Motor and limit structure thereof

Abstract

The application relates to a motor and a limiting structure thereof, and the limiting structure comprises: a first limiting piece and a second limiting piece, the first limiting piece is arranged on one side of a plurality of coils in a second direction, the second limiting piece is arranged on the other side of the plurality of coils in the second direction, and the first limiting piece and the second limiting piece jointly limit the relative movement of the plurality of coils in the second direction, and the second direction is perpendicular to the first direction. Therefore, the first limiting piece and the second limiting piece can clamp the plurality of coils in the second direction, the coils are limited in the second direction, the displacement of the coils in subsequent manufacturing and use is prevented, and in the pouring process, the coils can be prevented from floating up and down with the liquid pouring material, the coils can be prevented from moving up and down to cause the air gap surface between the lower end of the tooth slot of the iron core and the magnet below the iron core to be uneven, and the use performance of the motor is improved.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a motor and its limiting structure. Background Technology

[0002] In existing technology, motors include coils and iron cores. The coils and iron cores cannot be fixed relatively in the vertical direction. During the coil wiring and mover potting process, due to the lack of a limiting mechanism, the coil position can easily change during the coil wiring process. Since the mover potting material is initially liquid, the coil can easily float up and down during the potting process, resulting in uneven air gap surfaces between the mover and stator of the linear motor. This causes poor fit between the mover and stator of the linear motor and will seriously affect the performance of the motor. Summary of the Invention

[0003] This application provides a motor and its limiting structure to solve the problem that the position of the coil in the second direction cannot be relatively fixed.

[0004] Firstly, this application provides a limiting structure for an electric motor.

[0005] Secondly, this application provides an electric motor, which includes the aforementioned limiting structure.

[0006] This application provides a limiting structure for a motor. The motor includes an iron core and a plurality of coils arranged sequentially along a first direction. Each coil has an inner hole. The limiting structure includes: a first limiting member disposed on one side of the plurality of coils along a second direction; and a second limiting member disposed on the other side of the plurality of coils along the second direction. The first limiting member and the second limiting member together restrict the relative movement of the plurality of coils in the second direction, which is perpendicular to the first direction.

[0007] The technical solutions provided in this application have the following advantages compared with the prior art:

[0008] The limiting structure provided in this application embodiment, by setting a first limiting member and a second limiting member, can clamp multiple coils in a second direction to limit the coils in the second direction, thereby preventing the coils from shifting during subsequent manufacturing and use. Furthermore, it can prevent the coils from floating up and down with the liquid potting material during the potting process. It also prevents unevenness of the air gap surface between the lower end of the iron core's tooth groove and the magnet below the iron core caused by the coil's vertical movement, improving the motor's performance and facilitating the miniaturization design of the motor.

[0009] In some embodiments, the first limiting member includes: a first main body portion extending along the first direction and located on one side of the coil along the second direction; a plurality of plug-in portions connected to the side of the first main body portion facing the coil, the plurality of plug-in portions being disposed in one-to-one correspondence with the plurality of coils, and the plug-in portions engaging with the inner hole.

[0010] In some embodiments, the two sides of the plug portion abut against the coil along the first direction.

[0011] In some embodiments, the core has a plurality of teeth spaced apart along the first direction, the teeth being inserted into the inner hole, and in a third direction, the insertion portion is located between the teeth and the coil, the third direction being perpendicular to both the first direction and the second direction.

[0012] In some embodiments, in the third direction from the coil to the tooth, the width of the insertion portion gradually increases in the first direction.

[0013] In some embodiments, in the first direction, the maximum width of the tooth is T1, the maximum width of the insertion part is T2, and the minimum width of the insertion part is T3, wherein T1, T2, and T3 satisfy: T1-T2≤1.5mm; and / or, T2-T3≥3mm.

[0014] In some embodiments, a first insulating layer is provided between the teeth and the wall of the inner hole; and / or, a second insulating layer is provided between two adjacent coils.

