A NONLINEAR COUPLED 3D-MODEL FOR MAGNETIC-FIELD AND ELECTRIC-CIRCUIT EQUATIONS

In this communication we propose a 3D numerical model in which the magnetic field and electric circuit equations in the absence of eddy currents are solved simultaneously. To consider the magnetic equations we use a magnetic vector potential formulation with the gauge condition (A.w = 0) which permits to reduce the number of unknowns. To take into account the magnetic and electric non-linearities, the Newton-Raphson algorithm has been used. Two applications have been considered an iron core coil fed by sinusoidal voltage through a diode and a current transformer. In the last example the results obtained from the simulation are compared with experimental ones.