Double-magnet miniature vibration device

Abstract

A double-magnet miniature vibration device comprises a central shaft, a stator assembly and a rotor assembly, the rotor assembly and the central shaft are coaxially connected and can rotate together, the stator assembly surrounds the rotor assembly, a first magnet and a second magnet which are symmetrically distributed along the central shaft are arranged on the rotor assembly, and the first magnet and the second magnet are arranged on the central shaft. The first magnet and the second magnet extend in the direction parallel to the center shaft, N magnetic poles and S magnetic poles of the first magnet and the second magnet are distributed in the first direction X, and the first direction X is different from the axial direction and the radial direction of the center shaft. According to the double-magnet miniature vibration device, the first magnet and the second magnet are symmetrically arranged on the rotor assembly, and the whole structure of the rotor assembly is smaller, so that the size of the whole structure is smaller, and the miniaturization of the structure is facilitated. The double-magnet miniature vibration device is simple in structure, light in weight, small in current, simple in assembly process, low in cost, high in practicability and suitable for being vigorously popularized.

Description

Technical Field

[0001] The utility model relates to a micro-vibration device, in particular to a double-magnet micro-vibration device. Background Art

[0002] As is well known, traditional vibration motors utilize a set of adjustable eccentric weights mounted on either end of the iron core rotor shaft, utilizing the centrifugal force generated by the high-speed rotation of the shaft and eccentric weights to generate an excitation force. Vibration motors have a wide frequency range, and mechanical noise can only be reduced by properly matching the excitation force with the power. Due to their eccentric structure, their amplitude is uneven, their vibration frequency is unstable, and they are difficult to miniaturize. Therefore, to meet diverse application requirements, a vibration device has been developed that generates a magnetic field using alternating current to produce small-amplitude, high-frequency rotation of the rotor. This is exemplified by the patented motor previously filed by the present applicant, application number 2015100566771. This motor structure produces high-frequency, small-amplitude vibrations with a high vibration frequency, making it suitable for a wide range of applications. However, its structure is not conducive to further reduction in product size and miniaturization. Utility Model Content

[0003] The utility model aims to solve the above problems and provides a dual-magnet micro-vibration device.

[0004] To solve the above problems, the present invention provides a dual-magnet micro-vibration device, characterized in that it includes a central axis, a stator assembly and a rotor assembly, the rotor assembly is coaxially connected to the central axis and can rotate together, the stator assembly is surrounded by the rotor assembly, and a first magnet and a second magnet are symmetrically distributed along the central axis are provided on the rotor assembly, the first magnet and the second magnet are extended in a direction parallel to the central axis, and the N poles and S poles of the first magnet and the second magnet are distributed along a first direction X, and the first direction X is different from the axial direction of the central axis and the connecting direction of the first magnet and the second magnet.

[0005] Furthermore, the first direction X is perpendicular to the axial direction of the central axis and the direction of the center line connecting the central axis, the first magnet, and the second magnet.

[0006] Furthermore, the rotor assembly includes a rotor core, a central axis hole is provided on the rotor core, and an inwardly concave mounting groove is provided on two opposite sides of the rotor core. The mounting grooves are symmetrically distributed relative to the central axis, and the first magnet and the second magnet are respectively embedded in the mounting grooves.

[0007] Furthermore, the two ends of the installation groove along the axial direction are in a shape of one end being closed and the other end being open.

[0008] Furthermore, the rotor core is formed by a plurality of silicon steel sheets or stacked silicon steel sheets.

[0009] Furthermore, a socket is provided at the other end of the rotor core opposite to the central axis hole, and a spring piece is connected in the socket. The spring piece is extended along the axial direction of the central axis.

[0010] Furthermore, it also includes a housing and an end cover that are connected in abutment with each other, and the other end of the elastic sheet is inserted into the end cover.

[0011] Furthermore, the spring piece is in a sheet shape.

[0012] Furthermore, the stator assembly includes a stator core and a coil, the stator core includes a cylindrical main body and a magnetic shoe protruding from the inner wall of the main body, the magnetic shoe is symmetrically arranged relative to the central axis, the magnetic shoe includes a neck and a head, the neck is connected between the main body and the head, and the two ends of the head extend symmetrically from both sides of the neck along the first direction X to form a T-shaped structure.

[0013] Furthermore, the coil is sleeved on the neck, and the end of the head facing away from the neck is a plane, which faces the first magnet and the second magnet, and the size of the plane of the head in the first direction X is larger than the size of the first magnet and the second magnet in the first direction X, and the size of the neck in the first direction X is smaller than the size of the first magnet and the second magnet in the first direction X.

