Patents by Inventor Yutaka Matsunobu

Yutaka Matsunobu 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).

  • Publication number: 20210119558
    Abstract: An object of the invention is to reduce a torque pulsation. A control device of a rotary electric machine according to the invention includes a sinusoidal wave generation circuit which generates a sinusoidal wave signal according to a magnetic pole position of a rotor of the rotary electric machine, a current command circuit which generates a speed command, a torque command based on actual speed information, and a current command on the basis of the sinusoidal wave signal, and a current control circuit which controls an inverter circuit interposed between a stator winding and a DC power source to make a sinusoidal current flow to the stator winding on the basis of the current command and a current detection signal of the stator winding of the rotary electric machine, wherein the current control circuit periodically changes a current phase of the sinusoidal current when the rotary electric machine is driven by a predetermined torque and a predetermined rotation frequency.
    Type: Application
    Filed: January 29, 2018
    Publication date: April 22, 2021
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Yutaka MATSUNOBU, Katsuhiro HOSHINO
  • Patent number: 10862361
    Abstract: A stator includes: multi-phase stator coils each having a salient pole concentrated winding; a stator iron core formed with a plurality of teeth around which the multi-phase stator coils are wound; and a plurality of connection rings configured to connect each of the multi-phase stator coils, wherein a winding end position of each of the multi-phase stator coils is disposed closest to the corresponding connection ring among the plurality of connection rings.
    Type: Grant
    Filed: July 28, 2016
    Date of Patent: December 8, 2020
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventor: Yutaka Matsunobu
  • Patent number: 10666109
    Abstract: The coil ends in a rotating electric machine are to be made smaller in size. A stator coil 60 inserted into a slot 420 in a stator of a rotating electric machine is formed with segment coils 28 connected to one another. In the stator coil 60, the segment coils 28 each include an insulating coated portion coated with an insulating coating, and a slit 900 or a recess is formed in the insulating coated portion of each of the segment coils 28 at a coil end 140. The slit 900 or the recess is preferably formed between a diagonal conductor portion 28D and a conductor-end straight portion 28E of each segment coil 28.
    Type: Grant
    Filed: July 27, 2016
    Date of Patent: May 26, 2020
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Kenichi Nakayama, Tomohiro Fukuda, Takashi Genmoto, Hiromitsu Okamoto, Mitsuaki Mirumachi, Yutaka Matsunobu
  • Patent number: 10530207
    Abstract: An object is to provide a rotary electric machine capable of suppressing degradation of strength in high-speed rotation and reducing a torque ripple. A rotor of a rotary electric machine according to the present invention includes a rotor core provided with a magnet insertion hole that forms a space into which a permanent magnet is inserted and a non-magnetic portion facing the space to form a part of the magnet insertion hole, wherein the non-magnetic portion is provided asymmetrically with respect to a d-axis.
    Type: Grant
    Filed: November 11, 2015
    Date of Patent: January 7, 2020
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Akihito Nakahara, Yutaka Matsunobu
  • Publication number: 20190267861
    Abstract: The coil ends in a rotating electric machine are to be made smaller in size. A stator coil 60 inserted into a slot 420 in a stator of a rotating electric machine is formed with segment coils 28 connected to one another. In the stator coil 60, the segment coils 28 each include an insulating coated portion coated with an insulating coating, and a slit 900 or a recess is formed in the insulating coated portion of each of the segment coils 28 at a coil end 140. The slit 900 or the recess is preferably formed between a diagonal conductor portion 28D and a conductor-end straight portion 28E of each segment coil 28.
    Type: Application
    Filed: July 27, 2016
    Publication date: August 29, 2019
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Kenichi NAKAYAMA, Tomohiro FUKUDA, Takashi GENMOTO, Hiromitsu OKAMOTO, Mitsuaki MIRUMACHI, Yutaka MATSUNOBU
  • Publication number: 20180294686
    Abstract: The present invention provides a stator for a rotating electric machine that has a high efficiency and an excellent cooling performance. The stator of the present invention, includes: a stator iron core having a plurality of slots; and coil windings made by connecting segment conductors and disposed in the slots, in which each slot contains two or more of the coil windings electrically connected in parallel and at least one of the coil windings electrically connected in series with the coil windings connected in parallel.
