Patents by Inventor Munekatsu Shimada

Munekatsu Shimada 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).

  • Patent number: 8692545
    Abstract: A magnetostrictive stress sensor (11, 12, 13, 14, 15, 16) includes: a magnetic member {20, (107, 108, 109, 110, 111, 112)} having a magnetostriction; a permanent magnet (30, 35, 113) adjacent to the magnetic member; a magnetic sensor (40, 104A, 104B) for detecting a leak magnetic flux on a side opposite to the permanent magnet with respect to the magnetic member, wherein the leak magnetic flux changes according to a stress acting on the magnetic member and the magnetic sensor detects the change of the leak magnetic flux, to thereby detect the stress acting on the magnetic member, and a direction (21, 108A, 109A) of the stress acting on the magnetic member is substantially orthogonal to a magnetizing direction (31, 31, 113A) of the permanent magnet.
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: April 8, 2014
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Munekatsu Shimada, Hiroshi Sakurai, Yoshio Kawashita, Kiyohiro Uramoto, Toshimitsu Matsuoka, Masao Aihara, Mitsuaki Fujita, Masaharu Ooshima
  • Publication number: 20100127698
    Abstract: A magnetostrictive stress sensor (11, 12, 13, 14, 15, 16) includes: a magnetic member {20, (107, 108, 109, 110, 111, 112)} having a magnetostriction; a permanent magnet (30, 35, 113) adjacent to the magnetic member; a magnetic sensor (40, 104A, 104B) for detecting a leak magnetic flux on a side opposite to the permanent magnet with respect to the magnetic member, wherein the leak magnetic flux changes according to a stress acting on the magnetic member and the magnetic sensor detects the change of the leak magnetic flux, to thereby detect the stress acting on the magnetic member, and a direction (21, 108A, 109A) of the stress acting on the magnetic member is substantially orthogonal to a magnetizing direction (31, 31, 113A) of the permanent magnet.
    Type: Application
    Filed: February 27, 2008
    Publication date: May 27, 2010
    Inventors: Munekatsu Shimada, Hiroshi Sakurai, Yoshio Kawashita, Kiyohiro Uramoto, Toshimitsu Matsuoka, Masao Aihara, Mitsuaki Fujita, Masaharu Ooshima
  • Patent number: 7632360
    Abstract: A rare earth magnet powder has a chemical composition which includes R: 5 to 20% (wherein, R represents one or two or more rare earth elements being inclusive of Y but exclusive of Dy and Tb), one or two of Dy and Tb: 0.01 to 10%, and B: 3 to 20%, with the balance comprising Fe and inevitable impurities; and an average particle diameter of 10 to 1,000 ?m, wherein 70% or more of the entire surface of the rare earth magnet powder is covered with a layer being rich in the content of one or two of Dy and Tb and having a thickness of 0.05 to 50 ?m.
    Type: Grant
    Filed: May 13, 2004
    Date of Patent: December 15, 2009
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Katsuhiko Mori, Ryoji Nakayama, Hideaki Ono, Takae Ono, legal representative, Tetsurou Tayu, Munekatsu Shimada, Makoto Kano, Yoshio Kawashita
  • Patent number: 7608153
    Abstract: A rare earth magnet includes rare earth magnet particles; and amorphous and/or crystalline terbium oxide present at the boundary of the rare earth magnet particles and represented by the formula: TbOn, wherein 1.5<n?2. The rare earth magnet prevents decrease eddy current effectively.
    Type: Grant
    Filed: December 21, 2004
    Date of Patent: October 27, 2009
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Tetsurou Tayu, Hideaki Ono, Takae Ono, legal representative, Yoshio Kawashita, Makoto Kano, Munekatsu Shimada
  • Publication number: 20080199715
    Abstract: A Nd—Fe—B type anisotropic exchange spring magnet is produced by a method of obtaining powder of a Nd—Fe—B type rare earth magnet alloy which comprises hard magnetic phases and soft magnetic phases wherein a minimum width of the soft magnetic phases is smaller than or equal to 1 ?m and a minimum distance between the soft magnetic phases is greater than or equal to 0.1 ?m, obtaining a compressed powder body by compressing the powder, and obtaining the Nd—Fe—B type anisotropic exchange spring magnet by sintering the compressed powder body using a discharge plasma sintering unit.
