Dependence of Titanium Sample Position Inside Coil on Axial Levitation Force

Levitation melting is method for heating conducting materials suspended at alternating magnetic field, main advantage of this approach is absence of melt contact with the crucible material, which is necessary to obtain ultra-pure materials. One of the task arising during the design of installations is the creation of an optimal combination of the levitating inductor configuration and the power supply parameter, which ensures a levitation of the sample. A titanium cylinder of m = 4 g is used as the object under consideration; a multilayer cylindrical coil with a reverse turn was taken as the inductor design. Two cases were considered with the frequency of the supply current f = 6 kHz and f = 60 kHz. To calculate forces generated by the coil, the finite element method was applied, the electromagnetic problem was solved in for different currents, the pushing force and relative object position dependence was defined.