Patents by Inventor Hideo Ogata

Hideo Ogata 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).

  • Inverter control apparatus
    Patent number: 5646499
    Abstract: An inverter control apparatus for controlling a command frequency and a command voltage which are supplied to an inverter which then supplies AC power of a desired frequency, accordingly, to an induction motor. The inverter control apparatus receives a requested rotational speed of the motor and an actual rotational speed of the motor is obtained by detecting a frequency of a fluctuation component of a drive current supplied from the inverter to the induction motor. The difference between the requested rotational speed and the actual rotational speed represents a slip amount, which is added to the requested rotational speed to produce a command frequency. The command voltage is set to a voltage acquired when the monitored drive current is at a minimum value.
    Type: Grant
    Filed: August 18, 1995
    Date of Patent: July 8, 1997
    Assignees: Matsushita Electric Industrial Co.,Ltd., Matsushita Refrigeration Company
    Inventors: Yoshiaki Doyama, Keizo Matsui, Yoshiteru Ito, Kaneharu Yoshioka, Hideo Ogata, Izumi Yoshida, Shusaku Watakabe