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http://www.ultrabizz.com/trans/transformer_explain.html.pdf
In my final year at a technical school we each built an arc welder where we had to wind the coils and cut the laminations ourselves. I was unhappy with the enormous weight of the resulting transformer and thought there had to be a better way. A few years later I had the solution. If you placed the primary conductor inside the secondary, then ALL the flux from the primary would have to cut through the secondary without any assistance from the transformer core. I was quite exited and constructed a “transformer” consisting of a copper pipe bent into a circle of about 45cm diameter to form the single turn secondary. The ends of the pipe did not touch and were about 3cm apart which was enough of a gap to feed 10 turns of well greased primary through the inside of the pipe. I now had a 10:1 ratio transformer.
Next I bought some MOSFETS and built a simple oscillator circuit running at about 300khz to drive the transformer. Once it was working I put two 12 volt car headlamps in series across the output ( the two ends of the copper pipe ) and they lit up brightly. I also shorted out the secondary with a screw driver which glowed red hot in a matter of seconds. I did various tests and was happy that it functioned like any other transformer except that it required a higher frequency due to the low inductance. I built various sizes and even made the secondary from aluminum foil wrapped around the primary which was easier to construct than feeding wire into a circular pipe. Even a length of coaxiel cable worked a a 1:1 transformer ( just to prove the concept ) using the screen as the secondary.
I thought I was going to revolutionise the world of transformers and get rich, so I registered a preliminary patent and proceeded to try and sell the idea. No one was interested and the local power company even responded by having one of their clever techies write me a letter explaining how transformers DO work. I thought that perhaps I needed expert backup so I wrote to a well known university and explained what I had done. I got a reply from a professor which consisted of a 2 page letter of mostly formulas which explained why it would NOT deliver power to the secondary. Yet there it lay on my work-bench, working, despite all those formulas. I wrote back and invited him to come see it working but never heard from him again.
Well at some point I blew the expensive MOSFETS, the preliminary patent expired after 12 months and now its public domain. I post this as encouragement to inventors who may have been put off by other people's opinions. If you can make it work, then it works, regardless of what the formulas say. Duncan Gray
E-mail: 
info@telesys.ru
