Gyula:

Thanks for the info.

The days when we needed transformers to be built for us are gone. We now have the knowledge to build transformers of fixed output type ourselves. But we still do not know how to build a variac.

The transformer of the step down type that I would would be very costly to purchase. Rather I would buy insulated copper or aluminium wires that can carry 100 to 150 amps and then wind down as the secondary in the second coil or wind it up as a second module secondary which is of a step down type... But that is not the problem.

Problem is lot of voltage in the first module. Iron rods also carry electricity when magnetised. So we need to make the device one without any holes. and then cover the ends with plastic caps. Then we need to cover the wires again with plastic sheets. It is only then that I can test it again to check whether the system would work without the air gaps. I think it would.

Once that is cleared, then I need to measure the voltage and then decide on the number of turns and hand wide a large wire as the step down thing and check that the output voltage is acceptable and can be given to load. Then we will give it to the load.

I would build one module as step up and another module as step down ones so both of them get the benefit of magnetic attraction and do not work as normal transformers.

A normal transformer if I want to order can be ordered over the phone but we would end up paying a lot of money. This way we know what we have done and what exactly is needed and can unwind or make additional windings..

Thanks for your support and kind thoughts..

Regards,

Ramaswami

Hi Gyula:

You see the picture of the Ammeter at the bottom. Up to 5 amps I would not know what is the amperage. I have better ones than this but they are little more costly. I can order what is needed over the phone. I know a lot of people. I'm a Patent  and Trademark Attorney and I have 1200 clients with 26 years of experience. So I can order over phone and it will come to me. Thanks for the support.

@NRS


When bulbs are switched OFF, ammeter cannot show any reading if it is connected in series with bulbs.

With your description we have to conclude that you have connected the ammeter directly to the output terminals. By doing so you have shorted the output terminals through ammeter.  An ammeter should always be connected in series with load.  When you connect the ammeter to the terminals without load, it becomes parallel to the terminals and output will be shorted through ammeter. 

So, the current 20 Amps which your ammeter is showing is short circuit current which may not be the current produced by your device.  Because when you make a short ciruit,  the entire current flowing in street pole lines ( connection from electricity board) may come to your device depending on the type and configuration of device if you are drawing input power from city power supply.

When I was studying in schools,  I used to conduct such 'short ciruit experiments' unknowingly, drawing huge current from street power supply lines to my house causing blowing of fuse, damaging house wiring, burning of sockets etc.  which is a very dangerous thing to do.  (somewhere you have mentioned that you have blown off one ammeter).

Just a guess.

Hi Fellows,

Great topic and some extremely interesting discussions and information.

One brief observation/comment: "Also" consider Figuera used a commutator yielding Staircase Step Functions to drive the induction coils. These "STEPS" likely contained very steep rise and fall times especially considering the only capacitance found in his circuits appear to be the inductor coil internal winding capacitance. Note that many OU (COP > 1) applications involve disruptive transitions [spark gaps or other fast dV/dt apparatus]. Therefore this feature might be worth keeping in mind as you pursue the Back EMF mitigation aspects.

Also, there's a very talented and excellent Lecturer named Michel van Biezen (Lectures On Line) who has a Youtube channel that is probably well worth taking the time to review and refresh your Electricity and Magnetism recollection. The following six lectures may be of great interest:

Physics - Electromagnetic Induction: Faraday's Law (4 total)

https://www.youtube.com/watch?v=ejRJM-kCyWQ&list=PLX2gX-ftPVXU_CiWsaFpXh9O3k90L7jTv
https://www.youtube.com/watch?v=i80TIzF9D88&list=PLX2gX-ftPVXU_CiWsaFpXh9O3k90L7jTv
https://www.youtube.com/watch?v=jHzpPyxK6a8&list=PLX2gX-ftPVXU_CiWsaFpXh9O3k90L7jTv
https://www.youtube.com/watch?v=atbioBvN8hE&list=PLX2gX-ftPVXU_CiWsaFpXh9O3k90L7jTv

and; Physics - Electromagnetic Induction: Faraday's Law and Lenz Law (2 total)

https://www.youtube.com/watch?v=1-aoGz5X_j0&list=PLX2gX-ftPVXU_CiWsaFpXh9O3k90L7jTv
https://www.youtube.com/watch?v=MUcQqHsQjqg&list=PLX2gX-ftPVXU_CiWsaFpXh9O3k90L7jTv

Or, subscribe as this fellow is "as good as they get" and his channel is a great engineering/physics/chemistry/etc. reference source.

I can appreciate that some in this blog have a reservation regarding the "formal" sciences but hey, every bit of help is appreciated - we're all in this together!

Have a productive week...

hi..  all

NRamaswami stated some where ( i forgot ) that he was helped by some electrical engineer,
so pre-assumed that there was no wrong measurement, maybe only miss communication.
 
however, any sketch/drawing "how to use ampmeter and voltmeter" from gyulasun or others should be good to posted, i agree with what you said gyulasun about measurement. i have ever seen from webpage someone measure amperage by connecting ampmeter to output directly.

i guess, only with sketch/drawing will reduce miss communication, as Alvaro_CS (thanks for drawing) who have posted "drawing" help us to look it as start point. those all will save much time from reading and arguing everything. and also, English is not my daily language, sorry for that.

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