A self-positioning voice coil motor and large-stroke double-drive motor

Abstract

The application provides a self-positioning voice coil motor and a large-stroke double-drive motor, which comprises a shell, the shell is hollow, a first through hole is formed in one side of the shell, an output shaft, one end of the output shaft extends into the shell through the first through hole, the output shaft is in sliding connection with the shell, a blocking portion is protruded on the side wall of the output shaft, and the blocking portion is located outside the shell, a stator winding, the outer side of the stator winding is fixed to the inner wall of the shell, a magnet, the magnet is fixed to one end of the output shaft extending into the shell, and the magnet is accommodated in the stator winding; when the stator winding is electrified, the magnet drives the output shaft to extend or retract along the axial direction of the output shaft, the blocking portion limits the retraction of the output shaft when the blocking portion abuts against the outer wall of the shell, and the magnet limits the extension of the output shaft when the side of the magnet facing the output shaft abuts against the inner wall of the shell. The self-positioning voice coil motor does not need a feedback device to determine the position of the output shaft, can simplify the positioning mode of the voice coil motor, and reduce the cost of the voice coil motor.

Description

Technical Field

[0001] This application relates to the field of motor technology, specifically to a self-positioning voice coil motor and a long-stroke dual-drive motor. Background Technology

[0002] A voice coil motor is a special type of linear drive motor. It features simple structure, small size, high speed, high acceleration, and fast response. Currently, voice coil motors require a position feedback device, typically a linear encoder or a displacement sensor, along with a servo driver to achieve servo control. However, this complicates the motor positioning process, drastically increases costs, and hinders large-scale application.

[0003] In other words, the existing technology for positioning voice coil motors is complex and costly. Summary of the Invention

[0004] This application provides a self-positioning voice coil motor, which aims to solve the problems of complex positioning methods and high costs in the existing voice coil motor technology.

[0005] To address the above technical problems, this application provides a self-positioning voice coil motor, the self-positioning voice coil motor comprising:

[0006] The outer shell is hollow, and a first through hole is provided on one side of the outer shell;

[0007] An output shaft, one end of which extends into the housing through the first through hole, is slidably connected to the housing, and a blocking part protrudes from the side wall of the output shaft, the blocking part being located outside the housing;

[0008] Stator winding, the outer side of which is fixed to the inner wall of the housing;

[0009] A magnet, which is fixed to one end of the output shaft that extends into the housing, and is housed within the stator winding;

[0010] When the stator winding is energized, it drives the magnet to extend or retract the output shaft along the axial direction of the output shaft. When the blocking part abuts against the outer wall of the housing, it restricts the retraction of the output shaft. When the magnet abuts against the inner wall of the housing on the side facing the output shaft, it restricts the extension of the output shaft.

[0011] Optionally, the blocking part is provided with a second through hole, the inner wall of the second through hole is provided with threads, the side wall of the output shaft is provided with threads, the output shaft passes through the second through hole and is threadedly connected to the blocking part, and the blocking part rotates relative to the output shaft to adjust the distance between the blocking part and the magnet.

[0012] Optionally, the output shaft includes a first shaft and a second shaft arranged coaxially. One end of the first shaft extends into the housing through the first through hole. The first shaft is slidably connected to the housing. The magnet is fixed to the end of the first shaft that extends into the housing. The other end of the first shaft is connected to one end of the second shaft. The other end of the second shaft is used to connect to the drive component. The second shaft passes through the second through hole and is threadedly connected to the blocking part.

[0013] Optionally, one end of the first shaft is hollow, and one end of the second shaft extends into one end of the first shaft and is threadedly connected to the first shaft. The first shaft rotates relative to the second shaft to adjust the distance between the blocking part and the magnet.

[0014] Optionally, the blocking part is provided with a third through hole, the second through hole communicates with the third through hole, the third through hole is located on the side of the second through hole facing the magnet, and the diameter of the third through hole is not less than the outer diameter of the first shaft.

[0015] Optionally, a locking nut is also fitted on the second shaft, the locking nut is threaded to the second shaft, the locking nut is located on the side of the blocking part away from the magnet, and the locking nut abuts against the blocking part.

[0016] Optionally, the housing includes a hollow shell and a cover plate. The shell has an opening on one side, and the cover plate blocks the opening. The cover plate is detachably connected to the shell, and the cover plate has the first through hole. When the blocking part abuts against the side of the cover plate away from the magnet, it restricts the retraction of the output shaft. When the magnet abuts against the side of the cover plate facing the magnet, it restricts the extension of the output shaft.

