Patents by Inventor Yoshihiko Toda

Yoshihiko Toda 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).

  • Ground fault protective apparatus of field windings
    Patent number: 4187525
    Abstract: A resistor, a DC source and a current converter are connected in series between one terminal of the field winding and the ground. When a ground fault occurs on the field winding, it is detected by the output of a voltage detector connected across the resistor or the output of the current converter, and an alarm device is operated. At the same time, another resistor is connected between the other terminal of the field winding and the current converter through a switch, and the magnitude of the ground fault is calculated by the outputs of the voltage detector and of the current converter before and after closure of the switch. When the magnitude of the ground fault is large the generator is disconnected.
    Type: Grant
    Filed: February 21, 1978
    Date of Patent: February 5, 1980
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Yukihiro Nagura, Yoshihiko Toda