Permanent magnet, and motor and generator using the same
US10480052B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 1, 2016 |
| Grant date | Nov 19, 2019 |
| Priority date | — |
| Expiry date | Feb 4, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/0226
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent magnet of the embodiment includes: a composition represented by a composition formula: R(FepMqCurCtCo1-p-q-r-t)z (R is at least one element selected from rare-earth elements, M is at least one element selected from Ti, Zr and Hf, 0.27≤p≤0.45, 0.01≤q≤0.05, 0.01≤r≤0.1, 0.002≤t≤0.03, and 6≤z≤9); and a metallic structure including a main phase containing a Th2Zn17 crystal phase, and a sub phase of the element M having an element M concentration of 30 atomic % or more. The sub phase of the element M precipitates in the metallic structure. A ratio of a circumferential length to a precipitated area of the sub phase of the element M is 1 or more and 10 or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.