Rotor assembly, electric machine and electric appliance
By installing damping and vibration reduction components around the outer circumference of the shaft and combining them with an anti-slip structure, the resonance noise problem under low-speed motor operation is solved, achieving a simple and efficient vibration reduction effect and improving the reliability and service life of the motor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG WELLING ELECTRIC MACHINE MFG
- Filing Date
- 2025-07-31
- Publication Date
- 2026-07-14
Smart Images
Figure CN224503002U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor technology, and in particular to a rotor assembly, a motor, and electrical equipment. Background Technology
[0002] With the development of modern industry and the improvement of people's living standards, electric motors, as a widely used power source, play an indispensable role in many fields such as household appliances, automobiles, and industrial equipment. However, during operation, especially at low speeds, electric motors are prone to natural frequency resonance within a specific frequency range, resulting in significant noise. Some products incorporate vibration damping structures on the shaft, but these structures are complex and lack reliability. Utility Model Content
[0003] The main objective of this invention is to provide a rotor assembly, a motor, and an electrical device, aiming to solve at least one of the aforementioned technical problems.
[0004] To achieve the above objectives, this utility model provides a rotor assembly for driving a load to rotate, the rotor assembly comprising:
[0005] Rotor core;
[0006] A rotating shaft is coaxially arranged with the rotor core, and the rotating shaft and the rotor core rotate synchronously.
[0007] Damping vibration dampers are sleeved on the outer circumference of the rotating shaft; and
[0008] An anti-slip structure is provided on the circumferential surface of the rotating shaft, and the damping damping element is sleeved on the outer periphery of the anti-slip structure; and / or, the damping damping element is interference-fitted with the rotating shaft.
[0009] In one embodiment, the anti-slip structure is configured as at least one of the following: a serrated structure, a knurled structure, a frosted structure, a threaded structure, and a grooved structure, provided on the circumferential surface of the rotating shaft.
[0010] In one embodiment, the rotating shaft is provided with a mounting position for mounting the load, and the mounting position is spaced apart from the damping shock absorber.
[0011] In one embodiment, a plurality of damping dampers are provided, and the plurality of damping dampers are spaced apart along the axial direction of the rotating shaft.
[0012] In one embodiment, a plurality of the damping damping elements are disposed on opposite sides of the rotor core.
[0013] In one embodiment, the rotor assembly further includes a bearing, the shaft passing through the inner ring of the bearing, and the damping damper is provided on the side of the bearing facing and / or away from the rotor core.
[0014] In one embodiment, the material of the damping damper includes either rubber or polyurethane.
[0015] In one embodiment, the damping damping member includes a flexible member and a rigid member sleeved on the outer periphery of the flexible member, the flexible member being sleeved on the outer periphery of the rotating shaft.
[0016] To achieve the above objectives, this utility model provides an electric motor, which includes the rotor assembly described above.
[0017] To achieve the above objectives, this utility model provides an electrical device, which includes the motor described above.
[0018] The technical solution of this application increases the damping ratio by fitting a damping damper around the outer circumference of the shaft, thereby improving the shaft's vibration absorption capacity and damping characteristics, and reducing vibration and noise during motor operation, especially at low speeds. Furthermore, the damping damper has a simple structure and is easy to install; it is directly fitted onto the outer circumference of the shaft without requiring large-scale modifications to the original shaft structure to achieve good vibration reduction. The damping damper does not adversely affect the mechanical strength of the shaft, effectively avoiding reliability issues such as shaft bending and fatigue fracture caused by shaft structure modifications, and improving the service life and safety performance of the rotor assembly. In addition, the spacing between the damping damper and the mounting position for the load does not affect the installation and operation of the load and reduces the adverse impact of the load on the reliability of the damping damper. Simultaneously, the anti-slip structure increases the friction between the damping damper and the shaft, preventing the damping damper from moving axially along the shaft and ensuring a reliable connection between them. In addition, the interference fit between the damping damper and the shaft can also prevent axial movement of the damping damper. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the rotor assembly of this utility model;
[0021] Figure 2 for Figure 1 A schematic diagram of the exploded structure;
[0022] Figure 3 This is a schematic diagram of another embodiment of the rotor assembly of this utility model;
[0023] Figure 4 This is a schematic diagram of another embodiment of the rotor assembly of this utility model;
[0024] Figure 5 This is a schematic diagram of another embodiment of the rotor assembly of this utility model;
[0025] Figure 6 This is a noise comparison diagram between the embodiment of the rotor assembly of this utility model and the conventional embodiment;
[0026] Figure 7 This is a schematic diagram of the structure of an embodiment of the motor of this utility model;
[0027] Figure 8 This is a schematic diagram of another embodiment of the motor of this utility model;
[0028] Figure 9 This is a schematic diagram of another embodiment of the motor of this utility model.
