Hi Luc I would say that the difference of loaded and unloaded is Lenz. When unloaded there is no Lenz at all and so the power draw is the true draw with the "magnetic drag" as the rotor passes over the stator. This drag goes away with a load, why? well the lenz return to the rotor has been switched from being against to being in favour, this has happened in the dead area "rotor not over the stator", in this area the flux direction has changed. I also think that frequency "rpm" has a lot to do with it as well, maybe the faster it is the greater the benefit, or as has been stated else where, there is a frequency relation to the length of rotor and stator, the stator being a full wave length and the rotor 1/2 wave length, or maybe any tuned ratio between them so not causing standing waves. It's literally all in the tuning regards Mike
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