Patents by Inventor Yuji Nakahara
Yuji Nakahara 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: 9960644Abstract: In a core for a rotary electric machine, first end portions of back yoke portions are linked to second end portions of back yoke portions of adjacent core segments so as to be rotatable around pivot portions. Each of the core segments is configured by alternately laminating first core segment sheets and second core segment sheets. The pivot portions are constituted by interfitting protruding portions that are formed on the first core segment sheets. The core segments are displaceable relative to the adjacent core segments between a contracted position in which spacing between the magnetic pole tooth portions is contracted and an expanded position in which spacing between the magnetic pole tooth portions is expanded, when the core segment linked body is opened out rectilinearly.Type: GrantFiled: May 28, 2013Date of Patent: May 1, 2018Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Akira Hashimoto, Atsushi Sakaue, Hironori Tsuiki, Yuji Nakahara, Takashi Umeda, Katsunori Oki, Ryuichi Takiguchi, Takanori Komatsu
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Publication number: 20170077768Abstract: In a core for a rotary electric machine, first end portions of back yoke portions are linked to second end portions of back yoke portions of adjacent core segments so as to be rotatable around pivot portions. Each of the core segments is configured by alternately laminating first core segment sheets and second core segment sheets. The pivot portions are constituted by interfitting protruding portions that are formed on the first core segment sheets. The core segments are displaceable relative to the adjacent core segments between a contracted position in which spacing between the magnetic pole tooth portions is contracted and an expanded position in which spacing between the magnetic pole tooth portions is expanded, when the core segment linked body is opened out rectilinearly.Type: ApplicationFiled: May 28, 2013Publication date: March 16, 2017Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Akira HASHIMOTO, Atsushi SAKAUE, Hironori TSUIKI, Yuji NAKAHARA, Takashi UMEDA, Katsunori OKI, Ryuichi TAKIGUCHI, Takanori KOMATSU
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Patent number: 9136735Abstract: In a rotary electric machine laminated core, a rotating shaft portion is disposed closer to an outer circumferential surface than an inner circumferential surface of a back yoke portion. A notch portion is disposed on at least one of first and second end portions of the back yoke portion so as to form a gap between a vicinity of the rotating shaft portion of a projecting portion and a recess portion when core segments are arranged in an annular shape or a circular arc shape. The first end portion and the second end portion of the back yoke portion are configured such that a predetermined gap that connects from the outer circumferential side to the inner circumferential side is formed between adjacent projecting portions and recess portions when the core segments are expanded rectilinearly such that magnetic pole tooth portions are parallel to each other.Type: GrantFiled: April 8, 2010Date of Patent: September 15, 2015Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Akira Hashimoto, Yuji Nakahara, Hiroyuki Akita, Takanori Ichikawa
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Patent number: 8683675Abstract: Provided is a method for fabricating a molded stator of a rotary electric machine, the method comprising: a lamination step of laminating a plurality of core sheets each having a plurality of core pieces connected to one joining portion via bridge portions, thereby forming a divided-laminated-core group structure; a winding step of winding a coil on a teeth portion of each divided laminated core of the divided-laminated-core group structure; a cutting step of cutting the bridge portions, thereby separating the divided laminated cores wound with the coils; a temporary fixing step of temporarily fixing the divided laminated cores circularly arranged to form a stator; and a molding step of placing, in a mold, the stator into which a mold mandrel is inserted along the inner circumferential surface, and molding an outer circumferential surface of the stator with resin.Type: GrantFiled: November 19, 2009Date of Patent: April 1, 2014Assignee: Mitsubishi Electric CorporationInventors: Masahiro Yuya, Nobuaki Miyake, Yuji Nakahara, Haruyuki Hasegawa, Takenori Aomi, Fumiaki Tsuchiya, Ryoko Komaki
