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    Rare earth based magnet
    2.
    发明授权
    Rare earth based magnet 有权

    公开(公告)号：US10109402B2

    公开(公告)日：2018-10-23

    申请号：US14332808

    申请日：2014-07-16

    Applicant: TDK CORPORATION

    Inventor： Eiji Kato ,  Yoshinori Fujikawa ,  Taeko Tsubokura ,  Chikara Ishizaka ,  Katsuo Sato

    IPC: H01F1/057 ,  H01F1/055 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/16

    Abstract: The present invention provides a rare earth based magnet that inhibits the high temperature demagnetization rate even when less or no heavy rare earth elements such as Dy, Tb and the like than before are used. The rare earth based magnet according to the present invention is a sintered magnet which includes R2T14B crystal grains as main phase and grain boundary phases between the R2T14B crystal grains. When the grain boundary phase surrounded by three or more main phase crystal grains is regarded as the grain boundary multi-point, the microstructure of the sintered body is controlled so that the ratio of the grain boundary triple-point surrounded by three main phase crystal grains in all grain boundary multi-points to be specified value or less.

    Motor
    4.
    发明授权
    Motor 有权

    公开(公告)号：US10530232B2

    公开(公告)日：2020-01-07

    申请号：US15607993

    申请日：2017-05-30

    Applicant: TDK CORPORATION

    Inventor： Eiji Kato ,  Makoto Iwasaki

    IPC: H02K41/03 ,  H02K1/02 ,  H02K1/27 ,  H02K1/16

    Abstract: A motor includes a magnet and a coil. α2=[{(Br2−Br1)/Br1}/(T2−T1)]×100≥0.11 and α3=[{(Br3−Br1)/Br1}/(T3−T1)]×100≤0.13 are satisfied. In the magnet, Br1 (mT) is a residual magnetic flux density at T1 (° C.), Br2 (mT) is a residual magnetic flux density at T2 (° C.), and Br3 (mT) is a residual magnetic flux density at T3 (° C.), and α2 (%/° C.) is a temperature coefficient at a target temperature of T2 (° C.) with respect to a reference temperature of T1 (° C.), and α3 (%/° C.) is a temperature coefficient at a target temperature of T3 (° C.) with respect to a reference temperature of T1 (° C.) in conditions of T1=20, T2=100, and T3=220.

    Rare earth based magnet
    5.
    发明授权
    Rare earth based magnet 有权

    公开(公告)号：US10020099B2

    公开(公告)日：2018-07-10

    申请号：US14332666

    申请日：2014-07-16

    Applicant: TDK CORPORATION

    Inventor： Eiji Kato ,  Yoshinori Fujikawa ,  Taeko Tsubokura ,  Chikara Ishizaka ,  Katsuo Sato

    IPC: H01F1/057 ,  C22C38/00 ,  H01F1/053 ,  H01F1/08

    CPC classification number: H01F1/0577 ,  C22C38/002 ,  C22C38/005 ,  H01F1/0536 ,  H01F1/086

    Abstract: The present invention provides a rare earth based magnet that inhibits the high temperature demagnetization rate even when less or no heavy rare earth elements such as Dy, Tb and the like than before are used. The rare earth based magnet according to the present invention is a sintered magnet which includes R2T14B crystal grains as main phase and grain boundary phases between the R2T14B crystal grains. when evaluating the cross-sectional area distribution of the main phase crystal grains by histogram in any cross-section of the rare earth based magnet, the crystal grains with large particle size and the crystal grains with small particle size are controlled so that the cross-sectional area distribution becomes the one which respectively has at least one peak at two sides of the average value of the cross-sectional area.

