To create the moving magnetic field you need two DC EM solenoids wound like a bifilar coil. You pass two different currents at different pulsed timings through the two coils. The result is a moving magnetic field in one direction which is a sudo, all positive, wave.
The core, copper, is induced with a current, it is a loop shorted, the currents circulate, very high currents. These currents induce an equal field back at where the inducing field came from, but WITH GAIN, as SM said, it runs with gain.
The pick up coils are wound with the inducing coils, therefore the solenoid coils are trifilar. You now have a linear DC generator "basicly speaking".
Mike
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