Re: Re: Convert your MOT to NST?

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

Original poster: "Cory Roussel by way of Terry Fritz <twftesla-at-qwest-dot-net>" <imcuddlycory-at-yahoo-dot-com>

Hello,


About your ideas- whoa- hold on, how would an oil bath
work on a MOT??  The secondary turns seem way too
tightly wrapped to fit any oil in... The insulation
seems to make a fluid proof seal.


Cory Roussel



--- Tesla list <tesla-at-pupman-dot-com> wrote:
> 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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