Damping device and motor
By introducing a phonon crystal structure and multilayer elastic material into the motor damping ring, the problem of poor performance of traditional motor damping methods in multiple frequency ranges is solved, achieving stable operation and noise reduction of the motor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2026-04-03
AI Technical Summary
Traditional motor vibration reduction methods struggle to achieve good vibration reduction effects across multiple frequency ranges, leading to severe vibration and noise problems that affect motor efficiency and lifespan.
The vibration damping ring employs a phononic crystal structure. By filling the space between the inner and outer rings with a first elastic material and placing a rigid core therein, a periodic arrangement is formed. Combined with partitions and elastic materials of different densities, a multi-layer vibration damping structure is constructed to absorb and dissipate vibration energy and avoid resonance.
It effectively reduces motor vibration and noise at various operating frequencies, improves motor operation stability and reliability, reduces noise, and prevents equipment damage.
Smart Images
Figure CN224083329U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vibration damping device technology, and in particular to a vibration damping device and a motor. Background Technology
[0002] During motor operation, significant vibrations and noise are generated due to unbalanced loads, mechanical wear, and other factors. These vibrations not only affect the motor's efficiency but can also lead to equipment damage, increased noise, and reduced lifespan. Traditional motor vibration reduction methods mainly rely on the damping properties of materials or the use of vibration isolation devices. However, these methods often struggle to achieve effective vibration reduction across multiple frequency ranges, and the vibration and noise remain noticeable during motor operation. Utility Model Content
[0003] This utility model provides a vibration damping device and a motor to solve the problems of high vibration and noise during motor operation.
[0004] In a first aspect, embodiments of the present invention provide a vibration damping device, comprising:
[0005] The housing has an inner cavity that can accommodate the motor body;
[0006] A vibration damping ring is disposed within the receiving cavity and surrounds the outer side of the motor body. The vibration damping ring includes an inner ring, an outer ring, and a first elastic material. The inner ring and the outer ring are coaxially arranged alternately, and the first elastic material is filled between the inner ring and the outer ring.
[0007] The first elastic material contains a plurality of rigid cores extending axially in the damping ring, and all the rigid cores are periodically arranged in the circumferential direction of the damping ring according to their quantity.
[0008] In the vibration damping device provided in this embodiment of the utility model, a plurality of partitions are connected between the outer ring and the inner ring. All the partitions are distributed at intervals in the circumferential direction of the vibration damping ring, and the first elastic material is filled between each two adjacent partitions.
[0009] In the vibration damping device provided in this embodiment of the utility model, all the partitions are equally spaced in the circumferential direction of the vibration damping ring, and the number and arrangement of the rigid cores between each pair of adjacent partitions are the same.
[0010] In the vibration damping device provided in this embodiment of the utility model, the vibration damping ring is provided with a notch, and the notch penetrates the inner and outer sides of the vibration damping ring along the radial direction of the vibration damping ring.
[0011] In the vibration damping device provided in this embodiment of the present invention, a second elastic material is filled between the inner ring and the motor body, and between the outer ring and the housing, wherein the second elastic material has a different density than the first elastic material.
[0012] In the vibration damping device provided in this embodiment of the utility model, the housing includes a bottom shell and a top cover. The bottom shell is provided with a first connecting part, and the top cover is provided with a second connecting part. The first connecting part and the second connecting part are detachably connected.
[0013] In the vibration damping device provided in this embodiment of the utility model, one of the first connecting part and the second connecting part is a tenon, and the other is a mortise. The tenon is fitted into the mortise to connect the bottom shell and the top cover.
[0014] In the vibration damping device provided in this embodiment of the utility model, the upper cover is provided with a shaft hole, the shaft hole connects the receiving cavity to the outside of the housing, and the shaft hole is used to insert a rotating shaft connected to the motor body.
[0015] In the vibration damping device provided in this embodiment of the utility model, the upper cover is provided with a wire hole, which connects the receiving cavity to the outside of the housing, and the wire hole is used to insert the wire connected to the motor body.
[0016] Secondly, this utility model provides an electric motor that includes the vibration damping device described in the first aspect.
