Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1990-02-20
1991-12-24
Scott, J. R.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
335284, 29596, H01F 720
Patent
active
050758144
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 . The external apparatus includes a yoke magnetizing device adjacent the external circumference of the yoke, a power source voltage applying device for supplying a voltage from a capacitor power source to the yoke magnetizing device, and a step rotating device controlled by the power source applying device for incrementally rotating the rotor at least one or more times in its normal rotating direction after each application of voltage from the capacitor power source.
REFERENCES:
patent: 4039853 (1977-08-01), Koizumi et al.
patent: 4648004 (1987-03-01), Richter et al.
patent: 4748535 (1988-05-01), Arawaka et al.
Kimura Saburo
Kubota Toshiharu
Tsuzaki Atsushi
Yokoyama Yoshiyuki
Mitsuba Electric Manufacturing Company Ltd.
Osborn David
Scott J. R.
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