Improved numerical modelling and characterization of ferromagnetic materials and their losses

铁耗的准确估计已成为电磁设计中的一个突出问题。如今，铁损的计算经过了相当大的简化。在场计算中，铁磁材料被假定为非导电和无耗散的，这代表了模型的一个扭曲。该项目旨在填补这一空白，旨在为叠层铁磁铁芯应用中的铁损分析建立科学背景，为设计者评估降低损耗的设计措施和最佳材料选择提供建模工具。这些工具还将有助于及时满足即将出台的欧盟关于电机效率和生态设计要求的法规。到目前为止，还没有同时考虑矢量滞后、层叠结构和参数识别问题的宏观材料模型。提出的研究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相关物理知识，并具有可通过测量确定的自由参数。半物理模型的参数被认为比经验模型的参数更本征和客观，因此与微观结构参数有更好的相关性，这使得从微观结构来解释宏观模拟结果成为可能。

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.