[0017] This utility model provides a vibration damping device and a motor. The vibration damping device includes a housing and a vibration damping ring. The housing has an inner cavity for accommodating a motor body. The vibration damping ring is disposed within the cavity and surrounds the outer side of the motor body. The vibration damping ring includes an inner ring, an outer ring, and a first elastic material. The inner ring and the outer ring are coaxially arranged alternately. The first elastic material fills the space between the inner ring and the outer ring. The first elastic material contains a plurality of rigid cores extending axially from the vibration damping ring. All the rigid cores are periodically arranged in the circumferential direction of the vibration damping ring. The vibration damping device of this application fills the space between the inner and outer rings of the vibration damping ring with a first elastic material and contains a plurality of rigid cores periodically arranged in the circumferential direction of the vibration damping ring within the first elastic material. This forms a phononic crystal structure for the entire vibration damping ring. Through the bandgap characteristics of the phononic crystal, the vibration and noise generated by the motor at various operating frequencies are effectively reduced, making the motor operation more stable and reliable. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 A cross-sectional view of the vibration damping device provided in this embodiment of the present invention in an application scenario;
[0020] Figure 2 An axial view of the vibration damping ring provided in an embodiment of this utility model;
[0021] Figure 3 A cross-sectional view of the housing provided in an embodiment of this utility model;
[0022] Figure 4 A cross-sectional view of the bottom shell provided in an embodiment of this utility model;
[0023] Figure 5 A top view of the bottom shell provided in an embodiment of this utility model;
[0024] Figure 6 A cross-sectional view of the top cover provided in an embodiment of this utility model;
[0025] Figure 7 This is a top view of the top cover provided in an embodiment of the present utility model.
[0026] The labels for the attached figures are as follows:
[0027] 10. Housing; 101. Receiving cavity; 11. Bottom shell; 110. First connecting part; 12. Top cover; 120. Second connecting part; 121. Shaft hole; 122. Wire hole; 123. Fixing hole; 20. Vibration damping ring; 21. Inner ring; 22. Outer ring; 23. First elastic material; 201. Notch; 24. Partition; 30. Rigid core; 40. Second elastic material; 100. Motor body; 110. Rotating shaft. Detailed Implementation
[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0029] The directional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," and "side," are merely for reference to the accompanying drawings. Therefore, the directional terms used are for explanation and understanding of this invention, and not for limiting it. Furthermore, in the accompanying drawings, structures that are similar or identical are indicated by the same reference numerals.
[0030] Reference Figure 1 and Figure 2 This invention illustrates an embodiment of the vibration damping device and motor provided by this utility model. The structure and working principle of the vibration damping device and motor are described in detail below with reference to the accompanying drawings. The vibration damping device includes a housing 10 and a damping ring 20. The housing 10 has an inner cavity 101 formed therein to accommodate a motor body 100. The damping ring 20 is disposed within the cavity 101 and surrounds the outer side of the motor body 100. The damping ring 20 includes an inner ring 21, an outer ring 22, and a first elastic material 23. The inner ring 21 and the outer ring 22 are coaxially arranged alternately. The first elastic material 23 fills the space between the inner ring 21 and the outer ring 22. The first elastic material 23 contains a plurality of rigid cores 30 extending axially from the damping ring 20. All the rigid cores 30 are periodically arranged in the circumferential direction of the damping ring 20 according to their quantity.
