Coreless Magnetic Transformer Design Procedure

The calculation of resistance and inductance of magnetic components without a core is not a simple task. Since the magnetic field distribution is 2D/3D, the models that have to be applied should consider such field distribution. The use of analytical expressions may help to obtain a rough approximation of the inductance value. However, an accurate calculation of coupling and resistance requires a more accurate approach like FEA solvers. This paper describes a full procedure to design coreless magnetic components. The proposed procedure is based on the use of analytical expressions in order to select the appropriate number of turns and winding positioning, and the use of FEA solvers in order to calculate the whole component model, including AC resistance and coupling