Patents by Inventor Masao Yano

Masao Yano has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20200036322
    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.
    Type: Application
    Filed: July 2, 2019
    Publication date: January 30, 2020
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Noritsugu SAKUMA, Masao YANO, Masaaki ITO, Tetsuya SHOJI, Hidefumi KISHIMOTO, Akira KATO
  • Publication number: 20190362870
    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<x<1, y=12 to 20, z=5.6 to 6.5, w=0 to 8, and v=0 to 2), wherein the average grain size of the crystal grain is 1,000 nm or less, the crystal grain consists of a core and an outer shell, the core has a composition of R1 that is richer than R2, and the outer shell has a composition of R2 that is richer than R1.
    Type: Application
    Filed: August 6, 2019
    Publication date: November 28, 2019
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masaaki ITO, Masao YANO, Hidefumi KISHIMOTO, Noritsugu SAKUMA, Tetsuya SHOJI, Akira MANABE
  • Patent number: 10468165
    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<x<1, y=12 to 20, z=5.6 to 6.5, w=0 to 8, and v=0 to 2), wherein the average grain size of the crystal grain is 1,000 nm or less, the crystal grain consists of a core and an outer shell, the core has a composition of R1 that is richer than R2, and the outer shell has a composition of R2 that is richer than R1.
    Type: Grant
    Filed: June 5, 2014
    Date of Patent: November 5, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masaaki Ito, Masao Yano, Hidefumi Kishimoto, Noritsugu Sakuma, Tetsuya Shoji, Akira Manabe
  • Patent number: 10464132
    Abstract: A method for producing a raw material powder of a permanent magnet, includes: preparing a material powder of a permanent magnet, measuring magnetic characteristics of the material powder, and judging the quality of the material powder as the raw material powder based on a preliminarily determined relation between magnetic characteristics and the structure of the material powder. A method for producing a permanent magnet includes integrating material powders judged as good in the step of judging the quality as raw material powders by the method for producing a raw material powder of a permanent magnet. A method for inspecting a permanent magnet material powder includes transmitting a magnetic field to a material powder of a permanent magnet, receiving the magnetic field from the material powder, and measuring a magnetic field difference between the transmitted magnetic field and the received magnetic field as magnetic characteristics of the material powder.
    Type: Grant
    Filed: May 24, 2013
    Date of Patent: November 5, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Noritsugu Sakuma, Hidefumi Kishimoto, Mikiya Nozaki, Masao Yano, Tetsuya Shoji, Akira Manabe
  • Patent number: 10424426
    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<x<1, y=12 to 20, z=5.6 to 6.5, w=0 to 8, and v=0 to 2), wherein the average grain size of the crystal grain is 1,000 nm or less, the crystal grain consists of a core and an outer shell, the core has a composition of R1 that is richer than R2, and the outer shell has a composition of R2 that is richer than R1.
    Type: Grant
    Filed: June 5, 2014
    Date of Patent: September 24, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masaaki Ito, Masao Yano, Hidefumi Kishimoto, Noritsugu Sakuma, Tetsuya Shoji, Akira Manabe
  • Patent number: 10351935
    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<c<7, 0?d?1, and 1?e?18), in which a main phase of the magnetic compound includes a ThMn12 type crystal structure, and a volume percentage of an ?-(Fe,Co) phase is 20% or lower.
    Type: Grant
    Filed: September 3, 2015
    Date of Patent: July 16, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Noritsugu Sakuma, Akira Kato, Kota Washio, Hidefumi Kishimoto, Masao Yano, Akira Manabe, Masaaki Ito, Shunji Suzuki, Kurima Kobayashi
  • Patent number: 10325704
    Abstract: A rare earth magnet having a main phase and a sub-phase, wherein the main phase has a ThMn12-type crystal structure; the sub-phase contains at least any one of an Sm5Fe17-based phase, an SmCo5-based phase, an Sm2O3-based phase, and an Sm7Cu3-based phase; assuming that the volume of the rare earth magnet is 100%, the volume fraction of the sub-phase is from 2.3 to 9.5% and the volume fraction of an ?-Fe phase is 9.0% or less; and the density of the rare earth magnet is 7.0 g/cm3 or more.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: June 18, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Noritsugu Sakuma, Akira Kato, Masao Yano, Shunji Suzuki, Kurima Kobayashi
  • Publication number: 20180308633
    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 ?m, 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.
    Type: Application
    Filed: April 13, 2018
    Publication date: October 25, 2018
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masaaki ITO, Noritsugu SAKUMA, Masao YANO, Hidefumi KISHIMOTO, Tetsuya SHOJI
  • Patent number: 10090090
    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.
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: October 2, 2018
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventors: Hidefumi Kishimoto, Noritsugu Sakuma, Masao Yano, Weibin Cui, Yukiko Takahashi, Kazuhiro Hono
  • Publication number: 20180182515
    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.
    Type: Application
    Filed: December 19, 2017
    Publication date: June 28, 2018
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masaaki ITO, Noritsugu SAKUMA, Masao YANO, Hidefumi KISHIMOTO, Tetsuya SHOJI
  • Publication number: 20180182519
    Abstract: A rare earth magnet includes a main phase, a grain boundary phase present around the main phase and an intermediate phase interposed between the main phase and the grain boundary phase, and has an overall composition that is represented by the formula ((Ce(1-x)Lax)(1-y)R1y)pT(100-p-q-r)BqM1r.(R21-zM2z)s (where, R1 and R2 are rare earth elements other than Ce and La, T is at least one selected from among Fe, Ni, and Co, M1 is an element having a small amount that does not influence magnetic characteristics, and M2 is an alloy element for which a melting point of R21-zM2z is lower than a melting point of R2). A total concentration of Ce and La is higher in the main phase than in the intermediate phase, and a concentration of R2 is higher in the intermediate phase than in the main phase.
