Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1979-09-10
1982-04-20
Miller, J. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
336136, 361160, 303 20, 188158, F16D 6706
Patent
active
043262368
ABSTRACT:
A control system for providing controllable direct current power for energizing an electromagnetic brake having an alternating current power supply and a power rectifier for converting and supplying direct current power to the brake. A power switch controls the amount of direct current power supplied to the brake. A control circuit controls the actuation of the power switch and includes a brake control actuating a variable output transformer. The output from the transformer is converted to a variable pulse width signal for actuating the power switch. Preferably, the transformer is a variable ratio transformer having a movable core connected to the operator's control. A battery charger and batteries may be connected to the ouput of the power rectifier for maintaining brake power in the event of alternating current line failure. Multiple transistor power switches connected to separate brake coils maintain a portion of brake power in the event of partial equipment failure. An oscillator provides a sine wave voltage to the transformer primary and the actuation of the operator's control provides a substantially linear output from the transformer secondary. Protective circuits such as an RC filter may be connected across the power rectifier to limit overshoot upon actuation and a rectifier is connected across the brake for current flow during the time the power switch is off.
REFERENCES:
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patent: 3994348 (1976-11-01), Schowalter
Huelsman Conrad J.
Lipke Donald L.
McNair Willie L.
Van Wambeck Stanley H.
Baylor Company
Miller J. D.
Schroeder L. C.
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