Electricity: motive power systems – Positional servo systems
Reexamination Certificate
2005-12-06
2005-12-06
Duda, Rina (Department: 2837)
Electricity: motive power systems
Positional servo systems
C318S599000, C318S811000, C318S432000, C318S434000, C388S911000
Reexamination Certificate
active
06972539
ABSTRACT:
A disk drive is disclosed comprising a spindle motor comprising a plurality of windings for rotating a disk. The spindle motor is rotated by commutating the windings over a plurality of commutation states, wherein audible noise generated by the disk drive is reduced by phase modulating the commutation interval. Further audible noise reduction is achieved by modulating a current applied to the windings which substantially reduces discontinuities in the torque output of the spindle motor caused by phase modulation of the commutation intervals.
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Codilian Raffi
Ferris Timothy A.
Duda Rina
Sheerin, Esq. Howard H.
Western Digital Technologies Inc.
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