Patents by Inventor Kazunori Tsutusi

Kazunori Tsutusi 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 of controlling V/F inverter for machines having mechanical braking systems
    Patent number: 5049793
    Abstract: There is disclosed a method of controlling a voltage-to-frequency inverter which controls an induction motor by the use of an open-loop system. The motor drives a machine such as a crane, and is braked by a mechanical brake. When the machine is started or stopped, a low-frequency voltage is supplied to the motor so that the motor may produce a torque necessary to hold the load, until the actuation of the mechanical brake ends completely.
    Type: Grant
    Filed: May 2, 1989
    Date of Patent: September 17, 1991
    Assignee: Kabushiki Kaisha Yasakawa Denki Seisakusho
    Inventors: Koji Tanaka, Kazunori Tsutusi