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基于PWM逆变器供电轴电流问题的交流电机耦合电容的计算与测量

, PP. 60-67

Keywords: 交流电动机,轴电流,共模模型,耦合电容

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Abstract:

PWM变频供电驱动系统中在交流电机定、转子寄生电容耦合作用下轴上感应电压,继而产生轴电流,可使轴承失效。电机内部耦合电容参数的准确计算和测量对预测轴电压和轴电流有重要作用。本文根据电机几何尺寸,给出了耦合电容的解析计算公式,分析了电机容量对耦合电容和轴电压分压比的影响。采用有限元法对异步电机进行多导体系统耦合电容分析计算,提出了定子绕组电磁散线建模方法,大大减小了定子绕组和定子机壳之间电容Cwf的计算误差;三维有限元计算结果表明绕组端部对定子绕组与转子之间电容Cwr有较大影响。最后介绍了一种适用于中小容量电机的耦合电容测量方法。

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