Reminds me of one of the motor generator experiments about a year ago. It was a poking around built so I am not looking into this now. One
condition resulted in the wood platform moving around on the floor. It did not seem to be all vibration. At higher speed it would crawl around
as far as the wires would take the thing there seemed to a small space a couple of millimeters underneath. Since that condition the other builds
have not done this so I really do not have a clue what happened exactly.