Patents by Inventor Sigeru Machida

Sigeru Machida 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).

  • Torque control apparatus for rotary machine
    Patent number: 4736143
    Abstract: A torque control apparatus for a compressor driven by a motor through a main shaft, in which variations of the rotation speed of the main shaft due to torque variations are detected at selected angular positions of rotation of the main shaft. Current values to be supplied to the motor for eliminating the rotation speed variations depending on the angular positions of rotation of the main shaft are computed and stored during at least one revolution of the main shaft, and, in the next revolution of the main shaft, that is, when the main shaft rotates then to a 360.degree. advanced angular position, the motor current is controlled on the basis of the current values supplied for at least one revolution of the main shaft, thereby eliminaitng variations of the rotation-speed of the main shaft.
    Type: Grant
    Filed: October 6, 1986
    Date of Patent: April 5, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Yozo Nakamura, Mitsuru Nakamura, Sigeru Machida, Tsunehiro Endo, Hiroaki Hata