Ferrite sintered magnet and rotating electric machine
AssigneeTDK Corporation
InventorsShogo Muroya, Yoshitaka Murakawa, Hiroyuki Morita, Masanori Ikeda
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Abstract
To provide a ferrite sintered magnet having a high residual magnetic flux density (Br) and a high coercive force (HcJ), and also able to produce at a low cost. The ferrite sintered magnet includes a hexagonal M-type ferrite including A, R, Fe, and Co in an atomic ratio of A1-xRx(Fe12-yCoy)zO19. A is at least one selected from Sr, Ba, and Pb. R is La only or La and at least one selected from rare earth elements. 0.13≤x≤0.23, 10.80≤(12−y)z≤12.10, and 0.13≤yz≤0.20 are satisfied.
Claims7
A ferrite sintered magnet comprising a hexagonal M-type ferrite including A, R, Fe, and Co in an atomic ratio of A1-xRx(Fe12-yCoy)zO19, wherein
- A is at least one selected from Sr, Ba, and Pb,
- R is La only or La and at least one selected from rare earth elements, and
- 0.13≤x≤0.23,
- 10.80≤(12−y)z≤12.10, and
- 0.13<yz<0.20 are satisfied,
- 0.05≤Ma≤0.70 is satisfied in which Ma is Al2O3 content (mass %) converted from a content of Al included in the ferrite sintered magnet, and
- 0.30<Mc<0.85 is satisfied in which Mc is CaO content (mass %) converted from a content of Ca included in the ferrite sintered magnet.
Dependencies are inferred from the claim text.