[E. Pluribus Unum]

As long as you have a paramagnetic surface to hover over, you’re golden.

[Blood of Tyrants]

I think it works by an effect caled eddy currents. Whenever a magnet is moved towards or across a conducting, non-magnetic surface, it generates currents inside the metal which repel the magnet. Hook some wires and a load to the metal surface and you have a generator.