Midfrequency disturbance suppression via micro-actuator in dual-stage HDDs

In hard disk drives (HDDs), it is difficult for the single-stage servo system to suppress the disturbance within the midfrequency band (1-3 kHz) because of the limited servo bandwidth. This article presents a dual-stage control design using a peak filter to deal with the midfrequency narrow-band dis...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2002-09, Vol.38 (5), p.2189-2191, Article 2189
Main Authors: Daowei Wu, Guoxiao Guo, Chong, T.C.
Format: Article
Language:English
Subjects:
Applied sciences
Attenuation
Bandwidth
Control design
Electronics
Exact sciences and technology
Filters
Hard disks
Magnetic and optical mass memories
Magnetism
Microactuators
Narrowband
Other magnetic recording and storage devices (including tapes, disks, and drums)
Servomechanisms
Storage and reproduction of information
Tracking loops
Transient response
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Description
Summary:In hard disk drives (HDDs), it is difficult for the single-stage servo system to suppress the disturbance within the midfrequency band (1-3 kHz) because of the limited servo bandwidth. This article presents a dual-stage control design using a peak filter to deal with the midfrequency narrow-band disturbances caused by disk flutter or windage. The technique of initializing the states of the peak filter is proposed to preserve the smoothness of transient response when the dual-stage servo loop is switched on from track-seeking to track-following. Experimental results demonstrated that the proposed dual-stage control scheme could effectively suppress the midfrequency disturbance without compromising the settling performance. This method would enhance the disturbance attenuation of the dual-stage servo system for higher track density in HDDs.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2002.801862