@inproceedings{HafnerHenrotteHerranzGraciaetal., author = {Hafner, Martin and Henrotte, Francois and Herranz Gracia, Mercedes and Hameyer, Kay}, title = {An energy-based harmonic constitutive law for magnetic cores with hysteresis}, series = {16th International Conference on the Computation of Electromagnetic Fields}, booktitle = {16th International Conference on the Computation of Electromagnetic Fields}, abstract = {In this paper a phenomenogical energy-based harmonic ferromagnetic material model is presented which considers time-dependent hysteresis losses as a part of the material characteristic. The model is based on the effective reluctivity concept and can be applied to simulate hysteresis losses of electromechanic devices. The hysteresis losses of a C-Core are simulated and compared to the results of an iron loss estimation by loss curves.}, language = {en} } @article{JacobsHectorsHenrotteetal., author = {Jacobs, Sigrid and Hectors, Dietrich and Henrotte, Fran{\c{c}}ois and Hafner, Martin and Herranz Gracia, Mercedes and Hameyer, Kay and Goes, Patrick}, title = {Magnetic material optimization for hybrid vehicle PMSM drives}, series = {World Electric Vehicle Journal}, volume = {3}, journal = {World Electric Vehicle Journal}, number = {4}, issn = {2032-6653}, doi = {10.3390/wevj3040875}, pages = {875 -- 883}, abstract = {The motivation of this analysis is the need of high efficiency and high power density permanent magnet synchronous motor (PMSM) drives for use in electrical vehicle power trains. It is clear that the chosen electrical steel for the lamination stack plays an important role, but proper quantification is missing. The purpose of this paper is to formalize the problem of selecting the optimal steel grade for the construction of PMSM's. This question is important to steel producers, not only for helping customers selecting the most appropriate existing grade for their application, but also for defining the strategic orientation of the further R\&D of enhanced electrical steel grades. The notion of steel efficiency is defined and, after describing the FE implementation of iron loss models, a methodology for material optimisation is proposed.}, language = {en} } @article{HafnerHenrotteHerranzGraciaetal., author = {Hafner, Martin and Henrotte, Francois and Herranz Gracia, Mercedes and Hameyer, Kay}, title = {An Energy-Based Harmonic Constitutive Law for Magnetic Cores With Hysteresis}, series = {IEEE Transactions on Magnetics}, volume = {44}, journal = {IEEE Transactions on Magnetics}, number = {6}, publisher = {IEEE}, doi = {10.1109/TMAG.2007.916141}, pages = {922 -- 925}, abstract = {In this paper, a phenomenological energy-based material model for ferromagnetic materials under harmonic conditions is presented. The model is based on the concept of a complex effective permeability and an accurate representation of energy is adopted as identification criteria. The material model is implemented in a time-harmonic finite element model, which allows to solve for the loss characteristics of electromagnetic devices. Identification is based on measured hysteresis loops and no additional fitting parameters are required. Hysteresis losses in a ferromagnetic C-core and a ferromagnetic torus are simulated and compared to the results obtained by means of tabulated loss characteristics.}, language = {en} }