This study proposes a diagnosis method for open-circuit faults of six-phase permanent magnet synchronous motor. When the open-circuit fault occurs in the single-bridge arm or the double-bridge arm, wavelet transform extracts the trigger signal of fault, and the z ₁ – z ₂ plane current component is analysed. Seven kinds of fault modes are defined by analysing the characteristics of the scatter plot of the z ₁ – z ₂ plane current component. The fractal dimension of the z ₁ – z ₂ plane current component scatter plot is calculated to accurately quantify the fault modes. Moreover, 13 fault areas are defined by analysing the current centroid position of the z ₁ – z ₂ plane current component. First, the diagnosis of two particular kinds of fault modes is completed by selecting the fault area. Besides, the diagnosis of the remaining five kinds of fault modes is completed by combining the fault area and the fault mode. The conditions for judging all open-circuit faults are summarised to establish a fault database. All the open faults can be diagnosed by searching the fault database by the proposed method. Finally, the effectiveness of the method is verified by experiments.

中文翻译：

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六相永磁同步电动机驱动系统开路故障的诊断方法

本文提出了一种六相永磁同步电动机开路故障的诊断方法。当单桥臂或双桥臂发生开路故障时，小波变换提取故障触发信号，ž ₁ – ž 分析₂平面电流分量。通过分析散点图的特征定义了七种故障模式。ž ₁ – ž ₂平面电流分量。分形维数ž ₁ – ž _计算2个平面电流分量的散布图，以准确地量化故障模式。此外，通过分析当前的质心位置，定义了13个断层区域。ž ₁ – ž ₂平面电流分量。首先，通过选择故障区域来完成对两种特定类型故障模式的诊断。此外，通过结合故障区域和故障模式完成对剩余五种故障模式的诊断。总结判断所有开路故障的条件，以建立故障数据库。通过提出的方法搜索故障数据库，可以诊断出所有打开的故障。最后，通过实验验证了该方法的有效性。