Patents by Inventor Masahiro Seguchi

Masahiro Seguchi 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: 10756661
    Abstract: A field winding type rotating electric machine, whose power factor is cos ?, includes a stator, a rotor with a field winding, a rectifying element, a drive unit and a control unit. When performing rectangular-wave or overmodulation energization, the control unit generates a voltage pulse pair, which induces a current pulse pair, by: setting a reference time to the center of an ON duration or OFF duration of a control signal of a first phase; and providing a temporary ON duration and a temporary OFF duration after a predetermined angle from the reference time. The predetermined angle is within a predetermined range including cos?1 ? in electrical angle. The temporary ON duration is provided to temporarily turn ON a control signal of a second phase during an OFF duration thereof. The temporary OFF duration is provided to temporarily turn OFF a control signal of a third phase during an ON duration thereof.
    Type: Grant
    Filed: June 13, 2019
    Date of Patent: August 25, 2020
    Assignee: DENSO CORPORATION
    Inventors: Masahiro Seguchi, Junichi Nakazono
  • Publication number: 20200251940
    Abstract: A field coil type rotating electric machine includes a field coil having a serially-connected coil section pair consisting of first and second coil sections, a diode having its cathode and anode respectively connected to opposite ends of the serially-connected coil section pair, a rotating shaft, and a rotor having main pole portions radially protruding from a rotor core. In the rotating electric machine, there are formed both a series resonance circuit including the first coil section and at least one capacitor and a parallel resonance circuit including the second coil section and the at least one capacitor. Electronic components electrically connected with the field coil, which include the diode and the at least one capacitor, are arranged so that an overall center of gravity of all the electronic components is located closer than each of centers of gravity of the electronic components to a central axis of the rotating shaft.
    Type: Application
    Filed: January 31, 2020
    Publication date: August 6, 2020
    Applicant: DENSO CORPORATION
    Inventor: Masahiro SEGUCHI
  • Patent number: 10727773
    Abstract: A field winding type rotating electric machine includes: a stator armature winding wound on a stator core; a rotor field winding wound on a rotor core; a rectifying element connected to both ends of the rotor field winding; a capacitor having one end connected to one end of the rectifying element and the other end connected between the two ends of the rotor field winding; and a control circuit configured to supply electric current, which includes a fundamental component for generating rotational torque and a harmonic component having a shorter period than the fundamental component and superimposed on the fundamental component, to the stator armature winding and thereby induce excitation current in the rotor field winding. Moreover, an inductance of the rotor field winding and a capacitance of the capacitor are in a resonant relationship with a frequency of the harmonic component.
    Type: Grant
    Filed: June 21, 2019
    Date of Patent: July 28, 2020
    Assignee: DENSO CORPORATION
    Inventors: Masahiro Seguchi, Junichi Nakazono
  • Publication number: 20190312539
    Abstract: A field winding type rotating electric machine includes: a stator armature winding wound on a stator core; a rotor field winding wound on a rotor core; a rectifying element connected to both ends of the rotor field winding; a capacitor having one end connected to one end of the rectifying element and the other end connected between the two ends of the rotor field winding; and a control circuit configured to supply electric current, which includes a fundamental component for generating rotational torque and a harmonic component having a shorter period than the fundamental component and superimposed on the fundamental component, to the stator armature winding and thereby induce excitation current in the rotor field winding. Moreover, an inductance of the rotor field winding and a capacitance of the capacitor are in a resonant relationship with a frequency of the harmonic component.
    Type: Application
    Filed: June 21, 2019
    Publication date: October 10, 2019
    Applicant: DENSO CORPORATION
    Inventors: Masahiro SEGUCHI, Junichi NAKAZONO
  • Publication number: 20190296672
    Abstract: A field winding type rotating electric machine, whose power factor is cos ?, includes a stator, a rotor with a field winding, a rectifying element, a drive unit and a control unit. When performing rectangular-wave or overmodulation energization, the control unit generates a voltage pulse pair, which induces a current pulse pair, by: setting a reference time to the center of an ON duration or OFF duration of a control signal of a first phase; and providing a temporary ON duration and a temporary OFF duration after a predetermined angle from the reference time. The predetermined angle is within a predetermined range including cos?1 ? in electrical angle. The temporary ON duration is provided to temporarily turn ON a control signal of a second phase during an OFF duration thereof. The temporary OFF duration is provided to temporarily turn OFF a control signal of a third phase during an ON duration thereof.
