Patents by Inventor Makoto Tsukiji
Makoto Tsukiji 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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Patent number: 11901784Abstract: Provided is a stator coil, including: a coil conductor; a first insulating layer in which a first mica tape is wound and laminated around an outer periphery of the coil conductor; and a second insulating layer in which a second mica tape is wound and laminated around an outer periphery of the first insulating layer, wherein the first mica tape contains mica in a specific content, wherein 60 mass % or more of the mica contained in the first mica tape passes through a JIS standard sieve having a nominal opening of 250 ?m, wherein the first mica tape has a specific lamination thickness, and wherein 40 mass % or less of mica contained in the second mica tape passes through the JIS standard sieve having a nominal opening of 250 ?m.Type: GrantFiled: October 11, 2018Date of Patent: February 13, 2024Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Takahiro Mabuchi, Xiaohong Yin, Tsubasa Mori, Makoto Tsukiji
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Publication number: 20220209610Abstract: An object is to provide a stator coil having a corner portion with less start points for partial discharge while reducing loss. A stator coil having a conductor bar includes, at a corner portion thereof: a first insulating layer covering an outer periphery of the conductor bar; an electric conductor having one end electrically connected to the conductor bar on a distal end side of the corner portion, and another end placed on an outer surface of the first insulating layer; a first conductive layer covering an outer periphery of the first insulating layer and the electric conductor located on the outer surface of the first insulating layer; a second insulating layer covering an outer periphery of the first conductive layer; and a second conductive layer covering an outer periphery of the second insulating layer.Type: ApplicationFiled: May 22, 2019Publication date: June 30, 2022Applicant: Mitsubishi Electric CorporationInventors: Takashi FUJIWARA, Makoto TSUKIJI
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Publication number: 20210351654Abstract: Provided is a stator coil, including: a coil conductor; a first insulating layer in which a first mica tape is wound and laminated around an outer periphery of the coil conductor; and a second insulating layer in which a second mica tape is wound and laminated around an outer periphery of the first insulating layer, wherein the first mica tape contains mica in a specific content, wherein 60 mass % or more of the mica contained in the first mica tape passes through a JIS standard sieve having a nominal opening of 250 ?m, wherein the first mica tape has a specific lamination thickness, and wherein 40 mass % or less of mica contained in the second mica tape passes through the JIS standard sieve having a nominal opening of 250 ?m.Type: ApplicationFiled: October 11, 2018Publication date: November 11, 2021Applicant: Mitsubishi Electric CorporationInventors: Takahiro MABUCHI, Xiaohong YIN, Tsubasa MORI, Makoto TSUKIJI
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Patent number: 10615659Abstract: A stator coil accommodated in a slot of a rotary electric machine includes a coil conductor, a main insulating layer, a low resistance corona shield layer, and a stator coil extending outside the slot is provided with a first stator coil at the end of the low resistance corona shield layer has a first nonlinear resistance layer and a second nonlinear resistance layer partially overlapping with an end of the first nonlinear resistance layer, and a lower limit value of an electric resistivity of the second nonlinear resistance layer in a predetermined electric field is larger than an upper limit value of an electric resistivity of the first nonlinear resistance layer by one order of magnitude or more.Type: GrantFiled: November 24, 2016Date of Patent: April 7, 2020Assignee: Mitsubishi Electric CorporationInventors: Takahiro Umemoto, Yasutomo Otake, Manabu Yoshimura, Takashi Nada, Makoto Tsukiji
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Publication number: 20190109507Abstract: A stator coil accommodated in a slot of a rotary electric machine includes a coil conductor, a main insulating layer, a low resistance corona shield layer, and a stator coil extending outside the slot is provided with a first stator coil at the end of the low resistance corona shield layer has a first nonlinear resistance layer and a second nonlinear resistance layer partially overlapping with an end of the first nonlinear resistance layer, and a lower limit value of an electric resistivity of the second nonlinear resistance layer in a predetermined electric field is larger than an upper limit value of an electric resistivity of the first nonlinear resistance layer by one order of magnitude or more.Type: ApplicationFiled: November 24, 2016Publication date: April 11, 2019Applicant: Mitsubishi Electric CorporationInventors: Takahiro UMEMOTO, Yasutomo OTAKE, Manabu YOSHIMURA, Takashi NADA, Makoto TSUKIJI
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Patent number: 10199136Abstract: An insulating tape having a mica layer, a reinforcing layer having a filler and a fiber reinforcing material laminated on the mica layer, and a cellulose derivative layer laminated on the reinforcing layer is provided. One or more hydroxyl groups in the glucose units of the cellulose derivative are substituted with a functional group such as —CH2CH2OH or —(CH2CH2O)pH (where p is any repeating number up to 50). The weight per unit area of the mica ranges from 100 g/m2 to 200 g/m2. The filler has a maximum particle size of 100 ?m or smaller and a weight per unit area ranging from 10 g/m2 to 50 g/m2. The insulating tape is useful to form a stator coil insulating layer with high thermal conductivity, with no outflow of a filler to the exterior during production of the stator coil, and with enhanced bonding strength.Type: GrantFiled: November 13, 2014Date of Patent: February 5, 2019Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Takahiro Mabuchi, Shigeyuki Yamamoto, Makoto Tsukiji, Hiroshi Sako
