Abstract
Prior to processing magnetic NdFeB material for recycling it must be demagnetised. Here we demonstrate a simple low-cost method. Large blocks of NdFeB permanent magnets of dimension 10 cm × 7 cm × 2 cm and with the easy axis along the shortest dimension, are shown to demagnetise when heated on a planar induction heating device. The initial magnetisation of the magnets is reduced by a factor of 10 within a period of 30 minutes, in which the surface temperature of the magnet reaches 225 °C. This method simplifies the demagnetisation process of the permanent magnets in wind turbine generators as part of the rapidly increasing demand for improved recycling capabilities of permanent magnets.
Original language | English |
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Journal | IEEE Transactions on Magnetics |
Volume | 56 |
Issue number | 8 |
Number of pages | 6 |
ISSN | 0018-9464 |
DOIs | |
Publication status | Published - 2020 |
Keywords
- Permanent magnet
- Recycling
- Induction heating
- Permanent magnet generators
- Wind turbines