Patents by Inventor Atsuo Ishizuka
Atsuo Ishizuka 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: 11881341Abstract: Disclosed is a method of manufacturing a core sheet. The core sheet has an annular core back portion and a plurality of tooth portions extending from the core back portion toward a radial center thereof. The method includes a blanking step, a rolling step and a removing step. In the removing step, an insulation coating, which is on a region of a grain-oriented magnetic steel sheet for forming a band-shaped core back portion, on a band-shaped core back portion of a sheet piece or on the core back portion of the core sheet, is at least partially removed.Type: GrantFiled: March 31, 2020Date of Patent: January 23, 2024Assignees: DENSO CORPORATION, NIPPON STEEL CORPORATIONInventors: Tetsuya Aoki, Makoto Taniguchi, Atsuo Ishizuka, Satoshi Doi, Keiichi Okazaki, Hiroshi Fujimura, Tatsuya Takase
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Patent number: 11336161Abstract: A rotating electric machine includes a stator core, a stator coil formed of electrical conductors and insulating coats respectively covering the electrical conductors, and an encapsulating resin body. The stator coil has a coil end part protruding from the stator core. The coil end part includes exposed portions of the electrical conductors, which are exposed from the insulating coats, joints formed at the exposed portions, and covered portions of the electrical conductors which are covered with the respective insulating coats and respectively adjoin the exposed portions. The encapsulating resin body has a first part in which the exposed portions of the electrical conductors and the joints are encapsulated, and a second part in which at least part of each of the covered portions of the electrical conductors is encapsulated. A coefficient of linear expansion of the first part is lower than a coefficient of linear expansion of the second part.Type: GrantFiled: December 12, 2019Date of Patent: May 17, 2022Assignee: DENSO CORPORATIONInventors: Manabu Yamaji, Atsuo Ishizuka, Shinpei Fujiwara
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Patent number: 11271450Abstract: A rotary electric machine includes a cylindrical portion. In the cylindrical portion, a coolant passage having annular shape is formed to allow the coolant to flow therethrough. The coolant passage is formed meandering in the axial direction and the passage width of the coolant passage in a first end side in the radial direction is narrower than the passage width in the radial direction in the second end side. The coolant passage includes a circumferential passage in the first end side where the coolant flows in the circumferential direction. The circumferential passage is configured such that a passage opening area of an intermediate portion between an input portion in an upstream side of the coolant passage and an output portion in a downstream side of the coolant passage is expanded compared to those of the input portion and the output portion.Type: GrantFiled: January 8, 2020Date of Patent: March 8, 2022Assignee: DENSO CORPORATIONInventors: Shohei Yoshioka, Atsuo Ishizuka
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Patent number: 10992197Abstract: A stator for a rotating electric machine has a stator core provided with a plurality of slots arranged in a circumferential direction of the stator core, and a stator winding that is wound around the slots. The stator winding is configured of a plurality of covered conductor linear portions. The covered conductor linear portions are each provided with an exposed portion formed on an end. The plurality of covered conductor linear portions are each joined to another covered conductor linear portion at the exposed portion, and the conductor joined portion is covered by an insulator at least in a range that includes an end portion of the insulation cover. The insulation cover covers the conductor, in an adhered state there to, and has a low-adhesion portion that that is either adhesive-free or has a lower adhesive strength than other parts on the conductor and is distanced from an end portion.Type: GrantFiled: July 10, 2019Date of Patent: April 27, 2021Assignee: DENSO CORPORATIONInventors: Takefumi Kaji, Atsuo Ishizuka
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Publication number: 20200234870Abstract: Disclosed are a core sheet and a manufacturing method thereof. The core sheet has an annular core back portion and a plurality of tooth portions extending from the core back portion toward a radial center thereof. The core sheet is obtained by performing a blanking step, a rolling step and a removing step. In the removing step, an insulation coating, which is on a region of a grain-oriented magnetic steel sheet for forming a band-shaped core back portion, on a band-shaped core back portion of a sheet piece or on the core back portion of the core sheet, is at least partially removed.Type: ApplicationFiled: March 31, 2020Publication date: July 23, 2020Inventors: Tetsuya AOKI, Makoto TANIGUCHI, Atsuo ISHIZUKA, Satoshi DOI, Keiichi OKAZAKI, Hiroshi FUJIMURA, Tatsuya TAKASE
