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Re: [TCML] MMC for 4 mot SRGTC
Hi Kris,
Something else to keep in mind regarding the primary is the coupling.
The primary needs to start at a distance of 1.5 inches from the
secondary in order to keep the coupling optimal at the forefront of the
design. 1.5" will allow a flat primary to be positioned directly
horizontal with the bottom secondary turn and you'll have very little
need to adjust coupling later. I assume the secondary is wound with #24
or #22. Either would do well.
When I look at what distance to start the primary at, both standoff
voltage and coupling are the values I look at. Javatc has a recommended
distance for this in it's output, but the distance is based on voltage
standoff. However, if I see coupling is too high, then I increase
distance until I near the recommended k value for the coil, and in your
case, probably in the vicinity of 0.135 k.
I am curious what your sec dimensions are? Also, have you already built
the primary for this MOT supply?
Take care,
Bart
Kris Grillo 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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