For what it's worth, pretty much all ceiling fans work this way. They are brushless and both the stator and the rotor use copper windings instead of permanent m

For what it's worth, pretty much all ceiling fans work this way. They are brushless and both the stator and the rotor use copper windings instead of permanent magnets. The trick here is that ceiling fans get the necessary voltage switching for free since they run on AC. With DC you're going to have to have do that with electronic switching.