A research based on piezoelectric ceramic hysteretic modeling and inverse control

Piezoelectric actuators are widely applied as actuators in micro/nano-positioning systems, due to its characteristic of infinitely small displacement resolution. At the same time, piezoelectricity material has nonlinear hysteretic phenomena, it will induce low position precision and it also results in closed-loop controlling system instable. This paper presents a new approach for modeling hysteretic nonlinearity in piezoelectric ceramic actuators. It is proved that the new hysteretic model can be proved to the general continuous, which makes use of polar coordinate. An advantage is that the proposed model simplifies the identification procedure of its inverse model. The model can accurately predict the response of hysteretic nonlinearity in piezoelectric ceramic actuators, when the input voltage is periodical and triangular signal; an inverse hysteretic model feedforward control strategy is then developed and implemented to compensate for the system ever present hysteretic nonlinearity.