Simulation research of fault model of detecting rotor dynamic eccentricity in brushless DC motor based on motor current signature analysis

The dynamic eccentricity fault model was implemented and the inductance and flux were resolved based on the finite element method (FEA) on Ansoft/Maxwell. That the simplified fault frequency of monitoring induction motor dynamic eccentricity could be used on brushless DC motor (BLDC) was demonstrated by simulation. The system of brushless DC motor was simulated on Ansoft/Simplorer. In steady state, the Fast Fourier Transform (FFT) analysis was used on the stator current. The simulated model of detecting dynamic eccentricity based on the stator current signature analysis (MCSA) method was investigated and implemented: The frequency to indentify dynamic eccentricity fault, the amplitude of frequency to estimate the dynamic eccentricity severity. Furthermore, the effect of speed pulsation of BLDC operating under steady state was investigated in this article. The results indicate that the severity of dynamic eccentricity fault increase, the amplitude of fault frequency increase.