Patents by Inventor Kazuhito Hiraga
Kazuhito Hiraga 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: 11843284Abstract: Provided are a rotor of a rotary electric machine, and a rotary electric machine, in which torque ripple can be efficiently reduced with a simple configuration. In the rotor of the rotary electric machine which is rotatably disposed in a stator, and the rotary electric machine including the stator, and the rotor rotatably disposed in the stator, two or more magnets are arranged per pole, and arranged such that separation distances, between the two or more magnets per pole along a circumferential direction of the rotor, alternately vary every pole along the circumferential direction of the rotor.Type: GrantFiled: February 22, 2022Date of Patent: December 12, 2023Assignee: HONDA MOTOR CO., LTD.Inventor: Kazuhito Hiraga
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Publication number: 20220311293Abstract: Provided are a rotor of a rotary electric machine, and a rotary electric machine, in which torque ripple can be efficiently reduced with a simple configuration. In the rotor of the rotary electric machine which is rotatably disposed in a stator, and the rotary electric machine including the stator, and the rotor rotatably disposed in the stator, two or more magnets are arranged per pole, and arranged such that separation distances, between the two or more magnets per pole along a circumferential direction of the rotor, alternately vary every pole along the circumferential direction of the rotor.Type: ApplicationFiled: February 22, 2022Publication date: September 29, 2022Inventor: Kazuhito HIRAGA
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Patent number: 11342823Abstract: Provided are a clamp jig for inhibiting an increase in the size of clamping equipment, and reducing the load during clamping by clamping after doing preliminary aligning of a segment end part; a stator manufacturing device; and a method for manufacturing a stator. The clamp jig 40 has a pair of clamp bodies 41, extended in a stator core radial direction, for clamping from both sides in the stator core circumferential direction the end part of an electric conductor, which is inserted in the stator core and welded; and a convex part 42 provided extending in the stator core axis direction at the bottom of the clamp body 41, the convex part being inserted between unwelded electric conductors.Type: GrantFiled: March 17, 2017Date of Patent: May 24, 2022Assignee: HONDA MOTOR CO., LTD.Inventors: Takeshi Yanagisawa, Kazuhito Hiraga, Hideaki Onda, Kenichiro Murata, Akifumi Sudo
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Patent number: 10992209Abstract: A locator-equipped clamp jig capable of suppressing interference between base sections of segments when clamped by the clamp jig, a stator manufacturing device, and a method for manufacturing a stator. The locator-equipped clamp jig has a locator that is provided to part of a main clamp body on a stator core side and has a plurality of protrusions arranged on an upper surface of an electrical conductor that is adjacent, in the radial direction of the stator core, to an electrical conductor being clamped by the main clamp body, the width of the protrusions in the radial direction of the stator core being at least the width of one of the electrical conductors.Type: GrantFiled: March 17, 2017Date of Patent: April 27, 2021Assignee: HONDA MOTOR CO., LTD.Inventors: Kenichiro Murata, Kazuhito Hiraga, Takeshi Yanagisawa, Akifumi Sudo
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Patent number: 10644413Abstract: A method for joining segments (electrical conductors) includes first and second joining steps. The first joining step includes welding a group of the segments including ends, such that the first group is welded to pairs of electrical conductors. The second joining step includes welding a second group of the segments including ends, which are composed of the segments whose ends are arranged in a column in the radial direction, such that the second group is welded to pairs of electrical conductors. The first group includes a segment as a first electrical conductor including the end which is located at the middle portion of a group of the segments including the ends in the radial direction. The second group includes a segment as a second electrical conductor including the end which crosses the first electrical conductor on the opposite sides with respect to the middle portion in the radial direction.Type: GrantFiled: December 11, 2017Date of Patent: May 5, 2020Assignee: HONDA MOTOR CO., LTD.Inventors: Takeshi Yanagisawa, Kenichiro Murata, Akifumi Sudo, Kazuhito Hiraga, Junya Tachikawa
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Publication number: 20190305621Abstract: The wound coil (7) includes first to fourth inner bases (11a) to (11d), first to fourth outer bases (12a) to (12d). The wound coil (7) includes first to fourth upper connection portions (16a) to (16d), first to third lower connection portions (17a) to (17c), and first to fourth winding portions (18a) to (18d). In the first to fourth winding portions (18a) to (18d), the third and fourth upper connection portions (16c) and (16d) are stacked on the first and second upper connection portions (16a) and (16b) in the circumferential direction D1 and the first and third lower connection portions (17a) and (17c) are continuously stacked on the second lower connection portion (17b) in the circumferential direction D1.Type: ApplicationFiled: March 25, 2019Publication date: October 3, 2019Inventors: Keiichiro Oka, Kazuhito Hiraga, Kenichi Omagari
