Comparative investigation of stator-mounted permanent magnet machines under fault conditions

Abstract

Here, machines having permanent magnets (PM) mounted in the stator are compared during fault operations such as armature winding short circuits. The magnet potential irreversible demagnetisation is also investigated due to the fact that the PMs are placed close to the armature coils (heat sources) and hence are prone to temperature-related demagnetisations. It is found that the doubly salient and flux reversal machines have inherently higher fault tolerant capabilities when compared with the switched-flux one. To the point of view of demagnetisation withstand capability, the doubly salient topology stands out as the most robust one while the switched flux is the weakest one.

Keywords

• permanent magnets
• magnetic flux
• permanent magnet machines
• finite element analysis
• demagnetisation
• stators
• fault tolerance
• permanent magnet motors
• machine windings
• inherently higher fault tolerant capabilities
• switched-flux
• doubly salient topology
• switched flux
• comparative investigation
• stator-mounted permanent magnet machines
• fault conditions
• permanent magnets
• fault operations
• short circuits
• magnet potential irreversible demagnetisation
• armature coils
• heat sources
• temperature-related demagnetisations
• doubly salient reversal machines
• flux reversal machines