Eddy current effects on the stability of an active magnetic bearing levitated rotor
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The authors have developed sophisticated algorithms to predict the closed response and stability of active magnetic bearing (AMB) supported rotors. The rotor is modeled with an arbitrary number of finite elements while the feedback components-controller, power amplifier, actuators and sensors are given state space variable representations derived from their measured or predicted transfer functions. Correlation between test and theory has consistently shown an over prediction of active damping with both laminated and solid sleeve rotors. This paper shows the improvement in correlation achieved by including eddy current/hysteresis lag and rolloff effects in the simulation model. The eddy current/hysteresis characterizations are derived from test and from finite element field simulation. Results are provided for a vertical laboratory rotor and a horizontal gas turbine engine simulator.
author list (cited authors)
Kim, C., Palazzolo, A. B., Tang, P., Manchala, D., Kascak, A., Brown, G., Montague, G., & Klusman, S.