Abstract
The repulsive-type magnetic bearing can support the rotating shaft without contact by utilizing the repulsive force between magnets. In order to suppress the vibration of the overhung rotating shaft, a vibration suppression device without contact is desired, and this repulsive-type magnetic bearing is suitable for that. This paper investigates the vibration suppression methods by controlling the axial displacement or magnetic flux density of the outer magnet of the repulsive-type magnetic bearing. Especially, the method by controlling the axial displacement of the outer magnet indicates desirable vibration suppression effects for both stationary and nonstationary vibrations at the major critical speed. Moreover, the optimization for controlling the axial displacement of the outer magnet is performed.
