Patents by Inventor Hisashi FUJIHARA

Hisashi FUJIHARA 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: 10727722
    Abstract: A stator includes core pieces in which at least first and second laminate members are laminated, the first laminate member includes a first tooth portion and a first core back portion, the second laminate member includes a second tooth portion and a second core back portion, the first core back portion includes a first protrusion on one side thereof in a circumferential direction and a first recess on the other side thereof in the circumferential direction, the second core back portion includes a second recess on one side thereof in a circumferential direction and a second protrusion on the other side thereof in the circumferential direction, and an area of a region in which the first and second core back portions of the core piece adjacent thereto overlap in a lamination direction is greater than a circumferential cross-sectional area of the first core back portion circumferentially inward from the first protrusion.
    Type: Grant
    Filed: February 22, 2019
    Date of Patent: July 28, 2020
    Assignee: NIDEC CORPORATION
    Inventors: Yasuaki Nakahara, Takayuki Migita, Hiroshi Kitagaki, Takeshi Honda, Hisashi Fujihara
  • Patent number: 10530227
    Abstract: A manufacturing method comprising: a process S1 of forming a plate member which has a substantially annular scrap portion having a center hole through an axial direction and a core plate portion defining a portion of the core pieces arranged continuously with the scrap portion on a radially inner side of the scrap portion; a process S2 of forming a laminated body, which has the core pieces, by laminating the plate member; a process S3 of providing the laminated body and the shaft in a mold; a process S4 of forming a molding body by inserting a molten resin or a nonmagnetic material in the mold and forming the filling portion of which at least a portion is located between the core pieces; and a process S5 of separating the scrap portion and the core plate portion.
    Type: Grant
    Filed: May 19, 2016
    Date of Patent: January 7, 2020
    Assignee: NIDEC CORPORATION
    Inventors: Takeshi Honda, Yosuke Yamada, Yasuaki Nakahara, Hisashi Fujihara, Takayuki Migita, Tsuyoshi Nakamura
  • Publication number: 20190386545
    Abstract: A motor includes a magnet rotating together with a rotor about a central axis, a substrate on which a sensor to detect a position of the magnet is installed, a housing to hold a stator to drive the rotor, a bearing assembly including a bearing holder, and a conductor assembly between the housing and the bearing assembly. The conductor assembly includes a conductor including a first conductor electrically connected to the sensor through the substrate and a conductor holder covering the conductor. The substrate is fixed to the conductor holder. In the radial direction, a gap is located between an outer side surface of the bearing holder and an inner side surface of the conductor holder, and at least a portion of the magnet is located in the gap.
    Type: Application
    Filed: January 6, 2018
    Publication date: December 19, 2019
    Applicant: Nidec Corporation
    Inventors: Shuhei NAKAMATSU, Takayuki MIGITA, Hisashi FUJIHARA, Masato AONO, Takashi SHIRAISHI
  • Publication number: 20190386535
    Abstract: A stator includes a stator core disposed about a central axis and covered by an insulator, coils installed on the stator core through the insulator, and an intermediate bus bar electrically connected to a portion of a conducting wire constituting the coils. A method of manufacturing a stator includes a mounting process, a winding process, and a connecting process. An intermediate bus bar is supported at a first position spaced apart from a coil in an axial direction in a mounting portion before the start of the winding process. The intermediate bus bar is fixed at a second position between the first position and the coils in the axial direction after the completion of the winding process.
    Type: Application
    Filed: January 6, 2018
    Publication date: December 19, 2019
    Applicant: Nidec Corporation
    Inventors: Takashi SHIRAISHI, Takayuki MIGITA, Hisashi FUJIHARA, Masato AONO, Shuhei NAKAMATSU
  • Patent number: 10505408
    Abstract: A stator includes core pieces in which at least first and second laminate members are laminated, the first laminate member includes a first tooth portion and a first core back portion, the second laminate member includes a second tooth portion and a second core back portion, the first core back portion includes a first protrusion on one side thereof in a circumferential direction and a first recess on another side thereof in the circumferential direction, the second core back portion includes a second recess on one side thereof in a circumferential direction and a second protrusion on the other side thereof in the circumferential direction, and an area of a region in which the first core back portion and the second core back portion of the core piece adjacent thereto overlap in a lamination direction is greater than a circumferential cross-sectional area of the first core back portion circumferentially inward from the first protrusion.
