Stator turn fault modelling for a triple redundant 3x3-phase PMA SynRM

Accurate stator turn fault (STF) modelling technique is of paramount importance to assess the machine fault behavior and develop fault detection and mitigation strategies for a fault tolerant machine drive system. In this paper, a STF model is proposed for a triple redundant 3x3-phase permanent magnet assisted synchronous reluctance machine (PMA SynRM). The effect of turn fault current is represented by equivalent inputs to a general flux linkage model for each 3-phase set. Subsequently, the flux linkage of the fault turns is derived according to the coil location and slot position of the fault. The complete model is obtained by combining the flux linkage model with the governing voltage equations. The effectiveness and flexibility of the proposed model have been validated by extensive finite element (FE) simulations and experimental tests in various operation conditions. It is demonstrated that the model can predict the machine behavior with and without the mitigation action in the form of terminal short circuit (TSC).