[0031] In practical implementation, the vibration damping device is mainly used for vibration reduction and noise reduction of the motor. The vibration damping device is generally composed of a housing 10 and a damping ring 20. The housing 10 is mainly used to house the entire motor body 100 and is connected and fixed to the main structure of the system that needs to use the motor by means of a fixing hole 123. A receiving cavity 101 is formed on the inner side of the housing 10 to accommodate the entire motor body 100. The shape of the receiving cavity 101 can be designed according to the shape of the motor body 100, and is usually designed as a cylindrical cavity structure. The damping ring 20 is integrally disposed in the receiving cavity 101 and surrounds the outer side of the motor body 100, enclosing it along the axial direction of the motor body 100. The damping ring 20 includes an inner ring 21, an outer ring 22, and a first elastic material 23. The inner ring 21 and the outer ring 22 are coaxially arranged alternately, forming an annular groove between them. The first elastic material 23 fills the groove between the inner ring 21 and the outer ring 22. The first elastic material 23 is a material with resilience, specifically elastic rubber. Within the first elastic material 23, there are several rigid cores 30. Each rigid core 30 is a straight, columnar strip and possesses rigidity. The rigid cores 30 can be designed using metal or other rigid solid materials; specifically, an iron core. The number of rigid cores 30 is several, and all rigid cores 30 are arranged periodically in the circumferential direction of the damping ring 20. This periodic arrangement means that the number of rigid cores 30 is periodic. In this embodiment, for example... Figure 2As shown, the rigid core 30 is arranged in a 2-1-2-1-2 cycle around the circumference of the damping ring 20. In other embodiments, the rigid core 30 can also be arranged in other periodic patterns. Because the rigid core 30 is arranged periodically around the circumference of the damping ring 20, the combination of elastic and rigid materials, and the periodic arrangement of the rigid materials, forms a phononic crystal structure with a specific frequency bandgap. A phononic crystal is a material or structure with a periodic distribution of elastic constants and density. Typically, a phononic crystal is composed of periodic structures of two or more different materials. The formation of a phononic crystal is based on periodic vibration modes in the crystal lattice. The vibrational energy of atoms in the lattice can be considered as a collective expression of phonon bands. The existence of the periodic structure of the lattice causes the vibrational energy to form a "bandgap" in the energy spectrum, thereby limiting the propagation of sound waves. A phononic crystal structure can also exhibit an "absolute bandgap," meaning that the propagation of elastic waves in all directions is prohibited within a specific frequency range, effectively reducing vibration. In practical applications, the motor body 100 will generate vibrations at a certain frequency during operation. The damping ring 20, as a phononic crystal barrier, can convert vibration kinetic energy into deformation energy through the "band gap" of the phononic crystal. That is, the damping ring 20 can generate small deformations when subjected to vibration, thereby effectively absorbing and dissipating vibration energy, reducing vibration and noise. It can also absorb vibration waves of specific frequencies, and through specific size design, it can also avoid resonance phenomena, ensuring that the motor can operate stably for a long time.
[0032] In this embodiment, the vibration damping device fills the space between the inner and outer rings of the vibration damping ring with a first elastic material, and inserts several rigid cores arranged periodically in the circumferential direction of the vibration damping ring into the first elastic material, so that the entire vibration damping ring forms a phononic crystal structure. Through the bandgap characteristics of the phononic crystal, the vibration and noise generated by the motor at various operating frequencies can be effectively reduced, thereby improving the stability and reliability of motor operation.
[0033] In one embodiment, reference is made to Figure 2A plurality of partitions 24 are connected between the outer ring 22 and the inner ring 21. All the partitions 24 are spaced apart in the circumferential direction of the damping ring 20, and the space between each two adjacent partitions 24 is filled with the first elastic material 23. In a specific implementation, a plurality of partitions 24 are connected between the inner ring 21 and the outer ring 22 of the damping ring 20. The partitions 24 are located in the annular groove between the inner ring 21 and the outer ring 22. All the partitions 24 are spaced apart in the circumferential direction of the damping ring 20, and a plurality of spaces are separated between the inner ring 21 and the outer ring 22. The space between two adjacent partitions 24 is an independent space. The space between each two adjacent partitions 24 is filled with the first elastic material 23. The partitions 24 form a mechanical constraint on the first elastic material 23 and the rigid core 30, which can limit the movement of the rigid core 30 in the first elastic material 23 and ensure that it will not undergo large displacement when subjected to external force. Furthermore, due to the excellent damping properties of the first elastic material 23, which can absorb and dissipate energy, it absorbs some energy through deformation before the vibration wave reaches the rigid core 30, thereby reducing the swaying of the rigid core 30. The separation by the partition 24 further enhances the effect of the first elastic material 23 in limiting the swaying of the rigid core 30. Simultaneously, friction is generated at the contact surface between the rigid core 30 and the first elastic material 23, which to some extent prevents the movement of the rigid core 30. The partition 24 further increases the friction between the rigid core 30 and the first elastic material 23, making the rigid core 30 more stable. Overall, the design of the partition 24 ensures the stability of the rigid core 30 and the first elastic material 23, making the overall phonon crystal structure of the damping ring 20 more stable and improving the vibration reduction and noise reduction effect.
