用Simulink中的SimPowersystem完成一个转速、电流双闭环直流调速系统的设计与仿真。采用三相桥式整流，平波电抗器Lp的大小可根据根据仿真调整。给出电机在空载启动，以及在2.5S后加额定负载时转速、电流、电压的变化曲线，并结合调速理论分析这些曲线。-A rotational speed in Simulink SimPowersystem to complete the design and simulation of the current double closed loop DC drive system. Three-phase bridge rectifier and smoothing reactors Lp size can be according to the simulation to adjust. Given motor load starting, and 2.5S after the rated load, speed, current, voltage curve, combined with the speed control theoretical analysis of these curves.