Patents by Inventor Kensaku Kuroki
Kensaku Kuroki 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: 11843289Abstract: In a method for manufacturing a core element which is used for a divisional layer stack core of a rotary electric machine, the method includes: a first punch cutting out process for punch cutting out a first core element having a product shape, from a belt like electromagnetic steel sheet, with a press mechanism which has a feeding device of the electromagnetic steel sheet, a feeding process for feeding the electromagnetic steel sheet, with the feeding device, and a second punch cutting out process for positioning with a product shaped pilot which has an external shape of the core element, using a punch cut out trace shape of the first core element, and producing a second core element having the product shape, by punch cutting out with the press mechanism.Type: GrantFiled: June 17, 2021Date of Patent: December 12, 2023Assignee: Mitsubishi Electric CorporationInventors: Akihito Mori, Naoya Hashimoto, Kiyoshi Nakano, Kazuya Hasegawa, Norihiro Murata, Tomoyuki Kinoshita, Kensaku Kuroki
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Publication number: 20220109354Abstract: In a method for manufacturing a core element which is used for a divisional layer stack core of a rotary electric machine, the method includes: a first punch cutting out process for punch cutting out a first core element having a product shape, from a belt like electromagnetic steel sheet, with a press mechanism which has a feeding device of the electromagnetic steel sheet, a feeding process for feeding the electromagnetic steel sheet, with the feeding device, and a second punch cutting out process for positioning with a product shaped pilot which has an external shape of the core element, using a punch cut out trace shape of the first core element, and producing a second core element having the product shape, by punch cutting out with the press mechanism.Type: ApplicationFiled: June 17, 2021Publication date: April 7, 2022Applicant: Mitsubishi Electric CorporationInventors: Akihito MORI, Naoya HASHIMOTO, Kiyoshi NAKANO, Kazuya HASEGAWA, Norihiro MURATA, Tomoyuki KINOSHITA, Kensaku KUROKI
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Patent number: 8686610Abstract: The present invention provides an automotive dynamoelectric stator that enables vibration resistance of a lead portion to be ensured and reductions in area of the lead portion and a coil end group that is exposed to a cooling airflow to be suppressed without increasing work or cost. In a dynamoelectric machine according to the present invention, first lead portions that connect a plurality of windings to configure phase windings are each led axially outward from a rear-end coil end group, and then disposed so as to extend parallel to an axially outer peripheral surface of the rear-end coil end group so as to cross at least one other first lead portion, and so as to be separated from the axially outer peripheral surface of the rear-end coil end group.Type: GrantFiled: July 1, 2008Date of Patent: April 1, 2014Assignee: Mitsubishi Electric CorporationInventors: Shogo Okamoto, Shinji Nishimura, Shiro Iizuka, Yoshiro Imazawa, Ken Nishikawa, Michiya Yasui, Kensaku Kuroki, Yoshihiro Harada, Naoya Nishikawa
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Patent number: 8115362Abstract: An alternator can reduce the size of welding equipment and shorten the time of welding operation while ensuring high performance and high quality with the generation of electromagnetic noise being suppressed. The alternator includes a rotor having N poles and S poles alternately formed along a circumferential direction thereof, a stator core arranged so as to surround the rotor and having a plurality of axially extending slots formed at a predetermined pitch in the circumferential direction thereof, and a stator having a stator winding fitted into the slots. The stator core is formed by deforming by bending a hexahedral element iron core composed of iron core blocks with their adjacent ends being in abutment with each other and fusion bonded by welding. The weld portions of the blocks have a depth fusion extending at least up to a tensile region where a tensile stress of the stator core is generated.Type: GrantFiled: April 2, 2007Date of Patent: February 14, 2012Assignee: Mitsubishi Electric CorporationInventors: Shogo Okamoto, Kensaku Kuroki, Tetsuya Amasaki, Shoichiro Nishitani
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Patent number: 8042256Abstract: Respective divided segments of a collet are moved radially outward by moving an arbor axially. The respective divided segments thereby press an inner circumferential surface of a stator core of a stator from radially inside such that the stator is held coaxially by the collet. Next, shaping rollers are lowered so as to press an outer circumferential surface of the stator core. The stator is rotated by rotating the collet in that state. Thus, the inner circumferential surface of the stator core is compressed and plastically deformed so as to conform to the collet and the outer circumferential surface of the stator core is compressed and plastically deformed by the shaping rollers, correcting the inner circumferential surface and the outer circumferential surface of the stator core so as to be coaxial and so as to have a high degree of roundness.Type: GrantFiled: March 1, 2011Date of Patent: October 25, 2011Assignee: Mitsubishi Electric CorporationInventors: Yoshihiro Harada, Toshiaki Kashihara, Kensaku Kuroki, Yasukazu Nishimura, Shogo Okamoto, Shinji Nishimura
