PWM电机控制系统设计与仿真学院：专业：姓名：学号：指导老师：职称：中国·珠海二O一九年三月摘要直流电机是一种兼具良好启动性能和广阔调速特性的电机，可实现频繁的无级快速启动、反转和制动，不仅能在宽广的范围内平滑，经济地调速，而且过载能力强，能承受频繁的冲击负载。因而在电力机车、无轨电车、轧钢机、机床和启动设备等必须经常启动并调速的电气传动装置中得到了普遍的运用。然而随着科技的进步，在生产生活中对于电机控制精度的要求也越来越高，传统调速方法已经满足不了现代控制的需求，于是产生了PW控制电机调速的方法。本文主要研究了利用PWM信号控制电机运动的方法，设计并仿真了PWM直流电机调速系统。应用C语言编写程序，利用STC89C52单片机改变PWM信号的占空比改变电机两端的电压，从而实现对电机启动、制动、反转的控制。用霍尔元件测速系统测出电机的转速，通过LCD显示屏显示出来，更直观的体现电机的转速也方便对电机进行调速。关键词：直流电机：PWM调速：STC89C52:设计：仿真2DC motor control system design and simulationAbstractDC motor has good start-up performance and wide smooth speed regulationcharacteristics.It can realize frequent stepless fast start-up,reversal and braking.Itcan speed smoothly and economically in a wide range.It has strong overload capacityand can withstand frequent impact loads.Therefore,it has been widely used inelectric drive devices which need to start and adjust speed frequently,such as electriclocomotives,trolleybus,rolling mills,machine tools and starting equipment.However,with the progress of science and technology,the requirement of motor controlaccuracy in production and life is also getting higher and higher.The traditional speedcontrol method can not meet the demand,so the PWM control method of motor speedregulation is produced.This paper mainly studies the method of using PWM signal to control motormotion,and designs and simulates the speed control system of PWM DC motor.Theprogram is written in C language,and the duty cycle of PWM signal is changed bySTC89C52 single chip computer to change the voltage at both ends of the motor,soas to realize the control of starting,braking and inversion of the motor.The speed ofthe motor is measured by Hall element speed measuring system,which is displayedby LCD display screen.It is more intuitive to show the speed of the motor,and it isconvenient to adjust the speed of the motor.Keywords DC motor;;the PWM speed control STC89C52;design;simulation3