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Repetitive learning control system using disturbance observer for head positioning control system of magnetic disk drives

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2 Author(s)
Hamada, Y. ; Data Storage & Retrieval Syst. Div., Hitachi Ltd., Kanagawa, Japan ; Otsuki, H.

Magnetic disk drives are widely used as data storage devices, and the demand for larger capacity and smaller size is increasing. In order to meet this demand, a head positioning control technique is expected to improve the head positioning accuracy by reducing the tracking error caused by disturbances such as bias-force and repeatable run-out. We have developed a disturbance compensation system that is a learning system which can reduce the repeatable run-out tracking error by updating the compensation table using a disturbance observer. This method has reduced the tracking error to the background noise level of a position error signal

Published in:

Magnetics, IEEE Transactions on  (Volume:32 ,  Issue: 5 )

Date of Publication:

Sep 1996

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