直流电机控制电路
摘要：
随着时代的发展，数字电子技术已经普及到我们生活，工作，科研，各个
领域，此文将介绍一种直流电机，详细阐述了用单片机输出口所给占空比的不同
实现电机的调速的设计方法；着重讨论 L298 用于电机驱动时特有的优势。直流
电机调速具有相当的实际意义。依据其调速的基本理论，本电路由模拟电源、控
制电路、显示电路、驱动电路四部分组成。准确说就是模拟电源提供各个芯片电
源、数码管、驱动 L298 所需电压；显示电路用于显示电动机转动时的速度大小
及正反转所表示的代码。与传统的电动机调速相比具有操作方便，以及其输出速
度大小采用数码显示的特点。文章中介绍了 Protel 99 发展及特点。直流电动机
的工作原理、基本组成环节，电路分析、特殊元器件简介，设计方案的提出，更
进一步说明了这类电机的好处。着重利用软件 Protel 绘制出电路原理图。讨论了
目前研究工作中存在的问题，并对其发展的方向进行了展望，给出了一些个人的
观点。
关键词：
单片机 AT89C51 ；驱动 L298；555 定时器；直流电机；
DC motor control circuits
Abstract：
Along with the development of the ages, the numerical electronics technique has already make
widely available to our life, work, research, each realm, this text will introduce a kind of DC
motor control circuits。 Elaborated with a microcontroller outputs are
different to the duty cycle of the motor speed control circuit design;
Focus on L298 for motor drive at the unique advantage，and DC Motor Speed
Control has considerable practical significance. According to its
governor's basic theory, the power supply circuit from analog control
circuits, display circuit, the driving circuit four components. Is that
accurate simulation of power supply for each chip, digital control, drives
L298 required voltage; Show circuit for the motor rotation speed and size
reversion expressed by the code. With the traditional motor speed compared
with convenient operation and the size of the output speed digital display
features. DC motor principle, the basic components, circuit analysis,
special briefings components, design program, is further illustrated by
the benefits of these motors. Protel software focused on the use of mapping
circuit schematics. Discussion of the current research work is the problem
and the direction of its development of the prospect, give some personal
views.
