Patents by Inventor Makio Sei

Makio Sei 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).

  • Squirrel-cage rotor having end rings of double structure
    Patent number: 4309635
    Abstract: A squirrel-cage rotor for an induction motor is disclosed. In this rotor, each of end rings electrically connecting the associated ends of the conductor bars received in the slots of the rotor core comprises a first ring portion disposed in contact with the associated end face of the rotor core, and a second ring portion disposed on or coupled to the first ring portion through a member of a magnetic material in the axial direction of the motor, this second ring portion having a sectional area smaller than that of the first ring portion when the section is taken in a direction orthogonal with respect to the axis of the motor.
    Type: Grant
    Filed: February 1, 1980
    Date of Patent: January 5, 1982
    Assignee: Hitachi, Ltd.
    Inventors: Makio Sei, Kunio Miyashita