    Type: Application
    Filed: April 15, 2008
    Publication date: August 21, 2008
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Munekatsu Shimada, Hideaki Ono, Takae Ono, Makoto Kano, Tetsurou Tayu
  • Patent number: 7371292
    Abstract: A Nd—Fe—B type anisotropic exchange spring magnet is produced by a method of obtaining powder of a Nd—Fe—B type rare earth magnet alloy which comprises hard magnetic phases and soft magnetic phases wherein a minimum width of the soft magnetic phases is smaller than or equal to 1 ?m and a minimum distance between the soft magnetic phases is greater than or equal to 0.1 ?m, obtaining a compressed powder body by compressing the powder, and obtaining the Nd—Fe—B type anisotropic exchange spring magnet by sintering the compressed powder body using a discharge plasma sintering unit.
    Type: Grant
    Filed: November 12, 2003
    Date of Patent: May 13, 2008
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Munekatsu Shimada, Takae Ono, legal representative, Makoto Kano, Tetsurou Tayu, Hideaki Ono
  • Patent number: 7344605
    Abstract: An anisotropic exchange spring magnet powder complexing a hard magnetic material and a soft magnetic material, wherein a rare earth metal element, a transition metal element, boron and carbon and the like are contained, and the hard magnetic material and soft magnetic material have crystal particle diameters of 150 nm or less. A method of producing an anisotropic exchange spring magnet powder comprises treating a crystalline mother material containing a hard magnetic material and soft magnetic material or the crystalline mother material having amorphous parts, in a continuous process composed of an amorphising process and the following crystallizing process, repeated once or more times. An anisotropic exchange spring magnet is obtained by treatment, in an anisotropy- imparting molding process and a solidification process, of an anisotropic exchange spring magnet powder.
    Type: Grant
    Filed: December 20, 2005
    Date of Patent: March 18, 2008
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Hideaki Ono, Norihisa Waki, Munekatsu Shimada
  • Patent number: 7279053
    Abstract: The present invention provides a rare earth magnet superior in magnetic properties and thermal stability. In an aspect of the present invention, a production method of an alloy thin ribbon for a rare earth magnet includes a step to obtain a quenched thin ribbon by feeding a molten alloy containing praseodymium (Pr), iron (Fe), cobalt (Co), titanium (Ti), boron (B), and silicon (Si) on a rotating roll and a step to apply heat treatment to the quenched thin ribbon at a heating rate within a range of 100° to 150° C./min to crystallize the quenched thin ribbon.
    Type: Grant
    Filed: August 22, 2005
    Date of Patent: October 9, 2007
    Assignees: Nissan Motor Co., Ltd., Horoshi Yamamoto
    Inventors: Munekatsu Shimada, Takae Ono, legal representative, Tetsurou Tayu, Makoto Kano, Hiroshi Yamamoto, Hideaki Ono, deceased
  • Publication number: 20070181219
    Abstract: The present invention provides a rare earth magnet superior in magnetic properties and thermal stability. In an aspect of the present invention, a production method of an alloy thin ribbon for a rare earth magnet includes a step to obtain a quenched thin ribbon by feeding a molten alloy containing praseodymium (Pr), iron (Fe), cobalt (Co), titanium (Ti), boron (B), and silicon (Si) on a rotating roll and a step to apply heat treatment to the quenched thin ribbon at a heating rate within a range of 100° to 150° C./min to crystallize the quenched thin ribbon.
