Patents by Inventor Naofumi Sakanashi

Naofumi Sakanashi 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 a magnetic bearing
    Patent number: 5486729
    Abstract: A controller of magnetic bearing controls the rotor speed with a reduced drive current while suppressing the rotor vibration. The controller implements the ABS control, N-cross control, N-straight control and FF control in proper combination in addition to the basic PID control. A computer in the controller determines the activation of each control in accordance with a predetermined table of control plan in response to the detected rotor speed.
    Type: Grant
    Filed: March 5, 1993
    Date of Patent: January 23, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Osami Matsushita, Mitsuho Yoneyama, Naohiko Takahashi, Yasuo Fukushima, Minoru Hiroshima, Tadashi Kaneki, Yoshiaki Abe, Naofumi Sakanashi