Hello,
the fundamental operating principle of Joseph Newman's machine is this, take two inductors, both with the same resistance but one with much higher inductance, supply them both with the same amount of power and, when you switch them off the counter electromotive force (CEMF, back-EMF, whatever you like to call it) will be larger in the inductor with the highest inductance.
The formula for the stored energy in an inductor is :
W=1/2 L I^2 (stored energy = 0.5 x inductance (L) x Current (I) to the power of 2, or squared.
This is an interesting formula in that it says that, for the same input current, a coil with higher inductance will return more energy.
This is easy to investigate, i made 2 coils of equal resistance but one with much larger inductance, hooked them up in turn to a DC PSU supplying 10 volts and put a switch in the circuit for turning the power on and off and a Neon bulb in the circuit for power comparison and indeed, the coil with the larger inductance delivers more power to the Neon bulb, making it flash much more brightly.
The obvious question is, is there an upper limit to this returned energy? If it's larger in coil number 2 than in coil number one, then what about coil number 3 etc ... ?
So my second test compared much larger inductors :
Coil 1 :
R=102 O
L=0.5 H
Weight=4KG
Coil 2 :
R=102 O
L=4.6 H
Weight=18.5KG
I was lucky enough to get coil #2 on ebay for £91, it's worth £200 to a scrap dealer and £350 if bought from my usual supplier (
https://www.wires.co.uk).
The results were the same, coil 2 delivered much more power to the Neon than coil 1, and both were brighter than the first pair of coils even with the increased resistance.
I spent many hours trying to translate Newman's commutator to solid-state switching but you simply don't get the large spikes that you do with mechanical switching, you get spikes but they are orders of magnitude smaller, so my next step is to make a commutator for high-speed switching.
I've made a YT channel and am uploading a video of the first coil-pair test just now, in the meantime i've attached a pic showing both coil pairs.