公开(公告)号：US10984941B2

公开(公告)日：2021-04-20

申请号：US15968036

申请日：2018-05-01

申请人： TDK CORPORATION

发明人： Yasuhide Yamashita ,  Katsushi Yasuhara ,  Chiomi Sato ,  Syota Goto

IPC分类号： H01F27/255 ,  H01F17/00 ,  B29C43/18 ,  H01F27/02 ,  H01F41/04 ,  B29C43/14 ,  H01F17/04 ,  H01F1/36 ,  B29L31/34 ,  B29K705/00

摘要： An inductor element includes a wire-winding portion and a core portion. In the wire-winding portion, a conductor is wound in a coil shape. The core portion surrounds the wire-winding portion and contains a magnetic powder and a resin. An inner-core central region is a region of the core portion within a distance from a winding axis center of the wire-winding portion toward an existing region of the wire-winding portion in an outward direction perpendicular to the winding axis center. A top-plate central region is a region of the core portion within a distance from the winding axis center toward a no-existing region of the wire-winding portion in the outward direction. Sα−Sβ≥−2% is satisfied, where Sα (%) and Sβ (%) are respectively an area ratio of the magnetic powder in the inner-core central region and the top-plate central region.

公开(公告)号：US10991493B2

公开(公告)日：2021-04-27

申请号：US15560907

申请日：2016-03-25

申请人： TDK CORPORATION

发明人： Wakako Okawa ,  Syota Goto ,  Yoshinori Fujikawa

IPC分类号： H01F1/053 ,  H01F1/057 ,  C22C38/00 ,  H01F1/08 ,  C22C38/02 ,  C22C38/06 ,  C22C38/10 ,  C22C38/16 ,  B22F3/16 ,  B22F3/24 ,  B22F9/04 ,  C22C28/00 ,  C22C30/00 ,  B22F3/00

摘要： A rare earth magnet includes main phase grains having an R2T14B type crystal structure. The main phase grains include Ga. A concentration ratio A (A=αGa/βGa) of the main phase grains is 1.20 or more, where αGa and βGa are respectively a highest concentration of Ga and a lowest concentration of Ga in one main phase grain.

公开(公告)号：US10854365B2

公开(公告)日：2020-12-01

申请号：US15904844

申请日：2018-02-26

申请人： TDK CORPORATION

发明人： Kazuhiro Yoshidome ,  Hiroyuki Matsumoto ,  Kenji Horino ,  Akito Hasegawa ,  Yu Yonezawa ,  Syota Goto ,  Seigo Tokoro

IPC分类号： C22C45/02 ,  H01F1/153

摘要： Provided is a soft magnetic alloy including Fe, as a main component, and including B. Among 80000 pieces of a grid having 1 nm×1 nm×1 nm in a continuous measurement range of the soft magnetic alloy, 4000 pieces of the grid from lower Fe content shows B content variation (σB) of 2.8 or more, and an amorphization ratio X of the soft magnetic alloy of 85% or more.

公开(公告)号：US10726980B2

公开(公告)日：2020-07-28

申请号：US15560795

申请日：2016-03-25

申请人： TDK CORPORATION

发明人： Wakako Okawa ,  Syota Goto ,  Yoshinori Fujikawa

IPC分类号： H01F1/057 ,  H01F1/053 ,  C22C38/00 ,  H01F1/08 ,  C22C38/02 ,  C22C38/06 ,  C22C38/10 ,  C22C38/16 ,  B22F3/16 ,  B22F3/24 ,  B22F9/04 ,  C22C28/00 ,  C22C30/00 ,  B22F3/00

摘要： A rare earth magnet includes main phase grains having an R2T14B type crystal structure. The main phase grains include B. A concentration ratio A (A=αB/βB) of the main phase grains is 1.05 or more, where αB and βB are respectively a highest concentration of B and a lowest concentration of B in one main phase grain.

公开(公告)号：US10541072B2

公开(公告)日：2020-01-21

申请号：US15718757

申请日：2017-09-28

申请人： TDK CORPORATION

发明人： Kazuhiro Yoshidome ,  Hiroyuki Matsumoto ,  Yu Yonezawa ,  Syota Goto ,  Hideaki Yokota ,  Akito Hasegawa ,  Masahito Koeda ,  Seigo Tokoro

IPC分类号： H01F1/147 ,  C22C38/02 ,  C22C38/12 ,  C22C38/16

摘要： A soft magnetic alloy includes a main component of Fe. The soft magnetic alloy includes a Fe composition network phase where regions whose Fe content is larger than an average composition of the soft magnetic alloy are linked. The Fe composition network phase contains Fe content maximum points that are locally higher than their surroundings. A virtual-line total distance per 1 μm3 of the soft magnetic alloy is 10 mm to 25 mm provided that the virtual-line total distance is a sum of virtual lines linking the maximum points adjacent each other. A virtual-line average distance that is an average distance of the virtual lines is 6 nm or more and 12 nm or less.

