Motor and actuator
By using a split-type sheath assembly design, the sleeve is thin while the retaining ring is thick, which solves the problem of magnets detaching at high speeds, achieving motor weight reduction and noise reduction, and improving rotational accuracy.
Patent Information
- Application Number
- CN202411082302.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-08
- Publication Date
- 2026-02-10
AI Technical Summary
In existing motors, the magnets are prone to detach from the shaft due to centrifugal force at high speeds, which leads to a decline in the motor's electrical performance. Furthermore, the uniform wall thickness of the related sheath components results in a larger motor size and greater noise and vibration.
The system adopts a split sheath assembly, with the sleeve and retaining ring designed independently. The sleeve is thin and the retaining ring is thick, and they are connected to the rotating shaft respectively to prevent the magnet from detaching and moving, thus shortening the radial length of the motor.
This achieves lightweighting and noise reduction of the motor, improves rotational eccentricity accuracy, and reduces the size and weight of the motor.
Smart Images
Figure CN121508202A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of robot joints, in particular to a motor and an actuator. BACKGROUND
[0002] The motor of the related art comprises a rotating shaft, a magnetic steel and a stator, the magnetic steel is connected with the rotating shaft, the stator is distributed along the circumference of the rotating shaft, and the magnetic steel is located between the stator and the rotating shaft. The magnetic steel may be separated from the rotating shaft due to the centrifugal force at high rotating speed. Therefore, a sleeve assembly is additionally arranged outside the magnetic steel to solve the problem of separation of the magnetic steel from the rotating shaft. The sleeve assembly of the related art comprises a sleeve and a retaining ring, and the sleeve and the retaining ring are an integral piece. The sleeve is arranged between the magnetic steel and the stator. However, since the sleeve and the retaining ring are an integral piece, the wall thickness of the sleeve is consistent with the wall thickness of the retaining ring. The wall thickness of the retaining ring is relatively thick, and the wall thickness of the sleeve is also relatively thick. Therefore, the distance between the magnetic steel and the stator is increased, and the radial dimension of the motor is increased, so that the volume of the motor is relatively large. SUMMARY
[0003] The application provides a lightweight motor and an actuator.
[0004] The application provides a motor, which comprises a rotating shaft, a magnetic steel and a sleeve assembly. The magnetic steel is connected with the rotating shaft. The magnetic steel is distributed along the circumference of the rotating shaft. The sleeve assembly comprises a sleeve and a retaining ring. The sleeve extends along the axial direction of the rotating shaft. The sleeve has a cylinder cavity. The magnetic steel is at least partially located in the cylinder cavity. The retaining ring extends along the radial direction of the rotating shaft. The retaining ring is connected with the rotating shaft. The sleeve and the retaining ring are in abutment. The thickness of the sleeve is defined as D1 along the radial direction of the rotating shaft. The thickness of the retaining ring is defined as D3 along the axial direction of the rotating shaft. D1 and D3 satisfy the following relationship: D3>D1.
[0005] In the sleeve assembly provided by the application, the sleeve and the retaining ring are in abutment. In other words, the sleeve and the retaining ring are arranged in a split mode. The thickness of the sleeve and the thickness of the retaining ring can be inconsistent. In other words, the thickness of the sleeve is defined as D1 along the radial direction of the rotating shaft, and the thickness of the retaining ring is defined as D3 along the axial direction of the rotating shaft. D3>D1. The thickness of the sleeve can be relatively small. The radial dimension of the motor is reduced, and the volume and the weight of the motor are reduced.
[0006] The application provides an actuator, which comprises a casing, an output assembly and the motor described above. The motor is at least partially located in the casing. The motor is connected with the output assembly. The output assembly is at least partially located in the casing.
[0007] The motor described above is assembled in the actuator. The radial dimension of the actuator is reduced, and the volume and the weight of the actuator are reduced. BRIEF DESCRIPTION OF DRAWINGS
[0008] Figure 1 This is a three-dimensional structural schematic diagram of a compressor according to this application;
[0009] Figure 2 Is it like this? Figure 1 A three-dimensional structural diagram of the compressor from another angle;
[0010] Figure 3 Is it like this? Figure 1 An exploded view of the compressor shown.
