Permanent magnet, rotary electric machine, and vehicle
US10535452B2 · kind B2 · utility
1Cited by
4References
11Claims
0Family size
Assignee
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Key dates
| Filing date | Mar 2, 2018 |
| Grant date | Jan 14, 2020 |
| Priority date | — |
| Expiry date | Jul 26, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K7/003
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A high-performance permanent magnet is provided. The magnet is expressed by a composition formula: RpFeqMrCutCo100-p-q-r-t. The magnet includes a sintered body including: a plurality of crystal grains each having a Th2Zn17 crystal phase; and a plurality of grain boundaries between the crystal grains. If an oxide phase of the R element is defined by a continuous region that is disposed in the sintered body and contains the R element and oxygen having a concentration of 85 atomic percent or more, a ratio of the number of the oxide phases in the grain boundaries to the number of the crystal grains is 1.1 or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.