Effects of Design Variables on Demagnetization Fault in Permanent Magnet Synchronous Motor

This paper studies 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. 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 effect of demagnetization fault on the magnetic field distribution, the back-electromotive force (EMF) induced and the electromagnetic torque of PMSM are examined.