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Alternative TitleFault diagnosis of broken rotor bars of inverter-fed squirrel-cage induction motor at no-load using supply-side current based on Hilbert demodulation technique
祝洪宇; 胡静涛; 高雷; 黄昊
Source Publication仪器仪表学报
Indexed ByEI ; CSCD
EI Accession number20141017420152
Contribution Rank1
Funding Organization中国科学院重点部署项目(KGZD-EW-302)资助
Keyword鼠笼电机 希尔伯特变换 解调制 故障诊断
Abstract变频器供电侧电流比电机定子电流易于获取且较少受到噪声干扰。然而,由于基频频谱泄露的影响,基于变频器供电侧电流的电机电流信号特征分析方法无法诊断低负载或空载运行条件下的鼠笼电机转子断条故障。首先基于转移函数和调制理论建立了变频器供电侧电流谐波分析简化模型。在此基础上,提出了基于Hilbert 解调制的空载电机转子断条故障诊断方法。该方法的核心是采用Hilbert 变换提取电机稳态运行时的变频器供电侧电流信号包络线、构造基于包络线平方的解析信号并对该信号作FFT 频谱分析。在3 kW 电机实验台上对所提出的方法进行实验验证,实验结果表明了该方法的有效性。
Other AbstractIn comparison with stator current, supply-side current of invert-fed squirrel-cage induction motor is convenient to acquire and immune to noise. However, when a motor operates under light load or no-load conditions, the motor current signature analysis (MCSA) method based on supply-side current can not diagnose the broken rotor bar faults of inverter-fed squirrel-cage induction motor due to the spectrum leakage submerging other spectral response in its vicinity. In this paper, a simplified model of supply-side current harmonic signal for squirrel-cage induction motor is firstly established using the transfer function concept and frequency modulation theory. A diagnosis method of broken rotor bar faults of inverter-fed squirrel-cage induction motor at no-load based on Hilbert demodulation technique is proposed. The core of the method is to extract the envelope of the supply-side current signal under the motor steady operation condition using Hilbert transform, construct the analytic signal based on the square of the envelope and perform the FFT spectrum analysis of the signal. The experiment verification was performed on a 3 kW motor experiment test bench; the experiment results prove the effectiveness of the proposed method.
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Document Type期刊论文
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GB/T 7714
祝洪宇,胡静涛,高雷,等. 基于变频器供电侧电流Hilbert解调制方法的空载电机转子断条故障诊断[J]. 仪器仪表学报,2014,35(1):139-147.
APA 祝洪宇,胡静涛,高雷,&黄昊.(2014).基于变频器供电侧电流Hilbert解调制方法的空载电机转子断条故障诊断.仪器仪表学报,35(1),139-147.
MLA 祝洪宇,et al."基于变频器供电侧电流Hilbert解调制方法的空载电机转子断条故障诊断".仪器仪表学报 35.1(2014):139-147.
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