Stator assembly, wheel hub motor and electric vehicle

Abstract

The application provides a stator assembly, a wheel hub motor and an electric vehicle with the stator assembly. The stator assembly comprises a stator component, a winding and a limiting frame. The stator component comprises a tooth part without a tooth shoe and a closed yoke part with a certain thickness, and the tooth part is distributed on the outer periphery of the yoke part. The winding is arranged on the tooth part. The limiting frame is connected with the stator component, and is used for limiting the radial position of the winding relative to the tooth part. The stator assembly of the embodiment can improve the material utilization rate of the silicon steel sheet by arranging the tooth part without the tooth shoe. Meanwhile, the tooth part without the tooth shoe is beneficial to the winding to be completed on the external tooling and then to be radially inserted into the tooth part. Since the winding is not positioned by the tooth shoe, the winding has the risk of sliding out of the tooth part, and the limiting frame can effectively prevent the winding from sliding out of the tooth part, so as to ensure the stable and reliable product performance.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator assembly, a hub motor and an electric vehicle. Background Art

[0002] In outer rotor motors, the silicon steel material utilization rate in stator assemblies is low and the silicon steel waste rate is high. Currently, stator assemblies for outer rotor motors generally use wound iron cores, which can improve material utilization rate to a certain extent. However, most stator assemblies have tooth boots. Due to the presence of tooth boots, the material utilization rate can only reach 70% at most. If a tooth boot-free straight tooth stator assembly structure is used, the radial positioning of the winding is difficult to ensure, and the use of adhesive fixation has the risk of falling off and poor reliability. Summary of the Invention

[0003] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, the present invention proposes a stator assembly that utilizes a toothed portion without toothed boots to improve silicon steel material utilization. A retaining frame is provided to prevent the winding from falling off the toothed portion, thereby improving silicon steel material utilization while ensuring product performance and reliability.

[0004] The present invention also provides a hub motor having the above-mentioned stator assembly.

[0005] The present invention also provides an electric vehicle having the above-mentioned hub motor.

[0006] According to an embodiment of the first aspect of the present invention, the stator assembly includes a stator component, a winding and a limit frame, the stator component includes a tooth portion without a tooth boot and a yoke portion having a certain thickness and forming a closed portion, the tooth portion is distributed on the outer periphery of the yoke portion; the winding is arranged on the tooth portion; the limit frame is connected to the stator assembly, and the limit frame is used to limit the radial position of the winding relative to the tooth portion.

[0007] The stator assembly according to the embodiment of the present invention has at least the following beneficial effects: the stator assembly is generally cut from silicon steel sheets. If the teeth are provided with tooth boots, when cutting the silicon steel sheets, the material cutting method must be designed according to the tooth boots to improve the utilization rate of the silicon steel sheets. However, no matter how it is optimized, in the case of tooth boots, the material utilization rate of the silicon steel sheets can only reach 70% at most, and it is difficult to improve it further. The stator assembly of this embodiment can further improve the material utilization rate of the silicon steel sheets by providing a tooth portion without tooth boots. At the same time, the tooth portion without tooth boots is conducive to completing the winding of the winding on the external tooling and then radially inserting it into the tooth portion; due to the lack of tooth boots to position the winding, the winding is at risk of slipping out of the tooth portion, and the limit frame can effectively prevent the winding from slipping off the tooth portion, ensuring stable and reliable product performance.

[0008] According to some embodiments of the present invention, two opposite side walls of the tooth portion are arranged in parallel.

[0009] According to some embodiments of the present invention, the tooth width of the tooth portion is L1, and the distance between the tooth roots of adjacent tooth portions along the circumference of the yoke portion is L2, satisfying: 1mm≤(L2-L1)≤3mm.

[0010] According to some embodiments of the present invention, the limiting frame includes a mounting portion and a limiting portion, the mounting portion is connected to the stator assembly, the limiting portion is arranged on one side of the mounting portion, and the limiting portion cooperates with the outer end surface of the winding.

[0011] According to some embodiments of the present invention, the limiting portion includes two fork rods, the distance between the two fork rods is adapted to the width of the tooth portion, and the fork rods abut against the outer end surface of the winding.

[0012] According to some embodiments of the present invention, the winding has an outlet head, and a bridge connection line is provided on the other side of the mounting portion, and the bridge connection line is electrically connected to the outlet head.

[0013] According to some embodiments of the present invention, a copper-aluminum transition terminal is provided on the other side of the mounting portion.

