Title :
Compensation for repeatable tracking errors in hard drives using discrete-time repetitive controllers
Author :
Onuki, Yoshikazu ; Ishioka, Hideaki
Author_Institution :
SHD Bus. Dev. Div., Sony Corp., Tokyo, Japan
fDate :
6/1/2001 12:00:00 AM
Abstract :
Presents the repeatable runout (RRO) compensation in hard disk drives (HDDs). To cancel the RRO, we applied repetitive controllers to the tracking system. Through experiments, we obtained a high reduction ratio of from 10 to 45 dB for up to 10th harmonics component of the RRO. Furthermore, by switching filter parameters between the learning state and the steady state, we obtained fast learning of less than two disk rotations
Keywords :
compensation; disc drives; discrete time systems; filtering theory; hard discs; learning systems; position control; transfer functions; discrete-time repetitive controllers; hard disk drives; learning state; repeatable runout compensation; repeatable tracking errors; steady state; Automatic frequency control; Control systems; Disk drives; Error correction; Hard disks; Magnetic heads; Power harmonic filters; Rail to rail outputs; Servomechanisms; Transfer functions;
Journal_Title :
Mechatronics, IEEE/ASME Transactions on
DOI :
10.1109/3516.928726
