Modeling of Losses and Current Density Distribution in Conductors of a Large Air Gap Transformer Using Homogenization and 3D FEM

摘要

A large air gap transformer has a strongly inductive behavior and leakage flux is very important. In some cases, in order to improve the coupling coefficient of a large air gap transformer, it is interesting to have a low turn number and a large winding window. As a result, coils are composed of a large number of conductors in parallel and variation of flux in winding window is important. Therefore, losses and current density distribution are not uniform. This paper presents a study of current density distribution and losses in conductors of a large air gap transformer composed of two E cores using homogenization and 3D FEM. Moreover, solutions to improve current density distribution are proposed.