Magnetization process in electrical steel sheets

电工钢板的磁化过程

• 批准号: 399450968
• 负责人: Dr. Ivan Soldatov
• 金额: --
• 依托单位: Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (IFW) e.V.
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/399450968?language=en
• 关键词: Magnetization; process; electrical; steel; sheets

The energy losses in transformers, generators and electro-motors, where electrical steel sheets are utilized, are strongly determined by the magnetic domains in these sheets. The understanding of the loss mechanisms and the development of strategies for their reduction therefore requires fundamental studies of the domains and magnetization processes by microscopic imaging. To lower eddy current effects, however, the sheets are covered by non-transparent insulation coatings that make a direct observation of the domain structure by optical means impossible. For magneto-optical Kerr microscopy this cover layer has to be removed and the surface has to be carefully polished, which unfortunately leads to drastic changes of the magnetic properties and domain structure. By using a recently developed new generation of magneto-optical indicator films (MOIF), which are placed on top of coated sheets and which indirectly reveal the underlying domain distribution, the situation has considerably changed: the domains can now be imaged in the presence of insulation coatings with a sufficient resolution and even in a time-resolved manner by single-shot imaging at power frequencies. The indicator films furthermore allow for the imaging of magnetic poles at grain boundaries, making it possible to study the role of grain boundaries for the flux transport. In this project the potential of the MOIF films shall be used to obtain a deeper understanding of the quasistatic and dynamic magnetization processes in electrical steel under working conditions. The goal is a fundamental understanding of the microscopic sources of energy loss to provide a basis for a targeted minimization of loss in electrical devices and machines.

使用电工钢板的变压器、发电机和电动机中的能量损耗很大程度上取决于这些钢板中的磁畴。因此，了解损耗机制并制定减少损耗的策略需要通过显微成像对磁畴和磁化过程进行基础研究。然而，为了降低涡流效应，薄片被不透明的绝缘涂层覆盖，这使得通过光学手段直接观察域结构变得不可能。对于磁光克尔显微镜，必须去除该覆盖层，并且必须仔细抛光表面，不幸的是，这会导致磁性和磁畴结构的急剧变化。通过使用最近开发的新一代磁光指示膜（MOIF）（将其放置在涂层片材的顶部并间接揭示底层磁域分布），情况发生了很大变化：现在可以在存在磁域的情况下对磁域进行成像。绝缘涂层具有足够的分辨率，甚至可以通过工频下的单次成像以时间分辨的方式进行。此外，指示剂膜还可以对晶界处的磁极进行成像，从而可以研究晶界对于通量传输的作用。在该项目中，应利用 MOIF 薄膜的潜力来更深入地了解工作条件下电工钢的准静态和动态磁化过程。目标是对能量损失的微观来源有一个基本的了解，为有针对性地最小化电气设备和机器的损失提供基础。

项目成果

Inverted Hysteresis, Magnetic Domains, and Hysterons

• DOI: 10.1109/lmag.2020.3035136
• 发表时间: 2020
• 期刊: IEEE Magnetics Letters
• 影响因子: 1.2
• 作者: I. Soldatov;P. Andrei;R. Schaefer

Role of the interfaces in the crystallization and hysteresis mechanisms of amorphous Fe-B thin films

界面在非晶 Fe-B 薄膜结晶和滞后机制中的作用

• DOI: 10.1016/j.jallcom.2021.159276
• 发表时间: 2021
• 期刊: Journal of Alloys and Compounds
• 影响因子: 6.2
• 作者: Unai Urdiroz;F Javier Palomares;A Mayoral;IV Soldatov;R Schäfer;JM Gonzalez;Marta Sanchez-Agudo;E Navarro;A Ruiz;María Alonso;Luis Vázquez;F Cebollada
• 通讯作者: F Cebollada

Advanced, Kerr-microscopy-based MOKE magnetometry for the anisotropy characterisation of magnetic films

• DOI: 10.1016/j.jmmm.2021.167889
• 发表时间: 2021-03-16
• 期刊: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
• 影响因子: 2.7
• 作者: Soldatov, I., V;Zehner, J.;Schafer, R.
• 通讯作者: Schafer, R.

Interpretation of Kerr Microscopic Domain Contrast on Curved Surfaces

曲面上克尔微观域对比的解释

• DOI: 10.1109/lmag.2021.3116791
• 发表时间: 2021
• 期刊: IEEE Magnetics Letters
• 影响因子: 1.2
• 作者: Ivan Soldatov;Valeria Kolesnikova;Valeria Rodionova;Rudolf Schäfer
• 通讯作者: Rudolf Schäfer

Analyser-free, intensity-based wide-field magneto-optical microscopy

免分析仪、基于强度的宽场磁光显微镜

• DOI: 10.1063/5.0051599
• 发表时间: 2021
• 作者: Rudolf Schäfer;Peter M. Oppeneer;Alexey V. Ognev;Alexander S. Samardak;Ivan V. Soldatov
• 通讯作者: Ivan V. Soldatov