A 2-dimensional impact driven precise actuator using piezoelectric bimorphs

Abstract

A new precise actuator is proposed, which is actuated by the impact force of an end-loaded piezoelectric bimorph cantilever, and bears two degrees of freedom for translation and rotation. The dynamic characteristics of the piezoelectric bimorph were analyzed by FEM, and are further proved by experimental tests. A new control system for the actuator was put forward and tested, which is called the fixed-frequency with adjustable voltage. In addition, the actuator s performance of translation and rotation were both measured. The results demonstrate that the actuator is characterized by a simple structure, large movement range, strong driving ability and high positioning resolution. Its cost is estimated at only 1 % of the traditional impact actuators.