CN108072812B - 一种开关磁阻电机绕组匝间短路故障诊断方法 - Google Patents
一种开关磁阻电机绕组匝间短路故障诊断方法 Download PDFInfo
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Abstract
本发明公开的一种开关磁阻电机绕组匝间短路故障诊断方法,通过检测开关磁阻电机的各相电流,计算出各相电流的直流分量幅值、基波分量幅值与二次谐波分量幅值,将两相邻相相电流直流分量幅值、基波分量幅值与二次谐波分量幅值乘积的比值作为故障特征量,来诊断开关磁阻电机定子绕组是否发生匝间短路故障。故障诊断可靠,能定量计算并辨别故障程度,实用性强,效果好,适用于多种相数的开关磁阻电机,具有良好的工程应用价值。
Description
技术领域
本发明涉及一种开关磁阻电机绕组匝间短路故障诊断方法,适用于各种相数开关磁阻电机绕组匝间短路故障的诊断。
背景技术
由于过热、腐蚀、老化等因素,开关磁阻电机定子绕绝缘性能会退化,并导致定子绕组匝间短路故障。快速准确的定子绕组匝间短路故障诊断可以有效遏制定子绕组的短路故障的扩展,减小定子绕组匝间短路故障引起的破坏。目前,针对开关磁阻电机定子绕组匝间短路的故障检测与诊断技术研究文献较少,而且多是基于定性的理论分析,无法通过定量的方式将故障识别出来,并无法识别绕组短路的程度,缺少有实用价值的故障诊断方法。开关磁阻电机自身严重的非线性特性和非正弦非直流供电方式,也给其定子绕组匝间短路故障诊断的研究带来了困扰,需要找到一种能定量诊断开关磁阻电机绕组匝间短路故障的方法。
发明内容
技术问题:本发明的目的是针对已有技术中存在问题,提供一种开关磁阻电机绕组匝间短路故障诊断方法。
技术方案:本发明一种开关磁阻电机绕组匝间短路故障诊断方法;
检测开关磁阻电机的相电流,由公式:
计算出两相邻相相电流直流分量幅值、基波分量幅值与二次谐波分量幅值乘积的比值λ。
式中,λ代表故障特征量,A0表示前一相绕组电流直流分量幅值,A1表示前一相绕组电流基波分量幅值,A2表示前一相绕组电流二次谐波分量幅值;B0表示当前相绕组电流直流分量幅值,B1表示当前相绕组电流基波分量幅值,B2表示当前相绕组电流二次谐波分量幅值。
将两相邻相相电流直流分量幅值、基波分量幅值与二次谐波分量幅值乘积的比值λ作为故障特征量,来诊断开关磁阻电机是否发生匝间短路故障;
当两相邻相相电流直流分量幅值、基波分量幅值与二次谐波分量幅值乘积的比值λ小于1.0属正常运行状态;
当两相邻相相电流直流分量幅值、基波分量幅值与二次谐波分量幅值乘积的比值λ大于1.0属开关磁阻电机发生匝间短路故障。
有益效果:本发明对多种相数的开关磁阻电机绕组匝间短路故障诊断适用。采用检测开关磁阻电机的相电流值,计算出各相电流的直流分量幅值、基波分量幅值与二次谐波分量幅值,将两相邻相相电流直流分量幅值、基波分量幅值与二次谐波分量幅值乘积的比值作为故障特征量,来诊断开关磁阻电机定子绕组是否有短路故障。故障诊断可靠,能定量计算并辨别故障程度,实用性强,效果好,适用于多种相数的开关磁阻电机,具有良好的工程应用价值。
附图说明
图1是本发明应用于三相开关磁阻电机0.2N·m负载下定子绕组匝间短路故障特征量λ的值。
图2是本发明应用于三相开关磁阻电机0.4N·m负载下定子绕组匝间短路故障特征量λ的值。
图3是本发明应用于四相开关磁阻电机0.2N·m负载下定子绕组匝间短路故障特征量λ的值。
图4是本发明应用于四相开关磁阻电机0.4N·m负载下定子绕组匝间短路故障特征量λ的值。
具体实施方式
下面结合附图对本发明的实施例作进一步的描述:
开关磁阻电机绕组匝间短路故障诊断方法:
实施例一、以三相开关磁阻电机为例,检测开关磁阻电机功率变换器的三相电流值,由公式:
计算出两相邻相相电流直流分量幅值、基波分量幅值与二次谐波分量幅值乘积的比值λ。
式中,λ代表故障特征量,A0表示前一相绕组电流直流分量幅值,A1表示前一相绕组电流基波分量幅值,A2表示前一相绕组电流二次谐波分量幅值;B0表示当前相绕组电流直流分量幅值,B1表示当前相绕组电流基波分量幅值,B2表示当前相绕组电流二次谐波分量幅值。
将两相邻相相电流直流分量幅值、基波分量幅值与二次谐波分量幅值乘积的比值λ作为故障特征量,来诊断开关磁阻电机是否发生匝间短路故障;
如图1和图2所示,当两相邻相相电流直流分量幅值、基波分量幅值与二次谐波分量幅值乘积的比值λ小于1.0属正常运行状态;
当两相邻相相电流直流分量幅值、基波分量幅值与二次谐波分量幅值乘积的比值λ大于1.0属开关磁阻电机发生匝间短路故障。
实施例二、以四相开关磁阻电机为例,检测开关磁阻电机功率变换器的四相电流值,由公式:
计算出两相邻相相电流直流分量幅值、基波分量幅值与二次谐波分量幅值乘积的比值λ。
式中,λ代表故障特征量,A0表示前一相绕组电流直流分量幅值,A1表示前一相绕组电流基波分量幅值,A2表示前一相绕组电流二次谐波分量幅值;B0表示当前相绕组电流直流分量幅值,B1表示当前相绕组电流基波分量幅值,B2表示当前相绕组电流二次谐波分量幅值。
将两相邻相相电流直流分量幅值、基波分量幅值与二次谐波分量幅值乘积的比值λ作为故障特征量,来诊断开关磁阻电机是否发生匝间短路故障;
如图3和图4所示,当两相邻相相电流直流分量幅值、基波分量幅值与二次谐波分量幅值乘积的比值λ小于1.0属正常运行状态;
当两相邻相相电流直流分量幅值、基波分量幅值与二次谐波分量幅值乘积的比值λ大于1.0属开关磁阻电机发生匝间短路故障。
Claims (1)
1.一种开关磁阻电机绕组匝间短路故障诊断方法,其特征在于:检测开关磁阻电机的相电流,由公式:
计算出两相邻相相电流直流分量幅值、基波分量幅值与二次谐波分量幅值乘积的比值λ,式中,λ代表故障特征量,A0表示前一相绕组电流直流分量幅值,A1表示前一相绕组电流基波分量幅值,A2表示前一相绕组电流二次谐波分量幅值;B0表示当前相绕组电流直流分量幅值,B1表示当前相绕组电流基波分量幅值,B2表示当前相绕组电流二次谐波分量幅值;
将两相邻相相电流直流分量幅值、基波分量幅值与二次谐波分量幅值乘积的比值λ作为故障特征量,来诊断开关磁阻电机是否发生匝间短路故障;
当两相邻相相电流直流分量幅值、基波分量幅值与二次谐波分量幅值乘积的比值λ小于1.0属正常运行状态;
当两相邻相相电流直流分量幅值、基波分量幅值与二次谐波分量幅值乘积的比值λ大于1.0属开关磁阻电机发生匝间短路故障。
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