Dynamic characteristic simulation of active magnetic bearings.

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The step response in the axial direction of a rotor suspended by five axis-controlled active magnetic bearings was measured and compared with two kinds of numerical simulations: the Simple model, and the FEM model. Tests were performed on a large rotor displacement which exceeded the linear range of the design condition. The agreement of the simulated results of the FEM model with those of the experiment was better than with those of the Simple mode. Factors considered only by the FEM model were two-dimensionality of the magnetic field including leakage flux, voltage-current characteristics of the control coil, nonlinear magnetic characteristics of the pole pieces (B-H curve), and eddy currents. The most influential factor was the magnetic leakage flux which increased the induced voltage and the time constant of the control coil.

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