Patents by Inventor David D. T. Nguyen

David D. T. Nguyen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Seek distance dependent variable max VCM seek current to control thermal rise in VCM's
    Patent number: 6724564
    Abstract: A disk drive and methods for preventing a coil in a voice coil motor from overheating due to the application of excess current. The disk drive comprises a servo control system. The servo control system is adapted for applying a current to a coil of the voice coil motor thereby causing the voice coil motor to move the head according to a seek distance. The servo control system generates a plurality of seek profiles for each of a plurality of seek distances and a plurality of current limits for the plurality of seek profiles. Each of the plurality of seek profiles defines a plan for controlling the current to be applied to the coil while the voice coil motor is operated over the seek distance. The plurality of current limits each define a maximum current allowed while controlling the current to be applied to the coil.
    Type: Grant
    Filed: November 30, 2000
    Date of Patent: April 20, 2004
    Assignee: Western Digital Technologies, Inc.
    Inventors: Raffi Codilian, David D. T. Nguyen, David L. Whitaker