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Publication number: 20190081539Abstract: Provided are a clamp jig for inhibiting an increase in the size of clamping equipment, and reducing the load during clamping by clamping after doing preliminary aligning of a segment end part; a stator manufacturing device; and a method for manufacturing a stator. The clamp jig 40 has a pair of clamp bodies 41, extended in a stator core radial direction, for clamping from both sides in the stator core circumferential direction the end part of an electric conductor, which is inserted in the stator core and welded; and a convex part 42 provided extending in the stator core axis direction at the bottom of the clamp body 41, the convex part being inserted between unwelded electric conductors.Type: ApplicationFiled: March 17, 2017Publication date: March 14, 2019Applicant: HONDA MOTOR CO., LTD.Inventors: Takeshi Yanagisawa, Kazuhito Hiraga, Hideaki Onda, Kenichiro Murata, Akifumi Sudo
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Publication number: 20190036428Abstract: A locator-equipped clamp jig capable of suppressing interference between base sections of segments when clamped by the clamp jig, a stator manufacturing device, and a method for manufacturing a stator. The locator-equipped clamp jig has a locator that is provided to part of a main clamp body on a stator core side and has a plurality of protrusions arranged on an upper surface of an electrical conductor that is adjacent, in the radial direction of the stator core, to an electrical conductor being clamped by the main clamp body, the width of the protrusions in the radial direction of the stator core being at least the width of one of the electrical conductors.Type: ApplicationFiled: March 17, 2017Publication date: January 31, 2019Inventors: Kenichiro Murata, Kazuhito Hiraga, Takeshi Yanagisawa, Akifumi Sudo
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Publication number: 20180166796Abstract: A method for joining segments (electrical conductors) includes first and second joining steps. The first joining step includes welding a group of the segments including ends, such that the first group is welded to pairs of electrical conductors. The second joining step includes welding a second group of the segments including ends, which are composed of the segments whose ends are arranged in a column in the radial direction, such that the second group is welded to pairs of electrical conductors. The first group includes a segment as a first electrical conductor including the end which is located at the middle portion of a group of the segments including the ends in the radial direction. The second group includes a segment as a second electrical conductor including the end which crosses the first electrical conductor on the opposite sides with respect to the middle portion in the radial direction.Type: ApplicationFiled: December 11, 2017Publication date: June 14, 2018Inventors: Takeshi Yanagisawa, Kenichiro Murata, Akifumi Sudo, Kazuhito Hiraga, Junya Tachikawa
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Patent number: 9077233Abstract: An insertion system for electrical conductors is provided that can widen the gap between insulating paper. An insertion system (1) includes: a first moving part (4) that causes a leg of the coil element (10) to move in an insertion direction of a slot (16); a guide part (3) that guides the leg into the slot (16); and a pair of first spreader plates (7A) and a pair of second spreader plates (7B) that can spread at a leading end side thereof, in which these pairs of spreader plates are formed so as to extend inclined relative to the insertion direction so as to approach each other towards a leading end side, and a gap therebetween is narrower than a width of insulating paper (17) at the leading end side, and is wider than a width of the leg of the coil element (10) at a base end side.Type: GrantFiled: July 10, 2013Date of Patent: July 7, 2015Assignee: HONDA MOTOR CO., LTD.Inventors: Toru Yoshida, Mitsuhiro Yamada, Yutaka Matsumoto, Kenichi Ohno, Kazuhito Hiraga, Junji Nakajima
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Publication number: 20140013592Abstract: An insertion system for electrical conductors is provided that can widen the gap between insulating paper. An insertion system (1) includes: a first moving part (4) that causes a leg of the coil element (10) to move in an insertion direction of a slot (16); a guide part (3) that guides the leg into the slot (16); and a pair of first spreader plates (7A) and a pair of second spreader plates (7B) that can spread at a leading end side thereof, in which these pairs of spreader plates are formed so as to extend inclined relative to the insertion direction so as to approach each other towards a leading end side, and a gap therebetween is narrower than a width of insulating paper (17) at the leading end side, and is wider than a width of the leg of the coil element (10) at a base end side.Type: ApplicationFiled: July 10, 2013Publication date: January 16, 2014Inventors: Toru Yoshida, Mitsuhiro Yamada, Yutaka Matsumoto, Kenichi Ohno, Kazuhito Hiraga, Junji Nakajima
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Patent number: 8552611Abstract: The present invention provides a coil end structure of a rotating electric machine which is able to miniaturize the coil end structure without having an insulation coating of a flat wire being affected. A coil segment 4 is composed of a plurality of flat wires. A surface of each flat wire confronting another in a slot 2a (legs 41 and 41) is identical to the surface confronting the other at a coil end (head 42).Type: GrantFiled: November 14, 2011Date of Patent: October 8, 2013Assignee: Honda Motor Co., Ltd.Inventors: Yoshihisa Matsuoka, Kazuhito Hiraga
