Patents Assigned to Mitsuba Electric Manufacturing Company Ltd.
  • Patent number: 5075814
    Abstract: An external magnetizing method and external magnetizing apparatus for a rotary electric apparatus having internal permanent magnets, which obtains permanent magnetization of metal pieces fixed along the internal circumference of a yoke from the outside of the yoke while the rotor is situated within the yoke. The external magnetizing method includes the steps of creating the permanent magnets by applying a voltage from a capacitor power source to a yoke magnetizing device adjacent the external circumference of the motor yoke, then incrementally rotating the rotor in its normal rotating direction and thereafter reapplying the capacitor power source voltage to the yoke magnetizing means to again magnetize the metal pieces to obtain a more uniform magnetization when using a capacitor power supply .
    Type: Grant
    Filed: February 20, 1990
    Date of Patent: December 24, 1991
    Assignee: Mitsuba Electric Manufacturing Company Ltd.
    Inventors: Toshiharu Kubota, Atsushi Tsuzaki, Yoshiyuki Yokoyama, Saburo Kimura