Digital servo control system for a hard disc drive using a voice coil motor in voltage mode
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United States of America Patent
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Jun 15, 2004
Grant Date -
Aug 22, 2002
app pub date -
Dec 3, 2001
filing date -
Dec 15, 2000
priority date (Note) -
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Abstract
This invention comprises an architecture for voltage mode control of a voice coil motor in a hard disk drive. In contrast to conventional current mode control, coil current is not sensed or measured, which simplifies the feedback design with less hardware required in the implementation. Common design methodologies for the square root velocity profile, linear velocity profile and regulator/estimator control system designs can be migrated from the current mode architecture to the voltage mode architecture.
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