Re: MOT Power Supply Questions

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

Original poster: "Simonas by way of Terry Fritz <teslalist-at-qwest-dot-net>" <rasim-at-takas.lt>


maybe I've not explained it clearly:
Two MOT's are in series on each phase, giving ~4kV AC per phase. After
rectifier, summing all three outputs and placing smoothing capacitor there
should be 4kV times sqrt(2) times sqrt (3) output.. which is about 10kV DC
...
Problem I encountered is when connecting MOTs in series one have carefully
phase both primaries and secondaries, in order to get double voltage and not
MOTs canceling each other out.. That I did, So now I have three pairs of
MOTs providing each ~4kV AC.
Question is, how to check relative phasing of them all before connecting
whole thing to 3 ph. ?? As I'm using unprotected connection to power company
(no brakers, no watt meter) I don't want to mess around with 3 phase and
incorectly connected 6 MOTs..  :):)
I measured current having them connected all to one phase, with pairs of
course not in star configuration, just left opened,  and it already draws
some 15A with voltage being 220V..

if anyone would help me find solution that would be great ;) My 10kVa (I
hope to squeeze 10kVA out of those 6 MOTs ;):))  model is just about to be
finished, lacking only rotary and charging reactor not completely wound..
BTW what spark lenght I could expect?
thanx for answers.. ;)

Simonas


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, April 02, 2003 4:26 AM
Subject: Re: MOT Power Supply Questions


 > Original poster: "David Speck by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<dave-at-davidspeckmd-dot-org>
 >
 > Simonas,
 > As I understand three phase circuits, the best you would get from this
 > arrangement is about 4400 volts, or about the voltage of two MOTs in
 > series.  You would get 3X the current capability of one MOT pair, and less
 > ripple on the DC because of the three phase advantage.
 >
 > To get 6 x 2200 volts out, you would have to have all 6 transformers lined
 > up in series so that the peak voltage would be reached in each transformer
 > simultaneously.  That will never happen in your three phase star
arrangement.
 >
 > HTH,
 > Dave
 >
 > >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
 >
 >
 >
 >
 >
 >