[TCML] 6 MOT stack?
jeremy_runescape at hotmail.com
Tue Jun 2 07:08:16 MDT 2009
Greetings to all,
I have recently completed the construction of my first coil. It has a 3ft by 3ft primary with 17.5 turns, a 4.5'' by 23'' secondary wound with 22.5 AWG wire, and a 6.5'' by 16'' torroid. The primary and secondary is supported on a 4ft by 4ft 12mm plywood board, supported over a second lower deck by 8 threaded rods, which houses my circuitry. The whole set-up is mounted on 6 3'' diameter castor wheels so the thing is mobile.
There is no problem with this set-up, in fact it is an over-kill where it comes to most aspects such as the supporting structures and wires etc. The problem is that i am currently running the whole thing off a 15/30 NST (the best thing i could find in the pathetic island country of Singapore), which effectively supplies 225W to a coil which I believe is more than capable of handling 5kW. Thus far, I have only maxed out 20cm sparks no matter what I tried (save for increasing the safety and master gaps, cos i can't afford to kill my only precious 15/30 NST). Angling the primary to 45 degrees to increase coupling seems to offer no appreciable advantage over a flat Archimedes spiral, and the optimal primary turn has been tapped at turn 12.5
I have thus come to the conclusion that I simply need more power. Since, once again, over-head power lines are non-existent in the wonderful island country of Singapore, pole pigs are non-existent as well; and there's no way I will be able to draw enough power to supply a 200kVA pad mount transformer in my neighbourhood since my neighbourhood is probably powered by 1 of those in the first place... The next best thing would be MOTs, a.k.a. the 'mini pole pigs'. I have a dozen of them aching to be used, 6 of them appearing to be of the same model, which is a good thing. The bad thing is that I have no idea whatsoever how ballasting works. I am a Chemistry major in university, and the coil construction was already stretching the bounds of my electrical engineering experience. I do know that an unballasted MOT puts out about 3500W of power before burning out after 5 minutes, and a ballasted MOT puts out about 1kW. But I need to know how to ballast a MOT stack for about 5kW, whether capacitively or inductively. Programmes for calculating circulating currents as well as trans/cap matches would be much appreciated.
I considered a 4 MOT stack initially, but am concerned if it can handle the full 5kW for prolonged periods, and the 8400V supplied seems low for a 5kW coil. Then again, with a 6 MOT stack I am worried that the MOTs at the extremities might not be able to handle the 6300V even with the stack centrally earthed. Does anyone have any experience or advice on these matters?
Any advice would be much appreciated.Merci Beacoup,Jeremy
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