wire structures are laterally aligned. One contact surface is used to contact the contact surface of another flat wire structure, making the two welding surfaces adjacent and forming a weld at their intersection. Due to the step design on one of the contact surfaces, with the step facing the end face and located on the side of the contact surface away from the end face, the step surface naturally lies on the side of the weld away from the welding surface when the two connecting ends are engaged. This shields the weld, ensuring that even if the laser beam passes through the weld during laser welding, it only illuminates the step surface, preventing damage to the insulation layer of other segments of the flat wire structure and improving product reliability. Furthermore, the step surface increases the welding area when welding the two flat wire structures, thus enhancing the welding connection strength. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the first embodiment of the flat wire structure provided by this utility model (testing a single steel strip);

[0025] Figure 2 for Figure 1 A schematic diagram of two flat line structures mating (two mating surfaces facing each other);

[0026] Figure 3 for Figure 2 A schematic diagram of the fit between two flat wire structures (two mating surfaces);

[0027] Figure 4 for Figure 2 A schematic diagram of the structure of the other connecting end;

[0028] Figure 5 for Figure 2 A schematic diagram of the structure of the middle connection end;

[0029] Figure 6 for Figure 1 A schematic diagram of another assembly state of the medium-flat wire structure;

[0030] Figure 7 for Figure 1 Schematic diagram of the middle stator core;

[0031] Figure 8 for Figure 1 A schematic diagram of the mating of the flat wire winding and the fixture;

[0032] Figure 9 This is a schematic diagram of the processing steps for the connecting end in this utility model.

[0033] Explanation of icon numbers:

[0034] 1000, Stator; 100, Flat wire structure; a, Core wire; b, Insulation layer; 1, Connecting end; 11, End face; 12, Joint surface; 13, Welding surface; 141, Contact surface; 142, Step surface; 15, Transition arc surface; 16, Weld; 1a, Exposed side; 2, Winding section; 21, First extension section; 22, Second extension section; 200, Stator core; 210, Groove; 300, Fixture.

[0035] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] It should be noted that if the embodiments of this utility model involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0038] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0039] With technological advancements, the requirements for power density, torque density, and cost of new energy motors are increasing. The latest Xpin motor solution improves power and torque density compared to the existing mass-produced Hair-pin solution, while also increasing raw material costs. However, it still suffers from many problems such as unstable connection after winding and welding, and short creepage distance.

[0040] Meanwhile, when using laser welding to connect the windings, due to processing issues, there may be gaps in the weld 16 formed by splicing adjacent windings. When laser welding is performed, the laser beam will pass through the weld 16 and irradiate the lower enameled wire, causing damage to the enamel coating.

[0041] In view of this, the present invention provides a flat wire structure to avoid damage to the lower enameled wire coating caused by light leakage during laser welding, thereby improving the insulation reliability of the product.

[0042] Please refer to Figures 1 to 3 The stator includes a stator core 200 and multiple flat wire structures 100. The multiple flat wire structures 100 are wound on the stator core 200 and are presented in the form of flat wire windings on the stator core 200. The flat wire structure 100 consists of a core wire a and an insulation layer b covering the core wire a. The flat wire structure 100 has two connecting ends 1. At least one connecting end 1 has an end face 11 of the core wire a exposed from the insulation layer b, and two exposed side faces 1a of the core wire a exposed from the insulation layer b and arranged adjacent to each other. One of the two exposed side faces 1a is a joint surface 12 and the other is a welding surface 13.

[0043] In this configuration, two adjacent connecting ends 1 of two flat wire structures 100 in the circumferential direction of the stator core 200 are welded together. The two connecting ends 1 are welded to each other and are arranged crosswise. One of the mating surfaces 12 is stepped to form a contact surface 141 and a stepped surface 142 that is angled to the contact surface 141 and faces the end face 11. The contact surface 141 is used to fit with the mating surface 12 of the other flat wire structure 100. The welding surface 13 is used to be adjacent to the welding surface 13 of the other flat wire structure 100, and a weld 16 is formed at the junction of the two welding surfaces 13. The stepped surface 142 is located on the side of the weld 16 that is away from the welding surface 13.

