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Disturbance Rejection Control Scheme for Optical Disk Drive Systems

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3 Author(s)
Leyva-Ramos, J. ; Inst. Potosino de Investig. Cienc. y Tecnol., San Luis Potosi, Mexico ; Ortiz-Lopez, M.G. ; Diaz-Saldierna, L.H.

A disturbance rejection control scheme is developed for optical disk drive (ODD) systems. Disturbances acting on these servo systems inherently contain significant periodic components that cause tracking errors of a periodic nature. Such disturbances can be effectively rejected by employing a modified repetitive compensator. The proposed control scheme overcomes the drawback of typical internal-model-based repetitive control schemes, which cancel repeatable disturbances but amplify disturbances at other frequencies. A sufficient stability criterion is developed when the proposed control scheme is used in a closed-loop system. Some practical guidelines are also given for tuning the control scheme. A comparison of the control scheme with and without the modified repetitive compensator shows significant improvement of the tracking performance of the proposed scheme.

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Magnetics, IEEE Transactions on  (Volume:46 ,  Issue: 10 )