Anti-thermal-attenuation voice coil motor

Abstract

The utility model discloses a thermal-attenuation-resistant voice coil motor, and the motor comprises a magnetic steel support which is provided with a magnetic steel assembly and a plurality of first heat dissipation holes. The coil support is arranged opposite to the magnetic steel support, the coil support is provided with a coil framework and a plurality of second heat dissipation holes communicated with the coil framework, the coil framework is sleeved with a coil winding, and the magnetic steel assembly is movably sleeved with the coil framework in the vertical direction; and the elastic component is arranged between the magnetic steel bracket and the coil bracket and is sleeved outside the coil framework. According to the utility model, the heat generated by the coil winding in the voice coil motor can be effectively dissipated, and the problem of thermal attenuation of the leaping power of the magnetic steel and the elastic component caused by long-time high-load operation is avoided, so that the stability and long service life of the motor are kept.

Description

Technical Field

[0001] The utility model relates to the technical field of voice coil motors, in particular to a voice coil motor that is resistant to thermal attenuation. Background Art

[0002] A voice coil motor (VCM) is a special type of direct-drive motor characterized by its simple structure, compact size, high speed, and fast acceleration response. Its operating principle is that a current-carrying coil (conductor) placed within a magnetic field generates a force proportional to the current applied to the coil.

[0003] The Chinese utility model patent document with authorization publication number CN216188529U discloses a material selection vibration machine, but the material selection vibration machine uses a voice coil motor with a spring as a vibration source, which can make the device more flexible and have a smaller vibration amplitude.

[0004] However, when the spring-encased voice coil motor described above is in operation, the coil generates heat due to resistance. This heat generation increases significantly, especially under high loads and for extended periods. Because the interior of a voice coil motor is typically sealed, heat cannot be effectively dissipated, causing the internal temperature to rise rapidly. The heat power of the magnetic steel inside the motor is weakened. The rotor steel sleeve, which surrounds the coil, absorbs and accumulates heat generated by the coil. Because the sleeve is in direct contact with the spring, the heat is further transferred to the spring. High temperatures can cause changes in the spring's material properties, such as a decrease in elastic modulus and increased creep, leading to thermal decay of the spring's spring force. This not only affects the stability of the vibration source but can also shorten the life of the device. Utility Model Content

[0005] In order to overcome the problem in the prior art that the bounce force of the magnetic steel and the elastic component may be thermally attenuated when the voice coil motor is under high load and operated for a long time, the present invention provides a voice coil motor that is resistant to thermal attenuation.

[0006] The technical solution of this utility model is as follows:

[0007] A voice coil motor resistant to thermal attenuation, comprising:

[0008] A magnetic steel bracket, wherein the magnetic steel bracket is provided with a magnetic steel assembly and a plurality of first heat dissipation holes;

[0009] The coil bracket is arranged opposite to the magnetic steel bracket. The coil bracket is provided with a coil frame and a plurality of second heat dissipation holes connected to the coil frame. The coil frame is provided with a coil winding on the outer sleeve. The coil frame can be movably mounted outside the magnetic steel assembly in the vertical direction.

[0010] As a preferred solution of the present invention, it further includes an elastic component, which is arranged between the magnetic steel bracket and the coil bracket and is sleeved on the outside of the coil skeleton.

[0011] As a preferred solution of the present invention, a magnetic sleeve is also provided on the magnetic steel bracket, the magnetic steel assembly is arranged inside the magnetic steel sleeve, and the magnetic steel sleeve is connected to several of the first heat dissipation holes, the coil frame is movably mounted between the magnetic steel sleeve and the magnetic steel assembly in the vertical direction, and the elastic component is mounted on the outside of the magnetic steel sleeve and the coil frame.

[0012] As a preferred solution of the present invention, a movable cavity for vertical movement of the coil skeleton is formed between the magnetic steel sleeve and the magnetic steel assembly, and a plurality of the first heat dissipation holes are connected to the movable cavity.

[0013] As a preferred solution of the present invention, a heat dissipation groove is provided on the surface of the magnetic steel bracket away from the coil bracket, one end of the heat dissipation groove extends to an edge of the magnetic steel bracket, and the first heat dissipation hole is provided at the bottom of the heat dissipation groove.

[0014] As a preferred solution of the present invention, a first fixing block is provided at one end of the elastic component close to the magnetic steel bracket, and a second fixing block is provided at one end of the elastic component close to the coil bracket. The elastic component is fixed to the magnetic steel bracket and the coil bracket respectively through the first fixing block and the second fixing block.

