Permanent magnet, motor, and generator
US9502165B2 · kind B2 · utility
0Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 18, 2015 |
| Grant date | Nov 22, 2016 |
| Priority date | — |
| Expiry date | Mar 18, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/0596
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent magnet includes: a composition expressed by a composition formula: RpFeqMrCutCo100-p-q-r-t (R is at least one element selected from rare-earth elements, M is at least one element selected from Zr, Ti, and Hf, 10.5≦p≦12.5 at %, 23≦q≦40 at %, 0.88≦r≦4.5 at %, 4.5≦t≦10.7 at %); and a metal structure containing a Th2Zn17 crystal phase and a Cu-rich phase having a Cu concentration higher than that of the Th2Zn17 crystal phase. In a cross section including a c-axis of the Th2Zn17 crystal phase, a number of intersections of the Cu-rich phases existing in an area of 1 μm square is 10 or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.