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Patent number: 9925744Abstract: An insulating tape including: a mica layer containing mica; a reinforcing layer that is laminated onto the mica layer and contains a filler and a fibrous reinforcing material; and a flat sheet layer that is laminated onto the reinforcing layer and contains flat sheet-shaped inorganic particles having an aspect ratio of at least 30. In this insulating tape, the filler is supported in advance, and does not therefore flow out during manufacture of a stator coil, for example during hot-pressing. As a result, an insulating coating exhibiting high thermal conductivity can be formed.Type: GrantFiled: December 11, 2013Date of Patent: March 27, 2018Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Takahiro Mabuchi, Shigeyuki Yamamoto, Makoto Tsukiji, Hiroshi Sako
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Publication number: 20160329123Abstract: The insulating tape of the present invention includes a mica layer containing mica, a reinforcing layer laminated on the mica layer and containing a filler and a fiber reinforcing material, and a cellulose derivative layer laminated on the reinforcing layer. The cellulose derivative layer contains a cellulose derivative in which one or more hydroxyl groups in the glucose units are substituted with a functional group such as —CH2CH2OH or —(CH2CH2O)pH (in the formula, p is any repeating number greater than 0 up to 50). The weight per unit area of the mica ranges from 100 g/m2 to 200 g/m2. The filler has a maximum particle size of 100 ?m or smaller and a weight per unit area ranging from 10 g/m2 to 50 g/m2.Type: ApplicationFiled: November 13, 2014Publication date: November 10, 2016Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Takahiro MABUCHI, Shigeyuki YAMAMOTO, Makoto TSUKIJI, Hiroshi SAKO
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Publication number: 20150273800Abstract: An insulating tape including: a mica layer containing mica; a reinforcing layer that is laminated onto the mica layer and contains a filler and a fibrous reinforcing material; and a flat sheet layer that is laminated onto the reinforcing layer and contains flat sheet-shaped inorganic particles having an aspect ratio of at least 30. In this insulating tape, the filler is supported in advance, and does not therefore flow out during manufacture of a stator coil, for example during hot-pressing. As a result, an insulating coating exhibiting high thermal conductivity can be formed.Type: ApplicationFiled: December 11, 2013Publication date: October 1, 2015Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Takahiro Mabuchi, Shigeyuki Yamamoto, Makoto Tsukiji, Hiroshi Sako
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Publication number: 20140327335Abstract: An electromagnetic coil having an insulating coating formed by alternately laminating, on a coil conductor, a mica layer including mica and a reinforcing layer including fiber reinforcing material, inorganic particles and resin, wherein the inorganic particles include secondary agglomerate particles formed by agglomeration of primary particles of hexagonal crystal boron nitride. The electromagnetic coil is provided with an insulating coating that suppresses external outflow of inorganic particles and ensures favorable thermal conductivity. Furthermore, the invention also provides an insulating tape having a mica layer including mica and a reinforcing layer including fiber reinforcing material, inorganic particles and resin, which is layered on the mica layer, wherein the inorganic particles include secondary agglomerate particles formed by agglomeration of primary particles of hexagonal crystal boron nitride.Type: ApplicationFiled: November 12, 2012Publication date: November 6, 2014Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Takahiro Mabuchi, Shigeyuki Yamamoto, Makoto Tsukiji, Kazuki Kubo
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Patent number: 6189322Abstract: A refrigerant-circulating system which comprises a refrigeration cycle comprising a refrigerant compressor, a condenser, an expansion mechanism and an evaporator to form a refrigerant circuit and employing a refrigerant which contains no chlorine, wherein an aromatic polyether oil having as a base oil structure a benzene ring having an ether bond is employed as a refrigerator oil.Type: GrantFiled: March 11, 1999Date of Patent: February 20, 2001Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Keisaku Ishihara, Yoshinori Shirafuji, Shin Sekiya, Noboru Masuda, Takeshi Izawa, Hideto Nakao, Makoto Tsukiji, Shinsuke Miki
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Patent number: 6130496Abstract: A stator coil for a rotating electrical machine having a ground wall insulation of a stator coil impregnated with a resin, maintaining a releasing characteristic between the ground wall insulation and a slot of a stator core, preventing surface corona and exhibiting excellent characteristics for a long time. The stator coil of the rotating electrical machine has a conductor covered with an insulating layer and a surface-corona preventive layer, the stator coil being accommodated in the slot of a stator core and, together with the stator core, impregnated with a thermosetting resin so that the stator coil is integrated with the stator core. The surface-corona preventive layer has a wound semiconductive tape and a composite tape including a fluorine-containing non-bonding material layer on a second semiconductive tape.Type: GrantFiled: July 27, 1999Date of Patent: October 10, 2000Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hideki Takigawa, Wataru Bitou, Makoto Tsukiji, Hiroki Shiota, Shiro Takada, Nobuo Urakawa