[0017] Optionally, the thickness of the cover plate is greater than the thickness of the sidewall of the housing.

[0018] To solve the above technical problems, this application provides a long-stroke dual-drive motor, which includes two linear drive devices. The housings of the two linear drive devices are connected to each other, and the output shafts of the two linear drive devices are located on the same straight line. One of the two linear drive devices is a self-positioning voice coil motor as described in any one of the first aspects.

[0019] Optionally, both linear drive devices are self-positioning voice coil motors as described in any one of the first aspects.

[0020] This application provides a self-positioning voice coil motor, comprising: a hollow housing with a first through hole on one side; an output shaft, one end of which extends into the housing through the first through hole and is slidably connected to the housing; a blocking portion protruding from the side wall of the output shaft, the blocking portion being located outside the housing; a stator winding, the outer side of which is fixed to the inner wall of the housing; and a magnet fixed to the end of the output shaft extending into the housing, the magnet being housed within the stator winding. When the stator winding is energized, it drives the magnet to extend or retract the output shaft along its axial direction. The blocking portion restricts the retraction of the output shaft when it abuts against the outer wall of the housing, and restricts the extension of the output shaft when the side of the magnet facing the output shaft abuts against the inner wall of the housing. This self-positioning voice coil motor uses a blocking portion on the output shaft, utilizing the physical limitation of the blocking portion to restrict the retraction of the output shaft, and utilizing the physical limitation of the inner wall of the housing to restrict the extension of the output shaft. Positioning of the blocking portion relies on the blocking portion and the housing, eliminating the need for feedback equipment to determine the position of the output shaft, thus simplifying the positioning method of the voice coil motor and reducing its cost. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a self-positioning voice coil motor provided in this application.

[0023] Figure 2 This is a cross-sectional structural schematic diagram of an embodiment of a self-positioning voice coil motor provided in this application;

[0024] Figure 3 This is a schematic diagram of the overall structure of the blocking part in an embodiment of the self-positioning voice coil motor provided in this application;

[0025] Figure 4 This is a cross-sectional structural diagram of the blocking part in an embodiment of the self-positioning voice coil motor provided in this application;

[0026] Figure 5 This is a schematic diagram of the overall structure of an embodiment of a large-stroke dual-drive motor provided in this application. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0030] This application provides a self-positioning voice coil motor and a long-stroke dual-drive motor. Detailed description follows.

[0031] First, this application provides a self-positioning voice coil motor, which includes: a housing, the housing being hollow, and a first through hole on one side of the housing; an output shaft, one end of which extends into the housing through the first through hole, the output shaft being slidably connected to the housing, and a blocking portion protruding from the side wall of the output shaft, the blocking portion being located outside the housing; a stator winding, the outer side of which is fixed to the inner wall of the housing; and a magnet, which is fixed to the end of the output shaft extending into the housing and housed within the stator winding; when the stator winding is energized, it drives the magnet to extend or retract the output shaft along the axial direction of the output shaft, the blocking portion restricting the retraction of the output shaft when it abuts against the outer wall of the housing, and restricting the extension of the output shaft when the side of the magnet facing the output shaft abuts against the inner wall of the housing.

[0032] See Figures 1 to 4 In this embodiment, the self-positioning voice coil motor 10 includes a housing 11, an output shaft 12, a stator winding 114, and a magnet 123. The housing 11 is hollow, and a first through hole 113 is provided on one side of the housing 11. One end of the output shaft 12 extends into the housing 11 through the first through hole 113, and the output shaft 12 is slidably connected to the housing 11. A blocking part 13 protrudes from the side wall of the output shaft 12 and is located outside the housing 11. The outer side of the stator winding 114 is fixed to the inner wall of the housing 11. The magnet 123 is fixed to the end of the output shaft 12 that extends into the housing 11, and the magnet 123 is housed within the stator winding 114. When the stator winding 114 is energized, it drives the magnet 123 to extend or retract along the axial direction of the output shaft 12. When the blocking part 13 abuts against the outer wall of the housing 11, it restricts the retraction of the output shaft 12. When the side of the magnet 123 facing the output shaft 12 abuts against the inner wall of the housing 11, it restricts the extension of the output shaft 12. By applying current in different directions to the stator winding 114, the extension or retraction of the output shaft 12 can be controlled. The self-positioning voice coil motor 10 of this application has a blocking part 13 on the output shaft 12. The physical limitation of the blocking part 13 restricts the retraction of the output shaft 12, and the physical limitation of the inner wall of the housing 11 restricts the extension of the output shaft 12. The blocking part 13 is positioned by the blocking part 13 and the housing 11, eliminating the need for feedback equipment to determine the position of the output shaft 12. This simplifies the positioning method of the voice coil motor and reduces its cost.