    R-T-B BASED SINTERED MAGNET AND PRODUCTION METHOD FOR SAME, AND ROTARY MACHINE
    8.
    发明申请
    R-T-B BASED SINTERED MAGNET AND PRODUCTION METHOD FOR SAME, AND ROTARY MACHINE 有权
    R-T-B型烧结磁铁及其生产方法及旋转机

    公开(公告)号：US20140286816A1

    公开(公告)日：2014-09-25

    申请号：US14351199

    申请日：2012-10-11

    Applicant: TDK CORPORATION

    Inventor： Eiji Kato ,  Chikara Ishizaka ,  Taeko Tsubokura ,  Tamotsu Ishiyama ,  Nobuhiro Jingu

    IPC: H01F1/053 ,  H01F41/02

    CPC classification number: H01F1/053 ,  B22D11/0611 ,  C22C33/02 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  C22C2202/02 ,  H01F1/0536 ,  H01F1/0571 ,  H01F1/0577 ,  H01F1/086 ,  H01F41/0266

    Abstract: An R-T-B sintered magnet including a composition containing a rare earth element, a transition element and boron, containing essentially no dysprosium as a rare earth element, and having crystal grains with a composition containing a rare earth element, a transition element and boron, and grain boundary regions formed between the crystal grains, wherein the triple point regions which are grain boundary regions surrounded by 3 or more crystal grains have a composition containing a rare earth element, a transition element and boron and have a higher mass ratio of the rare earth element than the crystal grains, the average value of the area of the triple point regions in a cross-section being no greater than 2 μm2 and the standard deviation of the area distribution being no greater than 3.

    Abstract translation: 一种RTB烧结磁体，其包含含有稀土元素，过渡元素和硼的组合物，所述组合物基本上不含作为稀土元素的镝，并且具有含有稀土元素，过渡元素和硼的组成的晶粒和晶粒 形成在晶粒之间的边界区域，其中由3个或更多个晶粒包围的晶界区域的三重点区域具有包含稀土元素，过渡元素和硼的组成，并且稀土元素的质量比较高 晶界的三点区域的面积的平均值不大于2μm2，面积分布的标准偏差不大于3。

    R-T-B SINTERED MAGNET AND METHOD FOR PRODUCTION THEREOF, AND ROTARY MACHINE
    9.
    发明申请
    R-T-B SINTERED MAGNET AND METHOD FOR PRODUCTION THEREOF, AND ROTARY MACHINE 审中-公开
    R-T-B烧结磁铁及其制造方法及旋转机

    公开(公告)号：US20140247100A1

    公开(公告)日：2014-09-04

    申请号：US14350728

    申请日：2012-10-11

    Applicant: TDK CORPORATION

    Inventor： Taeko Tsubokura ,  Chikara Ishizaka ,  Eiji Kato ,  Tamotsu Ishiyama ,  Nobuhiro Jingu

    IPC: H01F1/057 ,  H01F41/02

    CPC classification number: H01F1/053 ,  B22D11/0611 ,  C22C33/02 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  C22C2202/02 ,  H01F1/0536 ,  H01F1/0571 ,  H01F1/0577 ,  H01F1/086 ,  H01F41/0266

    Abstract: An R-T-B sintered magnet 100 including particles containing an R2T14B phase, obtained using an R-T-B alloy strip containing crystal grains of an R2T14B phase, wherein the R-T-B alloy strip has, in a cross-section along the thickness direction, the crystal grains extending in a radial fashion from the crystal nuclei, the following inequality (1) being satisfied, where the average value of the lengths of the crystal grains on one side in the direction perpendicular to the thickness direction and the average value of the lengths on the other side opposite the one side are represented as D1 and D2, respectively, the mean particle diameter of the particles is 0.5 to 5 μm, and essentially no heavy rare earth elements are present. 0.9≦D2/D1≦1.1  (1)

    Abstract translation: 一种RTB烧结磁体100，其包含使用含有R2T14B相的晶粒的RTB合金带获得的包含R2T14B相的颗粒，其中，所述R​​TB合金带在沿着厚度方向的横截面中具有沿径向延伸的晶粒 从晶核的方式，满足以下不等式（1），其中在与厚度方向垂直的方向上的一侧上的晶粒的长度的平均值和在与厚度方向相反的另一侧上的长度的平均值 一侧分别表示为D1和D2，颗粒的平均粒径为0.5〜5μm，基本上不存在重稀土元素。 0.9＆nlE; D2 / D1＆nlE; 1.1（1）

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