Stabilization of rotation of non-controlled magnetic levitation motor by misoriented HOPG disk.

Abstract

　HOPG means highly oriented graphite. The HOPG plate is effective for realizing a non-controlled diamagnetic magnetic levitation motor at room temperature. The authors have found a way to improve the HOPG disk required for non-controlled diamagnetic magnetic levitation to further enhance axial stability. It was demonstrated that the stability in the radial direction is increased by composing the HOPG disc with two types of HOPG block in which the orientation of the HOPG block differs by 90 degrees. This discovery was made possible by deriving an equation that approximates the benzene ring of graphite to a ring current.