학술논문
Midfrequency Runout Compensation in Hard Disk Drives Via a Time-Varying Group Filtering Scheme
Document Type
Periodical
Author
Source
IEEE Transactions on Magnetics IEEE Trans. Magn. Magnetics, IEEE Transactions on. 44(12):4769-4779 Dec, 2008
Subject
Language
ISSN
0018-9464
1941-0069
1941-0069
Abstract
Conventional add-on feedback filters that are designed to compensate for midfrequency (mid-$f$ ) repeatable runout (RRO) in a hard disk drive (HDD) servo system either have a long filter transient or constitute a large sensitivity hump as well as poor stability margins. This paper presents a novel linear time-varying (LTV) group filtering scheme for the compensation of a few mid- $f$ RRO harmonics. While having a short filter transient that ensures fast disturbance attenuation, the proposed filter does not constitute to any substantial unnecessary sensitivity function gain amplification at the steady state. Simulation and implementation results show the effectiveness of this group filtering scheme.