【摘要】 介绍一种步进电动机统组电流可调的斩波型驱动电路的工作原理和基本特点，并介绍电压和频率可以同步变化，有利于高低速运行的调频调压电源．阐述这种电路的实验结果，提供了实测的有关数据．更多还原

【Abstract】 For the use of stepping motors,a chopper drive circuit and a frequency and voltagemodulated power source are presented. By this circuit,adjustable winding current can be obtained. By this power source,the voltage and frequency can be changed synchronously to fitin with either high or low speed operation. The results from experiments conducted on thiscircuit and the relevant observed data are given.更多还原