I've been thinking about an idea for a while now... what if you take a rail gun set up and instead of shooting something you turn it into a motor. Just make the rails into hoops that almost touch and connect the armature to a point in the center of this. I'm wondering how armature (now a rotor) will react once it picks up speed. Will it go faster and faster because of the speed it gained from its previous revolutions? I don't know too much about how much power needs to go into these to produce a useful magnetic field... can anyone elaborate?