[0034] Furthermore, referring to Figure 2 All the partitions 24 are equally spaced in the circumferential direction of the damping ring 20, and the number and arrangement of the rigid cores 30 between any two adjacent partitions 24 are the same. Specifically, all the partitions 24 are evenly distributed in the circumferential direction of the damping ring 20, with the distance between any two adjacent partitions 24 being the same. Each pair of adjacent partitions 24 is filled with a first elastic material 23, which contains a certain number of rigid cores 30. The number and arrangement of the rigid cores 30 between any two adjacent partitions 24 are the same. Overall, the rigid cores 30 between any two adjacent partitions 24 constitute an arrangement cycle. Figure 2As shown, eight rigid cores 30 are arranged between every two adjacent partitions 24, and the arrangement is always 2-1-2-1-2. By distributing the partitions 24 at equal intervals and setting the same number and arrangement of rigid cores 30 between every two adjacent partitions 24, the partitions 24 can evenly restrict the swaying of the rigid cores 30, further ensuring the stability of the rigid cores 30 and the first elastic material 23, making the overall phononic crystal structure of the damping ring 20 more ordered and stable, and further improving the vibration reduction and noise reduction effect.
[0035] In one embodiment, reference is made to Figure 2 The damping ring 20 has a notch 201 that penetrates both the inner and outer sides of the damping ring 20 radially. Specifically, a notch 201 is provided on the damping ring 20, penetrating both the inner and outer sides of the damping ring 20 radially, thus dividing the damping ring 20 into two ends. The distance between the two ends is the width of the notch 201. In the design, the width of the notch 201 can be determined based on the inner and outer diameters of the damping ring 20. The design is based on the relationship w = k(2D - d), where w is the width of the notch 201, D is the outer diameter of the damping ring 20, d is the inner diameter of the damping ring 20, and k is a constant, typically 0.1 ≤ k ≤ 0.5. Simultaneously, the width w of the notch 201 should also meet a certain absolute value range to ensure the stability of the structure and the damping effect. By designing the notch 201, the propagation path and mode of vibration waves in the damping ring 20 structure can be changed. Furthermore, by precisely designing the position, size, and shape of the opening, the reflection, transmission, and diffraction of waves can be effectively controlled, thereby achieving directional propagation or blocking of waves.
[0036] In one embodiment, reference is made to Figure 1The inner ring 21 and the motor body 100, and the outer ring 22 and the housing 10 are both filled with a second elastic material 40, wherein the second elastic material 40 has a different density than the first elastic material 23. In specific implementation, a certain gap is left between the inner ring 21 of the damping ring 20 and the motor body 100, and a certain gap is left between the outer ring 22 of the damping ring 20 and the housing 10. Spaces are left between the inner ring 21 and the motor body 100 and between the outer ring 22 and the housing 10. A second elastic material 40 is filled between the inner ring 21 and the motor body 100 and between the outer ring 22 and the housing 10. The second elastic material 40 stabilizes the damping ring 20 in the receiving cavity 101. The entire device has three layers of elastic material from the inside out, from the motor body 100 to the housing 10. The first elastic material 23 is sandwiched between two layers of second elastic material 40. The first elastic material 23 and the second elastic material 40 are separated by the inner ring 21 and the outer ring 22 of the damping ring 20. By filling the space between the inner ring 21 and the motor body 100 and between the outer ring 22 and the housing 10 with the second elastic material 40, the damping effect of the system can be further enhanced. In terms of physical properties, the second elastic material 40 has a different density than the first elastic material 23. Specifically, the first elastic material 23 and the second elastic material 40 are made of elastic rubbers with different densities. The densities of these different elastic rubbers are as follows: the density of natural rubber is 1.15 g / cm³. 3 The density of chloroprene rubber is 1.65 g / cm³. 3 The density of ethylene propylene diene monomer (EPDM) rubber is 0.87 g / cm³. 3 The density of silicone rubber is generally between 1.2 and 1.4 g / cm³. 3 The density of fluororubber is generally between 1.2 and 1.8 g / cm³. 3 Between these values, the density of ethylene propylene diene monomer (EPDM) rubber is 0.865 g / cm³. 3The first elastic material 23 and the second elastic material 40 can be any two elastic rubbers with different densities. The different density ratios of the first elastic material 23 and the second elastic material 40 affect the performance of the damping ring 20. The specific density relationship between the second elastic material 40 and the first elastic material 23 is determined according to the application scenario. When the density of the first elastic material 23 is greater than that of the second damping material, it can provide a higher damping effect, helping to absorb more vibration energy, suitable for high-frequency vibration and high-impact applications. When the density of the first elastic material 23 is less than that of the second elastic material 40, the interior of the damping ring 20 is softer, providing a better buffering effect, suitable for low-frequency vibration and light-impact applications. Therefore, the densities of the first elastic material 23 and the second elastic material 40 can be selected and designed according to the actual application scenario, thus forming a multi-layered structure of different materials. Due to the impedance differences of the materials, effective sound wave scattering and band gap formation can be achieved, thereby achieving the corresponding vibration reduction effect.
