基于PLC的矿井提升机变频调速系统设计.doc

基于PLC的矿井提升机变频
调速系统设计
摘要
矿井提升机是矿山最重要的设备,肩负着矿石、物料、人员等的运输责任。传统的矿井提升机控制系统主要采用继电器-接触器进行控制,这类提升机通常在电动机转子回路中串接附加电阻进行启动和调速。这种控制系统存在可靠性差、操作复杂、故障率高、电能浪费大、效率低等缺点。针对这种情况采用PLC与变频器相结合的控制方案对原有电控系统进行改造,提高整个电控系统安全可靠性、控制精度及调速性能。因此,对矿井提升机控制系统进行研究具有现实意义,也是国内外相关行业专家学者的一个研究课题。
本文针对提升机控制系统中存在的上述问题,把可编程序控制器和变频器应用于提升机控制系统上,并在可行性方面进行了较深入的研究。事实表明,采用该控制系统,使提升机工作可靠,使用方便,同时具有动态显示的功能,节能效果明显。
关键词:矿用提升机;变频调速;矢量控制;可编程控制器
Title The Freouency Conversion Use on The Speed Adjustment of Shaft Hoist on The Basis of PLC Control
Abstract
The shaft hoist is the foremost equipment of mines,it is widely used to transport the materials,staff and traditional shaft hoist control system is always controlled by the relay-contactor,and adopts the methods of connect series additional resistant in rotors winding loop to start and adjust speed. The system has many disadvanges such as bad plicated operation,high fault rate,large energy –wasting and low efficiency. According to this kind of condition, we adopt PLC and Transducer to reform for original control system, so as to raise the safety, reliability, control precision and speed regulation performance of the whole electric controlled system. So,carrying on the research on the shaft hoist control system has realistic meanings,and it is a subject for research by relevant experts and scholars,both at home and abroad.
To these questions existing in the shaft hoist contro1 system,the paper applied PLC(Programmable Logic Controller)and frequency converter to the system,and carried on deeper research in feasibility. The fact indicates,adopting control system,the shaft hoist works reliably,easy to use,energy-saving well,and have dynamical shown function.
Keywords:Shaft hoist;Frequency conversion;Vector control;PLC
目次
1 绪论 1
课题概述 1
国内外矿井提升机的发展状况 1
本文内容及研究的意义 5
2 矿井提升机调速控制系统的设计 8
矿井提升机对电气控制系统的要求 8
提升机调速控制系统方案设计 10
3 PLC在提升机变频控制系统中的应用 17
PLC概述 17
本系统中PLC的选型及特点 17
PLC控制系统设计 18
4 变频调速系统 23
变频调速的发展及在提升机系统