Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1985-12-12
1987-08-18
Gellner, Michael L.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
123490, 361159, 361167, 361194, 361210, H01H 4732
Patent
active
046881387
ABSTRACT:
A method and apparatus for driving an electromagnetic device includes two coils which selectively attract and repel a moving body. In order to allow a quick switching of the moving body between being attracted by one coil and the other, the current through the coil which is not holding the moving body in its magnetic field can be made to be a level higher than the current to the coil which is holding the body in its magnetic field. By reducing the current to the coil that is holding the body, the body can be rapidly switched to be within the magnetic field of the other coil. In addition, the currents to the respective coils can be increased before this switching occurs. Structure can also be provided across the coils to quicken the time it takes for the magnetic field to dissipate.
REFERENCES:
patent: 3700985 (1972-10-01), Applequist
patent: 4326133 (1982-04-01), Tasma
patent: 4395743 (1983-07-01), Sunaga et al.
patent: 4503480 (1985-03-01), Pickard et al.
Kajima Takashi
Nagata Osamu
Ozaki Toshiharu
Gellner Michael L.
Technological Research Association of Highly Reliable Marine Pro
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