[0014] The beneficial contribution of the present invention lies in its effective resolution of the aforementioned problems. The dual-magnet micro-vibration device of the present invention has a first magnet and a second magnet symmetrically arranged on a rotor assembly, resulting in a smaller overall rotor assembly, thereby enabling a smaller overall size and facilitating structural miniaturization. The dual-magnet micro-vibration device of the present invention has a simple structure, light weight, low current draw, a simple assembly process, and low cost. It is highly practical and should be widely promoted. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] Figure 2 It is a schematic diagram of the structural decomposition of the present utility model.

[0017] Figure 3 It is a cross-sectional schematic diagram of the present utility model.

[0018] Figure 4 It is a longitudinal sectional schematic diagram of the present utility model.

[0019] Figure identification: central axis 10, stator assembly 20, stator core 21, main body 211, magnetic shoe 212, neck 2121, head 2122, coil 22, insulating frame 23, rotor assembly 30, first magnet 31, second magnet 32, rotor core 33, central axis hole 331, mounting groove 332, outer shell 40, housing 41, end cover 42, spring clip 50, bearing 60, first direction X. DETAILED DESCRIPTION

[0020] The following examples are provided to further explain and supplement the present invention and do not constitute any limitation to the present invention.

[0021] like Figures 1 to 4 As shown, the dual-magnet micro-vibration device of the present invention includes a central shaft 10, a stator assembly 20, a rotor assembly 30, and a housing 40. The stator assembly 20 is fixedly mounted in the housing 40. The central shaft 10 and the rotor assembly 30 are coaxially connected and can rotate together. The rotor assembly 30 is mounted in the housing 40 and surrounded by the stator assembly 20. The central shaft 10 is mostly located in the housing 40, with at least one end extending outside the housing 40 for outputting high-frequency vibrations.

[0022] The main points of the present invention are that a first magnet 31 and a second magnet 32 ​​are symmetrically distributed along the central axis 10, provided on the rotor assembly 30. The first magnet 31 and the second magnet 32 ​​are extended in a direction parallel to the central axis 10, and the N poles and S poles of the first magnet 31 and the second magnet 32 ​​are distributed along a first direction X. The first direction X is a direction different from the axial and radial directions of the central axis 10. Preferably, the first direction X is perpendicular to the axial and radial directions of the central axis 10. The radial direction of the central axis 10 referred to here refers to the radial direction along the line connecting the first magnet 31 and the second magnet 32, and more specifically refers to the direction of the line connecting the centers of the first magnet 31, the second magnet 32 ​​and the central axis 10.

[0023] Furthermore, the rotor assembly 30 includes a rotor core 33 , the first magnet 31 , and the second magnet 32 ​​.

[0024] The rotor core 33 is provided with a central shaft hole 331 for mounting the central shaft 10. One end of the central shaft 10 is inserted into the rotor core 33 for co-rotation. The central shaft hole 331 can be cylindrical or non-cylindrical. Preferably, it is a cylindrical hole. The central shaft 10 and the rotor core 33 can be connected by an interference fit or by a retaining structure to achieve co-rotation. The connection method between the central shaft 10 and the rotor core 33 is not limited, as long as they can achieve co-rotation.

[0025] Preferably, the central axis hole 331 is a blind hole. In other embodiments, the central axis hole 331 may also be a through hole.

[0026] A concave mounting slot 332 is provided on opposite sides of the rotor core 33 for mounting the first and second magnets 31 and 32. The mounting slots 332 are symmetrically arranged relative to the central axis 10 and are elongated slots extending axially along the central axis 10. The first and second magnets 31 and 32 are respectively embedded in the mounting slots 332 and are symmetrically arranged relative to the central axis 10.

[0027] In this embodiment, the mounting groove 332 is a rectangular groove, and the first magnet 31 and the second magnet 32 ​​are rectangular block magnets. When they are embedded in the mounting groove 332, the surfaces of the first magnet and the second magnet 32 ​​slightly protrude from the surface of the rotor core 33.

[0028] To enhance the magnetic effect, the rotor core 33 is formed by silicon steel sheets or stacked silicon steel sheets, and has a rectangular block structure as a whole. The rectangular block structure means that the projection of its outer contour is a rectangle.

[0029] Furthermore, the mounting groove 332 is a groove structure with one end closed and the other end open, with one end in axial communication with the end surface and the other end closed to form a step. In this way, when the first magnet 31 and the second magnet 32 ​​are installed in the mounting groove 332, they are more stable and less likely to fall off.

