This research focuses on simulating a transformer

using electromagnetic field solver software: FEMM and COMSOL

Multiphysics®. These tools are used to simulate and extract

the model of a three-winding transformer. The primary objective

of the extracted model is to predict key magnetic parameters,

such as leakage and magnetizing inductances. These inductances

play a critical role in switch-mode power converter topologies,

ensuring proper operation and achieving high efficiency through

zero-voltage or zero-current switching. In this study, the transformer,

based on an ER28/14/11 core, is simulated using both

FEMM and COMSOL, with the resulting models compared

to each other and experimental measurements. FEMM is a

free, 2D solver, while COMSOL is a commercial, 3D solver.

This research aims to evaluate the feasibility of using the noncommercial

FEMM tool to simulate complex transformer core

shapes. Transformations of the E, ER, and ETD core types for

simulation in both 2D axis-symmetric and planar problem types

are also proposed.