[0033] The stator winding 114 refers to the winding installed on the stator, that is, the copper wire wound on the stator. In this embodiment, the outer casing 11 is the stator, and the stator winding 114 is installed on the outer casing 11. Specifically, the stator winding 114 is wound on the inner wall of the outer casing 11. The stator winding 114 can be a concentrated winding or a distributed winding, depending on the specific situation. A winding is a general term for a phase or an entire electromagnetic circuit composed of multiple coils or coil groups. Motors can be divided into concentrated and distributed types according to the shape of the coil winding and the embedding wiring method. Concentrated windings are relatively simple to wind and embed, but have lower efficiency and poorer operating performance. Most current AC motor stators use distributed windings. Depending on the different models, types, and coil embedding process conditions, motors are designed with different winding types and specifications.

[0034] Magnet 123 is a permanent magnet, and the material of magnet 123 can be any of hard magnets, iron boron, and copper oxide.

[0035] In this embodiment, the outer casing 11 includes a hollow casing 112 and a cover plate 111. An opening 15 is provided on one side of the casing 112, and the cover plate 111 seals the opening 15. The cover plate 111 is detachably connected to the casing 112, and a first through hole 113 is provided on the cover plate 111. When the blocking part 13 abuts against the side of the cover plate 111 away from the magnet 123, it restricts the retraction of the output shaft 12. When the magnet 123 abuts against the side of the cover plate 111 facing the magnet 123, it restricts the extension of the output shaft 12. Specifically, the cover plate 111 can be fixed to the outer casing 11 by means of threaded connection, snap-fit ​​connection, etc. Since the blocking part 13 collides with the cover plate 111 when it acts as a limiting element, and the magnet 123 and the cover plate 111 also collide, the cover plate 111 is easily damaged. The detachable connection between the cover plate 111 and the casing 112 facilitates replacement of the cover plate 111 and reduces the maintenance cost of the self-positioning voice coil motor 10.

[0036] Optionally, the thickness of the cover plate 111 is greater than the side wall thickness of the housing 112. Since the cover plate 111 is easily damaged, while the housing 112 is not subject to impact, the thickness of the cover plate 111 is greater than the side wall thickness of the housing 112, which can reinforce the stress-bearing parts of the housing 11 and make the housing 11 more reasonably designed.

[0037] In one specific embodiment, the housing 112 is a cylinder, the hollow cavity inside the housing 112 is a cylinder, and the magnet 123 is a cylinder. The cross-sectional area of ​​the magnet 123 is larger than the cross-sectional area of ​​the first through hole 113. In other embodiments, the shapes of the housing 112 and the magnet 123 can be set according to specific circumstances, for example, a quadrangular prism, a triangular prism, etc.

[0038] In this embodiment, the blocking part 13 is provided with a second through hole 131, the inner wall of the second through hole 131 is threaded, and the side wall of the output shaft is threaded. The output shaft 12 passes through the second through hole 131 and is threadedly connected to the blocking part 13. The blocking part 13 rotates relative to the output shaft 12 to adjust the distance between the blocking part 13 and the magnet 123. By rotating the blocking part 13, the distance between the blocking part 13 and the magnet 123 can be adjusted, thereby adjusting the extension and retraction length of the output shaft 12 to meet different needs.

[0039] In this embodiment, the output shaft 12 includes a first shaft 121 and a second shaft 122 coaxially arranged. One end of the first shaft 121 extends into the housing 11 through a first through hole 113, and the first shaft 121 is slidably connected to the housing 11. A magnet 123 is fixed to the end of the first shaft 121 extending into the housing 11. The other end of the first shaft 121 is connected to one end of the second shaft 122, and the other end of the second shaft 122 is used to connect to the driven component. The second shaft 122 passes through a second through hole 131 and is threadedly connected to the blocking part 13. The first shaft 121 and the second shaft 122 are detachably connected, allowing for easy replacement of different second shafts 122 as needed to connect different driven components. The cross-sectional area of ​​the first shaft 121 is equal to the cross-sectional area of ​​the first through hole 113, which prevents the magnet 123 from colliding with the stator winding 114 due to shaking during the extension and retraction of the first shaft 121. The cross-section of the first through hole 113 can be circular, elliptical, triangular, or rectangular. Preferably, the first through hole 113 can be triangular, rectangular, or the like, to prevent the first shaft 121 from rotating within the first through hole 113.

