Linear motor capable of reducing vibration in Z direction

Abstract

The invention relates to a linear motor for Z-direction vibration reduction. The linear motor comprises a stator, a rotor and an elastic damping part for connecting the stator and the rotor, the stator comprises symmetrically arranged coils, a base and a bracket; the rotor comprises a magnetic circuit, a mass block and a cover plate; the magnetic circuit is formed by a plurality of magnetic steels, the coils are symmetrically arranged in magnetic fields on the upper side and the lower side of the magnetic circuit, and the flow directions of currents in the symmetrically arranged coils are kept consistent; the magnetizing direction of the magnetic circuit is Z-direction magnetizing, and the directions of the adjacent magnetic steels are opposite. A symmetrical coil structure is adopted, coils are configured in magnetic fields on the upper side and the lower side of a magnetic circuit, and the flow directions of currents in the two coils are kept consistent; when the coils deviate from the balance position, the Z-axis direction forces borne by the upper coil and the lower coil are in opposite trends; regardless of the stator or the rotor, the resultant force on the whole can be approximately counteracted to zero, and the source of Z-direction vibration is eliminated in design.

Description

Technical Field

[0001] The invention relates to the technical field of linear motors, and in particular to a linear motor with Z-axis vibration reduction. Background Art

[0002] Linear motors, as an advanced driving device, are widely used in electronic devices such as smartphones, tablets, and game controllers to achieve fast and accurate vibration feedback. In a planar X-linear motor, Z-direction vibration usually refers to vibration perpendicular to the motor plane (that is, perpendicular to the X-axis and Y-axis). The Z-direction vibration decays rapidly when it is far away from the source (that is, the position on the xy plane), which makes it difficult to effectively use this vibration for tactile feedback on large-screen devices. Therefore, Z-direction vibration is often regarded as unintended vibration because it does not meet the needs of large-screen tactile feedback well. In order to optimize the tactile feedback effect, it is necessary to reduce or control the Z-direction vibration to ensure that the vibration is mainly concentrated in the xy plane, thereby providing a clearer and stronger tactile experience.

[0003] The main causes of Z-direction vibration include insufficient manufacturing precision and design defects; insufficient manufacturing precision may manifest itself as factors such as assembly errors. Although these factors are difficult to completely eliminate, they can have a relatively small impact on Z-direction vibration through manufacturing control. In contrast, design reasons have a more significant impact on z-direction vibration. During motor vibration, the farther it deviates from the equilibrium position, the greater the force it is subjected to in the z-direction. When the motor deviates from the equilibrium position during vibration, a larger z-direction force will be generated, making it difficult to completely avoid unexpected z-direction vibration of the motor. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a linear motor with Z-direction vibration reduction, so as to reduce the Z-direction force applied to the linear motor when the linear motor deviates from the equilibrium position during vibration.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a linear motor with Z-axis vibration reduction, including a stator, a mover and an elastic damping member connecting the stator and the mover; the stator includes a symmetrically arranged coil, a base and a bracket; the mover includes a magnetic circuit, a mass block and a cover plate; the magnetic circuit is formed by a plurality of magnets, the coils are symmetrically arranged in the magnetic fields on the upper and lower sides of the magnetic circuit, and the current flow direction in the symmetrically arranged coils remains consistent; the magnetization direction of the magnetic circuit is Z-axis magnetization, and the directions of adjacent magnets are opposite.

[0006] Furthermore, the coils described in the present invention are symmetrically arranged in one group, and the number of coils is one group or more groups.

[0007] Furthermore, the coil of the present invention is fixedly connected to the bracket.

[0008] Furthermore, in the present invention, when the coil deviates from its equilibrium position, the forces in the Z-axis direction received by the upper and lower symmetrically arranged coils present opposite trends.

[0009] Furthermore, the magnetic steel of the present invention is connected to the elastic damping component after being fixed by glue.

[0010] Furthermore, the magnetic steel described in the present invention is fixed to the magnetic steel bracket and then connected to the elastic damping component.

[0011] Furthermore, the elastic damping member described in the present invention is an elastic arm made of rubber material or an elastic arm made of metal material; the elastic arm has an upper arm and a lower arm; the upper arm and the lower arm are respectively connected to the brackets arranged on the upper and lower sides of the magnetic circuit; the elastic arm's easy vibration direction is in the horizontal direction, and the structure is symmetrical relative to the Z direction.

[0012] The beneficial effect of the present invention is that it solves the defects existing in the background technology and adopts a symmetrical coil structure, in which coils are arranged in the magnetic fields on the upper and lower sides of the magnetic circuit, and the current flow direction in the two coils remains consistent; when the coil deviates from its equilibrium position, the Z-axis direction forces exerted on the upper and lower coils show opposite trends; whether it is used as a stator or a mover, the overall resultant force exerted on it can be approximately offset to zero, thereby eliminating the source of z-direction vibration from the design. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of an embodiment of the present invention; Figure 2 is a schematic structural diagram of another embodiment of the present invention; Figure 3 This is a schematic diagram of the Z-direction force after the present invention is adopted; In the figure: 1. Coil; 2. Bracket; 3. Magnet; 4. Magnetic bracket; 5. Elastic arm. DETAILED DESCRIPTION

[0014] The present invention will now be described in further detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0015] like Figure 1-Figure 3 A linear motor with Z-direction vibration reduction is shown, comprising a stator, a mover and an elastic damping member connecting the stator and the mover; the stator comprises a symmetrically arranged coil 1, a base and a bracket 2; the mover comprises a magnetic circuit, a mass block and a cover plate; wherein the structures of the stator and the mover are interchangeable; the magnetic circuit is formed by a plurality of magnets 3, the coil 1 is symmetrically arranged in the magnetic fields on the upper and lower sides of the magnetic circuit, and the current flow direction in the symmetrically arranged coils is consistent; the magnetization direction of the magnetic circuit is Z-direction magnetization, and the directions of adjacent magnets are opposite.