[0014] According to some embodiments of the present invention, a stator bracket is fixedly installed in the yoke, and the limiting frame is detachably connected to the stator bracket.

[0015] According to some embodiments of the present invention, the limiting frame is mounted on the stator bracket via a snap-fit ​​structure or screws.

[0016] According to some embodiments of the present invention, the cross-section of the wire used in the winding is one or more of rectangular and oval.

[0017] According to some embodiments of the present invention, the winding uses aluminum enameled wire.

[0018] A hub motor according to an embodiment of a second aspect of the present invention includes the stator assembly described in the embodiment of the first aspect.

[0019] The in-wheel motor according to the embodiment of the invention has at least the following beneficial effects: the stator components in the stator assembly are generally cut from silicon steel sheets. If the teeth are provided with tooth boots, when cutting the silicon steel sheets, the material cutting method must be designed based on the tooth boots to improve the utilization rate of the silicon steel sheets. However, no matter how it is optimized, the material utilization rate of the silicon steel sheets can only reach 70% at most when the tooth boots are provided, and it is difficult to increase it further. The stator assembly in the in-wheel motor of this embodiment can further improve the material utilization rate of the silicon steel sheets by providing a tooth portion without tooth boots. At the same time, the tooth portion without tooth boots facilitates winding the winding on the external tooling and then radially inserting it into the teeth. Due to the lack of tooth boots to position the winding, there is a risk of the winding slipping out of the teeth. The limit frame can effectively prevent the winding from slipping out of the teeth, ensuring stable and reliable product performance.

[0020] An electric vehicle according to an embodiment of a third aspect of the present invention includes the hub motor described in the embodiment of the second aspect.

[0021] According to the electric vehicle of the embodiment of the invention, there are at least the following beneficial effects: the stator components in the stator assembly are generally cut from silicon steel sheets. If the teeth are provided with tooth boots, when cutting the silicon steel sheets, the material cutting method must be designed according to the tooth boots to improve the utilization rate of the silicon steel sheets. However, no matter how it is optimized, in the case of tooth boots, the material utilization rate of the silicon steel sheets can only reach 70% at most, and it is difficult to improve it further. The stator assembly in the electric vehicle of this embodiment can further improve the material utilization rate of the silicon steel sheets by providing a tooth portion without tooth boots. At the same time, the tooth portion without tooth boots is conducive to completing the winding on the external tooling and then radially inserting it into the tooth portion; due to the lack of tooth boots to position the winding, the winding is at risk of slipping out of the tooth portion, and the limit frame can effectively prevent the winding from slipping off the tooth portion, ensuring stable and reliable product performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of an embodiment of a stator assembly of the present invention;

[0023] Figure 2 for Figure 1 AA section view in;

[0024] Figure 3 for Figure 1 A partial enlarged view of point B in the middle;

[0025] Figure 4 for Figure 2 A partial enlarged view of the middle C section;

[0026] Figure 5 It is a schematic assembly diagram of a stator component, a stator bracket and a winding in a stator assembly of an embodiment of the present invention;

[0027] Figure 6A schematic diagram of an embodiment of a stator component in a stator assembly of the present invention;

[0028] Figure 7 Schematic diagram of an embodiment of the limit frame in the stator assembly of the present invention Figure 1 ;

[0029] Figure 8 Schematic diagram of an embodiment of the limit frame in the stator assembly of the present invention Figure 2 ;

[0030] Figure 9 The stator component punching structure in the stator assembly of the present invention;

[0031] Figure 10 It is a schematic diagram of the stator component punching and arranging in the stator assembly of the present invention.

[0032] Reference numerals: stator assembly 100; tooth portion 110; yoke portion 120; stator bracket 130;

[0033] Winding 200; Outlet 210;

[0034] Limiting frame 300; mounting portion 310; limiting portion 320; fork rod 330; connecting rod 340;

[0035] Bridge connection line 400. DETAILED DESCRIPTION

[0036] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0037] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In the description of the present invention, "a plurality" refers to more than two. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.

