Patents by Inventor Tosio Kotake

Tosio Kotake 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).

  • Control apparatus for a synchronous machine
    Patent number: 4329637
    Abstract: A shaft torsional oscillation signal of a rotatable torsional system including a rotor of a synchronous machine, at least one rotatable body and a shaft coupling the synchronous machine and the rotatable body, is detected. The shaft torsional oscillation signal with a specific frequency is made to advance the phase thereof by a stabilizing control device. The field voltage of the synchronous machine is so controlled that a sub-synchronous resonance (SSR) of the rotatable torsional system caused by the specific frequency is restrictedly controlled by the shaft torsional signal of the specific frequency phase-advanced.
    Type: Grant
    Filed: April 8, 1980
    Date of Patent: May 11, 1982
    Assignees: Tokyo Denryoku Kabushiki Kaisha, Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Tosio Kotake, Katuaki Watanabe, Kaoru Koyanagi