Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1989-11-06
1991-10-08
Pellinen, A. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
323270, 323349, H01H 4700
Patent
active
050559613
ABSTRACT:
An apparatus for dampening current in a coil has a switchable member which controls the current level in the coil and a flyback circuit that allows current in the coil to slowly dissipate when the switchable member changes from an "ON" to an "OFF" state. The flyback circuit has a high resistance when the switchable member changes from the "ON" to the "OFF" state so that the coil current is dampened as quickly as possible without creating a destructive voltage and low resistance when the switchable member is in the "ON" state to conserve energy. A signaling device creates a voltage signal as a function of current passing through the flyback circuit and a receiving device varies the resistance of the flyback circuit in response to the voltage signal. The apparatus is particularly suited for use in a motor control circuit.
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Wiblin Wayne T.
Wild Arthur
Caterpillar Industrial Inc.
Gaffin Jeffrey A.
Hickman Alan J.
Janda Steven R.
Pellinen A. D.
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