[0039] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0040] like Figures 1 to 10 As shown, an embodiment of the first aspect of the present invention provides a stator assembly for an external rotor motor, wherein the stator assembly includes a stator component 100, a winding 200 and a limit frame 300. The stator component 100 includes a tooth portion 110 without a tooth shoe and a yoke portion 120 having a certain thickness and forming a closed portion. The tooth portion 110 without a tooth shoe means that the side wall of the tooth portion 110 has no outwardly extending structure for limiting the winding 200. Along the radial outward direction of the yoke 120, the cross-sectional area of ​​the tooth portion 110 remains unchanged or tends to decrease, and multiple teeth 110 are evenly distributed on the outer periphery of the yoke 120; the winding 200 is arranged on the tooth portion 110; the limit frame 300 is connected to the stator component 100, and the limit frame 300 is used to limit the radial position of the winding 200 relative to the tooth portion 110 to prevent the winding 200 from slipping off the tooth portion 110.

[0041] The stator assembly 100 is generally made of silicon steel sheets, and the cut silicon steel sheets are processed into a wound stator assembly 100. In order to improve the utilization rate of the silicon steel sheets, it is necessary to design the splicing cutting method in advance when cutting. If the tooth portion 110 is provided with a tooth shoe, when cutting the silicon steel sheet, the splicing cutting method must be designed according to the tooth shoe. However, no matter how it is optimized, the material utilization rate of the silicon steel sheet can only reach 70% at most when the tooth shoe is provided, and it is difficult to further improve it. Since the stator assembly of this embodiment does not have a tooth shoe, it is not necessary to consider the tooth shoe factor when designing the splicing cutting method. The splicing cutting method can be further optimized, thereby improving the material utilization rate of the silicon steel sheet. At the same time, the tooth portion 110 without a tooth shoe is conducive to the winding 200 being wound on the external tooling and then radially inserted into the tooth portion 110. If a tooth shoe is provided, the width of the tooth shoe must be greater than the width of the tooth portion 110. The winding 200 wound externally cannot be inserted into the tooth portion 110 and the winding 200 will be blocked by the tooth shoe. Due to the lack of tooth boots to position the winding 200, there is a risk that the winding 200 will slip out of the tooth portion 110. The limiting frame 300 can effectively prevent the winding 200 from slipping out of the tooth portion 110, ensuring stable and reliable product performance.

[0042] It should be noted that the connection between the limit frame 300 and the stator assembly 100 can be a fixed connection or a detachable connection; wherein, the fixed connection can be fixed by welding or riveting; wherein, the detachable connection can be connected by screws or a snap-on structure, etc.

[0043] Specifically, if Figure 6As shown, in some embodiments of the present invention, the two opposite side walls of the tooth portion 110 are arranged in parallel, that is, the tooth portion 110 is in the shape of a straight tooth, and the cross-section of the tooth portion 110 is constant and is in the shape of a rectangular parallelepiped. Thus, the tooth portion 110 on the stator assembly before winding is in the shape of a rectangular wave, as shown in FIG. Figure 9 As shown, this shape is conducive to the arrangement of materials. Figure 10 As shown, the silicon steel sheets can be fully utilized, the generation of waste can be reduced, and the utilization rate of silicon steel sheets can be improved.

[0044] In addition, when the tooth portion 110 is set to a straight tooth shape, the wire can be wound layer by layer during winding, and there is no special requirement for the shape of the wire. Therefore, it is suitable for wires of various shapes, facilitates the winding process of the winding 200, and reduces unstable factors in the winding process.

[0045] In the above embodiment, the winding 200 is wound externally using tooling, and the operating space is large. If the winding is directly performed on the tooth portion 110, some areas cannot be wound due to limited operating space, resulting in a limited slot fill rate, which is difficult to further improve. In this embodiment, compared with winding directly on the tooth portion 110, there is no need to worry about the problem of too small operating space, and the slot fill rate can be effectively improved.

[0046] like Figure 9 As shown, for the convenience of subsequent description, the tooth width of the tooth portion 110 is recorded as L1, and the distance between the tooth roots of adjacent tooth portions 110 along the circumference of the yoke 120 is recorded as L2. After a large number of experimental tests, it was found that when the relationship between L1 and L2 satisfies 1mm≤(L2-L1)≤3mm, the material utilization rate of the silicon steel sheet can be maximized under the premise of ensuring the feasibility of the high-speed precision stamping process. When this relationship is met, the material utilization rate of the silicon steel sheet can reach more than 86%; when the relationship between L1 and L2 satisfies (L2-L1)<1mm, the high-speed precision stamping process will be unable to meet the accuracy requirements of the punching sheet. When the relationship between L1 and L2 satisfies (L2-L1)>3mm, the material utilization rate of the silicon steel sheet is relatively low.

