Magnetization dependent demagnetization characteristic of rare-earth permanent magnets
Accurate demagnetization modelling is mandatory for a reliable design of rare-earth permanent magnet applications, such as e.g. synchronous machines. The magnetization of rare-earth permanent magnets requires high magnetizing fields. For technical reasons, it is not always possible to completely and...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Polish Academy of Sciences
2019-02-01
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| Series: | Archives of Electrical Engineering |
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| Online Access: | https://journals.pan.pl/Content/109912/PDF/AEE-68-1-2019_art_3.pdf |
| _version_ | 1818491173254201344 |
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| author | Gregor Bavendiek Fabian Müller Jamshid Sabirov Kay Hameyer |
| author_facet | Gregor Bavendiek Fabian Müller Jamshid Sabirov Kay Hameyer |
| author_sort | Gregor Bavendiek |
| collection | DOAJ |
| description | Accurate demagnetization modelling is mandatory for a reliable design of rare-earth permanent magnet applications, such as e.g. synchronous machines. The magnetization of rare-earth permanent magnets requires high magnetizing fields. For technical reasons, it is not always possible to completely and homogeneously achieve the required field strength during a pulse magnetization, due to stray fields or eddy currents. Not sufficiently magnetized magnets lose remanence as well as coercivity and the demagnetization characteristic becomes strongly nonlinear. It is state of the art to treat demagnetization curves as linear. This paper presents an approach to model the nonlinear demagnetization in dependence on the magnetization field strength. Measurements of magnetization dependent demagnetization characteristics of rare-earth permanent magnets are compared to an analytical model description. The physical meaning of the model parameters and the influence on them by incomplete magnetization are discussed for different rare-earth permanent magnet materials. Basically, the analytic function is able to map the occurring magnetization dependent demagnetization behavior. However, if the magnetization is incomplete, the model parameters have a strong nonlinear behavior and can only be partially attributed to physical effects. As a benefit the model can represent nonlinear demagnetization using a few parameters only. The original analytical model is from literature but has been adapted for the incomplete magnetization. The discussed effect is not sufficiently accurate modelled in literature. The sparse data in literature has been supplemented with additional pulsed-field magnetometer measurements. |
| first_indexed | 2024-12-10T17:27:13Z |
| format | Article |
| id | doaj.art-ec84f2d240e744b797af4c4d4f5c1f01 |
| institution | Directory Open Access Journal |
| issn | 2300-2506 |
| language | English |
| last_indexed | 2024-12-10T17:27:13Z |
| publishDate | 2019-02-01 |
| publisher | Polish Academy of Sciences |
| record_format | Article |
| series | Archives of Electrical Engineering |
| spelling | doaj.art-ec84f2d240e744b797af4c4d4f5c1f012022-12-22T01:39:48ZengPolish Academy of SciencesArchives of Electrical Engineering2300-25062019-02-01vol. 68No 13345https://doi.org/10.24425/aee.2019.125978Magnetization dependent demagnetization characteristic of rare-earth permanent magnetsGregor BavendiekFabian MüllerJamshid SabirovKay HameyerAccurate demagnetization modelling is mandatory for a reliable design of rare-earth permanent magnet applications, such as e.g. synchronous machines. The magnetization of rare-earth permanent magnets requires high magnetizing fields. For technical reasons, it is not always possible to completely and homogeneously achieve the required field strength during a pulse magnetization, due to stray fields or eddy currents. Not sufficiently magnetized magnets lose remanence as well as coercivity and the demagnetization characteristic becomes strongly nonlinear. It is state of the art to treat demagnetization curves as linear. This paper presents an approach to model the nonlinear demagnetization in dependence on the magnetization field strength. Measurements of magnetization dependent demagnetization characteristics of rare-earth permanent magnets are compared to an analytical model description. The physical meaning of the model parameters and the influence on them by incomplete magnetization are discussed for different rare-earth permanent magnet materials. Basically, the analytic function is able to map the occurring magnetization dependent demagnetization behavior. However, if the magnetization is incomplete, the model parameters have a strong nonlinear behavior and can only be partially attributed to physical effects. As a benefit the model can represent nonlinear demagnetization using a few parameters only. The original analytical model is from literature but has been adapted for the incomplete magnetization. The discussed effect is not sufficiently accurate modelled in literature. The sparse data in literature has been supplemented with additional pulsed-field magnetometer measurements.https://journals.pan.pl/Content/109912/PDF/AEE-68-1-2019_art_3.pdfdemagnetizationmagnetic hysteresismagnetization processespermanent magnets |
| spellingShingle | Gregor Bavendiek Fabian Müller Jamshid Sabirov Kay Hameyer Magnetization dependent demagnetization characteristic of rare-earth permanent magnets Archives of Electrical Engineering demagnetization magnetic hysteresis magnetization processes permanent magnets |
| title | Magnetization dependent demagnetization characteristic of rare-earth permanent magnets |
| title_full | Magnetization dependent demagnetization characteristic of rare-earth permanent magnets |
| title_fullStr | Magnetization dependent demagnetization characteristic of rare-earth permanent magnets |
| title_full_unstemmed | Magnetization dependent demagnetization characteristic of rare-earth permanent magnets |
| title_short | Magnetization dependent demagnetization characteristic of rare-earth permanent magnets |
| title_sort | magnetization dependent demagnetization characteristic of rare earth permanent magnets |
| topic | demagnetization magnetic hysteresis magnetization processes permanent magnets |
| url | https://journals.pan.pl/Content/109912/PDF/AEE-68-1-2019_art_3.pdf |
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