Asymmetric Two-Piece Piezoelectric Fiber Inertial Drive Device

Abstract

The invention relates to an inertia driving device with asymmetrical double piezoelectric fibers. The inertia driving device comprises an actuator and two mass blocks, wherein the actuator is formed by asymmetrically pasting two piezoelectric fibers onto a metal plate which is bent at a certain radian in advance, the two mass blocks are respectively connected with two ends of the metal plate, the piezoelectric fibers are contracted and deformed under an effect of an alternating voltage so that bending moment is generated on a surface of the metal plate, the mass block at a lower part has effects of stabilizing and supporting, and the mass block at an upper part generates an inertia force during the moving process. Under excitation of an electrical signal, the piezoelectric fiber at a left side is contracted and deformed, the piezoelectric fiber at a right side is stretched and deformed, the mass block at the upper part is driven by the metal plate to swing leftwards, a right inertia impact force is generated, the whole device moves rightwards, the input electrical signal is changed, the metal plate is recovered, the mass block at the upper part moves rightwards to complete a motion period. The inertia driving device has the advantages of simple structure, high device reliability, good mechanism controllability and the like and is easy to implement, and an excitation signal is easy to generate and control.

Description

technical field [0001] The invention belongs to the field of precision mechanical drive. It is used in micro-robot drive, micro-miniature machinery, etc. Background technique [0002] In recent years, with the rapid development of micro-nano technology, there is a demand for micro-mechanical drive technology in the technical fields of biomedical engineering, precision machinery, robots, computers, automatic control, precision measurement, micro-manufacturing of precision devices, and ultra-precision machining. increasing day by day. Traditional precision drive mainly adopts mechanical type, such as precision screw pair, rolling slide guide rail, precision spiral wedge mechanism, etc., but due to the existence of gaps, friction, crawling and other problems, its precision is difficult to meet the requirements. Under this condition, the developed Many new driving methods, such as electrostatic attraction, electromagnetic, magnetostrictive, shape memory alloy and piezoelectric...

AI Technical Summary

Problems solved by technology

Existing piezoelectric inertial drive devices mostly use asymmetrical electrical signals as excitation signals, but this drive device has disadvantages such as difficult signal generation, difficult mechanism control, and relatively large retraction motion.

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