Patents by Inventor Tetsukai Kato

Tetsukai Kato 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).

  • Sliding mode control method for a machine having an operating section operatively coupled to a servomotor and wherein a switching variable is determined based on a torsion amount and a torsion speed
    Patent number: 5341078
    Abstract: A sliding mode control method is provided capable of improving the following ability of a control system with respect to a command at the time of change in the operating condition of a machine, and preventing vibration which tends to occur by the action of a spring element of the machine at the time of change in the operating condition. The processor of a servo circuit derives position deviation (.epsilon.) and speed deviation (.epsilon.) based on a command position (.theta.r) and an actual position (.theta.), estimates an torsion amount (.epsilon.n) and torsion speed (.epsilon.n) by effecting observer processing (Steps 100 to 101), and derives a switching variable (s) (102).
    Type: Grant
    Filed: August 23, 1993
    Date of Patent: August 23, 1994
    Assignee: Fanuc Ltd.
    Inventors: Nobutoshi Torii, Ryo Nihei, Tetsukai Kato