A voice coil motor

Abstract

This utility model relates to the field of motor technology, specifically to a voice coil motor. The voice coil motor includes a housing, a stator housed within the housing, and a mover. Spring contacts are respectively installed at both ends inside the housing. The mover includes a magnetic guide block and a first magnet embedded in the magnetic guide block. Both ends of the magnetic guide block are connected to the spring contacts at both ends inside the housing. The purpose of this utility model is to provide a voice coil motor that optimizes the mover's support method and magnetic circuit design by installing spring contacts at both ends inside the housing and directly connecting the magnetic guide block of the mover to the spring contacts, thereby improving the motor's performance and reliability.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a voice coil motor. Background Technology

[0002] Voice coil motors are widely used in precision positioning, optical alignment, and microelectromechanical systems (MEMS) and have attracted much attention due to their simple structure, fast response, brushless operation, and ease of control. A typical voice coil motor usually consists of a housing, an internal stator, and a mover. Linear displacement and force output are achieved through the interaction between a magnetic field and coils placed around the stator.

[0003] Traditional voice coil motors typically use springs or elastic support structures to reset and guide the mover, but existing technologies have the following problems: Insufficient reset stability: Traditional spring structures are prone to fatigue deformation after long-term use, which leads to a decrease in the reset accuracy of the mover and affects the motion stability and lifespan of the motor.

[0004] Low magnetic circuit efficiency: Some voice coil motors use a single magnet structure for the mover, and the magnetic path design is unreasonable, resulting in low magnetic field utilization and insufficient output force.

[0005] Complex structure: Some solutions use multiple sets of elastic elements or auxiliary guiding mechanisms, which increases assembly difficulty and cost, and may introduce additional friction or vibration interference. Summary of the Invention

[0006] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide a voice coil motor. By setting springs at both ends inside the housing and directly connecting the magnetic block of the mover to the springs, the support method and magnetic circuit design of the mover are optimized, thereby improving the performance and reliability of the motor.

[0007] This utility model is achieved through the following technical solution: A voice coil motor includes a housing, a stator and a mover installed inside the housing, with spring pieces installed at both ends inside the housing; the mover includes a magnetic block and a first magnet embedded in the magnetic block, with both ends of the magnetic block connected to the spring pieces at both ends inside the housing.

[0008] The magnetic block has a second magnet at each end.

[0009] The geometry and relative positions of the first magnet, the second magnet, and the magnetic block are set to generate a preload force when the mover is at rest.

[0010] The second magnet is a neodymium iron boron permanent magnet, and its magnetization direction is arranged at a 90° orthogonal angle to the magnetization direction of the first magnet.

[0011] The magnetic field direction of the first magnet is opposite to that of the second magnet.

[0012] The outer shell includes an upper shell and a lower shell, which are fastened together by at least three fastening points and fastening slots.

[0013] The buckle point has a magnetic component embedded inside, and the buckle groove is equipped with a Hall element, forming a housing closure detection circuit.

[0014] The spring is an elastic metal sheet, and it is fixed to both ends inside the outer shell by riveting, screwing or welding.

[0015] The magnetic block and the spring are fixed together by screw connection.

[0016] The beneficial effects of this utility model are: This utility model discloses a voice coil motor that directly connects the magnetic block and the housing via a spring, providing uniform elastic support, reducing deformation after long-term use, ensuring stable mover reset, and extending the motor's service life. The embedded design of the magnetic block and the first magnet forms a highly efficient magnetic circuit, enhancing magnetic field utilization and improving the motor's output force and response speed. The integrated spring support replaces a complex guiding mechanism, reducing the number of parts, lowering assembly difficulty and production costs, while avoiding additional friction or vibration. The symmetrical layout of the spring effectively suppresses mover wobble, improving the motor's stability under high-speed or high-frequency motion, making it suitable for high-precision applications. Attached Figure Description

[0017] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0018] Figure 1 This is a cross-sectional view of the motor in Example 1.

[0019] Figure 2 This is a cross-sectional view of the motor in Example 2.

[0020] Figure Labels Stator--101, Magnetic Conductor Block--102, First Magnet--103, Second Magnet--104, Spring--105, Clip--106, Clip--107, Upper Shell--108, Lower Shell--109. Detailed Implementation

[0021] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0022] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0023] 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, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] Example 1 like Figure 1 As shown, this embodiment discloses a voice coil motor, which includes a housing, a stator 101, and a mover. The stator 101 typically contains a coil and is fixed inside the housing, while the mover is a movable part.

