Influence of Design Variables on the Performance of Permanent Magnet Synchronous Motor with Demagnetization Fault

This chapter focuses on the study of the effects of design variables on the permanent magnet (PM) demagnetization of a permanent magnet synchronous motor (PMSM) using a two-dimensional (2D) finite element analysis (FEA) software package. The aim is to investigate the shape design of a permanent magnet considering the effect of the pole embrace and the magnet thickness on demagnetization by using finite element method (FEM). As a result, it is shown that pole embrace and magnet thickness are the most important geometrical dimensions of the PMSM in terms of demagnetization fault. The effects of demagnetization fault on the magnetic field distribution, the back electromotive force (EMF) induced, and the electromagnetic torque of PMSM are examined. Using the simulated model, a technical method, based on fast Fourier transform (FFT) analysis of induced voltage and electromagnetic torque, is exported to detect the demagnetization fault. Finally, the technique used and the obtained results show clearly the possibility of extracting signatures to detect and locate faults and verifying the effectiveness of the analysis results.