Patents by Inventor Koichi Ojima

Koichi Ojima 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: 10811939
    Abstract: In order to efficiently cool a stator and rotor of a rotating electrical machine, cooling oil is supplied by a pump in a pressurized state to a first reservoir portion provided in an upper portion inside a housing, and after the cooling oil is ejected from the first reservoir portion, the cooling oil is guided to a stator coil end cooling structure, and to a rotor bearing and rotor core cooling structure, using the weight of the cooling oil itself.
    Type: Grant
    Filed: October 28, 2014
    Date of Patent: October 20, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshiaki Kitta, Koichi Ojima, Katsunari Takagi, Masaya Inoue, Hiroyuki Higashino
  • Patent number: 10749402
    Abstract: The rotary electric machine includes: a stator that includes: a stator core; and a stator coil; a ring member that accommodates the stator so as to hold the stator core in an internally fitted state; a housing case formed into a floored cylindrical shape with an opening at a first end portion, and that accommodates the ring member and the stator; and a cover mounted onto the first end portion of the housing case so as to cover the opening of the housing case, wherein a first end portion of each of the ring member and the housing case is fixed by fastening to the cover such that a fastening direction of each is oriented in an axial direction, and a second end portion of the ring member is fitted into and held by the housing case by means of an interfitting member.
    Type: Grant
    Filed: May 2, 2012
    Date of Patent: August 18, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Naoki Ohashi, Masaya Inoue, Koichi Ojima, Kazuyuki Iwamoto
  • Publication number: 20200212752
    Abstract: A rotating electrical machine includes a rotor; a stator having a core annularly arranged facing the outer peripheral surface of the rotor, a coil wound around the core and having a coil end formed protruding from an end surface in the axial direction of the core, and an insulator formed on the end surface in the axial direction of the core and insulating the core and the coil; a bus bar arranged on the outer peripheral side of the coil end of the stator; and a terminal block installed on the outer peripheral side of the bus bar for introducing an electric current from an external power source to the stator, and the insulator has a groove portion in which the bus bar is held, and a terminal block housing portion in which the terminal block is held.
    Type: Application
    Filed: November 11, 2016
    Publication date: July 2, 2020
    Inventors: Yoshiaki KITTA, Ken NISHIKAWA, Yoshiki KUWAHARA, Fumitaka TOTSUKA, Yutaka IKURA, Koichi OJIMA, Masaya INOUE
  • Patent number: 10554092
    Abstract: In the rotary electric machine according to the present invention, a first O-ring 13a is mounted between a pair of position regulating members 12 that are press-fitted onto and held in a vicinity of a second axial end of an outer circumferential surface of a stator core housing portion 10a so as to be spaced apart in an axial direction, and is pressed and held between the stator core housing portion 10a and a cylindrical portion 16, and a second O-ring 13b is mounted into an O-ring housing groove 11 that is recessed into an outer circumferential surface of a frame mounting portion 10b, and is pressed and held between the frame mounting portion 10b and the cylindrical portion 16, such that a coolant channel 22 is formed between the frame 10 and the cylindrical portion 16.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: February 4, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Koichi Ojima, Naoki Ohashi
  • Patent number: 10498199
    Abstract: A rotary electric machine of the present invention includes, inside a housing, a rotor and a stator that are concentric with each other. The stator has a plurality of coil portions in a circumferential direction. In the stator, a first flow channel and a second flow channel, through which cooling water flows, are provided along the plurality of coil portions, each of the channels having one end connected to a flow channel inlet and the other end connected to a flow channel outlet. The lengths of the first flow channel and the second flow channel are mutually different. A temperature detection element is provided in a coil portion on a high temperature side among the coil portions positioned along the first flow channel and the coil portions positioned along the second flow channel.
