Treetrong Juggrapong, Sinha Jyoti K, Gu Fengshu, Ball Andrew
School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester, UK.
ISA Trans. 2009 Jul;48(3):378-82. doi: 10.1016/j.isatra.2009.03.002. Epub 2009 Apr 23.
A number of research studies has shown that faults in a stator or rotor generally show sideband frequencies around the mains frequency (50 Hz) and at higher harmonics in the spectrum of the Motor Current Signature Analysis (MCSA). However in the present experimental studies such observations have not been seen, but any fault either in the stator or the rotor may distort the sinusoidal response of the motor RPM and the mains frequency so the MCSA response may contain a number of harmonics of the motor RPM and the mains frequency. Hence the use of a higher order spectrum (HOS), namely the bispectrum of the MCSA has been proposed here because it relates both amplitude and phase of number of the harmonics in a signal. It has been observed that it not only detects early faults but also indicates the severity of the fault to some extent.
多项研究表明，定子或转子中的故障通常会在电机电流特征分析（MCSA）频谱中的市电频率（50Hz）附近以及更高谐波处显示边带频率。然而，在目前的实验研究中并未观察到此类现象，但定子或转子中的任何故障都可能使电机转速和市电频率的正弦响应失真，因此MCSA响应可能包含电机转速和市电频率的多个谐波。因此，本文提出使用高阶谱（HOS），即MCSA的双谱，因为它涉及信号中多个谐波的幅度和相位。据观察，它不仅能检测早期故障，还能在一定程度上指示故障的严重程度。
Zotero 插件