[0015] In some embodiments, the first limiting member is two members spaced apart along a third direction, and the limiting structure further includes a first connecting strip and a second connecting strip spaced apart along the first direction; the first connecting strip connects the two first limiting members on one side of the first limiting member, and the second connecting strip connects the two first limiting members on the other side of the first limiting member.

[0016] In some embodiments, at least one of the first connecting strip and the second connecting strip is detachably connected to the first limiting member.

[0017] In some embodiments, the iron core has a mounting groove on one side along the first direction, the opening of the mounting groove is open along the first direction, and the side of the first connecting strip facing the iron core has a protrusion, the protrusion being embedded in the mounting groove.

[0018] In some embodiments, the second limiting member includes: a second body portion extending along the first direction and located on the other side of the coil along the second direction; and an extension segment connected to the side of the second body portion facing the first limiting member and extending toward the first limiting member, the extension segment being detachably connected to the first limiting member.

[0019] In some embodiments, the thickness of the second main body portion in the second direction is equal to the thickness of the air gap surface of the iron core in the second direction.

[0020] In some embodiments, at least one of the first limiting member and the second limiting member is an insulating member.

[0021] This application also proposes a motor including the aforementioned limiting structure. By providing a first limiting member and a second limiting member, the first limiting member and the second limiting member can clamp multiple coils in a second direction to limit the coils in the second direction, thereby preventing the coils from shifting during subsequent manufacturing and use. Furthermore, during the potting process, it can prevent the coils from floating up and down with the liquid potting material. It can also prevent the coils from shifting up and down, thus preventing unevenness in the air gap between the lower end of the tooth groove of the iron core and the magnet below the iron core, improving the motor's performance and facilitating miniaturization design. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0025] Figure 1 This is a perspective view of an electric motor provided in an embodiment of this application.

[0026] Figure 2 This is a side view of an iron core provided in an embodiment of this application.

[0027] Figure 3A perspective view of an iron core and coil provided for an embodiment of this application.

[0028] Figure 4 This is a perspective view of a limiting structure provided in an embodiment of this application.

[0029] Figure 5 An exploded view of a limiting structure provided in an embodiment of this application.

[0030] Figure 6 A cross-sectional view of an iron core and coil provided for an embodiment of this application.

[0031] Figure 7 An exploded view of an electric motor provided in an embodiment of this application.

[0032] Figure 8 Another perspective view of an electric motor provided in an embodiment of this application.

[0033] Figure 9 This is a cross-sectional view of a portion of the structure of an electric motor provided in an embodiment of this application.

[0034] Figure 10 An exploded view of a first limiting member and an iron core provided for an embodiment of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100. Limiting structure; 200. Iron core; 210. Toothed part; 220. Mounting slot;

[0037] 300. Coil; 310. Inner hole; A. First direction; B. Second direction; C. Third direction;

[0038] 10. First limiting member; 11. First main body; 12. Insertion part;

[0039] 20. Second limiting member; 21. Second main body; 22. Extension section;

[0040] 30. First connecting strip; 31. Protrusion; 40. Second connecting strip;

[0041] 50. Magnet; 60. Air gap surface. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0044] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0045] To address the technical problem that the position of the coil in the second direction cannot be relatively fixed in the prior art, this application provides a limiting structure 100 for a motor, which can limit the movement of the coil 300 in the second direction B to prevent unevenness of the air gap surface 60 and improve motor performance.

[0046] This application proposes a limiting structure 100 for a motor. The motor is a linear motor, which can be a 20000N thrust linear motor. The motor includes an iron core 200 and a plurality of coils 300 arranged sequentially along a first direction A.

