Diagnosis of Open-Phase Faults for a Five-Phase PMSM Fed by a Closed-Loop Vector-Controlled Drive Based on Magnetic Field Pendulous Oscillation Technique

An online diagnostic approach of open-phase faults for a five-phase permanent magnet synchronous motor (PMSM) fed by closed-loop vector-controlled drive is presented in this article. This accomplished based on the magnetic field pendulous oscillation (MFPO) phenomenon, which significant “swing-like” observed case faults. According to an analysis signatures MFPO patterns under faulty conditions, all possible are detected, including single-phase open faults, two-adjacent phase and two-nonadjacent Moreover, capable localizing faulted phase/phases further extracting angle features angular position waveforms conditions. Meanwhile, order minimize number sensors reduce implementation cost approach, phase-locked loop technique developed overcome fault masking difficulties associated with compensation action drive. As result, only requires four current speed sensor, typically already available PMSM systems control purposes. Finally, experimental results demonstrate effectiveness approach.