    Type: Grant
    Filed: February 22, 2019
    Date of Patent: December 10, 2019
    Assignee: NIDEC CORPORATION
    Inventors: Yasuaki Nakahara, Takayuki Migita, Hiroshi Kitagaki, Takeshi Honda, Hisashi Fujihara
  • Publication number: 20190319504
    Abstract: A rotor includes a rotor core including laminated thin plate cores. A single thin plate core includes an inner plate portion defining a portion of an inner core portion and outer plate portions defining a portion of an outer core portion. At least some of the laminated thin plate cores include a connecting portion. A number of connecting portion is one or a plurality, and, when the number of connecting portions is a plurality, the connecting portions at positions other than both left and right sides of each other in a circumferential direction, and, in plan view, the thin plate core includes the connecting portion at a position different from that of a connecting portion in another thin plate core adjacent in an axial direction.
    Type: Application
    Filed: November 2, 2017
    Publication date: October 17, 2019
    Inventors: Takashi SHIRAISHI, Takeshi HONDA, Junichi UNO, Hisashi FUJIHARA, Yasuaki NAKAHARA, Keisuke SAITO
  • Publication number: 20190296601
    Abstract: A motor includes a rotor including a shaft centered on a vertically extending center axis, a stator radially opposite to the rotor and including coils, a bearing supporting the shaft, and a bus bar unit on an upper side in an axial direction of the stator. The bus bar unit includes bus bars including a terminal portion connected to a lead wire drawn out from the coil and a bus bar holder holding the bus bars. The terminal portion includes a slit which extends axially downward and into which the lead wire is fitted. The width of the slit is narrower than the diameter of the lead wire.
    Type: Application
    Filed: August 25, 2017
    Publication date: September 26, 2019
    Inventors: Yuhei YAMAGUCHI, Ryusuke SATO, Hisashi FUJIHARA, Keigo NAKAMURA
  • Patent number: 10404125
    Abstract: A stator includes conductive wires wound around teeth, and slots between adjacent teeth in a circumferential direction. The conductive wires include conductive wires of three phases corresponding to a U-phase, a V-phase, and a W-phase, and the conductive wires are delta connected. Coils, in which any one of the conductive wires is wound around the teeth, are repeatedly disposed in order of the U-phase, the V-phase, and the W-phase in the circumferential direction. In each of the U-phase, the V-phase, and the W-phase, at least two coils are connected in series and adjacent in the circumferential direction. A direction in which the U-phase and W-phase conductive wires are wound around the teeth and a direction in which the V-phase conductive wire is wound around the tooth are opposite.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: September 3, 2019
    Assignee: NIDEC CORPORATION
    Inventors: Yasuaki Nakahara, Takayuki Migita, Hisashi Fujihara, Tsuyoshi Nakamura
  • Publication number: 20190190356
    Abstract: A stator includes core pieces in which at least first and second laminate members are laminated, the first laminate member includes a first tooth portion and a first core back portion, the second laminate member includes a second tooth portion and a second core back portion, the first core back portion includes a first protrusion on one side thereof in a circumferential direction and a first recess on the other side thereof in the circumferential direction, the second core back portion includes a second recess on one side thereof in a circumferential direction and a second protrusion on the other side thereof in the circumferential direction, and an area of a region in which the first and second core back portions of the core piece adjacent thereto overlap in a lamination direction is greater than a circumferential cross-sectional area of the first core back portion circumferentially inward from the first protrusion.
    Type: Application
    Filed: February 22, 2019
    Publication date: June 20, 2019
    Inventors: Yasuaki NAKAHARA, Takayuki MIGITA, Hiroshi KITAGAKI, Takeshi HONDA, Hisashi FUJIHARA
  • Publication number: 20190190325
    Abstract: A stator includes core pieces in which at least first and second laminate members are laminated, the first laminate member includes a first tooth portion and a first core back portion, the second laminate member includes a second tooth portion and a second core back portion, the first core back portion includes a first protrusion on one side thereof in a circumferential direction and a first recess on another side thereof in the circumferential direction, the second core back portion includes a second recess on one side thereof in a circumferential direction and a second protrusion on the other side thereof in the circumferential direction, and an area of a region in which the first core back portion and the second core back portion of the core piece adjacent thereto overlap in a lamination direction is greater than a circumferential cross-sectional area of the first core back portion circumferentially inward from the first protrusion.