公开(公告)号：US11189408B2

公开(公告)日：2021-11-30

申请号：US15904986

申请日：2018-02-26

申请人： TDK CORPORATION

发明人： Kazuhiro Yoshidome ,  Hiroyuki Matsumoto ,  Kenji Horino ,  Akito Hasegawa ,  Yu Yonezawa ,  Syota Goto ,  Seigo Tokoro

IPC分类号： H01F1/153 ,  C22C45/02 ,  C22C38/20 ,  C22C33/00 ,  C22C38/04 ,  C22C38/02 ,  H01F41/02 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16

摘要： Provided is a soft magnetic alloy including Fe as a main component, in which a slope of an approximate straight line, plotted between cumulative frequencies of 20 to 80% on Fe content in each grid of 80000 grids or more, each of which has 1 nm×1 nm×1 nm, is −0.1 to −0.4, provided that Fe content (atom %) of each grid is Y axis, and the cumulative frequencies (%) obtained in descending order of Fe content in each grid is X axis, and an amorphization ratio X is 85% or more.

公开(公告)号：US10984929B2

公开(公告)日：2021-04-20

申请号：US15560695

申请日：2016-03-25

申请人： TDK CORPORATION

发明人： Wakako Okawa ,  Syota Goto ,  Yoshinori Fujikawa

IPC分类号： H01F1/057 ,  H01F41/02 ,  C22C38/00 ,  H01F1/08 ,  C22C38/02 ,  C22C38/06 ,  C22C38/10 ,  C22C38/16 ,  B22F3/16 ,  B22F3/24 ,  B22F9/04 ,  C22C28/00 ,  C22C30/00 ,  B22F3/00

摘要： A rare earth magnet includes main phase grains having an R2T14B type crystal structure. The main phase grains include C. A concentration ratio A1 (A1=αC/βC) of the main phase grains is 1.50 or more, where αC and βC are respectively a highest concentration of C and a lowest concentration of C in one main phase grain.

公开(公告)号：US10943718B2

公开(公告)日：2021-03-09

申请号：US15905027

申请日：2018-02-26

申请人： TDK CORPORATION

发明人： Kazuhiro Yoshidome ,  Hiroyuki Matsumoto ,  Kenji Horino ,  Akito Hasegawa ,  Yu Yonezawa ,  Syota Goto ,  Hajime Amano

IPC分类号： H01F1/153 ,  C22C45/02 ,  C22C38/16 ,  C22C33/00 ,  C22C38/18 ,  C22C38/02 ,  C22C38/00 ,  C22C38/12 ,  C22C33/04 ,  H01F41/02

摘要： Provided is a soft magnetic alloy including Fe, as a main component, and including C. the soft magnetic alloy includes an Fe composite network phase having Fe-rich grids connected in a continuous measurement range including 80000 grids, each of which size is 1 nm×1 nm×1 nm. An average of C content ratio of the Fe-poor grids having cumulative frequency of 90% or more from lower C content is 5.0 times or more to an average of C content ratio of the whole soft magnetic alloy.

公开(公告)号：US10242777B2

公开(公告)日：2019-03-26

申请号：US15420151

申请日：2017-01-31

申请人： TDK Corporation

发明人： Makoto Iwasaki ,  Tetsuya Hidaka ,  Takuma Hayakawa ,  Ayato Kakoki ,  Yoshinori Fujikawa ,  Syota Goto ,  Haruna Nakajima ,  Takeshi Masuda ,  Chikara Ishizaka

IPC分类号： H01F1/055 ,  B22F1/00 ,  B22F3/10 ,  B22F9/02 ,  C22C38/00 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  H01F1/057 ,  H01F41/02 ,  B22F9/04 ,  C22C33/02

摘要： Provided is a sintered magnet that is an R-T-B based sintered magnet having a region having a concentration of at least one heavy rare earth element decreasing from the surface toward the inside, in which the at least one heavy rare earth element includes at least either of Tb or Dy, R includes Nd, T includes Fe, Co, and Cu, there is a grain boundary phase containing at least either of Tb or Dy and Nd between two main phase particles, and a value obtained by subtracting a half value width of a concentration distribution curve of Cu from a half value width of a concentration distribution curve of Tb or Dy in a part including the grain boundary phase is from 10 to 20 nm.