Özet:

The paper reports a research into the distribution of magnetic force function in the working zone of a newly-designed disk separator, intended to clean the finely-dispersed bulk substances, transported by a belt conveyor, from unwanted ferromagnetic impurities. It has been shown that it is expedient, in order to create the required magnetic field topology in the working volume of the separator and to improve its energy efficiency, to use permanent magnets. It has been substantiated that the main advantage of the proposed device on permanent magnets is a possibility to self-clean the surface of a non-magnetic rotating discharge disk. Solving the main tasks of this research has employed a finite-element method implemented in the programming environment COMSOL Multiphysics. We have investigated a magnetic force function that acts on multi-domain ferromagnetic particles. Given the complexity of the spatial geometry of power field distribution in the working zone of a disk magnetic separator, we have constructed a three-dimensional model of the magnetic system. The effect of the magnitude of an air gap and, accordingly, the effective length of sector-like permanent magnets on the distribution of power magnetic function in the working zone has been determined. It has been shown that changing the air gap alters both the force function distribution for the height of the working zone and the magnitude of the power action. Recommendations have been given on the use of magnetic systems with different gaps. It has been established that for the extraction of ferromagnetic inclusions the uniformity of the force function distribution in the direction of deploying a spiral of magnets is important. It has been proven that magnetic systems with small gaps should be used in separators without an unloading disk. In this case, the magnetic system can be installed in close proximity to the separated material while the surface of permanent magnets should be carried out manually in proportion to the accumulation of the extracted ferromagnetic inclusions on them. The result of our study is the established rational size for an air interpolar gap, which ensures the maximum magnitude of power action and, consequently, a more efficient operation of the magnetic separator Author Biographies Iryna Shvedchykova, Kyiv National University of Technologies and Design Nemyrovycha-Danchenka str., 2, Kyiv, Ukraine, 01011 Doctor of Technical Sciences, Professor Department of Energy Management and Applied Electronic Engineering

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