FEM Analysis of Demagnetization Risk of Flux-Switching Machine Under Short Circuit Condition Considering Machine Temperature

In this paper, the demagnetization risk of a flux-switching machine for low-voltage automotive drives is analyzed considering the machine temperature. Both nominal operation with maximum current and fault cases are investigated. Single-phase and three-phase short circuits are considered as fault cases. It can be seen that even in nominal operation the magnets can be partially demagnetized. The machine geometry is therefore optimized in such a way that magnet demagnitization is avoided both in nominal operation and in the event of a fault.