文档介绍：中国地质大学长城学院
本科毕业设计
题目 PWM控制的直流电动机
调速系统的设计
系别信息工程系
专业电气工程及其自动化
PWM控制的直流电动机调速系统设计
摘要
直流电机具有良好的线性调速特性,简单的控制性能,启动转矩大,能在宽广的范围内平滑、经济地调速,转速控制容易,调速后效率很高。
转速是直流电机运行中的一个重要物理量,如何准确、快速测量出电机转速,并且实现对电机的调速在实际工作中具有非常大的使用价值。直流电机具有非常好的调速性能,目前,在一些对调速性能要求比较严格的场合中,主要使用的还是直流调速系统。
本设计是以单片机AT89C51和L298控制的直流电机PWM调速系统。利用AT89C51芯片进行低成本直流电动机控制系统的设计,能够简化系统构成、降低系统成本、增强系统性能、满足更多应用场合的需要。系统实现对电机的正转、反转、急停、加速、减速的控制,以及PWM的占空比在LED上的实时显示。
关键词:直流电机; 转速; AT89C51; L298; PWM调速
ABSTRACT
DC motor has a good startup performance and speed characteristics, it is characterized by starting torque, maximum torque, in a wide range of smooth, economical speed, speed, easy control, speed control after the high efficiency.
Speed is an important physical quantity in the operation of the DC motor, how to accurately and quickly measure the motor speed, and to achieve in practical work with a very large value in use of the motor speed control. DC motor has very good speed performance, in some occasions more stringent requirements on the speed performance, the main use of the DC speed control system.
This design is DC motor PWM speed control system which is based on single chip puter AT89C51 and L298 to control. Using AT89C51 chip to design the low-cost dc motor control system, which can simplify the system structure, reduce the system cost, enhance the system performance, meet the needs of more applications. System control the move forward, reverse, stop, acceleration and deceleration of the motor, and PWM duty ratio in real-time display on LED.
Keywords:DC Motor; Speed; AT89C51; L298; PMW Speed Automatic
目录
1绪论 1
1
1
2
2直流电动机调速的概述 4
4
5
5
3总体设计方案 7
7
7
8
4系统硬件设计 9
9
9
9
9
11
LED数码管显示 13
LED简介 13
LED数码管和单片机的连接 14
14
5系统的软件设计 16
16
17
17
19