毕业设计_电梯的排队系统设计.docVIP

xxx学院本科毕业设计(论文) 电梯的排队系统设计 学生姓名： xxxx 学生学号： xxxxx 院(系)： xxxxx 年级专业： xxxxx 指导教师： xxxx 教授 助理指导教师： 二〇一三年六月  摘 要 随着现代经济和城市生活的快速发展，电梯逐渐成为了人们日常生活中必不可少的代步工具，电梯性能的优劣对人们生活的影响越来越明显。而传统的继电器电梯控制系统，因为继电器本身的机械以及电磁惯性大，极大地降低了电梯系统的安全性和可靠性。为了保证电梯运行时既能高效节能又能安全可靠，电梯控制的方式必须改进。因为顺序逻辑控制的需要而迅速发展起来的可编程控制器(PLC)，它是为了工业环境应用而专门设计的数字运算操作的一种电子装置。PLC具有处理速度快，可靠性高，能够保证电梯可靠、正常、安全地运行的优点。同时，随着电机交流变频调速技术的发展，电梯的驱动方式己由以前的直流调速逐渐过渡到变频调速，这样不仅满足了乘客的舒适感和保证电梯平稳的精度，还达到了降低能耗，节约能源，减小运行费用的作用。本文将基于PLC的变频调速方法应用到电梯系统中，在这个基础上设计电梯的排队系统。 关键词：可编程控制器；变频调速；电梯驱动  ABSTRACT Along with the development of modern economy and city life, the elevator has become a 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 electromagnetic 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 controller(PLC),which 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. In addition. 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 the comfort 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, queuing system design on the basis of elevator. Keywords：The programmable logic controller；Variable frequency control；The elevator drive  目