Vibration monitoring of PM synchronous machine with partial demagnetization and inter-turn short circuit faults

Abstract

Monitoring permanent magnet synchronous machine (PMSM) faults including partial demagnetization, inter-turn short circuit is necessary for safety and reliable operation. This paper studies vibration acceleration to detect faults using both mode shape and vibration frequency information. For this purpose, Finite element analysis is used to calculate the radial force distribution applied on the stator teeth and mode shape of the PMSM. 2-dimensional Fast Fourier Transformation (FFT) is employed to extract the significant harmonic orders, which dominate the vibration. Simulation and experimental results indicate that featured low mode order and corresponding frequency component would appear under fault conditions. Simulation and experimental results are used to analyze the effectiveness of the proposed approach.