电磁振动给料机的变频控制研究

发布时间：2019-06-02 04:19

【摘要】：本课题主要研究了一种电磁振动给料机的新型励磁方式和控制方式。电磁振动给料机作为常用的给料设备，以其运行费用低、使用寿命长等诸多优势广泛应用于冶金、煤炭、化工、轻工和粮食等行业。目前电磁振动给料机是以晶闸管半波整流励磁为主要励磁方式，而大型给料机在该方式下，会出现诸如固有频率调节不便、振动效率不高、产生的谐波污染电网等问题。针对上述问题，本课题借助于变频技术，深入的研究了电磁振动给料机的三相整流变频励磁方式和变频控制方式。本文首先建立了电磁振动给料机的力学模型，在研究了大型电磁振动给料机的动力学参数和电磁参数的基础上，介绍了三相整流变频励磁过程和基于滞后相位角测量控制最佳激振频率的原理。本课题重点设计并完成了三相整流变频励磁的控制系统。在文中讨论了电磁铁线圈在直流电作用下电流陡增的问题，并专门设计了由方波产生电路，锁相倍频电路和脉宽触发电路组成的PWM信号产生电路。为了实现大功率输出，本文采用三相整流滤波为前级，大功率IGBT模块逆变为后级的IGBT励磁主电路。设计了包括过压保护，，过流保护，开机保护等保护电路，保证了IGBT励磁主电路的稳定运行。文中还设计了给料机振幅、线圈电流、滞后相位角、IGBT温度等各个参数的实时监测系统，包括信号采集的硬件电路和显示界面的软件编程。最后，在软硬件调试成功的基础上，对电磁振动给料机进行激振实验。通过实验验证了三相整流变频励磁和变频控制方法确实可行，并在提高工作效率，扩大频率范围，增强实时控制性等方面有显著的效果，实现了预期的目标。
[Abstract]:In this paper, a new excitation mode and control mode of electromagnetic vibration feeder are studied. As a commonly used feeding equipment, electromagnetic vibration feeder is widely used in metallurgy, coal, chemical industry, light industry, grain and other industries because of its low operating cost, long service life and many other advantages. At present, the electromagnetic vibration feeder takes thyristor half-wave rectifier excitation as the main excitation mode, but in this mode, the large feeder will have some problems, such as inconvenient adjustment of natural frequency, low vibration efficiency, harmonic pollution of power grid and so on. In order to solve the above problems, with the help of frequency conversion technology, the three-phase rectifier frequency conversion excitation mode and frequency conversion control mode of electromagnetic vibration feeder are deeply studied in this paper. In this paper, the mechanical model of electromagnetic vibration feeder is established, and the dynamic parameters and electromagnetic parameters of large electromagnetic vibration feeder are studied. The process of three-phase rectifier frequency conversion excitation and the principle of controlling the optimal excitation frequency based on lag phase angle measurement are introduced. In this paper, the control system of three-phase rectifier frequency conversion excitation is designed and completed. In this paper, the problem of sudden increase of current in electromagnet coil under DC action is discussed, and a PWM signal generation circuit composed of square wave generation circuit, phase-locked frequency doubling circuit and pulse width trigger circuit is specially designed. In order to realize the high power output, the three phase rectifier filter is used as the front stage, and the high power IGBT module is inversely transformed into the back stage IGBT excitation main circuit. The protection circuits, including overvoltage protection, over-current protection and boot protection, are designed to ensure the stable operation of the IGBT excitation main circuit. The real-time monitoring system of feeder amplitude, coil current, lag phase angle, IGBT temperature and other parameters is also designed, including the hardware circuit of signal acquisition and the software programming of display interface. Finally, on the basis of successful debugging of software and hardware, the excitation experiment of electromagnetic vibration feeder is carried out. The experimental results show that the three-phase rectifier frequency conversion excitation and frequency conversion control method is feasible, and has remarkable effect in improving working efficiency, expanding frequency range, enhancing real-time control and so on, and realizes the expected goal.
【学位授予单位】：沈阳理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH237.1;TM921.51

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