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Thermal performance of a flux-switching permanent magnet machine for an integrated starter generator in hybrid electric vehicles

This paper investigates the thermal performance of a three-phase 10kW flux-switching permanent magnet (FSPM) machine used as an integrated starter generator (ISG) for hybrid electric vehicles, where the temperature rise experiments are conducted under different operating conditions. Also, the thermal analysis of the FSPM machine is simplified into one-dimensional steady heat conduction with two heat sources in cylindrical coordinates. In addition, an analytic formula for temperature distribution of the FSPM machines is proposed and verified by thermal finite element method (FEM) analysis. Finally, optimizations on the cooling system are conducted by analytical calculations and verified by computational fluid dynamics (CFD) predictions.