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Repetitive control for the track-following servo system of an optical disk drive

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3 Author(s)
Jung-Ho Moon ; Corp. Tech. Oper., Samsung Electron. Co. Ltd., Suwon, South Korea ; Moon-Noh Lee ; Myung Jin Chung

Disturbances acting on the track-following servo system of an optical disk drive inherently contain significant periodic components that cause tracking errors of a periodic nature. Such disturbances can be effectively rejected by employing a repetitive controller, which must be implemented carefully in consideration of system stability. Plant uncertainty makes it difficult to design a repetitive controller that will improve tracking performance yet preserve system stability. In this paper, we examine the problem of designing a repetitive controller for an optical disk drive track-following servo system with uncertain plant coefficients. We propose a graphical design technique based on the frequency domain analysis of linear interval systems. This design method results in a repetitive controller that will maintain system stability against all admissible plant uncertainties. We show simulation and experimental results to verify the validity of the proposed design method

Published in:

Control Systems Technology, IEEE Transactions on  (Volume:6 ,  Issue: 5 )

Date of Publication:

Sep 1998

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