公开(公告)号：US11335484B2

公开(公告)日：2022-05-17

申请号：US16965905

申请日：2019-01-29

Applicant: TDK CORPORATION

Inventor： Masaki Tomita ,  Ryuji Hashimoto ,  Takashi Watanabe

IPC: H01F1/059

Abstract: A permanent magnet including R and T. R are rare earth elements including Sm and at least one selected from Y and Gd. T is Fe alone or Fe and Co. T maybe partly substituted with M, and M is one or more selected from Ti, V, Cr, Mo, W, Zr, Hf, Nb, Ta, Al, Si, Cu, Zn, Ga and Ge. In a total content of R, Sm content is 60 at % or more and 95 at % or less, and a total content of Y and Gd is 5 at % or more and 35 at % or less. The permanent magnet includes main phase crystal grains having a ThMn12 type crystal structure.

公开(公告)号：US11302465B2

公开(公告)日：2022-04-12

申请号：US16465412

申请日：2017-11-30

Applicant: TDK CORPORATION

Inventor： Ryuji Hashimoto ,  Masashi Ito ,  Eiichiro Fukuchi ,  Yuki Nagamine

IPC: H01F1/057 ,  C22C38/10

Abstract: To provide a rare earth permanent magnet having as a main phase a compound with a Nd5Fe17 crystalline structure having strong coercive force. A rare earth permanent magnet having as a main phase a compound with a Nd5Fe17 crystalline structure, wherein when the composition ratio of the rare earth permanent magnet is expressed as RaT(100-a-b)Cb, where R is one or more rare earth elements requiring Sm, and T is one or more transition metal elements requiring Fe or Fe and Co, a and b satisfy 18

公开(公告)号：US20240312684A1

公开(公告)日：2024-09-19

申请号：US18404404

申请日：2024-01-04

Applicant: TDK Corporation

Inventor： Ryuji Hashimoto ,  Nobuyuki Okuzawa ,  Yuta Takahashi ,  Hiroki Hosaka ,  Munehiro Takaku ,  Shinnosuke Suzuki

IPC: H01F5/06 ,  H01F5/04

CPC classification number: H01F5/06 ,  H01F5/04

Abstract: A coil component includes an element body formed by stacking a plurality of insulating layers and including a principal surface and a principal surface, a first terminal electrode and a second terminal electrode disposed on the principal surface of the element body, and a coil disposed in the element body and electrically connected to the first terminal electrode and the second terminal electrode. The coil includes a first wiring portion disposed on the principal surface side, a second wiring portion disposed on the principal surface side, and a pillar portion extending in the second direction and connecting the first wiring portion and the second wiring portion. In the pillar portion, a filler is disposed on a contact surface in which two conductors come into contact with each other.

公开(公告)号：US11081265B2

公开(公告)日：2021-08-03

申请号：US16465402

申请日：2017-11-30

Applicant: TDK CORPORATION

Inventor： Takurou Iwasa ,  Ryuji Hashimoto ,  Masashi Ito

IPC: H01F1/055 ,  C22C33/02 ,  C22C38/00 ,  C22C38/10 ,  H01F1/053

Abstract: A rare-earth sintered magnet contains main phase crystal grains having an Nd5Fe17-type crystal structure, includes R and T (where R represents one or more rare-earth elements that essentially include Sm and T represents Fe or one or more transition metal elements that essentially include Fe and Co), and wherein the compositional ratio of R is 20-40 at % and the remaining portion is substantially T; the remaining portion other than R is substantially only T or only T and C; and when the main phase crystal grains' average grain size in one cross-sectional surface of the rare-earth sintered magnet is defined as Dv, while grain size of individual main phase crystal grains is defined as Di, Dv is at least 1.0 μm, and the main phase crystal grains' area ratio that satisfy 0.7Dv≤Di≤2.0Dv is at least 80% with respect to the area of a cross-sectional surface of the rare-earth sintered magnet.

