The mechanics of an active magnetic bearing (AMB) is explained by presenting a practical AMB control scheme. The scheme comprises three parallel feedback loops to achieve dynamic stiffness, static stiffness and damping. These AMB properties are presented for rotor/bearing designers in closed-form functions of exciting frequency and several electronically adjustable parameters. Furthermore, the scheme is translated into a set of first-order differential equations. Combining the AMB formulation with the conventional finite element rotordynamics formulation, a rigorous electromechanical system model is established for forced response and stability analyses.
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H. Ming Chen (1989) studied this question.
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