Title :
Microactuator control for disk drive
Author :
Takaishi, K. ; Imamura, T. ; Mizoshita, Y. ; Hasegawa, S. ; Ueno, T. ; Yamada, T.
Author_Institution :
File Memory Lab., Fujitsu Labs. Ltd., Atsugi, Japan
fDate :
5/1/1996 12:00:00 AM
Abstract :
The nonlinear response of a conventional actuator which depends on the ball-bearing friction is the main factor for determining the high track density of hard disk drives. We cannot get enough servo loop gain in the low-frequency region with a conventional single actuator because of its hysteresis characteristics. We have developed a new planar piezoelectric microactuator which is lightweight and applicable for a hard disk drive. Also we introduced a two-stage servo controller and realized a high servo bandwidth over 1 kHz and enough tracking-error reduction in the low-frequency region
Keywords :
hard discs; microactuators; piezoelectric actuators; servomechanisms; 1 kHz; ball-bearing friction; control; hard disk drive; hysteresis; loop gain; nonlinear response; planar piezoelectric microactuator; track density; tracking error; two-stage servo controller; Actuators; Bandwidth; Disk drives; Friction; Hard disks; Hysteresis; Microactuators; Resonant frequency; Servomechanisms; Transfer functions;
Journal_Title :
Magnetics, IEEE Transactions on
