Abstract
Recycling rare earth permanent magnets is becoming
an important alternative source of supply of raw materials
for neodymium-iron-boron (Nd-Fe-B) permanent magnets. This
article documents a recycling case-study in which isotropic
binder-free magnet powder is extracted and recycled from
hermetically-sealed rotors. The extraction process is detailed, and
the influence of demagnetization-temperature on the magnetic
performance of the recycled product is studied and reported on.
Both intrinsic coercivities and the squareness factor of the demagnetization
curves are observed to decrease with demagnetizationtemperature.
Back-emf measurements of recycled rotors support
the relatively low reduction in remanence flux density measured.
The results suggest that a protective atmosphere is needed during
the heat treatment, by which the rotors are demagnetized, in
order to avoid oxidation of the powder.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 2015 IEEE International Electric Machines and Drives Conference (IEMDC) |
| Publisher | IEEE Press |
| Publication date | 2015 |
| Pages | 1242-1246 |
| ISBN (Print) | 978-1-4799-7940-0 |
| DOIs | |
| Publication status | Published - 2015 |
| Event | IEEE International Electric Machine and Drives Conference - Coeur d’Alène, Idaho, United States Duration: 10 May 2015 → 13 May 2015 Conference number: 2015 http://iemdc.org/ |
Conference
| Conference | IEEE International Electric Machine and Drives Conference |
|---|---|
| Number | 2015 |
| Country/Territory | United States |
| City | Coeur d’Alène, Idaho |
| Period | 10/05/2015 → 13/05/2015 |
| Internet address |
Keywords
- Electromagnetic analysis
- Magnetization processes
- Materials testing
- Permanent magnet machines
- Permanent magnet motors
- Rare earth metals
- Recycling
- Rotating machines