Sintered ferrite magnet and motor provided therewith
US9514871B2 · kind B2 · utility
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3References
4Claims
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Key dates
| Filing date | Feb 20, 2013 |
| Grant date | Dec 6, 2016 |
| Priority date | — |
| Expiry date | Jun 4, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/788
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Provided is a sintered ferrite magnet 10 that comprises Sr ferrite having a hexagonal crystal structure, wherein the total amount of Na and K is 0.004 to 0.31% by mass in terms of Na2O and K2O, an amount of Si is 0.3 to 0.94% by mass in terms of SiO2, and the following Expression (1) is satisfied.1.3≦(SrF+Ba+Ca+2Na+2K)/Si≦5.7 (1)[In Expression (1), SrF represents an amount of Sr, on a molar basis, other than Sr which constitutes the Sr ferrite, and Ba, Ca, Na, and K represent amounts of respective elements on a molar basis.]
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.