Permanent magnet, and motor and power generator using the same
US10593447B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2013 |
| Grant date | Mar 17, 2020 |
| Priority date | — |
| Expiry date | Nov 14, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K1/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In one embodiment, a permanent magnet includes a sintered compact including: a composition expressed by a composition formula: RpFeqMrCusCo100-p-q-r-s (R is at least one element selected from rare-earth elements, M is at least one element selected from Zr, Ti, and Hf, 10≤p≤13.3 at %, 25≤q≤40 at %, 0.87≤r≤5.4 at %, and 3.5≤s≤13.5 at %); and a metallic structure having a main phase including a Th2Zn17 crystal phase, and an R-M-rich phase containing the element R whose concentration is 1.2 times or more an R concentration in the main phase and the element M whose concentration is 1.2 times or more an M concentration in the main phase. A volume fraction of the R-M-rich phase in the metallic structure is from 0.2% to 15%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.