[0011] Figure 4 Is it like this? Figure 1 The diagram shows an exploded view of the compressor from another perspective;
[0012] Figure 5 Is it like this? Figure 1 A schematic axial cross-sectional view of the compressor shown.
[0013] Figure 6 Is it like this? Figure 3 A three-dimensional sectional view of the controller shown.
[0014] Figure 7 Is it like this? Figure 3 A three-dimensional sectional view of the housing assembly shown;
[0015] Figure 8 Is it like this? Figure 3 A three-dimensional sectional view of the spindle assembly shown. Detailed Implementation
[0016] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention. All technical solutions and improvements that do not depart from the spirit and scope of this application should be covered within the scope of the claims of this application.
[0017] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, the above terms should not be construed as limiting this invention.
[0018] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.
[0019] This application provides a motor widely used in robot joints, pumps, etc. A motor generally includes a rotor and a stator, which work together. The stator remains stationary, its main function being to cut magnetic lines of force in a rotating magnetic field to generate (output) current. This rotating magnetic field is generated by the rotation of the rotor, making the rotor a crucial component. The rotor's structure and magnetic poles significantly affect the motor's performance. Current motors in related technologies include a shaft, magnets, and a stator. The magnets are connected to the shaft, and the stator is distributed circumferentially along the shaft. The magnets are located between the stator and the shaft. In the context of Industry 4.0, the demand for high-speed, high-performance motors is increasingly strong across various industries. However, increased motor speed means increased centrifugal force on the rotor magnets. At high speeds, the magnets may detach from the shaft due to centrifugal force (the magnets are thrown out), leading to magnetic field instability, decreased electrical performance, and even motor damage. Therefore, to solve the problem of magnets detaching from the shaft, related technologies employ magnet fixing methods... There are several assembly methods, including glue fixing and non-woven tape binding. Glue fixing involves applying glue to the back of the magnet and then attaching it to the rotor shaft. This method is relatively simple, but it is prone to the aforementioned problems. Non-woven tape binding involves winding non-woven tape around the outer surface of the magnet at a certain speed. During binding, room-temperature epoxy resin needs to be applied while binding. The binding process can be done manually or automatically using machinery. After binding, the tail end needs to be locked to prevent tension loss. The drawback of this assembly method is that the wound non-woven tape can expand due to heat, and the installation process is complex, resulting in low mass production efficiency. Therefore, in related technologies, a protective sleeve assembly is used to cover the outside of the magnet to reduce the risk of the magnet being thrown out.
[0020] The related sheathing assembly includes a sleeve and a retaining ring, which are integral parts. The sleeve is positioned between the magnet and the stator. However, because the sleeve and retaining ring are integral parts, the wall thickness of the sleeve and the retaining ring are the same, while the retaining ring has a thicker wall. The reason for the thicker retaining ring wall is that its function is to prevent axial movement between the magnet and the sleeve. Therefore, the retaining ring is subjected to greater forces. If the retaining ring wall is thin, it will not be able to withstand the forces and will be easily broken by shear forces. The sleeve wall is also thick. If the sleeve and retaining ring are not of the same thickness when integrally formed, the connection between them is prone to breakage. Therefore, the sleeve and retaining ring are integral parts, and their wall thicknesses must be consistent. However, if the sleeve wall is thicker, the distance between the magnet and the stator will increase, resulting in an increase in the radial length of the motor and a larger motor size. In addition, a thicker sleeve wall will lead to greater noise and vibration in the motor, as well as less precise rotational eccentricity.
[0021] To solve the above assembly problems, the following will refer to Figures 1 to 8 This application may be described in whole or in part by way of the content of this document.
