Submersible motors are widely used in industry, agriculture, and life. Despite their safety and efficiency, submersible motors suffer from a harsh working environment. Overheating and overload may cause seal damage to make sediment flood in, which will lead to bearing faults. Meanwhile, due to the particularity of the working environment of submersible motors, the traditional method of detecting bearing faults through vibration signals is challenging to implement. In this paper, a numerical model based on the eccentricity analysis method is proposed to simulate the bearing faults process of submersible induction motors so that electrical signals, including air gap flux density and exciting force, could be obtained to diagnose the bearing faults. The proposed approach is capable of approximately simulating the motion orbit of the rotor origin when a single point fault occurs. Then, the 2D Fourier decomposition method is used to analyze the influence of rotor deflection on air gap flux density and exciting electromagnetic force from order and frequency. Finally, the proposed model is tested and proved efficient by analyzing the emerging fault harmonic components. © 2022 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

中文翻译：

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潜水感应电机单点轴承故障分析的数值模型

潜水电机广泛应用于工业、农业和生活中。尽管潜水电机具有安全性和效率，但其工作环境恶劣。过热和过载可能导致密封损坏，使泥沙涌入，从而导致轴承故障。同时，由于潜水电机工作环境的特殊性，传统的通过振动信号检测轴承故障的方法难以实施。本文提出了一种基于偏心分析方法的数值模型来模拟潜水感应电机的轴承故障过程，从而获得气隙磁通密度和激振力等电信号来诊断轴承故障。当发生单点故障时，所提出的方法能够近似模拟转子原点的运动轨道。然后，利用二维傅里叶分解法从阶次和频率分析转子偏转对气隙磁通密度和励磁电磁力的影响。最后，通过分析新出现的故障谐波分量，对所提出的模型进行了测试并证明了其有效性。© 2022 日本电气工程师学会。由 Wiley Periodicals LLC 出版。© 2022 日本电气工程师学会。由 Wiley Periodicals LLC 出版。© 2022 日本电气工程师学会。由 Wiley Periodicals LLC 出版。