simulink直流电机转速电流双闭环控制模型。(Double Closed Loop Control Model of DC Motor.)

结合电力电子技术，在不同占空比的情况下调节不同的电压，实现对直流电机的开环调速控制(Combined with power electronics, different duty cycle in the regulation of different voltage, to achieve the DC motor open-loop speed control)