Teager energy operator and its application in the study of induction motor rotor broken bars fault

摘要

Broken rotor bar is one of the main causes of induction motor fault. The method for detecting the existence of sideband frequency component in stator phase current when the rotor bars broken by motor current signature analysis (MCSA) technology has been widely used. However, there are obvious limitations with the incipient fault, the amplitude of fault signature frequency is much smaller than the amplitude of the fundamental, and there is no significant difference of frequency between them, so that it is hard to extract the fault signature frequency. Consequently, this paper utilizes Teager energy operator to process one phase current signal and acquires the fault feature component by removing the DC component, so that determines whether the rotor bars is broken or not, and this processing is based on a modulation signal of stator current with broken rotor bars. In addition, the validated results origin from sufficient simulations and experiments analysis indicate that this process has distinct superiorities on detecting broken rotor bars and lower the spending in hardware and software substantially, compared with other methods which need sampling various signals.