    Type: Application
    Filed: April 27, 2016
    Publication date: October 11, 2018
    Inventors: Itsurou SAWADA, Yutaka MATSUNOBU, Akihito NAKAHARA
  • Publication number: 20180248431
    Abstract: To prevent disconnection of the stator of the rotating electric machine. A stator includes: multi-phase stator coils each having a salient pole concentrated winding; a stator iron core formed with a plurality of teeth around which the multi-phase stator coils are wound; and a plurality of connection rings configured to connect each of the multi-phase stator coils, wherein a winding end position of each of the multi-phase stator coils is disposed closest to the corresponding connection ring among the plurality of connection rings.
    Type: Application
    Filed: July 28, 2016
    Publication date: August 30, 2018
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventor: Yutaka MATSUNOBU
  • Patent number: 9957413
    Abstract: A resin composition (601) containing the following is prepared: a base unsaturated-polyester resin and/or a base vinyl-ester resin; a base radical-polymerizable monomer; a radical-polymerizable monomer having a thermally latent isocyanate group; a photo-radical polymerization initiator; and an alkylborane and/or an alkoxyamine derivative. A stator coil (60) in a stator (20) in a dynamo-electric machine (10) is coated using said resin composition (601) only, i.e. just the one resin composition. An insulated coated section (29A) and a conductor-exposing section (29B) of a join-side coil end (62) are also coated using said resin composition (601).
    Type: Grant
    Filed: May 16, 2014
    Date of Patent: May 1, 2018
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Takahito Muraki, Satoshi Yamamura, Masahiko Honma, Yutaka Matsunobu
  • Patent number: 9917487
    Abstract: A rotating electric machine allowing a rotor and a stator thereof to assume any of various numbers of poles and any of various numbers of slots and enabling a reduction in vibration and noise is provided. The rotating electric machine according to the present invention includes a stator having a plurality of teeth and a plurality of slots, which is configured so that the shape of the front ends of the teeth and the opening width of the slots are made to change cyclically F times along the circumferential direction (F is a natural number equal to or greater than 2).
    Type: Grant
    Filed: January 22, 2014
    Date of Patent: March 13, 2018
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Kanako Nemoto, Hidetoshi Koka, Yutaka Matsunobu, Yasuyuki Saito
  • Publication number: 20170346355
    Abstract: An object is to provide a rotary electric machine capable of suppressing degradation of strength in high-speed rotation and reducing a torque ripple. A rotor of a rotary electric machine according to the present invention includes a rotor core provided with a magnet insertion hole that forms a space into which a permanent magnet is inserted and a non-magnetic portion facing the space to form a part of the magnet insertion hole, wherein the non-magnetic portion is provided asymmetrically with respect to a d-axis.
    Type: Application
    Filed: November 11, 2015
    Publication date: November 30, 2017
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Akihito NAKAHARA, Yutaka MATSUNOBU
  • Publication number: 20170256997
    Abstract: Provided is a stator of a rotary electric machine excellent in insulation property and productivity, and a rotary electric machine equipped therewith. A stator of a rotary electric machine includes a stator core that is provided with a plurality of slots; and a stator coil that is provided in the slots, wherein N (herein, N is a positive even number) segment conductors are provided in each slot, wherein the stator coil is configured such that the plurality of segment conductors are connected through welding portions, each of which is provided in a conductor end portion of each segment conductor, wherein the conductor end portions are arranged in an annular shape in a circumferential direction in a coil end in an axial direction, and N annular rows are configured, and wherein directions of punching burr portions of a stator slot and the stator core on an inner-diameter side of the stator are inverted to a direction of a punching burr portion of the stator core on an outer-diameter side of the stator.
