Title :
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
fDate :
3/1/2003 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.808938
