Patents by Inventor Katsuo Kawashima

Katsuo Kawashima 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 motor for driving a fan
    Publication number: 20050253471
    Abstract: A permanent magnet motor for driving a fan is rotated while a movement of the rotor in a direction of thrust of a rotary shaft with a rotation of the fan is prevented by magnetic attraction force of a permanent magnet and a stator core. A surface magnetic flux density of the permanent magnet facing the stator core is lower at an end portion than at a central portion of the permanent magnet in the direction of thrust of the rotary shaft.
    Type: Application
    Filed: June 22, 2005
    Publication date: November 17, 2005
    Inventors: Yuji Enomoto, Osamu Sekiguchi, Hitoshi Ishii, Katsuo Kawashima
  • Permanent magnet motor for driving a fan
    Patent number: 6943475
    Abstract: A permanent magnet motor for driving a fan is rotated while a movement of the rotor in a direction of thrust of a rotary shaft with a rotation of the fan is prevented by magnetic attraction force of a permanent magnet and a stator core. A surface magnetic flux density of the permanent magnet facing the stator core is lower at an end portion than at a central portion of the permanent magnet in the direction of thrust of the rotary shaft.
    Type: Grant
    Filed: February 12, 2004
    Date of Patent: September 13, 2005
    Assignee: Japan Servo Co., Ltd.
    Inventors: Yuji Enomoto, Osamu Sekiguchi, Hitoshi Ishii, Katsuo Kawashima
  • Motor
    Patent number: 6927526
    Abstract: A rotor of a motor is attached to a rotor axis slidably both in axial direction and rotational direction, each of elastic bodies is attached to each of side faces of the rotor, and the rotor is fastened to the rotor axis through the elastic body, mechanically by applying pressure on each of the side faces of the rotor in the axial direction through the elastic body, or chemically by bonding the rotor axis and each of the elastic bodies as well as each of the elastic bodies and each of the corresponding side faces of the rotor.
    Type: Grant
    Filed: May 7, 2003
    Date of Patent: August 9, 2005
    Assignee: Japan Servo Co., Ltd.
    Inventors: Hitoshi Ishii, Katsuo Kawashima, Hideo Takahashi, Toshio Kobayashi, Toshimi Abukawa
  • Permanent magnet motor for driving a fan
    Publication number: 20040160139
    Abstract: A permanent magnet motor for driving a fan is rotated while a movement of the rotor in a direction of thrust of a rotary shaft with a rotation of the fan is prevented by magnetic attraction force of a permanent magnet and a stator core. A surface magnetic flux density of the permanent magnet facing the stator core is lower at an end portion than at a central portion of the permanent magnet in the direction of thrust of the rotary shaft.
    Type: Application
    Filed: February 12, 2004
    Publication date: August 19, 2004
    Inventors: Yuji Enomoto, Osamu Sekiguchi, Hitoshi Ishii, Katsuo Kawashima
  • Motor
    Publication number: 20040017127
    Abstract: A rotor of a motor is attached to a rotor axis slidably both in axial direction and rotational direction, each of elastic bodies is attached to each of side faces of the rotor, and the rotor is fastened to the rotor axis through the elastic body, mechanically by applying pressure on each of the side faces of the rotor in the axial direction through the elastic body, or chemically by bonding the rotor axis and each of the elastic bodies as well as each of the elastic bodies and each of the corresponding side faces of the rotor.
    Type: Application
    Filed: May 7, 2003
    Publication date: January 29, 2004
    Inventors: Hitoshi Ishii, Katsuo Kawashima, Hideo Takahashi, Toshio Kobayashi, Toshimi Abukawa