Patents by Inventor Yuichi Satsu
Yuichi Satsu 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).
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Publication number: 20220042157Abstract: A soft magnetic material that is sheet-shaped or foil-shaped and has a high saturation magnetic flux density, contains iron, carbon, and nitrogen, and includes a martensite containing carbon and nitrogen, and ?-Fe, wherein the ?-Fe includes a nitrogen-containing phase. The soft magnetic material is produced by steps of heating an iron-based material that is sheet-shaped or foil-shaped, carburizing the iron-based material with a carburizing gas, dispersing a granular carbide in ?-Fe in the iron-based material at a temperature equal to or lower than a eutectoid temperature, transforming the ?-Fe into ?-Fe at a temperature higher than the eutectoid temperature, diffusing nitrogen into the ?-Fe using a nitrogen supply gas to form ?-Fe—N—C, and rapidly heating and then rapidly cooling the ?-Fe—N—C to transform the ?-Fe—N—C into a martensite. The result is a thermally stable soft magnetic material having a saturation magnetic flux density higher than that of pure iron.Type: ApplicationFiled: September 11, 2019Publication date: February 10, 2022Inventors: Matahiro KOMURO, Yuichi SATSU, Hisamitsu HATOU, Seunghwan PARK
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Publication number: 20210272727Abstract: Provided are: a sintered magnet having an improved maximum energy product while maintaining the magnetic coercivity of the magnet; and a production method for such a sintered magnet. The sintered magnet (10a) according to the present invention comprises particles (6) each including: a main phase (2) in which the main component is a compound containing a rare-earth element and iron; and a diffusion layer (1) provided on the surface of the main phase (2). The diffusion layers (1) are characterized by: containing, as a main component, a compound resulting from a solid-solution of carbon and/or nitrogen in said compound of the main phase (2); and having a concentration gradient of carbon and/or nitrogen from the surfaces of the particles (6) toward the interior thereof.Type: ApplicationFiled: March 8, 2019Publication date: September 2, 2021Applicant: Hitachi, Ltd.Inventors: Matahiro KOMURO, Yuichi SATSU
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Patent number: 10714941Abstract: To provide an energy management system that effectively uses a solar power generation system and a solar heat collection system to thereby make it possible to maximize a cost merit of a user. An energy management system related to the present invention includes: a solar power generation system that includes a solar panel to generate electric power on the basis of a solar light; a solar heat collection system that collects solar heat based on the solar light; and a control part that determines whether or not heat can be stored by the solar heat collection system from output characteristics of the solar power generation system and that drives the solar heat collection system in a case where the heat can be stored.Type: GrantFiled: October 15, 2018Date of Patent: July 14, 2020Assignee: HITACHI LTD.Inventors: Naoki Yoshimoto, Yuichi Satsu
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Publication number: 20190148946Abstract: To provide an energy management system that effectively uses a solar power generation system and a solar heat collection system to thereby make it possible to maximize a cost merit of a user. An energy management system related to the present invention includes: a solar power generation system that includes a solar panel to generate electric power on the basis of a solar light; a solar heat collection system that collects solar heat based on the solar light; and a control part that determines whether or not heat can be stored by the solar heat collection system from output characteristics of the solar power generation system and that drives the solar heat collection system in a case where the heat can be stored.Type: ApplicationFiled: October 15, 2018Publication date: May 16, 2019Applicant: HITACHI, LTD.Inventors: Naoki YOSHIMOTO, Yuichi SATSU
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Patent number: 9373432Abstract: The purpose of the present invention is to provide an alcoholic solvent, in which FeCo-based particles becoming a soft magnet are improved, for enhancing properties of a magnetic material using no heavy rare earth elements, and is to provide a sintered magnet produced by using it.Type: GrantFiled: November 15, 2012Date of Patent: June 21, 2016Assignee: Hitachi Chemical Company, Ltd.Inventors: Nobuo Abe, Yuichi Satsu, Matahiro Komuro, Takayuki Kanda
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Patent number: 9129731Abstract: Disclosed is a sintered magnet which is a rare-earth magnet using a less amount of a rare-earth element but having a higher maximum energy product and a higher coercivity. The sintered magnet includes a NdFeB crystal; and an FeCo crystal adjacent to the NdFeB crystal through the medium of a grain boundary. The FeCo crystal includes a core and a periphery and has a cobalt concentration decreasing from the core to the periphery. The FeCo crystal has a difference in cobalt concentration of 2 atomic percent or more between the core and the periphery. In the NdFeB crystal, cobalt and a heavy rare-earth element are unevenly distributed and enriched in the vicinity of the grain boundary.Type: GrantFiled: August 13, 2012Date of Patent: September 8, 2015Assignee: Hitachi, Ltd.Inventors: Matahiro Komuro, Yuichi Satsu, Isao Kitagawa, Akira Sugawara
