Originally posted by bistander
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Is it free energy that is powering the rotor? It depends on your point of view, we did pay for it by putting the original current in the motor, so in that sense it is not free, but as work is done both by the current in the field coils and the current in the rotor we do have twice the working current for one input. I believe this transformer action to be very important as both the input and the output of a transformer is doing magnetic work.
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