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Publication number: 20120200190Abstract: The present invention provides a coil end structure of a rotating electric machine which is able to miniaturize the coil end structure without having an insulation coating of a flat wire being affected. A coil segment 4 is composed of a plurality of flat wires. A surface of each flat wire confronting another in a slot 2a (legs 41 and 41) is identical to the surface confronting the other at a coil end (head 42).Type: ApplicationFiled: November 14, 2011Publication date: August 9, 2012Applicant: HONDA MOTOR CO., LTD.Inventors: Yoshihisa Matsuoka, Kazuhito Hiraga
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Publication number: 20110260572Abstract: A motor stator (10) is provided with a stator core (11) having a plurality of slots (16), insulation members (12) which are disposed in the plurality of slots, and coils of a plurality of phases (13) which are respectively formed by distributed-winding wires (20) in prescribed slots of the plurality of slots disposed spaced apart at intervals of a predetermined number of slots via the insulation members. The wires are disposed within the insulation members in a condition that tensions are applied to the wires. The stator core, the insulation members and the coils are physically fixed together by the tensions of the wires.Type: ApplicationFiled: April 19, 2011Publication date: October 27, 2011Applicant: HONDA MOTOR CO., LTD.Inventors: Kazuhito Hiraga, Kenichi Omagari, Takumi Shibata, Masahito Kakema, Yoshihisa Matsuoka, Mitsuhiro Okamura, Eiji Ninomiya, Takeshi Yanagisawa
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Publication number: 20100323206Abstract: A film composed of a metal or a semimetal is formed on a surface of a soft magnetic powder including iron and oxygen (in step S102). In this case, a silicon-containing film is desirably formed on a surface of the film. Next, compaction is performed on the soft magnetic powder, so that a green compact is obtained (in step S103). Since the film is a metal film or a semimetal film having a high ductility, the density of the green compact produced by the compaction can be higher, and generation of damage, such as cracks or the like, can be prevented in the film. The effects can be also obtained in a case of formation of the silicon-containing film. Next, the green compact is subjected to heating, so that a surface and an interface of the soft magnetic powder of the green compact are oxidized, so that an insulation film is formed (in step S104). Generation of eddy current loss can be prevented by the oxide film. As a result, productivity and magnetic properties can be improved.Type: ApplicationFiled: January 8, 2009Publication date: December 23, 2010Inventors: Shingo Soma, Kazuhito Hiraga, Yoshiki Hirano
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Patent number: 6071464Abstract: A process for modifying the surface of a base metal formed from a hard material instead of forming a coating film thereon comprises compacting a powder of a hard material, baking the compacted product, dipping the baked product in an alkoxide containing titanium, and sintering the alkoxide-covered baked product in a nitrogen gas atmosphere. The sintered product has very hard titanium carbide, nitride or carbide-nitride particles deposited on the base metal surface. The particles are partly embedded in the base metal and partly protrude from its surface, and are, therefore, very unlikely to come off, while they withstand a temperature change very well.Type: GrantFiled: February 10, 1998Date of Patent: June 6, 2000Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Mitsuhiro Funaki, Mitsuo Kuwabara, Kazuhito Hiraga, Tetsuya Ohishi
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Patent number: 5945167Abstract: A grain growth accelerator in a form dispersed in an aqueous solution or an organic solvent is introduced into a preliminarily fired body, and thereafter the preliminarily fired body is fired in a main firing process. In the main firing process, a volumetric diffusion of metal and grain growth of ceramic particles are caused as the firing temperature increases. Therefore, it is possible to manufacture a composite material which has such a gradient function that it is ceramic-rich on its surface and metal-rich in its inside, a high degree of surface hardness and toughness, and an interface-free structure.Type: GrantFiled: July 15, 1997Date of Patent: August 31, 1999Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Mitsuo Kuwabara, Mitsuhiro Funaki, Kazuhito Hiraga, Tetsuya Ohishi
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Patent number: 5704994Abstract: A shaped object with a roughened surface is immersed in an aqueous solution of a metal salt and/or a solution of an organic metal. After the shaped object is dried, it is heated to form a metal-diffused layer in the shaped object and a ceramic surface layer on the shaped object. The ceramic surface layer has a large hardness, and is prevented from peeling off.Type: GrantFiled: October 27, 1995Date of Patent: January 6, 1998Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Mitsuo Kuwabara, Mitsuhiro Funaki, Kazuhito Hiraga, Tetsuya Ohishi