    Type: Grant
    Filed: November 9, 2017
    Date of Patent: December 3, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Ken Nishikawa, Norihiro Watanabe, Koichi Ojima
  • Publication number: 20190260255
    Abstract: A rotating electric machine includes a rotor, a stator, and a case, wherein each of the sub stator cores has a first insulated bobbin, a stator iron core, a second insulated bobbin, and a coil, and the coil is disposed in teeth parts of the first insulated bobbin, the stator iron core, and the second insulated bobbin, all of which are stacked in layers, and the first insulated bobbin has three ring holding parts which are formed in a core back part and extend to a circumferential direction, and the bus rings are separately inserted into the ring holding parts formed in the first insulated bobbin, and the first insulated bobbin, the stator iron core, and the second insulated bobbin each has a convex part formed at one side face of the core back part and a concave part formed at the other side face of the core back part.
    Type: Application
    Filed: November 16, 2016
    Publication date: August 22, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yoshiki KUWAHARA, Ryuji KITAMURA, Yoshiaki KITTA, Fumitaka TOTSUKA, Koichi OJIMA, Masaya INOUE
  • Patent number: 10291104
    Abstract: An electric rotating machine that can raise the utilization efficiency of cooling oil is obtained. In an rotation axle, there are provided an oil flow path having a predetermined length from an end of the rotation axle and a flow path hole that communicates with the oil flow path and has an opening toward the inside of the electric rotating machine; a supporting member includes a cylinder section and a disk section that partitions the cylinder section in the axis direction, and a discharging hole is provided at an end of the cylinder section; between the flow path hole and the discharging hole, there is provided a partition plate that encloses a space formed by the supporting member and the rotation axle and guides cooling oil traveling from the flow path hole to the inside of the electric rotating machine to the discharging hole.
    Type: Grant
    Filed: May 21, 2015
    Date of Patent: May 14, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tadashi Murakami, Yukitaka Sakata, Yoshiaki Kitta, Katsunari Takagi, Koichi Ojima, Masaya Inoue
  • Publication number: 20180309348
    Abstract: A rotary electric machine of the present invention includes, inside a housing, a rotor and a stator that are concentric with each other. The stator has a plurality of coil portions in a circumferential direction. In the stator, a first flow channel and a second flow channel, through which cooling water flows, are provided along the plurality of coil portions, each of the channels having one end connected to a flow channel inlet and the other end connected to a flow channel outlet. The lengths of the first flow channel and the second flow channel are mutually different. A temperature detection element is provided in a coil portion on a high temperature side among the coil portions positioned along the first flow channel and the coil portions positioned along the second flow channel.
    Type: Application
    Filed: November 9, 2017
    Publication date: October 25, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Ken NISHIKAWA, Norihiro WATANABE, Koichi OJIMA
  • Patent number: 10103602
    Abstract: Provided is an electric motor capable of cooling a stator without being increased in size with a small number of components and even with simple work. The electric motor includes ring-shaped sealing members (34) having flexibility and being arranged on an inner diameter side of a stator coil (22) so as to surround inner diameter portions of coil ends. Cooling oil flowing from an upper part of a housing into the housing flows downward through coil end oil paths (37, 38) formed by the sealing members (34), coil end covers (32, 33), and the coil ends.
    Type: Grant
    Filed: February 11, 2016
    Date of Patent: October 16, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshiaki Kitta, Manabu Yoshinori, Tadashi Murakami, Yukitaka Sakata, Katsunari Takagi, Koichi Ojima, Masaya Inoue
  • Patent number: 9960649
    Abstract: A coolant flow path structure which cools a rotor is configured of a first coolant flow path forming a radial coolant flow path of the rotor and a second coolant flow path communicating with the first coolant flow path and forming an axial coolant flow path of the rotor, and a negative pressure structure, which brings an exist of the coolant flow path structure into a negative pressure as a result of a rotation of the rotor, is provided at the exit of the second coolant flow path.
