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1 引言直流电动机非常适用于宽调速控制,很多变速传动都应用直流电动机。工业用的传动系统的电网容量较小,因此变流器产生的电流谐波会使线电压波形畸变。由于反电势负载常常造成电流不连续,上述问题对电动机控制的应用变得特别严重。通常速度控制系统采用模拟量与余弦波相交技术,以期变流器具有线性传递特性。由于控制电压波来
1 Introduction DC motor is very suitable for wide speed control, many variable speed drives are applied DC motor. Industrial drive systems have a small grid capacity, so current harmonics generated by the converter distort the line voltage waveform. The above problems have become particularly severe for motor control applications due to back-EMF loads that often cause discontinuities in the current. Usually speed control system uses the intersection of simulation and cosine wave technology, with the converter with linear transfer characteristics. Due to the control voltage wave