Motor

Abstract

The utility model relates to an electric machine. Comprising a rotor assembly; the stator assembly is sleeved outside the rotor assembly; the shell assembly comprises an outer shell and a top cover which are connected with each other, the outer shell is arranged around the stator assembly, the stator assembly is connected between the top cover and the outer shell in an abutting mode in the axial direction of the shell assembly, one of the outer shell and the stator assembly is provided with a limiting groove, and the other one comprises a limiting protrusion; and the limiting groove is matched with the limiting bulge so as to position the stator assembly along the radial direction and the circumferential direction of the shell assembly. Therefore, circumferential, axial and radial positioning of the stator assembly along the shell assembly is realized, circumferential, axial and radial displacement of the stator assembly relative to the shell assembly is avoided, and effective fixation of the stator assembly and the shell assembly is realized. Therefore, the connection strength between the stator assembly and the shell assembly is improved, the assembly precision of all parts of the motor is also improved, and finally the vibration noise caused by vibration of the motor is reduced.

Description

Technical Field

[0001] This application relates to the field of electric motor technology, and in particular to an electric motor. Background Technology

[0002] Electric motors have a wide range of applications. For example, they can be used in demanding applications such as magnetic levitation in industrial robots. Therefore, there are high requirements for motors in terms of fast response and quiet operation, i.e., high NVH (Noise, Vibration, Harshness) requirements. However, traditional motors often suffer from significant vibration and noise. Utility Model Content

[0003] One of the technical problems addressed by this application is how to reduce the vibration and noise of an electric motor.

[0004] An electric motor, comprising:

[0005] Rotor assembly;

[0006] Stator assembly, sleeved outside the rotor assembly; and

[0007] A housing assembly includes an interconnected outer shell and a top cover, the outer shell being disposed around the stator assembly along the axial direction of the housing assembly, the stator assembly abutting between the top cover and the outer shell, one of the outer shell and the stator assembly having a limiting groove and the other including a limiting protrusion, the limiting groove and the limiting protrusion cooperating to position the stator assembly radially and circumferentially along the housing assembly.

[0008] In one embodiment, the housing includes a housing body and a support protrusion. The support protrusion protrudes from the inner circumferential surface of the housing and has a support surface. A groove is recessed on the outer circumferential surface of the stator assembly. The inner wall of the groove includes an abutment surface that is angled to the axial direction of the housing assembly. The support surface and the abutment surface abut against each other along the axial direction of the housing assembly.

[0009] In one embodiment, the shell body forms a first cavity and a second cavity arranged coaxially, the diameter of the first cavity is larger than the diameter of the second cavity, the bottom wall surface of the first cavity includes a stepped surface surrounding the second cavity, the stator assembly is housed in the second cavity, and the top cover is housed in the first cavity and abuts against the stepped surface.

[0010] In one embodiment, the stator assembly includes a positioning post along the axial direction of the housing assembly, the distance between the top cover and the support surface is H, and the distance between the end of the positioning post and the abutment surface is h, where H > h.

[0011] In one embodiment, the stator assembly includes a stator body and a positioning post, the positioning post protruding along the axial direction of the housing assembly onto the stator body, and the end of the positioning post abutting against the top cover along the axial direction of the housing assembly.

[0012] In one embodiment, the positioning post is made of an elastic material and is therefore elastic.

[0013] In one embodiment, the outer shell forms a receiving cavity, and the outer shell has a slot communicating with the receiving cavity. The top cover includes a cover portion and a mating portion. The mating portion protrudes from the edge of the cover portion. The cover portion is located inside the receiving cavity and abuts against the stator assembly. The mating portion is located outside the receiving cavity and engages with the slot.

[0014] In one embodiment, the housing includes a housing body and a bending body, the housing body forming the receiving cavity, the bending body being connected to the housing body and capable of bending relative to the housing body, and the bending body being capable of abutting against the side of the top cover away from the stator assembly along the axial direction of the housing assembly.

