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公开(公告)号：US20070159171A1
公开(公告)日：2007-07-12
申请号：US11641757
申请日：2006-12-20
IPC分类号： G01V3/00
CPC分类号： G01R33/383 , G01R33/3806 , G01R33/3873 , Y10T428/12014
摘要： Eddy current generated around a magnetic circuit in an MRI apparatus is one of the causes of deviation from an ideal magnetic field gradient waveform and causes image distortion, loss of strength, ghost generation, loss of signal, and spectral distortion. An object of the present invention is to suppress the generation of the eddy current. In an MRI apparatus, a ferromagnetic material formed from powder is used in a part of a magnetic circuit: the powder mainly comprising a mother phase containing iron or cobalt and showing ferromagnetism; and a high-resistance layer having a resistance not less than ten times as high as the mother phase and a Vickers hardness lower than that of the mother phase being formed in layers along parts of the surface of the powder on parts or the entire of the surface.
摘要翻译： 在MRI装置中围绕磁路产生的涡流是偏离理想磁场梯度波形的原因之一，并且导致图像失真，强度损失，重影产生，信号损失和光谱失真。 本发明的目的是抑制涡电流的产生。 在MRI装置中，在磁路的一部分中使用由粉末形成的铁磁材料，该粉末主要包含含有铁或钴的母相并显示出铁磁性; 以及耐电压不低于母相的十倍的高电阻层，维氏硬度低于母相的部分或全部沿着粉末表面的一部分形成的层， 表面。
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公开(公告)号：US20070151632A1
公开(公告)日：2007-07-05
申请号：US11641765
申请日：2006-12-20
申请人： Matahiro Komuro , Yuichi Satsu , Takao Imagawa , Katsumi Ishikawa , Takeyuki Itabashi , Yuzo Kozono
发明人： Matahiro Komuro , Yuichi Satsu , Takao Imagawa , Katsumi Ishikawa , Takeyuki Itabashi , Yuzo Kozono
IPC分类号： H01F1/20
CPC分类号： H01F1/0577 , H01F1/0572 , H01F1/0579 , H01F41/0293 , H02K1/02 , H02K1/246 , H02K1/276 , H02K1/2766 , H02K1/278
摘要： A lamellar high resistance layer having resistivity ten times or higher than that of a mother phase containing iron or cobalt is formed and an oxygen content is controlled to 10 to 10000 ppm so that the reliability and residual magnetic flux density are increased.
摘要翻译： 形成具有比含有铁或钴的母相的电阻率高十倍以上的层状高电阻层，将氧含量控制在10〜10000ppm，使得可靠性和剩余磁通密度增加。
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公开(公告)号：US07847555B2
公开(公告)日：2010-12-07
申请号：US12050438
申请日：2008-03-18
IPC分类号： G01V3/00
CPC分类号： G01R33/383 , G01R33/3806 , G01R33/3873 , Y10T428/12014
摘要： A magnet which includes ferromagnetic powder to be mainly a mother phase containing iron or cobalt. The ferromagnetic powder is provided with a high-resistance layer which has a resistance higher than or equal to ten times as high as a resistance of the mother phase and a Vickers hardness lower than a Vickers hardness of the mother phase. The high-resistance layer is being formed partially or entirely on the surface of the ferromagnetic powder.
摘要翻译： 一种磁铁，其包括主要是含有铁或钴的母相的铁磁性粉末。 铁磁粉末设置有高电阻层，其电阻高于或等于母相电阻的十倍，维氏硬度低于母相维氏硬度。 高电阻层部分地或完全地形成在铁磁性粉末的表面上。
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公开(公告)号：US07806991B2
公开(公告)日：2010-10-05
申请号：US11641765
申请日：2006-12-20
申请人： Matahiro Komuro , Yuichi Satsu , Takao Imagawa , Katsumi Ishikawa , Takeyuki Itabashi , Yuzo Kozono
发明人： Matahiro Komuro , Yuichi Satsu , Takao Imagawa , Katsumi Ishikawa , Takeyuki Itabashi , Yuzo Kozono
CPC分类号： H01F1/0577 , H01F1/0572 , H01F1/0579 , H01F41/0293 , H02K1/02 , H02K1/246 , H02K1/276 , H02K1/2766 , H02K1/278
摘要： A lamellar high resistance layer having resistivity ten times or higher than that of a mother phase containing iron or cobalt is formed and an oxygen content is controlled to 10 to 10000 ppm so that the reliability and residual magnetic flux density are increased.
