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3D-FEM calculation of electromagnetic properties of single phase induction machines

This paper deals about a 3D-FEM calculation of single phase induction machines. The modeling of the machine with respect to symmetries and machine characteristics will be described and the obtained results by the 3D-FEM-calculation will be compared with measurement data of a test machine. Furthermore the reasons why only the results obtained from a 3D-FEM calculation and not the results of a 2D-FEM calculation are acceptable will be described too. The main reason is the elliptic magnetic field especially during the start up of the machine [1]. Because of this special feature of single phase induction machines the skewed rotor must be modeled by a 3D-Model or the effects of the skewing will be considered by a 2D-FEM calculation by using a multi-slice technique [2].