Rare earth permanent magnet material, raw material composition, preparation method, application, and motor
US12272472B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 7, 2020 |
| Grant date | Apr 8, 2025 |
| Priority date | — |
| Expiry date | Oct 1, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F41/0293
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A rare earth permanent magnet material, a raw material composition, a preparation method, an application, and a motor. The present rare earth permanent magnet material comprises the following ingredients in mass percentage: R 28.5-33.0 wt. %; RH>1.5 wt. %; Cu 0-0.08 wt. %, but not 0 wt. %; Co 0.5-2.0 wt. %; Ga 0.05-0.30 wt. %; B 0.95-1.05 wt. %; and the remainder being Fe and unavoidable impurities. The R-T-B system permanent magnet material has excellent properties and, under the condition that the content of heavy rare earth elements in the permanent magnetic material is 3.0-4.5 wt. %, Br≥12.78 kGs and Hcj≥29.55 kOe; under the condition that the content of heavy rare earth elements in the permanent magnet material is 1.5-2.5 wt. %, Br≥13.06 kGs and Hcj≥26.31 kOe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.