[0047] Specifically, such as Figures 1-10As shown, the limiting structure 100 includes a first limiting member 10 and a second limiting member 20. The first limiting member 10 is located on one side of the coil 300 along the second direction B, and the second limiting member 20 is located on the other side of the plurality of coils 300 along the second direction B. The first limiting member 10 and the second limiting member 20 together restrict the relative movement of the plurality of coils 300 in the second direction B. The first direction A is the direction of motor movement, and the second direction B is perpendicular to the first direction A. The second direction B is the vertical direction. For example, the first limiting member 10 is located on the upper side of the coil 300 along the second direction B, and the second limiting member 20 is located on the lower side of the plurality of coils 300 along the second direction B.

[0048] like Figure 4 As shown, the first limiting member 10 and the second limiting member 20 can extend along the first direction A. The two ends of the first limiting member 10 are respectively located outside the plurality of coils 300 in the first direction A. Thus, the first limiting member 10 and the second limiting member 20 can jointly clamp the plurality of coils 300 in the second direction B, thereby restricting the coils 300 and preventing displacement of the coils 300 in the second direction B. Furthermore, this arrangement reduces the force exerted on each coil 300 in the second direction B, preventing damage to the coils 300 and improving their service life.

[0049] Therefore, by setting the first limiting member 10 and the second limiting member 20, multiple coils 300 can be clamped in the second direction B, limiting the coils 300 in the second direction B to prevent displacement of the coils 300 during subsequent manufacturing and use. Furthermore, during the potting process, the coils 300 can be prevented from floating up and down with the liquid potting material. This prevents the coils 300 from moving up and down, thus preventing unevenness of the air gap surface 60 between the lower end of the tooth groove of the iron core 200 and the magnet 50 below the iron core 200, improving the performance of the motor and facilitating its miniaturization design.

[0050] In some embodiments, such as Figure 4 As shown, the first limiting member 10 includes a first main body 11 and a plurality of insertion portions 12. The first main body 11 extends along a first direction A and is located on one side of the coil 300 along a second direction B. The plurality of insertion portions 12 are connected to the side of the first main body 11 facing the coil 300, and the plurality of insertion portions 12 are arranged one-to-one with the plurality of coils 300. The insertion portions 12 are inserted into the inner hole 310. That is, the insertion portions 12 are inserted into the inner hole 310.

[0051] Thus, the first main body 11 can cooperate with the second limiting member 20 to restrict the movement of the plurality of coils 300 in the second direction B, and the plurality of plug-in parts 12 can be provided one-to-one with the plurality of coils 300 to facilitate the positioning and installation of the first limiting member 10 and the plurality of coils 300.

[0052] Furthermore, the two sides of the plug portion 12 along the first direction A abut against the coil 300. That is, the plug portion 12 can abut against the coil 300 inside the inner hole 310 of the coil 300 to restrict the movement of the coil 300 in the first direction A. For example, the plug portion 12 can be a cylinder.

[0053] In existing technologies, especially in frameless coil motors, the coils easily come into direct contact with the iron core, resulting in excessively short creepage distances. This can lead to poor insulation and affect motor performance. Furthermore, it is impossible to restrict the movement of the coils in the first direction A. If a limiting structure is used on the outside of the coils, the gap between the two coils will increase, causing coil deformation and failure of the fixing mechanism, thus affecting motor performance.

[0054] By setting the plug-in part 12 to abut against the coil 300 in the first direction A, on the one hand, it facilitates the separation of the iron core 200 and the coil 300 in the first direction A, ensuring the motor's performance; on the other hand, it restricts the movement of the coil 300 in the second direction B and the first direction A. The reasonable use of the inner hole 310 of the coil 300 avoids additional space occupation, thereby improving the slot fill factor of the coil 300. Furthermore, since both the teeth 210 of the iron core 200 and the plug-in part 12 are located within the inner hole 310, deformation of the coil 300 is less likely, ensuring the limiting effect and improving motor performance. In addition, it prevents the coil 300 from moving in the second direction B, ensuring the flatness of the air gap surface 60 of the motor and improving the motor's performance and stability.

