Re: 3 phase car alternators

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "S&JY" <youngsters@xxxxxxxxxxxxxxx>

I tried your idea below many years ago.  I modulated the field winding and
left the rest of the alternator as-is.  The idea was to modulate the field
winding at 60 Hz to cause the D.C. output to be modulated also at 60 Hz.
Sort of like a magnetic amplifier.  Unfortunately, at least for the
alternator I tried it with, the "frequency response" rolled off drastically
at only about 10 Hz, and at 60 Hz there was no useful AC output.  Very
disappointing.  But maybe you have a different style alternator that can
function well with a 60 HZ field excitation.  Please let us know how it
works for you.

--Steve Y.

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, October 18, 2006 6:38 PM
Subject: Re: 3 phase car alternators


> 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
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