5、act DC speed control system is the main form of the automatic speed regulation system,it has a good starting and brake performance,can be in a wider range of speed regulation of smooth realized in speed,fast dynamic response process,and low speed running
6、torque these excellent performance and control characteristic,but for a long time,DC speed control system has been occupies an important position. From a market perspective,DC speed control system in theory and practice are more mature, from the point of v
7、iew of the control technology,it is the foundation of ac speed adjustment system. So in dc speed control system in electric transmission won the widely used. This article from the working principle of dc machines,a PWM double closed loop reversible dc spee
8、d control system,and the mathematical model of detailed analysis of system principle and the static and dynamic performance. In the theory analysis and simulation research,and on the basis of design a set of