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Publication number: 20150170809Abstract: The purpose of the present invention is to improve the magnetic characteristics of a sintered magnet without any additional heavy rare earth element. A sintered magnet composed of an NdFeB main phase and a grain boundary phase, wherein; the grain boundary phase contains an oxyfluoride; the concentration of fluorine in the oxyfluoride is higher than that of oxygen therein; the concentration of fluorine in the oxyfluoride decreases depthwise from the surface of the sintered magnet toward the center thereof; and the saturation magnetic flux density of the sintered magnet decreases depthwise from the surface of the sintered magnet toward the center thereof.Type: ApplicationFiled: May 30, 2012Publication date: June 18, 2015Applicant: HITACHI, LTD.Inventors: Matahiro Komuro, Yuichi Satsu, Takao Imagawa
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Publication number: 20150162117Abstract: The purpose of the present invention is to improve the magnetic characteristics of a sintered magnet without adding a supplementary heavy rare earth element.Type: ApplicationFiled: June 13, 2012Publication date: June 11, 2015Applicant: HITACHI, LTD.Inventors: Matahiro Komuro, Yuichi Satsu, Takao Imagawa
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Patent number: 8821649Abstract: Characteristics of a magnetic material are improved without using a heavy rare earth element as a scarce resource. By incorporating fluorine into a magnetic powder and controlling the crystal orientation in crystal grains, a magnetic material securing magnetic characteristics such as coercive force and residual flux density can be fabricated. As a result, the resource problem with heavy rare earth elements can be solved, and the magnetic material can be applied to magnetic circuits that require a high energy product, including various rotating machines and voice coil motors of hard discs.Type: GrantFiled: February 17, 2011Date of Patent: September 2, 2014Assignee: Hitachi, Ltd.Inventors: Takayuki Kanda, Matahiro Komuro, Hiroyuki Suzuki, Yuichi Satsu
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Patent number: 8764917Abstract: A ferromagnetic compound magnet in accordance with the present invention includes a ferromagnetic compound based on a binary alloy containing R—Fe system (R is a 4f transition element or Y) or a ternary allay containing R—Fe-T system (R is a 4f transition element or Y, and T is a 3d transition element except for Fe, or Mo, Nb or W), the ferromagnetic compound being characterized by: atomic percentage of the element R to the element Fe or to the elements Fe and T is 15% or lower; an element F is incorporated into an interstitial position in a crystal lattice of the alloy. The ferromagnetic compound is expressed in a chemical formula of: R2Fe17Fx; R2(Fe,T)17Fx; R3Fe29Fy; R3(Fe,T)29Fy; RFe12Fz; or R(Fe,T)12Fz (0<x?3, 0<y?4, 0<z?1).Type: GrantFiled: November 30, 2010Date of Patent: July 1, 2014Assignee: Hitachi, Ltd.Inventors: Hiroyuki Suzuki, Matahiro Komuro, Yuichi Satsu, Takao Imagawa
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Publication number: 20130278104Abstract: The present invention makes it possible to increase the residual magnetic flux density and the coercive force of a rare earth magnet; and raise the Curie temperature. In a magnet formed by compressing magnetic particles, the surface of a magnetic particle is covered with a metal fluoride film, the magnetic particle has a crystal structure containing a homo portion formed by bonding adjacent iron atoms and a hetero portion formed by bonding two iron atoms via an atom other than iron, and the distance between the two iron atoms in the hetero portion is different from the distance between the adjacent iron atoms in the homo portion.Type: ApplicationFiled: June 24, 2013Publication date: October 24, 2013Inventors: Matahiro KOMURO, Yuichi SATSU, Hiroyuki SUZUKI
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Publication number: 20130069746Abstract: Disclosed is a sintered magnet which is a rare-earth magnet using a less amount of a rare-earth element but having a higher maximum energy product and a higher coercivity. The sintered magnet includes a NdFeB crystal; and an FeCo crystal adjacent to the NdFeB crystal through the medium of a grain boundary. The FeCo crystal includes a core and a periphery and has a cobalt concentration decreasing from the core to the periphery. The FeCo crystal has a difference in cobalt concentration of 2 atomic percent or more between the core and the periphery. In the NdFeB crystal, cobalt and a heavy rare-earth element are unevenly distributed and enriched in the vicinity of the grain boundary.Type: ApplicationFiled: August 13, 2012Publication date: March 21, 2013Applicant: Hitachi, Ltd.Inventors: Matahiro KOMURO, Yuichi Satsu, Isao Kitagawa, Akira Sugawara
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Patent number: 8388769Abstract: To mold a high-resistance magnet at low temperature, including room temperature, the magnet includes magnetic powders, metallic powders having a lower hardness than the magnetic powders and a high-resistance layer, wherein the magnetic powders occupy a larger volume than the metallic powders. In particular, the high-resistance layer contains a fluorine compound and is placed between the magnetic powder and the metallic powders.Type: GrantFiled: December 19, 2006Date of Patent: March 5, 2013Assignee: Hitachi, Ltd.Inventors: Matahiro Komuro, Yuichi Satsu, Takashi Yasuhara
