Patents by Inventor Masafumi Sakuma

Masafumi Sakuma 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: 20200028397
    Abstract: A rotating electrical machine includes a stator including a plurality of slots on which conductive wire is wound, and a rotor facing the stator and including a plurality of magnetic poles, wherein the rotating electrical machine is configured of fractional slot in which a denominator of an irreducible fraction obtained by dividing a number of the slots of the stator by a number of phases and a number of the magnetic poles of the rotor is equal to or greater than four, and ratio of magnitude of magnetomotive force of each phase is even in respective poles of the magnetic poles of the rotor.
    Type: Application
    Filed: May 22, 2019
    Publication date: January 23, 2020
    Applicant: AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Masafumi SAKUMA, Teppei TSUDA
  • Publication number: 20190267855
    Abstract: A rotary electric machine in which a moving direction of the mover relative to the stator as a first direction, an opposing direction in which the stator and the mover oppose to each other as a second direction and a direction perpendicular to any direction of the first direction and the second direction as a third direction are defined and one of the stator and the mover includes a first reference portion which is a reference to skew and a continuous skew portion arranged in the third direction by being gradually shifted in the first direction relative to the first reference portion. The maximum value of a skew amount of the continuous skew portion relative to the first reference portion is set to have the maximum value of the relative skew amount between the stator and the mover to be one slot pitch worth of the plurality of slots.
    Type: Application
    Filed: September 6, 2017
    Publication date: August 29, 2019
    Applicant: AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Masafumi Sakuma, Teppei Tsuda
  • Publication number: 20190260277
    Abstract: A rotor for a rotary electric machine, wherein: magnet insertion holes are formed, each defined by the plurality of through holes communicating with each other in the axial direction across the plurality of magnetic sheets; and each of the permanent magnets is twisted about the center axis so as to be placed into a corresponding one of the magnet insertion holes, each having opposite ends in the axial direction that are shifted from each other by an angle corresponding to the constant angle, from outside in the axial direction.
    Type: Application
    Filed: November 22, 2017
    Publication date: August 22, 2019
    Applicants: AISIN AW CO., LTD., AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Masayuki IKEMOTO, Teppei TSUDA, Masafumi SAKUMA
  • Patent number: 10361599
    Abstract: A three-phase rotating electrical machine includes a stator including a stator core provided with a plurality of teeth and a plurality of slots, and winding, the three-phase rotating electrical machine including a rotor including a rotor core and a north magnetic pole and a south magnetic pole, the three-phase rotating electrical machine including a fractional slot configuration, the rotor core including a north magnetic pole acting portion, a south magnetic pole acting portion, a magnetic pole boundary dividing the north magnetic pole acting portion and the south magnetic pole acting portion in the circumferential direction, and a magnetic resistance portion, the magnetic resistance portion restricting the magnetic flux from passing through.
    Type: Grant
    Filed: September 29, 2016
    Date of Patent: July 23, 2019
    Assignee: AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Teppei Tsuda, Masafumi Sakuma
  • Publication number: 20190140507
    Abstract: A rotating electrical machine with a fractional slot structure includes concentrically wound stator coils, and a method of manufacturing the same. In a rotating electrical machine, a plurality of unit coils included in the stator coil are allocated into a first pole coil and a second pole coil in units of slots that oppose a pair of movable element magnetic poles. Further, each pole pair coil forming a plurality of phase coils is provided with two types of the unit coils, namely a full-coil and a half-coil. In addition, in each pole pair coil, the coil pitches between pairs of coil sides of the plurality of unit coils forming said pole pair coil are different from one another, and each pole pair coil is provided with one half-coil.
    Type: Application
    Filed: December 19, 2016
    Publication date: May 9, 2019
    Applicant: AISIN SEIKI KABUSHIKI KAISHA
    Inventor: Masafumi Sakuma
  • Publication number: 20190115795
    Abstract: A rotary electric apparatus having a fractional slot configuration in which a number of slots per every pole and per every phase is not an integer includes: a stator which includes a stator core formed with a plurality of slots, and a stator winding having a plurality of coil sides accommodated in the plurality of slots and a plurality of coil ends connecting each of same side end portions of the plurality of coil sides; and a mover which is movably supported with respect to the stator, and includes a mover core and a plurality of mover magnetic poles installed in the mover core.
