Permanent magnet, rotary electrical machine, and vehicle
US10951074B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 2017 |
| Grant date | Mar 16, 2021 |
| Priority date | — |
| Expiry date | Dec 26, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/0596
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A permanent magnet is expressed by a composition formula: RpFeqMrCutCo100-p-q-r-t. The magnet comprises a metal structure including a main phase having a Th2Zn17 crystal phase and a grain boundary phase. The main phase includes a cell phase having the Th2Zn17 crystal phase and a Cu-rich phase. A section including a c-axis of the Th2Zn17 crystal phase has a first region in the crystal grain and a second region in the crystal grain, the first region is provided in the cell phase divided by the Cu-rich phase, the second region is provided within a range of not less than 50 nm nor more than 200 nm from the grain boundary phase in a direction perpendicular to an extension direction of the grain boundary phase, and a difference between a Cu concentration of the first region and a Cu concentration of the second region is 0.5 atomic percent or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.