公开(公告)号：US10020102B2

公开(公告)日：2018-07-10

申请号：US14689862

申请日：2015-04-17

Applicant: TDK CORPORATION

Inventor： Ryuji Hashimoto ,  Yasushi Enokido ,  Kenichi Nishikawa

IPC: H02K1/02 ,  H01F1/34 ,  C22C38/00 ,  H01F1/057 ,  C22C33/02

CPC classification number: H01F1/34 ,  C22C33/0278 ,  C22C38/005 ,  C22C2202/02 ,  H01F1/0577

Abstract: The present invention provides an R-T-B based permanent magnet suitable as a magnet with a variable magnetic force for a motor with variable magnetic flux, which has a high residual magnetic flux density, a low coercivity, and a magnetic force that can be reversibly varied by a small external magnetic field. A permanent magnet with a high residual magnetic flux density and a low coercivity that is suitable as a variable magnet for a motor with variable magnetic flux can be obtained, by selecting the rare earth elements consisting of one or more of Y, La and Ce for a predetermined amount of the rare earth element(s) R in the R-T-B based permanent magnet, and further adding a predetermined amount of the additive element(s) which is at least one of Al, Cu, Zr, Hf and Ti.

公开(公告)号：US09490053B2

公开(公告)日：2016-11-08

申请号：US14385921

申请日：2014-02-12

Applicant: TDK CORPORATION

Inventor： Kenichi Suzuki ,  Kyung-Ku Choi ,  Ryuji Hashimoto

IPC: H01F1/057 ,  C22C38/00

CPC classification number: H01F1/057 ,  C22C38/002 ,  C22C38/005 ,  H01F1/0577

Abstract: A R-T-B based permanent magnet which not only has equivalent magnetic properties as the existing Nd—Fe—B based permanent magnet but also has a high adhesive strength and which can be suitably used as a magnet for field system of a permanent magnet synchronous rotating machine. The magnet can be obtained in a case where the composition of the compound for forming the main phase is (R1-x(Ce1-zYz)x)2T14B (R is rare earth element(s) consisting of one or more elements selected from La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, T is one or more transition metal elements with Fe or Fe and Co as essential element(s), 0.0

Abstract translation: 一种R-T-B系永磁体，其不仅具有与现有的Nd-Fe-B系永久磁铁等效的磁特性，而且还具有高的粘合强度，并且可以适用于永磁同步旋转机的磁场系统的磁体。 在用于形成主相的化合物的组成为（R1-x（Ce1-zYz）x）2T14B（R是由选自La的一种或多种元素组成的稀土元素的情况下，可以获得磁体） ，Pr，Nd，Sm，Eu，Gd，Tb，Dy，Ho，Er，Tm，Yb和Lu，T是一种或多种具有Fe或Fe和Co作为必需元素的过渡金属元素，0.0

公开(公告)号：US09396852B2

公开(公告)日：2016-07-19

申请号：US14261516

申请日：2014-04-25

Applicant: TDK CORPORATION

Inventor： Ryuji Hashimoto ,  Kenichi Suzuki ,  Kyung-ku Choi

IPC: H01F1/057 ,  H01F10/12

CPC classification number: H01F1/057 ,  H01F10/126

Abstract: The present invention provides such a permanent magnet that its magnetic properties will not significantly decrease and it can be prepared at a lower temperature, compared to conventional R-T-B based permanent magnets. In the R-T-B based structure, a stacked structure of R1-T-B based crystal layer and Ce-T-B based crystal layer can be formed by alternatively stacking the R1-T-B based crystal layer and the Ce-T-B based crystal layer. In this way, a high magnetic anisotropy field of the R1-T-B based crystal layer can be maintained while the crystallization temperature can be lowered by the Ce-T-B based crystal layer.

