Abstract: A target moving distance of an actuator is provided and a acceleration time of the actuator suitable for the target moving distance are calculated on the basis of a preset equation. Then, a starting position of the actuator is set. It is judged if the starting position is in the range where an unevenness of force of the actuator occurs. When the starting position is not in the range, the actuator is shifted to the starting position and then is accelerated for the acceleration time. On the other hand, when the starting position is in the range, a correction time to the acceleration time is obtained based on a fuzzy inference calculation and added to the acceleration time. The actuator is shifted to the starting position and accelerated for a corrected acceleration time which is obtained by the fuzzy inference calculation.

Abstract: A method and apparatus for high speed, high precision control of an actuator. An initializing process sets control signals for moving the actuator a set of predetermined distances using fuzzy logic. Control of actuator movement is then performed using these predetermined set control signals and their corresponding distances. Movement of the actuator to target distance lying between the control signal distances are achieved by an interpolation operation using fuzzy logic.

Abstract: A position control system is disclosed for positioning a stepping motor to a target position according to a closed loop control system. The closed loop control system controls the position of the stepping motor according to a current position signal outputted from an encoder operatively coupled to the stepping motor. Furthermore, circuitry is provided for correcting electrically a torque angle error of the stepping motor caused by a positional error between the stepping motor and the encoder due to a mechanical mounting error of the encoder, to thereby drive the stepping motor at a torque angle maintained at the most desirable range.