MODELING HYSTERESIS IN PIEZOCERAMIC ACTUATORS

A major deficiency of piezoceramic actuators is that their open-loop c ontrol accuracy is seriously limited by hysteresis. This paper discuss es the adaptation of the Preisach model to describe the nonlinear hyst eresis behavior of these actuators. The adapted model is used to predi ct the response of a piezoceramic actuator to a sinusoidal input and a triangular input. The predictions are compared with experimental meas urements on a stacked piezoceramic actuator. The model reproduces the hysteresis loop of the actuator to within 3% over the entire working r ange of 0-15 mu m. This opens the possibility of incorporating the mod el into a control loop in order to overcome the accuracy problem.