变频电机绕组内部暂态过电压分布特性

Study of Distribution Characteristics of Transient Overvoltage in Windings of Variable Frequency Motor

通过搭建电机三相电路模型并对电机绕组内部暂态电压分布进行分析,得出三相绕组间的相互作用可有效抑制各相对地电压分布幅值;匝对地电容对匝间分布有很大影响,随着首匝对地电容增加,匝间最大电压呈线性分布;其余各匝对地电容同时改变时,匝间电压则呈幂函数形式增加;绕组每匝电感对匝间最大电压分布呈幂函数形式增加,对每支线圈对地电压影响不明显.

By building the three-phase circuit model of the motor and analyzing the transient voltage distribution inside the motor winding,it is concluded that the interaction between the three-phase windings can effectively suppress the amplitude of the phase to ground voltage distribution.The first turn to ground capacitance has a great influence on the turn to ground distribution,and the maximum voltage between turns presents a linear distribution with the increase of the first turn to ground capacitance.When the other turns to ground capacitance changes at the same time,the turn to turn voltage also changes.The results show that the voltage increases in the form of power function,the inductance per turn of winding increases in the form of power function to the maximum voltage distribution between the turns without obvious effect on the ground voltage of each coil.