It's an electrical generator. The principles it works on are very unconventional. There is nothing I know if in mainstream engineering, motor and generator that works this way.
It's definitely a resonance machine. It's really quite unique. There are No magnets, no copper windings on the rotor, no commutator, no slip rings.
It works on the principle of what they used to call a multi-vibrator.
The main oscillator is a tank circuit. The rotor causes the inductance to go up and down at same rate as the rpm of the rotor. This creates small voltage in primary coil; which, as soon as it starts to build up, it goes into resonance and beings to generate high voltage pulses. The high voltage pulses are transformed into low voltage, high current output pulses.
It's a transformer and it also works on mechanical resonance, which is a result of an electrical resonance. So it's actually mechanical motion that creates the high voltage pulses; then, from that point, it's more of a conventional transformer action. So the initial, very large inductance that gets excited by the mechanical motion of the rotor; and once that excitation begins, the voltage goes up very rapidly into the kilovolt range, and those large kV pulses drive the output.
This generator does not run at 60/50 hz. It runs at 400 hz. As for start up, James says that the HV coil or primary coil is about 40 henries, that is a very long wire. When the rotor passes by the it changes the inductance to about 30 henries. That swing in inductance is enough to generate a voltage that will increase until resonance is achieved. The the primary will start oscillating at 400 hz and then it works as a transformer converting 25000 volts at 400 hz to 240 volts at 400 hz.
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