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Publication number: 20200220421Abstract: A rotary electric machine includes a cylindrical portion. In the cylindrical portion, a coolant passage having annular shape is formed to allow the coolant to flow therethrough. The coolant passage is formed meandering in the axial direction and the passage width of the coolant passage in a first end side in the radial direction is narrower than the passage width in the radial direction in the second end side. The coolant passage includes a circumferential passage in the first end side where the coolant flows in the circumferential direction. The circumferential passage is configured such that a passage opening area of an intermediate portion between an input portion in an upstream side of the coolant passage and an output portion in a downstream side of the coolant passage is expanded compared to those of the input portion and the output portion.Type: ApplicationFiled: January 8, 2020Publication date: July 9, 2020Applicant: DENSO CORPORATIONInventors: Shohei YOSHIOKA, Atsuo ISHIZUKA
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Publication number: 20200195108Abstract: A rotating electric machine includes a stator core, a stator coil formed of electrical conductors and insulating coats respectively covering the electrical conductors, and an encapsulating resin body. The stator coil has a coil end part protruding from the stator core. The coil end part includes exposed portions of the electrical conductors, which are exposed from the insulating coats, joints formed at the exposed portions, and covered portions of the electrical conductors which are covered with the respective insulating coats and respectively adjoin the exposed portions. The encapsulating resin body has a first part in which the exposed portions of the electrical conductors and the joints are encapsulated, and a second part in which at least part of each of the covered portions of the electrical conductors is encapsulated. A coefficient of linear expansion of the first part is lower than a coefficient of linear expansion of the second part.Type: ApplicationFiled: December 12, 2019Publication date: June 18, 2020Applicant: DENSO CORPORATIONInventors: Manabu YAMAJI, Atsuo ISHIZUKA, Shinpei FUJIWARA
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Patent number: 10554087Abstract: A rotating electric machine includes a pair of electric conductors for forming a coil and a weld. Each of the electric conductors has an end portion with an end surface. The weld is formed between the end portions of the electric conductors at the end surfaces of the end portions. Moreover, the end portions of the electric conductors are arranged so that parts of the end portions of the electric conductors adjoin each other. At least one of the end portions of the electric conductors has at least one slit formed therein to divide the end surface of the end portion into a plurality of sections. The weld is formed to cover, at least, the adjoining parts of the end portions of the electric conductors and the at least one slit.Type: GrantFiled: March 2, 2017Date of Patent: February 4, 2020Assignee: DENSO CORPORATIONInventors: Atsuo Ishizuka, Hiromitsu Asai, Mitsuyuki Hayashi, Yoki Tsujimori
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Patent number: 10530201Abstract: A stator includes a stator core having slots arranged in a circumferential direction and a stator coil formed by wave-winding continuous coil wires on the stator core. Each of the continuous coil wires has in-slot portions received in the slots and turn portions each of which connects, on the outside of the slots, one pair of the in-slot portions. The stator coil is formed, by spirally rolling a band-shaped coil wire bundle that is formed by bundling the continuous coil wires, into a cylindrical shape. In the coil wire bundle, the continuous coil wires are transposed at a plurality of locations. Moreover, in a range where the continuous coil wires extend in the circumferential direction of the stator core by one complete turn, at least one interval between adjacent transposition locations in the coil wire bundle is greater than or equal to the circumferential length of one turn portion.Type: GrantFiled: November 6, 2015Date of Patent: January 7, 2020Assignee: DENSO CORPORATIONInventors: Akito Akimoto, Masayuki Takiguchi, Atsuo Ishizuka
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Publication number: 20190334397Abstract: A stator for a rotating electric machine has a stator core provided with a plurality of slots arranged in a circumferential direction of the stator core, and a stator winding that is wound around the slots. The stator winding is configured of a plurality of covered conductor linear portions. The covered conductor linear portions are each provided with an exposed portion formed on an end. The plurality of covered conductor linear portions are each joined to another covered conductor linear portion at the exposed portion, and the conductor joined portion is covered by an insulator at least in a range that includes an end portion of the insulation cover. The insulation cover covers the conductor, in an adhered state there to, and has a low-adhesion portion that that is either adhesive-free or has a lower adhesive strength than other parts on the conductor and is distanced from an end portion.Type: ApplicationFiled: July 10, 2019Publication date: October 31, 2019Applicant: DENSO CORPORATIONInventors: Takefumi KAJI, Atsuo ISHIZUKA
