Lixun Zhu

Finite-Element Analysis of Magnetostriction Force in Power Transformer Based on the Measurement of Anisotropic Magnetostriction of Highly Grain-Oriented Electrical Steel Sheet

This paper proposes a new measuring system and an improved model for magnetostriction characteristics of a highly grain-oriented electric steel sheet (HGO-ESS) whose magnetic domains are bigger in size and higher in the degree of alignment than those of a grain-oriented one. The measured data of anisotropic magnetostriction characteristics of the HGO-ESS, through an improved model that has its theoretical basis on the mechanical elasticity, are included in the finite-element analysis of magnetostriction force of a power transformer. The effectiveness of the measuring system and improved magnetostriction model is validated by comparing with the experimentally measured results over a 30 MVA power transformer model.

A novel iron loss calculation algorithm using vector play model taking account of the rotating magnetic fields

This paper proposes a new iron loss calculation algorithm taking rotating magnetic fields into account by incorporating a vector stop model and one-dimensional finite element analy of eddy current distribution. The algorithm is applied to a non-oriented material 35PN440, and its results are compared with conventional and the measured ones.