[0044] In the technical solution of this utility model, two connecting ends 1 welded together are arranged in a cross configuration, so that multiple flat wire structures 100 form an xpin winding. The two connecting ends 1 of the corresponding two flat wire structures 100 are laterally aligned, and one contact surface 141 is used to contact the contact surface 12 of the other flat wire structure 100, so that the two welding surfaces 13 are adjacent, and a weld 16 is formed at the junction of the two welding surfaces 13. Since one of the contact surfaces 12 is stepped, the stepped surface 142 is set facing the end face 11 and is located on the side of the contact surface 141 away from the end face 11. Therefore, when the two connecting ends 1 are contacted and fitted, the stepped surface 142 can naturally be located to the side of the weld 16, thereby shielding the weld 16. So that during laser welding, even if the laser beam passes through the weld 16, it will only illuminate the stepped surface 142, thereby avoiding damage to the insulation layer b of other segments of the flat wire structure 100 through the weld 16, and improving the reliability of the product. Meanwhile, the step surface 142 increases the welding area when the two flat wire structures 100 are welded, thereby enhancing the welding connection force.

[0045] Core wire a serves as a conductor for current transmission; insulation layer b is attached to the surface of the conductor, serving to isolate current flow between adjacent conductors. In some embodiments, the flat wire structure 100 is an enameled wire, insulation layer b is a enamel coating, and core wire a is a copper wire.

[0046] When two flat wire structures 100 are welded together, the two adjacent connecting ends 1 of the two flat wire structures 100 are welded together, so that the current conduction of the two flat wire structures 100 is realized after the welding is completed.

[0047] Specifically, multiple flat wire structures 100 are connected according to certain requirements and twisted at a certain angle to form a flat wire winding. The flat wire winding passes through the interior and both ends of the stator core 200, so that after winding, it can partially protrude from the stator core 200 on both sides of its axial direction. The part of the flat wire winding protruding from both sides of the stator core 200 forms a crown end and a welded end. The core wire a at the crown end is covered by an insulating layer b. After multiple connecting ends 1 are welded together, they form corresponding welded ends. At the welded end, the mating surface 12 and the contact surface 141 of two adjacent flat wire structures 100 are attached, so that the corresponding two welding surfaces 13 are close together to form a weld 16. The weld 16 is laser welded, so that the multiple flat wire structures 100 can conduct current.

[0048] It should be noted that when welding the winding structure 100, one end of each winding structure can be welded by fitting the stepped surface 141 and the mating surface 12 together, and the other end can also adopt this fitting structure, or other butt fitting forms can be adopted. This utility model does not limit this.

[0049] During welding, the two connecting ends 1 are attached to each other through the mating surface 12 set laterally. At this time, it is necessary to consider not only the welding continuity of the core wire a, but also the overall height of the two flat wire structures 100 after welding. Therefore, by setting both the welding surface 13 and the mating surface 12 on the periphery of the connecting ends, the two flat wire structures 100 can overlap and fit through the side of the winding when welding, which helps to reduce the welding height.

[0050] In actual processing, due to processing errors or unevenness in the fit of the welding surfaces 13, the mating surfaces 12 and 141 may not fit together properly during welding, resulting in a larger gap and an increase in the weld seam 16. Therefore, please refer to... Figure 4 and Figure 5 In the two welded connecting ends 1, the stepped surface 142 is used to abut against the side of the connecting end 1 of the other flat wire structure 100. That is, the stepped surface 142 not only has the function of blocking laser, but also has the function of guiding the connection ends 1 of the two flat wire structures 100. By abutting against the side of the other connecting end 1 with the stepped surface 142, the guiding is achieved, which ensures that the corresponding mating surfaces 12 and the contact surfaces 141 are in contact, thereby ensuring that the two corresponding welding surfaces 13 are close to each other.

[0051] In some implementations, the stepped surface 142 is inclined to the centerline of the connecting end 1. This invention does not limit the inclination range or direction of the stepped surface 142, and it can be reasonably set according to the actual mating orientation. For example, in this embodiment, the stepped surface 142 is inclined in a direction gradually away from the centerline of the end face 11 in the direction away from the end face 11. In this case, the angle between the stepped surface 142 and the mating surface 141 is an obtuse angle. In other embodiments, the stepped surface 142 can also be inclined along the width direction of the core line a. Of course, the stepped surface 142 can also be perpendicular to the mating surface 141, and this invention does not limit this.