[0015] In one embodiment, the outer shell includes a shell body and the limiting protrusion, the limiting protrusion protruding from the inner wall surface of the shell body, the width of the limiting protrusion decreasing along the protruding direction of the limiting protrusion relative to the shell body; the width of the limiting groove decreasing along the concave direction of the limiting groove.

[0016] In one embodiment, a set distance is maintained between the top of the limiting protrusion and the bottom of the limiting groove.

[0017] One technical advantage of one embodiment of this application is that, since the stator assembly abuts between the top cover and the outer shell, the limiting groove and the limiting protrusion cooperate to position the stator assembly radially and circumferentially along the shell assembly. This achieves circumferential, axial, and radial positioning of the stator assembly along the shell assembly, preventing circumferential, axial, and radial displacement of the stator assembly relative to the shell assembly, thereby effectively fixing the stator assembly to the shell assembly. This improves the connection strength between the stator assembly and the shell assembly, enhances the assembly precision between various motor components, and ultimately reduces vibration noise caused by motor vibration. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a motor provided in one embodiment.

[0019] Figure 2 for Figure 1 The diagram shows the first example exploded structure of the motor.

[0020] Figure 3for Figure 1 The diagram shows a three-dimensional cross-sectional view of the outer casing of the motor.

[0021] Figure 4 for Figure 1 The second example exploded structure diagram of the motor shown.

[0022] Figure 5 for Figure 1 The diagram shows the cross-sectional structure of the motor.

[0023] Figure 6 for Figure 1 The diagram shows the three-dimensional structure of the motor after the outer casing has been removed.

[0024] Figure 7 for Figure 1 The diagram shows a three-dimensional sectional view of the motor.

[0025] Reference numerals: Motor 10, Rotor assembly 100, Stator assembly 200, Stator body 210, Positioning post 220, Limiting groove 230, Groove 240, Abutment surface 250, Shell assembly 300, Shell 310, Shell body 311, Receiving cavity 3111, First cavity 3111a, Second cavity 3111b, Step surface 3111c, Slot 3112, Limiting protrusion 312, Supporting protrusion 313, Supporting surface 3131, Bending body 314, Top cover 320, Cover part 321, Mating part 322. Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0032] See Figure 1 , Figure 2 , Figure 3 and Figure 4An embodiment of this application provides a motor 10 including a rotor assembly 100, a stator assembly 200, and a housing assembly 300. The stator assembly 200 is sleeved outside the rotor assembly 100, so the motor 10 can be understood as an internal rotor motor. The housing assembly 300 includes a housing 310 and a top cover 320, which are connected to each other. The housing 310 is arranged around the stator assembly 200. Along the axial direction of the housing assembly 300, the stator assembly 200 abuts between the top cover 320 and the housing 310. One of the housing 310 and the stator assembly 200 has a limiting groove 230 and the other includes a limiting protrusion 312. The limiting groove 230 and the limiting protrusion 312 cooperate to position the stator assembly 200 along the radial and circumferential directions of the housing assembly 300.

[0033] See Figure 3 , Figure 4 and Figure 5 In some embodiments, the housing 310 may include a limiting protrusion 312. For example, the housing 310 includes a housing body 311 and a limiting protrusion 312. The housing body 311 forms a receiving cavity 3111, within which the stator assembly 200 can be received. The limiting protrusion 312 is located within the receiving cavity 3111, such that the limiting protrusion 312 can protrude radially from the inner wall of the housing body 311 and extend radially along the housing body 311 for a certain length. A limiting groove 230 is provided on the stator assembly 200 and can be formed by recessing a certain depth into the outer peripheral surface of the stator assembly 200. The limiting groove 230 also extends radially along the housing body 311 for a certain length and can penetrate two spaced-apart surfaces on the stator assembly 200. The number of limiting grooves 230 and limiting protrusions 312 can be equal and correspond one-to-one. The limiting grooves 230 and limiting protrusions 312 cooperate with each other. There can be two limiting grooves 230, and the two limiting grooves 230 can be spaced 180° apart along the axial direction of the stator assembly 200. When the stator assembly 200 is installed into the receiving cavity 3111 of the housing body 311, the limiting protrusions 312 will enter the limiting grooves 230 from one end until the limiting protrusions 312 and the limiting grooves 230 form a cooperating relationship. In other embodiments, the limiting protrusions 312 can be provided on the stator assembly 200, and the limiting grooves 230 can be provided on the housing body 311.

