POSITIONING CONTROL METHOD AND POSITIONING CONTROLLER

Japanese Patent JP3785300

B2

PROBLEM TO BE SOLVED: To prevent the decline of positioning accuracy due to the static friction of the bearing of an actuator relating to positioning control method and device for positioning the actuator at a target position. SOLUTION: This method is provided with a step for generating random wave signals RN, a step for detecting the position deviation amount from the target position of the actuator 3 and preparing servo control signals CV for positioning the actuator 3 at the target position and a step for adding the random wave signals RN to the servo control signals CV and generating control signals. Since a random fine vibration amount is supplied to the actuator all the time and the standstill state of the bearing of the actuator is eliminated, the friction of the actuator becomes only kinetic friction and linear characteristics to a controlled variable are attained. As a result, the positioning accuracy is improved. Since random waves are used, the position accuracy of a servo system is not lowered.