[0052] It should be understood that the dimensions of the step surface 142 are not limited, as long as it contacts the corresponding position of the connecting end 1 to form a guide. The thickness of the connecting end 1 after the step surface 142 is removed needs to be taken into account. This ensures the connection strength and prevents the area from easily breaking after welding.

[0053] Specifically, the side of the mating surface 12 away from the welding surface 13 is connected to the side of the connecting end 1 via a transition arc surface 15; in the two connecting ends 1 that are welded together, the transition arc surface 15 of one connecting end 1 abuts against the stepped surface 142 of the other flat wire structure 100. In some flat wire structures 100, in order to facilitate the covering of the insulation layer b, the internal circumferential corners are generally rounded to facilitate the covering fit. The transition arc surface 15 here can be obtained separately through processing, or it can be naturally formed on the surface of the core wire a in the early stage of manufacturing the flat wire structure 100.

[0054] To ensure the orientation of the step surface 142, the center line of the connecting end 1 is inclined relative to the center line of the core wire a. That is, during processing, the flat wire structure 100 is bent to form the part of the connecting end 1, thereby adapting to the orientation relationship when the contact surface 141, the mating surface 12, the welding surface 13 and the step surface 142 are mated.

[0055] It should be noted that the inclination of the two connecting ends 1 of the welding fit can be the same or different, that is, the inclination angle of the two connecting ends 1 in each flat wire structure 100 relative to the center line of the core wire a can be the same or different.

[0056] In this embodiment of the invention, both connecting ends 1 are exposed to the insulating layer b. That is, the insulating layer b on the outer periphery of the end of the core wire a is peeled off in advance, so that the end of the core wire a is exposed to the air, thereby forming the connecting end 1. At this time, the peripheral side surface and the end surface 11 of the connecting end 1 are both exposed surfaces.

[0057] It should be noted that, of the two connecting ends 1, the mating surface 12 of one of the connecting ends 1 does not require processing. The end face 11 that is naturally formed after the insulation layer b is peeled off can be used as the mating surface 12. The mating surface 12 of the other connecting end 1 is formed by cutting to form the bonding surface 141 and the step surface 142.

[0058] Based on the above embodiments, the welding surface 13 can be arranged parallel to the center line of the connecting end 1. Considering that if the connecting end 1 is exposed to the insulation layer b, the rounded corners on the surface of the core wire a will form a gap when the welding surface 13 is adjacent to it, which will affect the welding effect, a portion of the material is removed from the surface of the connecting end 1 of the core wire a to obtain a plane parallel to the center line of the connecting end 1, and this plane is used as the welding surface 13.

[0059] The welding surface 13, the bonding surface 141, and the step surface 142 are all set as cutting surfaces, that is, they are obtained by cutting.

[0060] Please refer to Figure 2In this embodiment, the welding surface 13 is inclined to the centerline of the connecting end 1. That is, an inclined surface is obtained by oblique cutting on one side of the connecting end 1 of the core wire a, and this inclined surface serves as the welding surface 13. Specifically, the welding surface 13 is inclined in a direction gradually away from the centerline of the connecting end 1 in the direction away from the end face 11.

[0061] It should be noted that in the two connecting ends 1 that are welded together, the corresponding two welding surfaces 13 are adjacent. However, due to the influence of factors such as the fitting angle and machining accuracy, the two welding surfaces 13 may be on the same plane, may be set at an angle, or may be parallel to each other.

[0062] To facilitate the application and installation of the flat wire structure 100, the connecting end 1 is tapered in the direction of its end face near the connecting end, that is, the cross-sectional area of ​​the two connecting ends 1 is tapered in the direction away from each other. With this arrangement, when the flat wire structure 100 is applied and installed, the connecting end 1 can also serve as an installation guide end, making it easier to pass through the corresponding slot.

[0063] It should be noted that, in addition to the inclined design of the welding surface, the remaining exposed side 1a of the connecting end 1 can also be inclined relative to the center line of the end face 11 or parallel to the center line of the end face 11, as long as the connecting end 1 has a tapered design as a whole.

