Eccentricity compensation apparatus based on frequency response characteristics of actuator of disk drive servo system

摘要

An eccentricity compensating apparatus for a disk drive servo system using the frequency response characteristics of an actuator (200) for actuating a head to a position on a disk to read data on or reproduce data from the disk, the apparatus including: an error detector (210) that detects a position error between a reference head position and an actual position of the head on the disk; a first compensation controller (220) that receives the position error from the error detector and changes the actual position of the head in order to compensate for the position error; a second compensation controller (230) that generates and outputs a control value to compensate for eccentricity which varies depending on the phase of a spindle that rotates the disk; and a gain/phase adjuster (240) that adjusts the gain and phase of the control value output from the second compensation controller according to a disk reproduction speed, wherein a drive signal of the actuator (200) is obtained by summing together signals output from the first compensation controller and the gain/phase adjuster. The eccentricity compensation apparatus can simply compensate for eccentricity at varying reproduction speeds by adjusting control data estimated for eccentricity compensation at specific reproduction speed based on the frequency response characteristics of an actuator. IMAGE