Improved numerical modelling and characterization of ferromagnetic materials and their losses

铁耗的准确估算已成为电磁设计中的一个突出问题。现在铁损的计算是经过相当简化的。铁磁材料被假定为非导电和非耗散的场计算，这代表了扭曲的建模。该项目旨在填补这一空白，旨在为叠层铁磁芯应用中的铁损分析建立科学背景，为设计人员提供建模工具，以评估降低损耗和最佳材料选择的设计措施。这些工具也将有助于及时与即将到来的欧盟法规，关于电机的效率和生态设计的要求。目前还没有同时考虑矢量滞后，层压结构和参数识别问题的宏观材料模型。在拟议的研究中的一个中心特征是建立一个半物理模型作为测量数据和宏观材料特性之间的中间表示。半物理模型包含尽可能多的物理学，并具有通过测量识别的自由参数。与经验模型相比，半物理模型的参数更内在、更客观，与微观结构参数的相关性更好，可以从微观结构角度解释宏观模拟结果。

The accurate estimation of iron losses has become a prominent problem in electromagnetic design. Iron losses are calculated nowadays after considerable simplification. Ferromagnetic materials are assumed non-conductive and non-dissipative for the field computation, which represents a twist in the modelling. This project aims at filling this gap.It is intended to establish a scientific background for the analysis of iron losses in applications involving laminated ferromagnetic cores, providing designers with modelling tools to evaluate design measures for loss reduction and optimum material choice. These tools will also contribute to be on time with the upcoming EU regulations as regards the efficiency of electrical machines and ecodesign requirements.There exist so far no macroscopic material model considering simultaneously vector hysteresis, the laminated structure and the issue of parameter identification. A central feature in the proposed research is to establish a semi-physical model as an intermediate representation between measured data and macroscopic material characteristics. The semi-physical model contains as much as possible of the physics involved and has free parameters to be identified by measurements. The parameters of a semi-physical model are ex-pected to be more intrinsic and objective than those of empirical models, and hence better correlated with microstructure parameters, making it possible to interpret macroscopic simulation results in terms of micro-structure.