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Publication number: 20110146058Abstract: Respective divided segments of a collet are moved radially outward by moving an arbor axially. The respective divided segments thereby press an inner circumferential surface of a stator core of a stator from radially inside such that the stator is held coaxially by the collet. Next, shaping rollers are lowered so as to press an outer circumferential surface of the stator core. The stator is rotated by rotating the collet in that state. Thus, the inner circumferential surface of the stator core is compressed and plastically deformed so as to conform to the collet and the outer circumferential surface of the stator core is compressed and plastically deformed by the shaping rollers, correcting the inner circumferential surface and the outer circumferential surface of the stator core so as to be coaxial and so as to have a high degree of roundness.Type: ApplicationFiled: March 1, 2011Publication date: June 23, 2011Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Yoshihiro HARADA, Toshiaki Kashihara, Kensaku Kuroki, Yasukazu Nishimura, Shogo Okamoto, Shinji Nishimura
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Publication number: 20110109178Abstract: The present invention provides an automotive dynamoelectric stator that enables vibration resistance of a lead portion to be ensured and reductions in area of the lead portion and a coil end group that is exposed to a cooling airflow to be suppressed without increasing work or cost. In a dynamoelectric machine according to the present invention, first lead portions that connect a plurality of windings to configure phase windings are each led axially outward from a rear-end coil end group, and then disposed so as to extend parallel to an axially outer peripheral surface of the rear-end coil end group so as to cross at least one other first lead portion, and so as to be separated from the axially outer peripheral surface of the rear-end coil end group.Type: ApplicationFiled: July 1, 2008Publication date: May 12, 2011Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Shogo Okamoto, Shinji Nishimura, Shiro Iizuka, Yoshiro Imazawa, Ken Nishikawa, Michiya Yasui, Kensaku Kuroki, Yoshihiro Harada, Naoya Nishikawa
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Patent number: 7728480Abstract: The stator core is configured into a cylindrical shape by abutting a laminated core that is obtained by bending and forming a rectangular parallelepiped lamination and integrating the stator core by welding. The lamination is configured by laminating a predetermined number of thin strip-shaped magnetic plates that are formed so as to have a flat rectangular shape, and in addition at least two thin sheet coupling weld portions that integrate the predetermined number of thin strip-shaped magnetic plates by welding are formed so as to extend from a first end to a second end in a direction of lamination on an outer wall surface of the lamination and so as to have a predetermined spacing in a longitudinal direction of the lamination. The stator core is formed such that an axial length A at the thin sheet coupling weld portions and a maximum axial length B between the thin sheet coupling weld portions satisfy an expression: 0.0 mm?B·A?0.2 mm.Type: GrantFiled: April 12, 2007Date of Patent: June 1, 2010Assignee: Mitsubishi Electric CorporationInventors: Shogo Okamoto, Hiroya Ikuta, Yoshihiro Harada, Naohiko Harada, Kensaku Kuroki
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Publication number: 20080179986Abstract: Respective divided segments of a collet are moved radially outward by moving an arbor axially. The respective divided segments thereby press an inner circumferential surface of a stator core of a stator from radially inside such that the stator is held coaxially by the collet. Next, shaping rollers are lowered so as to press an outer circumferential surface of the stator core. The stator is rotated by rotating the collet in that state. Thus, the inner circumferential surface of the stator core is compressed and plastically deformed so as to conform to the collet and the outer circumferential surface of the stator core is compressed and plastically deformed by the shaping rollers, correcting the inner circumferential surface and the outer circumferential surface of the stator core so as to be coaxial and so as to have a high degree of roundness.Type: ApplicationFiled: July 26, 2007Publication date: July 31, 2008Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Yoshihiro HARADA, Toshiaki KASHIHARA, Kensaku KUROKI, Yasukazu NISHIMURA, Shogo OKAMOTO, Shinji NISHIMURA
