HYSTERESIS FREE-CHARACTERISTICS IN CERAMIC MULTILAYER ACTUATOR DRIVEN BY A CHARGE CONTROL METHOD

摘要

This paper presents a method to reduce hysteresis in multilayer ceramic actuator by connecting the actuator with a capacitor in a series circuit. The change in hysteresis with respect to the capacitor was examined. 0.2Pb(Mg_(1/3)Nb_(2/3)) O_3-0.8Pb(Zr_(0.475)Ti_(0.525))O_3 ceramic material was used as a piezoelectric material for the actuator. Displacement of the actuator was measured in a capacitive gap sensor measuring system. In case of inserting a capacitor in a total circuit, hysteresis became dramatically decreased, and then finally the hysteresis value can be reduced below 0.2 percent. It was found in this present study that reducing the hysteresis in the actuator is dependent upon the characteristics of the capacitor in total circuit and also operating frequency.