Generalized open-circuit fault detection and diagnosis algorithms for star-connected multiphase permanent magnet synchronous machine drives

Fault tolerance is of special interest in safety-critical transport applications, where uninterrupted electric drive operation is required. In particular, multiphase permanent magnet synchronous machine (PMSM) drives provide additional degrees of freedom that can be exploited to enhance fault tolerance. For the practical implementation of fault tolerant controllers, fast and reliable fault identification procedures must be developed. This work proposes a set of generalized open-circuit fault detection and diagnosis algorithms for star-connected m-phase PMSM drive systems with a single neutral point connection. These algorithms are then particularized for a 5-phase configuration and hybridized into a single algorithm. Experimental results in a star-connected 5-phase PMSM drive fed by a Silicon Carbide (SiC) based voltage source inverter are finally presented. The obtained results demonstrate the correctness and the high detection and diagnosis accuracy of the proposal.