[0022] Please see Figures 1 to 4As shown, this application provides a motor 100, which includes a rotating shaft 1, magnets 2, and a sheath assembly 3. The magnets 2 are connected to the rotating shaft 1 and are distributed circumferentially along the rotating shaft 1. The sheath assembly 3 includes a sleeve 32 and a retaining ring 31. The sleeve 32 extends axially along the rotating shaft 1 and has a cavity 321. At least part of the magnets 2 are located in the cavity 321. The sleeve 32 serves to enclose part or all of the magnets 2 within the cavity 321, preventing the magnets 2 from being thrown out and detaching from the rotating shaft 1 during high-speed rotation. In this embodiment, all the magnets 2 are located within the cavity 321, that is, the sleeve 32 encloses all the magnets 2. The retaining ring 31 extends radially along the rotating shaft 1 and is connected to the rotating shaft 1. The sleeve 32 and the retaining ring... The retaining ring 31 abuts against the sleeve 32 and / or the magnet 2 in the axial direction, preventing the sleeve 32 and the magnet 2 from moving axially. A small gap can be maintained between the inner wall of the sleeve 32 and the outer wall of the magnet 2, or the inner wall of the sleeve 32 can be in contact with the outer wall of the magnet 2. If the latter, the sleeve 32 can further enhance the connection stability between the magnet 2 and the rotating shaft 1. The thickness of the sleeve 32 is defined as D1 along the radial direction of the rotating shaft 1, and the thickness of the retaining ring 31 is defined as D3 along the axial direction of the rotating shaft 1. D1 and D3 satisfy the following relationship: D3 > D1. It is worth noting that in this embodiment, the sleeve 32 and the retaining ring 31 adopt a split structure, meaning they are manufactured independently. After processing, they are finally assembled onto the rotating shaft 1. Unlike a one-piece structure, the wall thickness of the sleeve 32 and the wall thickness of the retaining ring 31 can be set differently, that is, they have different wall thicknesses. Due to their separate structure, after being assembled onto the rotating shaft 1, the sleeve 32 and the retaining ring 31 abut and contact each other. The abutment between the sleeve 32 and the retaining ring 31 includes direct abutment and indirect abutment. Direct abutment means that the two abut against each other without the need for a third component. Indirect abutment means that the sleeve 32 abuts against the third component first, and then the third component abuts against the retaining ring 31. The third component is, for example, a pad or washer. The key point is that the sleeve 32 and the retaining ring 31 adopt a separate structure, which allows the wall thickness of the sleeve 32 and the retaining ring 31 to be different, that is, defining the sleeve 32 as a separate structure. The thickness of the sleeve 32 is defined as D1, and the thickness of the retaining ring 31 is defined as D3. D1 and D3 satisfy the following relationship: D3 > D1. The reason for setting different wall thicknesses for the two is that, since the function of the sleeve 32 is to prevent the magnet from detaching from the shaft during high-speed rotation, the sleeve 32 is generally not subjected to radial thrust from the magnet. Therefore, it is unnecessary to set the wall thickness of the sleeve 32 too thick. If the wall thickness of the sleeve 32 is too thick, it will only lead to an increase in the gap between the stator and the magnet, resulting in an excessively large radial dimension of the entire motor, and thus an excessively large volume and weight of the motor. Therefore, setting the wall thickness of the sleeve 32 to be thinner is beneficial to the lightweight design of the motor. The gap between the stator and the magnet is reduced, the radial length of the motor is reduced, and the volume and weight of the motor are reduced.Regarding the retaining ring, its wall thickness should be relatively thick because its function is to prevent axial movement between the magnet and the sleeve. The retaining ring experiences significant stress; if the wall thickness is too thin, it will not be able to withstand the stress and will be susceptible to breakage due to shear force. Therefore, the retaining ring wall thickness should be relatively thick to withstand a large axial force. Furthermore, the wall thickness of the retaining ring does not affect the size of the motor. In summary, using the separate structure of the sleeve 32 and retaining ring 31 in this embodiment, the retaining ring can withstand a large axial force, preventing axial movement between the sleeve 32 and retaining ring 31. The sleeve 32 also prevents the magnet from detaching from the shaft during high-speed rotation and contributes to the lightweight design of the motor. Additionally, the thinner wall thickness of the sleeve 32 can reduce motor noise during operation and improve rotational eccentricity accuracy.
