The aim of this paper is to analyze the performance of a three-phase wound-rotor induction motor (WRIM) under rotor windings asymmetry. The dynamic performance of the WRIM under healthy and rotor windings asymmetry with one-open-phase fault conditions is analyzed using a dynamic model in the ABC frame. Under opening one phase of the rotor windings, the WRIM suffers from operation at a speed near to the half of its synchronous speed, which is known as the Georges phenomenon. The behavior of the WRIM is simulated and investigated experimentally under faulty conditions for four different possible connections of rotor windings. The stator and rotor currents are analyzed using fast Fourier transformation technique to identify the fault signatures. The results prove that under opening one phase of the rotor windings the WRIM suffers from pulsating electromagnetic torque, high oscillatory stator currents and high unbalanced rotor currents. Also the results prove that the performance of the motor under rotor windings asymmetry conditions and the occurrence of Georges phenomenon depend on the type of connection of the rotor windings and fault location. Therefore, the authors suggest a special delta connection for the rotor winding to reduce the effects of this phenomenon. The simulation and experimental results show good agreement and prove the validity of the suggested delta connection.

中文翻译：

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三相绕线转子感应电动机Georges现象的动力学研究

本文的目的是分析转子绕组不对称下三相绕线转子感应电机 (WRIM) 的性能。使用 ABC 框架中的动态模型分析了 WRIM 在健康和转子绕组不对称以及单相故障条件下的动态性能。在打开转子绕组的一相时，WRIM 会以接近其同步速度一半的速度运行，这被称为乔治现象。在转子绕组的四种不同可能连接的故障条件下，对 WRIM 的行为进行了模拟和实验研究。使用快速傅立叶变换技术分析定子和转子电流以识别故障特征。结果证明，在打开转子绕组的一相时，WRIM 会受到脉动电磁转矩、高振荡定子电流和高转子不平衡电流的影响。结果还证明，电机在转子绕组不对称条件下的性能和乔治现象的发生取决于转子绕组的连接类型和故障位置。因此，作者建议转子绕组采用特殊的三角形连接，以减少这种现象的影响。仿真和实验结果显示出良好的一致性，并证明了建议的三角形连接的有效性。结果还证明，电机在转子绕组不对称条件下的性能和乔治现象的发生取决于转子绕组的连接类型和故障位置。因此，作者建议转子绕组采用特殊的三角形连接，以减少这种现象的影响。仿真和实验结果显示出良好的一致性，并证明了建议的三角形连接的有效性。结果还证明，电机在转子绕组不对称条件下的性能和乔治现象的发生取决于转子绕组的连接类型和故障位置。因此，作者建议转子绕组采用特殊的三角形连接，以减少这种现象的影响。仿真和实验结果显示出良好的一致性并证明了所建议的三角形连接的有效性。