    Type: Application
    Filed: December 5, 2017
    Publication date: June 28, 2018
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masaaki Ito, Noritsugu Sakuma, Tetsuya Shoji, Hidefumi Kishimoto, Masao Yano
  • Publication number: 20180182516
    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.
    Type: Application
    Filed: December 19, 2017
    Publication date: June 28, 2018
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masaaki ITO, Noritsugu SAKUMA, Masao YANO, Hidefumi KISHIMOTO, Tetsuya SHOJI
  • Publication number: 20180040404
    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.
    Type: Application
    Filed: October 16, 2017
    Publication date: February 8, 2018
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventors: Hidefumi KISHIMOTO, Noritsugu SAKUMA, Masao YANO, Weibin CUI, Yukiko TAKAHASHI, Kazuhiro HONO
  • Patent number: 9835569
    Abstract: A magnetic measurement system includes an X-ray source, a monochromator that converts right- and left-polarization X-ray into right- and left-monochromatic X-ray, an aperture slit that allows the right- and left-monochromatic X-ray to pass through, an analytical section, and piezoelectric scanning devices. The analytical section has a Fresnel zone plate that receives and focuses the right- and left-monochromatic X-ray on a single point being 10 nm or less wide of a magnetic sample, an order-sorting aperture that allows the focused X-ray to selectively pass through, a sample-stage that sets a comparatively thick magnetic sample that is more than 150 nm thick and less than or equal to 1000 nm thick to be irradiated with the X-ray, and an X-ray-detector that detects transmittance of transmission X-ray passing through the comparatively thick sample and that generates X-ray magnetic circular dichroism (XMCD) data by directly measuring the detected transmittance of the transmission X-ray.
    Type: Grant
    Filed: March 28, 2017
    Date of Patent: December 5, 2017
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION
    Inventors: Masao Yano, Kanta Ono
  • Patent number: 9818520
    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.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: November 14, 2017
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventors: Hidefumi Kishimoto, Noritsugu Sakuma, Masao Yano, Weibin Cui, Yukiko Takahashi, Kazuhiro Hono
  • Patent number: 9766190
    Abstract: A method, system and apparatus are provided to measure magnetic characteristics of a comparatively thick magnetic sample in a magnetic field or nonmagnetic field by X-ray magnetic circular dichroism (XMCD). In particular, the method, system and apparatus measure the magnetic characteristics of the thick magnetic sample by irradiating the sample with X-ray, and detecting transmissive X-ray passing through the sample.
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: September 19, 2017
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION
    Inventors: Masao Yano, Kanta Ono
  • Publication number: 20170199135
    Abstract: A system and an apparatus are provided to measure magnetic characteristic of crystal grains composing magnetic polycrystalline materials in the magnetic field or nonmagnetic field by X-ray magnetic circular dichroism (XMCD). In particular, the system and the apparatus measure the magnetic characteristic of comparatively very thick materials.
    Type: Application
    Filed: March 28, 2017
    Publication date: July 13, 2017
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION
    Inventors: Masao Yano, Kanta Ono
  • Publication number: 20170178772
    Abstract: A rare earth magnet having a main phase and a sub-phase, wherein the main phase has a ThMn12-type crystal structure; the sub-phase contains at least any one of an Sm5Fe17-based phase, an SmCo5-based phase, an Sm2O3-based phase, and an Sm7Cu3-based phase; assuming that the volume of the rare earth magnet is 100%, the volume fraction of the sub-phase is from 2.3 to 9.5% and the volume fraction of an ?-Fe phase is 9.0% or less; and the density of the rare earth magnet is 7.0 g/cm3 or more.
    Type: Application
    Filed: December 15, 2016
    Publication date: June 22, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Noritsugu SAKUMA, Akira KATO, Masao YANO, Shunji SUZUKI, Kurima KOBAYASHI
  • Publication number: 20170084370
    Abstract: A magnetic compound represented by the formula (R1(1-x)R2x)a(Fe(1-y)Coy)bTcMd wherein R1 is one or more elements selected from the group consisting of Sm, Pm, Er, Tm and Yb, R2 is one or more elements selected from the group consisting of Zr, La, Ce, Pr, Nd, Eu, Gd, Tb, Dy, Ho and Lu, T is one or more elements selected from the group consisting of Ti, V, Mo, Si and W, M is one or more elements selected from the group consisting of unavoidable impurity elements, Al, Cr, Cu, Ga, Ag and Au, 0?x?0.7, 0?y?0.7, 4?a?20, b=100-a-c-d, 0<c<7.7, and 0?d?3, the magnetic compound having a ThMn12-type crystal structure, wherein the volume fraction of ?-(Fe, Co) phase is less than 12.3%.
    Type: Application
    Filed: August 10, 2016
    Publication date: March 23, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Noritsugu SAKUMA, Masao YANO, Akira KATO, Akira MANABE, Shunji SUZUKI, Kurima KOBAYASHI
  • Publication number: 20160141083
    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<x<1, y=12 to 20, z=5.6 to 6.5, w=0 to 8, and v=0 to 2), wherein the average grain size of the crystal grain is 1,000 nm or less, the crystal grain consists of a core and an outer shell, the core has a composition of R1 that is richer than R2, and the outer shell has a composition of R2 that is richer than R1.
    Type: Application
    Filed: June 5, 2014
    Publication date: May 19, 2016
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masaaki ITO, Masao YANO, Hidefumi KISHIMOTO, Noritsugu SAKUMA, Tetsuya SHOJI, Akira MANABE