毕业设计（论文）-基于单片机的PWM直流调速系统设计精选.doc

基于单片机的PWM直流调速系统设计 摘 要 随着时代的进步和科技的发展，电机调速系统在工农业生产、交通运输以及日常生活中起着越来越重要的作用，因此，对电机调速的研究有着积极的意义.长期以来，直流电机被广泛应用于调速系统中，而且一直在调速领域占居主导地位直流电动机具有优良的起、制动性能，宜在广泛范围内平滑调速。在轧钢机、矿井卷机、挖掘机、金属切削机床、造纸机、高层电梯等领域中得到广泛应用AT89C52单片机为核心，以2A、1000r/minL298N为H桥驱动芯片实现速度、电流反馈双闭环。采用PID控制算法，调节PWM 占空比从而控制电机两端电压，以达到调速的目的。用4*3键盘输入有关控制信号及参数，可以实现电机的启制动、正反转、速度调节。并在4位LED上实时显示输入参数及动态转速。 关键词：单片机、直流电机、PWM、 PID Based on SCM PWM dc speed control system design Abstract With the progress of The Times and the development of science and technology, motor speed system in agricultural production, transportation and daily life plays a more and more important role in motor speed, therefore, the research has positive significance. For a long time, have been widely applied in dc motor control system, and has been inhabited areas in speed dominant. Based on SCM dc motor speed control system of high degree of standardization of hardware circuit, low cost, and the temperature drift. Device, The control software to logic and complex operation. The system has good stability and reliability. Dc motor with excellent, braking performance, and in a wide range smooth speed. In the mill, mine machine, excavator, metal cutting machine, paper machine, high-level elevator is widely used in the fields. The design is based on single chip microcomputer control system of dc motor control PWM, by AT89C52 singlechip system, and 1000r/min small double-a dc motor to control, L298N H bridge to drive chip realize speed, double loop current feedback. PID control algorithm, regulate and control PWM occupies emptiescompared to achieve both voltage motor speed. Use 4 * 3 keyboard input signal and the relevant control parameters, can realize the rev brake motor speed regulation, and positive negative. And in four LED on real-time display input parameters and dynamic speed. Keywords ： monolithic integrated circuits, a direct motor，PWM，PID 基于单片机的PWM直流调速系统设计 I 摘要 I Abstract II 第一章 绪论 1 1.1课题背景 1 1.2课题功能 1 第二章 系统硬件电路的设计 2 2.1?系统总体设计 2 2.1.1??系统总体设计框图 2