Discrete-time LQG/LTR dual-stage controller design in magnetic disk drives

This paper presents a new dual feedback loop controller design of a dual-stage actuator for hard disk drives. For precise and accurate displacement, coupled dynamic model is considered from the Newton-Euler formulation. A gain factor is introduced so that the level of microactuator's contributi...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2001-07, Vol.37 (4), p.1891-1895
Main Authors: SUH, Sang-Min, CHUNG CHOO CHUNG, LEE, Seung-Hi
Format: Article
Language:English
Subjects:
Actuators
Applied sciences
Bandwidth
Control systems
Design engineering
Disk drives
Dynamical systems
Electronics
Exact sciences and technology
Feedback loop
Frequency
Gain
High frequencies
Magnetic and optical mass memories
Magnetism
Mathematical models
Microactuators
Other magnetic recording and storage devices (including tapes, disks, and drums)
Servomechanisms
Settling
Sliding mode control
Storage and reproduction of information
Transient response
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Summary:This paper presents a new dual feedback loop controller design of a dual-stage actuator for hard disk drives. For precise and accurate displacement, coupled dynamic model is considered from the Newton-Euler formulation. A gain factor is introduced so that the level of microactuator's contribution and the high frequency characteristics of the system can be controlled. 2.28 kHz servo bandwidth is achieved. The 6 percent settling time is 250 /spl mu/s and 3/spl sigma/ value is 0.017 /spl mu/m from the experimental result.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.951000