    Type: Application
    Filed: August 22, 2005
    Publication date: August 9, 2007
    Inventors: Munekatsu Shimada, Hideaki Ono, Takae Ono, Tetsurou Tayu, Makoto Kano, Hiroshi Yamamoto
  • Publication number: 20070108169
    Abstract: A laser peening apparatus for manufacturing a rotor using an electrical steel sheet with low iron loss for enabling high speed rotation of a motor. The laser peening apparatus includes a laser irradiating device for irradiating with a laser through a liquid the rotor made of an electrical steel sheet with low iron loss, and a drive device for moving the rotor relative to an irradiation spot of the laser so that the laser irradiates along a bridge side on an inner circumference of a magnet insertion window of the rotor.
    Type: Application
    Filed: September 21, 2004
    Publication date: May 17, 2007
    Inventors: Munekatsu Shimada, Hideaki Ono, Takae Ono, Tetsurou Tayu, Makoto Kano, Yu Owada, Naoshi Sakata, Kimihiro Shibata, Toshimitsu Matsuoka, Nobuhiko Tanaka, Yukio Watanabe, Yuji Sano, Hironobu Kimura
  • Publication number: 20070079904
    Abstract: A rare earth magnet powder has a chemical composition which includes R: 5 to 20% (wherein, R represents one or two or more rare earth elements being inclusive of Y but exclusive of Dy and Tb), one or two of Dy and Tb: 0.01 to 10%, and B: 3 to 20%, with the balance comprising Fe and inevitable impurities; and an average particle diameter of 10 to 1,000 ?m, wherein 70% or more of the entire surface of the rare earth magnet powder is covered with a layer being rich in the content of one or two of Dy and Tb and having a thickness of 0.05 to 50 ?m.
    Type: Application
    Filed: May 13, 2004
    Publication date: April 12, 2007
    Inventors: Katsuhiko Mori, Ryoji Nakayama, Hideaki Ono, Tetsurou Tayu, Munekatsu Shimada, Makoto Kano, Yoshio Kawashita
  • Publication number: 20070012380
    Abstract: A rare earth magnet has a sintered body including: rare earth magnet particles; and a rare earth oxide being present between the rare earth magnet particles, the rare earth oxide being represented by a following general formula (I): R2O3 ??(I) where R is any one of terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium. The rare earth magnet particle is constituted by a cluster of numerous crystal grains, and an electric resistivity of the rare earth magnet is within a range from 26.0 to 75.0 ??m.
    Type: Application
    Filed: May 26, 2006
    Publication date: January 18, 2007
    Inventors: Tetsurou Tayu, Hideaki Ono, Munekatsu Shimada, Makoto Kano, Takae Ono
  • Patent number: 7147686
    Abstract: A rare earth magnet comprises rare earth magnet particles and a rare earth oxide being present between the rare earth magnet particles. The rare earth oxide is represented by a following general formula (I): R2O3??(I) where R is any one of terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium.
    Type: Grant
    Filed: June 23, 2003
    Date of Patent: December 12, 2006
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Tetsurou Tayu, Hideaki Ono, Munekatsu Shimada, Makoto Kano
  • Publication number: 20060096669
    Abstract: An anisotropic exchange spring magnet powder complexing a hard magnetic material and a soft magnetic material, wherein a rare earth metal element, a transition metal element, boron and carbon and the like are contained, and the hard magnetic material and soft magnetic material have crystal particle diameters of 150 nm or less. A method of producing an anisotropic exchange spring magnet powder comprises treating a crystalline mother material containing a hard magnetic material and soft magnetic material or the crystalline mother material having amorphous parts, in a continuous process composed of an amorphising process and the following crystallizing process, repeated once or more times. An anisotropic exchange spring magnet is obtained by treatment, in an anisotropy-imparting molding process and a solidification process, of an anisotropic exchange spring magnet powder.
    Type: Application
    Filed: December 20, 2005
    Publication date: May 11, 2006
    Applicant: Nissan Motor Co., Ltd.