[0055] In some embodiments, such as Figure 2 and Figure 7 As shown, the iron core 200 has a plurality of teeth 210 spaced apart along a first direction A. The teeth 210 are inserted into the inner holes 310, and the plurality of teeth 210 can be correspondingly inserted into the inner holes 310 of a plurality of coils 300. In a third direction C, the insertion part 12 is located between the teeth 210 and the coils 300. The third direction C is perpendicular to both the first direction A and the second direction B. Thus, the distance between the teeth 210 and the ends of the coils 300 in the third direction C can be utilized reasonably without occupying additional space. The teeth 210 and the coils 300 can be spaced apart in the third direction C to improve the insulation between the two ends of the coils 300 and the iron core 200, thereby improving the performance of the motor.

[0056] In some embodiments, refer to Figure 5 and combined Figure 9In the direction from coil 300 to tooth 210 in the third direction C, the width of the insertion portion 12 gradually increases in the first direction A. For example, the cross-section of the insertion portion 12 can be trapezoidal. With this arrangement, the shape of the inner hole 310 of coil 300 can be reasonably utilized, and the outer contour of the insertion portion 12 can be set to match the inner contour of the inner hole 310, thereby improving the stability of restricting the movement of coil 300 in the first direction A.

[0057] In some embodiments, such as Figure 9 As shown, in the first direction A, the maximum width of the tooth 210 is T1, the maximum width of the insertion part 12 is T2, and the minimum width of the insertion part 12 is T3. T1, T2, and T3 satisfy: T1-T2≤1.5mm; and / or, T2-T3≥3mm. For example, the minimum width of the insertion part 12 is the outermost width in the third direction C, and the maximum width of the insertion part 12 is the innermost width in the third direction C. The difference between T1 and T2 can be 1.5mm, 1mm, or 0.5mm. The difference between T2 and T3 can be 3mm, 2.5mm, or 2mm. In the first direction A, the maximum width T1 of the tooth 210 can be equal to the maximum width T2 of the insertion part 12, or the maximum width T1 of the tooth 210 can be slightly larger than the maximum width T2 of the insertion part 12. In this way, the stability of the insertion part 12 in restricting the movement of the coil 300 in the first direction A and the second direction B can be taken into account, and the slot fill factor of the motor can be guaranteed.

[0058] In some embodiments, a first insulating layer is provided between the tooth 210 and the wall of the inner hole 310; and / or, a second insulating layer is provided between two adjacent coils 300. For example, the first and second insulating layers can be insulating slot paper to improve the slot fill factor of the coil 300. The first insulating layer is provided between the tooth 210 and the wall of the inner hole 310, so that the inner hole 310 is insulated from the tooth 210. For example, the first insulating layer can be provided between the tooth 210 and the inner wall of the inner hole 310 in the first direction A, but is not limited thereto. The second insulating layer is provided between two adjacent coils 300 to separate the two adjacent coils 300 to achieve insulation capability.

[0059] In some embodiments, such as Figure 7As shown, there are two first limiting members 10 spaced apart along a third direction C. The limiting structure 100 also includes a first connecting strip 30 and a second connecting strip 40 spaced apart along a first direction A. The first connecting strip 30 connects the two first limiting members 10 to one side of the first limiting member 10, and the second connecting strip 40 connects the two first limiting members 10 to the other side of the first limiting member 10. By setting the first connecting strip 30 and the second connecting strip 40, the first limiting members 10 and the second limiting members 20 can be restricted, preventing them from shifting, thereby improving the limiting effect on the coil 300. Furthermore, the limiting structure 100 can be formed into a frame, further improving the reliability of the limiting effect on the coil 300.

[0060] For example, the first connecting strip 30 and the second connecting strip 40 can be symmetrical structures, and the cross-sections of the first connecting strip 30 and the second connecting strip 40 can be square or circular, without limitation.

[0061] In some embodiments, at least one of the first connecting strip 30 and the second connecting strip 40 is detachably connected to the first limiting member 10, thereby facilitating assembly and disassembly. For example, both the first connecting strip 30 and the second connecting strip 40 can be detachably connected to the first limiting member 10.

