A linear motor drive structure of small size

Abstract

The utility model belongs to linear motor technical field, concretely is a kind of linear motor drive structure of small size, including the shell, the bottom of the shell is equipped with stator assembly, the inside of the shell is equipped with vibrator assembly, the utility model discloses the cooperation design of L-shaped clamping plate, semicircle ball and round groove is used in quick mounting mechanism, spring piece can be directly fixed with bottom plate by clamping mode, without bolt, welding and other complex technology, while guaranteeing the stability of connection, it realizes quick disassembly, in guide mechanism, the guide rail of shell inner wall and the guide groove of mass block outside slide fit, the movement track of vibrator assembly can be accurately limited, avoid the deviation or skew when Z direction vibration, simultaneously, the nesting layout of magnetic bowl is equipped in coil outside, coil is equipped in the outside of magnetic steel, cooperate small size mass block and the application of flexible circuit board, maximum limit compression internal space, make overall structure can adapt to superminiature wearable equipment such as intelligent ring.

Description

Technical Field

[0001] This utility model relates to the field of linear motor technology, specifically to a small-sized linear motor drive structure. Background Technology

[0002] With the increasing variety of application scenarios for consumer electronics products, motors play a crucial role, especially in wearable devices, primarily providing vibration feedback for functions such as call alerts and touch feedback. These features enhance the user experience, making wearable devices more intelligent and user-friendly. Miniature vibration motors are one of the most commonly used motor types in wearable devices. As technology advances, there is a growing demand for smaller and smaller miniature vibration motors, which places increasingly higher demands on the spatial design of the motor drive structure.

[0003] Existing linear motor drive structures are bulky, making it difficult to meet the space constraints of micro-devices. They also rely heavily on welding processes to assemble spring sheets, resulting in low assembly efficiency. Furthermore, the oscillator assembly is prone to misalignment and jamming during vibration due to a lack of precise guidance, affecting the stability and consistency of vibration feedback. This further limits their application in ultra-small devices such as smart rings. To address this, we propose a smaller linear motor drive structure. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a small-sized linear motor drive structure. The quick-release mechanism employs an L-shaped snap-fit ​​plate, a hemispherical shape, and a circular groove. The spring sheet can be directly fixed to the base plate via a snap-fit ​​mechanism. In the guiding mechanism, the guide rail on the inner wall of the housing slides into the guide groove on the outer side of the mass block. A nested layout, with the magnetic cup sleeved on the outer side of the coil and the coil sleeved on the outer side of the magnet, combined with the small-sized mass block and the application of a flexible circuit board, enables the overall structure to be adapted to ultra-small wearable devices, thus solving the problems mentioned earlier.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a small-sized linear motor drive structure, comprising a housing, a stator assembly mounted at the bottom of the housing, and an oscillator assembly mounted inside the housing; the stator assembly includes a base plate fixedly connected to the bottom side of the housing, a circuit board mounted on the top side of the base plate, and a coil connected to the center of the top side of the circuit board; the oscillator assembly includes a mass block disposed inside the housing, a slot extending through the center of the mass block, a magnetic cup fixedly inserted inside the slot, a magnet fixedly connected to the top side of the magnetic cup, the magnetic cup being sleeved on the outside of the coil, the coil being sleeved on the outside of the magnet, a spring plate also being provided on the top side of the base plate, a quick-release mechanism being installed between the base plate and the spring plate, the top side of the spring plate abutting against the bottom side of the mass block, and a guide mechanism being provided between the mass block and the inner wall of the housing.

[0006] Preferably, the quick-installation mechanism includes several L-shaped snap-fit ​​plates, all of which are fixedly connected to the top edge of the housing. The bottom side of the spring sheet is inserted into the bottom side of the L-shaped snap-fit ​​plates, and a hemisphere is fixedly connected to the bottom side of each of the L-shaped snap-fit ​​plates. Several circular grooves are opened through the bottom of the spring sheet, and the hemisphere is snapped into the circular grooves.