[0034] Through the cooperation of the limiting protrusion 312 and the limiting groove 230, on the one hand, the limiting protrusion 312 can abut against the inner wall surface of the limiting groove 230, so that the limiting protrusion 312 applies abutting force to the shell body 311 radially, thereby positioning the stator assembly 200 radially. On the other hand, the limiting protrusion 312 can abut against the inner wall surface of the limiting groove 230, so that the limiting protrusion 312 applies abutting force to the shell body 311 circumferentially, thereby positioning the stator assembly 200 circumferentially. Therefore, the cooperation of the limiting protrusion 312 and the limiting groove 230 can effectively limit the stator assembly 200 both circumferentially and radially.

[0035] In some embodiments, the width of the limiting protrusion 312 can be gradually reduced along the protruding direction of the limiting protrusion 312 relative to the shell body 311, thus making the limiting protrusion 312 approximately trapezoidal. Similarly, the width of the limiting groove 230 can be gradually reduced along the recessing direction of the limiting groove 230, thus also making the limiting groove 230 approximately trapezoidal. When the limiting protrusion 312 engages with the limiting groove 230, the two sidewalls of the limiting protrusion 312 and the limiting groove 230 abut against each other. The abutting force between the limiting protrusion 312 and the two sidewalls can be decomposed into two components along the radial and circumferential directions of the stator assembly 200, thereby achieving effective radial and circumferential positioning of the limiting protrusion 312 on the stator assembly 200. Furthermore, given that the limiting protrusion 312 is approximately trapezoidal, the engagement resistance between the limiting protrusion 312 and the limiting groove 230 can be reasonably reduced.

[0036] See Figure 5 In some embodiments, a set distance E is maintained between the top of the limiting protrusion 312 and the bottom of the limiting groove 230, meaning that the top of the limiting protrusion 312 does not contact the bottom wall of the limiting groove 230, resulting in a gap of a certain width between the top of the limiting protrusion 312 and the bottom of the limiting groove 230. This effectively avoids interference caused by the limiting protrusion contacting the bottom wall of the limiting groove 230, thereby improving the assembly accuracy and efficiency of the stator assembly 200.

[0037] See Figure 2 and Figure 3In some embodiments, the accommodating cavity 3111 includes a first cavity 3111a and a second cavity 3111b, which are coaxially arranged. The diameter of the first cavity 3111a is larger than that of the second cavity 3111b. The bottom wall surface of the first cavity 3111a includes a stepped surface 3111c, which surrounds the second cavity 3111b. The stator assembly 200 can be housed in the second cavity 3111b, and the top cover 320 can be housed in the first cavity 3111a. The top cover 320 abuts against the stepped surface 3111c. During assembly, the stepped surface 3111c supports the top cover 320, thus effectively limiting the top cover 320 along the axial direction of the housing body 311. It can be understood that the axial direction of the housing body 311 and the axial direction of the stator assembly 200 are both the axial direction of the motor 10, the circumferential direction of the housing body 311 and the circumferential direction of the stator assembly 200 are both the circumferential direction of the motor 10, and the radial direction of the housing body 311 and the radial direction of the stator assembly 200 are both the radial direction of the motor 10.