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Publication number: 20120248928Abstract: In a rotary electric machine laminated core, a rotating shaft portion is disposed closer to an outer circumferential surface than an inner circumferential surface of a back yoke portion. A notch portion is disposed on at least one of first and second end portions of the back yoke portion so as to form a gap between a vicinity of the rotating shaft portion of a projecting portion and a recess portion when core segments are arranged in an annular shape or a circular arc shape. The first end portion and the second end portion of the back yoke portion are configured such that a predetermined gap that connects from the outer circumferential side to the inner circumferential side is formed between adjacent projecting portions and recess portions when the core segments are expanded rectilinearly such that magnetic pole tooth portions are parallel to each other.Type: ApplicationFiled: April 8, 2010Publication date: October 4, 2012Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Akira Hashimoto, Yuji Nakahara, Hiroyuki Akita, Takanori Ichikawa
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Publication number: 20120151750Abstract: Provided is a method for fabricating a molded stator of a rotary electric machine, the method comprising: a lamination step of laminating a plurality of core sheets each having a plurality of core pieces connected to one joining portion via bridge portions, thereby forming a divided-laminated-core group structure; a winding step of winding a coil on a teeth portion of each divided laminated core of the divided-laminated-core group structure; a cutting step of cutting the bridge portions, thereby separating the divided laminated cores wound with the coils; a temporary fixing step of temporarily fixing the divided laminated cores circularly arranged to form a stator; and a molding step of placing, in a mold, the stator into which a mold mandrel is inserted along the inner circumferential surface, and molding an outer circumferential surface of the stator with resin.Type: ApplicationFiled: November 19, 2009Publication date: June 21, 2012Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Masahiro Yuya, Nobuaki Miyake, Yuji Nakahara, Haruyuki Hasegawa, Takenori Aomi, Fumiaki Tsuchiya, Ryoko Komaki
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Patent number: 8015691Abstract: A laminated core block includes a plurality of core members made of magnetic sheets stacked one on top of another, the plurality of core members including first and second core members which adjoin in a laminating direction, and a thermoplastic resin strand placed between the first and second core members. The thermoplastic resin strand is arranged to pass along one side surface of the first core member, between the first and second core members and along a side surface of the second core member on a side opposite to the aforementioned side surface of the first core member in this order. The first and second core members are bonded to each other by melting and curing the thermoplastic resin strand.Type: GrantFiled: April 4, 2011Date of Patent: September 13, 2011Assignee: Mitsubishi Electric CorporationInventors: Nobuaki Miyake, Yuji Nakahara, Masahiro Yuya, Yukinobu Karata, Akira Hashimoto
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Publication number: 20110180216Abstract: A laminated core block includes a plurality of core members made of magnetic sheets stacked one on top of another, the plurality of core members including first and second core members which adjoin in a laminating direction, and a thermoplastic resin strand placed between the first and second core members. The thermoplastic resin strand is arranged to pass along one side surface of the first core member, between the first and second core members and along a side surface of the second core member on a side opposite to the aforementioned side surface of the first core member in this order. The first and second core members are bonded to each other by melting and curing the thermoplastic resin strand.Type: ApplicationFiled: April 4, 2011Publication date: July 28, 2011Applicant: Mitsubishi Electric CorporationInventors: Nobuaki MIYAKE, Yuji NAKAHARA, Masahiro YUYA, Yukinobu KARATA, Akira HASHIMOTO
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Patent number: 7960890Abstract: A laminated core block includes a plurality of core members made of magnetic sheets stacked one on top of another, the plurality of core members including first and second core members which adjoin in a laminating direction, and a thermoplastic resin strand placed between the first and second core members. The thermoplastic resin strand is arranged to pass along one side surface of the first core member, between the first and second core members and along a side surface of the second core member on a side opposite to the aforementioned side surface of the first core member in this order. The first and second core members are bonded to each other by melting and curing the thermoplastic resin strand.Type: GrantFiled: January 12, 2009Date of Patent: June 14, 2011Assignee: Mitsubishi Electric CorporationInventors: Nobuaki Miyake, Yuji Nakahara, Masahiro Yuya, Yukinobu Karata, Akira Hashimoto