[0029] Explanation of icon numbers:
[0030] 1. Rotor core; 2. Shaft; 3. Damping damper; 4. Bearing; 5. Anti-slip structure; 6. Housing; 7. Load; 8. Locking nut.
[0031] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0032] 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, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the embodiments of the present utility model.
[0033] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0034] Furthermore, in the embodiments of this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of the embodiments of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0035] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.
[0036] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by the embodiments of this utility model.
[0037] As a core power component, electric motors are widely used in various electrical appliances, such as household air conditioners, fans, and air purifiers. With users increasingly demanding quiet and comfortable operation, reducing motor operating noise, especially low-frequency noise, has become a key factor in enhancing product competitiveness.
[0038] Under specific operating conditions, especially in low-speed, low-load operation, the rotor frequency of a motor may be close to the natural frequency of the motor itself or the equipment on which it is installed. This can cause low-frequency resonance, resulting in significant low-frequency resonance noise and affecting the user experience. This problem becomes even more pronounced when operating an air conditioner at its lowest fan speed, where extreme quietness is desired.
[0039] To suppress low-frequency resonance noise in motors, traditional solutions mainly involve using rubber or injection-molded rotors to increase the system's damping performance. This requires significant modifications to the original structure, resulting in high costs and potentially insufficient shaft strength. Another approach involves slotting the shaft to create a variable-diameter shaft, thereby lowering the rotor's natural frequency to avoid the resonance band. However, this reduces the structural strength of the shaft.
[0040] In view of the above, this utility model provides a rotor assembly, a motor, and an electrical device, aiming to solve at least one of the aforementioned technical problems. This utility model achieves good vibration reduction by directly fitting a damping damper onto the outer circumference of the shaft, without requiring large-scale modifications to the original shaft structure. The damping damper does not adversely affect the mechanical strength of the shaft, effectively avoiding reliability problems such as shaft bending and fatigue fracture caused by modifications to the shaft structure, and improving the service life and safety performance of the rotor assembly.
[0041] To better understand the above technical solution, the following detailed explanation is provided in conjunction with the accompanying drawings.
[0042] like Figures 1 to 2 As shown in the figure, this utility model embodiment proposes a rotor assembly for driving a load to rotate, the rotor assembly comprising:
[0043] Rotor core 1, rotating configuration;
[0044] A rotating shaft 2 is coaxially arranged with the rotor core 1, and the rotating shaft 2 and the rotor core 1 rotate synchronously. Optionally, the rotating shaft 2 can extend to one side of the rotor core 1 or to opposite sides of the rotor core 1, which is not limited here. The rotating shaft 2 can adopt a commonly used structure.
[0045] A damping damper 3 is sleeved on the outer periphery of the rotating shaft 2 to increase damping, suppress resonance, and reduce noise. Optionally, the damping damper 3 and the rotating shaft 2 are interference-fitted to prevent the damping damper 3 from moving axially along the rotating shaft 2. In one embodiment, the rotating shaft 2 is provided with a mounting position for mounting the load, which can be a mounting hole, mounting groove, etc. The mounting position is spaced apart from the damping damper 3, meaning that the damping damper 3 does not contact the load mounted at the mounting position. When the load operates, it vibrates significantly. If the load contacts the damping damper 3, it will continuously exert a force on the damping damper 3. After prolonged stress, the damping damper 3 is prone to deformation, which adversely affects reliability and thus the effectiveness of suppressing resonance noise. In this embodiment, the damping damper 3 does not contact the load mounted at the mounting position, effectively avoiding the aforementioned problems; and
[0046] An anti-slip structure 5 is provided on the circumferential surface of the rotating shaft 2, and the damping damper 3 is sleeved on the outer circumference of the anti-slip structure 5; and / or, the damping damper 3 is interference-fitted with the rotating shaft 2. It is understood that the anti-slip structure 5, located between the circumferential surface of the rotating shaft 2 and the damping damper 3, increases the friction between the damping damper 3 and the rotating shaft 2, preventing the damping damper 3 from moving axially along the rotating shaft 2, thus achieving a reliable connection between the damping damper 3 and the rotating shaft 2. Of course, the interference fit between the damping damper 3 and the rotating shaft 2 also prevents axial movement of the damping damper 3. It is understood that in this embodiment, to prevent axial movement of the damping damper 3, an anti-slip structure 5 can be provided on the rotating shaft 2, or the damping damper 3 and the rotating shaft 2 can be interference-fitted, or both an anti-slip structure 5 and an interference fit between the damping damper 3 and the rotating shaft 2 can be provided.
