Patents by Inventor Tetsuya Tsuruta

Tetsuya Tsuruta 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 electric motor
    Patent number: 10797553
    Abstract: The rotor includes an annular permanent magnet, an annular first iron core situated on the inner diameter side of the magnet, an annular second iron core situated on the inner diameter side of the first iron core, an insulating member situated between the first iron core and the second iron core, and a shaft provided along a central axis of the second iron core, the first iron core is provided with a plurality of outer periphery side convex portions protruding from an inner periphery toward the inner diameter side, the second iron core is provided with a plurality of inner periphery side convex portions protruding from an outer periphery toward the outer diameter side, and the outer periphery side convex portions and the inner periphery side convex portions are disposed in positions not overlapping each other when viewed in the radial direction from the axis of the second iron core.
    Type: Grant
    Filed: September 21, 2017
    Date of Patent: October 6, 2020
    Assignee: FUJITSU GENERAL LIMITED
    Inventors: Tetsuya Tsuruta, Masanori Murakami, Shingo Suzuki
  • PERMANENT MAGNET ELECTRIC MOTOR
    Publication number: 20190214875
    Abstract: The rotor includes an annular permanent magnet, an annular first iron core situated on the inner diameter side of the magnet, an annular second iron core situated on the inner diameter side of the first iron core, an insulating member situated between the first iron core and the second iron core, and a shaft provided along a central axis of the second iron core, the first iron core is provided with a plurality of outer periphery side convex portions protruding from an inner periphery toward the inner diameter side, the second iron core is provided with a plurality of inner periphery side convex portions protruding from an outer periphery toward the outer diameter side, and the outer periphery side convex portions and the inner periphery side convex portions are disposed in positions not overlapping each other when viewed in the radial direction from the axis of the second iron core.
    Type: Application
    Filed: September 21, 2017
    Publication date: July 11, 2019
    Applicant: Fujitsu General Limited
    Inventors: Tetsuya TSURUTA, Masanori MURAKAMI, Shingo SUZUKI
  • HOLLOW MEMBER AND METHOD FOR FORMING HOLLOW MEMBER
    Publication number: 20140174610
    Abstract: A tubular hollow member to which torsion about a center line is applied is characterized in performing a partial heat treatment on part of a peripheral wall of the hollow member to make the hardness of an outer portion of the peripheral wall greater than the hardness before heating and greater than the hardness of an inner portion of the peripheral wall, and reduce a residual stress of the inner portion of the peripheral wall.
    Type: Application
    Filed: April 23, 2012
    Publication date: June 26, 2014
    Applicants: FUJI GIKEN CO., LTD., Y-TEC CORPORATION
    Inventors: Takeshi Edahiro, Norifumi Akutagawa, Kyotaro Yamane, Teruhisa Hiraoka, Kazumi Yasuda, Shigeaki Ando, Masaru Hashimoto, Yuichi Ando, Tetsuya Tsuruta