Gravity is the word we humans use to represent what is actually curvature in space-time. Calling it a form of energy is roughly as correct as calling a hill a source of energy. You may get energy out of it by rolling an object down it, but the process gives no more energy out of it than you put in (less, when you count friction and other losses).
Magnets work on exactly the same principle I might add. Anything you get out of them is no greater (and pretty much unavoidably less actually) than what you put in. They're not infinite batteries in any way, shape or form any more than a gravity well is an infinite battery.
In other words if you take two objects and put one on the left and one on the right without lifting it you used energy to do that work but the two objects that you moved has no potential energy whatsoever yet gravity is appying a constant force on those two objects.
You didn't answer my question. So it takes ZERO energy to keep the planets from flying off into space?
Then the magnets serve no purpose, because the electric energy needed to keep the rotor spinning is by neccessity going to be at least equal (due to resistance, friction etc) to the repellation force of the magnets, or the rotor would stop on its own.
Also, as soon as you load the axle the motor would of course stop spinning. ...Unless you ramp up on the electric current, of course like with any ol' electric motor we've designed and built in the last ~150 years-ish.
The pendulum of a clock swings with very little energy because there's almost no resistance to its movement.
The inventor disagrees and has a machine that shows a motor accelerates under load using special HV coils.