Micro-displacement actuator for shear mode magnetorheological elastomer

Abstract

The invention discloses a micro-displacement actuator for a shear mode magnetorheological elastomer, and relates to the field of precision mechanical devices. The actuator comprises a lower housing, a lower magnetizer, an output link, the magnetorheological elastomer, a fixed barrel, an excitation coil, an upper magnetizer, a linear bearing, a fixed flange, a pre-tensioning mechanism and an upperhousing. The actuator uses the output line for micro-displacement output, wherein one end of the output link is connected with the inner side of a cylinder of the magnetorheological elastomer, and the other end of the output link is positioned by the linear bearing; and a pressing force is applied to the top end of the output link by the pre-tensioning mechanism. When the actuator works, the pressing force is applied at first to initially deform the cylinder of the magnetorheological elastomer by a shearing function, and the shearing modulus of the magnetorheological elastomer is changed by controlling a magnetic field after power-on to change the deformation of the elastomer, thereby changing the displacement of the end part of the output link to fulfill the aim of micro-displacement output. The actuator provided by the invention has the advantages of long stroke, stroke adjustability and simple structure.

Description

Technical field [0001] The invention relates to a precision mechanical device, in particular to a micro-displacement actuator based on a smart material magnetorheological elastomer, which is suitable for focusing mechanisms of astronomical telescopes, active optical mirror control, and ultra-finishing industries. High-resolution precision motion drive is performed on the first-stage stroke. Background technique [0002] Precision measurement and micro-scale drive have a wide range of applications in many fields, especially in the optical field. The optical system of an astronomical telescope generally includes optical elements such as primary and secondary mirrors. The distance between the primary and secondary mirrors has a great influence on the imaging quality of the telescope, and the distance between the primary and secondary mirrors will be due to installation errors, temperature changes, and the The deflection caused by gravity at different pitch angle positions changes, ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of small stroke, non-adjustable stroke, complex structure, and low resolution of micro-displacement existing in the prior art, the present invention proposes an intelligent material magneto-rheological elastomer as a variable stiffness element to achieve large-stroke high-resolution micro displacement actuator

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