中文说明：
自己照着电机拖动的书上，用matlab仿真了电机转速闭环实验，电机具体参数可以参照电力拖动自动控制系统第五版P45页。
English Description：
According to the book of motor drive, the closed-loop experiment of motor speed is simulated with MATLAB. The specific parameters of motor can refer to P45 of the fifth edition of electric drive automatic control system.