[0023] For further information, please refer to [link / reference]. Figure 2 and Figure 6 As shown, the retaining ring 31 includes a first retaining ring 311 and a second retaining ring 312. A sleeve 32 is located between the first retaining ring 311 and the second retaining ring 312. The sleeve 32 has a first opening 322 and a second opening 323, both of which communicate with the cavity 321. The first retaining ring 311 is located at the first opening 322 and abuts against the first cylinder wall 33 forming the first opening 322. The second retaining ring 312 is located at the second opening 323 and abuts against the second cylinder wall 34 forming the second opening 323. The first retaining ring 311 and the second retaining ring 312 can limit the sleeve 32. The sleeve 32 is fixed in a preset position to prevent axial movement during rotation. If the sleeve 32 moves axially, the magnet 2 will be exposed outside the sleeve 32, posing a risk that the magnet 2 will detach from the rotating shaft 1. In this case, the sleeve 32 will not be able to prevent the magnet 2 from being thrown out. In addition, the installation of the first retaining ring 311 and the second retaining ring 312 is relatively simple. The sleeve 32 can be put into one end of the rotating shaft 1 first, and the first retaining ring 311 and the second retaining ring 312 can be pressed into both ends of the rotating shaft 1 respectively. Alternatively, the first retaining ring 311 or the second retaining ring 312 can be put into the sleeve first, and then the other retaining ring can be pressed into the sleeve. The assembly is flexible and convenient.
[0024] Please see Figure 5 As shown, the magnet 2 is bonded to the circumferential sidewall of the rotating shaft 1. The magnet 2 includes multiple magnet groups 21, which are arranged along the axial direction of the rotating shaft 1. Each magnet group 21 includes multiple segmented magnets 211, which are evenly arranged along the circumferential direction of the rotating shaft 1. The magnetic poles of adjacent segmented magnets 211 are opposite. All segmented magnets 211 are bonded to the circumferential sidewall of the rotating shaft 1, and there is a gap Q between adjacent segmented magnets 211.
[0025] Please refer to it again. Figure 2As shown, both the first retaining ring 311 and the second retaining ring 312 are interference-fitted with the rotating shaft 1. The first retaining ring 311 covers the first cylinder opening 322, and the second retaining ring 312 covers the second cylinder opening 323. In this embodiment, the first retaining ring 311 and the second retaining ring 312 are interference-fitted with the rotating shaft 1. The first retaining ring 311 and the second retaining ring 312 are pressed into the rotating shaft 1 to achieve a fixed connection. Of course, in order to further enhance the connection stability between the first retaining ring 311 and the second retaining ring 312 and the rotating shaft 1, in other embodiments, after the first retaining ring 311 and the second retaining ring 312 are interference-fitted with the rotating shaft 1, the first retaining ring 311 is welded to the rotating shaft 1. Similarly, the second retaining ring 312 is welded to the rotating shaft 1 to enhance the connection strength. Alternatively, the two can be welded together using reinforcing members or the like. In other embodiments, the first retaining ring 311 and the second retaining ring 312 are not interference-fitted with the rotating shaft 1. Instead, the first retaining ring 311 and the second retaining ring 312 are first fitted onto the rotating shaft 1, and then the first retaining ring 311 is welded to the rotating shaft 1. Similarly, the second retaining ring 312 is welded to the rotating shaft 1. Alternatively, the two can be welded together using reinforcing members or the like, i.e., directly using welding for fixation. The purpose of the first retaining ring 311 blocking the first cylinder opening 322 and the second retaining ring 312 blocking the second cylinder opening 323 is to make the cylinder cavity 321 form a relatively sealed space. In this way, external impurities are not easily allowed to enter the cylinder cavity 321, preventing impurities from entering and affecting the magnet 2.
