Permanent magnet, motor, and generator
US9714458B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 2015 |
| Grant date | Jul 25, 2017 |
| Priority date | — |
| Expiry date | Feb 23, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K1/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The embodiments provide a high-performance permanent magnet. The permanent magnet includes a sintered body having a composition expressed by a composition formula RpFeqMrCutCo100-p-q-r-t, with carbon in a range from 50 mass ppm to 1500 mass ppm. The sintered body also includes a metallic structure. The metallic structure includes a main phase having a Th2Zn17 crystal phase, and a secondary phase having a carbide phase of the M element of the composition formula. A ratio (I2/I1) of a maximum intensity I2 of a diffraction peak at an angle 2θ in a range from 37.5 degrees to 38.5 degrees to a maximum intensity I1 of a diffraction peak at the angle 2θ in a range from 32.5 degrees to 33.5 degrees is greater than 25 but no greater than 80 in an X-ray diffraction pattern obtained by applying an X-ray diffraction measuring method to the sintered body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.