Title :
Dual-stage servo with on-slider PZT microactuator for hard disk drives
Author :
Lou, Yaolong ; Gao, Peng ; Qin, Bin ; Guo, Guoxiao ; Ong, Eng-Hong ; Takada, Akio ; Okada, Kanzo
Author_Institution :
Res. Lab., Sony Electron., Singapore, Singapore
fDate :
9/1/2002 12:00:00 AM
Abstract :
A dual-stage servo system with an on-slider piezoelectric (PZT) microactuator is developed for future high-density hard disk drives. The parallel control scheme is used in servo design with considerations over the stroke limitation and the hysteresis of the microactuator. Experimental results on a spin-stand with a laser Doppler vibrometer as the position sensor demonstrate that the system has a servo bandwidth higher than 4 kHz and has disturbance rejection capability up to near 5 kHz.
Keywords :
Doppler measurement; disc drives; hard discs; lead compounds; measurement by laser beam; microactuators; piezoelectric actuators; position measurement; servomechanisms; vibration measurement; 4 kHz; PZT; PbZrO3TiO3; disturbance rejection capability; dual-stage servo; high-density hard disk drives; hysteresis; laser Doppler vibrometer; magnetic hard disk drives; on-slider PZT microactuator; parallel control scheme; position sensor; servo bandwidth; servo design; spin-stand; stroke limitation; Actuators; Bandwidth; Displacement measurement; Frequency measurement; Hard disks; Magnetic heads; Magnetic hysteresis; Microactuators; Servomechanisms; Vibrometers;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2002.801860