    Type: Application
    Filed: October 11, 2018
    Publication date: April 18, 2019
    Applicant: AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Masafumi Sakuma, Teppei Tsuda
  • Publication number: 20180358857
    Abstract: A rotating electric machine having a fraction slot configuration in which the number of slots per pole per phase is not an integer includes: a stator that includes a stator core provided with a plurality of slots, and a stator winding having a plurality of coil sides accommodated in the plurality of slots and a plurality of coil ends connecting the same side end parts of the plurality of coil sides to each other; and a movable element that is supported to be movable with respect to the stator, and includes a movable element core, and a plurality of movable element magnetic poles provided in the movable element core. The stator winding includes a plurality of basic coils in which the magnitude of magnetomotive force generated by the plurality of coil sides forming the one-phase band is uniform in each of the plurality of movable element magnetic poles.
    Type: Application
    Filed: June 8, 2018
    Publication date: December 13, 2018
    Applicant: AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Masafumi SAKUMA, Teppei TSUDA
  • Patent number: 10122232
    Abstract: A rotary electric machine includes a stator including a stator winding and a rotor movable relative to the stator in a first direction and arranged to face the stator in a second direction, the rotor including plural pairs of rotor poles at a rotor core, each pair of the plural pairs of rotor poles including different polarities from each other, the stator including a fractional slot configuration where the number of slots per pole per phase is a non-integer, the stator winding being wound by a fractional slot winding, one of a stator core and the rotor core including a base portion and either a single position portion or plural position portions which is connected to the base portion in a third direction and which is displaced relative to the base portion in the first direction, the third direction being orthogonal to the first direction and the second direction.
    Type: Grant
    Filed: February 25, 2016
    Date of Patent: November 6, 2018
    Assignee: AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Masafumi Sakuma, Teppei Tsuda
  • Publication number: 20180254677
    Abstract: Reduction in drive torque of a permanent magnet motor having a skew arrangement is to be suppressed. A permanent magnet motor has a rotor including a rotor core formed as a stacked assembly of a plurality of electromagnetic steel sheets stacked one upon another and magnets accommodated within accommodation holes formed inside the rotor core. The rotor core has a skew arrangement including a first core and a second core that are displaced relative to each other in a circumferential direction relative to an axis of the rotor. The accommodation hole of the first core accommodates a first magnet of the magnets. The accommodation hole of the second core accommodates a second magnet of the magnets. The first magnet and the second magnet are opposed to each other via a first gap therebetween in the direction of the axis.
    Type: Application
    Filed: October 19, 2016
    Publication date: September 6, 2018
    Applicant: AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Masako SHIBAMORI, Gyoo MA, Masafumi SAKUMA
  • Publication number: 20170093237
    Abstract: A three-phase rotating electrical machine includes a stator including a stator core provided with a plurality of teeth and a plurality of slots, and winding, the three-phase rotating electrical machine including a rotor including a rotor core and a north magnetic pole and a south magnetic pole, the three-phase rotating electrical machine including a fractional slot configuration, the rotor core including a north magnetic pole acting portion, a south magnetic pole acting portion, a magnetic pole boundary dividing the north magnetic pole acting portion and the south magnetic pole acting portion in the circumferential direction, and a magnetic resistance portion, the magnetic resistance portion restricting the magnetic flux from passing through.
    Type: Application
    Filed: September 29, 2016
    Publication date: March 30, 2017
    Applicant: Aisin Seiki Kabushiki Kaisha
    Inventors: Teppei TSUDA, Masafumi SAKUMA
  • Publication number: 20160285336
    Abstract: A rotary electric machine includes a stator including a stator winding and a rotor movable relative to the stator in a first direction and arranged to face the stator in a second direction, the rotor including plural pairs of rotor poles at a rotor core, each pair of the plural pairs of rotor poles including different polarities from each other, the stator including a fractional slot configuration where the number of slots per pole per phase is a non-integer, the stator winding being wound by a fractional slot winding, one of a stator core and the rotor core including a base portion and either a single position portion or plural position portions which is connected to the base portion in a third direction and which is displaced relative to the base portion in the first direction, the third direction being orthogonal to the first direction and the second direction.
