零序电流及改进峰值能量法在电机滚动轴承故障诊断中的应用  

Application of Zero Sequence Current and Improved Peak Energy Method on Fault Diagnosis of Motor Rolling Bearing

作　　者：李继伟 马浩 尚朋飞 Li Jiwei;Ma Hao;Shang Pengfei(CRRC Yongji Motor Co.,Ltd.,Yuncheng 044502,China;Shanxi Key Laboratory of Traction Motor for Rail Transit,Yuncheng 044502,China)

机构地区：[1]中车永济电机有限公司,山西运城044502 [2]轨道交通牵引电机山西省重点实验室,山西运城044502

出　　处：《煤矿机械》2024年第4期173-175,共3页Coal Mine Machinery

基　　金：适用于复杂环境下的大功率风力发电机关键技术研究及产品研制“科学家+工程师”队伍(2023KXJ-041)。

摘　　要：基于滚动轴承故障引起的零序电流变化的机理,提出一种采用小波变换及改进峰值能量法的牵引电机轴承故障诊断方法,并进行了案例验证。首先,通过park变换获得零序电流信号;其次,采用小波变换及峰值能量法对零序电流信号分解并平方整流;最后,对整流信号进行包络及傅里叶分析,提取其中的轴承故障特征频率,实现轴承的故障诊断。案例结果表明,该方法能够有效地提取轴承故障特征频率,实现对电机轴承的故障诊断。Based on the change of zero sequence current caused by rolling bearing faults,a fault diagnosis method for traction motor bearing by using wavelet transform and improved peak energy method was proposed and verified by a case.Firstly,the zero sequence current is obtained through park transformation.Secondly,wavelet transform and peak energy method are used for square rectification.Finally,the envelope and Fourier analysis of the rectification signal are carried out,and the bearing fault characteristic frequency in the signal is extracted to achieve bearing fault diagnosis.The case results show that this method can effectively extract the bearing fault characteristic frequency and achieve fault diagnosis for motor bearing.

关 键 词：滚动轴承 零序电流 小波变换 峰值能量 故障诊断 

分 类 号：TH133.33[机械工程—机械制造及自动化]