利用最小二乘法辨识直流电机的参数，含有了一个simulink的直流电机模型和一个m文件，先运行模型得到数据，再利用m文件进行辨识-Least-squares method using the parameter identification of DC motor contains a simulink model and a DC motor m file, run the model to get the data, and then use the file identification m