Head actuator velocity control for electrical power off in a disk drive
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United States of America Patent
Stats
-
May 15, 2012
Grant Date -
Jun 17, 2010
app pub date -
Dec 16, 2008
filing date -
Dec 16, 2008
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hard disk drive with a voice coil motor coupled to a head. The head is coupled to a disk that is rotated by a spindle motor. The spindle motor generates a back-emf current. The disk drive also includes a drive circuit that causes the voice coil motor to move the head off of the disk. The drive circuit provides at least a portion of the back-emf voltage to the voice coil motor if a head velocity exceeds a first predetermined value and a larger portion of the back-emf voltage if the head velocity exceeds a second predetermined value. For example, a relatively small amount of voltage can be provided if the head velocity falls below a first threshold to accelerate the head and a larger current can be provided if the head velocity falls below a lower threshold to generate a greater head thrust.
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