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在直流电机伺服系统中，晶体管脉冲宽度调制（PWM）得到了最广泛的应用．给出了基于微机控制、用8253内部计数器直接实现直流力矩电机H型双极模式两路PWM输出的设计方法．具有分辨率高、延迟时间可变等优点．
In DC motor servo system, the transistor pulse width modulation (PWM) has been the most widely used. The design method of two-way PWM output of H-type bipolar mode for DC torque motor is given based on microcomputer control and 8253 internal counter. With high resolution, variable delay time and so on.