长距离带式输送机多电机驱动功率平衡的研究
发布时间:2018-08-30 16:39
【摘要】:长距离带式输送机广泛应用于电厂,采矿,码头等工矿企业,具有输送能力大,污染小,寿命长等特点;主要包括:钢芯输送带,交流电动机,减速机,盘式制动器,,液压拉紧,变频器,跑偏及撕裂保护装置等。为减少输送带启动和运行张力,该系统通常采用多个大功率交流电动机驱动,电动机布置在不同的地方,如:头部,尾部,中部等。由于钢芯输送带具有较大的粘弹性,在启动和运行阶段,系统会产生较大的张力波;张力波沿输送带传播过程引起输送带的振动,影响系统的启动的平稳性,运行安全性,严重时会导致频繁的停车事故。由于电动机,减速机等机电设备的特性差异,及围包角的差异会导致系统中各电动机功率分配不均衡;这些电动机的不均衡性会产生更严重的张力波动过程。因此,多个电动机的功率平衡问题对输送机的安全运行有着非常重要的理论意义和应用价值。 论文首先介绍了长距离带式输送机的组成部分及关键部件的数学模型,主要包括:张紧装置,电动机,变频器,及输送带。采用有限元方法分析了输送机带的动力学模型;为简化仿真的复杂度,考虑了变频器和电动机的等效模型。 然后基于功率分配的稳态模型,分析了功率不平衡的原因及现象;讨论了功率不平衡的动态过程特性。设计出了功率平衡控制策略,并给出了一个功率平衡控制器,讨论了该功率平衡控制器的结构和计算过程。 最后,基于仿真模型给出了仿真结果,仿真表明该功率平衡器解决了功率均衡分配的问题,并具有较好的动态特性。文章的最后还讨论了一个工程应用情况。 论文工作的主要创新点在于:设计了输送机系统的功率分配的稳态模型和动态模型,该模型不但可以定性的分析功率不平衡的原因,也可以动态的仿真功率分配过程中的动态特性。
[Abstract]:Long distance belt conveyors are widely used in power plants, mining, wharf and other industrial and mining enterprises, with large transportation capacity, small pollution, long life and so on, including: steel core conveyor belt, AC motor, reducer, disc brake, etc. Hydraulic tension, frequency converter, deviation and tear protection device. In order to reduce the starting and running tension of the conveyor belt, the system is usually driven by several high power AC motors, which are arranged in different places, such as head, tail, middle and so on. Because of the large viscoelasticity of the steel core conveyor belt, the system will produce larger tension wave in the starting and running stage, and the tension wave will cause the vibration of the conveyor belt in the process of spreading along the conveyor belt, which will affect the stability of the system starting and the running safety. Serious accidents can lead to frequent parking accidents. Because of the characteristic difference of electromechanical equipment such as motor, reducer, and the difference of circumference angle, the power distribution of each motor in the system will be unbalanced, and the unbalance of these motors will produce more serious tension fluctuation process. Therefore, the power balance of multiple motors is of great theoretical significance and practical value for the safe operation of conveyors. This paper first introduces the components of long distance belt conveyor and the mathematical model of the key parts, including: tensioning device, motor, frequency converter, and conveyor belt. The dynamic model of conveyor belt is analyzed by finite element method, and the equivalent model of frequency converter and motor is considered to simplify the complexity of simulation. Then, based on the steady-state model of power distribution, the causes and phenomena of power imbalance are analyzed, and the dynamic process characteristics of power imbalance are discussed. A power balance control strategy is designed and a power balance controller is given. The structure and calculation process of the power balance controller are discussed. Finally, the simulation results are given based on the simulation model. The simulation results show that the power balancer solves the problem of power equalization allocation and has better dynamic characteristics. Finally, an engineering application is discussed. The main innovation of this paper is that the steady model and dynamic model of power distribution of conveyer system are designed. This model can not only analyze the cause of power imbalance qualitatively. Dynamic characteristics of power allocation can also be simulated dynamically.
【学位授予单位】:合肥工业大学
【学位级别】:硕士
【学位授予年份】:2011
【分类号】:TH222
本文编号:2213654
[Abstract]:Long distance belt conveyors are widely used in power plants, mining, wharf and other industrial and mining enterprises, with large transportation capacity, small pollution, long life and so on, including: steel core conveyor belt, AC motor, reducer, disc brake, etc. Hydraulic tension, frequency converter, deviation and tear protection device. In order to reduce the starting and running tension of the conveyor belt, the system is usually driven by several high power AC motors, which are arranged in different places, such as head, tail, middle and so on. Because of the large viscoelasticity of the steel core conveyor belt, the system will produce larger tension wave in the starting and running stage, and the tension wave will cause the vibration of the conveyor belt in the process of spreading along the conveyor belt, which will affect the stability of the system starting and the running safety. Serious accidents can lead to frequent parking accidents. Because of the characteristic difference of electromechanical equipment such as motor, reducer, and the difference of circumference angle, the power distribution of each motor in the system will be unbalanced, and the unbalance of these motors will produce more serious tension fluctuation process. Therefore, the power balance of multiple motors is of great theoretical significance and practical value for the safe operation of conveyors. This paper first introduces the components of long distance belt conveyor and the mathematical model of the key parts, including: tensioning device, motor, frequency converter, and conveyor belt. The dynamic model of conveyor belt is analyzed by finite element method, and the equivalent model of frequency converter and motor is considered to simplify the complexity of simulation. Then, based on the steady-state model of power distribution, the causes and phenomena of power imbalance are analyzed, and the dynamic process characteristics of power imbalance are discussed. A power balance control strategy is designed and a power balance controller is given. The structure and calculation process of the power balance controller are discussed. Finally, the simulation results are given based on the simulation model. The simulation results show that the power balancer solves the problem of power equalization allocation and has better dynamic characteristics. Finally, an engineering application is discussed. The main innovation of this paper is that the steady model and dynamic model of power distribution of conveyer system are designed. This model can not only analyze the cause of power imbalance qualitatively. Dynamic characteristics of power allocation can also be simulated dynamically.
【学位授予单位】:合肥工业大学
【学位级别】:硕士
【学位授予年份】:2011
【分类号】:TH222
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