    Type: Application
    Filed: February 25, 2016
    Publication date: September 29, 2016
    Applicant: Aisin Seiki Kabushiki Kaisha
    Inventors: Masafumi SAKUMA, Teppei TSUDA
  • Patent number: 9325211
    Abstract: A wave winding coil for a rotary electrical machine includes a coil conductor including coil side portions and coil end portions, the coil conductor being wound to include a wave winding configuration, a relational expression expressing a total number of the coil side portions included in a phase coil is expressed by a mathematical expression 1 m×k=n×q×2p, and m refers to the number of the phase unit coils that are parallelly connected to each other, k refers to the number of the coil side portions that are serially connected to each other, q refers to the number of serially-connected-conductors per magnetic pole, the serially-connected-conductor belongs to one of the kinds of the coil side portions, 2p refers to the number of the magnetic pole, m refers to a common divisor between q×2p and n.
    Type: Grant
    Filed: December 17, 2012
    Date of Patent: April 26, 2016
    Assignee: AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Masafumi Sakuma, Tomohiro Fukushima, Shuhei Yamashita
  • Patent number: 8578904
    Abstract: An engine starting method in a parallel-type hybrid vehicle comprises a motor reverse rotation driving step of applying reverse rotation current to drivingly rotate a motor output shaft in a reverse rotation direction of an engine output shaft whereby an elastic member in a damper is elastically deformed to store an urging force that urges the motor output shaft in a normal rotation direction; an urged normal rotation step of stopping the electrification to release the urging force having been stored at the motor reverse rotation driving step whereby the motor output shaft is rotated in the normal rotation direction; a motor normal rotation driving step of applying normal rotation current to drivingly rotate the motor output shaft in the normal rotation direction; and an engine start igniting step of igniting an engine with the engine output shaft being rotated by the rotation at the motor normal rotation driving step.
    Type: Grant
    Filed: February 14, 2011
    Date of Patent: November 12, 2013
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventor: Masafumi Sakuma
  • Patent number: 8541917
    Abstract: A stator assembly structure of a rotary electrical machine for assembling a stator on a case includes the stator including a stator holder and a stator core, the stator holder including a flange portion that includes a plurality of positioning bores arranged at intervals and a fixing portion fixing the stator to the case, the case including a positioning pin having an outer diameter smaller than a diameter of each of the positioning bores and being engageable with each of the positioning bores, the case further including a fixing seat, and each of the positioning bores including at least three bending portions that extend from a peripheral edge of the positioning bore towards a radially inward side, each of the bending portions being formed to be bent at a portion in a length direction from the peripheral edge towards the radially inward side relative to the flange portion.
    Type: Grant
    Filed: February 25, 2011
    Date of Patent: September 24, 2013
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Masafumi Sakuma, Tomohiro Sato
  • Patent number: 8471420
    Abstract: A rotating electrical machine includes a stator including a coil, a case accommodating the stator and oil, an external connection terminal block arranged at an outer circumferential portion of the case and connecting the coil to an external device, a terminal box arranged at the outer circumferential portion and including a case connecting hole and an external connecting hole respectively in connection with an inner portion of the case and an external atmosphere, the terminal box accommodating the external connection terminal block, a coil wiring member connecting an end portion of the coil to the external connection terminal block by penetrating through the case connecting hole, an external device wiring member connecting the external connection terminal block to the external device by penetrating through the external connecting hole, and a case connecting hole sealing member fixed to the coil wiring member to seal the case connecting hole by fitting thereinto.
    Type: Grant
    Filed: November 17, 2010
    Date of Patent: June 25, 2013
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Shigetaka Isogai, Masafumi Sakuma
  • Patent number: 8358041
    Abstract: An electric motor having a wire connection structure includes a stator including a stator coil, a rotor, a motor housing accommodating the stator and the rotor and having a hole, a cable retaining portion formed on the motor housing for retaining end portions of feed cables, a fixing portion formed on the stator, first terminals connected to the stator coil and arranged on the fixing portion in an orientation different from an orientation of the end portions, second terminals each projecting from each of the end portions to face the corresponding first terminal after being inserted into the hole, at least one of the second terminals being bent, and screw members engaged with the fixing portion after being inserted into the corresponding first and second terminals, each of the screw members jointly fastening the first and second terminals to the fixing portion to electrically connect the first and second terminals.