[0062] In some embodiments, such as Figure 7 As shown, the iron core 200 has a mounting groove 220 on one side along the first direction A. The opening of the mounting groove 220 is open towards the first direction A. The first connecting strip 30 has a protrusion 31 on the side facing the iron core 200, and the protrusion 31 is embedded in the mounting groove 220. Therefore, by providing the mounting groove 220, positioning can be facilitated, the position of the limiting structure 100 can be determined, thereby improving installation accuracy. Simultaneously, the structural stability of the limiting structure 100 can be improved, thereby enhancing the reliability of limiting multiple coils 300. Furthermore, it can prevent reverse installation, serving as a foolproof mechanism.

[0063] In some embodiments, such as Figure 7 As shown, the second limiting member 20 includes a second main body 21 and an extension 22. The second main body 21 extends along a first direction A and is located on the other side of the coil 300 along a second direction B. The extension 22 is connected to the side of the second main body 21 facing the first limiting member 10 and extends toward the first limiting member 10. The extension 22 is detachably connected to the first limiting member 10.

[0064] For example, the extension section 22 can be disposed at both ends of the second main body 21 in the first direction A. After installation, the extension section 22 is located outside the plurality of coils 300 in the first direction A and can be connected to the first limiting member 10 in the second direction B. By providing the extension section 22, positioning can be facilitated, and connection with the first limiting member 10 can be facilitated without interfering with the coils 300 and the iron core 200. In addition, the extension section 22 is detachably connected to the first limiting member 10, which facilitates disassembly and assembly, and can be detachably connected by screws. For example, the second limiting member 20 is located below the plurality of coils 300, and the first limiting member 10 is located above the plurality of coils 300. The dimension of the second limiting member 20 below the coils 300 in the second direction B is smaller than the dimension of the first limiting member 10 in the second direction B, to prevent interference with the air gap surface 60 and ensure the performance of the motor.

[0065] In some embodiments, the thickness of the second main body portion 21 in the second direction B is equal to the thickness of the air gap surface 60 of the iron core 200 in the second direction B, so as to ensure the flatness of the air gap surface 60 after the motor injection molding is completed. It is understood that the distance between the plurality of teeth 210 of the iron core 200 and the magnet 50 below is formed as the air gap surface 60.

[0066] In some embodiments, at least one of the first limiting member 10 and the second limiting member 20 is an insulating member. Both the first limiting member 10 and the second limiting member 20 can be insulating members, thereby improving the insulation capability of the motor.

[0067] For example, at least one of the first limiting member 10 and the second limiting member 20 can be a high-temperature insulating material. The first limiting member 10 and the second limiting member 20 can be made of polyether ether copper or polytetrafluoroethylene. In this way, the first limiting member 10 and the second limiting member 20 can not only play the role of limiting and fixing, but also conduct heat to the motor, improve the heat transfer performance of the motor, and thus improve the reliability and service life of the motor.

[0068] The installation process of the limiting structure 100 according to an embodiment of this application is described below with reference to the accompanying drawings. First, the first connecting strip 30 is connected to one of the first limiting members 10 by fasteners, and correspondingly, the first connecting strip 30 is connected to the other first limiting member 10 by fasteners. Then, the above installation process is repeated to install the second connecting strip 40.

[0069] The assembled structure is inserted from the air gap surface 60 into the gap between the two ends of the coil 300 along the third direction C and the iron core 200, so that the insertion part 12 is located between the iron core 200 and the coil 300 in the third direction C, and the insertion parts 12 of the two first limiting members 10, the teeth 210 of the coil 300 and the iron core 200 are all correspondingly arranged. Then, the insulating groove paper is inserted from the air gap surface 60 into the gap between the coil 300 and the teeth 210 in the first direction A. Then, the two corresponding first limiting members 10 and second limiting members 20 are installed and connected to each other.

