基于相位差的轴向磁通无铁心电机早期轻微匝间短路故障诊断

针对轴向磁通定子无铁心电机早期匝间短路故障问题，提出一种基于零序分量和定子电流分量相位差的轴向磁通定子无铁心电机的早期匝间短路故障诊断和定位方法。首先，根据定子绕组电感极小的特点建立了匝间短路故障数学模型；其次，对故障前后的短路电流、相电流、零序分量等进行了傅里叶分析，通过零序电压基波幅值变化对匝间短路故障进行识别；最后，通过对比零序电压基波与定子三相电流初相位差来进行故障相定位。结果表明，匝间短路故障相的相电流基波初始相位与零序电压基波初相位差的绝对值近似180°，而健康相的相位差与180°相差较大。基于相位差可以实现轴向磁通无铁心电机早期匝间短路故障的诊断与定位，为永磁电机的匝间短路故障诊断提供了参考。

Early slight inter-turn short circuit fault diagnosis of axial flux stator coreless permanent magnet motor based on phase difference

Aiming at the problem of early inter-turn short circuit fault of axial flux stator coreless motor, a method for early inter-turn short circuit fault diagnosis and positioning of axial flux stator coreless motor based on the phase difference of zero sequence component and stator current component was proposed. Firstly, according to the characteristics of extremely small stator winding inductance, a mathematical model of inter-turn short circuit fault was established. Secondly, Fourier analysis of the short-circuit current, phase current and zero-sequence component before and after the fault was carried out, and the inter-turn short-circuit fault was identified by the change of the amplitude of the zero-sequence voltage fundamental wave.Finally, the fault phase was located by comparing the initial phase difference between the zero-sequence voltage fundamental wave and the stator three-phase current. The results show that the absolute value of the difference between initial phase of the phase current fundamental wave and the initial phase of the zero sequence voltage fundamental wave of the inter-turn short-circuit fault phase is approximately 180°, while the phase difference of the healthy phase is quite different from 180°. Based on the phase difference, the diagnosis and positioning of the early inter-turn short circuit fault of axial flux ironless motor can be realized, which provides some reference for the diagnosis of inter-turn short circuit fault of permanent magnet motor.