Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1998-03-24
2000-01-11
Gaffin, Jeffrey
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
361 51, H01H 4700
Patent
active
06014307&
ABSTRACT:
A fire door opener and method of electronically controlling the door descent speed is described. The operator includes a DC brake solenoid coupled to an AC motor drive system with an inline gear reducer and an electronically controlled descent device with battery backup power. If the brake is disengaged, the door will drop by overcoming the internal inertia and friction in the inline gear reducer. Speed of descent is controlled electronically by measuring the descent speed of the fire door at its limit shaft and electrically modulating the brake engagement using the DC solenoid.
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Gaffin Jeffrey
Huynh Kim
The Chamberlain Group, Inc.
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