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Japan Energy Corporation

Nec Corporation

Honda Motor Co., Ltd.

Janome Sewing Machine Industry Co., Ltd.

Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Morita, Hiroyuki

Hiroyuki Morita

Masanori Ikeda

Yoshitaka Murakawa

Shogo Muroya

Takahiro Mori

Yoshihiko Minachi

Koichiro Tani

Ryoji Tanaka

Takeshi Yuasa

Koji Okada

Junichi Nagaoka

Nobuhiro Suto

Masahiro Shibata

Taku Murase

Takahiro Kawai

Tatsuya Kato

Katsuhiro Suzuki

Ryouji Tanaka

Naoya Nosaka

Takaomi Matsumoto

Tomokazu Ishikura

Tatsuya Katoh

Hiroyuki Ono

Akira Orii

Koji Suzuki

Yoshiaki Isobe

Shigeru Abe

Hironao Sajiki

Satoru Manabe

Ken'ichi Furukawa

Junji Kawai

Masaaki Inoue

Shigeki Yanagida

Kouji Teranishi

Yusuke Amano

Haruo Takaku

Tsuguhito Ichiriki

Takumi Adachi

Hidemi Minami

Hiroaki Kano

Rikimaru Kuwabara

Nobuyoshi Chiba

Hideyuki Furuya

Noriko Mashimo

Naoyuki Horii

Naoto Oji

Kohsaku Hirota

Syunsuke Kariya

Masaya Yoneyama

Isao Iwasaki

Shinichi Kawada

Osamu Ohkubo

Kouei Matsuzaki

Makoto Tanigawa

Kose Michibuchi

Yukitaka Takatsu

Yoichi Ohba

Ryota Funaki

Teruyoshi Nagano

Bunpei Takemura

This ferrite sintered magnet comprises ferrite phases having a magnetoplumbite type crystal structure. This magnet comprises an element R, an element M, Fe, Co, B, Mn and Cr, the element R is at least one element selected from rare earth elements including Y, the element M is at least one element selected from the group consisting of Ca, Sr and Ba, with Ca being an essential element, and when an atomic composition of metallic elements is represented by RMFeCo, x, y and m satisfy formulae:0.2&#x2264;&#x2264;0.8&#x2003;&#x2003;(1)0.1&#x2264;&#x2264;0.65&#x2003;&#x2003;(2)3&#x2264;&#x3c;14&#x2003;&#x2003;(3). Additionally, a content of B is 0.1 to 0.4% by mass in terms of BO, a content of Mn is 0.15 to 1.02% by mass in terms of MnO, and a content of Cr is 0.02 to 2.01% by mass in terms of CrO.

Ferrite sintered magnet, ferrite particle, bonded magnet and rotating electric machine

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 AR(FeCo)O. 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&#x2264;x&#x2264;0.22, 11.60&#x2264;(12-y)z&#x2264;11.99, and 0.13&#x2264;yz&#x2264;0.17 are satisfied. 0.30&#x2264;Mc&#x2264;0.63 is satisfied in which Mc is CaO content (mass %) converted from a content of Ca included in the ferrite sintered magnet.

Ferrite sintered magnet and rotating electric machine

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 AR(FeCo)O. 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&#x2264;x&#x2264;0.23, 10.80&#x2264;(12&#x2212;y)z&#x2264;12.10, and 0.13&#x2264;yz&#x2264;0.20 are satisfied.

A ferrite sintered magnetcomprises M-type ferrite crystal grainsand multiple-crystal grain boundariessurrounded by three or more of the M-type ferrite crystal grains. The ferrite sintered magnetcontains at least Fe, Ca, B, and Si, and contains 0.005 to 0.9 mass % of B in terms of BO. The multiple-crystal grain boundariescontain Si and Ca, and in a case where the molar ratio of Ca to Si in the multiple-crystal grain boundariesis represented by (Ca/Si), the following formula is satisfied.0.1&#x3c;(Ca/Si)&#x3c;0.9

Ferrite sintered magnet and rotary electrical machine comprising the same

A ferrite sintered magnet comprises a plurality of main phase grains containing a ferrite having a hexagonal structure, wherein at least some of the main phase grains are core-shell structure grains each having a core and a shell covering the core; and wherein the minimum value of the content of La in the core is [La]c atom %; the minimum value of the content of Co in the core is [Co]c atom %; the maximum value of the content of La in the shell is [La]s atom %; the maximum value of the content of Co in the shell is [Co]s atom %; [La]c+[Co]c is 3.08 atom % or more and 4.44 atom % or less; and [La]s+[Co]s is 7.60 atom % or more and 9.89 atom % or less.

Ferrite sintered magnet

A ferrite sintered magnet comprising an M type Sr ferrite having a hexagonal structure as a main phase, wherein the ferrite sintered magnet does not substantially comprise a rare earth element and Co, a content of B is 0.005 to 0.9% by mass in terms of BO, and a content of Zn is 0.01 to 1.2% by mass in terms of ZnO.