[0047] It should be noted that the implementation method of the tooth portion 110 is not limited to the above-mentioned method, and it can also be implemented in other ways. For example, the upper parts of the two opposite side walls of the tooth portion 110 can be relatively close to each other, so that the cross-sectional area of ​​the tooth portion 110 tends to become smaller along the radial outward direction of the yoke 120. At this time, when designing the splicing and cutting method, there is no need to consider the tooth boot factor, so the splicing and cutting method can be further optimized, thereby improving the material utilization rate of the silicon steel sheet. Moreover, since the tooth portion 110 is small at the top and large at the bottom, it can be beneficial to guide and align the winding 200 and the tooth portion 110 that are wound externally, thereby improving assembly efficiency.

[0048] like Figure 7As shown, in some embodiments of the present invention, the limiting frame 300 includes a mounting portion 310 and a limiting portion 320; the mounting portion 310 is provided in a plate-like, annular shape, and the mounting portion 310 is fixedly connected or detachably connected to the stator assembly 100. For example, the fixed connection can be achieved by welding or riveting, and the detachable connection can be achieved by screw connection; there are multiple limiting portions 320, which are arranged corresponding to the number of teeth 110. The multiple limiting portions 320 are all arranged on one side of the mounting portion 310. The multiple limiting portions 320 and the mounting portion 310 form an installation space similar to a groove. The stator assembly 100 is located in this installation space. The limiting portion 320 cooperates with the outer end surface of the winding 200 to prevent the winding 200 from slipping off the tooth 110. The embodiment of the limiting frame 300 described above has a simple structure and is stable and reliable in limiting the winding 200.

[0049] like Figure 7 and Figure 8 As shown, specifically, in some embodiments of the present invention, each limiting portion 320 includes two parallel fork rods 330, and the spacing between the two fork rods 330 is adapted to the width of the tooth portion 110, so that the fork rod 330 can accommodate the tooth portion 110, and the fork rod 330 abuts against the outer end surface of the winding 200, so that the limiting portion 320 can have two points acting on the winding 200 to stably limit the winding 200.

[0050] In addition, in certain embodiments of the present invention, a connecting rod 340 can be provided between the two fork rods 330. The connecting rod 340 is arranged perpendicular to the fork rod 330. At this time, the connecting rod 340 abuts against the outer end surface of the winding 200. The connecting rod 340 can also limit the winding 200, that is, the limiting portion 320 can have three points acting on the winding 200, further improving the stability of limiting the winding 200.

[0051] It should be noted that the implementation of the limiting portion 320 is not limited to the above-mentioned embodiment, and other implementations may also be adopted. For example, each limiting portion 320 may include only one fork rod 330, and the winding 200 is limited by a single fork rod 330; or each limiting portion 320 includes two non-parallel fork rods 330, and so on.

[0052] like Figures 1 to 5 As shown, in some embodiments of the present invention, a stator bracket 130 is fixedly mounted within the yoke 120, and a retaining bracket 300 is detachably connected to the stator bracket 130. The stator bracket 130 and the yoke 120 can be fixed together by an interference fit, welding, screws, or other methods. The stator bracket 130 fills the space within the yoke 120, thereby increasing the structural strength of the stator assembly 100. Furthermore, the stator bracket 130 can be used to connect to other structures.

[0053] In addition, it should be noted that the stator bracket 130 can be configured in a plate shape, with some through holes opened on the stator bracket 130 to reduce weight; the stator bracket 130 can also be configured in a spoke shape, etc.

[0054] Specifically, in addition to being connected to the stator assembly 100, in some embodiments of the present invention, the limit frame 300 can also be installed on the stator bracket 130 through a snap-fit ​​structure; the snap-fit ​​structure includes a snap hole set on the limit frame 300 and a snap hook set on the stator bracket 130; the snap hole passes through the limit frame 300, and the snap hook is protruded on the side wall of the stator bracket 130 close to the limit frame 300.

[0055] Of course, those skilled in the art will appreciate that the limiting frame 300 and the stator bracket 130 may be connected in other ways, for example, by screws, etc.

[0056] like Figure 1 As shown, in some embodiments of the present invention, the winding 200 has an outlet head 210, which passes through the mounting portion 310, and a bridge connection line 400 is provided on the other side of the mounting portion 310. The bridge connection line 400 is electrically connected to the outlet head 210, and the winding 200 is connected through the bridge connection line 400; wherein, the mounting portion 310 is provided with a clamping position, and the bridge connection line 400 is preliminarily positioned through these clamping positions, and then the bridge connection line 400 and the outlet head 210 can be connected and fixed by welding, or the bridge connection line 400 and the outlet head 210 can be fixed by knotting, and so on.

