Variable frequency controller

Details Variable frequency controller Variable frequency controller

G - Physics

05

D

318/3, 342/43.1

G05D 19/02 (2006.01) H02K 33/00 (2006.01) H02M 5/27 (2006.01)

Patent

CA 1229656

ABSTRACT OF THE DISCLOSURE A frequency divider and phase control for an electromagnet used in a vibratory material handling equipment has a coil operable from a single phase alternating current source. A zero crossing network is connected to the source and produces a first pulse each time the source crosses zero. A synchronous presettable counter capable of counting to a limit is connected to receive the first pulse and produce a carry signal when the limit is reached. A monostable multivibrator is connected to receive the signal and generate a second pulse. A triac is connected in series with the coil across the source and gated by the second pulse. The counter is preset to vary the frequency of the pulses to the triac.

453410

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