Characterization of one-wheeled actuator driven by one piezoelectric element

This paper presents a systematical design and characteristic evaluation approach for constructing a one-wheeled actuator driven by one piezoelectric element. Such an actuator is of quite simple construction and equipped with a beam and one movable piezodisc, thereby giving a direct drive which can be particularly useful in applications for micro motion devices. A theoretical model of the actuator is derived based on the lateral elliptical motion, in order to predict driving frequencies of the actuator. Finite element analysis (FEA) modal patterns are employed to investigate dynamic vibration modes, driving frequencies and characteristics of the actuator. Experimental results are conducted for illustration of validity of the proposed design and analysis method, and for verification of characteristics of the one-wheeled actuator.