Subharmonic controller for electromagnetic exciter

Details Subharmonic controller for electromagnetic exciter Subharmonic controller for electromagnetic exciter

H - Electricity

02

K

318/4

H02K 33/12 (2006.01) H03K 17/13 (2006.01) H03K 17/735 (2006.01)

Patent

CA 1219900

-17- ABSTRACT OF THE DISCLOSURE A subharmonic controller for a dual coil electro- magnetic vibrator, which derives both power and timing. from a conventional a.o. line, having a zero crossing detector providing pulses at twice line frequency to a phase control. The phase control provides a selectively variable pulse width and triggers a frequency divider, which in turn triggers a divide-by-two counter. Pulses from each of the phase control, divider and counter are fed to a logic controller which generates plus and minus gate signals. The gate signals alternately fire a pair of oppositely-directed SCR's, each SCR connected in series with one of the dual coils across the a.c. line. A information and synchronize it with the direction of conduction of the SCR's.

453424

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