带式输送机变频调速驱动系统的研究

发布时间：2018-03-22 16:29

本文选题：变频调速驱动　切入点：软启动　出处：《南京理工大学》2012年硕士论文　论文类型：学位论文

【摘要】：当前带式输送机正朝着长跨度、大功率、高带速、高稳定性的方向发展,带式输送机的动态设计及启动稳定性研究已成为新的课题。采用合理的启动方式降低带式输送机的启动动载荷是提高启动稳定性的主要方法。本文在分析了带式输送机动态特性基础上研究一种基于电动机变频驱动的软启动装置。首先,文中建立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。然后结合一条带式输送机的具体要求,设计了一套变频软启动系统,包括变频启动系统主回路断路器、隔离变压器、ACS 1000变频器的选型、变频驱动系统控制单元的设计,变频驱动系统的调速系统设计,多电机功率平衡的实现等。最后,通过现场试验检验了变频驱动系统能否满足带式输送机在启动过程中对驱动力和速度变化、负载发生变化时对驱动滚筒输出转矩变化、在加速和减速阶段系统可靠性及长时间运行系统稳定性的要求。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本,变频驱动还具有维护量少和节能的优点。
[Abstract]:At present, belt conveyors are developing in the direction of long span, high power, high belt speed and high stability. The dynamic design of belt conveyor and the study of startup stability have become a new subject. It is the main method to improve the starting stability of belt conveyor to reduce the starting dynamic load by adopting reasonable starting mode. Based on the dynamic characteristics of conveyer, a soft starting device based on frequency conversion drive of motor is studied. Firstly, the dynamic model of belt conveyor is established, and the influence of various starting schemes on the starting characteristic 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 adjusting the power balance. Then, a set of frequency conversion soft start system is designed according to the specific requirements of a belt conveyor. It includes the main circuit breaker of the frequency conversion startup system, the selection of the 1000 frequency converter of the isolation transformer, the design of the control unit of the frequency conversion drive system, the design of the speed regulation system of the frequency conversion drive system, the realization of the power balance of the multi-motor, etc. Finally, Through the field test, it is verified whether the frequency conversion drive system can satisfy the change of driving force and speed in the starting process of belt conveyor, and the output torque of the driving drum when the load changes. Requirements for system reliability and long-term system stability at acceleration and deceleration stages. 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 cost of equipment investment. The frequency conversion drive also has the advantages of less maintenance and energy saving.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH222

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