[0015] As a preferred solution of the present invention, the elastic component is a spring.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. By removing the steel sleeve outside the coil winding, the heat generated by the coil winding can be dissipated in time, avoiding heat accumulation inside the steel sleeve, thereby reducing the operating temperature of the motor; due to the effective dissipation of internal heat, the thermal impact on the elastic components and magnetic steel can be reduced, avoiding the elastic component bounce force and magnetic steel thermal attenuation problems caused by long-term high-load operation, thereby maintaining the stability and long service life of the motor;

[0018] 2. By opening a first heat dissipation hole on the magnetic steel bracket that is connected to the magnetic steel sleeve, the heat generated by the coil winding inside the voice coil motor can be effectively dissipated to prevent heat accumulation inside the magnetic steel sleeve. This can reduce the thermal impact on the elastic component and the magnetic steel, and avoid the elastic component bounce force and magnetic steel thermal attenuation problems caused by long-term high-load operation, thereby maintaining the stability and long service life of the motor;

[0019] 3. By opening a second heat dissipation hole connected to the coil frame on the coil bracket, the heat generated by the coil winding can not only be dissipated to the external environment through the first heat dissipation hole, but also be dissipated to the external environment from the inside of the coil frame through the second heat dissipation hole, further accelerating the heat dissipation rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A cross-sectional view of the voice coil motor resistant to thermal attenuation in Example 1 of the present utility model;

[0022] Figure 2 This is an exploded view of the voice coil motor resistant to thermal attenuation in Example 1 of the present utility model;

[0023] Figure 3 A cross-sectional view of a voice coil motor resistant to thermal attenuation in Example 2 of the present invention;

[0024] Figure 4 This is a schematic structural diagram of a voice coil motor resistant to thermal attenuation in Example 2 of the present utility model;

[0025] Figure 5 This is a schematic structural diagram of the voice coil motor resistant to thermal attenuation in Example 2 of the present utility model from another perspective;

[0026] Figure 6 This is an exploded view of the voice coil motor resistant to thermal attenuation in Example 2 of the present utility model;

[0027] Figure 7 This is an exploded view from another perspective of the voice coil motor resistant to thermal attenuation in Example 2 of the present invention.

[0028] In the figure,

[0029] 1. Magnetic steel bracket; 11. Magnetic steel sleeve; 12. First heat dissipation hole; 13. Movable cavity; 14. Heat dissipation slot; 2. Coil bracket; 21. Coil skeleton; 22. Second heat dissipation hole; 3. Elastic component; 31. First fixing block; 32. Second fixing block; 4. Magnetic steel assembly; 5. Coil winding. DETAILED DESCRIPTION

[0030] To make the technical problems, technical solutions, and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. It should also be noted that the embodiments described below are intended only to illustrate the present invention and are not intended to limit the present invention.

[0031] It should be noted that the terms "installed," "set," "connected," and "fixed" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two elements, or interactions between two elements, unless otherwise expressly defined. The indication of orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the application is typically placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship in which the product of the application is typically placed when in use. These indications are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "first," "second," "third," and "fourth" are intended solely for descriptive purposes and should not be construed to indicate or imply relative importance or to implicitly indicate the number of technical features. "Multiple" means two or more, unless otherwise expressly defined. "Several" means one or more than one, unless otherwise clearly defined.

[0032] Example 1

[0033] See also Figure 1 、 Figure 2This embodiment provides a voice coil motor that resists thermal attenuation. The motor comprises a magnetic support 1, a coil support 2 disposed opposite the magnetic support 1, and an elastic component 3. The magnetic support 1 is provided with a magnetic assembly 4 and a plurality of first heat dissipation holes 12. The coil support 2 is provided with a coil bobbin 21 and a plurality of second heat dissipation holes 22 communicating with the coil bobbin 21. A coil winding 5 is disposed on the coil bobbin 21 and is vertically movable around the magnetic assembly 4. The elastic component 3 is disposed between the magnetic support 1 and the coil support 2 and is mounted outside the coil bobbin 21. By eliminating the steel sheathing surrounding the coil winding 5, this embodiment allows heat generated by the coil winding 5 to be dissipated promptly, preventing heat accumulation within the steel sheathing, thereby reducing the operating temperature of the motor. This effective internal heat dissipation reduces the thermal impact on the elastic component 3 and the magnetic assembly 4, preventing the spring force of the elastic component 3 and thermal attenuation of the magnetic assembly 4 caused by prolonged high-load operation, thereby maintaining the stability and longevity of the motor. In addition, a first heat dissipation hole 12 is provided on the magnetic steel support 1, and a second heat dissipation hole 22 is provided on the coil support 2, so that the heat generated by the coil winding 5 can be dissipated to the external environment through the first heat dissipation hole 12 and the second heat dissipation hole 22, further accelerating the heat dissipation rate.

