Reduced acoustic noise during spin-up by driving a spindle...

Details Reduced acoustic noise during spin-up by driving a spindle... Reduced acoustic noise during spin-up by driving a spindle...

2008-06-26

2011-11-08

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S400110, C318S400120, C318S400320, C318S254100

Reexamination Certificate

active

08054022

ABSTRACT:
A disk drive is disclosed comprising a disk, a head actuated over the disk, and a spindle motor for rotating the disk, wherein the spindle motor comprises a plurality of windings. During a spin-up operation of the disk, a sinusoidal driving signal is applied to each winding of the spindle motor for a spin-up interval, wherein during at least eighty percent of the spin-up interval the sinusoidal driving signals are applied to the windings of the spindle motor open loop.

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