[0064] This utility model does not limit the specific form of the flat wire structure 100. In specific application scenarios, the flat wire structure 100 can be bent to adapt to the installation environment. In some embodiments, please refer to Figure 6 The flat wire structure 100 includes a winding body, the middle of which is bent to form two winding segments 2. Each winding segment 2 includes a first extension segment 21 and a second extension segment 22 arranged at an angle. The two first extension segments 21 of the two winding segments 2 are connected, and the two second extension segments 22 extend in a direction away from each other. The portion of the core wire a corresponding to the end of the two second extension segments 22 forms a connecting end 1. The two first extension segments 21 can be connected in a V-shape or a U-shape, which can be reasonably designed according to the specific application scenario. The two second extension segments 22 extend in a direction away from each other. In the two connecting ends 1 that are welded together, the end of the second extension segment 22 overlaps with the end of the second extension segment 22 of the other flat wire structure 100 in the horizontal direction, thereby achieving the bonding surface 12 and the contact surface 141 of the two connecting ends 1.

[0065] According to the requirements of magnetic field coordination, the portion of the flat wire structure 100 located at the welding end needs to be twisted at a certain angle to achieve the corresponding function. This results in the flat wire structure 100 exhibiting a shape with a first extension 21 and a second extension 22 arranged at an angle. Based on the effect of the two connecting ends 1 being inclined relative to the centerline of the core wire a, thereby achieving the fit between the step surface 141 and the transition arc surface 15, the end of the second extension 22 is further bent at a certain angle to achieve the fit requirement.

[0066] For further details, please refer to Figure 7 The stator core 200 is arranged in a ring shape. Multiple grooves 210 are spaced apart along the circumference of the stator core 200 on its inner sidewall. Each groove 210 extends through both ends along the axial direction of the stator core 200, and multiple flat wire structures 100 are wound within each groove 210. Specifically, the two first extensions 21 of the two winding segments 2 are located in two of the grooves 210, which serve as winding grooves, providing positioning and guidance for the installation of the flat wire structures 100. The winding installation is achieved by inserting the connecting end 1 of the flat wire structure 100 through the groove 210 along the axial direction of the stator core 200.

[0067] To prevent the flat wire structure 100 near the opening of the groove 210 from coming off, a limiting protrusion is provided at the opening of the groove 210 so that the opening size of the groove 210 is smaller than the wire diameter of the flat wire structure 100, thereby achieving the effect of limiting and preventing detachment.

[0068] In the embodiments of this utility model, please refer to Figure 1 , Figure 2 ,and Figure 8 The structure and manufacturing process of stator 1000 are as follows:

[0069] The stator 1000 includes a stator core 200 and a flat wire winding. The stator core 200 includes a certain number of grooves 210, which can be 48, 54, or 72. The flat wire winding consists of multiple flat wire structures 100 assembled in the multiple grooves 210. The flat wire winding is exposed at both ends of the stator core 200 along the axial direction, namely a welding end and a crown end. The welding end contains several flat wire structures 100 distributed circumferentially along the stator core 200. The several flat wire structures 100 are welded together by connecting ends 1. The ends of the flat wire structures 100 are bent beforehand, and the enameled wire at the ends is removed, thus obtaining two exposed connecting ends 1. The inclination angle of the two connecting ends 1 is adjusted according to the actual fit. One of the connecting ends 1 has an end face 11, a welding surface 13, a mating surface 12, and a transition arc surface 15. The end face 11 is obtained by cutting the raw material coil. The welding surface 13 is obtained by starting from the end face 11 and following a predetermined cutting path; the mating surface 12 and the transition arc surface 15 are both exposed surfaces naturally formed after the insulation layer is peeled off from the connecting end 1, requiring no further processing. The other connecting end 1 has an end face 11, a welding surface 13, a bonding surface 141, and a stepped surface 142; the end face 11 is obtained by cutting the raw material roll. The welding surface 13 is obtained by starting from the end face 11 and following a predetermined cutting path. After processing the welding surface 13, the mating surface 12 is cut from the end face 11 according to the predetermined cutting path (see...). Figure 9 Thus, the bonding surface 141 and the step surface 142 are obtained, and the step surface 142 and the bonding surface 141 are set at an obtuse angle.

