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Re: [TCML] MOTS

To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Subject: Re: [TCML] MOTS
From: "DC Cox" <resonance@xxxxxxxxxxxx>
Date: Thu, 23 Oct 2008 23:35:26 -0700
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I use 2 small laminated core reactors to run each MOT at 16 Amps on the pri
of each.  This gives 32 Amps total if you use separate 120 VAC circuits.
This way, you can run your
coil almost anywhere because 220 V is not required.  This provides 3.8 kVA
and solid 5.5 ft long sec sparks.

Use the largest possible sec coil dia you can to provide optimum output as
the inductance of sec coil goes up as square of the radius.
A 10" dia coilform or 12" dia coilform will provide much more output than a
6" coilform.

Select cap value to work with a 10-15 turn primary for good surge impedance
match.

Make liberal use of JAVATC --- excellent and very accurate program ---
available online.

Something to think about as you design.

Dr. Resonance




On Thu, Oct 23, 2008 at 5:57 PM, <jhowson4@xxxxxxxxxxx> wrote:

> When i get back home this thanksgiving i am going to have to find that army
> surplus store near me.
> are there any helpful hints i should follow when designing my coil to run
> on 2 Mots?
>
> -------------- Original message --------------
> From: G Hunter <dogbrain_39560@xxxxxxxxx>
>
> > The HV bushings are just hardware store PVC plumbing fittings glued in
> place
> > with regular solvent glue. The AC power cable passed through a regular
> cable
> > clamp like the ones used on household breaker boxes. It's leakproof as
> long as
> > the can doesn't tip over. Not much danger of that due to the excessive
> weight
> > of the thing. The only issue I ever had was that I allowed the power
> cable to
> > dip down into the oil. Over time, the oil wicked up into the cable until
> it was
> > saturated. I didn't catch it until oil started seeping out of the plug! I
> > replaced the power cord and stripped the jacket back far enough so that
> it
> > didn't touch the oil. That fixed it.
> >
> > Unfortunately, this neat little PSU was sitting on my garage floor when
> Katrina
> > came along. It was immersed in 2 feet of muddy, salty water. I threw it
> away
> > in disgust, along with most of my furniture and appliances. I have some
> spare
> > ammo cans however, and a small collection of MOTs. Perhaps I'll build
> another
> > one someday.
> >
> > Greg
> >
> >
> > --- On Thu, 10/23/08, jhowson4@xxxxxxxxxxx wrote:
> >
> > > From: jhowson4@xxxxxxxxxxx
> > > Subject: Re: [TCML] MOTS
> > > To: "Tesla Coil Mailing List"
> > > Date: Thursday, October 23, 2008, 5:56 PM
> > > Those ammo cases are a really good idea.
> > > Where did you get feedthrough insulators like that and how
> > > did you seal them to the case.
> > > -------------- Original message --------------
> > > From: G Hunter
> > >
> > > > If you wish to run two MOTs for about 4200VAC, then
> > > place the secondaries in
> > > > series with both cores grounded. Take the HV output
> > > from both MOT HV output
> > > > lugs. If you want to use 120VAC input, place your
> > > primaries in parallel, but
> > > > 180 out-of-phase. If you wish to use 240vac, then
> > > place your primaries in
> > > > series. Assuming the two MOTs are reasonably well
> > > matched, they will divide the
> > > > 240vac between them so each primary only sees 120vac.
> > > Again, make sure the
> > > > primaries are oppositely phased.
> > > >
> > > > A US military .30 caliber (7.62mm NATO) steel ammo can
> > > makes a sturdy, cheap,
> > > > oil-tight container. Pawn shops, Army surplus shops,
> > > and flea markets have
> > > > zillions of them. Two MOTs will just fit in there, so
> > > you won't need too much
> > > > oil. Worked well for me anyway:
> > > >
> > > > http://hot-streamer.com/greg/MOTDOC.htm
> > > >
> > > > and
> > > >
> > > > http://hot-streamer.com/greg/Mark_III.htm
> > > >
> > > > Cheers,
> > > >
> > > > Greg
> > > >
> > > >
> > > > --- On Wed, 10/22/08, jhowson4@xxxxxxxxxxx wrote:
> > > >
> > > > > From: jhowson4@xxxxxxxxxxx
> > > > > Subject: Re: [TCML] MOTS
> > > > > To: "Tesla Coil Mailing List"
> > > > > Date: Wednesday, October 22, 2008, 5:14 PM
> > > > > ok. I just wasn't sure if there were any
> > > benifits to
> > > > > disconnecting it from the core.
> > > > > i am assuming that to run 2 together to get about
> > > 4kv i
> > > > > should connect the cores together. giving me 2 HV
> > > outs.
> > > > > should I connect the primary's in series or
> > > parallel. i
> > > > > already know about how to match the phase by
> > > reversing a
> > > > > primary input in necessary.
> > > > > Before i do that though i have to find a way to
> > > put these
> > > > > in oil. any suggections for a container that
> > > could be
> > > > > sealed up nicely. with the help of epoxy or
> > > something else.
> > > > >
> > > > > -------------- Original message --------------
> > > > > From: G Hunter
> > > > >
> > > > > > Should what be removed? Do you mean remove
> > > the HV
> > > > > winding, or remove the core
> > > > > > connection?
> > > > > >
> > > > > > Regardless, don't remove either one of
> > > them. Just
> > > > > leave the MOT alone and take
> > > > > > your HV off the single HV lug. This worked
> > > for the
> > > > > magnetron tube supply in the
> > > > > > oven, and it will work for you too. The
> > > return path is
> > > > > through chassis ground to
> > > > > > the MOT core. A picture is worth 1000 words,
> > > so see my
> > > > > MOT schematic:
> > > > > >
> > > > > > http://hot-streamer.com/greg/MOT_chat.htm
> > > > > >
> > > > > > No need to re-engineer your MOTs. They can
> > > drive your
> > > > > vacuum tube or tubes just
> > > > > > as they are.
> > > > > >
> > > > > > Greg
> > > > > >
> > > > > >
> > > > > >
> > > > > > --- On Wed, 10/22/08, jhowson4@xxxxxxxxxxx
> > > wrote:
> > > > > >
> > > > > > > From: jhowson4@xxxxxxxxxxx
> > > > > > > Subject: Re: [TCML] MOTS
> > > > > > > To: "Tesla Coil Mailing List"
> > >
> > > > > > > Date: Wednesday, October 22, 2008, 3:04
> > > PM
> > > > > > > ok. so leave everything alone. sounds
> > > good to me.
> > > > >
> > > > > > > What is the best way to connect
> > > everything
> > > > > together for TC
> > > > > > > use? I noticed that one of the HV
> > > windings is
> > > > > connected to
> > > > > > > the core. should that be removed.
> > > > > > >
> > > > > > > thanks,
> > > > > > > Jay Howson
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > _______________________________________________
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> > >
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Follow-Ups:
- [TCML] VACUUM CAPACITORS
  - From: Michael Creigh

References:
- Re: [TCML] MOTS
  - From: jhowson4

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