[0038] See Figure 1 , Figure 2 and Figure 3 In some embodiments, a slot 3112 is provided on the shell body 311. The slot 3112 extends axially along the shell body 311 to the end of the shell body 311 and penetrates the shell body 311 along the thickness direction, so that the slot 3112 connects the first cavity 3111a and the outside. The top cover 320 includes a cover portion 321 and a mating portion 322. The cover portion 321 is generally circular, and the mating portion 322 is actually a boss structure, so that the mating portion 322 protrudes from the edge of the cover portion 321, that is, the mating portion 322 protrudes from the cover portion 321 by a certain length along the radial direction of the cover portion 321. During installation, the cover portion 321 is located in the first cavity 3111a and abuts against the stepped surface 3111c, and the mating portion 322 is located outside the receiving cavity 3111 and cooperates with the slot 3112. Through the mutual cooperation of the mating part 322 and the slot 3112, the top cover 320 can be well positioned along the circumference of the outer shell 310, preventing the top cover 320 from rotating around the central axis of the shell body 311. Simultaneously, the edge of the cover part 321 abuts against the inner circumferential surface of the shell body 311, thus allowing the shell body 311 to effectively limit the top cover 320 radially. In other embodiments, the slot 3112 can be provided on the top cover 320, allowing the shell body 311 to cooperate with the slot 3112, similarly enabling circumferential positioning of the top cover 320.

[0039] See Figure 1 , Figure 2 and Figure 3In some embodiments, the outer casing 310 further includes a bending body 314 connected to the casing body 311. The bending body 314 can be bent at a certain angle relative to the casing body 311. In other words, when the bending body 314 bends relative to the casing body 311, the angle between the bending body 314 and the casing body 311 can be changed. For example, in the initial state, the bending body 314 can extend along the axial direction of the casing body 311. When the bending body 314 bends relative to the casing body 311, the angle between the bending body 314 and the axial direction of the casing body 311 changes. When the top cover 320 abuts against the stepped surface 3111c, the bent body 314 bends relative to the shell body 311, thereby housing the bent body 314 within the first cavity 3111a and perpendicular to the shell body 311. This allows the bent body 314 to abut against the side of the top cover 320 furthest from the stator assembly 200. Specifically, the stepped surface 3111c and the bent body 314 are located on opposite sides of the top cover 320 in the thickness direction, meaning the top cover 320 is sandwiched between the stepped surface 3111c and the bent body 314. This positioning of the top cover 320 along the axial direction of the shell assembly 300 prevents it from sliding relative to the shell assembly 300. Multiple bent bodies 314 can be evenly spaced along the circumference of the shell body 311.

[0040] See Figure 3 , Figure 6 and Figure 7 In some embodiments, the outer casing 310 further includes a support protrusion 313, which protrudes from the inner circumferential surface of the casing body 311, such that the support protrusion 313 is located in the second cavity 3111b. There can be multiple support protrusions 313, which are spaced apart circumferentially along the casing body 311. Each support protrusion 313 has a support surface 3131, which faces the top cover 320 and can be perpendicular to the axial direction of the outer casing 310. A groove 240 is recessed on the outer peripheral surface of the stator assembly 200. The bottom wall of the groove 240 includes an abutment surface 250. The abutment surface 250 is set at an angle to the axial direction of the housing assembly 300. For example, the abutment surface 250 and the axial direction of the housing assembly 300 can be set at a 90° angle, that is, the abutment surface 250 and the axial direction of the housing assembly 300 are perpendicular to each other. The abutment surface 250 can be set away from the top cover 320. During the installation of the stator assembly 200, the groove 240 can cooperate with the support protrusion 313, so that the support surface 3131 and the abutment surface 250 generate an abutment force along the axial direction of the housing assembly 300. That is, the support surface 3131 positions the stator assembly 200 along the axial direction of the housing assembly 300.

