Position control method
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorEiji Yokoyama
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Abstract
The present invention provides a control system of following a follow target position. A control system has a disturbance observer for obtaining a disturbance force estimation value and a speed estimation value as estimation values of a disturbance force and a speed as a speed to be controlled by using an actuator control signal cont and a zero follow position which can be observed. Since the disturbance force estimation value and speed estimation value are fed back.
Claims10
A method for controlling a position of a movable part of an actuator which drives an optical pickup to a target position, said method comprising:
- obtaining an estimation value of a disturbance force by a disturbance observer for obtaining said disturbance force based on a position error of said movable part with respect to said target position and an actuator control signal, said disturbance force being defined by subtracting a product of said target position and an inverse of a mechanism characteristic of said actuator from a product of an acceleration disturbance acting on said movable part and a mass of said movable part;
- and
- feeding back said estimation value to an electricity-to-force converting section of said actuator.
A disk drive comprising:
- an optical pickup for focusing a light spot onto an optical disk;
- an actuator for driving said optical pickup in response to a control signal for controlling a position of said optical pickup to a target position;
- and
- a disturbance observer for obtaining a disturbance force defined by subtracting a product of said target position and an inverse of a mechanism characteristic of said actuator from a product of an acceleration disturbance acting on a movable part of said actuator and a mass of said movable part, said disturbance observer obtaining an estimation value of said disturbance force based on a position error of said movable part with respect to said target position and said control signal, wherein
- said estimation value of said disturbance force obtained by said disturbance observer is fed back to said actuator.
Dependencies are inferred from the claim text.