基于PLC的电梯自动控制系统设计_毕业设计论文.docVIP

海 南 大 学 毕 业 论 文（设计） 题 目：电梯自动控制系统的设计 学 院：机 电 工 程 学 院 系 别：电 气 工 程 系 专 业：电气工程及其自动化 完成日期：2013年 5 月10日 摘 要 随着经济的发展，现代城市中的高层建筑日益增多，电梯成为人们日常生活必不可少的工具。而电梯性能的好坏，除了电机等硬件以外，电梯控制系统是其核心因素。目前电梯控制系统主要有三种控制方式：继电器控制系统、PLC控制系统、微机控制系统。继电器控制系统由于故障率高、可靠性差、控制方式不灵活以及消耗功率大等缺点，目前已逐渐被淘汰。微机控制系统虽在智能控制方面有较强的功能，但也存在抗扰性差、系统设计复杂，一般维修人员难以掌握其维修技术等缺陷。实践表明可编程序控制器对电梯进行控制优于传统的继电器控制，其性能有很大改善。， 关键词: 可编程序控制器；电梯自动控制；仿真 Abstract Along with the economic development, increasing number of high-rise buildings in the modern city, elevators become an indispensable tool of daily living. And lift performance for better or worse, in addition to hardware such as motor, the elevator control system is its core elements. At present there are mainly three kinds of control methods of the elevator control system: relays, PLC control system the control system, computer controlled systems. Relay control system because of the high failure rate inflexibility, poor reliability, control methods, as well as disadvantages, such as power consumption, is now gradually being phased out. Microcomputer control system for intelligent control with strong features, but there is also poor immunity, complex system design, technical defects such as general staff it is difficult to control their maintenance. Practice shows that the programmable logic controller of the elevator control than traditional relay control, its performance has improved substantially. Therefore, this design using programmable controller to realize the automatic control of five-story elevator. Content of the paper included the elevator development and introduction to programmable logic controllers, system hardware and software design, programming and simulation of control system. Results show that the programme is practical. Keywords: Programmable controller; elevators control; simulation 目 录 1.引言 1 2.电梯技术简介 1 2.1.电梯的定义及发展历程 1 2.2.电梯的分类 2 2.3.电梯技术的研究现状及发展趋势 4 3. PLC的基本概念 5 3.1. PLC的由来 6 3.2. PLC的定义 6 3.3. PLC的特点 6 3.4. PLC的结构及工作原理 8 3.4.1. PLC结构 8 3.