    Type: Application
    Filed: August 17, 2015
    Publication date: September 7, 2017
    Inventors: Kenichi NAKAYAMA, Yutaka MATSUNOBU, Hisaya SHIMIZU, Tomohiro FUKUDA
  • Patent number: 9748806
    Abstract: A permanent magnet rotating electrical machine includes a rotor which has permanent magnets buried in a plurality of permanent magnet insertion slots that are provided in a rotor core, and the rotor is rotatably supported by a rotary shaft with a gap on the inner peripheral side of a stator. When the axis of magnetic flux for the permanent magnet is set as a d-axis and the position deviated from the d-axis by electrical angle of 90° is set as a q-axis, the permanent magnet insertion slot is located on the q-axis and a first permanent magnet magnetized in the direction orthogonal to the q-axis is buried in the permanent magnet insertion slot. The permanent magnet insertion slot is located on the d-axis and a second permanent magnet magnetized in the direction parallel to the d-axis is buried in the permanent magnet insertion slot, while at least one or more third permanent magnets buried in the permanent magnet insertion slots are provided between the first permanent magnet and the second permanent magnet.
    Type: Grant
    Filed: March 25, 2013
    Date of Patent: August 29, 2017
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Hidetoshi Koka, Satoshi Kikuchi, Yutaka Matsunobu, Yasuyuki Saito, Sadahiro Hamahata
  • Patent number: 9680341
    Abstract: Provided is a rotating electric machine that combines high efficiency and high strength reliability. The rotating electric machine includes: a stator having a coil and a stator core; and a rotor opposed to the stator with a gap intervening between the rotor and the stator, the rotor having permanent magnets 3 and a rotor core 2. The rotor is configured such that the permanent magnets are buried in V-shape at hole-shaped slots 4 disposed in the rotor core to form one pole, and the pole is formed in plurality in a circumferential direction. Each of the slots is an open slot partially opened toward an outer circumference of the rotor core. The slot is provided with a hook-shaped structure 6 to support corresponding one of the permanent magnets in an open portion thereof.
    Type: Grant
    Filed: July 29, 2013
    Date of Patent: June 13, 2017
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Norio Takeda, Satoshi Kikuchi, Yutaka Matsunobu
  • Publication number: 20160376466
    Abstract: A resin composition (601) containing the following is prepared: a base unsaturated-polyester resin and/or a base vinyl-ester resin; a base radical-polymerizable monomer; a radical-polymerizable monomer having a thermally latent isocyanate group; a photo-radical polymerization initiator; and an alkylborane and/or an alkoxyamine derivative. A stator coil (60) in a stator (20) in a dynamo-electric machine (10) is coated using said resin composition (601) only, i.e. just the one resin composition. An insulated coated section (29A) and a conductor-exposing section (29B) of a join-side coil end (62) are also coated using said resin composition (601).
    Type: Application
    Filed: May 16, 2014
    Publication date: December 29, 2016
    Inventors: Takahito MURAKI, Satoshi YAMAMURA, Masahiko HONMA, Yutaka MATSUNOBU
  • Patent number: 9496773
    Abstract: A rotating electrical machine includes a stator and a rotor. The stator winding includes a plurality of conductor segments inserted through the slots from one end surface of the stator core with end portions of the conductor segments projecting out beyond another end surface of the stator core. The conductor segments include an undeformed portion, a plastically deformed portion formed at the end portions thereof and a tapered portion. The plastically deformed portion has a dimension of the plastically deformed portion along a circumferential direction that is greater than a dimension of the undeformed portion along the circumferential direction and so that a dimension of the plastically deformed portion along a radial direction is smaller than a dimension of the undeformed portion along the radial direction. The conductor segments are welded together at tops of the plastically deformed portions thereof.