[0037] In one embodiment, reference is made to Figures 3 to 7 The housing 10 includes a bottom shell 11 and a top cover 12. The bottom shell 11 has a first connecting portion 110, and the top cover 12 has a second connecting portion 120. The first connecting portion 110 and the second connecting portion 120 are detachably connected. In a specific implementation, the housing 10 is mainly composed of two parts: the bottom shell 11 and the top cover 12. The inner sides of the bottom shell 11 and the top cover 12 are cavities. After the bottom shell 11 and the top cover 12 are connected, they together form a receiving cavity 101 for accommodating the motor housing 10. The bottom shell 11 and the top cover 12 are detachably connected. The first connecting portion 110 is provided on the bottom shell 11, and the second connecting portion 120 is provided on the top cover 12. The first connecting portion 110 and the second connecting portion 120 can be designed as a snap-fit structure or a tenon and mortise structure. In practical applications, the bottom shell 11 and the top cover 12 are installed in the disassembled state to install the motor body 100 and the vibration damping ring 20. They are connected together by the first connecting part 110 and the second connecting part 120. The bottom shell 11 and the top cover 12 are fixed to form the entire housing 10, so that the motor body 100 is wrapped inside the entire housing 10, and the vibration damping ring 20 is wrapped around the outside of the motor body 100, together forming a vibration reduction and noise reduction structure.
[0038] Furthermore, referring to Figures 3 to 7In this embodiment, one of the first connecting part 110 and the second connecting part 120 is a tenon, and the other is a mortise. The tenon engages with the mortise to connect the bottom shell 11 to the top cover 12. Specifically, the bottom shell 11 and the top cover 12 are connected using a tenon and mortise structure. One of the first connecting part 110 and the second connecting part 120 is designed as a tenon, and the other as a mortise. This embodiment uses the example of the first connecting part 110 on the bottom shell 11 being a tenon and the second connecting part 120 on the top cover 12 being a mortise. The bottom shell 11 is connected and fixed by the tenon engaging with the mortise of the top cover 12. The cooperation between the tenon and the mortise makes the connection between the bottom shell 11 and the top cover 12 more stable and less prone to loosening. This not only enhances the overall structural integrity of the shell 10 but also effectively disperses external forces, ensuring stability during long-term use. Furthermore, the tenon and mortise fitting connection facilitates the repair, modification and disassembly of the bottom shell 11 and the top cover 12. The bottom shell 11 and the top cover 12 will not be damaged when disassembling, which greatly facilitates subsequent maintenance and adjustment.
