Perpetual movement devices, if ever possible, would need to generate their own power to exist and function; whatever that would be. To think that one would be able to use part of its energy output is pure heresy. This source would have to be able to produce more than what it takes to keep it going and the energy quantity left would be infinitesimal. To work as an energy milk cow this device would have to be the size of a planet, again if ever... Hey we could use the planet's rotational inertia, but then again, that's not perpetual.
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