The damper (or amortisseur) winding of synchronous motors (SMs) is a critical component required for starting the motor. Several cases of the forced outage of industrial processes due to the starting failure of salient-pole SMs caused by damper bar failure have recently been reported. The detection of broken damper bars is difficult since they are active only during rotor acceleration, and offline visual inspection is the only means of testing available in the field. It was recently shown that the broken damper bars can be detected from the airgap flux, but this requires the installation of airgap flux sensors inside the motor. In this article, a method based on the analysis of the stator starting current is proposed for detecting broken damper bars. In addition, an electrical detection method based on signal injection from the motor terminals is proposed. The new methods have been devised to provide remote testing from the motor control center without motor disassembly required in existing tests. Finite-element analysis (1 MW) and experimental testing (30 kW) performed on salient-pole SMs with emulated broken damper bars show that the proposed methods can provide the sensitive and reliable detection of damper bar failures.

中文翻译：

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无需拆卸电机的凸极同步电机阻尼条状态的电气监测

同步电机 (SM) 的阻尼器（或减振器）绕组是启动电机所需的关键部件。最近报道了几起因阻尼杆故障导致凸极 SM 启动故障而导致工业过程被迫停运的案例。检测损坏的阻尼杆很困难，因为它们仅在转子加速期间有效，离线目视检查是现场可用的唯一测试手段。最近的研究表明，可以从气隙通量中检测到损坏的阻尼杆，但这需要在电机内部安装气隙通量传感器。本文提出了一种基于定子启动电流分析的阻尼杆断裂检测方法。此外，提出了一种基于电机端子信号注入的电气检测方法。新方法旨在提供从电机控制中心进行的远程测试，而无需在现有测试中拆卸电机。有限元分析 (1 MW) 和实验测试 (30 kW) 对具有模拟断裂阻尼杆的凸极 SM 进行了表明，所提出的方法可以提供灵敏可靠的阻尼杆故障检测。