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Publication number: 20080111443Abstract: An alternator can reduce the size of welding equipment and shorten the time of welding operation while ensuring high performance and high quality with the generation of electromagnetic noise being suppressed. The alternator includes a rotor having N poles and S poles alternately formed along a circumferential direction thereof, a stator core arranged so as to surround the rotor and having a plurality of axially extending slots formed at a predetermined pitch in the circumferential direction thereof, and a stator having a stator winding fitted into the slots. The stator core is formed by deforming by bending a hexahedral element iron core composed of iron core blocks with their adjacent ends being in abutment with each other and fusion bonded by welding. The weld portions of the blocks have a depth fusion extending at least up to a tensile region where a tensile stress of the stator core is generated.Type: ApplicationFiled: April 2, 2007Publication date: May 15, 2008Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Shogo Okamoto, Kensaku Kuroki, Tetsuya Amasaki, Shoichiro Nishitani
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Publication number: 20080088197Abstract: The stator core is configured into a cylindrical shape by abutting a laminated core that is obtained by bending and forming a rectangular parallelepiped lamination and integrating the stator core by welding. The lamination is configured by laminating a predetermined number of thin strip-shaped magnetic plates that are formed so as to have a flat rectangular shape, and in addition at least two thin sheet coupling weld portions that integrate the predetermined number of thin strip-shaped magnetic plates by welding are formed so as to extend from a first end to a second end in a direction of lamination on an outer wall surface of the lamination and so as to have a predetermined spacing in a longitudinal direction of the lamination. The stator core is formed such that an axial length A at the thin sheet coupling weld portions and a maximum axial length B between the thin sheet coupling weld portions satisfy an expression: 0.0 mm?B·A?0.2 mm.Type: ApplicationFiled: April 12, 2007Publication date: April 17, 2008Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Shogo Okamoto, Hiroya Ikuta, Yoshihiro Harada, Naohiko Harada, Kensaku Kuroki
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Patent number: 7260880Abstract: A method of manufacturing a stator core for a dynamo-electric machine by preparing a cylindrical laminated body by winding into a helical shape a continuous first sheet formed by press-punching from a strip-shaped first magnetic steel sheet material, preparing a plurality of second sheets by press-punching from a thicker second magnetic steel sheet material, bending the second sheets into an annular shape and stacking the second sheets bent into the annular shape on both axial ends of the laminated body and integrating the stacked sheets by laser welding.Type: GrantFiled: February 16, 2006Date of Patent: August 28, 2007Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshihiro Harada, Susumu Hatano, Kensaku Kuroki, Atsushi Oohashi
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Patent number: 7260881Abstract: A method of manufacturing a stator core for a dynamo-electric machine, by preparing a cylindrical laminated body by winding into a helical shape a continuous first sheet formed by press-punching from a first magnetic steel sheet material. Preparing a plurality of second sheets having a predetermined length by press-punching from a thicker second magnetic steel sheet material. Next, chamfered portions are formed on edge portions of second recess portions by chamfering the second sheet. Then, the second sheets are bent into an annular shape and the second sheets bent into the annular shape are stacked on both axial ends of the laminated body and integrated by laser welding.Type: GrantFiled: February 16, 2006Date of Patent: August 28, 2007Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshihiro Harada, Susumu Hatano, Kensaku Kuroki, Atsushi Oohashi
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Publication number: 20060130313Abstract: A cylindrical laminated body is prepared by winding into a helical shape a continuous first sheet formed by press-punching from a thin first magnetic steel sheet material. A second sheet having a predetermined length is prepared by press-punching from a thicker second magnetic steel sheet material. Next, chamfered portions are formed on edge portions of second recess portions by chamfering the second sheet. Then, the second sheet is bent into an annular shape and the second sheets bent into the annular shape are stacked on both axial ends of the laminated body and integrated by laser welding.Type: ApplicationFiled: February 16, 2006Publication date: June 22, 2006Inventors: Yoshihiro Harada, Susumu Hatano, Kensaku Kuroki, Atsushi Oohashi
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Publication number: 20060130314Abstract: A cylindrical laminated body is prepared by winding into a helical shape a continuous first sheet formed by press-punching from a thin first magnetic steel sheet material. A second sheet having a predetermined length is prepared by press-punching from a thicker second magnetic steel sheet material. Next, chamfered portions are formed on edge portions of second recess portions by chamfering the second sheet. Then, the second sheet is bent into an annular shape and the second sheets bent into the annular shape are stacked on both axial ends of the laminated body and integrated by laser welding.Type: ApplicationFiled: February 16, 2006Publication date: June 22, 2006Inventors: Yoshihiro Harada, Susumu Hatano, Kensaku Kuroki, Atsushi Oohashi