    Type: Application
    Filed: June 13, 2019
    Publication date: September 26, 2019
    Applicant: DENSO CORPORATION
    Inventors: Masahiro SEGUCHI, Junichi NAKAZONO
  • Publication number: 20190207491
    Abstract: A field winding type rotary machine includes a stator having a stator core and a stator coil wound on the stator core, a rotor having a rotor core and a rotor field coil wound on the rotor core, and a rectifier element connected between both ends of the rotor field coil. The field winding type rotary machine includes a capacitor having a first terminal connected to an anode terminal of the rectifier element and a second terminal connected to any point of the rotor field coil.
    Type: Application
    Filed: March 8, 2019
    Publication date: July 4, 2019
    Applicant: DENSO CORPORATION
    Inventor: Masahiro SEGUCHI
  • Patent number: 10333371
    Abstract: A stator includes a stator core, a winding, and a temperature sensor. In the stator core, a plurality of slots are formed in a circumferential direction of the stator. The winding is formed by a plurality of conductors which are housed in the slots and are electrically connected. The slots are formed such that a predetermined number of the conductors are housed and arrayed in a radial direction of the stator. The temperature sensor is located in at least one of the slots and detects temperature of the conductors.
    Type: Grant
    Filed: January 6, 2014
    Date of Patent: June 25, 2019
    Assignee: DENSO CORPORATION
    Inventors: Yuki Takahashi, Hideaki Suzuki, Masahiro Seguchi
  • Patent number: 10250175
    Abstract: A field winding synchronous machine drive system includes a field winding synchronous machine having a stator and a rotor and a drive apparatus configured to drive the field winding synchronous machine. The stator has N m-phase stator coils wound on a stator core to create a rotating magnetic field, where N is an integer not less than 2 and m is an integer not less than 3. The rotor has at least one main field winding wound on a rotor core to create field magnetic flux. The drive apparatus includes N inverters each of which supplies m-phase alternating current to a corresponding one of the N m-phase stator coils. Specifically, each of the inverters supplies the corresponding m-phase stator coil with the m-phase alternating current which includes a fundamental-wave current and a time-harmonic current superimposed on the fundamental-wave current; the time-harmonic current has a shorter period than the fundamental-wave current.
    Type: Grant
    Filed: December 19, 2016
    Date of Patent: April 2, 2019
    Assignee: DENSO CORPORATION
    Inventor: Masahiro Seguchi
  • Patent number: 9876455
    Abstract: A field winding type synchronous machine has a stator having a stator core to which a stator coil is wound, and a rotor that rotates while facing a peripheral surface of the stator with an electromagnetic gap therebetween. The rotor includes a rotor core having a plurality of main pole portions and interpole portions, main pole windings wound around the main pole portions, interpole windings wound around the interpole portions, and a full-wave rectifier circuit for energizing the field current to the main pole windings. The interpole windings produce the induced current by a magnetic flux generated by a time harmonic current superimposed on a fundamental wave of the stator coil. The electromagnetic gaps between the interpole portions and a circumferential surface of the stator are configured larger than electromagnetic between the main pole portions and the circumferential surface of the stator.
    Type: Grant
    Filed: May 13, 2016
    Date of Patent: January 23, 2018
    Assignee: DENSO CORPORATION
    Inventor: Masahiro Seguchi
  • Patent number: 9847684
    Abstract: A stator includes a hollow cylindrical stator core and a stator coil. The stator core has a plurality of slots formed therein. The stator coil is provided in the slots of the stator core in a plurality of layers in a radial direction of the stator core, and includes a first winding and a second winding. The first winding extends around the stator core so as to be located at the (2n?1)th and 2nth layers of the stator coil, and has an end located at the 2nth layer, where n is a natural number. The second winding extends around the stator core so as to be located at the (2n+1)th and (2n+2)th layers of the stator coil, and has an end located at the (2n+1)th layer. The ends of the first and second windings, which are respectively located at the 2nth and (2n+1)th layers, are electrically connected to each other.
