Sintered ferrite magnet and motor provided therewith
US9589713B2 · kind B2 · utility
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7Claims
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Key dates
| Filing date | Mar 4, 2015 |
| Grant date | Mar 7, 2017 |
| Priority date | — |
| Expiry date | Oct 12, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/96
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A sintered ferrite magnet comprises a main phase of an M type Sr ferrite having a hexagonal crystal structure. An amount of Zn is 0.05 to 1.35 mass % in terms of ZnO, the sintered ferrite magnet does not substantially include a rare-earth element (R), and the following Formula (1) is satisfied, where a total amount of Sr, Ba and Ca is M3 in terms of mol, a total amount of Fe, Co, Mn, Zn, Cr and Al is M4 in terms of mol, and an amount of Si is M5 in terms of mol.0.5≦{M3−(M4/12)}/M5≦4.8 (1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.