Dynamic Modeling for Interturn Short Circuit Faults in Symmetrical Six-Phase FSCW-PMSMs With Unaligned Fault Coil

Comprehensive fault dynamic model is the basis of high-performance fault diagnosis and fault-tolerant control. This article proposes an interturn short circuit faults dynamic model considering the location of unaligned fault coil for symmetrical six-phase fractional slot concentrated-winding permanent magnet synchronous machines (FSCW-PMSMs). In FSCW-PMSMs, the coils in one phase winding are usually wound on two or more different stator teeth. Therefore, the axis of fault coil is not necessarily aligned with the axis of fault phase. Model parameters, such as inductances and back electromotive force in shorted turns change with the location of fault coils. The proposed model can be used to improve diagnosis strategies to detect more fault detail. Simulation and experimental results show that the proposed model has a high accuracy on the short circuit current.