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Patent number: 8358040Abstract: A permanent magnet type electric rotating machine having a high resistance permanent magnet used for the electric rotating machine, the permanent magnet containing a magnetic powder and a fluorine compound, in which the current waveform is controlled for reducing the loss to satisfy a relation: A<C<B and restrict the 7th higher-harmonic component to 20% or less where A is the content for the 5th higher harmonic component, B is the content for the 7th higher harmonic component, and C is the content for the 11th higher harmonic component, assuming the total of contents for the fundamental components of a current supplied to the findings being 100%.Type: GrantFiled: February 17, 2006Date of Patent: January 22, 2013Assignee: Hitachi, Ltd.Inventors: Matahiro Komuro, Yuichi Satsu, Haruo Koharagi, Yuji Enomoto
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Patent number: 8350430Abstract: An R—Fe—B sintered magnet has a structure including main phase crystal grains and a grain boundary area surrounding the crystal grains. The sintered magnet includes fluorine and a specified metal element selected from elements belonging to Group 2 through Group 16 of periodic table excepting the rare earth element, carbon and boron. The fluorine has a higher concentration in a region closer to a magnet surface than in the center. The specified element also has a higher concentration in the region closer to the surface. The sintered magnet includes oxyfluoride containing carbon, Dy and the metal element in a grain boundary area region at a distance of 1 ?m or greater from the magnet surface, and the carbon has a higher concentration than the concentration of the metal element in a region at a distance of 1 ?m to 500 ?m from the magnet surface.Type: GrantFiled: April 23, 2012Date of Patent: January 8, 2013Assignee: Hitachi, Ltd.Inventors: Matahiro Komuro, Yuichi Satsu, Yoshii Morishita, Shigeaki Funyu, Mitsuo Katayose
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Patent number: 8303732Abstract: 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 ?m 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.Type: GrantFiled: January 29, 2010Date of Patent: November 6, 2012Assignee: Hitachi, Ltd.Inventors: Hiroyuki Suzuki, Takao Imagawa, Yuichi Satsu, Matahiro Komuro
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Publication number: 20120205573Abstract: An R—Fe—B sintered magnet has a structure including main phase crystal grains and a grain boundary area surrounding the crystal grains. The sintered magnet includes fluorine and a specified metal element selected from elements belonging to Group 2 through Group 16 of periodic table excepting the rare earth element, carbon and boron. The fluorine has a higher concentration in a region closer to a magnet surface than in the center. The specified element also has a higher concentration in the region closer to the surface. The sintered magnet includes oxyfluoride containing carbon, Dy and the metal element in a grain boundary area region at a distance of 1 ?m or greater from the magnet surface, and the carbon has a higher concentration than the concentration of the metal element in a region at a distance of 1 ?m to 500 ?m from the magnet surface.Type: ApplicationFiled: April 23, 2012Publication date: August 16, 2012Applicant: Hitachi, Ltd.Inventors: Matahiro KOMURO, Yuichi Satsu, Yoshii Morishita, Shigeaki Funyu, Mitsuo Katayose
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Patent number: 8226779Abstract: A manufacturing method of a magnetic core includes a first step of applying a treatment liquid for forming an insulating film to iron powder; a second step of heat-treating the iron powder to which the treatment liquid has been applied, at a temperature higher than 350 degrees; a third step of compacting the heat-treated iron powder to form a magnetic core; and a forth step of heat-treating the magnetic core at a temperature ranging from 600 degrees to 800 degrees.Type: GrantFiled: April 9, 2008Date of Patent: July 24, 2012Assignee: Hitachi, Ltd.Inventors: Takao Imagawa, Yuichi Satsu, Matahiro Komuro, Hiroyuki Suzuki
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Patent number: 8222785Abstract: 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 %.Type: GrantFiled: June 27, 2011Date of Patent: July 17, 2012Assignee: Hitachi, Ltd.Inventors: Matahiro Komuro, Yuichi Satsu, Takao Imagawa
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Publication number: 20120175986Abstract: In a ferromagnetic material containing at least one kind of rare-earth element, a layer containing at least one kind of alkaline earth element or rare-earth element and fluorine is formed at the grain boundary or near the powder surface of the ferromagnetic material. A further layer containing at least one kind of rare-earth element, having a fluorine concentration lower than that of the layer described first and having a rare-earth element concentration higher than that of the host phase of the ferromagnetic material, or an oxide layer containing a rare-earth element is formed in adjacent with a portion of the layer described first.Type: ApplicationFiled: January 10, 2012Publication date: July 12, 2012Inventors: Matahiro Komuro, Yuichi Satsu, Kunihiro Maeda, Yuzo Kozono