A Simple Method for Demagnetizing Large NdFeB Permanent Magnets
| Autor: | Asger Bech Abrahamsen, Greg Boland, Martin Alexander Eder, Christian R.H. Bahl |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Induction heating Materials science Demagnetizing field Magnetic separation 01 natural sciences Temperature measurement Electronic Optical and Magnetic Materials Magnetization Magnetic anisotropy Permanent magnet Neodymium magnet Magnet Wind turbines 0103 physical sciences Recycling Permanent magnet generators Electrical and Electronic Engineering Composite material |
| Zdroj: | Bahl, C R H, Eder, M A, Boland, G & Abrahamsen, A B 2020, ' A simple method for demagnetizing large NdFeB permanent magnets ', IEEE Transactions on Magnetics, vol. 56, no. 8 . https://doi.org/10.1109/TMAG.2020.3002098 |
| ISSN: | 1941-0069 0018-9464 |
| DOI: | 10.1109/tmag.2020.3002098 |
| Popis: | Prior to processing magnetic NdFeB material for recycling, it must be demagnetized. Here, we demonstrate a simple low-cost method. Large blocks of NdFeB permanent magnets of dimension 10 cm $\times 7$ cm $\times 2$ cm and with easy axis along the shortest dimension are shown to demagnetize when heated on a planar induction heating device. The initial magnetization of the magnets is reduced by a factor of 10 within a period of 30 min, in which the surface temperature of the magnet reaches 225 °C. This method simplifies the demagnetization process of the permanent magnets in wind turbine generators as part of the rapidly increasing demand for improved recycling capabilities of permanent magnets. |
| Databáze: | OpenAIRE |
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