Abstract
The paper proposes a technique for a numerical determination of power characteristics of active magnetic bearings (AMBs), taking into account control laws. It is based on an application of the finite element method for analyzing static electromagnetic fields. Electromagnetic forces are calculated using the Maxwell's stress tensor. As an example, two types of bearings are considered with the given control laws. These are an axial AMB of a bilateral action with stators in the form of pot cores and a radial AMB with an eight-pole stator. The results of computational studies for a determination of the dependences of forces and stiffness coefficients on a rotor displacement for various control parameters are given. A practical applicability of the methodology for calculating the base force and stiffness characteristics of AMBs is proved by comparison with experimental data. The technique can be used for a selection of rational or optimal AMB parameters and parameters of the control laws for them.
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