PC-based position error signal generation and servo system for a spinstand

Wong, Wai Ee; Lü, Feng; He, Zhimin; Liu, Jun; Kan, Cheng Mun; Guo, Guoxiao

doi:10.1109/tmag.2005.856304

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Cited by 11 publications

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Enhanced disturbance suppression in sampled-data systems and its application to high density data storage servos

et al. 2006

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Precise servo control systems require strong disturbance rejection capabilities for accurate positioning in the nanometer scale world today. In this paper, we propose an add-on DDO (disturbance decoupling observer) and DDOS (DO with extraneous sensor) for stronger disturbance suppression. Our proposed control methodology uses a nominal plant model and its inverse to reject input and output disturbances simultaneously in sampled-data systems. The plant inverse controller is approximated by tuning a single parameter e. Experimental results on a PZT actuated servo system with air flow of mean speed of 50 m/s corresponding to 15,000 rpm in today's high end hard disk drives show an improvement of 69.2% of 3r PES (position error signal) during track-following.

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