Re: 3 phase car alternators

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Tim S <stm800@xxxxxxxxxxx>

i might just do this experiment as i have an acdelco 108 amp(pre 1980 i think)
 with internal diodes allready removed and i also removed the 
internal module that regulates the field winding.
so i have a bare bones setup.

once i thought since the field winding is a north south static 
polarity why not use a mosfet bridge and modulate the field winding 
with a frequency say 60 hz and see the result of the 3 phase 
windings.i am sure due to the iron claw core that is inside covering 
the field winding there will be some frequency that the field coil 
will saturate at but i really don't know the answer.that is why i was 
experimenting in the first place.

i started this idea 8 months ago and due to other things always 
popping up i never got to finish this idea.
  tim


Tesla list <tesla@xxxxxxxxxx> wrote:
Original poster: Jeff Larson

About 15 years ago when I started playing with Tesla coils my friend
and I were looking for sources of high voltage since we had burned
out the transformers that we had. We had taken apart a alternator
and removed the diodes and extended the stator windings out of the
case. I think we just fed them through holes in the side. This was
C clamped to the welding table. We then put a 18 inch pulley on a 8
Hp Briggs and Stratton gas engine that had a horizontal shaft. The
engine was also mounted to the welding table so that a belt was
placed on the large pulley and the tiny pulley of the
alternator. The speed ratio between the engine and the alternator
was huge. Like maybe 1 to 9. Any way,
the engine was started and run up to speed. The alternator was
singing at a high speed. Then 12 volts was applied to the field
winding, or was it 24, I don't remember. What I do vividly
remember was the hot arcs that jump between the stator wires sticking
out in the air. It was like a Jacobs ladder. Man did that put a
load on the engine. It would bog the engine way down until we
removed the voltage on the field winding.
I don't know how much voltage was on stator, but the wires must have
been about 1/4 to 1/2 inch apart. So maybe 10kv. Imagine that! We
didn't use it for anything, but it was fun.
I think someone out there needs to revisit this experiment. Who has
the stuff , and the time? A challenge. We will want to see video.
Jeff Larson