Patents by Inventor Shuzo Mitsui

Shuzo Mitsui 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).

  • Speed control apparatus for elevator
    Patent number: 4629035
    Abstract: A speed control apparatus for an elevator in which a temperature detector for detecting the ambient temperature of an induction motor is disposed, and an arithmetic unit employing a microcomputer is additionally furnished with the function of evaluating the component of temperature rise of a rotor and obtaining the resistance value of the rotor by the use of this component of temperature rise and the temperature detection signal of the temperature detector, to evaluate the optimum instantaneous current command by the use of the temperature-compensated resistance value, whereby the overvoltage and the insufficient torque of the induction motor can be obviated.
    Type: Grant
    Filed: April 24, 1985
    Date of Patent: December 16, 1986
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tooru Tanahashi, Toshiaki Ishii, Shuzo Mitsui