Permanent magnet, and motor and generator using the same
US9773592B2 · kind B2 · utility
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11Claims
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Key dates
| Filing date | Mar 18, 2015 |
| Grant date | Sep 26, 2017 |
| 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 of an embodiment includes: a composition represented by a composition formula: R(FepMqCurCo1-p-q-r)z, where R is at least one element selected from rare-earth elements, M is at least one element selected from Zr, Ti, and Hf, and relations of 0.3≦p≦0.4, 0.01≦q≦0.05, 0.01≦r≦0.1, and 7≦z≦8.5 (atomic ratio) are satisfied; and a structure including a cell phase having a Th2Zn17 crystal phase, and a cell wall phase existing to surround the cell phase. An average magnetization of the cell wall phase is 0.2 T or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.