PLC及变频器控制的多电机驱动带式输送机的研究

发布时间：2018-03-26 14:56

本文选题：带式输送机　切入点：变频调速驱动　出处：《内蒙古科技大学》2014年硕士论文

【摘要】：随着社会的不断发展，社会对能源的需求逐渐增加，虽然中国是一个储煤大国，但是我们的煤炭开采量并不能满足社会的需求，所以一个矿井的开采量要随着社会需求的增加不断提升。而一个矿井要想提高产煤量，运输系统就必须提升，目前大型煤矿的运输系统基本都采用带式输送机，因这种装置运量大、成本低，且维护比较简单，所以倍受欢迎。在文中建立了带式输送机的动力学模型，分析了各种启动方案对带式输送机启动特性的影响，找出了带式输送机的最佳启动加速度曲线;分析了各个电机的驱动功率的理想分配和实际分配的问题，找出了调节功率平衡的方法。本文在对带式输送机的工作原理和特性分析与研究的基础上，对其驱动系统进行了深入地研究。目前大型带式输送机的驱动装置主要采用CST（Controlled Start Transmission可控传动技术）驱动系统，随着电力电子技术的不断发展，变频调速驱动系统将逐渐成为主流。本文首先对变频调速技术、PLC等理论知识进行简要阐述，然后依据带式输送机的特性设计了一套由变频器控制的三电机驱动系统。因带式输送机是一种典型的恒转矩负载，且控制要求较高，故选用西门子公司生产的SIMOVERT MV系列矢量控制方式变频器。利用MATLAB软件在矢量控制方式和SVPWM调制技术的基础上分别对其启动特性和三电机间的功率配比进行了仿真，三电机间的功率平衡本文采用了主-从控制方式，即设定其中一台电机为主电机，其他两台为辅机。在仿真实验的基础上，本文选定了一部带式输送机，依据带式输送机的驱动电机选取了6SE80-1AA01变频器，，并依据控制要求采用S7-300PLC进行控制。文中采用PROFIBUS通信协议实现了PLC与变频器间的联络，利用CP5611板将IPC接入PROFIBUS通信网络中，通过此网络将数据传输到上位机。实验结果表明，变频软启动系统能够实现大型带式输送机在启动过程中对驱动力输出变化的要求，延长了启动时间，大大降低了输送带内的启动张力。同时变频驱动系统的使用可降低输送带的强度进而减少设备投资成木，变频驱动还具有维护量少和节能的优点。
[Abstract]:With the continuous development of society, the demand for energy is gradually increasing. Although China is a big coal storage country, our coal mining capacity cannot meet the needs of the society. Therefore, the mining capacity of a mine must continue to increase with the increase of social demand. If a mine wants to increase its coal production, the transportation system must be upgraded. At present, the transportation systems of large coal mines are basically using belt conveyors. This device is popular because of its large capacity, low cost and simple maintenance. In this paper, the dynamic model of belt conveyor is established, and the influence of various starting schemes on the starting characteristics of belt conveyor is analyzed, and the optimum starting acceleration curve of belt conveyor is found out. This paper analyzes the problems of the ideal and practical distribution of the driving power of each motor, and finds out the method of regulating the power balance. In this paper, the working principle and characteristics of the belt conveyor are analyzed and studied. At present, the driving device of large belt conveyor mainly adopts CST(Controlled Start Transmission controllable transmission technology) drive system, with the development of power electronic technology, The drive system of frequency conversion speed regulation will gradually become the mainstream. Then, according to the characteristics of belt conveyor, a three-motor drive system controlled by frequency converter is designed. The belt conveyor is a typical constant torque load, and the control requirement is high. Therefore, the frequency converter of SIMOVERT MV series vector control mode produced by Siemens Company is selected. Based on vector control mode and SVPWM modulation technology, the start-up characteristics and power ratio of three motors are simulated by MATLAB software, respectively. The power balance between the three motors is based on the master-slave control mode, that is, one motor is set as the main motor and the other two are auxiliary machines. On the basis of the simulation experiment, a belt conveyor is selected in this paper. According to the driving motor of the belt conveyor, the 6SE80-1AA01 inverter is selected, and the S7-300PLC is used to control it according to the control requirements. In this paper, the communication between the PLC and the inverter is realized by PROFIBUS protocol, and the IPC is connected into the PROFIBUS communication network by using the CP5611 board. The data is transmitted to the upper computer through this network. The experimental results show that the variable frequency soft start system can meet the requirement of driving force output change in the starting process of large belt conveyor and prolong the start-up time. At the same time, the use of frequency conversion drive system can reduce the strength of conveyor belt and reduce the equipment investment into wood. Frequency conversion drive also has the advantages of less maintenance and energy saving.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH222

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