Motor structure capable of reducing noise
By combining an integrated rotor design with a limiting device, the noise and wear problems caused by rotor axial movement in micro motors are solved, achieving the effects of noise reduction and life extension.
Patent Information
- Application Number
- CN202422899035.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-11-27
AI Technical Summary
Existing micro motors, due to the lack of restriction on the rotor center position during long-term operation, experience axial and radial movement, which generates noise and increases wear, affecting user experience and increasing manufacturing costs.
It adopts an integrated rotor design, and first and second limiting devices are respectively set at the upper and lower parts of the rotating shaft. The axial and radial movement of the rotor is restricted by the limiting devices, and the elastic element provides stable rotation. The rotating shaft and the limiting device are in contact through rolling friction or point contact.
It effectively limits rotor movement, reduces noise, extends motor life, improves user experience, and reduces manufacturing costs.
Smart Images
Figure CN223514719U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of motor technology, and in particular relates to a motor structure for reducing noise. Background Technology
[0002] Micro motors, also known as miniature electric motors, are commonly used in control systems or transmission mechanical loads.
[0003] Existing micro motors use an external power source to input current to the stator, which drives the rotor to rotate. The rotor then transmits power to the transmission mechanism. The main structure of a micro motor includes an end cover, rotor, shaft, stator, and housing. The rotor and shaft have a clearance fit, while the shaft, end cover, and housing have an interference fit. The stator and housing also have an interference fit.
[0004] However, in actual use, motors that run for extended periods will generate significant noise. Analysis reveals the reason is as follows:
[0005] 1. When the motor rotates, the center position of the motor rotor is not restricted, which causes the rotor to move axially and radially.
[0006] 2. During the lifespan of the motor, the gap between the rotor shaft hole and the shaft increases with wear, resulting in continuously increasing noise.
[0007] Specifically, the two drawbacks mentioned above refer to the following: When the motor rotor rotates under the influence of a magnetic field, due to magnetic field pulsation or poor rotor dynamic balance, and the lack of center position restriction, the rotor will experience axial and radial movement. Because the rotor shaft bore and the shaft are in a clearance fit, this axial and radial movement will cause collision noise between the rotor shaft bore and the shaft. As the motor's service life and usage time increase, both the rotor shaft bore and the shaft will experience greater wear, leading to a larger clearance between them and consequently, increased collision noise.
[0008] Unstable rotor rotation, especially when the rotor moves in the axial and radial directions, can cause abnormal noise, resulting in a poor user experience. In severe cases, it may require repair, increasing costs.
[0009] The rotor and the shaft are fitted with a clearance fit, which requires high precision in clearance control and high precision in machining and manufacturing, thus increasing manufacturing costs. Utility Model Content
[0010] To address the problems in the related technologies, this application provides a motor structure that reduces noise, thus resolving the defects mentioned in the background technology.
[0011] The technical solution is as follows:
[0012] A noise-reducing motor structure includes: a motor body; a stator fixed inside the motor body; and an integral rotor disposed within the stator, the integral rotor including a rotor body and an integrally manufactured shaft; a first limiting device disposed between the shaft and the interior of the motor body; and a second limiting device disposed between the shaft and the interior of the motor body; the first limiting device and the second limiting device are respectively disposed at the upper and lower parts of the shaft; when the integral rotor rotates, the upper part and the lower part of the shaft achieve stable rotation under the limiting of the first limiting device and the second limiting device, respectively; under the action of the first limiting device and the second limiting device, the shaft avoids radial and axial movement.
[0013] In a further improvement, the first limiting device includes: a first limiting cavity disposed within the motor body; an elastic element installed at the bottom of the first limiting cavity and generating elastic force facing the interior of the motor body; a slider assembled inside the first limiting cavity and connected to the elastic element; a limiting hole provided in the center of the side of the slider facing the interior of the motor body; and the lower part of the rotating shaft contacting the limiting hole through rolling friction.
[0014] As a further improvement, the upper end of the limiting hole is provided with a trumpet-shaped opening structure.
[0015] In a further improvement, the elastic element is one of a spring, an elastic block, or an elastic sheet.
[0016] In a further improvement, one end of the rotating shaft is a tapered portion; the tapered portion is inserted into the limiting hole, and the tapered portion contacts the edge of the opening structure in the limiting hole to achieve rolling friction contact.
[0017] A further improvement is that the distance between the end of the pivot cone and the bottom of the limiting hole is not less than one-quarter of the depth of the limiting hole.
[0018] In a further improvement, one end of the rotating shaft is a spherical part, and the bottom of the limiting hole is hemispherical; the spherical part is inserted into the limiting hole, and the spherical part and the bottom of the hemispherical structure in the limiting hole make contact through point contact.
