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Spindle Motor Phase Fine Slew Rate Control for HDD Disclosure Number: IPCOM000014042D
Original Publication Date: 2001-Nov-17
Included in the Prior Art Database: 2003-Jun-19

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In Hard Disk Drives, one or more disks are mounted on a spindle. The spindle is rotated by an electric motor. The friction force of a rotating spindle can vary depending on many factors. Some factors which affect this friction force are listed here. Head position (over the media or stowed away from the media). Rotational velocity. Number of disks. The slew rate which provides the optimum rotational velocity accuracy and acoustic characteristics may vary with different spindle rotational friction force coefficients.