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Design and analysis of a linear type electromagnetic stirrer

Electromagnetic stirring (EMS) of metallic alloys is mainly used to refine the grain structure of castings. This technique results in increased homogeneity of the cast alloys. In this paper a design oriented approach to a linear electromagnetic stirrer is presented. A mathematical model of such a stirrer is proposed to obtain electromagnetic field solutions. The field solutions so obtained are compared with those obtained from the finite-element model. The influences of excitation frequency and current on the induced current density and axial force and their variation with radius have been investigated. Experimental results obtained from a prototype are presented.