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).

  • Patent number: 11336161
    Abstract: 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: Grant
    Filed: December 12, 2019
    Date of Patent: May 17, 2022
    Assignee: DENSO CORPORATION
    Inventors: Manabu Yamaji, Atsuo Ishizuka, Shinpei Fujiwara
  • Patent number: 11271450
    Abstract: 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: Grant
    Filed: January 8, 2020
    Date of Patent: March 8, 2022
    Assignee: DENSO CORPORATION
    Inventors: Shohei Yoshioka, Atsuo Ishizuka
  • Patent number: 10992197
    Abstract: 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: Grant
    Filed: July 10, 2019
    Date of Patent: April 27, 2021
    Assignee: DENSO CORPORATION
    Inventors: Takefumi Kaji, Atsuo Ishizuka
  • Publication number: 20200234870
    Abstract: 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: Application
    Filed: March 31, 2020
    Publication date: July 23, 2020
    Inventors: Tetsuya AOKI, Makoto TANIGUCHI, Atsuo ISHIZUKA, Satoshi DOI, Keiichi OKAZAKI, Hiroshi FUJIMURA, Tatsuya TAKASE
  • Publication number: 20200220421
    Abstract: 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: Application
    Filed: January 8, 2020
    Publication date: July 9, 2020
    Applicant: DENSO CORPORATION
    Inventors: Shohei YOSHIOKA, Atsuo ISHIZUKA
  • Publication number: 20200195108
    Abstract: 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: Application
    Filed: December 12, 2019
    Publication date: June 18, 2020
    Applicant: DENSO CORPORATION
    Inventors: Manabu YAMAJI, Atsuo ISHIZUKA, Shinpei FUJIWARA
  • Patent number: 10554087
    Abstract: 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: Grant
    Filed: March 2, 2017
    Date of Patent: February 4, 2020
    Assignee: DENSO CORPORATION
    Inventors: Atsuo Ishizuka, Hiromitsu Asai, Mitsuyuki Hayashi, Yoki Tsujimori
  • Patent number: 10530201
    Abstract: 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: Grant
    Filed: November 6, 2015
    Date of Patent: January 7, 2020
    Assignee: DENSO CORPORATION
    Inventors: Akito Akimoto, Masayuki Takiguchi, Atsuo Ishizuka
  • Publication number: 20190334397
    Abstract: 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: Application
    Filed: July 10, 2019
    Publication date: October 31, 2019
    Applicant: DENSO CORPORATION
    Inventors: Takefumi KAJI, Atsuo ISHIZUKA
  • Patent number: 10404120
    Abstract: 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: Grant
    Filed: November 6, 2015
    Date of Patent: September 3, 2019
    Assignee: DENSO CORPORATION
    Inventors: Atsuo Ishizuka, Akito Akimoto, Masayuki Takiguchi
  • Publication number: 20190123603
    Abstract: 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: Application
    Filed: June 1, 2017
    Publication date: April 25, 2019
    Applicant: DENSO CORPORATION
    Inventors: Yuki TAKAHASHI, Atsuo ISHIZUKA
  • Publication number: 20180287445
    Abstract: 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: Application
    Filed: November 6, 2015
    Publication date: October 4, 2018
    Applicant: DENSO CORPORATION
    Inventors: Atsuo ISHIZUKA, Akito AKIMOTO, Masayuki TAKIGUCHI
  • Patent number: 10075039
    Abstract: 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: Grant
    Filed: July 26, 2016
    Date of Patent: September 11, 2018
    Assignee: DENSO CORPORATION
    Inventors: Atsuo Ishizuka, Hiroshi Kaneiwa, Keiji Kondou, Hiromitsu Asai
  • Patent number: 9831735
    Abstract: 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: Grant
    Filed: July 24, 2013
    Date of Patent: November 28, 2017
    Assignee: DENSO CORPORATION
    Inventors: Atsuo Ishizuka, Tetsuya Gorohata
  • Publication number: 20170324286
    Abstract: 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: Application
    Filed: November 6, 2015
    Publication date: November 9, 2017
    Applicant: DENSO CORPORATION
    Inventors: Akito AKIMOTO, Masayuki TAKIGUCHI, Atsuo ISHIZUKA
  • Publication number: 20170257002
    Abstract: 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: Application
    Filed: March 2, 2017
    Publication date: September 7, 2017
    Applicant: DENSO CORPORATION
    Inventors: Atsuo ISHIZUKA, Hiromitsu ASAI, Mitsuyuki HAYASHI, Yoki TSUJIMORI
  • Publication number: 20170033636
    Abstract: 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: Application
    Filed: July 26, 2016
    Publication date: February 2, 2017
    Applicant: DENSO CORPORATION
    Inventors: Atsuo ISHIZUKA, Hiroshi KANEIWA, Keiji KONDOU, Hiromitsu ASAI
  • Patent number: 9559556
    Abstract: 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: Grant
    Filed: April 5, 2012
    Date of Patent: January 31, 2017
    Assignee: DENSO CORPORATION
    Inventors: Akio Mori, Akito Akimoto, Atsuo Ishizuka
  • Patent number: 9419499
    Abstract: 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: Grant
    Filed: May 22, 2014
    Date of Patent: August 16, 2016
    Assignee: DENSO CORPORATION
    Inventors: Hirohito Matsui, Koji Asagara, Atsuo Ishizuka
  • Patent number: 9124156
    Abstract: The rotor for an electric rotating machine includes a rotor core fixed to a rotating shaft and formed with at least one magnet accommodating hole, a magnet accommodated in the magnet accommodating hole, a resin portion filled in the magnet accommodating hole accommodating the magnet, a first end plate fixed to the rotating shaft at one axial side of the rotor core, and a second end plate fixed to the rotating shaft at the other axial side of the rotor core. The axial fixing force of the second end plate against the rotating shaft is smaller than that of the first end plate. At least a part of the resin portion is present in an axial area between the magnet accommodated in the magnet accommodating hole and the first end plate, and the magnet is in direct contact with the second end plate.
    Type: Grant
    Filed: June 4, 2013
    Date of Patent: September 1, 2015
    Assignee: DENSO CORPORATION
    Inventors: Hiroyuki Ikuta, Atsuo Ishizuka, Junichi Nakazono