HYSTERESIS FREE-CHARACTERISTICS IN CERAMIC MULTILAYER ACTUATOR DRIVEN BY A CHARGE CONTROL METHOD
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%. 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.
Keywords: Ceramic multilayer actuator; charge control; frequency dependent characteristics; hysteresis-free displacement
Document Type: Research Article
Affiliations: Electric and Magnetic Devices Research Group, Korea Electrotechnology Research Institute, Changwon, 641-120, Korea
Publication date: 01 January 2006
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