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.

中文翻译：

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电动汽车三冗余三相PMA-SynRM的故障运行分析

由于在故障条件下具有不间断的运行能力，容错性机器驱动器受到安全性至关重要的应用（例如电动汽车（EV））的青睐。了解机器驱动器的故障行为对于促进故障诊断，控制规则设计并避免进一步的损坏至关重要。在本文中，详细分析了三相冗余三相永磁同步磁阻电机（PMA-SynRM）的故障运行行为。通过分析磁通势（MMF）的分布来解释不同三相模块的互耦合机理。发现三相设置模块通过MMF偏移分量相互影响，从而在电机中引起二次谐波。dq 轴电流，电压和扭矩。研究了开路和短路故障操作行为。分析的正确性通过有限元（FE）仿真和不同故障模式下的实验测试得到验证。这表明机器驱动器需要先进的控制技术来增强故障后操作条件下的电流跟踪能力。