Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Reexamination Certificate
2005-08-23
2005-08-23
Jackson, Stephen W. (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
Reexamination Certificate
active
06934135
ABSTRACT:
A disk drive is disclosed comprising a spindle motor for rotating a disk and a voice coil motor (VCM) for actuating a head over the disk. The spindle motor comprises a plurality of windings, and the VCM comprises a voice coil. If the current flowing from a supply voltage exceeds a threshold, the windings are disconnected from the supply voltage, the voice coil is disconnected from the supply voltage, and the first and second ends of the voice coil are connected to ground.
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U.S. Appl. No. 10/210,399, filed Jul. 31, 2002 entitled “Decreasing Spin Up Time in a Disk Drive by Adjusting a Duty Cycle of a Spindle Motor PWM Signal to Maintain Constant Average Input Current”.
Demakis James
Jackson Stephen W.
Shara, Esq. Milad G.
Sheerin, Esq. Howard H.
Western Digital Technologies Inc.
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