[0019] In a further improvement, the second limiting device includes: a second limiting cavity disposed within the motor body; one end of the rotating shaft is inserted into the second limiting cavity, and the one end of the rotating shaft contacts the second limiting cavity through bottom point contact or opening edge contact, and the one end of the rotating shaft is limited by the second limiting cavity.
[0020] In a further improvement, the bottom of the second limiting cavity is hemispherical, and one end of the rotating shaft is set as a rotating shaft ball part; the rotating shaft ball part is inserted into the second limiting cavity, and the rotating shaft ball part and the bottom of the hemispherical shape are in contact through point contact.
[0021] In a further improvement, the second limiting cavity is a limiting hole, and one end of the rotating shaft is a rotating shaft cone; the rotating shaft cone is inserted into the limiting hole, and the rotating shaft cone contacts the edge of the opening of the limiting hole to achieve rolling friction contact.
[0022] Compared with existing technologies, the beneficial effects of this patented technology, which adopts the above technical solution, are as follows:
[0023] The rotor in this invention is designed and manufactured as a single unit, integrating the original rotor and shaft without any gaps. At the same time, the upper and lower parts of the shaft are reasonably limited to restrict the axial and radial movement of the rotor. Even after long-term use, the rotor movement can still be effectively limited, thereby improving the vibration and noise performance of the motor throughout its entire service life. Attached Figure Description
[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.
[0025] Figure 1 This is a schematic diagram of the external structure of this utility model;
[0026] Figure 2 yes Figure 1 AA sectional view.
[0027] Figure 3 yes Figure 2 A schematic diagram of the three-dimensional structure.
[0028] Figure 4 This is a schematic diagram of the slider in this utility model.
[0029] In the picture:
[0030] 1. Stator; 2. Motor body; 3. Rotor ball joint; 4. Second limiting cavity; 5. Integrated rotor; 6. Rotor cone joint; 7. First limiting cavity; 8. Slider; 81. Opening structure; 82. Limiting hole; 9. Transmission gear. Detailed Implementation
[0031] Preferred embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.
[0032] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.
[0033] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as first information, and similarly, second information may also be referred to as second information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0034] Example 1
[0035] like Figure 1-4 As shown, a noise-reducing motor structure includes a motor body with a stator fixed inside. The stator contains an integral rotor, which includes a rotor body and a one-piece manufactured shaft. There is no gap between the stator and the shaft, eliminating wear and tear and significantly extending the motor's lifespan and improving the user experience.
[0036] A first limiting device and a second limiting device are respectively provided between the rotating shaft and the interior of the motor body. The distribution of the first limiting device and the second limiting device can be varied. In this embodiment, the first limiting device is located in the lower part of the rotating shaft and the motor body, and the second limiting device is located in the upper part of the rotating shaft and the motor body.
[0037] The first limiting device includes a first limiting cavity disposed within the motor body; an elastic element installed at the bottom of the first limiting cavity, generating elastic force facing inward toward the motor body; and a slider assembled inside the first limiting cavity, connected to the elastic element. A limiting hole is provided in the center of the side of the slider facing inward toward the motor body, and the lower part of the rotating shaft contacts the limiting hole through rolling friction.
[0038] The upper end of the limiting hole has a flared opening structure. The elastic element is one of a spring, an elastic block, or an elastic sheet, which can continuously provide elastic force to the slider.
[0039] The lower part of the shaft is a conical section. During rotation, the side of the conical section contacts the edge of the open structure, achieving rolling friction. Rolling friction is a type of line contact, which reduces the contact area and limits the radial movement of the rotor.
[0040] The distance between the end of the tapered portion of the shaft and the bottom of the limiting hole is no less than one-quarter of the depth of the limiting hole. Over time, due to friction, the outer diameter of the tapered portion of the shaft will decrease, and the edge of the limiting hole opening will also widen due to friction. At this point, the elastic element provides elastic force, causing the slider to move upwards. This ensures that the overall position of the shaft remains unchanged; only the distance between the end of the shaft and the bottom of the limiting hole changes. This structure significantly increases the effective time of the noise reduction function, potentially even exceeding the lifespan of the motor.
[0041] The second limiting device includes a second limiting cavity, which is located inside the motor body. One end of the rotating shaft is inserted into the second limiting cavity, and the one end of the rotating shaft makes point contact with the bottom of the second limiting cavity.
[0042] Considering the actual situation, the second limiting cavity is hemispherical, and one end of the rotating shaft is set as a rotating ball part. The rotating ball part is inserted into the second limiting cavity.
