Fault Tolerant Control for a Five-Phase Permanent Magnet Synchronous Machine Driving System

In this paper, an open-circuit fault tolerant strategy for a five-phase permanent magnet synchronous machine ( PMSM) is proposed based on the theory of keeping the magneto-motive force constant under both healthy and faulty conditions. According to the principle, the corresponding modified current vectors of healthy windings under three different open-circuit faults are derived, respectively. Then, Both the finite element analysis-based predictions for the five-phase PMSM machine and Matlab/Simulink-based simulation for the whole driving system verify the effectiveness of the fault tolerant strategies under each open-circuit fault. Finally, a 5kW five-phase PMSM prototyped machine is manufactured and a DSP-based driving system is set up to verify the strategies.