[0039] In one embodiment, reference is made to Figure 6 and Figure 7 The upper cover 12 is provided with a shaft hole 121, which connects the receiving cavity 101 to the outside of the housing 10. The shaft hole 121 is used to insert a rotating shaft 110 connected to the motor body 100. In a specific implementation, part of the rotating shaft 110 is disposed inside the motor body 100 and connected to the rotor, while the other part extends out of the motor body 100 to output rotational power. In this embodiment, the upper cover 12 is provided with a shaft hole 121, which connects the receiving cavity 101 inside the housing 10 to the outside of the housing 10. The shape of the shaft hole 121 is adapted to the rotating shaft 110, and is a circular hole with a diameter slightly larger than that of the rotating shaft 110. The rotating shaft 110 extends out of the housing 10 by passing through the shaft hole 121, thereby allowing it to connect and cooperate with components or structures that need to be driven.
[0040] In one embodiment, reference is made to Figure 6 and Figure 7 The upper cover 12 is provided with a wire-passing hole 122, which connects the receiving cavity 101 to the outside of the housing 10. The wire-passing hole 122 is used to pass through wires connected to the motor body 100. In a specific implementation, the motor body 100 is provided with terminals for connecting wires to transmit control signals. In this embodiment, the upper cover 12 is provided with a wire-passing hole 122, which connects the receiving cavity 101 inside the housing 10 to the outside of the housing 10. The shape of the shaft hole 121 is arbitrary, and multiple wires can be passed through it. The wires are connected to the terminals on the motor body 100 by passing through the shaft hole 121, thereby completing the wiring.
[0041] This utility model embodiment also provides a motor that includes the vibration damping device described in the above embodiments. In addition, the motor includes a stator, rotor, and other structures. The vibration damping device is designed as part of the motor's housing, thereby achieving vibration reduction and noise reduction. Since the specific structure and working principle of the vibration damping device have been described in detail in the preceding description, they will not be repeated here for the sake of brevity.
[0042] The motor in this embodiment, due to the use of the vibration reduction device provided in this embodiment, experiences less vibration and noise during operation, resulting in more stable and reliable motor operation.
[0043] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. A vibration damping device characterized by comprising: The application relates to a damping device for a motor. The damping device comprises a shell, a damping ring and a second elastic material. The shell has an accommodation cavity formed on the inner side of the shell and capable of accommodating a motor body. The damping ring is arranged in the accommodation cavity and surrounds the outer side of the motor body.
2. The vibration damping device according to claim 1, characterized by The damping ring comprises an inner ring, an outer ring and a first elastic material.
3. The vibration damping device according to claim 2, characterized by The inner ring and the outer ring are coaxially arranged.
4. The vibration damping device according to claim 1, characterized by The first elastic material is filled between the inner ring and the outer ring.
5. Damping device according to any of claims 1-4, characterized in that A plurality of rigid cores extending in the axial direction of the damping ring are arranged in the first elastic material.
6. The vibration damping device according to any one of claims 1 to 4, characterized by All the rigid cores are periodically arranged in the circumferential direction of the damping ring.
7. The vibration damping device according to claim 6, characterized by A plurality of partitions are connected between the outer ring and the inner ring.
8. The vibration damping device according to claim 6, characterized by All the partitions are distributed in the circumferential direction of the damping ring.
9. The vibration damping device according to claim 6, characterized by The first elastic material is filled between every two adjacent partitions.
10. An electric machine characterized by The intervals of all the partitions in the circumferential direction of the damping ring are equal. The number and arrangement of the rigid cores between every two adjacent partitions are the same. A notch is arranged on the damping ring. The notch penetrates the inner and outer sides of the damping ring along the radial direction of the damping ring. The second elastic material is filled between the inner ring and the motor body and between the outer ring and the shell. The second elastic material has a different density from the first elastic material. The shell comprises a bottom shell and an upper cover. The bottom shell is provided with a first connecting part. The upper cover is provided with a second connecting part. The first connecting part and the second connecting part are detachably connected. One of the first connecting part and the second connecting part is a tenon. The other is a mortise. The tenon is connected with the mortise to connect the bottom shell and the upper cover. The upper cover is provided with a shaft hole. The shaft hole is connected between the accommodation cavity and the outside of the shell. The shaft hole is used for inserting a rotating shaft connected with the motor body. The upper cover is provided with a wire hole. The wire hole is connected between the accommodation cavity and the outside of the shell. The wire hole is used for inserting a wire connected with the motor body. The damping device is used for the motor. The damping device is used for the motor.