说明：  给出了直流电机双闭环调速系统在Matlab/simulink 下的仿真程序，是电气工程及其自动化专业毕业设计中 所能用到得MATLAB仿真。
(Gives the two-loop DC motor speed control system in Matlab/simulink simulation under the procedures, graduate electrical engineering and automation design can be used in MATLAB simulation.)