Detection and isolation of open-switch and current sensor faults in PMSM drives, through stator current analysis

Fault detection and fault accommodation as well as fault tolerance are important issues in closed-loop controlled three-phase converters. For such systems, power semiconductors and sensors are the most affected components by the occurrence of failures. Therefore, fault diagnosis and remedial operating strategies involving such components are highly required. In this work we propose a new reliable approach which aims to diagnosis current sensors and power semiconductors open-circuit faults in a permanent magnet synchronous motors (PMSM) drives. The proposed FDI scheme uses only the measured currents, which makes it suitable for real time implementation. The performances of the proposed technique are analyzed through experiments.