Signature-Current Analysis for Fault-Tolerant PMSM Drive Systems

This paper introduces a novel real-time algorithm designed to diagnose open-circuit faults in power converters driving permanent magnet synchronous motors (PMSMs). The proposed method offers a simple and efficient solution for fault detection and isolation (FDI), relying solely on real-time phase current measurements. Unlike conventional approaches, this technique can identify both single and multiple open-switch faults while maintaining robustness against false alarms during PMSM speed variations. Simulation results across varying irradiance levels confirm the effectiveness of the proposed Fault-Tolerant Control System (FTCS). The developed strategy enhances photovoltaic system reliability by reducing costs, shortening detection time, and ensuring service continuity. Notably, the method achieves a fault detection time that is 5ms faster than existing techniques cited in the literature. Experimental tests conducted on a PMSM validate the effectiveness of the FDI strategy, demonstrating its capability to accurately detect, classify, and locate open-phase faults in the motor drive system.