[0040] In this embodiment, one end of the first shaft 121 is hollow, and one end of the second shaft 122 extends into one end of the first shaft 121 and is threadedly connected to the first shaft 121. The first shaft 121 rotates relative to the second shaft 122 to adjust the distance between the blocking part 13 and the magnet 123. The rotatability of the first shaft 121 relative to the second shaft 122 allows for further adjustment of the extension length of the output shaft 12, which further facilitates the adjustment of the extension length of the self-positioning voice coil motor 10.

[0041] In this embodiment, the blocking part 13 is provided with a third through hole 132, which communicates with the second through hole 131. The third through hole 132 is located on the side of the second through hole 131 facing the magnet 123, and the diameter of the third through hole 132 is not less than the outer diameter of the first shaft 121. The outer contour of the blocking part 13 is a hexagonal prism, and the second through hole 131 and the third through hole 132 are circular holes. The radius of the circumscribed circle of the blocking part 13 is greater than the radius of the first through hole 113. Of course, the outer contour of the blocking part 13 can also be a cylinder or other shapes, depending on the specific situation. The diameter of the third through hole 132 is not less than the outer diameter of the first shaft 121. When the first shaft 121 is rotated relative to the second shaft 122, the second shaft 122 can be adjusted to extend into the third through hole 132, thereby increasing the telescoping range of the output shaft 12.

[0042] In this embodiment, a locking nut 14 is also fitted onto the second shaft 122. The locking nut 14 is threadedly connected to the second shaft 122 and is located on the side of the blocking part 13 away from the magnet 123. The locking nut 14 abuts against the blocking part 13. The locking nut is a type of nut widely used in industries such as machinery. Its working principle is based on the self-locking effect achieved through friction between the nut and the bolt. After adjusting the blocking part 13 to the desired position, the locking nut 14 is tightened, causing friction between the locking nut 14 and the side of the blocking part 13 away from the magnet 123, thus preventing the blocking part 13 from loosening during the operation of the self-positioning voice coil motor 10.

[0043] For further details, please refer to [link / reference]. Figure 5 This application provides a long-stroke dual-drive motor 20, which includes two linear drive devices. The housings of the two linear drive devices are connected to each other, and the output shafts of the two linear drive devices are located on the same straight line. Both linear drive devices are self-positioning voice coil motors 10 of any one of the previous embodiments.

[0044] Preferably, the housings 112 of the two self-positioning voice coil motors 10 can be integrally molded to improve the overall integrity of the long-stroke dual drive motor 20.

[0045] The housings 112 of the two self-positioning voice coil motors 10 are connected to each other. Each self-positioning voice coil motor 10 can be positioned in two positions, and the long-stroke dual drive motor 20 can move at four positions, thus enabling the long-stroke dual drive motor 20 to provide a large lifting and contraction stroke.

[0046] In other embodiments, one of the two linear drive devices is a self-positioning voice coil motor 10 as described above, and the other of the two linear drive devices is a linear drive device of other types of linear reciprocating drive. For example, the other of the two linear drive devices is a cylinder, a hydraulic cylinder, a conventional voice coil motor, etc. A cylinder is a cylindrical metal component that guides a piston to perform linear reciprocating motion within the cylinder. Air in an engine cylinder converts thermal energy into mechanical energy through expansion; gas in a compressor cylinder is compressed by a piston to increase its pressure. A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion. It has a simple structure and reliable operation. When used to achieve reciprocating motion, a reduction gear can be eliminated, and there is no transmission backlash, resulting in smooth movement. Therefore, it is widely used in the hydraulic systems of various machines.

