Analysis Of Electromagnetic Force And Its Functions In Varying Electromagnetic Field

With the broad application of electromagnetic field and magnetohydrodynamics theory in materials science, more and more diversified electromagnetic field are imposing in the preparation of materials to improve the quality of products. For instance, the electromagnetic casting technology, the application of electromagnetic technology in continuous casting of metals, is a representative application of electromagnetic field in materials machining. The electromagnetic force acted on the molten metal is the core of electromagnetic theory applied in materials machining. Therefore, the investigation of electromagnetic force modality and the resulted flow modality of molten metal becomes an important part of electromagnetic processing of materials. Based on Maxwell electromagnetic theory, the revolving electromagnetic fields in one-pair-of-pole and two-pairs-of-pole electromagnetic devices are analyzed by the theoretical analysis and numerical simulation. We investigate the influence of structure of electromagnetic field, current and its frequency on the distribution intensity of magnetic field in this dissertation. The main work are as following: (1) The theoretical analysis and numerical simulation of electromagnetic field and Lorenz force in molten metal under different input current in order to get the theoretical and numerical results. (2) Via the comparison of magnetic field and electromagnetic force between two kinds of electromagnetic field devices discovering that the effect of two-pairs-of-pole device is better than one-pair-of-pole device. So we should choose two-pairs-of-pole device in application of this kind of electromagnetic field. (3) The theoretical analysis and numerical simulation of temperature distribution in electromagnetic casting procedure. Result shows that the application of electromagnetic field could decrease the temperature grads in casting so the solidification could be finished in very short time and more to decrease the appearance of hole hollow inside the casting because the transmitting function. (4) The function effects of electromagnetic force acted on the structure of solidified metal and the surface modality of metal casting are remarkably distinct under different input conditions.