This article presents a simple model for the calculation of core losses in permanent magnet machines based on the total flux linkage of the stator winding. In reality, the total core losses will vary as a function of permanent magnet field and the combination of $d-q$ current components even in the case when different $d-q$ currents produce the same amount of stator winding flux linkage at a given speed. The classical model with constant equivalent core loss resistance predicts constant core losses for constant flux linkage which leads to incorrect results. The model presented in this paper expands the classical core loss resistance based model with a novel additional term which corrects the classical model and calculates an additional core loss component as a function of $d$ axis current, total flux linkage of the stator winding, and two constant parameters. The accuracy of the model is confirmed by finite element simulations and core loss measurements for the cases of an interior permanent magnet traction motor and an industrial surface permanent magnet motor (only simulations).

中文翻译：

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计算永磁电机铁损的新经验模型

本文提出了一个简单的模型，用于根据定子绕组的总磁链计算永磁电机的磁芯损耗。实际上，总铁芯损耗会随着永磁场和以下因素的组合而变化$dq$ 电流组件即使在不同的情况下 $dq$电流在给定速度下产生相同数量的定子绕组磁链。具有恒定等效磁芯损耗电阻的经典模型预测恒定磁链的恒定磁芯损耗，这会导致不正确的结果。本文中提出的模型扩展了基于经典磁芯损耗电阻的模型，并使用了一个新的附加项来校正经典模型并计算附加磁芯损耗分量作为$d$轴电流、定子绕组的总磁链和两个常数参数。模型的准确性通过有限元模拟和铁损测量对内置式永磁牵引电机和工业表面永磁电机（仅模拟）进行了确认。