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Patent number: 7012351Abstract: An alternator includes a stator having a stator core in which a plurality of slots are formed so as to line up in a circumferential direction on an inner peripheral wall surface, and a stator winding configured such that conducting wires are installed in the slots; and a rotor rotatably disposed inside the stator, having a field winding, a pair of pole cores each having a plurality of claw-shaped magnetic poles that alternately intermesh with each other disposed so as to cover the field winding, and a fan disposed on an axial end surface of at least one of the pole cores, air flows together with rotation of the rotor in stepped portions between teeth partitioning the slots, and an inclined portion bent in a circumferential direction of the stator is formed on at least one of the teeth on at least one end portion among first and second axial end portions of the teeth.Type: GrantFiled: April 7, 2005Date of Patent: March 14, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshiaki Kashihara, Shogo Okamoto, Norihiro Murata, Kensaku Kuroki
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Publication number: 20060033396Abstract: An alternator includes a stator having a stator core in which a plurality of slots are formed so as to line up in a circumferential direction on an inner peripheral wall surface, and a stator winding configured such that conducting wires are installed in the slots; and a rotor rotatably disposed inside the stator, having a field winding, a pair of pole cores each having a plurality of claw-shaped magnetic poles that alternately intermesh with each other disposed so as to cover the field winding, and a fan disposed on an axial end surface of at least one of the pole cores, air flows together with rotation of the rotor in stepped portions between teeth partitioning the slots, and an inclined portion bent in a circumferential direction of the stator is formed on at least one of the teeth on at least one end portion among first and second axial end portions of the teeth.Type: ApplicationFiled: April 7, 2005Publication date: February 16, 2006Inventors: Toshiaki Kashihara, Shogo Okamoto, Norihiro Murata, Kensaku Kuroki
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Patent number: 6979930Abstract: A stator core is constructed by laminating and integrating first and second core divisions with the press punch directions thereof facing each other, each core division being constructed by winding a single strip of magnetic steel sheet into a helical shape with the press punch direction thereof aligned.Type: GrantFiled: April 10, 2002Date of Patent: December 27, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshihiro Harada, Kensaku Kuroki, Atsushi Oohashi
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Patent number: 6921863Abstract: In case of manufacturing a winding member, it has been necessary to first strip off a coating of an electric wire, and thereafter to perform machining so that an end portion of the electric wire is tapered. Hence, the manufacturing process is complicated and manufacturing cost is high. In the invention, a part of an electric wire 150 that includes a first conductor 112 and a coating 116 is extended to form a second conductor 120. The coating 116 is stripped off by itself due to this extension step. Thereafter, the extended second conductor is cut in the middle thereby forming an electric wire for a winding member 100. This electric wire is formed into a predetermined shape such as U-shape to obtain the winding member 100. As a result, stripping off the coating can be omitted, thus improving working efficiency and enabling reduction in cost.Type: GrantFiled: November 3, 2003Date of Patent: July 26, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Atsushi Oohashi, Kensaku Kuroki
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Publication number: 20040221443Abstract: In case of manufacturing a winding member, it has been necessary to first strip off a coating of an electric wire, and thereafter to perform machining so that an end portion of the electric wire is tapered. Hence, the manufacturing process is complicated and manufacturing cost is high. In the invention, a part of an electric wire 150 that includes a first conductor 112 and a coating 116 is extended to form a second conductor 120. The coating 116 is stripped off by itself due to this extension step. Thereafter, the extended second conductor is cut in the middle thereby forming an electric wire for a winding member 100. This electric wire is formed into a predetermined shape such as U-shape to obtain the winding member 100. As a result, stripping off the coating can be omitted, thus improving working efficiency and enabling reduction in cost.Type: ApplicationFiled: November 3, 2003Publication date: November 11, 2004Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Atsushi Oohashi, Kensaku Kuroki