Hi guys
I agree with the idea that driving a coil to impede the flux path is a
difficult task. I have worked with dc brushless motors and the motor
stator permeability is a problem for high torque with small motors.
As I see it the objective of the meg is not to totally stop the flux
path but to reduce it just prior to reaching core saturation. Any
change in flux will result in a change in secondary output.
I do believe that true over unity can be achieved with the new
materials being invented with a crystalline structure that could shift
polarity and hinder a flux path with a small current applied.

Dave