Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1975-07-21
1977-02-15
Moose, Harry
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361156, H01H 4700
Patent
active
040084205
ABSTRACT:
An arrangement for the production of a magnetic rotary field with the help of a crossed coil pair of separate capacitance connected across each of said coils to form respective parallel resonant circuits each of which is in series with a timing circuit, a controllable voltage source and a resonant circuit switch. A timing pulse succession is fed into a program generator which supplies two 90.degree. phase shifted groups of pulses respectively consisting of starting pulses, stopping pulses, and operational pulse successions. A first switching stage is controlled in each group by the starting and stopping pulses. The first switching stage is connected ahead of the resonant circuit in series with a controllable voltage source. The operational pulse succession controls a second switching stage which is parallel to the first switching stage and which is positioned in series with a controllable similarly poled voltage source whereby a direct voltage of opposite polarity is superimposed over the starting, stopping and operational pulses.
REFERENCES:
patent: 3163804 (1964-12-01), Cox
patent: 3682144 (1972-08-01), Suda
Moose Harry
Siemens Aktiengesellschaft
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