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Robust Servo System for Optical Disk Drive Systems  

Park Bum-Ho (LG전자 DM연구소)
Chung Chung Choo (한양대학교 전자ㆍ전기ㆍ컴퓨터공학부)
Baek Jong-Shik (한양대학교 전자ㆍ통신ㆍ전파공학과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers D / v.54, no.1, 2005 , pp. 1-10 More about this Journal
Abstract
This paper proposes a new and simple input prediction method for robust servo system. A robust tracking control system for optical disk drives was proposed recently based on both Coprime Factorization (CF) and Zero Phase Error Tracking (ZPET) control. The CF control system can be designed simply and systematically. Moreover, this system has not only stability but also robustness to parameter uncertainties and disturbance rejection capability. Since optical disk tracking servo system can detect only tracking error, it was proposed that the reference input signal for ZPET could be estimated from tracking errors. In this paper, we propose a new control structure for the ZPET controller. It requires less memory than the previously proposed method for the reference signal generation. Numerical simulation results show that the proposed method is effective.
Keywords
Optical Disk Drive; Coprime Factorization; Zero Phase Error Tracking; Track-Following Control; Input Prediction System;
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