This paper explores the design and adjustment of the adjustable speed system of DDC using thyristor for D. C. motor and presents its hardware and software design and the test result in the first quadrant.

• 本文对直接数字控制(Direct Digital Control,简称DDC)可控硅直流电动机调速系统的设计与调试进行了探索,给出了系统硬、软件设计和第一象限的实验结果。