Active-passive composite vibration isolator adopting electromagnetic negative rigidity and control method

Abstract

The invention discloses an active-passive composite vibration isolator adopting electromagnetic negative rigidity and a control method. The vibration isolator comprises shells, a force transmission rod, cross-shaped beam spring pieces, an annular rotor, permanent magnets, stators, a fixed iron core, working air gaps, a coil framework and an excitation coil; the permanent magnets generate a staticbias magnetic flux; the excitation coil is electrified to generate excitation magnetic flux to be overlapped with bias flux, the superposition magnetic flux generates electromagnetic stress in the working air gaps between the surface of the annular rotor and the surfaces of the stators and acts on the annular rotors, so that the annular rotors move in the vertical direction, and the force transmission rod connected with the annular rotors also moves in the vertical direction; one of the cross-shaped beam spring pieces is used for connecting the force transmission rod with the upper shell, andthe other cross-shaped beam spring piece is used for connecting the force transmission rod with the lower shell; and the output displacement of the force transmission rod is detected and fed back to the vibration isolator, so that active closed-loop control is realized. According to the vibration isolator, the micro-vibration active-passive vibration isolation control can be realized.

Description

technical field [0001] The invention relates to the technical field of vibration isolation, in particular to an active and passive composite vibration isolator adopting electromagnetic negative stiffness and a control method. Background technique [0002] Vibration isolation devices are widely used in aerospace, ultra-precision machinery manufacturing, micro-electromechanical engineering, optical systems and other fields. The traditional vibration isolation device only works when the disturbance frequency is greater than the resonance frequency of the vibration isolation device times can effectively suppress the vibration. Therefore, in order to improve the vibration isolation performance of the vibration isolator and expand the operating frequency range of the vibration isolator, it is necessary to reduce the resonance frequency of the vibration isolator. The reduction of the resonance frequency is generally achieved by reducing the system stiffness of the vibration isol...

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Problems solved by technology

However, after the design of this kind of negative stiffness mechanism is completed, the stiffness controllability is low, and it cannot flexibly adapt to the disturbance change of the vibration isolation object.

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