Study of polarization control model for piezoelectric actuator.
A major deficiency of piezoelectric actuator is that their control accuracy is seriously limited by hysteresis. In this paper, the reason why hysteresis can be reduced by controlling polarization is explained according to the analysis of microscopic polarization mechanism and domain wall theory of piezoelectric actuator. The reason of occurring hysteresis in voltage control mode is also given. Then a control model based polarization is derived. In order to evaluate its effectiveness, the control method based on polarization is realized by controlling the charge of piezoelectric actuator. The experimental results show that the polarization control method is significantly more linear and less hysteresis than the voltage control method.
Ru
Changhai
C
Automation College, Harbin Engineering University, Harbin 150001, People's Republic of China. rchhai@yahoo.com.cn <rchhai@yahoo.com.cn>
Sun
Lining
L