[0047] In this embodiment, by fitting a damping damper 3 around the outer circumference of the rotating shaft 2, the damping ratio can be increased, improving the vibration absorption capacity and damping characteristics of the rotating shaft 2, and reducing the vibration and noise of the motor during operation, especially at low speeds. Furthermore, the damping damper 3 has a simple structure, is easy to install, and has low cost. It can be directly fitted onto the outer circumference of the rotating shaft 2 without requiring large-scale modifications to the original structure of the rotating shaft 2, achieving a good vibration reduction effect. The installation of the damping damper 3 does not adversely affect the mechanical strength of the rotating shaft 2, effectively avoiding reliability problems such as shaft bending and fatigue fracture caused by structural modifications to the rotating shaft 2, and improving the service life and safety performance of the rotor assembly. In addition, the damping damper 3 is spaced apart from the mounting position for the load, which does not affect the installation and operation of the load and can also reduce the adverse impact of the load on the reliability of the damping damper 3. (See attached figure) Figure 6 Compared with traditional solutions, this approach reduces the peak noise level by 5 decibels. Furthermore, the anti-slip structure 5 increases the friction between the damping damper 3 and the rotating shaft 2, effectively securing the damping damper 3.
[0048] In one embodiment of this utility model, the anti-slip structure 5 is configured as at least one of the following structures on the circumferential surface of the rotating shaft 2: a ridged structure, a knurled structure, a frosted structure, a threaded structure, and a grooved structure. This creates regular or irregular protrusions, textures, or rough surfaces on the circumferential surface of the rotating shaft 2, increasing the contact friction and mechanical engagement force between the rotating shaft 2 and the damping damper 3, preventing the damping damper 3 from sliding or shifting along the axial direction of the rotating shaft 2. Furthermore, the ridged, knurled, or frosted structures are all simple, easy-to-process, and reliable surface treatment methods, enabling reliable engagement with the damping damper 3 without altering the original strength and stiffness of the rotating shaft 2. Of course, in other embodiments, threaded or grooved structures can also be used, which similarly increase friction and improve fixation reliability. In addition, the damping damper 3 can be positioned and fixed without the need for additional adhesives or fasteners during assembly, simplifying the assembly process, reducing manufacturing costs, and facilitating later maintenance and replacement. In one embodiment of this utility model, multiple damping vibration dampers 3 are provided, and the multiple damping vibration dampers 3 are arranged at intervals along the axial direction of the rotating shaft 2. By providing multiple damping vibration dampers 3 at different positions on the rotating shaft 2, the effective range of vibration suppression can be expanded, the overall damping effect of the rotating shaft 2 can be enhanced, thereby better absorbing the low-frequency vibration energy generated by the motor during operation and reducing resonance noise. Moreover, the multiple damping vibration dampers 3 arranged along the axial direction allow the vibration of the rotating shaft 2 during rotation to be dispersed and suppressed at multiple points, resulting in better stability and adaptability. At the same time, the multiple dispersed small-volume damping vibration dampers 3, compared with the integral large damping ring, can reduce the added mass and reduce the adverse effects on the rotor dynamic balance. Optionally, two adjacent damping vibration dampers 3 can be arranged at equal distances or at unequal distances, which is not limited here.
[0049] In one embodiment of this utility model, a plurality of damping vibration damping components 3 are disposed on opposite sides of the rotor core 1. This further reduces noise caused by low-frequency resonance, improves the smoothness and quietness of motor operation, and prevents excessive local stress caused by vibration concentration, thereby improving the structural reliability and service life of the motor.
[0050] In one embodiment of this utility model, reference is made to Figures 1 to 5 The rotor assembly also includes a bearing 4, with the rotating shaft 2 passing through the inner ring of the bearing 4, providing stable rotational support for the shaft 2. The bearing 4 has a damping damping element 3 on its side facing and / or away from the rotor core 1, effectively suppressing resonance and reducing noise. Optionally, multiple bearings 4 can be provided, spaced apart, to improve the reliability of the support.
