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

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Abstract

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 ɛ. 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 3σ PES (position error signal) during track-following.

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Authors and Affiliations

  1. A*STAR Data Storage Institute, No. 5, Engineering Drive 1, Singapore, Singapore, 117608

    Chee Khiang Pang & Guoxiao Guo

  2. Department of Electrical and Computer Engineering, National University of Singapore, Singapore, Singapore

    Chee Khiang Pang, Ben M. Chen & Tong Heng Lee

Authors
  1. Chee Khiang Pang
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  2. Guoxiao Guo
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  3. Ben M. Chen
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  4. Tong Heng Lee
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Correspondence to Chee Khiang Pang.

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Pang, C.K., Guo, G., Chen, B.M. et al. Enhanced disturbance suppression in sampled-data systems and its application to high density data storage servos. Microsyst Technol 13, 911–921 (2007). https://doi.org/10.1007/s00542-006-0302-0

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  • DOI: https://doi.org/10.1007/s00542-006-0302-0

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