【摘要】：本課題主要研究了一種電磁振動給料機的新型勵磁方式和控制方式。電磁振動給料機作為常用的給料設備，以其運行費用低、使用壽命長等諸多優(yōu)勢廣泛應用于冶金、煤炭、化工、輕工和糧食等行業(yè)。目前電磁振動給料機是以晶閘管半波整流勵磁為主要勵磁方式，而大型給料機在該方式下，會出現(xiàn)諸如固有頻率調(diào)節(jié)不便、振動效率不高、產(chǎn)生的諧波污染電網(wǎng)等問題。針對上述問題，本課題借助于變頻技術(shù)，深入的研究了電磁振動給料機的三相整流變頻勵磁方式和變頻控制方式。 本文首先建立了電磁振動給料機的力學模型，在研究了大型電磁振動給料機的動力學參數(shù)和電磁參數(shù)的基礎(chǔ)上，介紹了三相整流變頻勵磁過程和基于滯后相位角測量控制最佳激振頻率的原理。 本課題重點設計并完成了三相整流變頻勵磁的控制系統(tǒng)。在文中討論了電磁鐵線圈在直流電作用下電流陡增的問題，并專門設計了由方波產(chǎn)生電路，鎖相倍頻電路和脈寬觸發(fā)電路組成的PWM信號產(chǎn)生電路。為了實現(xiàn)大功率輸出，本文采用三相整流濾波為前級，大功率IGBT模塊逆變?yōu)楹蠹壍腎GBT勵磁主電路。設計了包括過壓保護，，過流保護，開機保護等保護電路，保證了IGBT勵磁主電路的穩(wěn)定運行。文中還設計了給料機振幅、線圈電流、滯后相位角、IGBT溫度等各個參數(shù)的實時監(jiān)測系統(tǒng)，包括信號采集的硬件電路和顯示界面的軟件編程。 最后，在軟硬件調(diào)試成功的基礎(chǔ)上，對電磁振動給料機進行激振實驗。通過實驗驗證了三相整流變頻勵磁和變頻控制方法確實可行，并在提高工作效率，擴大頻率范圍，增強實時控制性等方面有顯著的效果，實現(xiàn)了預期的目標。
[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.
【學位授予單位】：沈陽理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TH237.1;TM921.51

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