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Eddy-current melting of ferromagnetic bodies

F. I. HANTILA1,* , M. MARICARU1, O. DROSU1, S. MARINESCU2

Affiliation

  1. Department of Electrical Engineering, Politehnica University of Bucharest, Spl. Independentei 313, Bucharest, 060042, Romania
  2. Research and Development Institute for Electrical Engineering, Spl. Unirii 313, Bucharest, 030138, Romania

Abstract

Applying the fixed point polarization method to the nonlinear eddy-current field, with the magnetization dependent on the magnetic flux density and on the temperature, allows the field computation for each harmonic separately. Since the fictitious permeability can be chosen to be everywhere within the free space, the matrices of the linear systems to be solved at each iteration remain unchanged even when the nonlinear B-H characteristic changes with the temperature and the integral equation of the eddy currents may be used. The inversion of the matrices corresponding to the harmonics is performed only once, before the beginning of the iterative process. The time discretization of the heat conduction – diffusion equation is done by Crank-Nicholson technique and, at each time step, the temperature is obtained by the finite element method. The thermal conductivity and the specific heat capacity depend by the temperature. For the solid-liquid transition, a fictive specific heat capacity is adopted. An illustrative example is presented..

Keywords

Eddy-current heating, Nonlinear periodic fields, Polarization fixed point method, Solid-liquid transition.

Submitted at: March 13, 2008
Accepted at: May 14, 2008

Citation

F. I. HANTILA, M. MARICARU, O. DROSU, S. MARINESCU, Eddy-current melting of ferromagnetic bodies, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 5, pp. 1208-1212 (2008)