Demagnetization analysis of Axial Flux Permanent Magnet motor under three phase short circuit fault

Axial Flux Permanent Magnet (AFPM) motors are known as motors with high torque and power density. In these motors, the Permanent Magnets (PMs) are exposed to the armature reaction field produced by three phase short circuit fault which can demagnetized magnets. This phenomenon could affect the performance of the motor by reducing flux density. In this paper, the possibility of demagnetization occurrence in AFPM is investigated, and its effect on flux density has shown. The results show the possibility of three phase short circuit demagnetization which leads to average flux reduction of PMs. The EMF and average torque reduces consequently.