    Type: Grant
    Filed: August 31, 2015
    Date of Patent: May 1, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Manabu Yoshinori, Yoshiaki Kitta, Koichi Ojima, Hiroyuki Higashino, Toshiya Chazono, Masaki Horii
  • Publication number: 20180115211
    Abstract: The rotary electric machine according to the present invention includes: a ring-shaped electrically insulating holder in which a plurality of groove portions are formed concentrically; a plurality of strip-shaped electrically conductive members that are formed so as to have strip-shaped bodies that have a rectangular cross section, and that are housed in each of the groove portions; and connecting conductors that each include: a circumferentially extending portion that extends circumferentially at the first axial end of the electrically insulating holder so as to be parallel to the strip-shaped electrically conductive member; and a radially extending portion that extends in a radial direction from an end portion at an opposite end of the circumferentially extending portion from the strip-shaped electrically conductive member by means of a bent portion, the radially extending portion at an opposite end from the bent portion being connected to the coil terminal.
    Type: Application
    Filed: March 31, 2015
    Publication date: April 26, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Masashi NAKAMURA, Ryuichi KITORA, Akihiro YAMAMURA, Koichi OJIMA, Masaya INOUE
  • Patent number: 9906088
    Abstract: It is an object of the present invention, to provide a rotor-holding structure of a rotating electrical machine for hybrid-vehicle, the structure being capable of ensuring a space is present between a stator and a rotor. A rotating electrical machine includes a stator and a rotor, the stator being fixed to a housing, and the rotor being disposed opposite to stator across a predetermined space, wherein the rotor has a rotor boss section, a rotor core, and a permanent magnet. The rotor boss section is rotatably attached to the housing through a bearing. The rotor core and the permanent magnet are attached to the rotor boss section. Multiple through-holes are provided at the respective corresponding locations of the housing and the rotor boss section. A supporting member is passed through each of the through-holes, thereby holding the rotor boss section.
    Type: Grant
    Filed: April 15, 2013
    Date of Patent: February 27, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Ken Nishikawa, Masaya Inoue, Koichi Ojima
  • Patent number: 9893594
    Abstract: Provided is an armature for a rotating electrical machine, which is capable of improving heat dissipation performance of an edgewise coil to enhance efficiency of the rotating electrical machine. The armature for a rotating electrical machine includes: a core including a yoke section and a tooth section that protrudes from the yoke section; an edgewise coil to be inserted onto the tooth section through intermediation of an insulating member, the edgewise coil being formed by winding a rectangular wire having a rectangular conductor cross-section through edgewise bending; and a heat transfer member filled into a gap between the tooth section and the edgewise coil. The armature has different gaps formed at two regions between the tooth section and a long side of the edgewise coil.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: February 13, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shinichiro Yoshida, Shuichi Tamura, Masaya Inoue, Akihiro Yamamura, Koichi Ojima, Shogo Okamoto, Yutaro Shirai
  • Publication number: 20170271958
    Abstract: In order to efficiently cool a stator and rotor of a rotating electrical machine, cooling oil is supplied by a pump in a pressurized state to a first reservoir portion provided in an upper portion inside a housing, and after the cooling oil is ejected from the first reservoir portion, the cooling oil is guided to a stator coil end cooling structure, and to a rotor bearing and rotor core cooling structure, using the weight of the cooling oil itself.
    Type: Application
    Filed: October 28, 2014
    Publication date: September 21, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yoshiaki KITTA, Koichi OJIMA, Katsunari TAKAGI, Masaya INOUE, Hiroyuki HIGASHINO
  • Publication number: 20170063201
    Abstract: Provided is an electric motor capable of cooling a stator without being increased in size with a small number of components and even with simple work. The electric motor includes ring-shaped sealing members (34) having flexibility and being arranged on an inner diameter side of a stator coil (22) so as to surround inner diameter portions of coil ends. Cooling oil flowing from an upper part of a housing into the housing flows downward through coil end oil paths (37, 38) formed by the sealing members (34), coil end covers (32, 33), and the coil ends.
