Track following transducer position control system for a disk storage

Abstract

A position control system for a disk storage drive system which includes a data transducer for recording and playback of the information stored in a desired data track of an information storage disk having a plurality of data storage tracks thereon, includes: a driver unit for actuating the data transducer; a position encoder of detecting a variation in movement of the data transducer and for producing a current position signal thereof; a tracking error detector for producing a tracking error signal upon detecting a positional difference of the data transducer from the desired data track; a track deflection estimator for estimating a deflection of track resulting from either eccentricity or undulation of the data track and for generating a feed-forward signal based on the estimation, and a discrete-time control loop for controlling the driver unit in accordance with the tracking error signal. The discrete-time control loop includes a compensating position calculator for calculating a compensating position command signal from the tracking error signal and an interpolation calculator for generating an interpolation signal which is supplied to the driver unit through interpolation with the feed-forward signal and the compensating position command signal so that the tracking error between the data transducer and the data track can be minimized and the traceability can be improved.