    Type: Grant
    Filed: June 18, 2010
    Date of Patent: January 22, 2013
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Shigetaka Isogai, Masafumi Sakuma, Ryoji Mizutani
  • Patent number: 8319382
    Abstract: An electric motor includes a stator having a stator coil, a rotor, a motor housing having a through hole, a fixing portion extending from the stator within the motor housing towards the through hole, a load receiving member inserted into the through hole and having a through bore, a conductive member connected to an electric power supply wire member and arranged at a first end portion of the load receiving member, a first terminal connected to the stator coil and provided between a second end portion of the load receiving member and the fixing portion, and a screw bolt fixing the conductive member, the load receiving member and the first terminal on the fixing portion, so that the load receiving member is press-fixedly sandwiched by the conductive member and the first terminal so that an electric power flows therebetween via the load receiving member.
    Type: Grant
    Filed: June 18, 2010
    Date of Patent: November 27, 2012
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Shigetaka Isogai, Masafumi Sakuma, Ryoji Mizutani
  • Publication number: 20120234282
    Abstract: An engine starting method in a parallel-type hybrid vehicle comprises a motor reverse rotation driving step of applying reverse rotation current to drivingly rotate a motor output shaft in a reverse rotation direction of an engine output shaft whereby an elastic member in a damper is elastically deformed to store an urging force that urges the motor output shaft in a normal rotation direction; an urged normal rotation step of stopping the electrification to release the urging force having been stored at the motor reverse rotation driving step whereby the motor output shaft is rotated in the normal rotation direction; a motor normal rotation driving step of applying normal rotation current to drivingly rotate the motor output shaft in the normal rotation direction; and an engine start igniting step of igniting an engine with the engine output shaft being rotated by the rotation at the motor normal rotation driving step.
    Type: Application
    Filed: February 14, 2011
    Publication date: September 20, 2012
    Applicant: AISIN SEIKI KABUSHIKI KAISHA
    Inventor: Masafumi Sakuma
  • Patent number: 8258670
    Abstract: A motor includes a stator, a case and a supporting portion. The stator formed by laminating plural disc plates includes a yoke portion having a plurality of first and second portions alternately formed in a circumferential direction of the stator, and plural tooth portions respectively radially protruding from an inner circumferential surface the yoke portion at the second portion of the yoke portion towards an axial center of the stator. The case provided at an outer circumference of the stator includes a first communicating passage extending in an axial direction of the stator to be in communication with both axial ends of the stator and defined by an inner circumferential surface of the case. The supporting portion protrudes from an inner circumferential surface of the first communicating passage towards the stator and contacts an outer surface of the stator at one of the first portions of the stator.
    Type: Grant
    Filed: October 31, 2008
    Date of Patent: September 4, 2012
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Masafumi Sakuma, Tomohiro Fukushima, Masayuki Nishimura
  • Patent number: 8195348
    Abstract: Front left and right wheel units are driven by an engine and a motor generator. Rear left and right wheel units are independently driven by in-wheel motor type motor generators. The motor generator and the motor generator are configured to have different rated outputs, respectively, and be subjected to different speed reduction ratios, respectively, between the motor generators and their respectively associated drive wheel units, and thus have characteristics, respectively, in efficiency with respect to torque and vehicular speed, that exhibit high efficiency in mutually different output ranges, respectively. When a mileage oriented mode is selected as a traveling mode, an ECU determines how a drive torque should be allocated between the motor generators, as based on the motors' required drive torque and vehicular speed and on each motor generator's characteristic in efficiency, to maximize the motor generators' total efficiency.
    Type: Grant
    Filed: May 18, 2007
    Date of Patent: June 5, 2012
    Assignees: Toyota Jidosha Kabushiki Kaisha, Aisin Seiki Kabushiki Kaisha
    Inventors: Ryoji Mizutani, Michitaka Tsuchida, Yasuaki Tahara, Tomohiro Fukushima, Masafumi Sakuma