Iterative 2D Magnetostatic Analysis with Analytical Postprocessing for Accurate AC Copper Loss Calculation in Hairpin Winding PMSMs

초록

This paper presents an iterative magnetostatic method with analytical postprocessing for calculating alternating current (AC) copper losses in hairpin-wound permanent magnet synchronous machines (PMSMs). Conventional magnetostatic solvers are accessible but cannot capture field changes from eddy currents, while transient finite element analysis (FEA) tools are often commercially restricted. The proposed method uses time-stepping magnetostatic FEA, solving multiple problems per step, with each iteration refining current distributions to account for nonlinear eddy current effects. It is compared with a standard magnetostatic method and transient FEA. Results show improved accuracy over static methods with increased computation time, providing a practical alternative to commercial transient solvers. © 2025 Korean Institute of Electrical Engineers Electrical Machinery and Energy Conversion Systems Society.

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