Journal of Microwaves, Optoelectronics and Electromagnetic Applications, Vol. 20, No. 4, December 2021 Brazilian Microwave and Optoelectronics Society-SBMO received 18 Jan 2021; for review 18 Jan 2021; accepted 3 May 2021 Brazilian Society of Electromagnetism-SBMag © 2021 SBMO/SBMag ISSN 2179-1074 DOI: http://dx.doi.org/10.1590/2179-10742021v20i4254770 763 Abstract— In this work we propose a new method to separate iron losses by removing low frequency tests and reducing the number of experiments. The article deals with methodologies that use numerical methods to find the mathematical model coefficients of magnetic loss separation in hysteresis loss (Wh), eddy current loss (Wed) and excess loss (Wex). Three methodologies are presented and depend on experimental tests such as (i) varying magnetic induction Bm and constant supply frequency (f) of 50 Hz, (ii) constant magnetic induction around 1 T and varying frequency. The first methodology is based on Newton’s method to solve the numerical system generated with experimental data from two laboratory experiments. These data were reported in past references. Another two methodologies are based on genetic algorithms (GA). One of them depends on experimental data from both experiments and the another depends on experimental data only from experiment (i). Results indicate that genetic algorithms method presents excellent solutions in comparison with other ones. The GA method with two tests allows a better representation of the experimental behavior of the sample with maximum errors varying from 1.10% to 0.20%. In GA method with one test, minimization varied from 6.924 x 10 -05 to 3.186 x 10 -05 . Index Terms— Genetic algorithms, iron losses, Newton’s method. I. INTRODUCTION Electrical machines have ferromagnetic material core whose magnetic behavior has been investigated extensively [1]-[17]. Such studies model the magnetic behavior of the material, describe magnetic hysteresis phenomena and allow formulations for representing magnetic losses. Iron losses have been studied and there are steel test benches for electrical purposes operating with frequency variation, but do not allow ignoring dynamic losses. Iron losses are of key importance since they affect the design of electrical machines. In the last five years researches have been performed [1]-[3] in order to propose new iron losses models; they are compared with existing ones. In [1] the prediction of excess loss from three models were compared: two models on frequency domain and third one in time domain. The accuracy of the models was tested in sinusoidal and non-sinusoidal magnetic flux waveform. In [2] an iron loss model was developed considering the temperature influence on hysteresis and eddy current losses. The measured iron losses have shown that hysteresis and eddy current losses vary linearly with temperatures between 40 and 100 ºC. The advantage of this model is its utility on the analysis of electromagnetic and thermal coupling for predicting iron loss and A New Method for Iron Loss Separation Filomena B. R. Mendes 1 , Fredy M. S. Suárez 1 , Nelson J. Batistela 2 , Jean V. Leite 2 , Nelson Sadowski 2 , João P. A. Bastos 2 1 UTFPR, DAELE, DAMAT, Pato Branco PR, 85503-390, Brazil, filomena@utfpr.edu.br, fredy@utfpr.edu.br, 2 GRUCAD, EEL, UFSC, Florianópolis SC, PO. Box 476, 88040-970, Brazil, jhoe.batistela@ufsc.br, jean.vianei@ufsc.br, nelson.sadowski@ufsc.br, assumpcao.bastos@ufsc.br