Patents by Inventor Ali Kheymehdooz

Ali Kheymehdooz 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).

  • Method and apparatus for controlling head velocity in a disk drive during ramp load/unload
    Patent number: 7193804
    Abstract: A disk drive controls head velocity during ramp load/unload by measuring voltages across a VCM and a sense resistor in series with the VCM, calculating a back EMF voltage using the VCM and sense resistor voltages, and adjusting the head velocity using the back EMF voltage. An embodiment includes amplifying the VCM and sense resistor voltages, multiplexing the amplified voltages, digitizing the multiplexed voltages and calculating the back EMF voltage in discrete-time based on the digitized voltages. Another embodiment includes selecting between PWM and IR cancellation techniques and calculating the back EMF voltage using the selected technique.
    Type: Grant
    Filed: July 20, 2001
    Date of Patent: March 20, 2007
    Assignee: Maxtor Corporation
    Inventor: Ali Kheymehdooz