Permanent magnet and motor and generator using the same
US8211246B2 · kind B2 · utility
2Cited by
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17Claims
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Key dates
| Filing date | Mar 16, 2011 |
| Grant date | Jul 3, 2012 |
| Priority date | — |
| Expiry date | Mar 16, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K1/2766
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
In one embodiment, a permanent magnet has a composition represented by (Sm1-xRx)(FepMqCurCo1-p-q-r)z, where R is at least one element selected from Nd and Pr, M is at least one element selected from Ti, Zr and Hf, and 0.22≦p≦0.45, 0.005≦q≦0.05, 0.01 ≦r≦0.1, 0.05≦x<0.5, and 7≦z≦9. The permanent magnet includes a Th2Zn17 crystal phase as a main phase, and a ratio of diffraction peak intensity I(113) from a (113) plane of the Th2Zn17 crystal phase in powder X-ray diffraction to diffraction peak intensity I(300) from a (300) plane in powder X-ray diffraction is in a range of 0.9≦I(113)/I(300)≦1.7.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.