Patents by Inventor Mitsunori Yamashina

Mitsunori Yamashina 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).

  • Rotating electric machine and cooling method thereof
    Patent number: 6936939
    Abstract: A rotating electric machine having a plurality of ventilating passages formed between a stator frame and a stator iron core and coolers which cool a coolant being provided in the plurality of the ventilating passages. A ventilating circuit in which at least a portion of the coolant which is cooled by one of the coolers is further cooled by another of the coolers, and is allowed to flow to a central portion in an axial direction of the stator iron core in a direction from an outer peripheral side to an inner peripheral side of the stator iron core at least via one ventilating passage of the plurality of ventilating passage which communicates with the central portion in the axial direction of the stator iron core.
    Type: Grant
    Filed: April 9, 2004
    Date of Patent: August 30, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Kazumasa Ide, Kenichi Hattori, Akiyoshi Komura, Yoko Yamashina, Tadashi Sonobe, Akitomi Semba, Junji Sato, Ryoichi Shiobara, Mitsunori Yamashina
  • Rotating electric machine and cooling method thereof
    Publication number: 20040189110
    Abstract: A rotating electric machine having a plurality of ventilating passages formed between a stator frame and a stator iron core and coolers which cool a coolant being provided in the plurality of the ventilating passages. A ventilating circuit in which at least a portion of the coolant which is cooled by one of the coolers is further cooled by another of the coolers, and is allowed to flow to a central portion in an axial direction of the stator iron core in a direction from an outer peripheral side to an inner peripheral side of the stator iron core at least via one ventilating passage of the plurality of ventilating passage which communicates with the central portion in the axial direction of the stator iron core.
    Type: Application
    Filed: April 9, 2004
    Publication date: September 30, 2004
    Inventors: Kazumasa Ide, Kenichi Hattori, Akiyoshi Komura, Mitsunori Yamashina, Tadashi Sonobe, Akitomi Semba, Junji Sato, Ryoichi Shiobara, Yoko Yamashina
  • Rotating electric machine
    Patent number: 6737768
    Abstract: A rotating electric machine having a plurality of ventilating passages formed between a stator frame and a stator iron core, a cooler which cools a coolant is provided at least in one ventilating passage, communicating with a central portion of the stator iron core, of the plurality of ventilating passages, and a ventilating circuit in which the coolant cooled by the cooler is allowed to flow to the central portion of the stator iron core in a direction from an outer peripheral side to an inner peripheral side of the stator iron core via the at least one ventilating passage which communicates with the central portion of the stator iron core.
    Type: Grant
    Filed: July 26, 2001
    Date of Patent: May 18, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Kazumasa Ide, Kenichi Hattori, Akiyoshi Komura, Mitsunori Yamashina, Tadashi Sonobe, Akitomi Semba, Junji Sato, Ryoichi Shiobara
  • Dynamo-electric machine
    Patent number: 6724107
    Abstract: A rotating electric machine exhibits a substantially level axial temperature rise distribution by supplying a coolant which is sufficiently cooled to a central portion of an iron core which is most distant from each of the axial ends of the iron core. A plurality of ventilating passages, which continuously extend in the peripheral direction, are provided in the axial direction between a stator frame and a stator iron core, and coolers are provided in the ventilating passages. A coolant boosted by a booster is cooled by the coolers and is allowed to flow to a central portion of the stator iron core in the direction from the outer peripheral side to the inner peripheral side of the stator iron core via ventilating passages which communicate with the central portion of the stator iron core.
    Type: Grant
    Filed: March 31, 2000
    Date of Patent: April 20, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Kazumasa Ide, Kenichi Hattori, Akiyoshi Komura, Mitsunori Yamashina, Tadashi Sonobe, Akitomi Semba, Junji Sato, Ryoichi Shiobara
  • Rotating electric machine and cooling method thereof
    Publication number: 20030020339
    Abstract: A rotating electric machine having a plurality of ventilating passages formed between a stator frame and a stator iron core, a cooler which cools a coolant is provided at least in one ventilating passage, communicating with a central portion of the stator iron core, of the plurality of ventilating passages, and a ventilating circuit in which the coolant cooled by the cooler is allowed to flow to the central portion of the stator iron core in a direction from an outer peripheral side to an inner peripheral side of the stator iron core via the at least one ventilating passage which communicates with the central portion of the stator iron core.
    Type: Application
    Filed: July 26, 2001
    Publication date: January 30, 2003
    Inventors: Kazumasa Ide, Kenichi Hattori, Akiyoshi Komura, Mitsunori Yamashina, Tadashi Sonobe, Akitomi Semba