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Patent number: 10404120Abstract: A stator includes a stator core having a plurality of slots arranged in a circumferential direction and a stator coil formed by wave-winding continuous coil wires on the stator core. Each of the continuous coil wires has in-slot portions received in the slots and turn portions each of which connects, on the outside of the slots, one pair of the in-slot portions. Each of the continuous coil wires has, at root parts of the turn portions respectively connected with ends of the in-slot portions, first crank portions that are radially bent. An amount of radial bending of the first crank portions is set to be half of a radial width of the in-slot portions.Type: GrantFiled: November 6, 2015Date of Patent: September 3, 2019Assignee: DENSO CORPORATIONInventors: Atsuo Ishizuka, Akito Akimoto, Masayuki Takiguchi
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Publication number: 20190123603Abstract: A rotor of a rotating electrical machine includes a field core having a boss portion, multiple disc portions, and multiple claw-shaped magnetic pole portions; a field winding wound around an outer peripheral side of the boss portion to generate magnetomotive force by power application; and a tubular member arranged so as to cover the outer periphery of the claw-shaped magnetic pole portions. The tubular member includes multiple steel plates stacked in an axial direction, and is configured such that an inner diameter in a steady state is smaller than the outer diameter of the claw-shaped magnetic pole portions.Type: ApplicationFiled: June 1, 2017Publication date: April 25, 2019Applicant: DENSO CORPORATIONInventors: Yuki TAKAHASHI, Atsuo ISHIZUKA
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Publication number: 20180287445Abstract: A stator includes a stator core having a plurality of slots arranged in a circumferential direction and a stator coil formed by wave-winding continuous coil wires on the stator core. Each of the continuous coil wires has in-slot portions received in the slots and turn portions each of which connects, on the outside of the slots, one pair of the in-slot portions. Each of the continuous coil wires has, at root parts of the turn portions respectively connected with ends of the in-slot portions, first crank portions that are radially bent. An amount of radial bending of the first crank portions is set to be half of a radial width of the in-slot portions.Type: ApplicationFiled: November 6, 2015Publication date: October 4, 2018Applicant: DENSO CORPORATIONInventors: Atsuo ISHIZUKA, Akito AKIMOTO, Masayuki TAKIGUCHI
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Patent number: 10075039Abstract: A rotating electric machine includes a weld formed by welding end portions of a pair of electric conductors for forming a coil and a weld-insulating member that covers, at least, a surface of the weld. The weld has an uneven portion formed on at least part of the surface thereof. The uneven portion is constituted of a plurality of annular recesses and a plurality of annular protrusions. The annular recesses are formed alternately and continuously with the annular protrusions.Type: GrantFiled: July 26, 2016Date of Patent: September 11, 2018Assignee: DENSO CORPORATIONInventors: Atsuo Ishizuka, Hiroshi Kaneiwa, Keiji Kondou, Hiromitsu Asai
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Patent number: 9831735Abstract: A stator includes a hollow cylindrical stator core and a stator coil formed of a plurality of electric conductor segments. Each of the electric conductor segments includes, at least, an in-slot portion received in a corresponding slot of the stator core and a protruding portion that protrudes from the in-slot portion outside of the corresponding slot. Each of the electric conductor segments also has an insulating coat covering its outer surface. For each intersecting pair of the protruding portions of the electric conductor segments, at least one of the two protruding portions of the intersecting pair has an indentation formed in a side face thereof radially facing the other protruding portion at the intersection of the two protruding portions. Further, a thickness of the insulating coats at the indentations is substantially equal to a thickness of the insulating coats at the in-slot portions of the electric conductor segments.Type: GrantFiled: July 24, 2013Date of Patent: November 28, 2017Assignee: DENSO CORPORATIONInventors: Atsuo Ishizuka, Tetsuya Gorohata
