Object positioning using discrete sliding mode control with variable parameters
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United States of America Patent
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Apr 4, 2000
Grant Date -
N/A
app pub date -
Jul 29, 1997
filing date -
Apr 30, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
Apparatus and method for improving vibration and mechanical shock response of a system through the use of discrete-time sliding mode control with variable parameters are disclosed. A servo circuit for positioning a control object (such as a head of a disc drive) includes a reference generator generating position and velocity references, an observer generating position and velocity estimates, and circuitry for determining position and velocity errors therefrom. Variable position and velocity gains are applied to the position and velocity errors, respectively, the position and velocity gains varying with respect to at least the magnitudes of the position errors.
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