Patents by Inventor Takuhito Miyajima

Takuhito Miyajima 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).

  • Stator iron core of electric motor, manufacturing method thereof, electric motor, and compressor
    Patent number: 6858964
    Abstract: A stator iron core of an electric motor including plural magnetic pole segments. Each of the pole segments include a back yoke portion, a teeth portion projected from the back yoke portion, a connection portion provided to the back yoke portion for connecting adjacent magnetic pole segments, and a stepped-shaped notch on an outer circumference of the back yoke portion. Further, the stator iron core is circularly formed by bending the connection portions of the plural magnetic pole segments.
    Type: Grant
    Filed: September 20, 2002
    Date of Patent: February 22, 2005
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kouji Masumoto, Tomoaki Oikawa, Tsuneyoshi Tajima, Osamu Kazama, Masaki Kato, Toshio Arai, Takuhito Miyajima, Hiroyuki Akita
  • Stator iron core of electric motor, manufacturing method thereof, electric motor, and compressor
    Patent number: 6856064
    Abstract: A stator iron core of an electric motor including plural magnetic pole segments connected and confronted by plural confronting surfaces. Further, two of the confronting surfaces respectively include a V-shaped projection and a V-shaped recess.
    Type: Grant
    Filed: September 20, 2002
    Date of Patent: February 15, 2005
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kouji Masumoto, Tomoaki Oikawa, Tsuneyoshi Tajima, Osamu Kazama, Masaki Kato, Toshio Arai, Takuhito Miyajima, Hiroyuki Akita
  • Stator iron core of electric motor, manufacturing method thereof, electric motor, and compressor
    Publication number: 20030020359
    Abstract: The present invention aims to provide a stator iron core of an electric motor which can eliminate the reduction of efficiency, vibration or noise of the electric motor by decreasing stress generated at a bottom portion of a slot on manufacturing or integrating the electric motor. Plural magnetic pole segments, each having a back yoke portion and a teeth portion projected from the back yoke portion, are connected so as to be bendable via a connection portion provided to the back yoke portion. After winding the coil wire, a stator iron core of the electric motor is circularly formed by bending the connection portion of the plural magnetic pole segments. In the stator iron core, the bottom portion of the slot constituted by the back yoke portion and the teeth portion is made to have a curved line after the stator iron core is circularly formed.
    Type: Application
    Filed: September 20, 2002
    Publication date: January 30, 2003
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Kouji Masumoto, Tomoaki Oikawa, Tsuneyoshi Tajima, Osamu Kazama, Masaki Kato, Toshio Arai, Takuhito Miyajima, Hiroyuki Akita
  • Stator iron core of electric motor, manufacturing method thereof, electric motor, and compressor
    Publication number: 20030020358
    Abstract: The present invention aims to provide a stator iron core of an electric motor which can eliminate the reduction of efficiency, vibration or noise of the electric motor by decreasing stress generated at a bottom portion of a slot on manufacturing or integrating the electric motor. Plural magnetic pole segments, each having a back yoke portion and a teeth portion projected from the back yoke portion, are connected so as to be bendable via a connection portion provided to the back yoke portion. After winding the coil wire, a stator iron core of the electric motor is circularly formed by bending the connection portion of the plural magnetic pole segments. In the stator iron core, the bottom portion of the slot constituted by the back yoke portion and the teeth portion is made to have a curved line after the stator iron core is circularly formed.
    Type: Application
    Filed: September 20, 2002
    Publication date: January 30, 2003
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Kouji Masumoto, Tomoaki Oikawa, Tsuneyoshi Tajima, Osamu Kazama, Masaki Kato, Toshio Arai, Takuhito Miyajima, Hiroyuki Akita
  • Stator iron core of electric motor, manufacturing method thereof, electric motor, and compressor
    Publication number: 20010030483
    Abstract: The present invention aims to provide a stator iron core of an electric motor which can eliminate the reduction of efficiency, vibration or noise of the electric motor by decreasing stress generated at a bottom portion of a slot on manufacturing or integrating the electric motor. Plural magnetic pole segments, each having a back yoke portion and a teeth portion projected from the back yoke portion, are connected so as to be bendable via a connection portion provided to the back yoke portion. After winding the coil wire, a stator iron core of the electric motor is circularly formed by bending the connection portion of the plural magnetic pole segments. In the stator iron core, the bottom portion of the slot constituted by the back yoke portion and the teeth portion is made to have a curved line after the stator iron core is circularly formed.
    Type: Application
    Filed: February 16, 2001
    Publication date: October 18, 2001
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Kouji Masumoto, Tomoaki Oikawa, Tsuneyoshi Tajima, Osamu Kazama, Masaki Kato, Toshio Arai, Takuhito Miyajima, Hiroyuki Akita