Three-degree-of-freedom vibration isolator based on active electromagnetic negative stiffness structure

Abstract

A three-degree-of-freedom microvibrator based on an active electromagnetic negative stiffness structure belongs to the field of precision vibration isolation technology, including an upper plate, a base plate, and three sets of active electromagnetic negative stiffness structures connecting the upper plate and the base plate. The active electromagnetic negative stiffness structure uses the coaxial nested double magnetic ring structure to realize the negative stiffness characteristics that the stiffness cannot be adjusted in the vertical direction, and uses the energized coil coaxially nested with the double magnetic ring negative stiffness structure to generate precise and controllable excitation flux , change the bias magnetic field around the moving magnetic ring, and then realize the adjustment of the negative stiffness value, adapting to the change of vibration isolation load mass and excitation frequency. The bias magnetic field is provided by the fixed magnetic ring, and only a small current is needed in the coil to generate the excitation flux to adjust the bias magnetic field without continuous high-energy input, and the system has low energy consumption; the double magnetic ring negative stiffness structure and the coil The parallel connection method realizes the adjustable negative stiffness characteristics, and the system has both the high stability of the passive vibration isolation system and the high vibration isolation performance of the active vibration isolation system.

Description

technical field [0001] The invention belongs to the technical field of precision vibration isolation, in particular to a three-degree-of-freedom micro-vibration isolator based on an active electromagnetic negative stiffness structure. Background technique [0002] Low-frequency micro-amplitude vibration interference in the environment has become one of the key issues that limit the accuracy of precision instruments and equipment, and the accuracy of testing and experiments. Equipping precision instruments and equipment with low-frequency vibration isolators has gradually become the main technology for suppressing environmental micro-vibrations in the field of ultra-precision engineering. means. In terms of single-degree-of-freedom vibration isolation, there have been many related studies on low-frequency vibration isolators, but there are very few researches on three-degree-of-freedom low-frequency vibration isolation that is more in line with reality. [0003] Patent No. Z...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of poor adjustability of the existing passive three-degree-of-freedom quasi-zero-stiffness vibration isolator, high cost and energy consumption, poor stability, and complex control algorithm of the active-passive composite three-degree-of-freedom quasi-zero-stiffness vibration isolator. A three-degree-of-freedom microvibrator based on an active electromagnetic negative stiffness structure is proposed

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