摘要:为了提高直流调速系统的动态、静态性能，我们通常使用闭环控制系统（主要有单闭环、双闭环）。而在对调速指标要求不高的场合，采用单闭环即可。相比较于开环系统，闭环系统能自动检测，把输出信号的一部分送回到输入端，与输入信号相比较，把差值作为实际的输入信号，它能自动调节输入量，提高系统的稳定性。
在对调速系统性能有较高要求的领域下，我们常会使用直流电动机，由于直流电动机开环系统的稳定性不能够满足要求，但可利用转速单闭环提高稳态精度，而采用比例调节器的负反馈调速系统仍是有静差的，如果要消除系统静差，可采用积分调节器代替比例调节器。
本文将重点探讨单环有静差转速负反馈调速系统，画出仿真模型，利用MATLAB/SIMULINK工具箱，对控制系统的电气原理结构图进行调速系统的建模与仿真。
关键词：直流调速系统；单闭环；静差；MATLAB/SIMULINK
Abstract:In order to improve the DC speed control system dynamic and static performance, usually adopts closed-loop control system(mainly includes single closed loop, double closed loop).And in not high demand on the speed regulation index of occasions, the single closed loop can.The closed-loop system than the open loop system can automatically detect the part of the output signal back to input, compared with the input signal, the difference value as a practical input signal and input of can adjust and improve the stability of the system.
On the speed regulation system performance in higher demand for DC often used the field, but for DC open loop system stability not can meet the requirements of, can use speed closed-loop improve single steady precision, and the proportion of the regulator is still have negative feedback speed regulation system static poor, in order to eliminate system static poor, can use integral regulator instead of proportion regulator.
This artical will focus on the single ring static speed negative feedback regulation system, draw the simulation model using MATLAB/SIMULINK toolbox on the control system of the electrical principle diagram of control system modeling and simulation.
Keyword：DC speed control system;single closed-loop;offset;MATLAB/SIMULINK
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