[0070] During welding of adjacent flat wire structures 100, the mating surfaces 12 and contact surfaces 141 of the two adjacent connecting ends 1 are first aligned and made parallel, with the distance between the mating surfaces 12 and contact surfaces 141 not exceeding 1 mm. Then, the two connecting ends 1 are pressed by the fixture 300, causing the transition arc surface 15 and the step surface 142 to contact. Under the guidance of the fixture, the two connecting ends 1 approach each other, making the mating surfaces 12 and contact surfaces 141 fit together, thus ensuring that the two welding surfaces 13 are close together, forming a weld 16. At this time, the mating surface 12 extends vertically, and the welding surface 13 extends horizontally. The weld 16 is connected by laser welding. When the laser beam is welding, it penetrates the weld 16 and irradiates the step surface 142, avoiding direct irradiation of the lower insulating layer b and causing damage to the insulating layer b. The fixture 300 is arranged in a ring, so that several flat wire structures 100 on the circumference can be pressed, thus allowing several weld seams on the circumference to be welded simultaneously.

[0071] This utility model also proposes an electric motor, which includes a stator 1000. The specific structure of the stator 1000 is as described in the above embodiments. Since this electric motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0072] It should be noted that this motor can be used in home appliances, industrial equipment, vehicles, etc.

[0073] This utility model also proposes a vehicle, which includes a motor. The specific structure of the motor is as described in the above embodiments. Since this vehicle adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0074] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A stator, characterized in that, include: Stator core; as well as, Multiple flat wire structures are wound on the stator core. Each flat wire structure has two connecting ends. At least one of the connecting ends has an end face that exposes the core wire of the flat wire structure to the insulation layer, and two adjacent exposed side faces. One of the two exposed side faces is a joint surface, and the other is a welding surface. In this configuration, two adjacent connecting ends of two flat wire structures in the circumferential direction of the stator core are welded together. The two welded connecting ends are arranged crosswise, and one of the mating surfaces is stepped to form a contact surface and a stepped surface that is angled to the contact surface and faces the end face. The contact surface is in contact with the mating surface of the other flat wire structure. The two welding surfaces are adjacent to each other, and a weld is formed at the intersection of the two welding surfaces. The stepped surface is located on the side of the weld that faces away from the welding surface.

2. The stator as described in claim 1, characterized in that, In the two welded connection ends, the stepped surface on one connection end abuts against the side surface of the connection end of the other flat wire structure.

3. The stator as described in claim 1 or 2, characterized in that, The stepped surface is inclined to the center line of the corresponding connecting end.

4. The stator as described in claim 3, characterized in that, The side of the mating surface away from the welding surface is connected to the side of the connecting end by a transition arc surface; In the two welded connection ends, the transition arc surface of one of the connection ends abuts against the stepped surface of the other flat wire structure.

5. The stator as described in claim 1, characterized in that, The centerline of the connection end is inclined relative to the centerline of the core wire.

6. The stator as described in claim 1, characterized in that, Both of the connection ends are exposed outside the insulating layer.

7. The stator as described in claim 1, characterized in that, The welding surface, the bonding surface, and the step surface are all designed as cutting surfaces.

8. The stator as described in claim 1, characterized in that, The welding surface is inclined in a direction away from the end face, gradually moving away from the center line of the connection end.

9. The stator as described in claim 1, characterized in that, The connection end is tapered in the direction of the end face near the connection end.

10. The stator as claimed in claim 1, characterized in that, The stator core is arranged in a ring shape, and the inner sidewall of the stator core is provided with a plurality of grooves that are spaced apart along the circumference of the stator core. The grooves are arranged to pass through both ends along the axial direction of the stator core. The flat wire structure includes a winding body, the middle of which is bent to form two winding segments. Each winding segment includes a first extension segment and a second extension segment arranged at an angle. The two first extension segments of the two winding segments are connected and are respectively located in two of the grooves. The two second extension segments extend in a direction away from each other. The portion of the core wire corresponding to the ends of the two second extension segments forms the connection end.

11. An electric motor, characterized in that, Includes the stator as described in any one of claims 1 to 10.

12. A vehicle, characterized in that, Including the motor as described in claim 11.

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