Apparatus and system for controlling the operating frequency of

Details Apparatus and system for controlling the operating frequency of Apparatus and system for controlling the operating frequency of

1998-07-30

2000-09-12

Hess, Douglas

Conveyors: power-driven

Conveyor section

Reciprocating conveying surface

198762, 318114, B65G 2724

Patent

active

061164089

ABSTRACT:
An apparatus and system are provided for controlling the operating frequency of an electromagnetic vibratory feeder at a submultiple of the power line frequency. The apparatus is couplable to a terminal of an electromagnetic coil of the electromagnetic vibratory feeder, to control the current through the electromagnetic coil and thereby control power delivered to the electromagnetic vibratory feeder. The apparatus includes a quadrac coupled to the alternating current source; a capacitor coupled to the AC current power source and coupled through a first diode to a gate electrode of the quadrac; and a resistive network coupled through a second diode to the capacitor and to the first diode. The capacitance value of the capacitor and the resistive value of the resistive network form an RC time constant, which is predetermined to provide a selected operating frequency for triggering the quadrac and thereby providing power to the electromagnetic vibratory feeder at a submultiple of the power line frequency.

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