    Type: Grant
    Filed: November 1, 2013
    Date of Patent: December 19, 2017
    Assignee: DENSO CORPORATION
    Inventors: Hideaki Suzuki, Masahiro Seguchi, Yuki Takahashi
  • Patent number: 9831731
    Abstract: In a stator having a stator core and phase windings, slots are formed in the stator core and each slot accommodates conductors in a layer structure from one end to the other end of the slot in a radial direction of the stator core. The phase windings in one phase have conductors accommodated in a first slot and a second slot which are adjacently formed in the stator core. An electrical connection between the conductors in a n-th layer and the conductors in a (n+1)-th layer includes that the conductors accommodated in the first slot are electrically connected together, the conductors accommodated in the second slot are electrically connected together, and the conductors accommodated in the first slot are electrically connected with the conductors accommodated in the second slot. This connection eliminates a phase difference in the first slot and the second slot in a distributed winding structure.
    Type: Grant
    Filed: November 6, 2013
    Date of Patent: November 28, 2017
    Assignee: DENSO CORPORATION
    Inventors: Hideaki Suzuki, Masahiro Seguchi, Yuki Takahashi, Shinsuke Sugiura
  • Publication number: 20170179864
    Abstract: A field winding synchronous machine drive system includes a field winding synchronous machine having a stator and a rotor and a drive apparatus configured to drive the field winding synchronous machine. The stator has N m-phase stator coils wound on a stator core to create a rotating magnetic field, where N is an integer not less than 2 and m is an integer not less than 3. The rotor has at least one main field winding wound on a rotor core to create field magnetic flux. The drive apparatus includes N inverters each of which supplies m-phase alternating current to a corresponding one of the N m-phase stator coils. Specifically, each of the inverters supplies the corresponding m-phase stator coil with the m-phase alternating current which includes a fundamental-wave current and a time-harmonic current superimposed on the fundamental-wave current; the time-harmonic current has a shorter period than the fundamental-wave current.
    Type: Application
    Filed: December 19, 2016
    Publication date: June 22, 2017
    Applicant: DENSO CORPORATION
    Inventor: Masahiro SEGUCHI
  • Patent number: 9673674
    Abstract: In a stator having a stator core and three phase windings, slots are formed in the stator core. The phase winding are accommodated in layers, from one side to the other side in the corresponding slot along a radial direction of the stator core. The phase windings are arranged in a star-delta composite connection structure. The phase winding in each phase is comprised of conductors accommodated in a first slot and a second slot adjacently arranged in the stator core so that the conductor in the n-th layer is electrically connected to the conductor in the (n+1)-th layer, ascending order, per slot. Because each winding has the same length and no difference in electric potential occurs between the star connection and the delta connection, this structure suppress generation of operation noise and a circulating current through the stator core and prevents loss due to the circulating current.
    Type: Grant
    Filed: November 6, 2013
    Date of Patent: June 6, 2017
    Assignee: DENSO CORPORATION
    Inventors: Yuki Takahashi, Masahiro Seguchi, Hideaki Suzuki
  • Patent number: 9647502
    Abstract: A stator includes an annular stator core, a stator coil and a resin adhesive. The stator coil is comprised of a plurality of electric wires. The electric wires are partially received in slots of the stator core so that the stator coil has a pair of coil end parts protruding outside the slots respectively from opposite axial end faces of the stator core. The resin adhesive is filled in the slots of the stator core and/or applied to the coil end parts of the stator coil. Moreover, each of the electric wires includes an electric conductor and an insulating coat that covers an outer surface of the electric conductor. The insulating coat is two-layer structured to include an inner coat and an outer coat. The adhesion strength of the outer coat to the resin adhesive is lower than the adhesion strength of the inner coat to the resin adhesive.
    Type: Grant
    Filed: May 8, 2015
    Date of Patent: May 9, 2017
    Assignee: DENSO CORPORATION
    Inventors: Yuki Takahashi, Masahiro Seguchi
  • Publication number: 20160336891
    Abstract: A field winding type synchronous machine has a stator having a stator core to which a stator coil is wound, and a rotor that rotates while facing a peripheral surface of the stator with an electromagnetic gap therebetween. The rotor includes a rotor core having a plurality of main pole portions and interpole portions, main pole windings wound around the main pole portions, interpole windings wound around the interpole portions, and a full-wave rectifier circuit for energizing the field current to the main pole windings. The interpole windings produce the induced current by a magnetic flux generated by a time harmonic current superimposed on a fundamental wave of the stator coil. The electromagnetic gaps between the interpole portions and a circumferential surface of the stator are configured larger than electromagnetic between the main pole portions and the circumferential surface of the stator.