[0041] See Figure 3 , Figure 6 and Figure 7 In some embodiments, the stator assembly 200 includes a stator body 210 and positioning posts 220. The positioning posts 220 protrude axially from the stator body 210. Multiple positioning posts 220 are provided, spaced apart circumferentially from the stator body 210. The positioning posts 220 can be made of an elastic material, thus giving them a certain degree of elasticity and allowing them to undergo elastic deformation. During the assembly of the stator assembly 200, the end of the positioning post 220 away from the stator body 210 can abut against the top cover 320 along the axial direction of the stator assembly 200. Therefore, the entire stator assembly 200 is abutted between the top cover 320 and the support surface 3131 along the axial direction of the stator assembly 200, so that the top cover 320 and the support surface 3131 play a good positioning role for the stator assembly 200 along the axial direction of the stator assembly 200, and prevent the stator assembly 200 from moving relative to the housing assembly 300 along the axial direction of the stator assembly 200.

[0042] See Figure 3 , Figure 6 and Figure 7 In some embodiments, along the axial direction of the housing assembly 300, the distance between the top cover 320 and the support surface 3131 is H, and the distance between the end of the positioning post 220 and the abutment surface 250 is h, where H > h. When H > h, when the stator assembly 200 abuts between the top cover 320 and the support surface 3131, the positioning post 220 can undergo a certain deformation along the axial direction of the stator assembly 200, thereby reasonably increasing the axial abutment force generated by the top cover 320 and the support surface 3131 on the stator assembly 200, and improving the axial positioning effect of the top cover 320 and the support surface 3131 on the stator assembly 200.

[0043] During the assembly of the motor 10, the rotor assembly 100 can be installed into the housing 310 first, then the stator assembly 200 can be installed into the housing 310, and finally the top cover 320 can be installed into the housing 310. After the stator assembly 200 is installed into the housing 310, the limiting protrusion 312 engages with the limiting groove 230, thus positioning the stator assembly 200 circumferentially and radially, preventing circumferential and radial displacement of the stator assembly 200. Furthermore, the supporting surface 3131 of the supporting protrusion 313 exerts an axial abutment force on the stator assembly 200. After the top cover 320 is installed into the housing 310, it is axially abutted between the stepped surface 3111c and the bent body 314. This effectively limits the top cover 320 along the axial direction of the motor 10, preventing axial displacement. The engagement of the slot 3112 with the top cover 320 provides radial and circumferential positioning, preventing further radial and circumferential displacement. Simultaneously, the stator assembly 200 is axially abutted between the top cover 320 and the support surface 3131, effectively positioning the stator assembly 200 axially and preventing axial displacement.

[0044] Therefore, through the combined action of the slot 3112, the bent body 314, and the stepped surface 3111c, the top cover 320 can be positioned along the circumferential, axial, and radial directions of the motor 10, preventing the top cover 320 from undergoing circumferential, axial, and radial displacement relative to the housing assembly 300, thereby achieving effective fixation of the top cover 320 relative to the housing assembly 300. Simultaneously, through the combined action of the top cover 320, the supporting surface 3131 of the supporting protrusion 313, and the limiting protrusion 312, the stator assembly 200 can be positioned along the circumferential, axial, and radial directions of the motor 10, preventing the stator assembly 200 from undergoing circumferential, axial, and radial displacement relative to the housing assembly 300, thereby achieving effective fixation of the stator assembly 200 relative to the housing assembly 300.

[0045] If the stator assembly 200 is fixedly connected to the housing assembly 300 by adhesive bonding, the adhesive layer between the stator assembly 200 and the housing assembly 300 will age, loosen, and detach under the influence of temperature, humidity, and dust corrosion. This will affect the connection strength between the stator assembly 200 and the housing assembly 300, causing the stator assembly 200 to loosen relative to the housing assembly 300, and consequently affecting the assembly accuracy of the motor 10. As a result, the motor 10 will generate vibration and noise during operation.

