Patents by Inventor Mitujiro Sawamura

Mitujiro Sawamura 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).

  • Electric motor pole position sensing method, pole position sensing apparatus, and electric motor control apparatus using the same
    Patent number: 7190130
    Abstract: It is an object of the invention to provide a method which can detect a magnetic pole position easily and surely by using high-frequency currents such as harmonics of an inverter output and carrier frequency components. The invention provides a method of detecting a magnetic pole position of a motor and an apparatus for detecting a magnetic pole position in which, although high-frequency currents of carrier frequency components or the like are used, a special current detecting circuit is not required, and synchronization between the current detection timing and the position calculation can be easily attained, and also to provide an apparatus for controlling a motor using the same.
    Type: Grant
    Filed: August 5, 2002
    Date of Patent: March 13, 2007
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Mengesha Mamo Wogari, Kozo Ide, Mitujiro Sawamura
  • Electric motor pole position sensing method, pole position sensing apparatus, and electric motor control apparatus using the same
    Publication number: 20040232862
    Abstract: It is an object of the invention to provide a method which can detect a magnetic pole position easily and surely by using high-frequency currents such as harmonics of an inverter output and carrier frequency components.
    Type: Application
    Filed: February 6, 2004
    Publication date: November 25, 2004
    Inventors: Mengesha Mamo Wogari, Kozo Ide, Mitujiro Sawamura