Analysis of eddy current loss on permanent magnets in PMSM with fractional slot

The analysis of the eddy current loss in the permanent magnet (PM) is an important research topic of the PM motor. PM eddy current loss in PMSM with fractional-slot concentrated winding (FSCW), which has ample harmonics exist in the air gap field, is an urgent problem needed to be solved. A FSCW-PMSM with 24-slot-16-pole two-dimensional model of PM eddy current loss is established by using the finite element method (FEM). The motor winding MMF and harmonic of air gap flux density is analyzed. According to the mathematical model of PM eddy current loss, this paper has calculated the main space harmonics loss generated on one PM. Under the rated-load condition, the influencing factors of PM eddy current loss are analyzed. From the above analysis this paper has adopted effective methods to reduce the PM eddy current loss.