Simplified analysis of circuits containing ferromagnetic cores without air‐gaps

The evaluation of currents in circuits with ferromagnetic cores leads to troublesome graphical or numerical procedures. These difficulties may be overcome by the introduction of a simple analytical approximation of the magnetization curve directly into the inductance of a circuit. In this way one can clearly describe currents in electric circuits and magnetic induction in a toroidal core (without an air‐gap), including magnetization due to eddy currents and some other effects not considered in the commercial PSpice program.