[0070] This application provides an embodiment of a motor, which includes the aforementioned motor limiting structure 100, iron core 200, and multiple coils 300. By providing a first limiting member 10 and a second limiting member 20, the motor can clamp the multiple coils 300 in a second direction B, thereby limiting the coils 300 in the second direction B to prevent displacement of the coils 300 during subsequent manufacturing and use. Furthermore, during the potting process, it can prevent the coils 300 from floating up and down with the liquid potting material. This prevents the coils 300 from moving up and down, thus preventing unevenness of the air gap surface 60 between the lower end of the tooth groove of the iron core 200 and the magnet 50 below the iron core 200, improving the motor's performance and facilitating miniaturization design.

[0071] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0072] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0073] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A limiting structure for an electric motor, the motor comprising an iron core and a plurality of coils arranged sequentially along a first direction, each coil having an inner hole, characterized in that, The limiting structure includes: A first limiting member is disposed on one side of the plurality of coils along the second direction. The first limiting member includes a first main body and a plurality of plug-in portions. The first main body extends along the first direction and is located on one side of the coils along the second direction. The plurality of plug-in portions are connected to the side of the first main body facing the coils. The plurality of plug-in portions are arranged in a one-to-one correspondence with the plurality of coils, and the plug-in portions are plugged into the inner hole. A second limiting member is disposed on the other side of the plurality of coils along the second direction. The first limiting member and the second limiting member together restrict the relative movement of the plurality of coils in the second direction, which is perpendicular to the first direction. The second limiting member includes a second main body and an extension. The second main body extends along the first direction and is located on the other side of the coils along the second direction. The extension is connected to the side of the second main body facing the first limiting member and extends toward the first limiting member. The extension is detachably connected to the first limiting member.

2. The limiting structure for the motor according to claim 1, characterized in that, The plug portion abuts against the coil on both sides along the first direction.

3. The motor limiting structure according to claim 1, characterized in that, The iron core has a plurality of teeth spaced apart along the first direction, and the teeth are inserted into the inner hole. In the third direction, the insertion portion is located between the tooth and the coil, and the third direction is perpendicular to both the first direction and the second direction.

4. The motor limiting structure according to claim 3, characterized in that, In the third direction from the coil to the tooth, the width of the insertion portion gradually increases in the first direction.

5. The motor limiting structure according to claim 3, characterized in that, In the first direction, the maximum width of the tooth is T1, the maximum width of the insertion part is T2, and the minimum width of the insertion part is T3, wherein T1, T2, and T3 satisfy: T1 - T2 ≤ 1.5 mm; and / or, T2 - T3 ≥ 3 mm.

6. The motor limiting structure according to claim 3, characterized in that, A first insulating layer is provided between the teeth and the wall of the inner hole; and / or, a second insulating layer is provided between two adjacent coils.

7. The limiting structure for the motor according to claim 1, characterized in that, The first limiting member consists of two pieces spaced apart along a third direction, and the limiting structure further includes a first connecting strip and a second connecting strip spaced apart along the first direction; The first connecting strip connects two of the first limiting members on one side of the first limiting member, and the second connecting strip connects two of the first limiting members on the other side of the first limiting member.

8. The motor limiting structure according to claim 7, characterized in that, At least one of the first connecting strip and the second connecting strip is detachably connected to the first limiting member.

9. The limiting structure of the motor according to claim 7, characterized in that, The iron core has a mounting groove on one side along the first direction, the opening of the mounting groove is open towards the first direction, and the first connecting strip has a protrusion on the side facing the iron core, the protrusion being embedded in the mounting groove.

10. The limiting structure of the motor according to claim 1, characterized in that, The thickness of the second main body in the second direction is equal to the thickness of the air gap surface of the iron core in the second direction.

11. The limiting structure of the motor according to claim 1, characterized in that, At least one of the first limiting member and the second limiting member is an insulating member.

12. An electric motor, characterized in that, Includes the limiting structure according to any one of claims 1-11.

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