永久磁石を用いた反発浮上形磁気軸受の回転振動特性

A permanent magnet bearing system has been fabricated in our laboratory that utilizes the repulsive forces operating between the stator and rotor permanent magnets for the levitation without any radial control. Usually a magnetic bearing system characteristically has constant stiffness in the radial direction and is soft at steady position. Therefore, it is required to determine the rotor vibration conditions at high rotational speed. This paper discusses the attenuation of vibration for axial and radial disturbances in this system. The rotor runs through the critical speed effectively owing to the soft stiffness.