Patent ID: 6116408
Filing Date: 2000-09-12
Classification: B06B,H02P

Abstract:
An apparatus for controlling an operating frequency of an electromagnetic vibratory feeder at a submultiple of a power line frequency, the apparatus couplable to a first terminal of an electromagnetic coil of the electromagnetic vibratory feeder, a second terminal of the electromagnetic coil couplable to an alternating current power source having the power line frequency, the apparatus comprising:a quadrac couplable to the alternating current power source;a capacitor couplable to the alternating current power source, the capacitor further coupled through a first diode to a gate electrode of the quadrac, the capacitor having a capacitance value;a resistive network coupled through a second diode to the capacitor and to the first diode, the resistive network having a resistive value, the resistive value in conjunction with the capacitance value forming an RC time constant, wherein the capacitance value, the resistive value and the RC time constant are predetermined to provide a selected operating frequency for triggering the quadrac and thereby providing current through the electromagnetic coil and power to the electromagnetic vibratory feeder at a submultiple of the power line frequency.