Diagnosis on Broken Bar of Squirrel-cage Asynchronous Motor Based on MCSA

Operation of squirrel-cage asynchronous motor when broken bar occurs is studied.An effective detecting method is put forward to find out the fault even if it is very slight,so measures can be taken in time.MCSA adopts time-windowing and Fourier transform to analyze motor current signature frequency components.Besides,fault frequency band is subdivided locally to get stator current fault characteristic frequency component which can be used to diagnose rotor broken bar.The simulation result shows that it effectively eliminates the frequency leak and barrier phenomena,and detects fault component exactly.