SOLID POLE LOSSES IN SYNCHRONOUS MACHINES FED BY NON-SINUSOIDAL CURRENT WAVES

Abstract

Abstract Solid pole synchronous machines fed by current inverters are generally subjected to high pole face eddy-current losses. This paper describes a method which uses a conducting layer at the surface of solid salient poles to reduce these losses. For a given stator geometry and a fundamental frequency there may exist an optimal thickness of conducting layer that minimizes the losses. We calculate the losses by a simple analytical method. As a result we are able to define, in the stator geometry plane, a region where the conducting layer is beneficial. Outside this region the conducting layer may be detrimental. The domain's variations are investigated as a function of the fundamental frequency and the material. Parameters.