摘要翻译： 形成具有比含有铁或钴的母相的电阻率高十倍以上的层状高电阻层，将氧含量控制在10〜10000ppm，使得可靠性和剩余磁通密度增加。
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公开(公告)号：US07352184B2
公开(公告)日：2008-04-01
申请号：US11641757
申请日：2006-12-20
IPC分类号： G01V3/00
CPC分类号： G01R33/383 , G01R33/3806 , G01R33/3873 , Y10T428/12014
摘要： Eddy current generated around a magnetic circuit in an MRI apparatus is one of the causes of deviation from an ideal magnetic field gradient waveform and causes image distortion, loss of strength, ghost generation, loss of signal, and spectral distortion. An object of the present invention is to suppress the generation of the eddy current. In an MRI apparatus, a ferromagnetic material formed from powder is used in a part of a magnetic circuit: the powder mainly comprising a mother phase containing iron or cobalt and showing ferromagnetism; and a high-resistance layer having a resistance not less than ten times as high as the mother phase and a Vickers hardness lower than that of the mother phase being formed in layers along parts of the surface of the powder on parts or the entire of the surface.
摘要翻译： 在MRI装置中围绕磁路产生的涡流是偏离理想磁场梯度波形的原因之一，并且导致图像失真，强度损失，重影产生，信号损失和光谱失真。 本发明的目的是抑制涡电流的产生。 在MRI装置中，在磁路的一部分中使用由粉末形成的铁磁材料，该粉末主要包含含有铁或钴的母相并显示出铁磁性; 以及耐电压不低于母相的十倍的高电阻层，维氏硬度低于母相的部分或全部沿着粉末表面的一部分形成的层， 表面。
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公开(公告)号：US20080171216A1
公开(公告)日：2008-07-17
申请号：US12050438
申请日：2008-03-18
IPC分类号： H01F1/00
CPC分类号： G01R33/383 , G01R33/3806 , G01R33/3873 , Y10T428/12014
摘要： A magnet which includes ferromagnetic powder to be mainly a mother phase containing iron or cobalt. The ferromagnetic powder is provided with a high-resistance layer which has a resistance higher than or equal to ten times as high as a resistance of the mother phase and a Vickers hardness lower than a Vickers hardness of the mother phase. The high-resistance layer is being formed partially or entirely on the surface of the ferromagnetic powder.
摘要翻译： 一种磁铁，其包括主要是含有铁或钴的母相的铁磁性粉末。 铁磁粉末设置有高电阻层，其电阻高于或等于母相电阻的十倍，维氏硬度低于母相维氏硬度。 高电阻层部分地或完全地形成在铁磁性粉末的表面上。
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公开(公告)号：US08303732B2
公开(公告)日：2012-11-06
申请号：US12696074
申请日：2010-01-29
申请人： Hiroyuki Suzuki , Takao Imagawa , Yuichi Satsu , Matahiro Komuro
发明人： Hiroyuki Suzuki , Takao Imagawa , Yuichi Satsu , Matahiro Komuro
IPC分类号： H01F1/057
CPC分类号： C22C1/0441 , C22C2202/02 , H01F1/0577 , H01F41/0293
摘要： A rare earth magnet having a composition represented by RTB wherein R denotes a rare earth element, T a transition metal and B boron, the magnet being composed of magnet powder constituted by crystalline particles. The particles of the magnetic powder have a ratio of a short diameter being 10 μm or more to a long diameter is 0.5 or less. An element Rm having a magnetic anisotropy higher than that of the rare earth element is contained in the surface and inside of the magnet constituted by the magnet powder in an approximately constant concentration. An oxy-fluoride and carbon are present at boundaries of the particles of the magnet powder.
