A comprehensive fault analysis of a five-phase induction motor drive with an open phase

Multiphase machines offer a set of advantages compared to their three-phase counterparts, but maybe the most attractive one is the fault-tolerance capability when some phases are opened. Post-fault situation has been analyzed showing that the ripple-free operation is possible if the reference currents are modified to generate a smoothly rotating magnetomotive force (MMF). However, the modeling of the multiphase machine under asymmetrical conditions has been hardly studied. This work analyses the modeling of distributed-winding symmetrical five-phase machines under asymmetrical conditions showing that it is possible to maintain a symmetrical model under asymmetrical conditions if the transformation matrices are properly defined. A detailed analytical derivation and simulation results are provided to present a comprehensive framework for the study of multiphase machines under fault condition.