If you had a generator in a vacuum with a magnetically levitated rotor and power was drawn from the system by induction, use your imagination on the design of the device, but my question is: Where are the flaws in this concept? (Since perpetual machines are theoretically impossible). In other words, where are frictional forces found in this system and where does conservation of energy come into play? (eddy currents? Leakage?) To further elaborate, if you gave this device an initial spin (think of it like a spinning-top) and no friction is involved then it would never stop spinning. So again, where's the friction/apposing force in this system?