Influence of magnetic anisotropy on flux density changes in dynamo steel sheets

Abstract

Magnetic measurements, carried out by means of the Epstein frame, have shown that most typical dynamo steel sheets have certain anisotropic properties. In numerical analysis, anisotropic properties are taken into account with the use of the special function of the grain distribution in the given dynamo sheet. For engineering purposes, it is desirable to assess the influence of these properties on the changes of the magnetic flux density in typical dynamo steel sheets, especially during the rotational magnetization. For this purpose, measurements of the flux density changes and field strength changes in the circular-shaped samples of two selected typical dynamo sheets were performed. These measurements were carried out for several values of the current flowing in windings which generated the axial or rotational magnetic field in the test dynamo sheet. The influence of the magnetic anisotropy on the magnetization process was briefly discussed for both types of the magnetization processes.

Modelling of magnetisation processes in transformer steel sheets

“…However, direct consideration of the magnetic hysteresis by introducing a certain model of this phenomenon into the field distribution equations is not possible in methods such as the finite difference method, and the finite element method, because these methods are based on the differential form of the Maxwell's equations. The introduction of the hysteresis model into the equations of the magnetic field distribution is possible in the equivalent reluctance network method, which is based on Maxwell's equations in the integral form or using a significant modification of this method described in [6,7].…”