Magnetic levitation of a flexible steel plate with a vibration suppressing magnet

A magnetic levitation system that has a vibration suppressing electromagnet which use only the velocity of the levitated object for the control has been studied. The proposed system has advantages of the stable levitation of a flexible steel plate which moves with time under the fixed electromagnets. The simulation of levitated plate's response using finite element method and the magnetic levitation experiments using such a vibration suppressing magnet were carried out. The results show the vibration suppressing magnet is able to control the low frequency natural vibration effectively, and a notch filter is able to avoid the excitation of the high frequency natural vibration.