By using the quasi 3D coupled current method presented, the influences of structure of
cold crucible, power frequency, electricity
property of charge(melt), coil(inductor)position and current on the
Electromagnetic Field(Emf) and the levitation characteristics in the melting processes are analyzed. It is shown that in the melting process, power frequency and crucible structure are the decisive factors for the ability of penetrating magnetic flux into
cold crucible. The magnetic flux density in cold crucible is reduced with the rising of power frequency, and this tendency becomes stronger when that is higher than 100 kHz. The segmented structure of cold crucible can reduce the induction eddy in itself effectively, and the higher the power frequency is, the better the result is. So, a cold crucible can be segmented into (16～20) sectors for higher frequency electromagnetic field( f >100 kHz),(8～12) sectors for high frequency one (10 kHz≤ f ≤100kHz), and (4～8) sectors for mid high frequency one ( f <10 kHz). It is also shown that the levitation force in melting charge is related to coil current as a parabolic function.