[0007] Preferably, the guiding mechanism includes several guide rails, all of which are fixedly connected to the inner side wall of the housing. The outer side wall of the mass block is provided with several guide grooves, and the guide rails are slidably connected to the guide grooves.

[0008] Preferably, the diameter of the mass block is 3.65mm-3.70mm of the circuit board.

[0009] Preferably, a gasket is fixedly connected to the bottom side of the magnet.

[0010] Preferably, a pad is fixedly connected to the inner top side of the housing.

[0011] Preferably, the circuit board is a flexible circuit board made of an elastic material.

[0012] This invention provides a compact linear motor drive structure. Compared with the prior art, it has the following advantages:

[0013] 1. This small-sized linear motor drive structure adopts an L-shaped snap-fit ​​plate, a hemispherical ball and a circular groove matching design in the quick-installation mechanism. The spring sheet can be directly fixed to the base plate by snap-fit, without the need for bolts, welding and other complex processes. It can achieve quick disassembly while ensuring connection stability, which is convenient for later maintenance and component replacement.

[0014] 2. This small-sized linear motor drive structure features a guide mechanism in which the guide rail on the inner wall of the housing slides into the guide groove on the outer side of the mass block, precisely limiting the movement trajectory of the oscillator assembly and preventing deviation or skew during Z-axis vibration. Meanwhile, the nested layout of the magnetic cup being sleeved on the outer side of the coil and the coil being sleeved on the outer side of the magnet, combined with the application of a small-sized mass block and flexible circuit board, maximizes the compression of internal space, enabling the overall structure to be adapted to ultra-small wearable devices such as smart rings. Attached Figure Description

[0015] Figure 1 This is a front view structural diagram of the main body of this utility model;

[0016] Figure 2 This is a schematic diagram of the main body disassembled structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the main body disassembled structure of this utility model from another perspective;

[0018] Figure 4 This is a schematic diagram of the front cross-sectional structure of the main body of this utility model;

[0019] Figure 5 This is a schematic diagram of the connection structure between the spring sheet and the L-shaped snap-fit ​​plate of this utility model;

[0020] Figure 6 This utility model Figure 4 Enlarged schematic diagram of the structure at point A in the middle.

[0021] In the diagram: 1. Housing; 2. Base plate; 3. Circuit board; 4. Mass block; 5. Slot; 6. Magnetic cup; 7. Coil; 8. Spring plate; 9. Guide groove; 10. Guide rail; 11. Pad; 12. Magnet; 13. Gasket; 14. L-shaped snap-fit ​​plate; 15. Hemisphere; 16. Circular groove. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-6 This utility model provides a technical solution: a small linear motor drive structure, including a housing 1, a stator assembly installed at the bottom of the housing 1, and an oscillator assembly installed inside the housing 1;

[0024] The stator assembly includes a base plate 2, which is fixedly connected to the bottom side of the housing 1. A circuit board 3 is mounted on the top side of the base plate 2, and a coil 7 is connected to the center of the top side of the circuit board 3.

[0025] The oscillator assembly includes a mass block 4, which is disposed inside the housing 1. A slot 5 is provided through the middle of the mass block 4. A magnetic cup 6 is fixedly inserted into the slot 5. A magnet 12 is fixedly connected to the top side of the magnetic cup 6. The magnetic cup 6 is sleeved on the outside of the coil 7. The coil 7 is sleeved on the outside of the magnet 12. A spring plate 8 is also provided on the top side of the base plate 2. A quick-release mechanism is installed between the base plate 2 and the spring plate 8. The top side of the spring plate 8 abuts against the bottom side of the mass block 4. A guide mechanism is also provided between the mass block 4 and the inner wall of the housing 1.

