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公开(公告)号：US20200036322A1
公开(公告)日：2020-01-30
申请号：US16460100
申请日：2019-07-02
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Noritsugu SAKUMA , Masao YANO , Masaaki ITO , Tetsuya SHOJI , Hidefumi KISHIMOTO , Akira KATO
Abstract: To provide a motor control method ensuring that dragging loss at the time of high rotation can be reduced.A motor control method, wherein a composite permanent magnet has a core part and a shell part, the Curie temperature of one of the core part and the shell part is Tc1 K, and the Curie temperature of another is Tc2 K, and wherein when the magnitude of the reluctance torque is equal to or greater than the magnitude of the magnet torque, the temperature of the composite permanent magnet is set at Ts K that is (Tc1−100) K or higher and lower than Tc2 K and when the magnitude of the reluctance torque is less than the magnitude of the magnetic torque, the temperature of the composite permanent magnet is set at lower than the temperature Ts K or Tc1 K, whichever is lower.
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公开(公告)号：US20180182516A1
公开(公告)日：2018-06-28
申请号：US15846343
申请日：2017-12-19
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Masaaki ITO , Noritsugu SAKUMA , Masao YANO , Hidefumi KISHIMOTO , Tetsuya SHOJI
CPC classification number: H01F1/058 , C22C38/002 , C22C38/005 , C22C38/06 , C22C38/16 , C22C2202/02 , H01F1/0577
Abstract: To provide an R—Fe—B-based rare earth magnet where R is mainly Ce, ensuring that even when a rare earth element R1 except for Ce is very small in amount or is not present, the coercive force can be enhanced.A rare earth magnet wherein the rare earth magnet has a total composition represented by the formula: CepR1qT(100-p-q-r-s)BrM1s (wherein R1 is a rare earth element except for Ce, T is one or more members selected from Fe, Ni and Co, M1 is one or more members selected from Ti, Ga, Zn, Si, Al, Nb, Zr, Mn, V, W, Ta, Ge, Cu, Cr, Hf, Mo, P, C, Mg, Hg, Ag, and Au, and an unavoidable impurity, and p, q, r, and s are 11.80≤p≤12.90, 0≤q≤3.00, 5.00≤r≤20.00, and 0≤s≤3.00), and wherein the rear earth magnet comprises a magnetic phase and a (Ce,R1)-rich phase present around the magnetic phase.
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公开(公告)号：US20180308633A1
公开(公告)日：2018-10-25
申请号：US15953183
申请日：2018-04-13
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Masaaki ITO , Noritsugu SAKUMA , Masao YANO , Hidefumi KISHIMOTO , Tetsuya SHOJI
CPC classification number: H01F41/0293 , B22F1/0011 , B22F9/04 , B22F2202/05 , B22F2301/355 , B22F2304/10 , C22C38/005 , C22C38/06 , C22C38/16 , H01F1/0576 , H01F1/0577 , H01F41/0266
Abstract: A method for producing a rare earth magnet, including preparing a melt of a first alloy having a composition represented by (R1vR2wR3x)yTzBsM1t (wherein R1 is a light rare earth element, R2 is an intermediate rare earth element, R3 is a heavy rare earth element, T is an iron group element, and M1 is an impurity element, etc.), cooling the melt of the first alloy at a rate of from 100 to 102 K/sec to obtain a first alloy ingot, pulverizing the first alloy ingot to obtain a first alloy powder having a particle diameter of 1 to 20 μm, preparing a melt of a second alloy having a composition represented by (R4pR5q)100-uM2u (wherein R4 is a light rare earth element, R5 is an intermediate or heavy rare earth element, M2 is an alloy element, etc.), and putting the first alloy powder into contact with the melt of the second alloy.
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Patent Agency Ranking
公开(公告)号：US20180182515A1
公开(公告)日：2018-06-28
申请号：US15846317
申请日：2017-12-19
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Masaaki ITO , Noritsugu SAKUMA , Masao YANO , Hidefumi KISHIMOTO , Tetsuya SHOJI
CPC classification number: H01F1/058 , B22F3/24 , B22F2003/248 , B22F2301/355 , C22C1/0441 , C22C33/0278 , C22C38/002 , C22C38/005 , C22C38/06 , C22C38/16 , C22C2202/02 , H01F1/0577 , H01F41/0253
Abstract: A rare earth magnet comprising a main phase, a grain boundary phase present around the main phase, and an intermediate phase sandwiched between the main phase and the grain boundary phase, and having a total composition of the rare earth magnet represented by the formula: CepR1qT(100-p-q-r-s)BrM1s.(R21-xM2x)t R1 and R2 are a rare earth element except for Ce, T is one or more members selected from Fe, Ni, and Co, M1 is a minor element, and M2 is an alloy element that makes, the melting point of R21-xM2x to be lower than the melting point of R2 the concentration of Ce is higher in the main phase than in the intermediate phase, and the concentration of R2 is higher in the intermediate phase than in the main phase, and a production method thereof.
