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US09589713B2 Sintered ferrite magnet and motor provided therewith 有权
烧结铁氧体磁体和电动机

Sintered ferrite magnet and motor provided therewith
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).
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