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Publication number: 20170324286Abstract: A stator includes a stator core having slots arranged in a circumferential direction and a stator coil formed by wave-winding continuous coil wires on the stator core. Each of the continuous coil wires has in-slot portions received in the slots and turn portions each of which connects, on the outside of the slots, one pair of the in-slot portions. The stator coil is formed, by spirally rolling a band-shaped coil wire bundle that is formed by bundling the continuous coil wires, into a cylindrical shape. In the coil wire bundle, the continuous coil wires are transposed at a plurality of locations. Moreover, in a range where the continuous coil wires extend in the circumferential direction of the stator core by one complete turn, at least one interval between adjacent transposition locations in the coil wire bundle is greater than or equal to the circumferential length of one turn portion.Type: ApplicationFiled: November 6, 2015Publication date: November 9, 2017Applicant: DENSO CORPORATIONInventors: Akito AKIMOTO, Masayuki TAKIGUCHI, Atsuo ISHIZUKA
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Publication number: 20170257002Abstract: A rotating electric machine includes a pair of electric conductors for forming a coil and a weld. Each of the electric conductors has an end portion with an end surface. The weld is formed between the end portions of the electric conductors at the end surfaces of the end portions. Moreover, the end portions of the electric conductors are arranged so that parts of the end portions of the electric conductors adjoin each other. At least one of the end portions of the electric conductors has at least one slit formed therein to divide the end surface of the end portion into a plurality of sections. The weld is formed to cover, at least, the adjoining parts of the end portions of the electric conductors and the at least one slit.Type: ApplicationFiled: March 2, 2017Publication date: September 7, 2017Applicant: DENSO CORPORATIONInventors: Atsuo ISHIZUKA, Hiromitsu ASAI, Mitsuyuki HAYASHI, Yoki TSUJIMORI
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Publication number: 20170033636Abstract: A rotating electric machine includes a weld formed by welding end portions of a pair of electric conductors for forming a coil and a weld-insulating member that covers, at least, a surface of the weld. The weld has an uneven portion formed on at least part of the surface thereof. The uneven portion is constituted of a plurality of annular recesses and a plurality of annular protrusions. The annular recesses are formed alternately and continuously with the annular protrusions.Type: ApplicationFiled: July 26, 2016Publication date: February 2, 2017Applicant: DENSO CORPORATIONInventors: Atsuo ISHIZUKA, Hiroshi KANEIWA, Keiji KONDOU, Hiromitsu ASAI
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Patent number: 9559556Abstract: A stator includes an annular stator core having a plurality of slots arranged in the circumferential direction at predetermined intervals and a stator coil formed of a plurality of electric conductor wires mounted on the stator core. Each of the electric conductor wires has a plurality of in-slot portions received in the slots of the stator core and a plurality of turn portions that connect, on the outside of the slots, adjacent pairs of the in-slot portions. The stator coil has first and second coil end parts and that respectively protrude axially outward from a pair of axial end faces of the stator core. At each of the coil end parts, the turn portions of the electric conductor wires are stacked in a radial direction of the stator core, and the axial heights h1 of the turn portions are set so as to gradually increase from the radially inside to the radially outside.Type: GrantFiled: April 5, 2012Date of Patent: January 31, 2017Assignee: DENSO CORPORATIONInventors: Akio Mori, Akito Akimoto, Atsuo Ishizuka
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Patent number: 9419499Abstract: A rotating electric machine includes a rotor, a stator, a cooling device and a pair of cooling liquid collection tanks. The stator includes an annular stator core and a stator coil. The stator core is disposed radially outside the rotor so as to surround the rotor. The stator coil is mounted on the stator core so that a pair of coil ends of the stator coil protrude axially outward respectively from opposite axial end faces of the stator core. The cooling device is configured to supply cooling liquid to vertically upper parts of the coil ends of the stator coil. Each of the cooling liquid collection tanks is arranged to surround a vertically lower part of a corresponding one of the coil ends so as to collect and temporarily reserve therein the cooling liquid moved from the upper part to the lower part of the corresponding coil end.Type: GrantFiled: May 22, 2014Date of Patent: August 16, 2016Assignee: DENSO CORPORATIONInventors: Hirohito Matsui, Koji Asagara, Atsuo Ishizuka