Comparative Analysis of Eddy-Current Loss in Permanent Magnet Synchronous Machine Considering PM Shape and Skew Effect Using 3-D FEA

In this paper, eddy-current loss in permanent magnets (PMs) due to the armature reaction field of a PM synchronous machine was analyzed. Various techniques, including numerical techniques such as finite element analysis (FEA), enable the accurate prediction and analysis of magnetic field distribution with saturation effects. Furthermore, the eddy-current loss can be easily analyzed using a commercial software. 3-D FEA is essential when considering the stator skew effect. In particular, the influence of time harmonics in armature current and space harmonics due to distributed magnetomotive force on the eddy current loss is thoroughly investigated and discussed on the basis of 3-D FEA.