Three-degree-of-freedom electromagnetic vibration isolation device based on magnetic repulsion positive and negative stiffness parallel connection

Abstract

The invention provides a three-degree-of-freedom electromagnetic vibration isolation device based on magnetic repulsion positive and negative stiffness parallel connection, and belongs to the technical field of precision vibration isolation. An X-direction magnetic spring and a Y-direction magnetic spring are vertically arranged and are connected in parallel with a Z-direction positive stiffness spring, so that a positive and negative stiffness structure of the three degrees of freedom are connected in parallel; the X-direction magnetic spring is composed of a first fixed magnet, a first movable magnet, a second movable magnet and a second fixed magnet which are sequentially arrayed along a horizontal axis X, and the Y-direction magnetic spring is composed of a third fixed magnet, a thirdmovable magnet, a fourth movable magnet and a fourth fixed magnet along a horizontal axis Y in sequence. The three-degree-of-freedom electromagnetic vibration isolation device is simple and flexible in structural design, and high in magnetic material utilization rat, and realizes the low frequency/ultra-low-frequency vibration isolation effects of three-degree-of-freedom of precision instrument equipment.

Description

technical field [0001] The invention belongs to the technical field of precision vibration isolation, in particular to a three-degree-of-freedom electromagnetic vibration isolation device based on the parallel connection of positive and negative stiffnesses of magnetic repulsion force. Background technique [0002] In the process of installation, testing and experimentation of precision instruments and equipment, low-frequency micro-amplitude vibration interference in the environment has become one of the key issues affecting research results. Equipping precision instruments and equipment with low-frequency vibration isolators has gradually become a field of precision engineering to suppress environmental micro-vibration main technical means. Low-frequency vibration isolators mostly use positive and negative stiffness structures connected in parallel or in series to achieve low-frequency vibration isolation effects. At present, there are more studies on single-degree-of-free...

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Problems solved by technology

[0006] Aiming at the problem that the magnetic material utilization rate of the existing three-degree-of-freedom electromagnetic vibration isolator is low, and a motion guiding mechanism is required to realize the stiffness characteristics in a specific direction, the present invention proposes a three-degree-of-freedom electromagnetic vibration isolator based on the parallel connection of positive and negative stiffness of magnetic repulsion force , the three-degree-of-freedom electromagnetic vibration isolator uses the positive stiffness generated by the X-direction magnetic spring in parallel with the negative stiffness generated by the Y-direction magnetic spring in the X direction to realize the low-frequency vibration isolation effect; in the Y direction, uses the negative stiffness generated by the X-direction magnetic spring The stiffness is connected in parallel with the positive stiffness generated by the Y-direction magnetic spring to achieve the low-frequency vibration isolation effect. In the Z direction, the negative stiffness generated by the X-direction magnetic spring is used in parallel with the negative stiffness generated by the Y-direction magnetic spring to offset the stiffness value of the Z-direction positive stiffness spring. , so as to realize the low-frequency vibration isolation effect of three degrees of freedom

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