Patents by Inventor Hiroki Nakagawara

Hiroki Nakagawara 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).

  • Magnet embedded rotor, electric motor using the same rotor, and compressor using the same motor
    Patent number: 8212447
    Abstract: A magnet embedded rotor is provided in which permanent magnets are embedded in the iron core of the rotor at a fixed interval. Notch parts are formed at the first protruding part and both the sides of the first protruding parts on the outer face between salient poles in the iron core of the rotor correspond to the multiple permanent magnets. Non-magnetic parts for preventing the short circuit of magnetic flux are formed at both the edges of the permanent magnets. A bridge part between the non-magnetic parts and the notch parts are narrowed as much as possible to an extent to cause a magnetic saturation, and one or multiple of the second protruding part extending to the direction of the outer face are formed at the notch parts.
    Type: Grant
    Filed: April 11, 2007
    Date of Patent: July 3, 2012
    Assignee: Fujitsu General Limited
    Inventors: Yoshichika Fukuda, Pairoj Patisonticharoen, Yuusuke Kikuchi, Hiroki Nakagawara
  • Magnet Embedded Rotor, Electric Motor Using the Same Rotor, and Compressor Using the Same Motor
    Publication number: 20100166575
    Abstract: A magnet embedded rotor is provided in which permanent magnets are embedded in the iron core of the rotor at a fixed interval. Notch parts are formed at the first protruding part and both the sides of the first protruding parts on the outer face between salient poles in the iron core of the rotor correspond to the multiple permanent magnets. Non-magnetic parts for preventing the short circuit of magnetic flux are formed at both the edges of the permanent magnets. A bridge part between the non-magnetic parts and the notch parts are narrowed as much as possible to an extent to cause a magnetic saturation, and one or multiple of the second protruding part extending to the direction of the outer face are formed at the notch parts.
    Type: Application
    Filed: April 11, 2007
    Publication date: July 1, 2010
    Applicant: FUJITSU GENERAL LIMITED
    Inventors: Yoshichika Fukuda, Pairoj Patisonticharoen, Yuusuke Kikuchi, Hiroki Nakagawara