A Normalized Frequency-Domain Energy Operator for Broken Rotor Bar Fault Diagnosis

In the motor current signal, characteristic frequency of broken rotor bar (BRB) fault is modulated by supply and it decreases with decrease load, resulting to be easily buried under light load conditions. Teager-Kaiser energy operator (TKEO) has shown better performance detect BRB faults than classical methods, such as envelope analysis spectral analysis. However, original definition TKEO leads its result lack physical meanings causal processing in can lead phase distortion nonideal filter characteristics. Therefore, this article proposes a normalized frequency-domain (FDEO) for diagnosis, which does not require calculates multiple differentiations domain equal accuracy one operation. Furthermore, FDEO removes influence followed extract features. The mathematical model induction (IM) healthy faulty condition studied article. Then, proposed approach experimentally validated seeded two operating various To verify effectiveness, results are compared TKEO, analysis, It was found that method provides slightly obvious features respect especially when IMs run conditions faults.