Accurate Calculation and Reduction of Losses in Fractional Slot Concentrated Winding Permanent Magnet Machines

Fractional slot concentrated winding permanent magnet (FSCW-PM) machines face challenges of increased losses and computational complexity due to their unique structure and the presence of harmonics in the air gap. The accurate calculation and reduction of the losses in different parts of a FSCW-PM machine are investigated. Initially, two-dimensional (2D) and three-dimensional (3D) models of the machine are constructed to study the impact of segmented magnets on permanent magnet (PM) eddy current loss of and core loss. Subsequently, a detailed model of all individual wires within a single slot is performed to accurately calculate the AC copper loss and separate the factors contributing to the loss. Finally, based on the preceding analysis, the machine structure is modified to reduce losses. By conducting a comprehensive study of loss characteristics, this paper aims to contribute to the design and optimization of high-efficiency FSCW-PM machines.