The automatic online detection of open-circuit faults for the switched reluctance motor with ring winding structure

Abstract

This paper proposes a fault detection algorithm addressing both common open-circuit faults and unique continuous current faults in three-phase full-bridge switches for SRM with ring winding structure. By employing a decoupling computation of three-phase winding currents, fault signatures independent of operational state variations are derived. Following fault detection, adaptive thresholds dynamically adjusted with motor operating conditions are implemented for current analysis, enabling precise identification of fault types and locations through advanced signal processing. The developed methodology achieves online automatic diagnosis of conventional open-circuit failures and SRM-specific continuous faults in the power conversion system. Experimental validation under varying speed and load conditions demonstrates the algorithm's rapid response, diagnostic accuracy, and robust performance consistency, confirming its effectiveness for real-time fault monitoring in SRM drive applications.