he recent growth of magnetic bearing applications in the chemical, utility and aerospace industries requires more accurate design tools to insure reliable and effective operation as components of the overall rotor bearing system. Vibrations of magnetic bearing supported or active vibration controlled rotors are affected by the stiffness, mass, damping and external force factors of conventional rotors plus the dynamics of the control-feedback components, i.e. sensors, controllers, power amplifiers and actuators. The coupled electromechanical system (EMS) then governs critical speeds, unbalance response and stability. This system response is especially sensitive to eddy current induced fields as revealed by the results of this dissertation.;This dissertation combines eddy current field modeling with rotor and EMS modeling to examine the effects that eddy currents may have on overall system closed loop stability. The methodology is confirmed via a gas turbine engine simulator rig, with a single magnetic bearing. Time harmonic magnetic field simulations are conducted to predict the eddy current induced field lag effect, as characterized by a ;Since a third order transfer function (TF) showed the most accuracy in fitting the measured and simulated
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