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 invention relates to the technical field of actuation, in particular to an actuator and a 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. accomplish. Therefore, various actuators based on piezoelectric stacks have been widely used in the fields of machinery, electric power, and aerospace engineering, and have become one of the most promising intelligent drive devices. Due to the small output displacement of the piezoelectric stack, the current actuators made of the piezoelectric stack mostly improve the performance of the actuator through reasonable structural design. [0003] Most of the existing torque actuators based on piezoelectric materials are lever structures, that is, the piezoelectric stack acts on one end of the ...

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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