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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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