{"title":"Metrological determination of the soft magnetic properties of slot wedge material in electrical machines","authors":"Florian Kirchner , Andreas Kremser","doi":"10.1016/j.jmmm.2025.172801","DOIUrl":null,"url":null,"abstract":"<div><div>Soft magnetic slot wedges as a composite of iron powder, resin and glass fiber are used to close the slots for the winding in electrical machines. Due to their magnetic properties, they influence the magnetic air gap field and the stray behavior of the electrical machine. By precisely dimensioning the material parameters, a reduction in the additional no-load losses and respectively an increase in the efficiency of the machines can be achieved. The determination and validation of the material properties are essential for the development of suitable materials and machine models. This document presents a measurement method for determining the magnetization curve and total losses, which in particular also enables the application to anisotropic materials as well as powders and pastes. The method was validated by comparative measurements using a standardized measurement method. After validation, various slot wedge materials were tested, and the results compared. It is shown that the magnetization curve and the total losses are depending on the filler share of soft magnetic particles. Using the specialized measurement setup, it was also found that some traditional soft magnetic slot wedge materials show anisotropic characteristics. In machine models with soft magnetic slot wedges, the investigated anisotropy as well as the total losses have not been considered in detail yet.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"615 ","pages":"Article 172801"},"PeriodicalIF":3.0000,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Magnetism and Magnetic Materials","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0304885325000320","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Soft magnetic slot wedges as a composite of iron powder, resin and glass fiber are used to close the slots for the winding in electrical machines. Due to their magnetic properties, they influence the magnetic air gap field and the stray behavior of the electrical machine. By precisely dimensioning the material parameters, a reduction in the additional no-load losses and respectively an increase in the efficiency of the machines can be achieved. The determination and validation of the material properties are essential for the development of suitable materials and machine models. This document presents a measurement method for determining the magnetization curve and total losses, which in particular also enables the application to anisotropic materials as well as powders and pastes. The method was validated by comparative measurements using a standardized measurement method. After validation, various slot wedge materials were tested, and the results compared. It is shown that the magnetization curve and the total losses are depending on the filler share of soft magnetic particles. Using the specialized measurement setup, it was also found that some traditional soft magnetic slot wedge materials show anisotropic characteristics. In machine models with soft magnetic slot wedges, the investigated anisotropy as well as the total losses have not been considered in detail yet.
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The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public.
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