Patents by Inventor Yoshihiro Ogashi

Yoshihiro Ogashi 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).

  • Variable speed drive system
    Patent number: 4956596
    Abstract: An a.c. variable speed drive system which can switch between a driving operation and regenerative operation of an inverter in accordance with the operation speed.
    Type: Grant
    Filed: October 17, 1989
    Date of Patent: September 11, 1990
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshihiro Ogashi
  • Control system for a power converter for driving induction motors
    Patent number: 4780650
    Abstract: In a control system for a power converter for driving induction motors, the control system separately controlling an exciting current component of the primary current of the induction motors contributing to generation of a magnetic flux and a torque current component of the primary current contributing to generation of a torque, a voltage detecting device detects the output voltage of the power converter, and a correcting device responds to the voltage detecting device for determining a current correction for correcting at least one of the exciting current component and the torque current component to reduce the difference of the detected voltage from a reference value of the output voltage.
    Type: Grant
    Filed: August 20, 1985
    Date of Patent: October 25, 1988
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masanori Miyazaki, Yoshihiro Ogashi