Patent ID: 6079549
Filing Date: 2000-06-27
Classification: B65G,G05D

Abstract:
A drive unit for an electromagnetically excited vibratory conveyor having an armature and a yoke, said drive unit comprising an oscillator circuit including a drive coil disposed on said yoke, said drive coil having an inductance fluctuating responsive to mechanical vibrations of said armature, said oscillator circuit oscillating with an oscillator frequency fluctuating in synchronism with fluctuations of said inductance; and a processing unit for processing said oscillator frequency to define at least temporal instants of drive pulse supply to said drive coil and periodically supplying drive pulses to said drive coil, whereby mechanical vibrations of said conveyor are detected directly by said drive coil in said oscillator circuit with the inductance of said drive coil fluctuating in response to said mechanical vibrations.