Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Including means for using – or compensating for – the induced...
Patent
1996-10-09
1998-05-05
Leja, Ronald W.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Including means for using, or compensating for, the induced...
H01H 4700
Patent
active
057484325
ABSTRACT:
An automatic transfer switch for transferring a load between a normal power source and an alternate power source has a control circuit which senses the movement of the plunger of the switch-actuating solenoid into a position proximate the plunger stop or pole piece and then turns off power to the coil current so that the plunger can be restored to its rest position as the inertia of the switch enables completion of the transfer. Upon interruption of voltage to the coil, the coil is switched in series with a resistance which rapidly dissipates the residual current generated by the collapsing field within the coil to alleviate the braking effect of the residual coil current on the solenoid plunger.
REFERENCES:
patent: 4458290 (1984-07-01), Miyashita
patent: 4949215 (1990-08-01), Studtmann et al.
Przywozny Walter
Scheffer Daniel
Automatic Switch Company
Leja Ronald W.
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