    Type: Application
    Filed: February 22, 2019
    Publication date: June 20, 2019
    Inventors: Yasuaki NAKAHARA, Takayuki MIGITA, Hiroshi KITAGAKI, Takeshi HONDA, Hisashi FUJIHARA
  • Publication number: 20190190357
    Abstract: A stator includes core pieces in which at least first and second laminate members are laminated, the first laminate member includes a first tooth portion and a first core back portion, the second laminate member includes a second tooth portion and a second core back portion, positions of both circumferential ends of the first core back portion are different from positions of both circumferential ends of the second core back portion, the first core back portion and the second core back portion have an inclined or curved shape at a lower side of one side thereof in the circumferential direction or the other side thereof in the circumferential direction which overlaps the core piece adjacent thereto, and the inclined or curved shape of the first core back portion and the second core back portion is at a portion protruding in the circumferential direction with respect to the second core back portion and the first core back portion in a plan view.
    Type: Application
    Filed: February 22, 2019
    Publication date: June 20, 2019
    Inventors: Yasuaki NAKAHARA, Takayuki MIGITA, Hiroshi KITAGAKI, Takeshi HONDA, Hisashi FUJIHARA
  • Publication number: 20190190326
    Abstract: A stator includes a core with an annular shape including a center that is a vertically extending central axis. The core includes core pieces in which first and second laminate members are laminated. The first laminate member includes a first tooth portion extending in a radial direction and a first core back portion extending in a circumferential direction. The first core back portion includes a first protrusion on one side thereof in the circumferential direction and a first recess on the other side thereof in the circumferential direction. The second laminate member includes a second tooth portion extending in a radial direction and a second core back portion extending in a circumferential direction. The second core back portion includes a second recess on one side thereof in the circumferential direction and a second protrusion on the other side thereof in the circumferential direction.
    Type: Application
    Filed: February 22, 2019
    Publication date: June 20, 2019
    Inventors: Yasuaki NAKAHARA, Takayuki MIGITA, Hiroshi KITAGAKI, Takeshi HONDA, Hisashi FUJIHARA
  • Publication number: 20190068009
    Abstract: A stator includes an annular core including a central axis. The core includes core pieces including first and second laminate members. The first laminate member includes a first tooth portion extending in a radial direction, and a first core back portion connected to the first tooth portion and extending in a circumferential direction. The second laminate member includes a second tooth portion extending in a radial direction, and a second core back portion connected to the second tooth portion and extending in a circumferential direction. Positions of circumferential ends of the first core back portion are different from positions of circumferential ends of the second core back. The first core back portion includes a first protrusion on one side thereof in the first circumferential direction. The first protrusion is in contact with one of the core pieces adjacent thereto at one point.
    Type: Application
    Filed: October 25, 2018
    Publication date: February 28, 2019
    Inventors: Yasuaki NAKAHARA, Takayuki MIGITA, Hiroshi KITAGAKI, Takeshi HONDA, Hisashi FUJIHARA
  • Publication number: 20190036406
    Abstract: A stator includes conductive wires wound around teeth, and slots between adjacent teeth in a circumferential direction. The conductive wires include conductive wires of three phases corresponding to a U-phase, a V-phase, and a W-phase, and the conductive wires are delta connected. Coils, in which any one of the conductive wires is wound around the teeth, are repeatedly disposed in order of the U-phase, the V-phase, and the W-phase in the circumferential direction. In each of the U-phase, the V-phase, and the W-phase, at least two coils are connected in series and adjacent in the circumferential direction. A direction in which the U-phase and W-phase conductive wires are wound around the teeth and a direction in which the V-phase conductive wire is wound around the tooth are opposite.
    Type: Application
    Filed: September 28, 2018
    Publication date: January 31, 2019
    Inventors: Yasuaki NAKAHARA, Takayuki MIGITA, Hisashi FUJIHARA, Tsuyoshi NAKAMURA
  • Patent number: 10103606
    Abstract: A case includes a cylindrical housing arranged to hold a stator, and having an opening portion at a top thereof; and a motor cover fitted to an upper side of the housing, and arranged to cover an upper side of the stator. A busbar unit includes a sensor busbar electrically connected to a rotation sensor, and a busbar holder arranged at the opening portion to hold the sensor busbar. The case includes a case through hole arranged to open into a space outside of the case. The busbar holder includes a cylindrical holder body portion having at least a portion thereof arranged radially inside of the opening portion; and a protruding portion arranged to protrude out of the case, and having at least a portion thereof arranged in the case through hole. A gap is defined circumferentially between the protruding portion and an edge of the case through hole.
