Prototyping of a rotary/linear ultrasonic motor

The object of this research is to design and prototype a linear/rotary ultrasonic motor based upon multi-mode resonance behaviors for a piezoelectrically excited driver structure system. The whole ultrasonic motor system includes a pair of piezoactuator-equipped driver rods, a linear/rotary driven shaft, and a set of high-voltage power stages for energizing the piezoelectric stacks. The linear/rotary ultrasonic motor operating principle basically employs excited resonant modes of the driver structure as applying selected AC frequencies on the equipped piezostacks. Therefore, the prescribed combinational resonant modes of the driver structure result in the driven shaft operating in linear or rotary motions