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Publication number: 20090195110Abstract: A laminated core block includes a plurality of core members made of magnetic sheets stacked one on top of another, the plurality of core members including first and second core members which adjoin in a laminating direction, and a thermoplastic resin strand placed between the first and second core members. The thermoplastic resin strand is arranged to pass along one side surface of the first core member, between the first and second core members and along a side surface of the second core member on a side opposite to the aforementioned side surface of the first core member in this order. The first and second core members are bonded to each other by melting and curing the thermoplastic resin strand.Type: ApplicationFiled: January 12, 2009Publication date: August 6, 2009Applicant: Mitsubishi Electric CorporationInventors: Nobuaki MIYAKE, Yuji Nakahara, Masahiro Yuya, Yukinobu Karata, Akira Hashimoto
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Patent number: 7551051Abstract: Radially oriented ring-shaped preliminarily molded pieces of a ring magnet are stacked in an axial direction to form a ring-shaped molded body, in which end faces of the ring-shaped preliminarily molded pieces are bonded together. This ring-shaped molded body is sintered and heat-treated to produce the ring magnet. Ring magnets which are less susceptible to deterioration of magnetic properties due to a disturbance of magnetic orientation near lamination boundary surfaces are produced. The invention provides a method of manufacturing such ring magnets with high efficiency.Type: GrantFiled: October 29, 2003Date of Patent: June 23, 2009Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshikazu Ugai, Taizo Iwami, Shuichi Takahama, Yuji Nakahara, Jinichi Furukawa
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Patent number: 7524453Abstract: An apparatus for manufacturing a ring-shaped powder compact (100) includes a ring-shaped die (80) having magnetic property formed by combining a plurality of arch-shaped members (81, 82, 83, 84), a lower core section (93) placed inside a curved inner surface of the die (80), and lower and upper punches (91, 92) for pressurizing both the die (80) and magnetic powder filled into a cavity formed between the die (80) and the lower core section (93) in an axial direction of the die (80). The curved inner surface of the die (80) varies in cross-sectional shape from one position to next along the axial direction of the die (80) at least in part along the axial direction.Type: GrantFiled: September 22, 2005Date of Patent: April 28, 2009Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshikazu Ugai, Taizo Iwami, Yuji Nakahara
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Patent number: 7347681Abstract: This invention relates to a permanent magnet molding apparatus and has as an object an improvement in productivity and reliability thereof.Type: GrantFiled: April 18, 2003Date of Patent: March 25, 2008Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshikazu Ugai, Taizo Iwami, Yuji Nakahara, Yasuo Ozeki
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Patent number: 7199492Abstract: An armature of a linear motor includes a plurality of first magnetic teeth and a plurality of second magnetic teeth, each of the magnetic teeth being formed by laminating multiple tooth elements made of electromagnetic steel sheets. The first magnetic teeth are arranged side by side in a linear form while the second magnetic teeth are located one each between the successive first magnetic teeth. Each of the second magnetic teeth interconnects the two adjacent first magnetic teeth located on both sides.Type: GrantFiled: June 18, 2004Date of Patent: April 3, 2007Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Akira Hashimoto, Yasuki Kimura, Satoshi Yamashiro, Yuji Nakahara, Akira Watarai, Michio Nakamoto
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Patent number: 7185418Abstract: The present invention relates to a structure of a stacked stator core formed when rotary motors are manufactured and to a method of manufacturing the stacked stator core. It is possible to improve the workability in the winding process and the productivity of the stator and the rotary motor because the stacked stator core includes a plurality of stator cores 300, each of which is made up of a prescribed number of stacked sheet magnetic materials, a plurality of yoke members 301 forming each stator core, a bendable bent portion 304 provided between the yoke members, and an interconnecting portion 401 for connecting the plurality of stator cores 300 one another while providing a difference in level, by connecting the top end of one stator core with the bottom end of the other stator core.Type: GrantFiled: September 30, 2003Date of Patent: March 6, 2007Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Nobuaki Miyake, Akio Matsui, Yuji Nakahara, Yasuyuki Nakanishi, Akira Hashimoto, Masaya Motohashi
