PUBLICATIONS

 This thesis presents a fault diagnosis algorithm for common DC bus-fed open-end winding (OEW) interior permanent magnet synchronous motor (IPMSM) drives. Mathematical modeling and fault characteristic analysis of the system reveal an inherent circuit symmetry between the dual inverters, which creates a critical ambiguity in isolating a single faulty switch using conventional passive methods. The proposed strategy addresses this limitation by combining a fault detection method based on normalized variables with a fault localization technique using high-frequency unipolar pulse injection. This localization relies on the physical principles of current blocking and current amplification caused by an unintentional boost-converter-like bypass path, enabling precise diagnosis even in low-speed regions with insufficient fundamental back-electromotive force (back-EMF). Comprehensive simulations and experiments demonstrate the effectiveness of the algorithm, proving its suitability for stable system operation across a wide operating range.