Patents by Inventor Minao Isayama

Minao Isayama 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 producing laminated iron cores
    Patent number: 6718616
    Abstract: A method of producing a laminated iron core by punching and laminating rotor and stator core pieces. The rotor core pieces are punched from a metal sheet and laminated. Magnetic pole teeth are roughly punched in the metal sheet with the rotor core pieces removed. Each of a plurality of magnetic pole teeth are pressed at plural different portions to form thin parts so as to develop the plurality of magnetic pole teeth toward the punched side of the rotor core piece. Thereafter, the stator core piece is punched to form front tips on the magnetic pole teeth defining an internal form on the stator core piece. An external form of the stator core piece is punched. The punched stator core pieces are laminated in succession.
    Type: Grant
    Filed: January 16, 2002
    Date of Patent: April 13, 2004
    Assignee: Mitsui High-Tec, Inc.
    Inventors: Atsushi Fukui, Minao Isayama
  • Method of producing laminated iron cores
    Publication number: 20020114824
    Abstract: In a method of producing an iron core by punching and laminating stator core pieces and rotor core pieces from the same metal sheet, it is an object of the invention that magnetic pole teeth of the roughly punched stator core pieces are caused to stably develop by pressing toward space sides made by previously punching the rotor core pieces so as to sufficiently secure punching margins for pressing out the front tips of the magnetic pole teeth of the internal forms of the stator core pieces and the punching can be performed without obstacles even if a gap with the rotor core pieces is small, and further ruggedness formed on a surface of the metal sheet by pressing does not cause disturbances in a flow of magnetic flux.
    Type: Application
    Filed: January 16, 2002
    Publication date: August 22, 2002
    Inventors: Atsushi Fukui, Minao Isayama
  • Method for producing laminated iron cores
    Patent number: 5539974
    Abstract: A method for producing laminated iron cores, in which at least one of a semi-stator sheet piece and a semi-rotor sheet piece is subjected to a pressing operation in a sheet thickness direction to be extended inwardly radially and outwardly radially and to make large a blanking width, so that, when the semi-stator sheet piece is subjected at its inner peripheral edge portion to a blanking operation and the semi-rotor sheet piece is subjected at its outer peripheral edge portion to a blanking operation, generation of `scum riser` phenomenon or the like can be prevented in advance.
    Type: Grant
    Filed: June 16, 1994
    Date of Patent: July 30, 1996
    Assignee: Mitsui High-Tec, Inc.
    Inventor: Minao Isayama