摘要翻译： 具有由RTB表示的组成的稀土类磁体，其中R表示稀土元素，T是过渡金属和B硼，所述磁体由由结晶颗粒构成的磁体粉末组成。 磁粉的粒子的短径为10μm以上的长径比为0.5以下。 具有高于稀土元素的磁各向异性的元素Rm被包含在以大致恒定的浓度由磁体粉末构成的磁体的表面和内部。 氧氟化物和碳存在于磁体粉末颗粒的边界处。
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公开(公告)号：US20120025651A1
公开(公告)日：2012-02-02
申请号：US13257331
申请日：2010-02-18
申请人： Matahiro Komuro , Yuichi Satsu , Hiroyuki Suzuki , Takao Imagawa
发明人： Matahiro Komuro , Yuichi Satsu , Hiroyuki Suzuki , Takao Imagawa
CPC分类号： H01F1/0577 , C22C2202/02 , H01F1/0572 , H01F41/0266 , H01F41/0293
摘要： A sintered magnet according to the present invention is a sintered magnet configured from a magnetic powder grain having Nd2Fe14B as a main component, in which: fluorine, a heavy rare earth element, oxygen, and carbon are segregated in part of grain-boundary regions of said sintered magnetic powder grain; concentration of the carbon is higher than concentration of the fluorine at a grain-boundary triple junction of the grain-boundary region; and concentration of the heavy rare earth element decreases from said grain-boundary triple junction toward an inside of said magnetic powder grain.
摘要翻译： 根据本发明的烧结磁体是由以Nd2Fe14B为主要成分的磁性粉末颗粒构成的烧结磁体，其中，氟，重稀土元素，氧和碳在部分晶界区域分离 所述烧结磁粉颗粒; 碳的浓度高于晶界的晶界三重结的氟浓度; 并且所述重稀土元素的浓度从所述晶界三重结点向所述磁粉颗粒的内部减少。
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公开(公告)号：US07972450B2
公开(公告)日：2011-07-05
申请号：US12708580
申请日：2010-02-19
申请人： Matahiro Komuro , Yuichi Satsu , Takao Imagawa
发明人： Matahiro Komuro , Yuichi Satsu , Takao Imagawa
CPC分类号： G11B5/82 , B82Y10/00 , G11B5/65 , G11B5/743 , H01F1/0571 , H01F41/0293 , H02K1/02 , Y10T29/53261 , Y10T409/305656 , Y10T409/305712 , Y10T409/305768 , Y10T409/305824 , Y10T428/258 , Y10T428/26
摘要： A magnet comprising grains of a ferromagnetic material whose main component is iron and a fluorine compound layer or an oxy-fluorine compound layer of fluoride compound particles of alkali metals, alkaline earth metals and rare earth elements, present on the surface of the ferromagnetic material grains, wherein an amount of iron atoms in the fluorine compound particles is 1 to 50 atomic %.
摘要翻译： 一种磁铁，其主要成分为铁，铁素体晶粒表面存在氟化合物层或碱金属，碱土金属，稀土元素的氟化物粒子的氧氟化合物层， 其中，所述氟化合物粒子中的铁原子量为1〜50原子％。
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10.发明授权Compacted magnetic core with high resistance, manufacturing method thereof, and motor for electric car 有权具有高电阻的压制磁芯，其制造方法和电动汽车用电动机公开(公告)号：US07816820B2
公开(公告)日：2010-10-19
申请号：US11924779
申请日：2007-10-26
申请人： Takao Imagawa , Yuichi Satsu , Matahiro Komuro
发明人： Takao Imagawa , Yuichi Satsu , Matahiro Komuro
CPC分类号： H01F41/0246 , B22F1/02 , B22F2003/248 , B22F2998/10 , C22C2202/02 , H01F1/24 , H01F3/08 , H02K1/02 , Y02T10/641 , B22F9/08 , B22F1/0085 , B22F3/02 , B22F3/24
摘要： A compacted magnetic core with a high resistance, which comprises compacted magnetic powder of an iron powder or an alloy powder containing iron as a main ingredient and a layer of a rare earth metal fluoride or an alkaline earth metal fluoride on the surface of the powder, wherein the rare earth metal fluoride or the alkaline earth metal fluoride contains fluorine-depleted crystal lattice at a rate of 10% or less.
摘要翻译： 一种具有高电阻的压制磁芯，其包括在粉末表面上的铁粉或含铁作为主要成分的合金粉末和稀土金属氟化物或碱土金属氟化物层的压粉磁粉， 其中所述稀土金属氟化物或所述碱土金属氟化物以10％以下的比例含有富含氟的晶格。
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