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Abstract
Due to the uninterrupted operation capability in the fault conditions, fault-tolerant machine drives are being favored by the safety-critical applications, such as the electric vehicles (EVs). Understanding the machine drive fault behavior is of key importance to facilitate the fault diagnosis, control law design, and avoid further damage. In this article, the fault operation behavior of a triple-redundant three-phase permanent magnet-assisted synchronous reluctance machine (PMA-SynRM) is analyzed in detail. The mutual-coupling mechanism of different three-phase modules is explained by analyzing the magnetomotive force (MMF) distribution. It is found that the three-phase set module affects each other via an MMF offset component, causing second harmonics in the dq -axis currents, voltages, and torque. Both the open- and short-circuit fault operation behaviors are investigated. The correctness of the analysis is validated by finite element (FE) simulations and experimental tests in different fault modes. It indicates that the machine drive requires an advanced control technique to enhance the current tracking capability in postfault operation conditions.
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