基于plc五層電梯控制系統(tǒng)

1、成都工業(yè)學(xué)院 成都工業(yè)學(xué)院畢 業(yè) 設(shè) 計 (論 文)專 業(yè) 自 動 化 班 級 09215 09215 學(xué)生姓名 學(xué)生姓名 梁進(jìn) 梁進(jìn) 學(xué) 號 25 25 課 題 基于 基于 PLC PLC 的五層電梯設(shè)計 的五層電梯設(shè)計 指導(dǎo)教師 指導(dǎo)教師 耿 玉 茹

2、 2012 2012 年 6 月 1 日AbstractAlong with the development of modern economy and city life, the elevator has become an essential walking tool for people in daily life, and the performance of elevators obviously

3、 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 efficien

4、cy 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 t

5、he 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 re

6、placed 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 precisi

7、on, 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 present

8、s the characteristics of the elevator system based on relay control and PLC control, specially formulates the defects exposed from relay control system and the advantages of PLC control system, introduce the frequency

9、control of elevators. Secondly, base on reading many domestic and international relative literatures. The development of elevator techniques and elevator devices is overviewed. And then, the relative knowledge of freq

10、uency-converter is introduced; the principle of PLC model election and design scheme of PLC control system are introduced as well. On the basis of these, the PLC software of elevator system is developed according to th

11、e working states demands of the elevator. An elevator system based on PLC control is designed through combining the characteristics of software development and the rules of PLC control. Key Key words: words: Elevator