A minimum time seek controller for a disk drive

Author

Patten, W.N. ; Wu, H.C. ; White, L.

Author_Institution

Sch. of Aerosp. & Mech. Eng., Oklahoma Univ., Norman, OK, USA

Volume

31

Issue

3

fYear

1995

fDate

5/1/1995 12:00:00 AM

Firstpage

2380

Lastpage

2387

Abstract

A time optimal controller design is proposed for the purpose of steering the read/write head of a magnetic disk drive during a seek manuever. The design includes the development of a switch-on-time (SOT) open loop slew control using a third order model of the voice coil motor. The SOT algorithm employs a look up table of switch times versus angle. A perturbation correction stage is included to tailor the switch times to adjust for variations in the operating characteristic of the disk drive (due, for example to heat buildup, wear, etc.). The design also includes a terminal stage servo control that employs an optimal feedback/feedforward controller which is used to provide precise positioning at the end of the seek maneuver

Keywords

hard discs; magnetic heads; servomechanisms; table lookup; time optimal control; disk drive; look up table; minimum time seek controller; operating characteristic; optimal feedback/feedforward controller; perturbation correction stage; read/write head; switch-on-time open loop slew control; terminal stage servo control; third order model; time optimal controller design; voice coil motor; Actuators; Coils; Disk drives; Inductance; Magnetic heads; Magnetosphere; Open loop systems; Optimal control; Power system modeling; Switches;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.376221

Filename

376221