| The electromagnetic drive of metal melt is one of the key technologies ofelectromagnetic processing of materials. Electromagnetic force can be used as external forcein the metal melt inside to effectively control and drive the flow of the liquid metal.Magnetic drive technology is widely used in material preparation and metal melttransportation and so on now. According to the different form of electromagnetic driving inmetal melt, the magnetic field can be divided into rotating magnetic field, linear magneticfield and spiral magnetic field. Among them, the rotating magnetic field and linear magneticfield is the most widely used. At present, the research on numerical simulation ofelectromagnetic drive mostly focus on the influence of the external electric field on drive,such as the impact of the structure and the position of drive is less mentioned.This paper is based on the theory of electromagnetic drive, making numericalsimulation for the electromagnetic drive technology. Electromagnetic stirring and thetechnology of electromagnetic pump is the typical process which make use of rotational andlinear magnetic field driving metal melt Through numerical simulation of two kinds ofmagnetic field driving liquid metal, comparing periodical change of magnetic inductionintensity and induced current, to analyze the effect mechanism of rotating and linearmagnetic field driving metal melt, and the reasons causing different motion form.Make use of rotating magnetic field driving metal melt, the transient magnetic fieldin the horizontale plane rotated periodically, and change period is consistent with theexternal electric current. Through calculation and analysis, we found that:the metalconductors between drive and liquid metal has a strong shielding effect on magneticfield, can produce end effect.so we through the relative position changes of the driving coiland mold lower port to study the influence of shielding effect. It turned out that the size and direction of magnetic field had signficant changes in the horizontal liquid steel surfacewhen the dyive position moved down, electromagnetic force and magnetic field increasedsignificantly and will produce the vertical force component. The horizontal component wassymmetrical distributed on both sides of the center. It was the mponent force made the liquidsteel rotated along the horizontal plane.Linear magnetic field moved along linear direction and formed a closed magneticcircuit, through changing the load parameters and drive structure to study the influencefactors of electromagnetic force.increasing the current and coil number of turns canobviously increase the electromagnetic force. If current frequency is too big, theelectromagnetic force will decrease. In this paper, the electromagnetic force is the largestwhen current is40A and frequency is20Hz.Throuh reducing the space between inside andoutside the core, improving the core material’s magnetic conductivity can increaseelectromagnetic force effectively, after enlarging the pole area from0.02m~2to0.03m~2, theaverage electromagnetic force increased,and transient electromagnetic force’s volatilityin the whole cycle decreased, which is conducive to improve the transmission stability ofliquid metal.Through calculation and analysis to further master the characteristics of low-frequencymagnetic field driving metal melt, the conclusion and rule will provide theoretical support toexpand and improve the application of magnetic drive technology in actual production. |
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