Digital servo control of a novel disk actuator

Author

Sri-Jayantha, M. ; Chainer, T.J. ; Brown, D.H.

Author_Institution

IBM Thomas J. Watson Res. Center, Yorktown Heights, NY, USA

Volume

27

Issue

6

fYear

1991

fDate

11/1/1991 12:00:00 AM

Firstpage

4476

Lastpage

4483

Abstract

A novel disk actuator transported on parallel flexures is considered for digital servo control. The control scheme derives the state estimates from a position error signal which resembles a sawtooth wave form. The estimator is based on a second-order actuator model with two augmented states for both track-following and track-access modes. The structure of the track-following controller is of a proportional-integral-derivative type. The estimator´s residue time history shows that the algorithms are sufficiently robust to accommodate the model uncertainty, measurement noise, and force disturbance that are associated with a disk drive mechanism. The performance characteristics of the actuator are presented in terms of transfer functions, a step input response, a track misregistration probability distribution function, and 1/3 stroke seek dynamics

Keywords

digital control; electric actuators; magnetic disc storage; position control; servomechanisms; step response; three-term control; transfer functions; 1/3 stroke seek dynamics; augmented states; digital servo control; disk actuator; disk drive mechanism; force disturbance; measurement noise; parallel flexures; position error signal; proportional-integral-derivative type; residue time history; second-order actuator model; state estimates; step input response; track misregistration probability distribution function; track-access modes; track-following controller; transfer functions; uncertainty; Actuators; Error correction; Force measurement; History; Measurement uncertainty; Noise robustness; Pi control; Proportional control; Servosystems; State estimation;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.278667

Filename

278667