Patents by Inventor Hisami Akagawa

Hisami Akagawa 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).

  • ROTATION ANGLE DETECTION SYSTEM, ROTATION ANGLE DETECTION METHOD, ROTATION ANGLE DETECTION UNIT, AND SYNCHRONOUS MOTOR CONTROL SYSTEM
    Publication number: 20160116304
    Abstract: The purpose of the present invention is to detect the absolute rotation angle of a rotor in a simple manner. In order to detect the rotation angle of a rotor of a stepping motor including a rotor and a stator winding, a first magnetic sensor (151) having a resolution of 200 steps per mechanical angle of 360 degrees detects the rotation angle of a rotor. An incremental encoder (60) outputs a plurality of types of signals periodically in accordance with the rotation angle of the rotor. A rotation angle acquirer (122) in a controller (102) acquires the absolute rotation angle of the rotor on the basis of the rotor rotation angle detected by the first magnetic sensor (151) and the type of signal output by the incremental encoder (60).
    Type: Application
    Filed: February 6, 2014
    Publication date: April 28, 2016
    Applicant: IAI Corporation
    Inventors: Akira Iwamoto, Hisami Akagawa, Akihiro Yamada