PRECISE POSITION CONTROL OF ULTRASONIC MOTOR USING FUZZY CONTROL WITH DEAD-ZONE COMPENSATION
Li Huafeng – Zhao Chunsheng –Gu Chenglin
The ultrasonic motor has a heavy non-linearity and time-varying characteristics which vary with driving conditions. Besides, it possesses a variable dead-zone in the control input. These are problems for accurate actuator positioning in industrial applications. Therefore, it is important to compensate the non- linearity and time-varying characteristic and eliminate the dead-zone in order to improve the control performance. A precise position control scheme for ultrasonic motor using fuzzy controller with dead-zone compensation to control the phase difference of the driving voltages is presented in this paper. The principle and construction of the fuzzy-controller is analyzed and the design method is proposed.
Keywords: ultrasonic motors, position control, fuzzy control, dead-zone compensation