[0043] The combined action of the first and second limiting devices provides limiting in four directions: up, down, left, and right, thus restricting the axial and radial movement of the rotor.
[0044] The rotor in this invention is designed and manufactured as a single unit, integrating the original rotor and shaft without any gaps. At the same time, the upper and lower parts of the shaft are reasonably limited to restrict the axial and radial movement of the rotor. Even after long-term use, the rotor movement can still be effectively limited, thereby improving the vibration and noise performance of the motor throughout its entire service life.
[0045] Example 2
[0046] Compared with Embodiment 1, the structural difference between this embodiment and Embodiment 1 lies in the interchange of the positions of the first limiting device and the second limiting device.
[0047] In Embodiment 1, the first limiting device is located at the bottom, and the second limiting device is located at the top. In Embodiment 2, the first limiting device is located at the top, and the elastic force of the elastic element pushes the slider downward to press against the upper cone portion of the rotating shaft. The second limiting device is located at the bottom.
[0048] The structures of the first and second limiting devices in Example 1 are exactly the same as those in this example.
[0049] Furthermore, considering practical applications, the upper and lower limit devices of the rotating shaft can either adopt the structure of a first limit device or both can adopt the structure of a second limit device. This is determined by the actual situation.
[0050] Other embodiments of this invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention herein. This application is intended to cover any variations, uses, or adaptations of this invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not covered by this invention. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this invention are indicated by the following claims.
[0051] It should be understood that this utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.
Claims
1. A noise-reducing motor structure, comprising: Motor body; The stator is fixed inside the motor body; Its characteristic is that it further includes: An integral rotor is disposed within the stator, the integral rotor comprising a rotor body and an integrally manufactured shaft; A first limiting device is disposed between the rotating shaft and the interior of the motor body; a second limiting device is disposed between the rotating shaft and the interior of the motor body; the first limiting device and the second limiting device are respectively disposed at the upper and lower parts of the rotating shaft, one above the other; When the integrated rotor rotates, the upper part of the shaft and the lower part of the shaft rotate stably under the limiting of the first limiting device and the second limiting device, respectively; under the action of the first limiting device and the second limiting device, the shaft avoids radial and axial movement.
2. The noise-reducing motor structure according to claim 1, characterized in that, The first limiting device includes: The first limiting cavity is located inside the motor body; An elastic element is installed at the bottom of the first limiting cavity and generates an elastic force facing the inside of the motor body; A slider is assembled inside the first limiting cavity and is connected to the elastic element; a limiting hole is provided in the center of the side of the slider facing the inside of the motor body; the lower part of the rotating shaft contacts the limiting hole by rolling friction.
3. The noise-reducing motor structure according to claim 2, characterized in that, The upper end of the limiting hole is provided with a trumpet-shaped opening structure.
4. The noise-reducing motor structure according to claim 3, characterized in that, The elastic element is one of a spring, an elastic block, or an elastic sheet.
5. The noise-reducing motor structure according to claim 4, characterized in that, One end of the rotating shaft is a tapered portion; the tapered portion is inserted into the limiting hole, and the tapered portion contacts the edge of the opening structure in the limiting hole to achieve rolling friction contact.
6. The noise-reducing motor structure according to claim 5, characterized in that, The distance between the end of the cone portion of the rotating shaft and the bottom of the limiting hole is not less than one-quarter of the depth of the limiting hole.
7. The noise-reducing motor structure according to claim 3, characterized in that, One end of the rotating shaft is a spherical part, and the bottom of the limiting hole is hemispherical; the spherical part of the rotating shaft is inserted into the limiting hole, and the spherical part of the rotating shaft contacts the bottom of the hemispherical structure in the limiting hole through point contact.
8. The noise-reducing motor structure according to claim 1, characterized in that, The second limiting device includes: The second limiting cavity is located inside the motor body; One end of the rotating shaft is inserted into the second limiting cavity, and the one end of the rotating shaft contacts the second limiting cavity through bottom point contact or opening edge contact, and the one end of the rotating shaft is limited by the second limiting cavity.
9. The noise-reducing motor structure according to claim 8, characterized in that, The bottom of the second limiting cavity is hemispherical, and one end of the rotating shaft is a rotating shaft ball part; the rotating shaft ball part is inserted into the second limiting cavity, and the rotating shaft ball part and the bottom of the hemispherical shape are in contact through point contact.
10. A noise-reducing motor structure according to claim 8, characterized in that, The second limiting cavity is a limiting hole, and one end of the rotating shaft is a rotating shaft cone. The rotating shaft cone is inserted into the limiting hole, and the rotating shaft cone contacts the edge of the opening of the limiting hole to achieve rolling friction contact.