Ferrite sintered magnet and rotating electric machine comprising the same

The power information management device is directly or indirectly connected to a communication network and is provided with: wiring that transmits power; a power measurement unit that measures an amount and a direction of the power transmitted through the wiring; a power information generation unit that generates, on a predetermined period basis, power information that represents the amount and the direction of the power measured by the power measurement unit; and a communication unit that transmits the power information to the communication network, wherein a load unit, a power generation unit and a power storage unit are directly or indirectly connectable to the wiring.

Power information management device and power information management system

A ferrite sintered magnet comprising an M type Sr ferrite having a hexagonal structure as a main phase, wherein the ferrite sintered magnet comprises La and Co, a content of B is 0.005 to 0.9% by mass in terms of BO, a content of Zn is 0.01 to 1.2% by mass in terms of ZnO, and the ferrite sintered magnet satisfies [La]/[Zn]&#x2264;0.79 and [Co]/[Zn]&#x2264;0.67 when an atomic concentration of La is represented by [La], an atomic concentration of Co is represented by [Co], and an atomic concentration of Zn is represented by [Zn].

A ferrite sintered magnetcomprises M-type ferrite crystal grainshaving a hexagonal structure, two-crystal grain boundariesformed between two of the M-type ferrite crystal grains, and multiple-crystal grain boundariessurrounded by three or more of the M-type ferrite crystal grains. This ferrite sintered magnetcontains at least Fe, Ca, B, and Si, and contains B in an amount of 0.005 to 0.9 mass % in terms of BO, the two-crystal grain boundariesand the multiple-crystal grain boundariescontain Si and Ca, and in a cross-section parallel to a c-axis of the ferrite sintered magnet, when the number of multiple-crystal grain boundarieshaving a maximum length of 0.49 to 5 &#x3bc;m per cross-sectional area of 76 &#x3bc;mis N, N is 7 or less.

A ferrite sintered magnetcomprises M-type ferrite crystal grainshaving a hexagonal crystal structure, two-crystal grain boundariesformed between two of the M-type ferrite crystal grains, and multiple-crystal grain boundariessurrounded by three or more of the M-type ferrite crystal grains. This ferrite sintered magnetcontains at least Fe, Ca, B, and Si, and contains B in an amount of 0.005 to 0.9 mass % in terms of BO, the two-crystal grain boundariesand the multiple-crystal grain boundariescontain Si and Ca, and in a cross-section parallel to a c-axis of the ferrite sintered magnet, when the number of multiple-crystal grain boundaries having a maximum length of 0.088 or more and less than 0.49 &#x3bc;m per cross-sectional area of 76 &#x3bc;mis P, P is 8 or more.

The present invention provides a ferrite sintered magnet comprising ferrite crystal grains having a hexagonal structure, wherein the ferrite sintered magnet comprises metallic elements at an atomic ratio represented by formula (1). In formula (1), R is at least one element selected from the group consisting of Bi and rare-earth elements, and R comprises at least La. In formula (1), w, x, z and m satisfy formulae (2) to (5). The above-mentioned ferrite sintered magnet further has a coefficient of variation of a size of the crystal grains in a section parallel to a c axis of less than 45%.CaRSrFeCo&#x2003;&#x2003;(1)0.360&#x2264;&#x2264;0.420&#x2003;&#x2003;(2)0.110&#x2264;&#x2264;0.173&#x2003;&#x2003;(3)8.51&#x2264;&#x2264;9.71&#x2003;&#x2003;(4)0.208&#x2264;&#x2264;0.269&#x2003;&#x2003;(5)

A ferrite sintered magnet including ferrite grains having a hexagonal crystal structure. The ferrite grains satisfy 0.56&#x2264;W&#x2264;0.68 where W is an average value of circularities of the ferrite grains in a cross section parallel to an axis of easy magnetization.

There is provided a ferrite sintered magnet having a high residual magnetic flux density. A ferrite sintered magnetincludes a plurality of main phase particlesincluding ferrite having a hexagonal structure, the number of core-shell structured particlesA having a coreand a shellcovering the core, among the main phase particles, is smaller than the number of the main phase particlesother than the core-shell structured particlesA.

This ferrite sintered magnet comprises metallic elements at an atomic ratio represented by formula (1):CaRSrFeCo&#x2003;&#x2003;(1)

The present invention provides a ferrite sintered magnet comprising (1) main phase grains containing a ferrite having a hexagonal structure, (2) two-grain boundaries formed between two of the main phase grains, and (3) multi-grain boundaries surrounded by three or more of the main phase grains. The above ferrite sintered magnet comprises Ca, R, Sr, Fe and Co, with R being at least one element selected from the group consisting of rare earth elements and Bi, and comprising at least La. The number Nm of the above main phase grains and the number Ng of the above multi-grain boundaries in the cross section including the direction of the easy magnetization axis of the above ferrite sintered magnet satisfy the formula (1A):50%&#x2264;/()&#x2264;65%&#x2003;&#x2003;(1A).

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Tokyo, Japan

Hiroyuki Morita