The principle of main parameter of the with the change of source frequency were given on the base of analyzing the equivalent circuit of induction motor.
在感应电动机等效电路的基础上，分析了当电源频率发生改变时，等值电路中主要参数的变化规律。
The equivalent circuit for model parameter calculation is also given, so a calculation for complicated mechanism could be simplified to a electrical circuit calculation.
同时作出了模型参数计算的等效回路图，将复杂机械机构计算简化为电回路计算。
A new method for equivalent circuit parameter extraction of capacitor is proposed, and the characteristic of capacitor is discussed according to the extracted results.
提出了新的电容等效电路参数提取方法并对埋置电容进行了特性分析。
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