Patents by Inventor Kazumitu Hasegawa

Kazumitu Hasegawa 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).

  • Cage-type induction motor for high rotational speeds
    Patent number: 6566778
    Abstract: A rotor 10 has a structure with a rotor core 12 and rotor conductors 14, the rotor core 12 is made of a weakly magnetic substance with a high permeability and a relatively low electrical conductivity, and the rotor conductors 14 are composed of a conducting material with a low permeability and a relatively high electrical conductivity. Also, the rotor core 12 and the rotor conductors 14 are formed into a single body that has an entire-surface with a smooth cylindrical shape. Furthermore, a stator 20 is composed of a plurality of stator sheets 22 laminated in the axial direction and a stator winding 24. Each stator sheet is formed with a closed circular inner ring portion 22a and an outer ring portion 22b, with slots 23 that penetrate the sheets between the ring portions, and the stator winding is housed in the slots.
    Type: Grant
    Filed: August 28, 2000
    Date of Patent: May 20, 2003
    Assignee: Ishikawajima-Harima Heavy Industries Co., Ltd.
    Inventors: Kazumitu Hasegawa, Shinichi Ozaki, Toshio Takahashi, Noriyasu Sugitani