Patents by Inventor Mutsuo Tomita

Mutsuo Tomita 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).

  • Permanent magnet rotating machine
    Patent number: 7906882
    Abstract: Permanent magnets 52a1, 52a2 are inserted into magnet insert holes 51a1, 51a4 formed in a main magnetic pole 50A of a rotor 50. An outer circumferential surface of the rotor includes a first outer circumferential surface portion 50a which intersects with a d-axis and second outer circumferential surface portions 50da, 50ab which intersect with a q-axis. A radius R2 of curvature of the second outer circumferential surface portions 50da, 50ab is larger than a radius of curvature of the first outer circumferential surface portions 50a. Recesses 50a1, 50a2 are formed in the second outer circumferential surface portions 50da, 50ab and in a position to face end walls 51a2, 51a5 of the magnet insert holes 51a1, 51a4 which are adjacent to the outer circumferential surface of the rotor.
    Type: Grant
    Filed: September 8, 2009
    Date of Patent: March 15, 2011
    Assignee: Aichi Elec Co.
    Inventors: Shigeru Okuma, Shinji Doki, Mutsuo Tomita, Mitsuhiko Sato, Seiichi Kaneko
  • PERMANENT MAGNET ROTATING MACHINE
    Publication number: 20100001607
    Abstract: Permanent magnets 52a1, 52a2 are inserted into magnet insert holes 51a1, 51a4 formed in a main magnetic pole 50A of a rotor 50. An outer circumferential surface of the rotor includes a first outer circumferential surface portion 50a which intersects with a d-axis and second outer circumferential surface portions 50da, 50ab which intersect with a q-axis. A radius R2 of curvature of the second outer circumferential surface portions 50da, 50ab is larger than a radius of curvature of the first outer circumferential surface portions 50a. Recesses 50a1, 50a2 are formed in the second outer circumferential surface portions 50da, 50ab and in a position to face end walls 51a2, 51a5 of the magnet insert holes 51a1, 51a4 which are adjacent to the outer circumferential surface of the rotor.
    Type: Application
    Filed: September 8, 2009
    Publication date: January 7, 2010
    Applicant: AICHI ELEC CO.
    Inventors: Shigeru OKUMA, Shinji DOKI, Mutsuo TOMITA, Mitsuhiko SATO, Seiichi KANEKO
  • Permanent magnet rotating machine
    Patent number: 7605510
    Abstract: Permanent magnets 52a1, 52a2 are inserted into magnet insert holes 51a1, 51a4 formed in a main magnetic pole 50A of a rotor 50. An outer circumferential surface of the rotor includes a first outer circumferential surface portion 50a which intersects with a d-axis and second outer circumferential surface portions 50da, 50ab which intersect with a q-axis. A radius R2 of curvature of the second outer circumferential surface portions 50da, 50ab is larger than a radius of curvature of the first outer circumferential surface portions 50a. Recesses 50a1, 50a2 are formed in the second outer circumferential surface portions 50da, 50ab and in a position to face end walls 51a2, 51a5 of the magnet insert holes 51a1, 51a4 which are adjacent to the outer circumferential surface of the rotor.
    Type: Grant
    Filed: November 27, 2006
    Date of Patent: October 20, 2009
    Assignee: Aichi Elec Co.
    Inventors: Shigeru Okuma, Shinji Doki, Mutsuo Tomita, Mitsuhiko Sato, Seiichi Kaneko
  • PERMANENT MAGNET ROTATING MACHINE
    Publication number: 20070126305
    Abstract: Permanent magnets 52a1, 52a2 are inserted into magnet insert holes 51a1, 51a4 formed in a main magnetic pole 50A of a rotor 50. An outer circumferential surface of the rotor includes a first outer circumferential surface portion 50a which intersects with a d-axis and second outer circumferential surface portions 50da, 50ab which intersect with a q-axis. A radius R2 of curvature of the second outer circumferential surface portions 50da, 50ab is larger than a radius of curvature of the first outer circumferential surface portions 50a. Recesses 50a1, 50a2 are formed in the second outer circumferential surface portions 50da, 50ab and in a position to face end walls 51a2, 51a5 of the magnet insert holes 51a1, 51a4 which are adjacent to the outer circumferential surface of the rotor.
    Type: Application
    Filed: November 27, 2006
    Publication date: June 7, 2007
    Applicant: AICHI ELEC CO.
    Inventors: Shigeru OKUMA, Shinji DOKI, Mutsuo TOMITA, Mitsuhiko SATO, Seiichi KANEKO