[0047] This application provides a self-positioning voice coil motor and a long-stroke dual-drive motor. The self-positioning voice coil motor includes: a hollow housing with a first through hole on one side; an output shaft, one end of which extends into the housing through the first through hole and is slidably connected to the housing; a blocking portion protruding from the side wall of the output shaft, located outside the housing; a stator winding, the outer side of which is fixed to the inner wall of the housing; and a magnet fixed to the end of the output shaft extending into the housing, housed within the stator winding. When the stator winding is energized, it drives the magnet to extend or retract the output shaft axially. The blocking portion restricts the retraction of the output shaft when it abuts against the outer wall of the housing, and restricts the extension of the output shaft when the side of the magnet facing the output shaft abuts against the inner wall of the housing. This self-positioning voice coil motor eliminates the need for a feedback device to determine the position of the output shaft, simplifying the positioning method and reducing the cost of the voice coil motor.

[0048] The foregoing has provided a detailed description of a self-positioning voice coil motor and a large-stroke dual-drive motor provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A self-positioning voice coil motor, characterized in that, The self-positioning voice coil motor includes: The outer shell is hollow, and a first through hole is provided on one side of the outer shell; An output shaft, one end of which extends into the housing through the first through hole, is slidably connected to the housing, and a blocking part protrudes from the side wall of the output shaft, the blocking part being located outside the housing; Stator winding, the outer side of which is fixed to the inner wall of the housing; A magnet, which is fixed to one end of the output shaft that extends into the housing, and is housed within the stator winding; When the stator winding is energized, it drives the magnet to extend or retract the output shaft along the axial direction of the output shaft. When the blocking part abuts against the outer wall of the housing, it restricts the retraction of the output shaft. When the magnet abuts against the inner wall of the housing on the side facing the output shaft, it restricts the extension of the output shaft. The output shaft includes a first shaft and a second shaft arranged coaxially. One end of the first shaft is hollow, and one end of the second shaft extends into one end of the first shaft and is threadedly connected to the first shaft. The first shaft rotates relative to the second shaft to adjust the distance between the blocking part and the magnet.

2. The self-positioning voice coil motor as described in claim 1, characterized in that, The blocking part is provided with a second through hole, the inner wall of the second through hole is provided with threads, the side wall of the output shaft is provided with threads, the output shaft passes through the second through hole and is threadedly connected to the blocking part, and the blocking part rotates relative to the output shaft to adjust the distance of the blocking part relative to the magnet.

3. The self-positioning voice coil motor as described in claim 2, characterized in that, One end of the first shaft extends into the housing through the first through hole. The first shaft is slidably connected to the housing. The magnet is fixed to the end of the first shaft that extends into the housing. The other end of the first shaft is connected to one end of the second shaft. The other end of the second shaft is used to connect to the drive component. The second shaft passes through the second through hole and is threadedly connected to the blocking part.

4. The self-positioning voice coil motor as described in claim 2 or 3, characterized in that, The blocking part is provided with a third through hole, and the second through hole communicates with the third through hole. The third through hole is located on the side of the second through hole facing the magnet, and the diameter of the third through hole is not less than the outer diameter of the first shaft.

5. The self-positioning voice coil motor as described in claim 3, characterized in that, The second shaft is also fitted with a locking nut, which is threadedly connected to the second shaft. The locking nut is located on the side of the blocking part away from the magnet and abuts against the blocking part.

6. The self-positioning voice coil motor as described in any one of claims 1-3, characterized in that, The housing includes a hollow shell and a cover plate. The shell has an opening on one side, and the cover plate blocks the opening. The cover plate is detachably connected to the shell, and the cover plate has a first through hole. When the blocking part abuts against the side of the cover plate away from the magnet, it restricts the retraction of the output shaft. When the side of the magnet facing the output shaft abuts against the side of the cover plate facing the magnet, it restricts the extension of the output shaft.

7. The self-positioning voice coil motor as described in claim 6, characterized in that, The thickness of the cover plate is greater than the thickness of the side wall of the housing.

8. A long-stroke dual-drive motor, characterized in that, The long-stroke dual-drive motor includes two linear drive devices, the housings of the two linear drive devices are connected to each other, the output shafts of the two linear drive devices are located on the same straight line, and one of the two linear drive devices is a self-positioning voice coil motor as described in any one of claims 1-7.

9. A long-stroke dual-drive motor, characterized in that, The long-stroke dual-drive motor includes two linear drive devices, the housings of the two linear drive devices are connected to each other, the output shafts of the two linear drive devices are located on the same straight line, and the two linear drive devices are self-positioning voice coil motors as described in any one of claims 1-7.

Images