New approximate method for calculating three-dimensional magnetic fields in laminated cores

A new approximate method for calculating three-dimensional magnetic fields in laminated cores has been developed by modifying the two-dimensional finite element method. Using this new method, both computer storage and computing time can be considerably reduced compared with a three-dimensional analysis. In this paper, the new technique is explained, and then its usefulness is shown by applying it to the analysis of flux distributions at the T-joint of the so-called scrap-less type three-phase transformer core.