[0026] In addition, for easier installation, please refer to Figure 7The first retaining ring 311 includes a first part 1-1 and a second part 1-2, which are connected and fixed. The rotating shaft 1 is located between the first part 1-1 and the second part 1-2. The second retaining ring 312 includes a third part 2-1 and a fourth part 2-2, which are connected and fixed. The rotating shaft 1 is located between the third part 2-1 and the fourth part 2-2. In other words, in this embodiment, both the first retaining ring 311 and the second retaining ring 312 are set as separate structures. Of course, in some embodiments, the first retaining ring 311 can be set as a single piece, and the second retaining ring 312 can also be set as a single piece. The advantage of the separate structure is that during installation, it can be installed along the radial direction of the rotating shaft 1, while a single piece must be installed separately. The first retaining ring 311 and the second retaining ring 312 are installed along the axial direction of the rotating shaft 1. In terms of installation path, radial installation is more convenient. In addition, in this embodiment, after the first part 1-1 and the second part 1-2 are radially connected along the rotating shaft 1, they can be fixed by welding or snap-fitting. If the first retaining ring 311 is an interference fit, then both the first part 1-1 and the second part 1-2 are interference fit with the rotating shaft 1. Similarly, after the third part 2-1 and the fourth part 2-2 are radially connected along the rotating shaft 1, they can be fixed by welding or snap-fitting. If the second retaining ring 312 is an interference fit, then both the third part 2-1 and the fourth part 2-2 are interference fit with the rotating shaft 1.
[0027] Please see Figure 3 and Figure 4 The motor includes a stator 4, which is distributed circumferentially along the shaft 1. The sleeve 32 is located between the magnet 2 and the stator 4. Along the radial direction of the shaft 1, the distance between the inner peripheral wall of the stator 4 and the outer peripheral wall of the magnet 2 is defined as D2. D1 and D2 satisfy the following relationship: D1 < D2, so as to shorten the radial length of the motor and make the motor lighter.
[0028] Furthermore, in this embodiment, an actuator is provided. This actuator is applied to a robot joint. Due to the nature of some robot joints, the actuator must have a lightweight structure. Please refer to [link to relevant documentation]. Figure 8 As shown, the actuator includes a housing 5, an output component 6, and a motor 100. The motor 100 is at least partially located in the housing 5. The motor 100 is connected to the output component 6, which is also at least partially located in the housing 5. Due to the lightweight design of the motor 100, the volume and weight of the actuator equipped with the motor described above are correspondingly reduced.
[0029] Please see Figure 8As shown, the motor 100 includes a stator 4, which includes a stator core 41, a coil winding 42, and an insulating member 43. The insulating member 43 covers at least a portion of the outer wall of the stator core 41, and the coil winding 42 is wound around the insulating member 43. The stator 4 is distributed circumferentially along the shaft 1, and the sleeve 32 is located between the magnet 2 and the stator 4.
[0030] Please refer to it again. Figure 8 The rotating shaft 1 includes a main body 11, a first support 12, and a second support 13. The main body 11 extends axially along the rotating shaft 1. The main body 11, the first support 12, and the second support 13 are integral parts. The first support 12 protrudes along the outer side wall of the main body 11, and the second support 13 protrudes along the outer side wall of the main body 11. The sheath assembly 3 is located between the first support 12 and the second support 13. The actuator includes a first bearing 8, a first bearing seat 9, a second bearing 7, and a second bearing seat 10. The first bearing seat 9 and the machine... The housing 5 is a single piece. The first bearing seat 9 protrudes towards the rotating shaft 1 and is located at one end of the housing 5. The first bearing 8 connects the first bearing seat 9 and the first support part 12. The second bearing seat 10 is connected to the other end of the housing 5. The second bearing 7 connects the second bearing seat 10 and the second support part 13. The first bearing 8 and the second bearing 7 are located at both ends of the main body 11, respectively. The first bearing 8 and the second bearing 7 are used to support both ends of the rotating shaft 1, enabling the rotating shaft 1 to rotate stably, thereby allowing the lead screw 61 to move and extend smoothly. The first bearing seat 9 and the second bearing seat 10 respectively support and limit the first bearing 8 and the second bearing 7, preventing them from disengaging.
