Re: Convert your MOT to NST?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Gregory Hunter by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ghunter31014-at-yahoo-dot-com>

Hi Steve,

I tried a similar experiment a few months back, and
got neat output sparks up to 1/3" or so from a single
MOT. I don't know how much voltage that is, but it is
certainly more than 2KV. Just for grins, I chopped off
the primary and replaced it with about 50 turns of
14AWG to increase the turns ratio. Stimulated by the
dimmer/cap combo, the modified MOT sprouted arcs of
about 1/2" to 5/8"--for a few seconds. Then it died. I
could still hear it arcing somewhere. I'm sure it was
inside the secondary or perhaps from the secondary to
the core somewhere out of sight. Too bad. It certainly
validates your principle though. Maybe I should try
this again with the MOT in an oil bath?

Spark On,

Greg
http://hot-streamer-dot-com/greg

--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "S & J Young by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <youngs-at-konnections-dot-net>
> 
> Hi list,
> 
> MOTs are sometimes used to power TCs.  MOTs are
> typically free, don't break
> down like NSTs often do, and are good for 1 KVA or
> so.  On the downside, the
> 2 KV voltage is on the low side, requiring 2 or 4 in
> series and/or voltage
> multipliers, and the current is rather high, making
> it tough to cool and
> quench spark gaps.  And their self-current limiting
> (magnetic shunts) are
> not all that effective.
> 
> Can these limitations be overcome?  Yes, sortof.   I
> tried an experiment and
> got around 10 KV out of one at reduced current -
> probably 100 ma or so
> average.  How?  By driving the MOT from a lamp
> dimmer and 15-30 mFd cap in
> series.  Same idea as driving an ignition coil for a
> TSG, only with more
> input power.  The voltage is much higher than normal
> because of the more
> rapidly changing magnetic field, and the average
> current goes down because
> power is applied for only part of a cycle.
> 
> The insulation of the MOT I tried did not break down
> for output arcs that
> would bridge 1/4 to 3/8 inch.  It would be a good
> idea to immerse a MOT run
> this way in oil to improve its chances for long term
> survival.
> 
> Using just a straight dimmer, the operation was a
> bit flaky, as others have
> reported in trying to drive an inductive load.  I
> didn't try adding a second
> triac, but I am sure that would improve performance
> a lot.
> 
> So one can get NST-like performance out of a MOT if
> driven in this unusual
> way.  A pair of them would be good for 16-20 KV at a
> 100 ma or so, depending
> on the size of the series cap used (use motor run
> caps).
> 
> Just something to consider and tinker with if you
> are so inclined.
> 
> --Steve
> 
> 
> 
> 
> 
> 
> 


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