Bearing Fault Detection Method of Induction Motor Based on Coherence Analysis
Leping Bu · Electric Drive · 2008
According to the feature of both the vibration signals and the stator current when a fault in the bearing of induction motor,a method to diagnose the bearing faults of induction motors based on coherence analysis was presented.At first,the Park′s vector modulus signal of the three-phase current was calculated.Then coherence analysis method was used for analyzing the Park′s vector modulus signal and the vibration signals from the motor′s bearing,and a coherence spectrum was obtained.Finally,the experimental results demonstrate that the bearing′s fault information can be extracted effectively from the coherence spectrum figure,and that the detection method has well signal-to-noise and the precision of the faults recognition is improved.