采用整流技术的变频供电感应电机转子断条故障诊断方法

doi:10.19595/j.cnki.1000-6753.tces.210303

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摘要电机定子电流信号易受变频器电力电子开关器件和电磁干扰的影响,现有解调技术又存在计算量大的问题,为此,该文提出一种变频器供电侧电流与整流技术相结合的感应电机转子断条故障诊断方法。所提方法依据开关函数和调制理论,首先建立了变频器供电侧电流解析表达式。其次利用整流技术对变频器供电侧电流进行处理,将特征频率从传统的边带频率转化为转子断条故障特征频率,有效地抑制了电源基频频谱泄漏的影响,从而实现电机在轻载或空载运行工况下的转子断条故障诊断。最后采集变频供电感应电机不同负载运行工况下供电侧电流数据进行验证。实验数据分析表明,所提方法能够提取从空载到重载不同运行工况下的转子断条故障特征分量,有较高的稳定性,而且所需计算量少,容易实现。

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关键词 ：感应电机, 故障诊断, 转子断条, 供电侧电流, 整流技术

Abstract：The stator current signal of the inverter-fed induction motor (IM) is easily affected by noises from the switching process of electric power electronic devices and electromagnetic interference. Additionally, the existing demodulation methods have the problem of a large amount of calculation. Therefore, this paper proposes a broken rotor bar (BRB) fault diagnosis method in IMs using the rectified supply-side current. First, an analytical expression for the supply-side current is established by the switching function and modulation theory. Secondly, the rectification technology is used to process the supply-side current. It is shown that the spectrum of the rectified supply side current can convert the traditional sideband frequency to BRB fault characteristic frequency. Thus, the influence of the fundamental frequency is effectively suppressed, and the BRB fault diagnosis in IMs under the condition of light load or no-load is realized. Finally, the proposed method is verified by the current data of the power supply side of the inverter-fed IM under different load conditions. The results demonstrate that the proposed method can effectively identify the BRB fault characteristic frequency from no-load condition to high load condition with high reliability, requires less computation requirements, and is easy to implement.

Key words： Induction motor fault diagnosis broken rotor bar faults supply-side current rectification technology

收稿日期: 2021-03-11

PACS:

TM343

基金资助:国家自然科学基金项目（52007078）、江苏省高等学校自然科学研究面上项目（19KJB470017）和江苏省双创博士计划项目资助

通讯作者: 宋向金,女,1989年生,博士,讲师,硕士生导师,研究方向为电机状态监测与故障诊断。E-mail: songxiangjin@ujs.edu.cn

作者简介: 王万丁,男,1996年生,硕士研究生,研究方向为电机故障诊断以及信号处理。E-mail: 2211907030@stmail.ujs.edu.cn

引用本文:

王万丁, 宋向金, 陈前, 赵文祥, 祝洪宇. 采用整流技术的变频供电感应电机转子断条故障诊断方法[J]. 电工技术学报, 2022, 37(16): 4074-4083. Wang Wanding, Song Xiangjin, Chen Qian, Zhao Wenxiang, Zhu Hongyu. Broken Rotor Bar Fault Diagnosis in Inverter-Fed Induction Motors Using the Rectification Technology. Transactions of China Electrotechnical Society, 2022, 37(16): 4074-4083.

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