Switch Fault Diagnosis for Switched Reluctance Motors Based on Current Double-Measurement

Abstract

Fault diagnosis of power switches is essential for enhancing the reliability of switched reluctance motor (SRM) systems. This article proposes a novel double-measurement-based switch fault diagnosis method for SRM drives based on double-measurement. This method uses double-measurement of current information, which does not require additional sensors or detection circuits. First, an analysis and measurement of phase current are conducted using the proposed double-measurement method. Then, the implementation principles of the fault diagnosis method are illustrated. In addition, the application analysis is provided in detail for SRMs with different control strategies and chopping modes. Furthermore, the phase current detection can be effectively performed under switch fault conditions. Finally, experiments using an 8/6 four-phase SRM are conducted to validate the effectiveness of the proposed fault diagnosis method.