Irreversible Demagnetization Improvement Process of Hybrid Traction Motors with Dy-Free Magnets
Permanent magnet synchronous motors (PMSMs), with their high power density, high efficiency, and thermal stability, are widely used nowadays. PMSM magnets are composed of rare earth elements. However, rare earth elements are subject to severe price fluctuations because of their limited availability...
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| Format: | Article |
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MDPI AG
2022-12-01
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| Series: | Machines |
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| Online Access: | https://www.mdpi.com/2075-1702/11/1/4 |
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| author | Si-Woo Song Hyun-Jo Pyo Dong-Woo Nam Ju Lee Won-Ho Kim |
| author_facet | Si-Woo Song Hyun-Jo Pyo Dong-Woo Nam Ju Lee Won-Ho Kim |
| author_sort | Si-Woo Song |
| collection | DOAJ |
| description | Permanent magnet synchronous motors (PMSMs), with their high power density, high efficiency, and thermal stability, are widely used nowadays. PMSM magnets are composed of rare earth elements. However, rare earth elements are subject to severe price fluctuations because of their limited availability and the monopoly of some countries. Therefore, extensive research on magnets devoid of rare earth elements has been conducted recently. Although a magnet devoid of rare earth elements has a high irreversible demagnetization rate at high temperatures owing to its low coercive force, an irreversible demagnetization improvement process is proposed in this paper to compensate for this disadvantage. This process analyzes the contribution of the magnet’s back EMF (electromotive force) using the flux linkage equation, which does not change with time. Next, the location of irreversible demagnetization is moved to a position with a low contribution to the back electromotive force. Consequently, even if irreversible demagnetization occurs at the same size, the irreversible demagnetization ratio is reduced. The proposed process can minimize irreversible demagnetization while maintaining performance. |
| first_indexed | 2024-03-09T11:54:51Z |
| format | Article |
| id | doaj.art-cd1e41a1d9894e7c91b19c47a1f4575d |
| institution | Directory Open Access Journal |
| issn | 2075-1702 |
| language | English |
| last_indexed | 2024-03-09T11:54:51Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
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| series | Machines |
| spelling | doaj.art-cd1e41a1d9894e7c91b19c47a1f4575d2023-11-30T23:10:34ZengMDPI AGMachines2075-17022022-12-01111410.3390/machines11010004Irreversible Demagnetization Improvement Process of Hybrid Traction Motors with Dy-Free MagnetsSi-Woo Song0Hyun-Jo Pyo1Dong-Woo Nam2Ju Lee3Won-Ho Kim4Department of Electrical Engineering, Hanyang University, Seoul 133-791, Republic of KoreaDepartment of Electrical Engineering, Gachon University, Seongnam 461-701, Republic of KoreaDepartment of Electrical Engineering, Gachon University, Seongnam 461-701, Republic of KoreaDepartment of Electrical Engineering, Hanyang University, Seoul 133-791, Republic of KoreaDepartment of Electrical Engineering, Gachon University, Seongnam 461-701, Republic of KoreaPermanent magnet synchronous motors (PMSMs), with their high power density, high efficiency, and thermal stability, are widely used nowadays. PMSM magnets are composed of rare earth elements. However, rare earth elements are subject to severe price fluctuations because of their limited availability and the monopoly of some countries. Therefore, extensive research on magnets devoid of rare earth elements has been conducted recently. Although a magnet devoid of rare earth elements has a high irreversible demagnetization rate at high temperatures owing to its low coercive force, an irreversible demagnetization improvement process is proposed in this paper to compensate for this disadvantage. This process analyzes the contribution of the magnet’s back EMF (electromotive force) using the flux linkage equation, which does not change with time. Next, the location of irreversible demagnetization is moved to a position with a low contribution to the back electromotive force. Consequently, even if irreversible demagnetization occurs at the same size, the irreversible demagnetization ratio is reduced. The proposed process can minimize irreversible demagnetization while maintaining performance.https://www.mdpi.com/2075-1702/11/1/4traction motorhybrid traction motorirreversible demagnetizationback EMF contribution analysisdemagnetizationDy |
| spellingShingle | Si-Woo Song Hyun-Jo Pyo Dong-Woo Nam Ju Lee Won-Ho Kim Irreversible Demagnetization Improvement Process of Hybrid Traction Motors with Dy-Free Magnets Machines traction motor hybrid traction motor irreversible demagnetization back EMF contribution analysis demagnetization Dy |
| title | Irreversible Demagnetization Improvement Process of Hybrid Traction Motors with Dy-Free Magnets |
| title_full | Irreversible Demagnetization Improvement Process of Hybrid Traction Motors with Dy-Free Magnets |
| title_fullStr | Irreversible Demagnetization Improvement Process of Hybrid Traction Motors with Dy-Free Magnets |
| title_full_unstemmed | Irreversible Demagnetization Improvement Process of Hybrid Traction Motors with Dy-Free Magnets |
| title_short | Irreversible Demagnetization Improvement Process of Hybrid Traction Motors with Dy-Free Magnets |
| title_sort | irreversible demagnetization improvement process of hybrid traction motors with dy free magnets |
| topic | traction motor hybrid traction motor irreversible demagnetization back EMF contribution analysis demagnetization Dy |
| url | https://www.mdpi.com/2075-1702/11/1/4 |
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