    Inventors: Hideaki Ono, Norihisa Waki, Munekatsu Shimada
  • Patent number: 7018487
    Abstract: An exchange-spring magnet is prepared using a magnet alloy containing Ta and C in addition to Nd, Fe and B. This exchange-spring magnet uses the magnet alloy prepared by a liquid quenching method or a mechanical alloying method. Further, by subjecting the magnetic alloy having a part set in an amorphous state to heat treatment, an exchange-spring magnet exhibits good properties regarding magnetic flux density and coercive force.
    Type: Grant
    Filed: November 18, 2002
    Date of Patent: March 28, 2006
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Hideaki Ono, Tetsurou Tayu, Munekatsu Shimada, Makoto Kano
  • Patent number: 6984271
    Abstract: A rare earth magnet to be used in a motor. The rare earth magnet comprises rare earth magnet particles. Additionally, a rare earth oxide is present among the rare earth magnet particles, the rare earth oxide being represented by the following general formula (I): R2xR?2(1?x)O3??(I) where each of R and R? is one element selected from the group consisting of yttrium (Y), lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb) and lutetium (Lu), and 0<x<1.
    Type: Grant
    Filed: March 26, 2004
    Date of Patent: January 10, 2006
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Tetsurou Tayu, Takae Ono, legal representative, Makoto Kano, Munekatsu Shimada, Yoshio Kawashita, Takeshi Yamauchi, Hideaki Ono, deceased
  • Publication number: 20050133117
    Abstract: A rare earth magnet includes rare earth magnet particles; and amorphous and/or crystalline terbium oxide present at the boundary of the rare earth magnet particles and represented by the formula: TbOn, wherein 1.5<n?2. The rare earth magnet prevents decrease eddy current effectively.
    Type: Application
    Filed: December 21, 2004
    Publication date: June 23, 2005
    Inventors: Tetsurou Tayu, Hideaki Ono, Takae Ono, Yoshio Kawashita, Makoto Kano, Munekatsu Shimada
  • Patent number: 6891297
    Abstract: An electrical-steel-sheet formed body is provided with an opening portion into which a permanent magnet is inserted, and an outer-peripheral hardened portion formed on the electrical-steel-sheet formed body at an outer periphery side thereof for the opening portion and having a higher hardness than a remaining area of the electrical-steel-sheet formed body. The electrical-steel-sheet formed body can be used as the rotor of the built-in permanent magnet type rotary electric machine, and the built-in permanent magnet type rotary electric machine can be obtained.
    Type: Grant
    Filed: April 23, 2003
    Date of Patent: May 10, 2005
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Munekatsu Shimada, Hideaki Ono, Tetsurou Tayu, Makoto Kano, Yu Owada, Naoshi Sakata, Mitsuo Uchiyama, Toshimitsu Matsuoka, Kimihiro Shibata, Shinichiro Kitada
  • Patent number: 6800145
    Abstract: A Nd—Fe—B type rare earth magnet alloy is provided with hard magnetic phases each of which has a size equal to or less than 80 nm, soft magnetic phases each of which has a size equal to or less than 80 nm, with the hard and soft magnetic phases being present in a mixed structure, and partly anisotropic regions wherein axes of easy magnetization of the hard magnetic phases are aligned in one direction and each having a size equal to or greater than 0.1 &mgr;m. Such a magnet alloy is obtained using a strip casting method or ultra cooling method and serves as material for an anisotropic exchange spring magnet to be applied to a motor.
    Type: Grant
    Filed: May 17, 2002
    Date of Patent: October 5, 2004
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Munekatsu Shimada, Hideaki Ono
  • Publication number: 20040187963
    Abstract: A rare earth magnet to be used in a motor. The rare earth magnet comprises rare earth magnet particles.
    Type: Application
    Filed: March 26, 2004
    Publication date: September 30, 2004
    Applicant: NISSAN MOTOR CO. LTD.
    Inventors: Tetsurou Tayu, Hideaki Ono, Takae Ono, Makoto Kano, Munekatsu Shimada, Yoshio Kawashita, Takeshi Yamauchi