Patents by Inventor Tsuneyoshi Tajima

Tsuneyoshi Tajima 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
  • Permanent magnet type motor and method of producing permanent magnet type motor
    Patent number: 6717315
    Abstract: To provide a permanent-magnet motor having a permanent magnet which can reduce the vibration and the noise without lowering the efficiency of the motor, the permanent-magnet motor according to, the present invention has a stator 1 having stator winding of plural phases, a rotor 10 having a stator core 12 facing to inside of the stator across a gap part and a permanent magnet 14 provided to the rotor core. In the permanent-magnet motor, the permanent magnet 14 is made to have both a convex part to the inner diameter side and a convex part to the outer diameter side in the cross section taken vertically to the rotation axis, and a focus of magnetic orientation of each magnetic pole of the permanent magnet is located outside of the rotor 10.
    Type: Grant
    Filed: July 24, 2001
    Date of Patent: April 6, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tsuneyoshi Tajima, Tomoaki Oikawa, Osamu Kazama, Koji Masumoto, Masaki Katou, Kazuhiko Baba
  • 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