RE: help limiting mots

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

Original poster: "Loudner, Godfrey by way of Terry Fritz <twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>



> -----Original Message-----
> From:	Tesla list [SMTP:tesla-at-pupman-dot-com]
> Sent:	Sunday, January 20, 2002 7:04 PM
> To:	tesla-at-pupman-dot-com
> Subject:	Re: help limiting mots
> 
> Original poster: "J Whyte by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <xoom321-at-hotmail-dot-com>
> 
> 
> 
> 
> All microwave transformers (MOT's) are already current limited dispite 
> popular myth. They must be wound with #27, not #36 for the secondary.
> 
> I have over 50 mots. Some of my mots draw too much current during short
> circuit in my opinion, while others perform well under short circuit.
> There seems to be a lot of variation on current limiting among different
> mots. One thing for sure is that they don't limit current as effectively
> as NSTs. I did see a study in the archives where someone knocked out the
> shunts of some mots and took current measurements. He found little
> difference in current draw during short circuit between having shunts in
> place and having the shunts removed. Of course this study is valid only
> for the mots he used. I have not come across a study of a variety of mots
> using instrumentation. There have been solid studies of NSTs. I don't
> think that mots have come into enough fashion yet, causing someone to make
> a serious study of mots using instrumentation. Tesla coiling seems to be
> moving in a direction that requires large amounts of money. Many people
> want to get into coiling, but can't get pass the transformer barrier.
> Beautiful transformers have appeared on ebay, but people with deep pockets
> have driven the prices outside the range of a lot of coilers. I think that
> mots deserve a deeper study with the goal in mind of taming their behavior
> to the extent that they become a common standard like NSTs.           
> 
> 
> 
> But be careful how far you will draw the 
> arc----because the length of the arc is corrisponding to the power 
> draw...draw the arc to long and "!!!POW!!!" you'll flip your breaker.
> 
> This I really don't understand. The only explanation I have is that when
> the arc is short, its resistance is low. Then the transformer would see
> low resistance and the voltage output would be low. As the length of the
> arc is increased, the transformer would see less resistance and respond by
> outputing higher voltage; but the current should still be high, so the
> power consumption would be higher than with a low resistance arc. 
 
 
 
  
Have you ever tried overvolting your smaller 120VAC MOT's??? Its a great
way 
to get HUGE voltages and solid current output, but this has to be done
under 
oil. It works on most larger sized MOT's....try it and find out.
I have been able to get well past 15,000 volts at short circuit of 400mA 
with 4 (120V) MOT's running 240VAC input. It draws around 7-8 kW and puts 
out HUGE LONG flaming arcs. It truely is a cheap POLE PIG! I have never 
tried hooking it up to a TC yet, but I would speculate 12' arcs are 
possiable!
 
This is something I'm going to try out.
 
 Godfrey Loudner