Study on Nonlinear Model of Piezoelectric Actuator and Accurate Positioning Control Strategy

The nonlinearity and hysteresis of piezoelectric actuator are the major factors affecting a positioning accuracy in controlling a micropositioning platform. This paper uses a modified Preisach model to model the hysteresis of a piezoelectric actuator. Open-loop precision positioning control based the established Preisach model was performed, and also the research on using the established Preisach model as a feedforward segment of a PID feedback control was conducted. Experimental results show that this model can effectively eliminate the effects of nonlinearity and hysteresis which affects the displacement output accuracy of a piezoelectric actuator, and improves the dynamic response property