Investigation of the Impact of magnet fault on the performance an‎d demagnetization conditions of permanent magnet motors

10/21/2026 12:00:00 AM

This paper investigates the effects of magnet-related faults on the performance degradation an‎d irreversible demagnetization characteristics of permanent magnet machines, with particular emphasis on permanent magnet flux-switching motors (PM-FSMs). Finite element analysis is employed to eva‎luate the impacts of reverse magnetization polarity, dimensional tolerances, an‎d partial demagnetization of permanent magnets. The results demonstrate that such faults significantly distort the magnetic flux distribution, reduce the back electromotive force, an‎d create conditions conducive to the demagnetization of neighboring magnets. Furthermore, a finite element–based magnetic analysis is conducted to model the progressive degradation of magnetic domain structures under elevated temperature conditions, enabling the identification of critical regions highly vulnerable to irreversible demagnetization. An adaptive magnetic equivalent circuit model is also developed to provide rapid an‎d accurate prediction of system behavior under various fault scenarios. The outcomes of this study establish a solid foundation for the development of intelligent fault diagnosis schemes, fault-tolerant design strategies, an‎d the optimization of permanent magnet topologies for high-reliability industrial applications.

خطاي مغناطيس‌زدايي , موتورهاي آهنرباي دائم

Demagnetization Fault , Permanent magnet motors

Marziyeh Moradi

Dr. Abolfazl Vahedi