Re: [TCML] MMC for 4 mot SRGTC

["DC Cox" <resonance@xxxxxxxxxxxx>]

8300 volts at 0.5 Amps is 4200 Watts per xmfr x 4 xmfrs = 16,800 Watts.

First, your MOTs usually can not run wide open.  Best to ballast each MOT at
around 16 Amps each.  This provides 120 x 16 Amps x 4 xmfrs = 7,680 Watts.
I have cores for cheap MOT ballasting --- contact me off-list and I can
advise on this.

7.68 kVA would only require approx 0.1 uF max but you could survive with a
.07 to .09 uF range cap for good performance.  0.4177 is too much cap for
the xmfr.  I run my Big Bruiser at 26 kVA, pole xmfr powered, and it tunes
fine with a 0.3 uF cap.  This coil is 24 inch dia with a 10 ft dia. mesh
toroid.  0.4 uF is way too much for your system.

Dr. Resonance





On Sat, Apr 5, 2008 at 8:49 AM, Kris Grillo <kristianisawesome@xxxxxxxxx>
wrote:

> I am putting together a 6" coil with 4 MOT power supply and a 120 bps sync
> rotary gap.  I would like to run the mots wide open (no ballast). I
> estimated 8400 V .5A for the transformer output. For the MMC, JavaTC is
> saying I need .4117uf for LTR! That seems huge to me. I have 60 of the 942's
> for 5 strings of 12 right now, and I planned on doubling that to get to
> .1249uf before I get it up and running, but that is still less than
> resonant. I could probably swing another 84 caps to get to 12 x 12 for a
> just about resonant cap, but 336 more caps for the .4117uf value is a little
> out of my price range right now. Is it so important to run larger than
> resonant cap with a mot driven srg coil? The mots are under oil, if that
> matters. Any suggestions?
>
>
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