Abstract

A dual-stage actuator servo system is a promising solution for very high-density disk drives of the future. The requirements for its transient response and robustness are much tighter than for a single-stage one. In this paper, a new variable structure controller with an optimal and dynamic sliding surface is developed to realize satisfactory track seeking and following. Moreover, the servo system with the controller can adopt parametric uncertainties and time variations, and has strong rejection to external disturbances. Simulation results for the closed-loop system are presented in the paper.

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