Stability Analysis of Rotor Supported by Anisotropic Active Magnetic Bearings

Magnetic bearing has some stability problems at high speed rotation such as gyroscopic and inductive coupling effect. In this paper, high speed rotor supported by anisotropically controlled magnetic bearings is analized, and damping property and stable region are calculated by using root locus diagram. From the analysis, anisotropical controller stabilizes the inductive coupling effect drastically. It sometimes affects adversely to the gyroscopic effect. This idea is applied to a 3 mass flexible rotor supported by 2 magnetic journal bearing systems, and its capability is tested.