A Single Method for Multiple IGBTs, Current-and Speed-Sensor Faults Diagnosis in Regenerative PMSM Drives

This paper proposes a single fault diagnostic method for regenerative permanent magnet synchronous machine drives with the ability to handle multiple insulated gate bipolar transistor faults, single current sensor fault, and rotor-position disconnection. The considered faults are discriminated, and the faulty device is correctly identified in each case. The robustness against false alarms is improved by using adaptive thresholds and normalized diagnostic variables. The proposed algorithm requires the information given by current sensors and the rotor position sensor that are already available from the drive system, without requiring a high computational burden. Simulation and experimental results are presented to validate the effectiveness of the considered algorithm for both motoring and regenerative operations.