    Type: Grant
    Filed: May 4, 2016
    Date of Patent: October 16, 2018
    Assignee: NIDEC CORPORATION
    Inventors: Yosuke Yamada, Ryusuke Sato, Yasuaki Nakahara, Yusuke Makino, Hisashi Fujihara
  • Patent number: 9601958
    Abstract: A stator portion includes a stator and a bus bar member. The stator includes three coil groups, each coil group includes two or more coils defined by a single conducting wire including a jumper wire. The bus bar member includes three first bus bars to which end portions on one side of the conducting wires of the three coil groups are connected, each of which includes an external connection terminal, a second bus bar defining a neutral point to which end portions on the other side of the conducting wires are connected, and a resin holder which retains the three first bus bars and the second bus bar. The three first bus bars and the second bus bar overlap only in a radial direction centered on the central axis or an axial direction, and the maximum number of bus bars which overlap is 2.
    Type: Grant
    Filed: October 17, 2013
    Date of Patent: March 21, 2017
    Assignee: NIDEC CORPORATION
    Inventors: Yuhei Yamaguchi, Hisashi Fujihara
  • Publication number: 20160352199
    Abstract: A manufacturing method comprising: a process S1 of forming a plate member which has a substantially annular scrap portion having a center hole through an axial direction and a core plate portion defining a portion of the core pieces arranged continuously with the scrap portion on a radially inner side of the scrap portion; a process S2 of forming a laminated body, which has the core pieces, by laminating the plate member; a process S3 of providing the laminated body and the shaft in a mold; a process S4 of forming a molding body by inserting a molten resin or a nonmagnetic material in the mold and forming the filling portion of which at least a portion is located between the core pieces; and a process S5 of separating the scrap portion and the core plate portion.
    Type: Application
    Filed: May 19, 2016
    Publication date: December 1, 2016
    Inventors: Takeshi HONDA, Yosuke YAMADA, Yasuaki NAKAHARA, Hisashi FUJIHARA, Takayuki MIGITA, Tsuyoshi NAKAMURA
  • Publication number: 20160352189
    Abstract: A case includes a cylindrical housing arranged to hold a stator, and having an opening portion at a top thereof; and a motor cover fitted to an upper side of the housing, and arranged to cover an upper side of the stator. A busbar unit includes a sensor busbar electrically connected to a rotation sensor, and a busbar holder arranged at the opening portion to hold the sensor busbar. The case includes a case through hole arranged to open into a space outside of the case. The busbar holder includes a cylindrical holder body portion having at least a portion thereof arranged radially inside of the opening portion; and a protruding portion arranged to protrude out of the case, and having at least a portion thereof arranged in the case through hole. A gap is defined circumferentially between the protruding portion and an edge of the case through hole.
    Type: Application
    Filed: May 4, 2016
    Publication date: December 1, 2016
    Inventors: Yosuke YAMADA, Ryusuke SATO, Yasuaki NAKAHARA, Yusuke MAKINO, Hisashi FUJIHARA
  • Publication number: 20150188376
    Abstract: A stator portion includes a stator and a bus bar member. The stator includes three coil groups, each coil group includes two or more coils defined by a single conducting wire including a jumper wire. The bus bar member includes three first bus bars to which end portions on one side of the conducting wires of the three coil groups are connected, each of which includes an external connection terminal, a second bus bar defining a neutral point to which end portions on the other side of the conducting wires are connected, and a resin holder which retains the three first bus bars and the second bus bar. The three first bus bars and the second bus bar overlap only in a radial direction centered on the central axis or an axial direction, and the maximum number of bus bars which overlap is 2.
    Type: Application
    Filed: October 17, 2013
    Publication date: July 2, 2015
    Inventors: Yuhei Yamaguchi, Hisashi Fujihara
  • Patent number: 8779641
    Abstract: In a busbar unit, which is a distributing device arranged to supply electrical currents to coils, a busbar holder is arranged to support coil connection busbars and sensor connection busbars. Conductor wire connection portions of the coil connection busbars are exposed on both axial sides and welded to a conductor wire defining the coils. The sensor connection busbars are combined with a plurality of electronic components to define a Hall IC circuit designed to output and receive electrical signals to or from Hall ICs. Sensor connection portions of the sensor connection busbars are exposed on both axial sides, and welded to terminals of the Hall ICs. Electronic component connection portions of the sensor connection busbars are exposed on both axial sides, and welded to the electronic components.
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: July 15, 2014
    Assignee: Nidec Corporation
    Inventors: Yoshio Fujii, Hisashi Fujihara, Kenichiro Hamagishi, Yosuke Yamada