Frequency adaptive control technique for rejecting periodic runout

This paper proposes a novel adaptive controller for rejecting the periodic runout of a track-following system in the compact disk drive (CDD) with dual actuators. The control objective is to attenuate adaptively the specific frequency contents of runout disturbances without amplifying its rest harmonics. This controller can be implemented in a plug-in manner to an existing feedback control system without changing the original control setup. It is applicable to both the spindle modes of constant linear and constant angular velocity for various operation speeds. The experimental results show that the novel control strategy leads to a satisfactory performance in terms of the reduction of tracking error of CDDs.