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Advanced methods for repeatable runout compensation [disc drives]

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3 Author(s)
Sacks, A.H. ; Data Storage Syst. Center, Carnegie Mellon Univ., Pittsburgh, PA, USA ; Bodson, M. ; Messner, W.

This paper presents and compares experimental results from two types of periodic disturbance compensation methods. The repeatable runout (RRO) cancellation techniques studied in this paper are adaptive feedforward cancellation (AFC) and repetitive control. Two modifications (phase advance and a feedthrough term) to the basic AFC structure are also studied experimentally. Of the AFC methods, the feedthrough technique is superior, but the repetitive controller provides better RRO rejection. Overall it is found that the removal of repeatable runout improved the tracking precision by as much as 53%.<>

Published in:

Magnetics, IEEE Transactions on  (Volume:31 ,  Issue: 2 )

Date of Publication:

March 1995

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