Patents by Inventor Eddy Y. Y. Ho

Eddy Y. Y. Ho 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 switching an AC machine between a drive and a power supply
    Patent number: 6329776
    Abstract: A method and apparatus for transferring an AC machine between non volts per hertz drive and a power supply such as supply mains, or a generator. In a transfer procedure, the motor drive is placed in a quasi-voltage mode prior to transfer to permit the output of the motor drive to be synchronized to the output of the power supply. In capture procedure, the output of the drive is preconditioned based on detected states of the AC machine to synchronize the voltage at the terminals of the AC machine with the output of the drive. During the capture procedure, opening of a contactor is detected by comparing the frequency and/or voltage at the terminals of the AC machine with that of the power supply.
    Type: Grant
    Filed: December 6, 1999
    Date of Patent: December 11, 2001
    Assignee: General Electric Company
    Inventors: Paul S. Bixel, Eddy Y. Y. Ho