采煤机截割部电机变频动态特性分析

发布时间：2018-05-19 16:39

本文选题：采煤机 + 截割电机　；参考：《辽宁工程技术大学》2015年硕士论文

【摘要】：煤炭资源从始至终都是我国基础能源的中流砥柱,现代化以及机械化综采环节中采煤机作为重要设备之一从早期的液压牵引、链牵引进一步发展到当今先进的电牵引、无链牵引,而电牵引技术由结构繁琐可靠性差的直流牵引到具有结构简单、工作可靠、隔爆性能好等诸多优点的交流牵引的快速发展,使本文关于采煤机截割电机变频动态特性研究与分析的工程实践意义非常具有必要性。采煤机交流电机的关键技术难度之一为截割部驱动电机的变频调速系统,本文将变频过程主要分为整流和逆变两个部分,选取MG750/1910-WD型采煤机为样机将整流部分采用电压空间矢量控制进行分析,逆变部分则通过更为先进新颖的直接转矩控制方案。由于采煤机截割部负载特性作为对截割电机变频动态特性分析研究的基础,首先建立适于变频系统的截割动力学模型,并由此提出了截割负载的简化模型,使得下面的研究工作得以简单方便。之后对于截割电机建立了数学模型并据此描述出采煤机截割电机变频机械特性,针对截割电机交流变频的特点分析了其恒功率控制的动态特性。而后详细研究变频系统中整流器及逆变器的基本原理,基于ASD800型变频器,对PWM整流部分使用MATLAB/Simulink模型库进行建模仿真,分析研究了截割电机整流过程的变频动态特性。最后在逆变部分依据直接转矩控制理论并依据其圆形磁链轨迹控制建立了加权磁链观测模型,同样通过Simulink的建模仿真截割电机变频系统,通过仿真结果分析了磁链、电流、转速与转矩的影响,得出采煤机截割电机变频的动态特性并完整的全面系统的分析,可作为采煤机的研发以及工矿实践的参考依据。
[Abstract]:Coal resources are the mainstay of basic energy in our country from beginning to end. As one of the important equipments in modern and mechanized fully mechanized coal mining, shearer has further developed from early hydraulic traction and chain traction to modern advanced electric traction. There is no chain traction, and the electric traction technology develops rapidly from DC traction with complicated structure and low reliability to AC traction, which has many advantages such as simple structure, reliable work, good flameproof performance, etc. It is necessary to study and analyze the frequency conversion dynamic characteristics of shearer cutting motor in this paper. One of the key technical difficulties of AC motor of shearer is the frequency conversion speed regulation system driven by cutting part. In this paper, the frequency conversion process is mainly divided into two parts: rectifier and inverter. The rectifier part is analyzed by voltage space vector control and the inverter part is analyzed by a more advanced direct torque control scheme. Because the load characteristic of cutting part of shearer is the foundation of analyzing the frequency conversion dynamic characteristic of cutting motor, the cutting dynamic model suitable for frequency conversion system is established, and the simplified cutting load model is put forward. So that the following research work can be simple and convenient. Then the mathematical model of cutting motor is established and the frequency conversion mechanical characteristics of cutting motor of coal cutting machine are described. The dynamic characteristics of constant power control are analyzed according to the characteristics of AC frequency conversion of cutting motor. Then the basic principle of the rectifier and inverter in the frequency conversion system is studied in detail. Based on the ASD800 converter, the MATLAB/Simulink model library is used to model and simulate the rectifier part of the PWM, and the dynamic characteristics of the frequency conversion in the rectifying process of the cutting motor are analyzed and studied. Finally, based on the direct torque control theory and the circular flux locus control, the weighted flux observation model is established in the inverter part. The frequency conversion system of the cutting motor is simulated by Simulink, and the flux and current are analyzed by the simulation results. Under the influence of rotational speed and torque, the dynamic characteristics of frequency conversion of cutting motor of shearer and the comprehensive and systematic analysis are obtained, which can be used as a reference for the research and development of shearer and the practice of industry and mining.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD632.1

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