Abstract
The dynamic characteristics of an active magnetic bearing-rotor system were investigated by considering the nonlinearity of electromagnetic force and current saturation. This chapter used the harmonic balance method to obtain approximate solutions containing all information of static equilibrium, vibration amplitude, and phase. Based on the solutions, dynamic characteristics of the system were illustrated. It was found that there existed bifurcation behavior, and the cause lies in the static equilibrium rather than vibration amplitude. There were multiple static equilibria in the system, and non-contact support of active magnetic bearing created physical condition for the existence of nontrivial equilibria. The supercritical pitchfork bifurcation of static equilibrium with respect to excitation amplitude occurred, which made system performance deteriorate, and even threatened system stability. In the end, the analysis results were validated numerically.
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