Modified AFC runout cancellation and its influence on track following

Author

Zhang, Jingliang ; Weerasooriya, Siri ; Huang, Tony ; Low, Teck Seng

Author_Institution

Data Storage Inst., Singapore

Volume

1

fYear

1997

fDate

9-14 Nov 1997

Firstpage

35

Abstract

This paper investigates the design and implementation of an adaptive feedforward cancellation (AFC) technique to cancel runout in a hard disk drive. An extension to the AFC, the modified AFC, is proposed to overcome some of the limitations of the AFC scheme. When designed to compensate for one runout frequency, the modified AFC can eliminate the intended harmonic without amplifying the adjacent harmonics. This eases the design of a controller to cancel multiple harmonics. Also, the modified AFC is more robust than the AFC since it improves the phase and gain margins. Simulation and laboratory implementation results are presented to show the performance improvements of the proposed modified AFC

Keywords

adaptive control; compensation; control system analysis; control system synthesis; feedforward; hard discs; harmonics; robust control; control performance improvements; control simulation; hard disk drive; intended harmonic elimination; modified adaptive feedforward cancellation; multiple harmonics cancellation; runout cancellation; runout frequency compensation; Automatic frequency control; Computational modeling; Convergence; Degradation; Hard disks; Memory; Power harmonic filters; Rail to rail outputs; Robustness; Transfer functions;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics, Control and Instrumentation, 1997. IECON 97. 23rd International Conference on

Conference_Location

New Orleans, LA

Print_ISBN

0-7803-3932-0

Type

conf

DOI

10.1109/IECON.1997.670915

Filename

670915