[0026] When this small linear motor drive structure is working, after the circuit board 3 is powered on, the coil 7 generates an electromagnetic field, which interacts with the magnet 12 inside the magnetic bowl 6 to generate an electromagnetic force, pushing the magnetic bowl 6 and the mass block 4 to move along the Z direction. The spring plate 8 undergoes elastic deformation under the action of the mass block 4, storing elastic potential energy. When the electromagnetic force changes, the elastic force of the spring plate 8 drives the mass block 4 to move in the opposite direction, forming reciprocating vibration. During this process, the guide mechanism ensures that the mass block 4 moves stably along the predetermined trajectory of the inner wall of the housing 1, while the quick-release mechanism ensures a stable connection between the spring plate 8 and the base plate 2, maintaining the stability of the overall structure during vibration.

[0027] The quick-release mechanism includes several L-shaped snap-fit ​​plates 14, which are fixedly connected to the top edge of the housing 1. The bottom side of the spring plate 8 is inserted into the bottom side of the L-shaped snap-fit ​​plate 14, and a hemisphere 15 is fixedly connected to the bottom side of each L-shaped snap-fit ​​plate 14. Several circular grooves 16 are opened through the bottom of the spring plate 8, and the hemisphere 15 is snapped into the circular grooves 16.

[0028] When the quick-assembly mechanism is working, several L-shaped snap-fit ​​plates 14 are fixed to the top edge of the housing 1. During assembly, the bottom side of the spring plate 8 is inserted into the bottom side of the L-shaped snap-fit ​​plate 14, so that the hemispherical ball 15 on the bottom side of the L-shaped snap-fit ​​plate 14 is inserted into the circular groove 16 at the bottom of the spring plate 8. Through the snap-fit ​​cooperation between the hemispherical ball 15 and the circular groove 16, the spring plate 8 and the base plate 2 are quickly fixed, ensuring the stability of the spring plate 8 during operation.

[0029] The guiding mechanism includes several guide rails 10, which are fixedly connected to the inner side wall of the housing 1. Several guide grooves 9 are provided on the outer side wall of the mass block 4, and the guide rails 10 are slidably connected to the guide grooves 9.

[0030] When the guiding mechanism is working, when the mass block 4 vibrates inside the housing 1, the guide rail 10 slides in the guide groove 9. Through the cooperation between the guide rail 10 and the guide groove 9, the movement direction of the mass block 4 is restricted and guided, ensuring that the mass block 4 moves stably along the set trajectory.

[0031] The diameter of mass block 4 is 3.65mm-3.70mm of the circuit board. This size design allows mass block 4 to fit into the internal space of the housing 1. As the main vibrating mass in the oscillator assembly, it vibrates under the action of electromagnetic force and the elastic force of spring plate 8. Its specific diameter ensures the miniaturization of the overall structure while guaranteeing the stability of the vibration effect.

[0032] A gasket 13 is fixedly connected to the bottom side of the magnet 12. The gasket 13 can form a buffer between the magnet 12 and other components, reduce the direct collision and friction between the magnet 12 and components such as the coil 7 during vibration, protect the magnet 12 and the coil 7, extend their service life, and maintain the stability of the position of the magnet 12 in the magnetic bowl 6.

[0033] A pad 11 is fixedly connected to the top side inside the housing 1. When the vibrator assembly vibrates upward, the pad 11 can buffer and limit the mass block 4, preventing the mass block 4 from directly hitting the top of the housing 1 and causing damage, reducing noise and component wear during vibration, and ensuring the stable operation of the motor as a whole.

[0034] The circuit board 3 is a flexible circuit board made of elastic material, which can adapt to the narrow space and vibration environment inside the motor. It can be stably installed on the top side of the base plate 2 to provide power transmission to the coil 7, ensuring that the coil 7 generates a stable electromagnetic field after being energized, thereby driving the oscillator assembly to vibrate. At the same time, the flexibility can reduce the impact of vibration on the circuit connection.

