Abstract
Active magnetic bearings (AMBs) offer considerable benefits compared to conventional bearings. On the other hand, AMBs require backup bearings to avoid damage resulting from a failure in the component itself, in the power system, or in the control system. During a rotor-bearing contact event, the structure of the backup bearings has an impact on the dynamic actions of the rotor. In this paper, the dynamics of an AMB-supported rotor during contact with backup bearings is studied with a simulation model. Modeling of the backup bearings is done using a comprehensive cageless ball bearing model, which includes the effect of misalignment. The elasticity of the rotor is described using the finite element method. Verification of the model for misaligned cageless ball bearings is done by comparing the simulated results to measurements. The verified model of the backup bearings is found to correspond to the features of a real system.
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