1、 基于 PLC 的三相异步电动机正反转控制 摘 要 本论文设计了三相异步电动机的 PLC 控制电路，就是三相异步电动的正反转 控制，与传统的继电器相比，具有控制速度快，可靠性高，灵活性强等优点。非 常实用。三相异步电动机的应用广泛，具有结构简单，效率高，控制方便，运行 可靠，易于维修成本低的优点，几乎涵盖了工农业生产和人类生活的个个领域， 在这些领域中，三相异步电动机运行的环境不同，所以造成其故障的发生也很频 繁，所以要正确合理的利用它。本文研究的这个系统是采用 PLC 的编程语言 梯形图，梯形语言是在可编程控制器中的应用最广的语言，因为他在继电器的 基础上加进了许多功能，使用灵活的指令，是逻
2、辑关系清晰直观，编程容易，可 读性强，所示的功能也大大超过传统的继电器控制电路，可编程控制器是一种数 字运算操作的电子系统，他是专为在恶劣工业环境下应用而设计，它采用可编程 序的存储器，用来在内部存储执行逻辑运算，顺序控制，定时，计数和算术等操 作的指令，并采用数字式，模拟式的输入和输出，控制各种的机械或生产过程。 关键词：PLC ， 三相异步电动机 ，可编程控制 ，梯形图 PLC CONTROL WITH A THREE WIRE ASYNCHRONOUS MOTOR IS INVERTING DESIGN ABSTRACT The programmable controller (PLC)
3、 is a microprocessor as the core, will automatic control technology, computer technology and communication technology be in harmony is an organic whole and of the development of new industrial automatic control device. Current PLC has basically has replaced traditional relay control and are widely u
4、sed in industrial control each domain, and the traditional relay control, compared with PLC control circuit has control of speed, reliability, high flexibility, etc., and very practical. Production machinery to often ask moving parts can realize both the positive and negative direction starting, thi
5、s will request the drag electric function as positive and reverse rotation. By motor principle, it is known that change motor three-phase power phase sequence, can change motor steering. This paper studies the system control is the use of PLC programming language - ladder, ladder language is in the
6、programmable controller in the most widely used language, because it is in the relay is added on the basis of the many functions, the use of flexible instruction, so that the logic relationship of a clear and intuitive, easy programming, readability is strong, the realization of the functions it considerably exceeds the traditional relay control circuit. KEY WORDS:PLC, three-phase asynchronous motor ,ladder language 目 录 前 言1 第1章 三相异步电动机基础2 1