    Type: Application
    Filed: February 11, 2016
    Publication date: March 2, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yoshiaki KITTA, Manabu YOSHINORI, Tadashi MURAKAMI, Yukitaka SAKATA, Katsunari TAKAGI, Koichi OJIMA, Masaya INOUE
  • Patent number: 9570953
    Abstract: A rotary electric machine includes: a stator around which a coil is wound; a frame which fixes the stator; a rotor which faces the stator via a slight air gap; a shaft which is fixed to the rotor and is rotatably and removably supported via a bearing; and a bracket which supports the bearing inside a bearing box. The rotary electric machine includes: an insulating member which is mounted inside the bearing box of the bracket; a metal holder which is mounted inside the insulating member with a predetermined clearance with respect to an outer ring of the bearing, and supports the bearing; and a pressing body which is mounted between the side surface of the metal holder and the side surface of the outer ring of the bearing.
    Type: Grant
    Filed: March 21, 2014
    Date of Patent: February 14, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Soichi Sato, Masaya Inoue, Koichi Ojima, Keigo Maeda
  • Publication number: 20160322874
    Abstract: A coolant flow path structure which cools a rotor is configured of a first coolant flow path forming a radial coolant flow path of the rotor and a second coolant flow path communicating with the first coolant flow path and forming an axial coolant flow path of the rotor, and a negative pressure structure, which brings an exist of the coolant flow path structure into a negative pressure as a result of a rotation of the rotor, is provided at the exit of the second coolant flow path.
    Type: Application
    Filed: August 31, 2015
    Publication date: November 3, 2016
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Manabu YOSHINORI, Yoshiaki KITTA, Koichi OJIMA, Hiroyuki HIGASHINO, Toshiya CHAZONO, Masaki HORII
  • Publication number: 20160294257
    Abstract: An electric rotating machine that can raise the utilization efficiency of cooling oil is obtained. In an rotation axle, there are provided an oil flow path having a predetermined length from an end of the rotation axle and a flow path hole that communicates with the oil flow path and has an opening toward the inside of the electric rotating machine; a supporting member includes a cylinder section and a disk section that partitions the cylinder section in the axis direction, and a discharging hole is provided at an end of the cylinder section; between the flow path hole and the discharging hole, there is provided a partition plate that encloses a space formed by the supporting member and the rotation axle and guides cooling oil traveling from the flow path hole to the inside of the electric rotating machine to the discharging hole.
    Type: Application
    Filed: May 21, 2015
    Publication date: October 6, 2016
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Tadashi MURAKAMI, Yukitaka SAKATA, Yoshiaki KITTA, Katsunari TAKAGI, Koichi OJIMA, Masaya INOUE
  • Publication number: 20160118858
    Abstract: In the rotary electric machine according to the present invention, a first O-ring 13a is mounted between a pair of position regulating members 12 that are press-fitted onto and held in a vicinity of a second axial end of an outer circumferential surface of a stator core housing portion 10a so as to be spaced apart in an axial direction, and is pressed and held between the stator core housing portion 10a and a cylindrical portion 16, and a second O-ring 13b is mounted into an O-ring housing groove 11 that is recessed into an outer circumferential surface of a frame mounting portion 10b, and is pressed and held between the frame mounting portion 10b and the cylindrical portion 16, such that a coolant channel 22 is formed between the frame 10 and the cylindrical portion 16.
    Type: Application
    Filed: June 14, 2013
    Publication date: April 28, 2016
    Applicant: Mitsubishi Electric Corporation
    Inventors: Koichi OJIMA, Naoki OHASHI
  • Patent number: 9300174
    Abstract: The objective is to prevent the flange of a ring member for holding the stator core from enlarging the diameter of a rotating electric machine and to eliminate a screwing space and a pedestal portion in the housing case so as to suppress the weight of the rotating electric machine from increasing; one end of the ring member for holding the stator core protrudes from the outer circumference of the stator core toward the rotation axle and the ring member is fixed to the cover or the housing case at the protruding portion.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: March 29, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Naoki Ohashi, Koichi Ojima