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HDD dual-stage servo-controller design using aμ-analysis tool

Authors
Publisher
Elsevier Ltd
Publication Date
Volume
12
Issue
3
Identifiers
DOI: 10.1016/s0967-0661(03)00061-3
Keywords
  • Actuators
  • Coarse–Fine Control
  • Digital Control
  • Robust Control
  • Servo-Systems
  • Structured Singular Value
Disciplines
  • Mathematics

Abstract

Abstract A simple tool for assessment of the closed-loop performance of a linear standard dual-stage controller for track following in hard-disc drives (HDD) is presented. For this reason, a μ-control analysis problem is posed so that the uncertainty of the voice-coil-motor (VCM) actuator and of the secondary actuator can be considered while raising a performance constraint for the sensitivity magnitude. The algebraic formula for the resulting μ-control analysis problem is readily calculated and allows the computation of the amplitude of a worst case sensitivity frequency response for explicit evaluation of the prospective robust control performance. The validity of the approach is verified for a practical example using a HDD-system with piezoelectric secondary actuator.

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