If I could just chime in, I honestly think the best MOT design, as far as
something for students, is a simple twin MOT (center tap grounded). I get 5
foot arcs from mine, and it requires very little work or know-how, zero
expense, and has proven incredibly durable (and I've burned up literally
dozens of MOTs doing things wrong, so when I say durable, I mean bullet AND
fool proof). Just use no ballast, and size your cap to match your
breakrate so that you get 70-ish percent charge per bang (async spark gap).
On Thu, Dec 22, 2016 at 2:48 PM, Martin Slinning <martinslinning@xxxxxxxxx>
wrote:
> Hi tedl in New Zeeland!
>
> Exellent! Fantastic!! This is the kind of setup we are looking for. Do you
> still have access to it? Or, do you have pictures? How did you solve the
> part with just the outer two in transformer oil? This is really
> interesting. I think this is the biggest setup i have heard of so far!
> I think we can manage from your decription, but some pictures would really
> help..
>
> Best regards
> Martin
>
> 2016-12-22 9:13 GMT+01:00 TESLA <tesla@xxxxxxxxxxxxxxx>:
>
> > Hi Martin
> >
> > I built a really high power tesla from MOT s (14 in the whole machine)
> >
> > * That was 6 MOT's in primary centre ground 3 per side (shunts removed)
> > input load shared by separate power to each half of the 6 MOT's
> > * Considerable PFC was used and NO other ballasting was needed (drew 50a
> > or so from my 230v supply at full bore)
> > * Outer MOT's in xfrmr oil (no mains eths used, some like to apply that
> I
> > recommend swamping capacitance between core and secondary and core and
> > primary to equalise stress if floating core
> > * FW bridge of 3A 1kV diodes (just lots and lots used overkill and no
> > equalising components)
> > * DC Pi filter of 2uF caps and 10mH MOT arrage (gapped MOT's of 0.3mm
> > array of 4 , 2 in series then parallel two of those)
> > * Ring up inductor another array of 4 gapped MOT's (parallel two sets
> of
> > 2 in series)
> > * DQ of about 50 1n4007
> > * Bleeders on ALL Caps (several independent chains in case one chain
> went
> > open)
> > * 90nF Cp (Used CDC 942C series 942C16P33K, for big coils these are
> > better value than the so called Geek group ones
> > * 300bps rotary SG (was sync but need not have been)
> > * Big secondary and large topload (8" and also a 12" at times and 300mm
> > x1.1m top)
> >
> > That beast did well over 10kVA and over 3.5m arcs, it is perhaps a little
> > ambitious but makes good use of very cheap components,unsafe in the hands
> > of untrained users, I recently gave it to an enthusiast with better
> > location to use it. Needs a dedicated supply (spa pol in my case, all
> > stoves and water heaters switched off when it was running to keep pole
> fuse
> > intact.)
> >
> > Good luck tedl in NZ
> >
> > -----Original Message----- From: Martin Slinning
> > Sent: Thursday, December 22, 2016 5:15 AM
> > To: tesla@xxxxxxxxxx
> > Subject: [TCML] Tesla coil setup using MOT
> >
> > Hi.
> > My students and i have just finished building av flyback/zvs coil and
> want
> > to step up to a New coil using MOTs. We have seen different setups but we
> > are looking for tips on how to build the most effective coil. In Norway
> we
> > have limited access to NST, but MOTs are no problem. We have now about 11
> > mots and a bunch of MO caps and diodes.
> > We are planning on making av rsg using av 2800 rpm motor and an inverter
> > to raise to 150-200 Hz to get whatever rpm we need.
> > Anyone who can give us tips on what to do, and not do, are greatly
> > appreciated.
> >
> > Best regards
> > Martin Slinning.
> > (Teacher Electric automation at Norwegian highschool.)
> >
> >
> > Sendt fra min iPhone
> > _______________________________________________
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> >
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