PWM变频调速电动机端子上电流特性的研究

The Chatracteristics of Current Waveform Acting on the Terminal of PWM Inverter-fed Motor

研究了PWM变频调速电动机端子上的电流特性 ,测量了驱动系统中各连接点的电流波形 ,特别是由陡上升沿电压引起的高频尖峰电流分量的特性 ,同时也研究了电缆长度及滤波器对驱动系统中各连接点的电流波形的影响 ,从理论上分析和讨论了电动机绕组的电流特性与其电压分布特性的关系 。

The characteristics of current waveform acting on the terminal of PWM are investigated in this paper.The Measured results of current waveform on the motor and inverter terminals are presented respectively,specially the spike current produced by the fast front pulse voltage.The influences of the cable length and filter parameter on the current waveform of the linked terminals are studied.Finally the relationships of voltage distribution of motor winding on its terminal current are analyzed theoretically.Some measures for improving voltage distribution are described also.