Permanent magnet, motor, and generator
US10770208B2 · kind B2 · utility
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4References
13Claims
0Family size
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Key dates
| Filing date | Mar 18, 2015 |
| Grant date | Sep 8, 2020 |
| Priority date | — |
| Expiry date | Jul 26, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/0226
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A high performance permanent magnet is provided. The permanent magnet includes a composition represented by a composition formula: RpFeqMrCutCo100-p-q-r-t, and a metallic structure including cell phases having a Th2Zn17 crystal phase and Cu-rich phases having higher Cu concentration than the cell phases. An average diameter of the cell phases is 220 nm or less, and in a numeric value range from a minimum diameter to a maximum diameter of the cell phases, a ratio of a number of cell phases having a diameter in a numeric value range of less than upper 20% from the maximum diameter is 20% or less of all the cell phases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.