[0051] In one embodiment of this utility model, the damping damper 3 is made of either rubber or polyurethane. Specifically, these materials all possess excellent elasticity and internal damping properties, effectively absorbing the vibration energy generated by the motor during operation and reducing noise problems caused by low-frequency resonance. In other words, the damping damper 3 in this embodiment is made of a high-damping material.
[0052] In one embodiment of this utility model, the damping vibration damping component 3 includes a flexible component and a rigid component sleeved on the outer periphery of the flexible component, wherein the flexible component is sleeved on the outer periphery of the rotating shaft 2. This allows for better suppression of low-frequency vibrations of the rotating shaft. Specifically, the flexible component is made of any one of rubber or polyurethane, i.e., the flexible component is a high-damping material; the rigid component is made of any one of metals such as iron, stainless steel, or aluminum.
[0053] To achieve the above objectives, this utility model provides an electric motor, which includes the rotor assembly described above. Specifically, the specific structure of the rotor assembly is as described in the above embodiments. Since this motor adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated further here.
[0054] Reference Figure 7 and Figure 8 In one embodiment of the present invention, the motor further includes a housing 6, and the damping shock absorber 3 is disposed inside the housing 6, or may be disposed outside the housing 6, which is not limited here.
[0055] Reference Figure 9 In another embodiment, the shaft 2 has a thread at one end located outside the housing 6, and the damping damper 3 is fitted onto the thread. A portion of the thread is covered by the damping damper 3, and the other end of the thread is used to connect to the locking nut 8. The mounting position is equipped with a load 7, and the damping damper 3 is located between the locking nut 8 and the load 7. The locking nut 8 abuts the damping damper 3 against the load 7 to further restrict the axial movement of the damping damper 3.
[0056] To achieve the above objectives, this utility model provides an electrical device, which includes the motor described above. Specifically, the specific structure of the motor is as described in the above embodiments. Since this electrical device adopts all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated further here. Optionally, the electrical device can be an air conditioner, electric fan, washing machine, refrigerator, range hood, vacuum cleaner, etc., and is not limited thereto.
[0057] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model embodiments. Any equivalent structural transformations made under the technical concept of the present utility model using the description and drawings of the present utility model embodiments, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model embodiments.
Claims
1. A rotor assembly for driving a load to rotate, characterized in that, The rotor assembly includes: Rotor core; A rotating shaft is coaxially arranged with the rotor core, and the rotating shaft and the rotor core rotate synchronously. Damping vibration dampers are sleeved on the outer circumference of the rotating shaft; and An anti-slip structure is provided on the circumferential surface of the rotating shaft, and the damping damping element is sleeved on the outer periphery of the anti-slip structure; and / or, the damping damping element is interference-fitted with the rotating shaft.
2. The rotor assembly as claimed in claim 1, characterized in that, The anti-slip structure is configured as at least one of the following on the circumference of the rotating shaft: a serrated structure, a knurled structure, a frosted structure, a threaded structure, and a grooved structure.
3. The rotor assembly as claimed in claim 1, characterized in that, The damping damper is provided in multiple parts, and the multiple damping dampers are arranged at intervals along the axial direction of the rotating shaft.
4. The rotor assembly as claimed in claim 3, characterized in that, Multiple damping damping components are disposed on opposite sides of the rotor core.
5. The rotor assembly as claimed in claim 4, characterized in that, The rotor assembly also includes a bearing, the shaft passes through the inner ring of the bearing, and the damping damping element is provided on the side of the bearing facing and / or away from the rotor core.
6. The rotor assembly as claimed in claim 1, characterized in that, The rotating shaft is provided with a mounting position for mounting the load, and the mounting position is spaced apart from the damping shock absorber.
7. The rotor assembly as claimed in any one of claims 1 to 6, characterized in that, The material of the damping shock absorber includes either rubber or polyurethane.
8. The rotor assembly as claimed in any one of claims 1 to 6, characterized in that, The damping and vibration reduction component includes a flexible component and a rigid component sleeved on the outer periphery of the flexible component, wherein the flexible component is sleeved on the outer periphery of the rotating shaft.
9. An electric motor, characterized in that, The motor includes a rotor assembly as described in any one of claims 1 to 8.
10. An electrical appliance, characterized in that, The electrical equipment includes the motor as described in claim 9.