Dave Bowling's 3 Battery Generator includes Newman's Unknown Extra Energy Source - Vinyasi/circuitjs1-falstad-vinyasi GitHub Wiki
Ever since I managed to understand Newman's eighth edition enough to simulate it, I've been of the opinion that - although it's overunity - it's not entirely a mystery where the extra energy comes from.
It comes from the spinning magnetic field surrounding the rotating bar magnet/s in the center of the coil. They produce lots of amps, but not much volts. These sinewaves then blend with the square waves arriving from the battery pack, and then chopped up by the commutator, creating a blended waveform.
The massive coil is doing more than merely filter out current flowing from the batteries. It also draws current through the rotating magnetic field surrounding the spinning permanent magnets. As to where this excessive current comes from, I don't know...
But I do know that most of it goes to waste due to the poor coupling coefficient between the spinning magnetic field and the massive coil which surrounds it.
Well....
What helped me understand Dave Bowling's Three Battery Generator was the key advice from him and others replicating his work, to: "hand turn the axle of the D/C brush motor after five minutes of waiting for it to self-start if it should fail to". This is exactly like the Newman motor. Thus, I began to attempt a set of simulations. Here is one of them ...
It's possible to simulate increased current drawn from a source (the sparking brushes in these examples) whenever the load increases (represented by adding more batteries that need charging) along with decreased current at the initial source (the rotating magnetic field of the magneto rotor represented by the A/C voltage source in these simulations) ....
The most interesting part is that it matters what the wiring position of the brushes are in relation to the commutator. If they're on the side of the commutator facing the rotor coils, then OverUnity will result. But if the brushes are sparking on the side of the commutator opposite the rotor coils facing the circuit surrounding the D/C motor / alternator, then smooth half sinewaves (similar to a crystal radio audio output) will result and no OverUnity...
More information about these simulations.
Short animation ...