Magnetic Bearings
While researching a motor driver that I’m using out in the shop I stumbled across this extremely interesting video showcasing what is basically a magnetic bearing. He uses three of the same 24V 12A motor controllers that I am using, but he is using his to generate a magnetic field that keeps a payload a certain distance from the metallic structure at all times. No physical connection == frictionless bearing, assuming one ignores the air.
-Lace