Discrete Robust Anti-Windup to Improve a Novel Dual-Stage Large-Span Track-Seek/Following Method

An application of an advanced anti-windup compensation scheme to a recently developed large-span track-seeking and track-following method for dual-stage actuator systems in hard disk drives (HDDs) is presented. In the original dual-stage servo control approach, micro-actuator saturation was addresse...

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Bibliographic Details
Published in:IEEE transactions on control systems technology 2008-11, Vol.16 (6), p.1342-1351
Main Authors: Herrmann, G., Hredzak, B., Turner, M.C., Postlethwaite, I., Guoxiao Guo
Format: Article
Language:English
Subjects:
Actuators
Anti-windup
Anti-windup (AW) compensation
Applied sciences
Bandwidth
Circle criterion
Compensation
Computer science
control theory
systems
Control system analysis
Control system synthesis
Control systems
Control theory. Systems
Design engineering
Disk drives
dual-stage actuator
Electronics
Exact sciences and technology
Frequency
hard disk drive (HDD) servo-control
Hard disks
Instruments
Memory
Microactuators
Miscellaneous
Robustness
Saturation
Servosystems
Settling
Storage and reproduction of information
Studies
track-seeking/following
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Summary:An application of an advanced anti-windup compensation scheme to a recently developed large-span track-seeking and track-following method for dual-stage actuator systems in hard disk drives (HDDs) is presented. In the original dual-stage servo control approach, micro-actuator saturation was addressed using the Circle Criterion to guide the controller design. However, such an approach does not allow the fine-tuning of seeking and settling speeds and also limits the class of linear controllers for the secondary loop due to the Circle Criterion. Anti-windup compensation removes many of these limitations and improves settling duration, disturbance rejection, recovery from saturation in the secondary actuator loop, and design flexibility. A general anti-windup (AW) compensator is presented in discrete time bringing together a number of AW concepts and results previously given in continuous time. Robustness is taken into account and performance requirements are expressed via frequency weights. The robust performance design is based on an l 2 -optimization approach using linear matrix inequalities (LMIs).
ISSN:1063-6536
1558-0865
DOI:10.1109/TCST.2008.917876