[0025] In this embodiment, the mover is suspended inside the housing by spring tabs 105 at both ends. Each spring tab 105 is a highly elastic metal sheet, one end of which is securely fixed inside the housing by riveting, screwing, or welding, while the other end is connected to the mover by screwing. This double-spring tab suspension structure provides guidance for the mover to move in a predetermined direction and provides a restoring force so that it can return to its initial position when power is off.

[0026] In this embodiment, the mover includes a magnetic block 102 and a first magnet 103 embedded therein. The first magnet 103 interacts with the stator coil 101 to generate the main Lorentz force, driving the mover to move linearly along the Z-axis to achieve reciprocating vibration.

[0027] Another innovation of this embodiment lies in its outer shell structure and assembly method. The outer shell consists of an upper shell 108 and a lower shell 109, which are fastened together by at least three fastening points 106 engaging with fastening slots 107. During assembly, simply aligning and pressing the upper shell 108 and lower shell 109 achieves quick and secure locking, eliminating the need for screws or glue and greatly simplifying the production process.

[0028] Furthermore, this snap-fit ​​structure is also equipped with a status detection function. Magnetic components (such as small magnets) are pre-embedded or embedded inside the snap point 106, while a Hall element is installed inside the corresponding snap groove 107. When the upper and lower shells 109 are fully engaged, the magnetic component moves precisely into the sensing range of the Hall element, causing it to flip its voltage level and output an electrical signal indicating successful closure. This signal can be used for automated detection on the production line or integrated into the functional self-test program of the terminal equipment to confirm the structural integrity of the VCM.

[0029] Example 2 In this embodiment, to improve motor performance, preferably, second magnets 104 are also provided at both ends of the magnetic block 102. These second magnets 104, together with the first magnet 103 and other magnetic or magnetically conductive components (not shown) within the housing, constitute a special magnetic field environment. By precisely designing their geometry, relative position, and magnetic field strength, the mover is still subjected to a balanced magnetic force when at rest (zero current). This magnetic force causes the spring 105 to produce a slight elastic deformation, thereby forming a preload force. This preload force can eliminate the tiny mechanical gaps within the system, keeping the mover in a taut state at all times. Once the driving current is applied, the mover can respond instantaneously without delay and quickly stabilize after the movement stops.

[0030] Specifically, the second magnet 104 is a powerful neodymium iron boron permanent magnet, and its magnetization direction is set to be 90° orthogonal to the magnetization direction of the first magnet 103. For example, if the first magnet 103 is used to generate the driving force along the Z-axis, the magnetic field direction of the second magnet 104 can be designed to be in the XY plane. This orthogonal arrangement helps to separate magnetic fields with different functions and reduce mutual interference.

[0031] In this embodiment, the magnetic field direction of the first magnet 103 is opposite to that of the second magnet 104. For example, the upper end of the first magnet 103 is the N pole and the lower end is the S pole; the upper end of the second magnet 104 is the S pole and the lower end is the N pole. This arrangement causes the magnetic field lines between the same magnetic poles of the first magnet 103 and the second magnet 104 to exhibit a repulsive state. The magnetic field lines tend to avoid each other and form a tendency to push and shove each other, making the magnetic field lines very dense and diverging outward, thereby increasing the local intensity of the magnetic field in that region of the mover.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A voice coil motor, comprising a housing, a stator mounted within the housing, and a mover, characterized in that, The outer casing is equipped with spring clips at both ends; The moving element includes a magnetic block and a first magnet embedded in the magnetic block. The two ends of the magnetic block are respectively connected to the spring pieces at both ends inside the outer shell.

2. A voice coil motor according to claim 1, characterized in that, A second magnet is provided at each end of the magnetic block.

3. A voice coil motor according to claim 2, characterized in that, The geometry and relative positions of the first magnet, the second magnet, and the magnetic block are set to generate a preload force when the mover is at rest.

4. A voice coil motor according to claim 2, characterized in that, The second magnet is a neodymium iron boron permanent magnet, and its magnetization direction is arranged at 90° orthogonal to the magnetization direction of the first magnet.

5. A voice coil motor according to claim 2, characterized in that, The magnetic field direction of the first magnet is opposite to that of the second magnet.

6. A voice coil motor according to claim 1, characterized in that, The outer shell includes an upper shell and a lower shell, which are fastened together by no less than three fastening points and fastening slots.

7. A voice coil motor according to claim 6, characterized in that, The buckle has a magnetic component embedded inside and a Hall element inside the buckle groove, forming a detection circuit for the closed state of the housing.

8. A voice coil motor according to claim 1, characterized in that, The spring is an elastic metal sheet, and the spring is fixed to both ends inside the outer shell by riveting, screwing or welding.

9. A voice coil motor according to claim 1, characterized in that, The magnetic block and the spring are fixed together by screw connection.

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