Characteristics of Electromagnetic Systems of Magnetic Bearings Biased with Permanent Magnets

Two electromagnetic systems interact each other in the active magnetic radial bearings that are combined with permanent magnets to provide bias force and electromagnets to supply control force. The characteristics are studied when a single electromagnet system is excited by a sinusoidal input with fixed working airgap. The frequency characteristics of incremental fluxes are measured in the exciting and non-exciting magnetic systems. The experimental results are compared with the numerical results based on an analysis, to check the validity of the analysis giving a deeper understanding of the complicated magnetic systems.