Patents by Inventor Akihisa Hamaguchi

Akihisa Hamaguchi 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).

  • Method of magnetizing rotor of motor
    Patent number: 4748535
    Abstract: A method of magnetizing a rotor of a motor including the rotor made of an integrated magnet member and a stator is provided. Predetermined magnetic fields are preliminarily applied to the rotor to form magnetic paths and thereafter, the rotor is demagnetized. Then, the rotor is assembled into the stator. The rotor and stator are positioned such that the directions of the magnetic fields which are generated from the stator winding of the stator coincide with the directions of the magnetic paths of the rotor. Subsequently, in the state in which both of the rotor and stator are positioned, a current is supplied to the stator winding and the magnetic fields are generated, thereby magnetizing the rotor by the magnetic fields.
    Type: Grant
    Filed: January 30, 1987
    Date of Patent: May 31, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Noriaki Arawaka, Kenichi Iizuka, Hideo Uzuhashi, Masahiko Sugiyama, Akihisa Hamaguchi, Takashi Seshita