This paper presents a novel method to estimate the number of shorted turns in a permanent magnet synchronous machine (PMSM) following the detection of interturn short-circuit (ITSC) fault and its location. In this proposed method, PMSM is excited through a low sinusoidal voltage at standstill condition to obtain the winding resistance and synchronous inductance by current response. It is shown that the ITSC fault introduces variation in the current response, which can be used to calculate the number of shorted turns under zero fault resistance assumption. Using this practical procedure, the fault severity can be estimated directly in a straight-forward manner. In other words, the severity estimation for a given machine can be done without complex machine modeling or experiments on ITSC prototype with multiple taps. The findings in this paper are essential for a comprehensive solution including fault mitigation algorithms and postfault operations. In order to verify the findings, a three-phase equivalent circuit model supported by finite element analysis results is used to take saturation and space harmonics into account. In addition, experimental results are presented to demonstrate the validity and practicability of the severity estimation.

中文翻译：

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PMSM匝间短路故障严重程度估计


本文提出了一种在检测匝间短路 (ITSC) 故障及其位置后估计永磁同步电机 (PMSM) 短路匝数的新方法。在该方法中，PMSM 在静止状态下通过低正弦电压激励，通过电流响应获得绕组电阻和同步电感。结果表明，ITSC 故障引入了电流响应变化，可用于计算零故障电阻假设下的短路匝数。使用这个实用程序，可以直接以直接的方式估计故障严重性。换句话说，无需复杂的机器建模或在具有多个抽头的 ITSC 原型上进行实验，即可完成给定机器的严重性估计。本文的研究结果对于包括故障缓解算法和故障后操作在内的综合解决方案至关重要。为了验证研究结果，使用由有限元分析结果支持的三相等效电路模型来考虑饱和度和空间谐波。此外，实验结果证明了严重性估计的有效性和实用性。