    Type: Application
    Filed: May 13, 2016
    Publication date: November 17, 2016
    Applicant: DENSO CORPORATION
    Inventor: Masahiro SEGUCHI
  • Patent number: 9484790
    Abstract: A rotor for an electric rotating machine includes a hollow cylindrical rotor core and a plurality of magnets. The rotor core has a plurality of magnet-receiving holes formed therein. Each of the magnet-receiving holes has a plurality of wall surfaces including a radially innermost wall surface which is positioned radially innermost among the plurality of wall surfaces. Each of the magnets is received in a corresponding one of the magnet-receiving holes of the rotor core. Further, each of the magnets is arranged in the corresponding magnet-receiving hole so that among the thermal resistances between the magnet and the plurality of wall surfaces of the corresponding magnet-receiving hole, the thermal resistance between the magnet and the radially innermost wall surface of the corresponding magnet-receiving hole is lowest.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: November 1, 2016
    Assignee: DENSO CORPORATION
    Inventors: Yuki Takahashi, Masahiro Seguchi, Hideaki Suzuki
  • Patent number: 9391480
    Abstract: A rotating electric machine includes a rotor, a stator and an Insulating resin. The stator includes a stator core and a stator coil that is partially received in slots of the stator core so as to have a pair of coil end parts protruding outside of the slots respectively on opposite axial sides of the stator core. The stator coil is formed of a plurality of electric wire segments, each of which includes an electric conductor and an Insulating coat that covers an outer surface of the electric conductor. The insulating resin is applied to the coil end parts of the stator coil so as to cover the outer surfaces of the insulating coats of the electric wire segments forming the stator coil. Further, a tensile strength of the insulating coats of the electric wire segments is higher than an adhesion strength between the insulating resin and the insulating coats.
    Type: Grant
    Filed: December 27, 2013
    Date of Patent: July 12, 2016
    Assignee: DENSO CORPORATION
    Inventors: Masahiro Seguchi, Shinsuke Sugiura, Hideaki Suzuki, Hideyuki Yagi
  • Patent number: 9373985
    Abstract: A stator includes an annular stator core and a three-phase stator coil. The stator coil is comprised of a plurality of star-connected phase windings. The stator coil further has a plurality of interphase bridging wires to electrically connect neutral point-side ends of the phase windings to each other. The interphase bridging wires are arranged on a coil end of the stator coil. At least one of the interphase bridging wires is made up of at least one busbar. The busbar includes three or four connecting end portions each having a joining surface joined to one of the phase windings, other bridging wires and other busbars. The connecting end portions are arranged so that some of the joining surfaces of the connecting end portions face substantially in the circumferential direction of the stator core, while the other joining surfaces face substantially in a radial direction of the stator core.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: June 21, 2016
    Assignee: DENSO CORPORATION
    Inventors: Shinsuke Sugiura, Yuki Takahashi, Masahiro Seguchi
  • Patent number: 9236775
    Abstract: A rotary electric machine includes a stator and a rotor located in a rotatable manner relative to the stator via a gap. The stator includes a multi-phase stator winding that is held in a plurality of slots formed in the stator. The rotor includes at least one magnet section embedded therein so as to face the slots. The magnet section includes a plurality of axially laminated magnets with a skew angle which is an angle of a positional difference between the magnets. This skew angle ?s is set so as to satisfy ?s=k?/2 where ? is a slot pitch which is an angle between the slots, and k is a coefficient set based on: an arc ratio ?a being an angle covering an area in which magnetic flux radially flows from the magnetic section; and a slot factor S being a ratio of the slots relative to the magnet section.
    Type: Grant
    Filed: April 12, 2013
    Date of Patent: January 12, 2016
    Assignee: DENSO CORPORATION
    Inventors: Yuki Takahashi, Masahiro Seguchi
  • Publication number: 20150326086
    Abstract: A stator includes an annular stator core, a stator coil and a resin adhesive. The stator coil is comprised of a plurality of electric wires. The electric wires are partially received in slots of the stator core so that the stator coil has a pair of coil end parts protruding outside the slots respectively from opposite axial end faces of the stator core. The resin adhesive is filled in the slots of the stator core and/or applied to the coil end parts of the stator coil. Moreover, each of the electric wires includes an electric conductor and an insulating coat that covers an outer surface of the electric conductor. The insulating coat is two-layer structured to include an inner coat and an outer coat. The adhesion strength of the outer coat to the resin adhesive is lower than the adhesion strength of the inner coat to the resin adhesive.
    Type: Application
    Filed: May 8, 2015
    Publication date: November 12, 2015
    Inventors: Yuki TAKAHASHI, Masahiro SEGUCHI