[0034] Example 2

[0035] See also Figures 3 to 7 This embodiment provides a voice coil motor that is resistant to thermal attenuation, including a magnetic steel support 1, a coil support 2 arranged opposite to the magnetic steel support 1, and an elastic component 3. The magnetic steel support 1 is provided with a magnetic steel sleeve 11 and a magnetic steel assembly 4, and the magnetic steel assembly 4 is arranged inside the magnetic steel sleeve 11. The magnetic steel support 1 is provided with a plurality of first heat dissipation holes 12 connected to the magnetic steel sleeve 11; the coil support 2 is provided with a coil bobbin 21, and the coil bobbin 21 is provided with a coil winding 5. The coil bobbin 21 is movably arranged between the magnetic steel sleeve 11 and the magnetic steel assembly 4 in the vertical direction; the elastic component 3 is arranged outside the magnetic steel sleeve 11 and the coil bobbin 21. The present invention provides a plurality of first heat dissipation holes 12 on the magnetic steel bracket 1 that are in communication with the magnetic steel sleeve 11. This effectively dissipates the heat generated by the coil winding 5 inside the voice coil motor, preventing heat accumulation inside the magnetic steel sleeve 11, thereby reducing the operating temperature of the motor. Due to the effective dissipation of internal heat, the thermal impact on the elastic component 3 and the magnetic steel assembly 4 can be reduced, avoiding the problems of the elastic component 3's bounce force and the magnetic steel assembly 4's thermal attenuation caused by long-term high-load operation, thereby maintaining the stability and long service life of the motor.

[0036] See also Figure 3 、 Figure 5 、 Figure 7The coil support 2 is provided with a plurality of second heat dissipation holes 22 that are in communication with the coil bobbin 21. Since the second heat dissipation holes 22 are in communication with the coil bobbin 21, the heat generated by the coil winding 5 can be dissipated not only from the first heat dissipation holes 12 to the external environment, but also from the inside of the coil bobbin 21 through the second heat dissipation holes 22 to the external environment. This increases the surface area for heat dissipation, thereby accelerating the rate of heat dissipation. Since heat can be dissipated more quickly, the thermal impact of heat on other components within the motor (such as the elastic component 3) is reduced, helping to maintain the original performance of the elastic component 3 and avoiding the problem of thermal attenuation of the spring force caused by long-term high-temperature operation, thereby extending the overall service life of the motor.

[0037] See also Figure 3 In one embodiment, an active cavity 13 for the vertical movement of the coil skeleton 21 is formed between the magnetic sleeve 11 and the magnetic assembly 4. The active cavity 13 provides sufficient vertical movement space for the coil skeleton 21, which is the basis for the normal operation of the voice coil motor. The coil skeleton 21 can move freely in this space, thereby achieving precise control and rapid response of the motor. In addition, a number of first heat dissipation holes 12 are connected to the active cavity 13 to form an efficient heat dissipation channel. When the coil winding 5 generates heat during operation, the heat can be quickly transferred to the active cavity 13, and further dissipated to the external environment through the first heat dissipation holes 12, ensuring that the heat can be discharged quickly and effectively, thereby avoiding excessive accumulation of temperature inside the motor.

[0038] In some specific embodiments, a plurality of first heat dissipation holes 12 are evenly distributed around the periphery of the magnetic steel assembly 4. By evenly distributing the first heat dissipation holes 12, the heat generated internally can be evenly and effectively dissipated through the first heat dissipation holes 12, thereby preventing heat from being locally accumulated within the magnetic steel sleeve 11, thereby achieving a more balanced heat dissipation effect.

[0039] See also Figure 3 、 Figure 4 、 Figure 6 In one embodiment, a heat dissipation groove 14 is provided on the surface of the magnetic steel bracket 1 away from the coil bracket 2, one end of the heat dissipation groove 14 extends to a certain edge of the magnetic steel bracket 1, and the first heat dissipation hole 12 is provided at the bottom of the heat dissipation groove 14. The heat dissipation groove 14 provided above effectively avoids the problem that the first external mechanism may block the first heat dissipation hole 12 when the magnetic steel bracket 1 is connected to the first external mechanism, ensures that the first heat dissipation hole 12 is unobstructed, and ensures that the heat dissipation effect is not affected. If the surface of the magnetic steel bracket 1 away from the coil bracket 2 is in contact with the first external mechanism, the heat inside the magnetic steel sleeve 11 can be conducted along the channel of the heat dissipation groove 14 after passing through the first heat dissipation hole 12, and dissipated to the external environment at the end of the channel.

