相关性消去法诊断变频电源笼型电机转子断条故障  

Diagnosis of broken rotor bar fault in squirrel-cage motor fed with variable frequency power based on correlation filtering method

作　　者：安国庆[1,2] 刘教民[1,3] 刘玉坤[3] 梁永春[2] 

机构地区：[1]河北工业大学电气工程学院,天津300130 [2]河北科技大学电气信息学院,河北石家庄050054 [3]河北科技大学信息科学与工程学院,河北石家庄050054

出　　处：《电机与控制学报》2012年第3期47-52,共6页Electric Machines and Control

基　　金：河北省自然科学基金(f2006000101)

摘　　要：由变频电源驱动的鼠笼电机转子故障时,在变频器输入端的电流频谱中会出现以载波频率为中心,按某特定频率间隔分布其左右的故障边频。指出该故障特征容易被附近的频率分量湮没,且当低频或轻载运行时,故障特征的提取变得更加困难。针对这一问题,提出根据变频器输入、输出以及载波频率构造参考信号,利用相关性消去法滤除湮没故障特征的频率分量,使变频电源供电的转子故障特征在频谱图上凸显。实验结果表明:方法具有较强的故障辨识能力,在变频器低频或轻载的场合同样适用。系统只需采样单相电流信号和变频器的输入输出频率信号,方法简单,易于工程实现。When broken rotor bar fault occurs in squirrel-cage motor with variable frequency power,the fault characteristic which takes the carrier frequency as the centre,is distributed in the input-side current spectrum of inverter with specific frequency interval.But it is easy to be covered with neighbouring components,and the condition gets worse as the inverter runs in low frequency or under light load.To solve this problem,the reference signals were constructed according to input,output and carrier frequency of inverter.With the correlation filtering method,the components confusing the diagnosis result was removed,and the fault characteristic can emerge from the spectrum.Experiment results indicate that this method has a powerful fault distinguishing ability,even in the case of low frequency or light load.Furthermore,only single phase current and inverter frequency sampling are needed,so it is easy for engineering realzation with low expense.

关 键 词：鼠笼型电机 故障诊断 相关性消去法 转子断条故障 变频器 

分 类 号：TM343[电气工程—电机]