EVALUATION OF FAULTS IN THE SQUIRREL CAGE THREE-PHASE INDUCTION MOTORS

Revista Ingenierias Universidad de Medellin Pub Date : 2021-12-06 DOI:10.22395/rium.v21n40a8

Daniel Maestre-Cambronel, J. P. Rojas, J. Duarte-Forero

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Abstract

Induction motors have played a central role in the techno-economic development of modern industries and electric power generation. However, the presence of recurring failures hinders a cost-effective performance and leads to catastrophic damage. Therefore, the present study proposed an assessment to investigate the influence of two types of failures in induction motors, namely failure due to broken bars in the rotor and defects in the connection between the rotor bars and the end ring. Accordingly, a three-phase induction motor was evaluated under different failure conditions that modified the operational torque and rotational speed. The results indicated that both types of failures magnify both the core and copper power losses by up to 13.3 % and 8 %, respectively, compared to the healthy condition. On the other hand, an efficiency reductionbetween 1.94 % to 3.41 % is an indication of failure progression. Finally, the appearance of harmonics 3 and 7, and the intensified magnitude of harmonic 5, represent a clear sign of failure occurrence related to rotor barsand defects in the connection to the end ring. In conclusion, the proposed methodology proved to be an adequate tool to predict failure appearance, which has a direct impact on extending the lifetime of induction motors.

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鼠笼式三相异步电动机的故障评定

感应电动机在现代工业和发电的技术经济发展中起着核心作用。然而，反复出现的故障阻碍了经济有效的性能，并导致灾难性的破坏。因此，本研究提出了一种评估方法来研究两类故障对感应电动机的影响，即转子断条故障和转子棒与端环连接缺陷。基于此，对三相异步电动机在不同故障条件下的运行转矩和转速进行了评估。结果表明，与正常情况相比，这两种类型的故障分别使铁芯和铜的功率损耗增加13.3%和8%。另一方面，在1.94%到3.41%之间的效率降低表明故障进展。最后，谐波3和7的出现，以及谐波5的增强幅度，代表了与转子棒和端环连接缺陷有关的故障发生的明确迹象。总之，所提出的方法被证明是预测故障外观的适当工具，这对延长异步电动机的使用寿命有直接影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Revista Ingenierias Universidad de Medellin

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50 weeks