Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1984-03-05
1985-10-01
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
123 9011, 361210, H01H 4732
Patent
active
045449864
ABSTRACT:
A method of and an apparatus for activating an electromagnetic positioning means or actuator of the kind sometimes known as an electrical cam with relatively low currents, by alternately energizing, or energizing with currents of opposite polarity, two electromagnets to move an armature positioned therebetween between two terminal positions. The device is activated from an inactive or passive to an active state by energizing currents having at least initially a frequency greater than the resonant frequency of the positioning means. With increasing oscillations of the armature the frequency of the energizing current is reduced to zero as the device reaches its fully activated state, i.e. when the armature has oscillated in a step-like manner to one of its terminal positions. The device may be have utility for driving gas exchange valves of internal combustion engines.
REFERENCES:
patent: 3147406 (1964-09-01), Kotos
patent: 3870931 (1975-03-01), Myers
patent: 3882833 (1975-05-01), Longstaff et al.
patent: 4432033 (1984-02-01), Brundage
Hormann Karl
Moose Jr. Harry E.
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