[0016] The coil 1 is symmetrically arranged in a group, and the number of coils can be 1 group of two, 2 groups of four, or n groups of 2n.

[0017] The coil 1 is fixedly connected to the bracket 2; after the connection, the brackets 2 arranged on the upper and lower sides of the magnetic circuit can be regarded as an integrated structure. The brackets 2 arranged on the upper and lower sides of the magnetic circuit can be fixedly connected or rigidly connected to the elastic damping member, and the elastic damping member is an elastic arm made of rubber or an elastic arm 5 made of metal; the elastic arm 5 has an upper arm and a lower arm; the upper arm and the lower arm are respectively connected to the brackets arranged on the upper and lower sides of the magnetic circuit; the elastic arm is easy to vibrate in the horizontal direction, and has a symmetrical structure relative to the Z direction.

[0018] The magnetization direction of the magnetic circuit is Z-direction magnetization, and the directions of two adjacent magnets are opposite; the magnetic circuit part can be just the magnet fixed with glue and connected to the elastic arm, such as Figure 2 The magnetic steel can also be fixed to the magnetic steel bracket 4 and then connected to the elastic arm, such as Figure 1 As shown; the elastic arm can be made of a damped rubber-like material or a metal material, but the vibration direction must be in the horizontal direction and the structure must be symmetrical relative to the Z direction, that is, the elastic arm must also avoid causing vibration in the z direction to the system.

[0019] The present invention is based on the principles of electromagnetic mechanics and effectively suppresses vibration in the Z-axis direction through an innovative coil layout design. The core principle is that when the coil assembly is axially offset due to external excitation, according to the law of action of the Lorentz force, the two groups of coils symmetrically arranged up and down will respectively generate axial electromagnetic forces (F_z and -F_z) in opposite directions under the same magnetic field environment. By rigidly connecting this pair of reverse force systems to the same support structure, a self-balancing couple system is formed. According to the mechanical equilibrium characteristics of Newton's third law, the total torque of the system in the Z-axis direction is ΣF_z=K(F_z-F_z)≈0 (where K is the structural coupling coefficient), thereby achieving self-cancellation of vibration at the mechanical structure level, and the total force it is subjected to can be approximately offset to zero, eliminating the source of z-direction vibration from the design, such as Figure 3 shown.

[0020] The above description only describes the specific implementation mode of the present invention. Various examples do not limit the essential content of the present invention. After reading the description, ordinary technicians in the relevant technical field can modify or deform the specific implementation modes described above without departing from the essence and scope of the invention.

Claims

1. A linear motor with Z-axis vibration reduction, characterized in that: It includes a stator, a mover and an elastic damping member connecting the stator and the mover; the stator includes a symmetrically arranged coil, a base and a bracket; the mover includes a magnetic circuit, a mass block and a cover plate; the magnetic circuit is formed by a plurality of magnetic steels, the coils are symmetrically arranged in the magnetic fields on the upper and lower sides of the magnetic circuit, and the current flow direction in the symmetrically arranged coils is consistent; the magnetization direction of the magnetic circuit is Z-direction magnetization, and the directions of adjacent magnetic steels are opposite.

2. A linear motor with Z-axis vibration reduction as claimed in claim 1, characterized in that: The coils are symmetrically arranged in one group, and the number of coils is one or more groups.

3. A linear motor with Z-axis vibration reduction as claimed in claim 2, characterized in that: The coil is fixedly connected to the bracket.

4. A linear motor with Z-axis vibration reduction as claimed in claim 2, characterized in that: When the coil deviates from its equilibrium position, the forces in the Z-axis direction received by the upper and lower symmetrically arranged coils present opposite trends.

5. A linear motor with Z-axis vibration reduction as claimed in claim 3, characterized in that: The magnetic steel is fixed with glue and then connected with the elastic damping component.

6. A linear motor with Z-axis vibration reduction as claimed in claim 3, characterized in that: The magnetic steel is fixed to the magnetic steel bracket and then connected to the elastic damping component.

7. A linear motor with Z-axis vibration reduction as claimed in claim 5 or 6, characterized in that: The elastic damping member is an elastic arm made of rubber material or an elastic arm made of metal material.

8. A linear motor with Z-axis vibration reduction as claimed in claim 7, characterized in that: The elastic arm has an upper arm and a lower arm; the upper arm and the lower arm are respectively connected to brackets arranged on the upper and lower sides of the magnetic circuit; the elastic arm is easy to vibrate in the horizontal direction and has a symmetrical structure relative to the Z direction.

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