Advanced methods for repeatable runout compensation [disc drives]

Author

Sacks, A.H. ; Bodson, M. ; Messner, W.

Author_Institution

Data Storage Syst. Center, Carnegie Mellon Univ., Pittsburgh, PA, USA

Volume

31

Issue

2

fYear

1995

fDate

3/1/1995 12:00:00 AM

Firstpage

1031

Lastpage

1036

Abstract

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%.<>

Keywords

adaptive control; closed loop systems; error compensation; feedforward; magnetic disc storage; position control; self-adjusting systems; adaptive feedforward cancellation; magnetic disc drives; periodic disturbance compensation methods; repeatable runout compensation; repetitive control; tracking precision; Adaptive control; Automatic frequency control; Control systems; Data storage systems; Drives; Geometry; Memory; Programmable control; Rail to rail outputs; Transfer functions;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.364780

Filename

364780