Patent ID: 7953502
Filing Date: 2011-05-31
Classification: G11B

Abstract:
1. A position control method for controlling a position of an object to a predetermined position by an actuator, the position control method comprising: suppressing a disturbance based on a feedback loop predefined for multiplying a drive instruction value by a gain as calibrating a loop gain being a gain of a loop characteristic that varies according to a change in characteristics of elements constituting the feedback loop, the drive instruction value being used for correcting a position error between a current position of the object and a target position of the object before and after application of a sine wave disturbance having a predetermined frequency to zero; estimating an angular frequency of disturbance based on the position error; and stopping estimating the angular frequency of disturbance when the loop gain is calibrated and maintaining an angular frequency of disturbance estimated before the loop gain is calibrated.