[0040] See also Figures 3 to 7 In one embodiment, a first fixing block 31 is provided at the end of the elastic component 3 near the magnetic support 1, and a second fixing block 32 is provided at the end of the elastic component 3 near the coil support 2. The elastic component 3 is secured to the magnetic support 1 and the coil support 2 via the first fixing block 31 and the second fixing block 32, respectively. The first fixing block 31 and the second fixing block 32 serve as connection points, firmly securing the elastic component 3 between the magnetic support 1 and the coil support 2. This significantly enhances the stability of the entire motor structure, enabling the motor to withstand various vibrations and shocks during operation, ensuring smooth and reliable operation.

[0041] In one embodiment, a first mounting hole is formed on the magnetic steel bracket 1. The first mounting hole cooperates with a fixing member to stably mount the magnetic steel bracket 1 on the first external mechanism.

[0042] In one embodiment, a second mounting hole is provided on the coil support 2. The second mounting hole cooperates with the fixing piece to stably mount the magnetic steel support 1 on the second external structure.

[0043] It should be noted that the combination of the magnetic steel support 1 and the magnetic steel assembly 4 can be used as either a motor stator or a motor mover, while the combination of the coil support 2 and the coil winding 5 can be used as either a motor mover or a motor stator. This is not a limitation of the present invention. Due to the optimized heat dissipation structure, whether the magnetic steel support 1 and the magnetic steel assembly 4 are used as a motor stator or a motor mover, they can effectively dissipate heat, maintaining the stability and longevity of the motor.

[0044] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to this utility model.

[0045] The above is an exemplary description of the present utility model patent in conjunction with the accompanying drawings. It is obvious that the implementation of the present utility model patent is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present utility model patent, or the concept and technical solution of the present utility model patent are directly applied to other occasions without improvement, they are all within the scope of protection of the present utility model.

Claims

1. A voice coil motor resistant to thermal attenuation, characterized in that: include: A magnetic steel bracket, wherein the magnetic steel bracket is provided with a magnetic steel assembly and a plurality of first heat dissipation holes; The coil bracket is arranged opposite to the magnetic steel bracket. The coil bracket is provided with a coil frame and a plurality of second heat dissipation holes connected to the coil frame. The coil frame is provided with a coil winding on the outer sleeve. The coil frame can be movably mounted outside the magnetic steel assembly in the vertical direction.

2. The voice coil motor with resistance to thermal attenuation according to claim 1, characterized in that: It also includes an elastic component, which is arranged between the magnetic steel bracket and the coil bracket and is sleeved on the outside of the coil frame.

3. The voice coil motor with resistance to thermal attenuation according to claim 2, characterized in that: A magnetic steel sleeve is also provided on the magnetic steel bracket, the magnetic steel assembly is arranged inside the magnetic steel sleeve, and the magnetic steel sleeve is connected to several of the first heat dissipation holes. The coil frame can be movably mounted between the magnetic steel sleeve and the magnetic steel assembly in the vertical direction, and the elastic component is mounted on the outside of the magnetic steel sleeve and the coil frame.

4. The voice coil motor with resistance to thermal attenuation according to claim 3, characterized in that: A movable cavity for vertical movement of the coil frame is formed between the magnetic steel sleeve and the magnetic steel assembly, and a plurality of the first heat dissipation holes are connected to the movable cavity.

5. The voice coil motor with resistance to thermal attenuation according to claim 3, characterized in that: A heat dissipation groove is provided on the surface of the magnetic steel bracket away from the coil bracket, one end of the heat dissipation groove extends to an edge of the magnetic steel bracket, and the first heat dissipation hole is provided at the bottom of the heat dissipation groove.

6. The voice coil motor with resistance to thermal attenuation according to claim 2, characterized in that: A first fixing block is provided at one end of the elastic component close to the magnetic steel bracket, and a second fixing block is provided at one end of the elastic component close to the coil bracket. The elastic component is fixed to the magnetic steel bracket and the coil bracket respectively through the first fixing block and the second fixing block.

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