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I'm no expert, but I believe you are correct on all counts, though there may have been different ways of doing it. The old style mechanical regulator initially gets it's power from the residual voltage created by the residual magnetic field in the DC exciter.mylesdw said:So am I right in thinking that on that style of Century alternator with the built-in DC exciter that voltage to the AC field windings is actually regulated by adjusting the voltage to the DC field windings and the DC generator output drives the AC field directly? If I understand correctly, a solid state regulator can replace the DC exciter and its 'mechanical' regulator completely and would drive the AC field directly. Where does the regulator get its power from? Is this the residual magnetism and 'flashing the field' thing?
Paul, That engine is not a diesel but a Hesselman oil engine built under license by Waukesha.Paul F. Thompson said:Jim, the tag on the exciter says 4. amps. I fired the unit up tonight and took readings at both sides of the resistors ( 2 fixed and the reostat ). From the F1 terminal to neuteral was -5 volts, A2 to neuteral was 54 volts, and F1 to A2 was 60 volts. The resistors are all in series between F1 and A2. The only load I had on it was a 15 hp 3 phase motor running free. In case anyone is interested, the engine is a Waukesha 130HL spark ignited diesel built in march of 1943. Hope these numbers help you understand this thing. THANKS again and special THANKS to Harry for this board. Paul