High frequency magnetic loss characteristic analysis and calculation of magnetostrictive Tb-Dy-Fe alloys under multivariable comprehensive operation conditions

Abstract

The accurate calculation of magnetic energy losses for electromagnetic materials directly affects the global optimization design and operating efficiency of electromagnetic devices, especially under high frequency excitation. This study gropes for measurement methods of hysteresis, loss, and temperature rise characteristics for magnetostrictive Tb-Dy-Fe alloys materials under comprehensive operation conditions of high-frequency excitation, compressive stresses, temperature, and DC bias. Based on the measured data, a multiple variables loss matrix that can describe the characteristics of multiple energy fields (electromagnetic-, thermal- and mechanical fields) is established. Using loss matrix transformation method, the variation of hysteresis loss coefficients and generalized eddy current loss coefficients with different energy field characteristic variables are obtained. By establishing a dual statistical framework of sensitivity and deviation degree, the main influence variables which have the greatest impact on loss coefficients are extracted from these variables. Then a loss model for magnetostrictive material considering comprehensive operation conditions is presented which can describe the output characteristics of electromagnetic devices with strong non-linearity and multi-coupling effects among different energy fields. Furthermore, this method allows for the expansion of dimensions of linear or nonlinear variables and considers more energy fields, enabling a comprehensive analysis of interplay between multiple fields and facilitating engineering calculations.