RE: 3 phase car alternators

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>

Hi,

Would someone back track and make clear what the goal is here? My cousin
owns a successful alternator and starter business and has hundreds of type
from big boats to you name it.

He's willing to crack the books with me if I clearly understand what you are
trying to do. Coming in this thread a bit late , it seems all over the
board. Or maybe the recent solar flares burned what's left out in my head:-)

Jim Mora

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Thursday, October 19, 2006 5:40 PM
To: tesla@xxxxxxxxxx
Subject: Re: 3 phase car alternators

Original poster: Tim S <stm800@xxxxxxxxxxx>

when you modulated the field winding did you remove the guts from the
thing that holds the slip ring brush contacts to the field winding?

there are active electronics resistor/shunts/and a voltage regulator in
there.
  i removed the guts and wired the brushes straight out the side hole.

i think i might have some time this weekend to try it out a bit.

can someone give me some ideas on how i should plot some data?

i have mine hooked up direct drive to an old wood router.
the router will run directly from a dc voltage and the last time i
remember 12 vdc on the router gave it 20,000 rpm with no load attached.
i will dust off my hand held tach for router rpm and scope with
frequency counter for the output of the alternator.

i will at least start the idea back up for i allready have the stuff
collecting dust and taking up room..if it don't work out to the trsh it
goes..

tim



Tesla list <tesla@xxxxxxxxxx> wrote:
Original poster: "S&JY"

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"
To:
Sent: Wednesday, October 18, 2006 6:38 PM
Subject: Re: 3 phase car alternators


 > Original poster: Tim S
 >
 > 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 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
 >
 >
 >
 >
 >
 >
 >
 >