A Sensor Fault Isolation Scheme for Co-existence of PMSM Current Sensor and Non-sensor Imbalance Faults

This work proposes a sensor fault isolation scheme for co-existence of permanent magnet synchronous machine (PMSM) current sensor and non-sensor imbalance faults. The proposed method examines DC link battery current residuals to determine the location of machine current sensor and non-sensor imbalance faults. Power conservation evaluation, phase current signals estimation and sensor information recovery are performed in the proposed method to derive DC link battery current residuals which reflect different features of various fault scenarios for fault isolation. The proposed scheme is capable of isolating complicated fault scenario of a machine current sensor fault and a non-sensor imbalance fault co-existence, which is a challenging issue in PMSM and is not well addressed in existing literature. The effectiveness of the proposed scheme is confirmed by simulation results in MATLAB for a PMSM under both phase current sensor fault and non-sensor phase imbalance fault.