Patents by Inventor Tadao Shimotu

Tadao Shimotu 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 induction motor
    Patent number: 4689542
    Abstract: When actuating again an induction motor rotating inertially by applying power to the induction motor from an inverter capable of changing both of its output frequency and output voltage, the power is once supplied to the induction motor to increase the residual voltage if the residual voltage of the induction motor is not sufficient, and the frequency of an initial impressed voltage that is in agreement with the rotating speed of the induction motor is determined.
    Type: Grant
    Filed: September 9, 1985
    Date of Patent: August 25, 1987
    Assignees: Hitachi, Ltd., Hitachi Keiyo Engineering Co., Ltd.
    Inventors: Satoshi Ibori, Tadao Shimotu, Masatomo Yabu
  • Method and apparatus for controlling induction motor
    Patent number: RE33519
    Abstract: When actuating again in induction motor rotating inertially by applying power to the induction motor from an inverter capable of changing both of its output frequency and output voltage, the power is once supplied to the induction motor to increase the residual voltage if the residual voltage of the induction motor is not sufficient, and the frequency of an initial impressed voltage that is in agreement with the rotating speed of the induction motor is determined.
    Type: Grant
    Filed: August 22, 1989
    Date of Patent: January 15, 1991
    Assignees: Hitachi, Ltd., Hitachi Keiyo Engineering Co., Ltd.
    Inventors: Satoshi Ibori, Tadao Shimotu, Masatomo Yabu