Abstract translation: 本发明提供这样的永磁体，其磁性能不会显着降低，并且与常规的R-T-B基永磁体相比可以在较低的温度下制备。 在基于R-T-B的结构中，可以通过交替堆叠R1-T-B基晶体层和Ce-T-B基晶体层来形成R1-T-B基晶体层和Ce-T-B基晶体层的堆叠结构。 以这种方式，可以通过Ce-T-B类结晶层降低结晶温度，从而保持R1-T-B系晶体层的高磁各向异性场。

公开(公告)号：US09082537B2

公开(公告)日：2015-07-14

申请号：US14262156

申请日：2014-04-25

Applicant: TDK CORPORATION

Inventor： Ryuji Hashimoto ,  Kenichi Suzuki ,  Kyung-ku Choi ,  Kenichi Nishikawa

IPC: H01F1/057 ,  H01F10/12

CPC classification number: H01F1/057 ,  H01F10/126

Abstract: The present invention provides a permanent magnet which is excellent in the temperature properties and the magnetic properties of which will not be significantly decreased, compared to the conventional R-T-B based permanent magnet. In the R-T-B based structure, a stacked structure of R1-T-B based crystal layer and Y-T-B based crystal layer can be formed by alternatively stacking R1-T-B and Y-T-B. In this way, a high magnetic anisotropy field of the R1-T-B based crystal layer can be maintained while the temperature coefficient of the Y-T-B based crystal layer can be improved.

Abstract translation: 本发明提供一种与常规的R-T-B系永磁体相比，其温度特性优异，磁特性不会显着降低的永磁体。 在基于R-T-B的结构中，可以通过交替地堆叠R1-T-B和Y-T-B来形成R1-T-B基晶体层和Y-T-B基晶体层的堆叠结构。 以这种方式，可以保持R1-T-B基晶体层的高磁各向异性场，同时可以提高Y-T-B系晶体层的温度系数。

公开(公告)号：US09953751B2

公开(公告)日：2018-04-24

申请号：US14385855

申请日：2014-02-12

Applicant: TDK CORPORATION

Inventor： Kenichi Suzuki ,  Yuji Umeda ,  Ryuji Hashimoto

IPC: H01F1/057 ,  H02K21/02

CPC classification number: H01F1/0577 ,  H02K21/02

Abstract: A R-T-B based permanent magnet which not only has equivalent magnetic properties as the existing Nd—Fe—B based permanent magnet as well as light mass but also can be suitably used as a magnet for field system of a permanent magnet synchronous rotating machine. The magnet can be obtained in a case where the composition of the compound for forming the main phase is (R1-x(Y1-zLaz)x)2T14B (R is rare earth element(s) consisting of one or more elements of Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, T is one or more transition metal elements with Fe or Fe and Co as essential elements, 0.0

公开(公告)号：US09702945B2

公开(公告)日：2017-07-11

申请号：US14374640

申请日：2012-12-13

Applicant: TDK CORPORATION

Inventor： Kenichi Suzuki ,  Tsutomu Chikamatsu ,  Akio Ogawa ,  Kyung-ku Choi ,  Ryuji Hashimoto

IPC: G01R33/12 ,  G01R33/10

CPC classification number: G01R33/12 ,  G01R33/10 ,  G01R33/1215

Abstract: A magnetic measurement device which can measure the magnetic characteristics in a microregion of a thin plate magnetic sample. After a magnetic sample is applied by a magnetic field and magnetized accordingly, by scanning the magnetic sample using a measuring part, the magnetic flux leakage in the magnetic sample can be measured. The magnetic flux leaks outside by magnetizing a first region and a second region of the magnetic sample in reciprocally opposite directions and reducing the demagnetizing field. Specifically, a magnetic field generating part with at least a pair of magnetic poles is used to perform the magnetization of multiple poles, or the magnetic field generating part applies a damped oscillation magnetic field to perform the magnetization, or a local magnetic field generating part which applies an alternating magnetic field and scans the surface of the sample at the same time is used to perform the magnetization.