[0057] Specifically, the bridge connecting wire 400 and the winding 200 can be wound with aluminum enameled wire. The use of aluminum wire in the winding 200 improves the market competitiveness of the product while ensuring the performance requirements of the motor. The bridge connecting wire 400 is made of aluminum wire, which is conducive to welding and connecting with the winding 200 outlet end 210.

[0058] The above-mentioned limiting frame can be used to radially limit the winding 200 to prevent the winding 200 from slipping off the tooth portion 110, and can also be used to install the bridge connecting wire 400. The structural design is reasonable, compact and practical, and can effectively reduce the volume of the stator assembly.

[0059] Of course, in some application scenarios that have high performance requirements and are not sensitive to cost, the winding 200 can also be made of copper enameled wire to improve the conductive performance.

[0060] In some embodiments of the present invention, the conductor used in winding 200 has a cross-section that is rectangular, oval, or round. This reduces the gaps between the conductors after winding, compared to conventional round conductors, thereby improving the slot fill factor. After the conductors are wound using external tooling and then assembled onto the teeth 110, the slot fill factor can reach approximately 75%, a significant improvement over the 55% slot fill factor in conventional structures. This improves the power density and performance of the motor without increasing its size.

[0061] In some embodiments of the present invention, a copper-aluminum transition terminal is provided on the other side of the mounting portion 310. The copper-aluminum transition terminal is a copper-aluminum transition terminal used for power transmission connection, including an aluminum substrate, a copper sheet layer is provided on the lower half of the substrate surface, and the copper sheet layer and the corresponding substrate surface portion are tightly fused and connected to form an integrated solder-free structure; the aluminum substrate is welded or knotted to the bridge connection line 400, and the copper sheet layer is connected to the electronic control board, which can solve the problem that copper and aluminum cannot be welded or are poorly welded.

[0062] The assembly process of some embodiments of the present invention is as follows: the silicon steel sheets are punched out according to the design, and the punched silicon steel sheets are processed into a wound stator assembly 100, and then the stator assembly 100 is fixedly connected to the stator bracket 130 through an interference fit method to form an assembly; the winding 200 is wound externally using a tool, and the shape of the tool corresponds to the shape of the tooth portion 110. After the winding 200 is wound, the winding 200 is assembled to the tooth portion 110 of the stator assembly, and then the limit frame 300 is buckled on the stator assembly. At this time, the fork rod 330 is in contact with the outer end face of the winding 200, and the bridge connecting wire 400 is connected to the outlet head 210. The bridge connecting wire 400 is welded to the outlet head 210 and then the bridge connecting wire 400 is welded to the copper-aluminum transition terminal to complete the assembly of the stator assembly.

[0063] According to an embodiment of the second aspect of the present invention, a hub motor includes the stator assembly of the embodiment of the first aspect, the stator assembly and the rotor assembly are assembled to form a motor, and the rotor assembly and the hub are an integrated structure. The stator assembly 100 is generally cut from silicon steel sheets, and the cut silicon steel sheets are processed into a wound stator assembly 100. In order to improve the utilization rate of the silicon steel sheets, it is necessary to design the splicing and cutting method in advance during cutting. If the tooth portion 110 is provided with a tooth boot, when cutting the silicon steel sheets, the splicing and cutting method must be designed based on the tooth boot. However, no matter how it is optimized, in the case of the tooth boot, the material utilization rate of the silicon steel sheet can only reach 70% at most, and it is difficult to further improve it. Since the stator assembly of this embodiment does not have tooth boots, there is no need to consider the tooth boot factor when designing the splicing and cutting method. This can further optimize the splicing and cutting method, thereby improving the material utilization rate of the silicon steel sheet. At the same time, the tooth portion 110 without tooth boots is conducive to the winding 200 being wound on the external tooling and then radially inserted into the tooth portion 110. If there are tooth boots, the width of the tooth boots must be greater than the width of the tooth portion 110. The winding 200 wound externally cannot be inserted into the tooth portion 110 and the winding 200 will be blocked by the tooth boots. Due to the lack of tooth boots to position the winding 200, there is a risk that the winding 200 will slip out of the tooth portion 110. The limit frame 300 can effectively prevent the winding 200 from slipping off the tooth portion 110, ensuring stable and reliable product performance.