[0030] Furthermore, to facilitate the installation of the spring clip 50, a socket is provided at the other end of the rotor core 33, opposite to the central axis hole 331. The shape of the socket matches the shape of the spring clip 50, and the spring clip 50 is connected therein. The spring clip 50 is arranged to extend axially along the central axis 10, with one end inserted into the socket and the other end extending out of the rotor core 33 and connected to the end cover 42 of the housing 40. In this embodiment, the spring clip 50 is in the form of a sheet, which can be twisted and deformed and has the ability to return to its original shape, which facilitates the reversal and return of the rotor assembly 30. Preferably, the spring clip 50 is a metal spring clip.

[0031] Furthermore, the end of the central axis hole 331 is flush with the end of the mounting groove 332 .

[0032] In some embodiments, the insertion hole does not extend into the range of the central axis hole 331 , and the elastic piece 50 cooperates with the insertion hole to be connected to the rotor core 33 .

[0033] In some embodiments, the socket extends into the range of the center shaft hole 331 and is connected to the center shaft hole 331. The spring piece 50 cooperates with the socket and is connected to the rotor core 33, or a slot is provided at the end of the center shaft 10. The spring piece 50 passes through the socket and cooperates with the slot, thereby being connected to the rotor core 33 and the center shaft 10.

[0034] Furthermore, the spring piece 50 can be directly plugged into the rotor core 33 or the central shaft 10 for connection, or a plastic encapsulation structure can be provided on the end of the spring piece 50 to connect the rotor core 33 or the central shaft 10. Furthermore, the plastic encapsulation structure can be mated with a socket in the rotor core 33 or a slot in the central shaft 10 for connection.

[0035] Furthermore, the stator assembly 20 includes a stator core 21 and a coil 22 .

[0036] The stator core 21 includes a cylindrical main body 211 and a magnetic shoe 212 protruding from an inner wall of the main body 211 .

[0037] The main body 211 has a racetrack-shaped cross-section, consisting of two relatively parallel flat plates and an arc-shaped portion connecting the ends of the flat plates. This structure minimizes the size of the structure while providing the necessary space for the rotor assembly 30 to move, thereby further facilitating structural miniaturization. In this embodiment, the length of the main body 211 (the dimension along the axial direction of the central axis 10) is consistent with the length of the mounting slot 332.

[0038] The magnetic shoe 212 is symmetrically arranged relative to the central axis 10 and comprises a neck portion 2121 and a head portion 2122. The neck portion 2121 is rectangular and connected between the head portion 2122 and the main body 211. The ends of the head portion 2122 extend symmetrically from the neck portion 2121 along the first direction X, forming a T-shaped structure. The magnetic shoe 212 is used to concentrate magnetic flux, generating a north or south magnetic pole when the energized coil 22 is applied.

[0039] Furthermore, one end of the head portion 2122 facing away from the neck portion 2121 is flat, facing the first magnet 31 and the second magnet 32, and spaced a certain distance from the first magnet 31 and the second magnet 32. In a default state, the neck portion 2121 corresponds to the center position of the first magnet 31 and the second magnet 32.

[0040] In order to drive the rotor assembly 30 to rotate effectively, the size of the plane of the head 2122 in the first direction X is larger than the size of the first magnet 31 and the second magnet 32 ​​in the first direction X, and the size of the head 2122 in the first direction X is smaller than the size of the first magnet 31 and the second magnet 32 ​​in the first direction X.

[0041] The coil 22 is sleeved on the neck 2121 and is used to receive a working current to generate magnetic poles with alternating polarity on the magnetic shoe 212 , thereby driving the rotor assembly 30 to vibrate reciprocatingly at a high frequency through magnetic force.

[0042] Furthermore, an insulating frame 23 may be respectively installed at both ends of the stator core 21 to isolate the coil 22 from direct contact with the stator core 21 .

[0043] The housing 40 includes a shell 41 and an end cover 42 , which are coupled to form an installation space therein for installing the rotor assembly 30 and the stator assembly 20 .

[0044] The shape of the end face of the shell 41 is similar to that of the main body 211 , and the inner wall of the shell 41 fits with the outer wall of the stator core 21 , and they may be fixed by interference fit or by gluing or other methods.

[0045] A bearing 60 is provided at one end of the housing 41 away from the end cover 42 , and the central shaft 10 passes through the bearing 60 and extends out of the outer shell 40 .

