成都工业学院毕业设计报告纸成都工业学院毕业设计(论文) 专业自动化班级 09215 学生姓名梁进学号 25 课题基于 PLC 的五层电梯设计指导教师耿玉茹 2012 年6月1日成都工业学院毕业设计报告纸基于 PLC 的五层电梯控制系统的设计指导老师:耿玉茹摘要随着现代经济和城市生活的发展,电梯成为人们日常生活必不可少的代步工具,电梯性能的好坏对人们生活的影响越来越显著。传统继电器电梯控。为了保证电梯运行高效节能又安全可靠,必须改进电梯控制方式。根据顺序逻辑控制的需要发展起来的可编程控制器(PLC) ,它是专门为工业环境应用而设计的数字运算操作的电子装置。PLC 处理速度快,可靠性高,能够保证电梯正常、安全、可靠地运行。同时,由于电机交流变频调速技术的发展,电梯的拖动方式由直流调速逐渐过渡到了变频调速,不仅能满足乘客的舒适感和保证平稳的精度,还可以降低能耗,节约能源,减小运行费用。本文将基于 PLC 的变频调速方法应用到电梯系统中,并对此方法进行研究。首先,分别阐述了电梯继电器控制和 PLC 控制的特点,突出讲述继电器电梯控制系统暴露的缺点以及 PLC 电梯控制系统所具有的优点,并对电梯的变频调速控制进行了介绍。其次,在阅读了大量国内外相关文件资料的基础上,对电梯技术和电梯设备的发展进行了综述。然后,介绍了变频器类型以及参数设计的相关知识; 同时介绍了 PLC 选型原则以及 PLC 控制系统的设计思路; 在此基础上,根据电梯系统自身的工作状态要求, 进行电梯系统的 PLC 软件开发,通过软件开发的特点,结合 PLC 自身的控制规律,设计出可实现一定功能的 PLC 电梯控制系统。关键词:电梯、可编程控制器、变频调速、旋转编码器安徽建筑工业学院毕业设计报告纸 Abstract Along with the development of modern economy and city life, the elevator has e an essential walking tool for people in daily life, and the performance of elevators obviously influences people ’s lives. The traditional elevator system based on relay largely decreases the reliability and security since the mechanical and ic inertia of relay is big In order to ensure the efficiency and reliable securities, the control method of elevator must be changed. The programmable logic control ( PLC) , what develops based on sequence logical control, is digital operation electronic device specialized in the industrial application environment. PLC possesses fast process speed and high reliability. Therefore, PLC can be able to ensure the elevator run normally, securely and reliably. The drive method of elevators has replaced the DC velocity modulation with frequency control due to the development of AC frequency control of motors. The frequency control not only satisfies fort sense of passengers and ensures the stable precision, but also decreases the loss of power, saves resources and reduces expenses. The frequency control method based on PLC is applied to the elevator system and further researched. Firstly, the essay respectively presents the
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