ELECTROMAGNETIC CHARACTERISTICS OF LEVITATION MELTING WITH COLD CRUCIBLE
(College of Materials, Shanghai University, Shanghai200072, P. R. China)
Abstract: By using the numerical simulation method with quasi-three-dimensions and the modified coupled current model presented in the previous work, the influences of the structure of cold crucible, the power frequency and the electricity property of melting charge on the electromagnetic field in the levitation melting processes were analyzed. The fundamentals for the technique design of levitation melting with cold crucible were presented. It is shown that the levitation melting with cold crucible is a self-balanced and self-stable process, and the cold crucible can be segmented 16~20 sectors for high frequency electromagnetic field and/or 4~8 sectors for lower frequency one. It is also shown that the change of the power frequency has great influence on the magnetic flux density on the surface of metallic charge, but for nonmetallic charge, the main influence on the magnetic flux density is the segmented number of cold crucible.
Key words: cold crucible electromagnetic induction levitation melting numerical simulation