基于PWM的可逆直流调速系统的仿真研究_毕业设计论文.doc

PAGE 4 广西工学院鹿山学院 毕业设计（论文） 题 目：基于PWM的可逆直流调速 的仿真研究 系 别： 电子信息与控制工程系 二〇一三年 五 月 十一 日 摘要 直流调速系统具有调速范围广、精度高、动态性能好和易于控制等优点，同时它具有良好的起、制动性能，可以在较宽的调速范围内实现平滑调速，较快的零动态响应过程，并且低速运转时力矩大这些极好的运行性能和控制特性，长期以来，直流调速系统一直占据着重要地位，所以在电气传动中获得了广泛应用。以电力电子学和电机调速技术为基础，本文设计了一种基于直流脉宽调制（PWM）控制技术的可逆直流电机调速系统。为了得到较好的动静态性能，该控制系统采用了双闭环控制，同时速度调节器和电流调节器都选用PI调节器。在本文中，对直流电机转速、电流双闭环调速系统进行了研究，建立了PWM双闭环可逆直流调速系统的数学模型，详细分析了系统的原理及其静态和动态性能，并对一种基于脉宽调制(PWM)装置的双闭环调速系统进行了转速、电流调节器的工程设计。在理论分析和仿真研究的基础上，对双闭环调速系统的设计参数进行分析和计算，利用MATLAB/Simulink对系统进行了各种参数给定下的仿真，给出仿真波形并得出结论。 关键词：PWM控制；直流电动机；双闭环系统 ；PI调节器； MATLAB仿真 Abstract DC speed-regulating system has the following advantages,wide speed range, higher accuracy,better dynamic properties,easy to control,and so on. it has a good starting and brake performance,can be in a wider range of speed regulation of smooth realized in speed,fast dynamic response process,and low speed running torque these excellent performance and control characteristic,but for a long time,DC speed control system has been occupies an important position. On the basis of Power Electronic and electric motor speed adjusting technology, the calibrator designs a speed adjusting system in which Pulse Width Modulation (PWM) controlling technology is used to control reversible DC motor. The control system uses a double closed – loop control, speed regulator and current regulator using PI regulator at the same time, in order to get good static and dynamic performance.In this paper,the DC motor speed and the current double closed-loop speed control system are studied,a PWM double closed loop reversible DC speed control system,and the mathematical model of detailed analysis of system principle and the static and dynamic performance, and a kind of double closed loop speed control system S regulator based on PWM device is designed. In the theory analysis and simulation research,double closed loop speed regulation system,the design parameters of analysis and calculation,the use