Patents by Inventor Angel Yu

Angel Yu 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).

  • Disk drive adjusting gain of spindle motor compensator based on a ratio of spin speeds
    Patent number: 8737008
    Abstract: A disk drive is disclosed comprising a head actuated over a disk, a spindle motor for rotating the disk, and a spindle motor control system comprising a servo compensator operable to generate a control signal applied to the spindle motor, the servo compensator comprising a programmable gain term (PGT). The disk is spun at a first speed RPM—1 using a first value PGT—1 selected for the PGT, and the disk is spun at a second speed RPM—2 using a second value PGT—2 selected for the PGT, wherein the second value PGT—2 is generated in response to the first value PGT—1 scaled by a function of a ratio of RPM—2 to RPM—1.
    Type: Grant
    Filed: May 12, 2011
    Date of Patent: May 27, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventors: Taylor Watanabe, Wenli Yang, Ashok K. Desai, William T. Stoll, Angel Yu