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1. 发明授权

US11335484B2 Permanent magnet 有权
公开(公告)号：US11335484B2
公开(公告)日：2022-05-17
申请号：US16965905
申请日：2019-01-29
申请人： TDK CORPORATION
发明人： Masaki Tomita , Ryuji Hashimoto , Takashi Watanabe
IPC分类号： H01F1/059
摘要： 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.

2. 发明授权

US11302465B2 Rare-earth permanent magnet 有权
公开(公告)号：US11302465B2
公开(公告)日：2022-04-12
申请号：US16465412
申请日：2017-11-30
申请人： TDK CORPORATION
发明人： Ryuji Hashimoto , Masashi Ito , Eiichiro Fukuchi , Yuki Nagamine
IPC分类号： H01F1/057 , C22C38/10
摘要： 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

3. 发明授权

US11081265B2 Rare-earth sintered magnet 有权
公开(公告)号：US11081265B2
公开(公告)日：2021-08-03
申请号：US16465402
申请日：2017-11-30
申请人： TDK CORPORATION
发明人： Takurou Iwasa , Ryuji Hashimoto , Masashi Ito
IPC分类号： H01F1/055 , C22C33/02 , C22C38/00 , C22C38/10 , H01F1/053
摘要： 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.

4. 发明授权

US10020102B2 R-T-B based permanent magnet and rotating machine 有权
公开(公告)号：US10020102B2
公开(公告)日：2018-07-10
申请号：US14689862
申请日：2015-04-17
申请人： TDK CORPORATION
发明人： Ryuji Hashimoto , Yasushi Enokido , Kenichi Nishikawa
IPC分类号： H02K1/02 , H01F1/34 , C22C38/00 , H01F1/057 , C22C33/02
CPC分类号： H01F1/34 , C22C33/0278 , C22C38/005 , C22C2202/02 , H01F1/0577
摘要： 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.

5. 发明授权

US09490053B2 R-T-B based permanent magnet 有权
标题翻译： R-T-B型永久磁铁
公开(公告)号：US09490053B2
公开(公告)日：2016-11-08
申请号：US14385921
申请日：2014-02-12
申请人： TDK CORPORATION
发明人： Kenichi Suzuki , Kyung-Ku Choi , Ryuji Hashimoto
IPC分类号： H01F1/057 , C22C38/00
CPC分类号： H01F1/057 , C22C38/002 , C22C38/005 , H01F1/0577
摘要： 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
摘要翻译：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

6. 发明授权

US09396852B2 R-T-B based permanent magnet 有权
标题翻译： R-T-B型永久磁铁
公开(公告)号：US09396852B2
公开(公告)日：2016-07-19
申请号：US14261516
申请日：2014-04-25
申请人： TDK CORPORATION
发明人： Ryuji Hashimoto , Kenichi Suzuki , Kyung-ku Choi
IPC分类号： H01F1/057 , H01F10/12
CPC分类号： H01F1/057 , H01F10/126
摘要： 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.
摘要翻译：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。

7. 发明授权

US09082537B2 R-T-B based permanent magnet 有权
标题翻译： R-T-B型永久磁铁
公开(公告)号：US09082537B2
公开(公告)日：2015-07-14
申请号：US14262156
申请日：2014-04-25
申请人： TDK CORPORATION
发明人： Ryuji Hashimoto , Kenichi Suzuki , Kyung-ku Choi , Kenichi Nishikawa
IPC分类号： H01F1/057 , H01F10/12
CPC分类号： H01F1/057 , H01F10/126
摘要： 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.
摘要翻译：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。

8. 发明授权

US09953751B2 R-T-B based permanent magnet 有权
公开(公告)号：US09953751B2
公开(公告)日：2018-04-24
申请号：US14385855
申请日：2014-02-12
申请人： TDK CORPORATION
发明人： Kenichi Suzuki , Yuji Umeda , Ryuji Hashimoto
IPC分类号： H01F1/057 , H02K21/02
CPC分类号： H01F1/0577 , H02K21/02
摘要： 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

9. 发明授权

US09702945B2 Magnetic measurement device 有权
公开(公告)号：US09702945B2
公开(公告)日：2017-07-11
申请号：US14374640
申请日：2012-12-13
申请人： TDK CORPORATION
发明人： Kenichi Suzuki , Tsutomu Chikamatsu , Akio Ogawa , Kyung-ku Choi , Ryuji Hashimoto
IPC分类号： G01R33/12 , G01R33/10
CPC分类号： G01R33/12 , G01R33/10 , G01R33/1215
摘要： 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.

10. 发明授权

US09520216B2 R-T-B based sintered magnet 有权
标题翻译： R-T-B系烧结磁体
公开(公告)号：US09520216B2
公开(公告)日：2016-12-13
申请号：US14254220
申请日：2014-04-16
申请人： TDK CORPORATION
发明人： Yasushi Enokido , Kyung-Ku Choi , Ryuji Hashimoto , Daisuke Tanaka
IPC分类号： H01F1/057 , H01F1/053
CPC分类号： H01F1/0536 , H01F1/0577
摘要： An R-T-B based magnet as raw material undergoes heating treatment for a long time and main phase grains turn core-shell like. The R-T-B based magnet includes main phase grains having core and shell portions that covers the core. When the mass concentration of R1 and Y in the core portion is set as αR1 and αY respectively and the mass concentration of R1 and Y in the shell portion is set as βR1 and βY respectively, the ratio (B/A) between the mass concentration ratio of R1 to Y in the shell portion (βR1/βY=B) and the mass concentration ratio of R1 to Y in the core portion (αR1/αY=A) is 1.1 or more. Thus, the decrease of coercivity caused by Y addition is prevented, and the increase effect of temperature characteristics caused by addition of Y will lead to improve the magnetic properties under high temperature.
摘要翻译：作为原料的R-T-B系磁体经受长时间的加热处理，主相颗粒转变为核壳。 R-T-B系磁体包括具有覆盖芯的芯部和壳部的主相晶粒。核心部分的R1和Y的质量浓度分别设定为αR1和αY，壳部分的R1和Y的质量浓度分别设定为βR1和βY时，质量浓度壳部（R1R1 /βY= B）中的R1与Y的比例以及芯部（R1R1 /αY= A）的R1〜Y的质量浓度比为1.1以上。因此，防止由Y添加引起的矫顽力的降低，并且由于添加Y引起的温度特性的增加效果将导致在高温下提高磁性能。

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