This work investigates the establishment of steady-state eddy currents in solid and laminated salient poles and rotor rim of synchronous machines due to a periodic excitation voltage. It shows that the presence of eddy currents in the rotor magnetic circuit has the double effect of increasing the excitation winding AC-resistance and decreasing its magnetizing AC-inductance. According to that a simple analytical model is presented in here which allows a rapid rough estimation of the excitation winding AC-resistance when little information is available about the machine geometry and its electric/magnetic materials properties. The model is then verified by reproducing in frequency the excitation winding AC-resistance and the related power loss measured in two synchronous generators. Finally, the limits of reliability and applicability of the model are discussed. The model has implications for periodic field winding current control and voltage regulation in synchronous machines.

中文翻译：

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涡流对实心和叠片凸极同步电机励磁绕组阻抗的影响

这项工作研究了由于周期性励磁电压而在同步电机的实心和叠​​片凸极和转子边缘中建立稳态涡流的问题。这表明转子磁路中涡流的存在具有增加励磁绕组交流电阻和降低其励磁交流电感的双重作用。据此，这里提出了一个简单的分析模型，当关于机器几何形状及其电/磁材料特性的信息很少时，该模型允许对励磁绕组交流电阻进行快速粗略估计。然后通过频率再现励磁绕组交流电阻和在两个同步发电机中测量的相关功率损耗来验证模型。最后，讨论了模型的可靠性和适用性的限制。该模型对同步电机中的周期性励磁绕组电流控制和电压调节具有重要意义。