Journal article · Ahead of Print article
A simple method for demagnetizing large NdFeB permanent magnets
Department of Energy Conversion and Storage, Technical University of Denmark1
Continuum Modelling and Testing, Department of Energy Conversion and Storage, Technical University of Denmark2
Wind Turbine Structures and Component Design, Department of Wind Energy, Technical University of Denmark3
Department of Wind Energy, Technical University of Denmark4
Technical University of Denmark5
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.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2020 |
| Pages: | 1-6 |
| ISSN: | 19410069 and 00189464 |
| Types: | Journal article and Ahead of Print article |
| DOI: | 10.1109/TMAG.2020.3002098 |
| ORCIDs: | Bahl, Christian R.H. , Eder, Martin A. and Abrahamsen, Asger B. |
