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Motional magnetic finite element method applied to high speed rotating devices

Electromagnetic devices involving motional effects are commonly simulated using transient models. Transient finite element simulation techniques have to remesh the geometry, to choose an appropriate time step scheme and to cope with excessive computation times. In the case of moving bodies retaining the original geometry, these problems can be avoided by using a motional formulation. The B v× velocity term is included in the differential equations. Here, some disadvantages of this motional finite element method considering high speed rotating devices are discussed. The oscillations observed for the standard Galerkin method applied to models at higher speeds, are overcome by applying upwind techniques. External electric circuits required to model realistic devices, are considered by additional integral equations.