Actuator and method for achieving torque through piezoelectric-link mechanisms

Abstract

The invention provides an actuator and method for achieving the torque through piezoelectric-link mechanisms. The actuator is composed of the piezoelectric-link mechanisms, pins, actuating discs, a driver and a controller. The method includes the following steps of firstly, amplifying miniature linear displacement outputted by piezoelectric materials through piezoelectric constraint-multi-stage displacement amplifying mechanisms and then outputting the displacement, wherein the piezoelectric-link mechanisms are composed of piezoelectric stacks and the piezoelectric constraint-multi-stage displacement amplifying mechanisms; secondly, exerting pulling force and linear displacement on the pins located on the actuating discs through the piezoelectric-link mechanisms, wherein a certain distance exists between each pin and the circle center of the corresponding actuating disc so that force and linear displacement outputted by the piezoelectric materials can be converted into torque output and continuous rotation of the actuating discs; thirdly, exerting different magnitudes of pulling force or lost motion on the pins at different phase positions where the different numbers of piezoelectric-link mechanisms rotate so that it can be ensured that the actuator stably outputs the torque. The actuator and method have the advantages of being large in output torque, small in energy consumption, free of phase intervals, capable of conducting multi-circle continuous actuation, high in timeliness and the like.

Description

Technical field [0001] The present invention relates to the field of actuation technology, in particular to an actuator and method for realizing torque through a piezoelectric-link mechanism. Background technique [0002] Actuators based on piezoelectric materials have the advantages of high output displacement resolution, large output force, fast response, low power consumption, and small size. At the same time, with the advancement of processing technology, piezoelectric stacks that can meet different requirements can be achieve. Therefore, various actuators based on piezoelectric stacks have been widely used in the fields of machinery, electricity, aerospace engineering, etc., and have become one of the most promising intelligent driving devices. Since the output displacement of the piezoelectric stack is relatively small, the actuators made by the piezoelectric stack are often designed to improve the performance of the actuators through reasonable structural design. [0003] ...

AI Technical Summary

Problems solved by technology

Due to its small maximum output angle and large force, this structure is mostly suitable for vibration reduction of aerospace structures; while it is required to have anti-electromagnetic interference, low structural quality, large range, no phase interval, power-off lock, etc. function, it is difficult for this type of actuator to meet the above conditions

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