RE: MOT Power Supply Questions

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

Original poster: "Mccauley, Daniel H by way of Terry Fritz <teslalist-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>

I believe i did see something similar to this on some website when I was
searching for MOT information . . .

The Captain

Hiall,

has anybody ever tried following configuration for DC tesla coil? :
3ph outlet, 6 MOTs, 6 HV diodes
2 MOTs connected in series and those 3 pairs in star configuration..
in theory there should be 10kva 10kV power suply..

I've just built one, but have trouble correctly phasing secondaries of each
MOT..

Simonas



  > Original poster: "Peter Terren by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <pterren-at-iinet-dot-net.au>
  >
  > Captain,
  > I've used 4 MOTs for 5 KW under oil for some time and get 6 foot arcs
with
a
  > six inch coil. See http://members.iinet-dot-net.au/~pterren/  Also comments
  > below.
  > Cheers Peter
  >
  >
  >
  >  > Original poster: "Mccauley, Daniel H by way of Terry Fritz
  > <teslalist-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
  >  >
  >  >
  >  > I'd like to build a MOT power supply and had a few questions.
  >  >
  >  > 1.  I am going to use 4 identical MOTs wired in series.  Does anyone
have
  >  > the proper hook-up diagrams for doing this "the best way."  I assume
we
  > want
  >  > to wire the middle two MOTs referenced at ground and then have only
one
  >  > transformer at either side floating at 2400VAC.  Also, I seen some
  > diagrams
  >  > where it appears they use two MOTs (opposed) to provide isolation for
the
  >  > 120VAC input.  Any reason why they are doing this?  It doesn't appear
to
  > be
  >  > implementing any type of ballasting.
  >
  > That's how I do it. I don't use isolating MOT's.
  >
  >  > 2.  Regarding current ballasting, what is the current trend.  Do we
remove
  >  > all shunts from the MOT or can the MOT with the shunts still installed
  > give
  >  > us the current we need. (oil submersed)  Also, anyone have luck in
running
  >  > these things to the max (under oil) without any ballasting at all???
I
  >  > think someone before stated that these things will self-limit the
current
  > at
  >  > a point where operation (without total destruction) is possible.
  >
  > I don't ballast but you could use 2 paralleled MOT's with outputs shorted
in
  > series with the 4. I run over 20A at 240V (I'm in Australia) when on full
  > with a big tank capacitor.
  >
  >  > 3.  These MOTs will be submersed in mineral oil.  What type of
enclosures
  >  > (readily available) have you guys had luck with?  Anything off the
shelf
  >  > that works extremely well???
  >
  > I use transformer oil and a plastic rectangular storage box but with a
ledge
  > inside the lip so I can drop a sheet of acrylic in which prevents splash
  > when transporting. Probably weighs about 40lbs all up and is easy to
lift.
  >
  >  > I'm hoping to get at least 5-6kW from this thing.  (Fingers crossed!)
  >
  > Easy.
  >
  >  > MOTs are a new thing for me, so any help is appreciated!
  >  >
  >  > Thanks
  >  >
  >  > The Captain
  >  >
  >  >
  >  >
  >  >
  >
  >