A sample of this motor:
[https://www.youtube.com/watch?v=LXBYMiNH1nE](https://www.youtube.com/watch?v=LXBYMiNH1nE)
In: 87
They “work” but they are pointless…
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Putting aside that there is no 100% efficient machine….
We could make a motor that could run forever. But why?
There would be no reason to do so. We but in the energy to make it spin and it would store that energy forever. But as soon as we want that energy back it would stop.
There are some kinetic batteries that store energy in flywheels with very good lubrication. Or pumping water up into a reservoir with excess energy and letting the water flow down when we need that energy back.
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As for efficiency, there can be no 100% efficient machine, there is always some energy lost when you convert types of energies. The closest would be a flywheel in space in a vacuum spinning accelerated with electro-magnets
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