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公开(公告)号：US20160071635A1
公开(公告)日：2016-03-10
申请号：US14844478
申请日：2015-09-03
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Noritsugu SAKUMA , Akira KATO , Kota WASHIO , Hidefumi KISHIMOTO , Masao YANO , Akira MANABE , Masaaki ITO , Shunji SUZUKI , Kurima KOBAYASHI
CPC classification number: C22C30/02 , C22C1/02 , C22C30/00 , C22C38/00 , H01F1/0593
Abstract: Provided is a magnetic compound represented by the formula (R(1-x)Zrx)a(Fe(1-y)Coy)bTcMdAe (wherein R represents one or more rare earth elements, T represents one or more elements selected from the group consisting of Ti, V, Mo, and W, M represents one or more elements selected from the group consisting of unavoidable impurity elements, Al, Cr, Cu, Ga, Ag, and Au, A represents one or more elements selected from the group consisting of N, C, H, and P, 0≦x≦0.5, 0≦y≦0.6, 4≦a≦20, b=100−a−c−d, 0
Abstract translation: 提供由式（R（1-x）Zr x）a（Fe（1-y）Coy）bTcMdAe表示的磁性化合物（其中R表示一种或多种稀土元素，T表示一种或多种选自 由Ti，V，Mo和W组成，M表示选自不可避免的杂质元素Al，Cr，Cu，Ga，Ag和Au中的一种或多种元素，A表示选自以下的一种或多种元素： 由N，C，H和P组成，0＆nlE; x＆nlE; 0.5,0和nlE; y＆nlE; 0.6,4和nlE; a＆nlE; 20b = 100-a-c-d，0
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公开(公告)号：US20190362870A1
公开(公告)日：2019-11-28
申请号：US16532651
申请日：2019-08-06
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Masaaki ITO , Masao YANO , Hidefumi KISHIMOTO , Noritsugu SAKUMA , Tetsuya SHOJI , Akira MANABE
Abstract: To provide a rare earth magnet ensuring excellent magnetic anisotropy while reducing the amount of Nd, etc., and a manufacturing method thereof.A rare earth magnet comprising a crystal grain having an overall composition of (R2(1-x)R1x)yFe100-y-w-z-vCowBzTMv (wherein R2 is at least one of Nd, Pr, Dy and Tb, R1 is an alloy of at least one or two or more of Ce, La, Gd, Y and Sc, TM is at least one of Ga, Al, Cu, Au, Ag, Zn, In and Mn, 0
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公开(公告)号：US20180040404A1
公开(公告)日：2018-02-08
申请号：US15784975
申请日：2017-10-16
Inventor： Hidefumi KISHIMOTO , Noritsugu SAKUMA , Masao YANO , Weibin CUI , Yukiko TAKAHASHI , Kazuhiro HONO
CPC classification number: H01F7/02 , C22C38/005 , H01F1/0311 , H01F10/126
Abstract: The invention provides a nanocomposite magnet, which has achieved high coercive force and high residual magnetization. The magnet is a non-ferromagnetic phase that is intercalated between a hard magnetic phase with a rare-earth magnet composition and a soft magnetic phase, wherein the non-ferromagnetic phase reacts with neither the hard nor soft magnetic phase. A hard magnetic phase contains Nd2Fe14B, a soft magnetic phase contains Fe or Fe2Co, and a non-ferromagnetic phase contains Ta. The thickness of the non-ferromagnetic phase containing Ta is 5 nm or less, and the thickness of the soft magnetic phase containing Fe or Fe2Co is 20 nm or less. Nd, or Pr, or an alloy of Nd and any one of Cu, Ag, Al, Ga, and Pr, or an alloy of Pr and any one of Cu, Ag, Al, and Ga is diffused into a grain boundary phase of the hard magnetic phase of Nd2Fe14B.
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公开(公告)号：US20160141083A1
公开(公告)日：2016-05-19
申请号：US14896215
申请日：2014-06-05
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Masaaki ITO , Masao YANO , Hidefumi KISHIMOTO , Noritsugu SAKUMA , Tetsuya SHOJI , Akira MANABE
Abstract: To provide a rare earth magnet ensuring excellent magnetic anisotropy while reducing the amount of Nd, etc., and a manufacturing method thereof.A rare earth magnet comprising a crystal grain having an overall composition of (R2(1-x)R1x)yFe100-y-w-z-vCowBzTMv (wherein R2 is at least one of Nd, Pr, Dy and Tb, R1 is an alloy of at least one or two or more of Ce, La, Gd, Y and Sc, TM is at least one of Ga, Al, Cu, Au, Ag, Zn, In and Mn, 0
Abstract translation: 提供一种确保优异的磁各向异性同时减少Nd等的量的稀土磁体及其制造方法。 包含具有（R2（1-x）R1x）yFe100-ywz-vCowBzTMv（其中R2是Nd，Pr，Dy和Tb中至少一种）的总体组成的晶粒的稀土磁体，R1是至少为 Ce，La，Gd，Y和Sc中的一种或两种以上，TM是Ga，Al，Cu，Au，Ag，Zn，In和Mn中的至少一种，0
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