Apart from the passive fault-tolerant control strategies, any active fault-tolerant strategy requires a timely fault diagnosis signal to trigger the control reconfiguration under asymmetric condition. This article proposes a fault diagnosis method where the inherent relationship between fundamental and third harmonic stationary reference currents is established by declaring two new groups of current-based variables. Then two distinct fault characteristics of current performance in the transient conversion from healthy to faulty operation are derived. Based on the fault characteristics, a fast, robust and easy-implemented diagnosis algorithm is proposed based on currents in stationary reference frame to address the multiple open-switch fault diagnosis in five-phase permanent magnet machines. In order to verify the effectiveness of the proposed algorithm, a series of experiments have been conducted and the results indicate the strong robustness even under load variation and the valid diagnosis to each type of faults are performed. Moreover, the proposed method possesses favorable generality and can be extended to other multiphase machines.

中文翻译：

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利用固定参考系中电流对五相永磁电机进行多次开路故障诊断

除了被动容错控制策略外，任何主动容错策略都需要及时的故障诊断信号来触发非对称条件下的控制重新配置。本文提出了一种故障诊断方法，其中通过声明两组新的基于电流的变量来建立基波和三次谐波固定参考电流之间的固有关系。然后推导了从正常运行到故障运行的瞬态转换中电流性能的两个明显故障特征。基于故障特征，提出了一种基于平稳参考系中电流的快速，鲁棒，易于实现的诊断算法，以解决五相永磁电机的多次开路故障诊断。为了验证所提算法的有效性，进行了一系列实验，结果表明即使在负载变化的情况下也具有很强的鲁棒性，并且可以对每种类型的故障进行有效的诊断。此外，所提出的方法具有良好的通用性，并且可以扩展到其他多相电机。