[0035] Working principle: When the small linear motor drive structure is working, after the circuit board 3 is powered on, the coil 7 generates an electromagnetic field, which interacts with the magnet 12 inside the magnetic bowl 6 to generate an electromagnetic force, pushing the magnetic bowl 6 and the mass block 4 to move along the Z direction. The spring plate 8 undergoes elastic deformation under the action of the mass block 4, storing elastic potential energy. When the electromagnetic force changes, the elastic force of the spring plate 8 drives the mass block 4 to move in the opposite direction, forming reciprocating vibration. When the mass block 4 vibrates inside the housing 1, the guide rail 10 slides in the guide groove 9. Through the cooperation of the guide rail 10 and the guide groove 9, the movement direction of the mass block 4 is restricted and guided, ensuring that the mass block 4 moves stably along the set trajectory.

[0036] When the spring plate 8 is assembled, since several L-shaped snap-fit ​​plates 14 are fixed to the top edge of the housing 1, the bottom side of the spring plate 8 is inserted into the bottom side of the L-shaped snap-fit ​​plate 14, so that the hemispherical ball 15 on the bottom side of the L-shaped snap-fit ​​plate 14 is inserted into the circular groove 16 at the bottom of the spring plate 8. Through the snap-fit ​​cooperation between the hemispherical ball 15 and the circular groove 16, the spring plate 8 and the base plate 2 are quickly fixed, ensuring the stability of the spring plate 8 during operation.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A small-sized linear motor drive structure, comprising a housing (1), characterized in that: A stator assembly is installed at the bottom of the housing (1), and an oscillator assembly is installed inside the housing (1); The stator assembly includes a base plate (2), which is fixedly connected to the bottom side of the housing (1). A circuit board (3) is mounted on the top side of the base plate (2), and a coil (7) is connected to the middle of the top side of the circuit board (3). The oscillator assembly includes a mass block (4), which is located inside the housing (1). A slot (5) is provided through the middle of the mass block (4). A magnetic cup (6) is fixedly inserted into the slot (5). A magnet (12) is fixedly connected to the top side of the magnetic cup (6). The magnetic cup (6) is sleeved on the outside of the coil (7). The coil (7) is sleeved on the outside of the magnet (12). A spring plate (8) is also provided on the top side of the base plate (2). A quick-release mechanism is installed between the base plate (2) and the spring plate (8). The top side of the spring plate (8) abuts against the bottom side of the mass block (4). A guide mechanism is also provided between the mass block (4) and the inner wall of the housing (1).

2. The small-sized linear motor drive structure according to claim 1, characterized in that: The quick-installation mechanism includes several L-shaped snap-fit ​​plates (14), which are fixedly connected to the top edge of the housing (1). The bottom side of the spring plate (8) is inserted into the bottom side of the L-shaped snap-fit ​​plate (14), and a hemisphere (15) is fixedly connected to the bottom side of the L-shaped snap-fit ​​plate (14). Several circular grooves (16) are opened through the bottom of the spring plate (8), and the hemisphere (15) is snapped into the circular groove (16).

3. The small-sized linear motor drive structure according to claim 1, characterized in that: The guiding mechanism includes several guide rails (10), which are fixedly connected to the inner side wall of the housing (1). Several guide grooves (9) are provided on the outer side wall of the mass block (4), and the guide rails (10) are slidably connected to the guide grooves (9).

4. The small-sized linear motor drive structure according to claim 1, characterized in that: The diameter of the mass block (4) is 3.65mm-3.70mm of the circuit board.

5. The small-sized linear motor drive structure according to claim 1, characterized in that: A gasket (13) is fixedly connected to the bottom side of the magnet (12).

6. The small-sized linear motor drive structure according to claim 1, characterized in that: A pad (11) is fixedly connected to the top side of the inner side of the housing (1).

7. The small-sized linear motor drive structure according to claim 1, characterized in that: The circuit board (3) is a flexible circuit board made of elastic material.

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