[0031] Please refer to it again. Figure 8 The output component 6 includes a lead screw 61, and the rotating shaft 1 has a travel channel V. The travel channel V extends through the main body 11 along the axial direction of the rotating shaft 1. The rotating shaft 1 includes a threaded portion 14, which is located in the travel channel V. The lead screw 61 is threadedly engaged with the threaded portion 14. The lead screw 61 can move along the axial direction of the actuator and can extend out of the housing 5. Thus, when the rotating shaft 1 is driven to rotate, the lead screw 61 threadedly engaged with the rotating shaft 1 can extend and retract along the axial direction of the rotating shaft 1, thereby realizing the extension or retraction of the lead screw 61.
[0032] The actuator includes a first end cover 15 and a second end cover 16. The first end cover 15 is connected to one end of the housing 5, and the second end cover 16 is connected to the other end of the housing 5. The first end cover 15 has a port 151, and the lead screw 61 is located at the port 151. The first end cover 15 includes a pressing part 152, which extends along the first bearing 8. The first bearing 8 includes an inner ring 82 and an outer ring 81. The two sides of the outer ring 81 are respectively connected to the pressing part 152 and the first bearing seat 9. The actuator includes a pressing member 18, which is sleeved on the main body 11. The two sides of the inner ring 82 are respectively connected to the first support part 12 and the pressing member 18. Under the action of the first support part 12, the first bearing seat 8, the pressing member 18, and the pressing part 152, the first bearing 8 is axially and radially limited to prevent the first bearing 8 from detaching from the housing.
[0033] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention.
[0034] The functions and structural principles of the present invention have been shown and explained in the embodiments. Without deviating from the principles, the implementation of the present invention can be modified or altered.
Claims
1. An electric motor, characterized in that, The motor (100) includes a rotating shaft (1), a magnet (2), and a sheath assembly (3). The magnet (2) is connected to the rotating shaft (1) and is distributed circumferentially along the rotating shaft (1). The sheath assembly (3) includes a sleeve (32) and a retaining ring (31). The sleeve (32) extends axially along the rotating shaft (1) and has a cavity (321). The magnet (2) is at least partially located in the cavity. (321) The retaining ring (31) extends radially along the rotating shaft (1) and is connected to the rotating shaft (1). The sleeve (32) abuts against the retaining ring (31). The thickness of the sleeve (32) is defined as D1 along the radial direction of the rotating shaft (1), and the thickness of the retaining ring (31) is defined as D3 along the axial direction of the rotating shaft (1). D1 and D3 satisfy the following relationship: D3 > D1.
2. The motor according to claim 1, characterized in that, The retaining ring (31) includes a first retaining ring (311) and a second retaining ring (312). The sleeve (32) is located between the first retaining ring (311) and the second retaining ring (312). The sleeve (32) has a first opening (322) and a second opening (323). Both the first opening (322) and the second opening (323) are connected to the cavity (321). The first retaining ring (311) is located at the first opening (322) and abuts against the first cylinder wall (33) forming the first opening (322). The second retaining ring (312) is located at the second opening (323) and abuts against the second cylinder wall (34) forming the second opening (323).
3. The motor according to claim 2, characterized in that, The magnet (2) is bonded to the circumferential sidewall of the rotating shaft (1). The magnet (2) includes multiple magnet groups (21), which are arranged along the axial direction of the rotating shaft (1). The first retaining ring (311) and the second retaining ring (312) are both interference fit with the rotating shaft (1). The first retaining ring (311) covers the first cylinder opening (322), and the second retaining ring (312) covers the second cylinder opening (323).