[0064] According to an embodiment of the third aspect of the present invention, an electric vehicle includes a hub motor according to the embodiment of the third aspect. The stator assembly 100 is generally cut from silicon steel sheets, and the cut silicon steel sheets are processed into a wound stator assembly 100. In order to improve the utilization rate of the silicon steel sheets, the splicing and cutting method needs to be designed in advance during cutting. If the tooth portion 110 is provided with a tooth shoe, when cutting the silicon steel sheets, the splicing and cutting method must be designed based on the tooth shoe. However, no matter how it is optimized, in the case of the tooth shoe, the material utilization rate of the silicon steel sheet can only reach 70% at most, and it is difficult to further improve it. Since the stator assembly of this embodiment does not have tooth boots, there is no need to consider the tooth boot factor when designing the splicing and cutting method. This can further optimize the splicing and cutting method, thereby improving the material utilization rate of the silicon steel sheet. At the same time, the tooth portion 110 without tooth boots is conducive to the winding 200 being wound on the external tooling and then radially inserted into the tooth portion 110. If there are tooth boots, the width of the tooth boots must be greater than the width of the tooth portion 110. The winding 200 wound externally cannot be inserted into the tooth portion 110 and the winding 200 will be blocked by the tooth boots. Due to the lack of tooth boots to position the winding 200, there is a risk that the winding 200 will slip out of the tooth portion 110. The limit frame 300 can effectively prevent the winding 200 from slipping off the tooth portion 110, ensuring stable and reliable product performance.

Claims

1. A stator assembly, characterized in that: include: The stator assembly includes a tooth portion without tooth shoes and a yoke portion having a certain thickness and forming a closed portion, wherein a plurality of the tooth portions are distributed on the outer periphery of the yoke portion; a winding, disposed on the tooth portion; A limiting frame is connected to the stator assembly, and the limiting frame is used to limit the radial position of the winding relative to the tooth portion. The limiting frame includes a mounting portion and multiple limiting portions. The mounting portion is connected to the stator assembly, and multiple limiting portions are arranged on one side of the mounting portion. Multiple limiting portions are arranged corresponding to multiple tooth portions. Multiple limiting portions and the mounting portion form an installation space similar to a groove. The stator assembly and the winding are located in this installation space. The mounting portion is located above the winding and the projection of the mounting portion in the horizontal direction partially overlaps with the projection of the winding in the horizontal direction. A part of the limiting portion is located above the winding, and the projection of the limiting portion in the horizontal direction partially overlaps with the projection of the winding in the horizontal direction. A part of the limiting portion extends axially toward the tooth portion and cooperates with the outer end surface of the winding.

2. The stator assembly according to claim 1, characterized in that: Two opposite side walls of the tooth portion are arranged in parallel.

3. The stator assembly according to claim 2, characterized in that: The tooth width of the tooth portion is L1, and along the circumference of the yoke portion, the distance between the tooth roots of adjacent tooth portions is L2, satisfying the following: 1mm≤(L2-L1)≤3mm.

4. The stator assembly according to claim 1, characterized in that: The limiting portion includes two fork rods, the distance between the two fork rods is adapted to the width of the tooth portion, and the fork rods abut against the outer end surface of the winding.

5. The stator assembly according to claim 4, characterized in that: A connecting rod is provided between the two fork rods, the connecting rod and the fork rod are arranged perpendicularly, and the connecting rod abuts against the outer end surface of the winding.

6. The stator assembly according to claim 1, characterized in that: The winding has an outlet head, and a bridge connection line is provided on the other side of the mounting portion, and the bridge connection line is electrically connected to the outlet head.

7. The stator assembly according to claim 1, characterized in that: A copper-aluminum transition terminal is provided on the other side of the mounting portion.

8. The stator assembly according to claim 1, characterized in that: A stator bracket is fixedly installed in the yoke, and the limiting frame is detachably connected to the stator bracket.

9. The stator assembly according to claim 8, characterized in that: The limiting frame is mounted on the stator bracket via a snap-fit ​​structure or screws.

10. The stator assembly according to claim 1, characterized in that: The cross section of the wire used in the winding is rectangular, oval or one of more than one shape.

11. The stator assembly according to any one of claims 1 to 10, characterized in that: The winding adopts aluminum enameled wire.

12. A hub motor, characterized in that: Comprising the stator assembly according to any one of claims 1 to 11.

13. An electric vehicle, characterized in that: Including the hub motor according to claim 12.

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