A Novel Design of Rotated Piezoelectric Actuators based on Impact Driving Principle

The design of rotating piezoelectric actuators is mainly based on the guide shaft structure, and it requires a high accuracy of the output shaft and shaft hole. The working performance and application range of the rotating inertial piezoelectric motor are limited, thus a rotating inertial piezoelectric motor without a guide shaft structure was designed. The actuator can achieve unidirectional rotation movement by the whirling of the inertial mass to produce asymmetrical inertial impact force when the piezoelectric bimorph pasted on the substrate was applied to the asymmetric electrical signal. The dynamic model of the rotated actuator is constructed, and the working principle of the newly designed rotating inertial piezoelectric motor is analyzed and verified by simulation. A piezoelectric experimental system was conducted and frequency characteristic, step length characteristic was tested. The results show that the step size resolution of the rotating inertial piezoelectric motor is 0.64μrad at 100V and 250Hz.