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Data storage device optimizing spindle motor power when transitioning into a power failure mode

  • US 9,761,266 B2
  • Filed: 01/04/2016
  • Issued: 09/12/2017
  • Est. Priority Date: 12/23/2014
  • Status: Active Grant
First Claim
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1. A data storage device comprising:

  • a disk;

    a spindle motor configured to rotate the disk, wherein the spindle motor comprises a plurality of windings;

    a head actuated over the disk; and

    control circuitry powered by a supply voltage, the control circuitry configured to;

    commutate the windings based on a commutation sequence while applying a driving voltage to each winding, wherein the driving voltage comprises an operating polarity during normal operation; and

    when the supply voltage falls below a threshold while the spindle motor is rotating the disk, configure the spindle motor into a power generator by at least reversing the polarity of the driving voltage for an interval and then reversing the polarity of the driving voltage back to the operating polarity.

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