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Publication number: 20060158292Abstract: Radially oriented ring-shaped preliminarily molded pieces of a ring magnet are stacked in an axial direction to form a ring-shaped molded body, in which end faces of the ring-shaped preliminarily molded pieces are bonded together. This ring-shaped molded body is sintered and heat-treated to produce the ring magnet. Ring magnets which are less susceptible to deterioration of magnetic properties due to a disturbance of magnetic orientation near lamination boundary surfaces are produced. The invention provides a method of manufacturing such ring magnet with high efficiency.Type: ApplicationFiled: October 29, 2003Publication date: July 20, 2006Applicant: Mitsubishi Denki Kabushiki KaishaInventors: Yoshikazu Ugai, Taizo Iwami, Shuichi Takahama, Yuji Nakahara, Jinichi Furukawa
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Patent number: 7073639Abstract: A rotational machine includes a shaft, a rotary member rotatably mounted on the shaft with a bearing fitted between the shaft and the rotary member, an oil seal for sealing the bearing to prevent leakage of lubricant from inside the bearing through its axial end onto a surface of the rotary member, a brake which comes into sliding contact with a contact surface area formed on the surface of the rotary member for arresting rotation of the rotary member, a supporting member fixedly mounted on the shaft face to face with the rotary member forming a gap therebetween, the gap serving as a fluid path through which the lubricant which has leaked over the oil seal is allowed to flow, and an oil stop portion formed at a location in the gap between the oil seal and the contact surface area for impeding flow of the leaked lubricant.Type: GrantFiled: July 19, 2004Date of Patent: July 11, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hitoshi Ota, Akira Hashimoto, Shinichiro Yoshida, Yuji Nakahara, Hisanori Uozumi, Naoki Hashiguchi, Naoki Kajita
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Patent number: 7019433Abstract: An armature of a rotating electric machine has a plurality of first magnetic teeth arranged side by side along a circumferential direction of the rotating electric machine and a plurality of second magnetic teeth joined to the first magnetic teeth. A pair of joint portions is formed at both end surfaces of a yoke portion of each first magnetic tooth, the joint portions formed at the facing end surfaces of the yoke portions of each successive pair of adjacent first magnetic teeth together forming a connecting part, whereas a mating part is formed at an outer end surface of each second magnetic tooth. Each second magnetic tooth is inserted between the adjacent first magnetic teeth along an axial direction of the rotating electric machine with the mating part fitted on the connecting part to interconnect the adjacent first magnetic teeth.Type: GrantFiled: March 12, 2004Date of Patent: March 28, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Akira Hashimoto, Yasuki Kimura, Satoshi Yamashiro, Yuji Nakahara, Kouki Naka, Hidetoshi Teruyama, Manabu Kobayashi
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Publication number: 20060062683Abstract: An apparatus for manufacturing a ring-shaped powder compact (100) includes a ring-shaped die (80) having magnetic property formed by combining a plurality of arch-shaped members (81, 82, 83, 84), a lower core section (93) placed inside a curved inner surface of the die (80), and lower and upper punches (91, 92) for pressurizing both the die (80) and magnetic powder filled into a cavity formed between the die (80) and the lower core section (93) in an axial direction of the die (80). The curved inner surface of the die (80) varies in cross-sectional shape from one position to next along the axial direction of the die (80) at least in part along the axial direction.Type: ApplicationFiled: September 22, 2005Publication date: March 23, 2006Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Yoshikazu Ugai, Taizo Iwami, Yuji Nakahara
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Publication number: 20060055266Abstract: A sintered ring magnet (10) is produced through processes of magnetically orienting magnetic powder by applying a magnetic field, pressing the magnetic powder and sintering a ring-shaped powder compact (30) thus formed. The sintered ring magnet (10) has a generally cylindrical outer surface with surface corrugations formed by alternating hollows (11) and protrusions (12) at regular intervals around the sintered ring magnet (10) at least in part along an axial direction thereof, wherein the sintered ring magnet (10) varies in cross-sectional shape from one position to next along the axial direction, and magnetic poles are formed along the surface corrugations with boundaries of the magnetic poles located in the hollows (11). The hollows (11) and the protrusions (12) are skewed about a longitudinal axis of the sintered ring magnet (10). The surface corrugations are shaped into a wavy pattern expressed approximately by absolute values of a sine wave.Type: ApplicationFiled: September 16, 2005Publication date: March 16, 2006Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Taizo Iwami, Yoshikazu Ugai, Yuji Nakahara