Detection of rotor bar corrosion in three phase asynchronous motors using wavelet analysis

In this paper a new method for the detection of rotor bar corrosion in squirrel-cage asynchronous motor is introduced. Because of costly machinery repair, extended process down time, and health and safety problems, it is very important to focus on fault detection strategies for industrial plant. Detection of cage motor broken rotor bars has long been an important but difficult job in the detection area of motor faults. It is known that about 9% of induction motor failures are caused by failure of the rotor faults. Rotor bar corrosion causes cracked rotor bars. Most recent efforts are focusing on current spectrum analysis for detecting rotor bar faults. This paper represents instantaneous power analysis to detect rotor bar corrosion.