    Type: Grant
    Filed: December 13, 2012
    Date of Patent: November 15, 2016
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Takashi Ishigami, Yutaka Matsunobu, Yoshimi Mori
  • Patent number: 9425666
    Abstract: A stator includes: a stator core with N pieces of slots ranging along an axial direction, which are formed side-by-side along a circumferential direction; and a stator winding installed in the slots at the stator winding. The stator winding includes a plurality of winding groups, each made up with N pieces of lap-wound coils each formed by winding a conductor wire a plurality of times. The winding groups are disposed in a plurality of layers set side-by-side along a radial direction at the stator core. One coil side at each of the lap-wound coils is inserted in a specific slot on an inner side along the radial direction in a specific layer and another coil side of the lap-wound coil is inserted in another slot on an outer side along the radial direction in the specific layer.
    Type: Grant
    Filed: April 13, 2012
    Date of Patent: August 23, 2016
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Takashi Ishigami, Yutaka Matsunobu
  • Publication number: 20160056684
    Abstract: A rotating electric machine allowing a rotor and a stator thereof to assume any of various numbers of poles and any of various numbers of slots and enabling a reduction in vibration and noise is provided. The rotating electric machine according to the present invention includes a stator having a plurality of teeth and a plurality of slots, which is configured so that the shape of the front ends of the teeth and the opening width of the slots are made to change cyclically F times along the circumferential direction (F is a natural number equal to or greater than 2).
    Type: Application
    Filed: January 22, 2014
    Publication date: February 25, 2016
    Inventors: Kanako NEMOTO, Hidetoshi KOKA, Yutaka MATSUNOBU, Yasuyuki SAITO
  • Publication number: 20150236555
    Abstract: Provided is a rotating electric machine that combines high efficiency and high strength reliability. The rotating electric machine includes: a stator having a coil and a stator core; and a rotor opposed to the stator with a gap intervening between the rotor and the stator, the rotor having permanent magnets 3 and a rotor core 2. The rotor is configured such that the permanent magnets are buried in V-shape at hole-shaped slots 4 disposed in the rotor core to form one pole, and the pole is formed in plurality in a circumferential direction. Each of the slots is an open slot partially opened toward an outer circumference of the rotor core. The slot is provided with a hook-shaped structure 6 to support corresponding one of the permanent magnets in an open portion thereof.
    Type: Application
    Filed: July 29, 2013
    Publication date: August 20, 2015
    Inventors: Norio Takeda, Satoshi Kikuchi, Yutaka Matsunobu
  • Patent number: 9059607
    Abstract: A gear-integrated electric motor is provided with a motor (1) generating a driving force by input of electricity, a gear mechanism (2) converting the driving force of the motor, and a housing (8) containing the motor and the gear mechanism, and used in a horizontal position in which a motor shaft (1s) and a gear output shaft (2s) become substantially horizontal. The gear-integrated electric motor includes at least one heat pipe (3) which has an evaporation portion (3e) disposed in a motor area of the housing, and a condensation portion (3c) disposed in a gear mechanism area of the housing and higher than the evaporation portion with respect to the vertical direction in the horizontal position.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: June 16, 2015
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Shuichi Terakado, Hideaki Mori, Yutaka Matsunobu, Satoshi Yamamura
  • Publication number: 20150115758
    Abstract: A permanent magnet rotating electrical machine includes a rotor which has permanent magnets buried in a plurality of permanent magnet insertion slots that are provided in a rotor core, and the rotor is rotatably supported by a rotary shaft with a gap on the inner peripheral side of a stator. When the axis of magnetic flux for the permanent magnet is set as a d-axis and the position deviated from the d-axis by electrical angle of 90° is set as a q-axis, the permanent magnet insertion slot is located on the q-axis and a first permanent magnet magnetized in the direction orthogonal to the q-axis is buried in the permanent magnet insertion slot. The permanent magnet insertion slot is located on the d-axis and a second permanent magnet magnetized in the direction parallel to the d-axis is buried in the permanent magnet insertion slot, while at least one or more third permanent magnets buried in the permanent magnet insertion slots are provided between the first permanent magnet and the second permanent magnet.
    Type: Application
    Filed: March 25, 2013
    Publication date: April 30, 2015
    Inventors: Hidetoshi Koka, Satoshi Kikuchi, Yutaka Matsunobu, Yasuyuki Saito, Sadahiro Hamahata