Disk drive employing active braking using inductive sense

Details Disk drive employing active braking using inductive sense Disk drive employing active braking using inductive sense

2007-01-02

2007-01-02

Sniezek, Andrew L. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

C360S074100, C318S254100, C318S273000

Reexamination Certificate

active

11134917

ABSTRACT:
A disk drive is disclosed comprising a disk, a head actuated over the disk, and a spindle motor for rotating the disk, the spindle motor comprising a plurality of windings. Disk control circuitry executes a spin-down operation of the spindle motor by estimating an angular position of the spindle motor by applying a voltage to at least one of the windings and evaluating a rise time of current flowing through the winding. The windings are commutated in response to the estimated angular position, and a driving current is applied to the windings to brake the spindle motor.

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