Ferrite sintered magnet and rotating electric machine

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United States of America Patent

PATENT NO 11664142
APP PUB NO 20210304935A1
SERIAL NO

17201809

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Abstract

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To provide a ferrite sintered magnet having a high residual magnetic flux density (Br), a high coercive force (HcJ), a good production stability, 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. 0.14≤x≤0.22, 11.60≤(12-y)z≤11.99, and 0.13≤yz≤0.17 are satisfied. 0.30≤Mc≤0.63 is satisfied in which Mc is CaO content (mass %) converted from a content of Ca included in the ferrite sintered magnet.

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Patent Owner(s)

Patent OwnerAddress
TDK CORPORATIONTOKYO 103-6128

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ikeda, Masanori Tokyo, JP 87 451
Morita, Hiroyuki Tokyo, JP 116 1035
Murakawa, Yoshitaka Tokyo, JP 32 367
Muroya, Shogo Tokyo, JP 14 11

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