4. The motor according to claim 3, characterized in that, The magnet group (21) includes multiple segmented magnets (211). The multiple segmented magnets (211) are evenly arranged along the circumferential direction of the rotating shaft (1). The magnetic poles of adjacent segmented magnets (211) are opposite. The multiple segmented magnets (211) are all bonded to the circumferential sidewall of the rotating shaft (1). There is a gap (Q) between adjacent segmented magnets (211). The first retaining ring (311) includes a first part (1-1) and a second part (1-2), the first part (1-1) and the second part (1-2) are connected and fixed, and the rotating shaft (1) part is located between the first part (1-1) and the second part (1-2). The second retaining ring (312) includes a third part (2-1) and a fourth part (2-2), the third part (2-1) and the fourth part (2-2) are connected and fixed, and the rotating shaft (1) part is located between the third part (2-1) and the fourth part (2-2).
5. The motor according to any one of claims 1 to 4, characterized in that, The motor includes a stator (4) which is distributed circumferentially along the shaft (1). The sleeve (32) is located between the magnet (2) and the stator (4). Along the radial direction of the shaft (1), the distance between the inner peripheral wall of the stator (4) and the outer peripheral wall of the magnet (2) is defined as D2, where D1 and D2 satisfy the following relationship: D1 < D2.
6. An actuator, characterized in that, The actuator includes a housing (5), an output component (6), and a motor (100) as described in any one of claims 1 to 5, wherein the motor (100) is at least partially located in the housing (5), and the motor (100) is connected to the output component (6), wherein the output component (6) is at least partially located in the housing (5).
7. The actuator according to claim 6, characterized in that, The motor (100) includes a stator (4), which includes a stator core (41), a coil winding (42), and an insulating member (43). The insulating member (43) covers at least a portion of the outer wall of the stator core (41), and the coil winding (42) is wound around the insulating member (43). The stator (4) is distributed circumferentially along the shaft (1), and the sleeve (32) is located between the magnet (2) and the stator (4).
8. The actuator according to claim 6, characterized in that, The rotating shaft (1) includes a main body (11), a first support (12), and a second support (13). The main body (11) extends axially along the rotating shaft (1). The main body (11), the first support (12), and the second support (13) are integral parts. The first support (12) protrudes along the outer side wall of the main body (11), and the second support (13) protrudes along the outer side wall of the main body (11). The sheath assembly (3) is located between the first support (12) and the second support (13). The actuator includes a first bearing (8) and a first bearing seat (9). The second bearing (7) and the second bearing seat (10) are integrated with the first bearing seat (9) and the housing (5). The first bearing seat (9) protrudes towards the rotating shaft (1) and is located at one end of the housing (5). The first bearing (8) connects the first bearing seat (9) and the first support part (12). The second bearing seat (10) is connected to the other end of the housing (5). The second bearing (7) connects the second bearing seat (10) and the second support part (13). The first bearing (8) and the second bearing (7) are located at both ends of the main body (11).
9. The actuator according to claim 8, characterized in that, The output assembly (6) includes a lead screw (61), the shaft (1) has a travel channel (V) that extends axially through the main body (11) along the shaft (1), the shaft (1) includes a threaded portion (14) located in the travel channel (V), the lead screw (61) is threadedly engaged with the threaded portion (14), the lead screw (61) is axially movable along the actuator, and the lead screw (61) is able to extend out of the housing (5).
10. The actuator according to claim 9, characterized in that, The actuator includes a first end cap (15) and a second end cap (16). The first end cap (15) is connected to one end of the housing (5), and the second end cap (16) is connected to the other end of the housing (5). The first end cap (15) has a port (151), and the lead screw (61) is located at the port (151). The first end cap (15) includes a pressing part (152) that extends along the first bearing (8). The first bearing (8) includes an inner ring (82) and an outer ring (81). The two sides of the outer ring (81) are respectively connected to the pressing part (152) and the first bearing seat (9). The actuator includes a pressing member (18) that is sleeved on the main body (11). The two sides of the inner ring (82) are respectively connected to the first support part (12) and the pressing member (18).