1、 脉冲宽度调制系统(PWM) 工 学 部 工学一部 专 业 自动化 班 级 学 号 姓 名 指导教师 负责教师 I 摘摘 要要 直流电机是最常见的一种电机,在各领域中得到广泛应用。研究直流电机的控 制和测量方法,对提高控制精度和响应速度、节约能源等都具有重要意义。脉冲宽 度调制(PWM)是在控制电路输出周期不变的情况下,通过输入设定不同的占空比, 从而达到改变输出直流电压的目的。本文通过使用 PWM 技术,对 ADC0809 采集到的 电压进行模数转换,然后将转换成的数字量传送到 AT89S52 里,在通过周期不变的 前提下,调节占空比,将其调节的结果在三位数码管上显示出来,而这整个调节过 程
2、的原理可以运用到调节电机的供给电压上来,以达到对直流电机的无级调速的目 的。 关键词:PWM;直流电机;无级调速 II Abstract DC motors are the most common type of motor, in various fields has been widely used. Study of DC motor control and measurement method, to improve the control accuracy and response speed, energy conservation is important and so on.
3、Pulse width modulation (PWM) control circuit in the output of the cycle remain unchanged, by entering a different duty cycle settings, change the output so as to achieve the purpose of DC voltage. In this paper, through the use of PWM technology, collected ADC0809 ADC voltage, and then convert the d
4、igital transmission to the AT89S52, in the adoption of the premise of the same cycle to regulate the duty cycle, the results of its regulation in three bit digital tube display, which is the principle of the adjustment process can be used to adjust the electrical supply voltage table in order to achieve the stepless speed regulation of DC motor purposes. Keywords: PWM; DC Motor; Stepless speed regulation III 目目 录录 1 课题研究背景和意义 . 1 1.1 背景. 1 1.2 意义. 1 2 课题相关的国内外发展情况 . 3 2.1 PWM 技术的发展情