[0046] Regarding the motor 10 in the above embodiments, the stator assembly 200 can be positioned circumferentially, axially, and radially along the motor 10 through the combined action of the top cover 320, the support protrusion 313, and the limiting protrusion 312. This prevents the stator assembly 200 from undergoing circumferential, axial, and radial displacement relative to the housing assembly 300, thereby achieving effective fixation of the stator assembly 200 relative to the housing assembly 300. This effectively avoids the aging effect of the adhesive layer, thereby improving the connection strength between the stator assembly 200 and the housing assembly 300, improving the assembly accuracy between the various components of the motor 10, and ultimately reducing vibration noise caused by vibration in the motor 10. It can be understood that when the vibration of the motor 10 is reduced, the damage caused by vibration to the motor 10 can be reduced, thereby increasing the service life of the motor 10. At the same time, the assembly between the stator assembly 200 and the housing assembly 300 is simple, making it easy to achieve semi-automatic or fully automatic assembly of the motor 10, thereby improving the assembly efficiency of the motor 10 and reducing manufacturing costs.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An electric motor, characterized in that, include: Rotor assembly; The stator assembly is fitted outside the rotor assembly; and A housing assembly includes an interconnected outer shell and a top cover, the outer shell being disposed around the stator assembly along the axial direction of the housing assembly, the stator assembly abutting between the top cover and the outer shell, one of the outer shell and the stator assembly having a limiting groove and the other including a limiting protrusion, the limiting groove and the limiting protrusion cooperating to position the stator assembly radially and circumferentially along the housing assembly.

2. The motor according to claim 1, characterized in that, The outer casing includes a casing body and a support protrusion. The support protrusion protrudes from the inner circumferential surface of the outer casing and has a support surface. The outer circumferential surface of the stator assembly has a recessed groove. The inner wall surface of the groove includes an abutment surface that is angled to the axial direction of the casing assembly. The support surface and the abutment surface abut against each other along the axial direction of the casing assembly.

3. The motor according to claim 2, characterized in that, The shell body forms a first cavity and a second cavity arranged coaxially. The diameter of the first cavity is larger than the diameter of the second cavity. The bottom wall of the first cavity includes a stepped surface surrounding the second cavity. The stator assembly is housed in the second cavity. The top cover is housed in the first cavity and abuts against the stepped surface.

4. The motor according to claim 2, characterized in that, The stator assembly includes a positioning post along the axial direction of the shell assembly. The distance between the top cover and the support surface is H, and the distance between the end of the positioning post and the abutment surface is h, where H > h.

5. The motor according to claim 1, characterized in that, The stator assembly includes a stator body and a positioning post. The positioning post protrudes along the axial direction of the housing assembly onto the stator body, and the end of the positioning post abuts against the top cover along the axial direction of the housing assembly.

6. The motor according to claim 5, characterized in that, The positioning post is made of an elastic material and is therefore elastic.

7. The motor according to claim 1, characterized in that, The outer shell forms a receiving cavity, and the outer shell has a slot communicating with the receiving cavity. The top cover includes a cover portion and a mating portion. The mating portion protrudes from the edge of the cover portion. The cover portion is located inside the receiving cavity and abuts against the stator assembly. The mating portion is located outside the receiving cavity and engages with the slot.

8. The motor according to claim 7, characterized in that, The outer casing includes a casing body and a bending body. The casing body forms the receiving cavity. The bending body is connected to the casing body and can be bent relative to the casing body. The bending body can abut against the side of the top cover away from the stator assembly along the axial direction of the casing assembly.

9. The motor according to claim 1, characterized in that, The outer shell includes a shell body and the limiting protrusion. The limiting protrusion protrudes from the inner wall of the shell body, and the width of the limiting protrusion decreases along the protruding direction of the limiting protrusion relative to the shell body. The width of the limiting groove decreases along the concave direction of the limiting groove.

10. The motor according to claim 9, characterized in that, A set distance is maintained between the top of the limiting protrusion and the bottom of the limiting groove.

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