A phase-stabilized servo controller for dual-stage actuators in hard disk drives

Author

Kobayashi, Masahito ; Nakagawa, Shinsuke ; Nakamura, Shigeo

Author_Institution

Mech. Eng. Res. Lab., Hitachi Ltd., Ibaraki, Japan

Volume

39

Issue

2

fYear

2003

fDate

3/1/2003 12:00:00 AM

Firstpage

844

Lastpage

850

Abstract

A phase-stabilized servo controller was developed based on a Nyquist plot for moving-suspension dual-stage actuators. The controller uses the suspension resonances of a PZT microactuator to compensate for the track misregistration (TMR) due to windage disturbance caused by suspension vibration. Experimental results obtained using a prototype 3.5-in hard disk drive show that the crossover frequency of the open loop is 2.0 kHz, and that the root mean square of the TMR due to windage disturbance is reduced by 23% compared to that of a conventional notch-based dual-stage controller.

Keywords

disc drives; hard discs; lead compounds; piezoelectric actuators; servomechanisms; stability; vibrations; 2.0 kHz; 3.5 in; Nyquist plot; PZT; crossover frequency; dual-stage actuators; hard disk drive; hard disk drives; moving-suspension dual-stage actuators; open loop; phase-stabilized servo controller; root mean square; suspension resonances; suspension vibration; track misregistration; windage disturbance; Actuators; Frequency; Hard disks; Microactuators; Open loop systems; Prototypes; Resonance; Root mean square; Servomechanisms; Vibration control;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2003.808938

Filename

1190112