公开(公告)号：US20170076846A1

公开(公告)日：2017-03-16

申请号：US15258589

申请日：2016-09-07

Applicant: TDK CORPORATION

Inventor： Naoto TSUKAMOTO ,  Hiroshi MIYASAKA ,  Makoto IWASAKI ,  Takahiro KAWASHIMA ,  Chikara ISHIZAKA

IPC: H01F7/02 ,  H02K1/02

Abstract: An R-T-B based sintered magnet includes a first main surface and a first side surface. The first main surface has a coercivity that is higher than that of the first side surface. ΔHcjM≦60 kA/m is satisfied, where ΔHcjM is a difference in coercivity between a portion having a highest coercivity on the first main surface and a portion having a lowest coercivity on the first main surface. ΔHcjG≦60 kA/m is satisfied, where ΔHcjG is a difference in coercivity between a portion having a highest coercivity on a first cross section and a portion having a lowest coercivity on the first cross section and the first cross section is a cross section parallel to the first main surface and spaced from the first main surface at a predetermined length or more.

Abstract translation: R-T-B系烧结磁体包括第一主表面和第一侧表面。 第一主表面的矫顽力高于第一侧表面的矫顽力。 ΔHcjM≤60kA/ m，其中ΔHcjM是第一主表面具有最高矫顽力的部分与第一主表面具有最低矫顽力的部分之间的矫顽力差。 ΔHcjG≤60kA/ m，其中ΔHcjG是在第一横截面上具有最高矫顽力的部分与第一横截面具有最低矫顽力的部分之间的矫顽力的差异与第一横截面是横截面平行 到第一主表面并且以预定长度或更长的距离与第一主表面间隔开。

公开(公告)号：US20240145151A1

公开(公告)日：2024-05-02

申请号：US18498131

申请日：2023-10-31

Applicant: TDK CORPORATION

Inventor： Masayoshi SHIMAZAKI ,  Osamu OHHATA ,  Naoto TSUKAMOTO ,  Sena YOSHINO ,  Nobuo KITAJIMA ,  Masashi GOTOH

IPC: H01F17/04 ,  H01F27/24 ,  H01F27/28

CPC classification number: H01F17/04 ,  H01F27/24 ,  H01F27/2823

Abstract: Provided is a coil component including a core member and a wire wound around the core member, wherein a cross section of the core member perpendicular to a winding axis of the wire wound around the core member has a circumference shape comprising at least three first arcs and connecting lines connecting the at least three first arcs adjacent to each other, and each of the at least three first arcs has a predetermined radius and a predetermined central angle for closely contacting the wire and the core member.

公开(公告)号：US20170103835A1

公开(公告)日：2017-04-13

申请号：US15285178

申请日：2016-10-04

Applicant: TDK CORPORATION

Inventor： Tetsuya HIDAKA ,  Takuma HAYAKAWA ,  Makoto IWASAKI ,  Ayato KAKOKI ,  Naoto TSUKAMOTO ,  Fumitaka BABA

IPC: H01F1/053 ,  C22C28/00

Abstract: An R-T-B based sintered magnet includes “R”, “T”, and “B”. “R” represents a rare earth element including at least Tb. “T” represents a metal element except rare earth elements including at least Fe, Cu, Mn, Al, and Co. “B” represents boron or boron and carbon. With respect to 100 mass % of a total mass of the R-T-B based sintered magnet, a content of “R” is 28.0 to 32.0 mass %, a content of Cu is 0.04 to 0.50 mass %, a content of Mn is 0.02 to 0.10 mass %, a content of Al is 0.15 to 0.30 mass %, a content of Co is 0.50 to 3.0 mass %, and a content of “B” is 0.85 to 1.0 mass %. Tb2/Tb1 is 0.40 to less than 1.0, where Tb1 and Tb2 (mass %) denote a content of Tb at a surface portion and at a core portion, respectively.

公开(公告)号：US20240177915A1

公开(公告)日：2024-05-30

申请号：US18523018

申请日：2023-11-29

Applicant: TDK CORPORATION

Inventor： Naoto TSUKAMOTO ,  Satoru KUROKAWA ,  Tomohiko AIDA ,  Masashi GOTOH ,  Hirofumi SASAKI ,  Ryuji ANDO

IPC: H01F27/255 ,  H01F27/29 ,  H01F41/02

CPC classification number: H01F27/255 ,  H01F27/292 ,  H01F41/0246

Abstract: A coil component includes an exterior body, a coil positioned inside the exterior body, and terminal electrodes arranged on a surface of the exterior body and connected to lead parts of the coil. The exterior body is a columnar shape or a polyhedron shape, and includes a first plane for arranging the terminal electrodes, a second plane opposing the first plane, and one or more connecting planes connecting the first plane and the second plane; and the exterior body has a jagged edge on at least part of an edge positioned between the second plane and the one or more connecting planes.

公开(公告)号：US20230245812A1

公开(公告)日：2023-08-03

申请号：US18161332

申请日：2023-01-30

Applicant: TDK CORPORATION

Inventor： Naoto TSUKAMOTO ,  Sena YOSHINO ,  Tomohiko AIDA ,  Shigeki YANAGIDA ,  Masashi GOTOH ,  Hirofumi SASAKI ,  Hitoshi SASAKI

IPC: H01F27/255 ,  H01F41/02 ,  H01F27/28 ,  H01F27/30

CPC classification number: H01F27/255 ,  H01F41/0246 ,  H01F27/2823 ,  H01F27/306

Abstract: A coil device 1 comprises a coil 10, a T-shaped core 20 including a columnar portion 21 around which the coil 10 is disposed and a flange 22 formed at a first end 21a of the columnar portion 21 in an axial direction thereof, and an exterior body 30 covering the coil 10 and the columnar portion 21 and made of an exterior material including magnetic particles and a resin. The core 20 is provided with a recess 40 including at least one of a first recess 41 or a second recess 42. The first recess 41 extends between the first end 21a and a second end 21b of the columnar portion 21 in the axial direction. The second recess 42 extends from an inner side towards an outer side of the flange 22.