[0046] Thus, the dual-magnet micro-vibration device of the present invention is formed. When the working current passes through the coil 22, an N magnetic pole or an S magnetic pole will be generated on the magnetic shoe portion 212. When the current of the coil 22 is reversed, the magnetic poles on the magnetic shoe portion 212 will change. In this way, by controlling the current of the coil 22, the alternating generation of N magnetic poles and S magnetic poles on the magnetic shoe portion 212 can be controlled. Through the magnetic attraction of different shapes attracting each other and like poles repelling each other, the rotor assembly 30 can be driven to rotate back and forth at high frequency through the first magnet 31 and the second magnet 32, thereby driving the central axis 10 to rotate back and forth at high frequency and output high-frequency vibration to the outside. Since only the first magnet and the second magnet 32 ​​are provided on the rotor assembly 30, its structural size is smaller, which is more conducive to product miniaturization. The dual-magnet micro-vibration device of the present invention has a simple structure, light weight, low current, simple assembly process, and low cost. It has strong practicality and should be vigorously promoted.

[0047] Although the present invention is disclosed through the above embodiments, the scope of the present invention is not limited thereto. Without departing from the concept of the present invention, the above components can be replaced with similar or equivalent elements known to those skilled in the art.

Claims

1. A dual-magnet micro-vibration device, characterized in that: The invention relates to a magnetic field generator comprising a central axis (10), a stator assembly (20) and a rotor assembly (30), wherein the rotor assembly (30) is coaxially connected to the central axis (10) and can rotate together with the central axis (10), the stator assembly (20) is surrounded by the rotor assembly (30), and a first magnet (31) and a second magnet (32) are symmetrically distributed along the central axis (10) on the rotor assembly (30), wherein the first magnet (31) and the second magnet (32) are extended in a direction parallel to the central axis (10), and the N magnetic poles and S magnetic poles of the first magnet (31) and the second magnet (32) are distributed along a first direction X, and the first direction X is different from the axial direction of the central axis (10) and the direction of the line connecting the first magnet (31) and the second magnet (32).

2. The dual-magnet micro-vibration device according to claim 1, characterized in that: The first direction X is perpendicular to the axial direction of the central axis (10) and the direction of the center line connecting the central axis (10), the first magnet (31), and the second magnet (32).

3. The dual-magnet micro-vibration device according to claim 2, wherein: The rotor assembly (30) includes a rotor core (33), a central axis hole (331) is provided on the rotor core (33), and a concave mounting groove (332) is provided on two opposite sides of the rotor core (33), the mounting grooves (332) are symmetrically distributed relative to the central axis (10), and the first magnet (31) and the second magnet (32) are respectively embedded in the mounting grooves (332).

4. The dual-magnet micro-vibration device according to claim 3, characterized in that: The two ends of the installation groove (332) along the axial direction are in a shape where one end is closed and the other end is open.

5. The dual-magnet micro-vibration device according to claim 3, characterized in that: The rotor core (33) is formed by a plurality of silicon steel sheets or by laminating silicon steel sheets.

6. The dual-magnet micro-vibration device according to claim 3, characterized in that: An insertion hole is provided at the other end of the rotor core (33) opposite to the central axis hole (331), and a spring piece (50) is connected in the insertion hole. The spring piece (50) is extended along the axial direction of the central axis (10).

7. The dual-magnet micro-vibration device according to claim 6, characterized in that: It also includes a housing (41) and an end cover (42) that are connected in abutment with each other, and the other end of the elastic sheet (50) is inserted into the end cover (42).

8. The dual-magnet micro-vibration device according to claim 6, wherein: The spring piece (50) is in a sheet shape.

9. The dual-magnet micro-vibration device according to claim 1, wherein: The stator assembly (20) comprises a stator core (21) and a coil (22); the stator core (21) comprises a cylindrical main body (211) and a magnetic shoe (212) protruding from the inner wall of the main body (211); the magnetic shoe (212) is symmetrically arranged relative to the central axis (10); the magnetic shoe (212) comprises a neck (2121) and a head (2122); the neck (2121) is connected between the main body (211) and the head (2122); and two ends of the head (2122) extend symmetrically from both sides of the neck (2121) along a first direction X to form a T-shaped structure.

10. The dual-magnet micro-vibration device according to claim 9, wherein: The coil (22) is sleeved on the neck (2121), and the end of the head (2122) facing away from the neck (2121) is a plane, which faces the first magnet (31) and the second magnet (32), and the size of the plane of the head (2122) in the first direction X is larger than the size of the first magnet (31) and the second magnet (32) in the first direction X, and the size of the neck (2121) in the first direction X is smaller than the size of the first magnet (31) and the second magnet (32) in the first direction X.

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