Patents Assigned to Kabushi Kaisha Toyota Chuo Kenkyusho
  • Method and apparatus for generating an ultra low current plasma arc
    Patent number: 4851636
    Abstract: A method and apparatus for generating a plasma arc used in arc welding, arc transformation hardening, minute working, etc. A plasma gas used for generating a plasma arc includes xenon. A tungsten electrode having a diameter of 0.5 millimeters or less is used. Thus, an extremely low plasma arc current of 0.1 amperes or less can be produced in a stabilized manner.
    Type: Grant
    Filed: September 11, 1987
    Date of Patent: July 25, 1989
    Assignee: Kabushi Kaisha Toyota Chuo Kenkyusho
    Inventors: Hisashi Sugimoto, Goro Watanabe
  • Method of controlling inverter and system therefor
    Patent number: 4477763
    Abstract: Method and system of controlling an inverter are disclosed. A reference rotary magnetic flux as a desired magnetic flux of an AC motor is so determined as to make a uniform rotary motion, an actual magnetic flux of the AC motor is detected, voltage vectors are selected such that a deviation between this reference rotary magnetic flux and the magnetic flux of the AC motor may be a value held within a tolerance, and switching elements of the inverter are on-off controlled so that the voltage vectors thus selected can be obtained.
    Type: Grant
    Filed: July 28, 1983
    Date of Patent: October 16, 1984
    Assignee: Kabushi Kaisha Toyota Chuo Kenkyusho
    Inventors: Katsuhiro Asano, Yuzuru Tsunehiro