Application of a Computationally Efficient Air-Gap Element within the Finite Element Analysis of Magnetic Bearings

摘要

The paper presents finite element analyses of radial magnetic bearings where non-centered rotor positions are considered very efficiently. With an introduction of a reformulated air-gap macro element, distinct stator and rotor models can be used and remeshing of the air-gap is avoided. Therefore, static and dynamic rotor eccentricities are considered very easily. The force-current relationships for a typical design of a radial magnetic bearing with four pole pairs in two orthogonal directions are evaluated with both conventional calculations and analyses using the eccentric air-gap element.