Patents by Inventor Keiko Murota

Keiko Murota 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: 8093776
    Abstract: A rotary electrical machine has a mechanism capable of varying an output characteristic, without increasing mechanical loss, or without consuming the electric power that does not contribute to increasing torque. The rotary electrical machine has a rotor with N pole and S pole magnets alternately and fixedly disposed thereon. An end surface, (which opposes the rotor), of each of a plurality of first teeth positioned on a first stator section is broader than that of the opposite surface thereof, and a winding is wound around a portion between both of the end surfaces. A second stator section has second teeth, corresponding the number of the first teeth, and which has no winding. The second teeth are disposed to oppose the end surfaces of the respective first teeth, and each second tooth is reciprocally movable between a reference position at which the second tooth directly opposes the respective first tooth and a maximum movable position located at the right center position between the respective end surfaces.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: January 10, 2012
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Haruyoshi Hino, Keiko Murota
  • Publication number: 20110133592
    Abstract: A rotary electrical machine has a mechanism capable of varying an output characteristic, without increasing mechanical loss, or without consuming the electric power that does not contribute to increasing torque. The rotary electrical machine has a rotor with N pole and S pole magnets alternately and fixedly disposed thereon. An end surface, (which opposes the rotor), of each of a plurality of first teeth positioned on a first stator section is broader than that of the opposite surface thereof, and a winding is wound around a portion between both of the end surfaces. A second stator section has second teeth, corresponding the number of the first teeth, and which has no winding. The second teeth are disposed to oppose the end surfaces of the respective first teeth, and each second tooth is reciprocally movable between a reference position at which the second tooth directly opposes the respective first tooth and a maximum movable position located at the right center position between the respective end surfaces.
    Type: Application
    Filed: February 18, 2011
    Publication date: June 9, 2011
    Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventors: Haruyoshi HINO, Keiko MUROTA
  • Patent number: 7906884
    Abstract: A rotary electrical machine has a mechanism capable of varying an output characteristic, without increasing mechanical loss, or without consuming the electric power that does not contribute to increasing torque. The rotary electrical machine has a rotor with N pole and S pole magnets alternately and fixedly disposed thereon. An end surface, (which opposes the rotor), of each of a plurality of first teeth positioned on a first stator section is broader than that of the opposite surface thereof, and a winding is wound around a portion between both of the end surfaces. A second stator section has second teeth, corresponding the number of the first teeth, and which has no winding. The second teeth are disposed to oppose the end surfaces of the respective first teeth, and each second tooth is reciprocally movable between a reference position at which the second tooth directly opposes the respective first tooth and a maximum movable position located at the right center position between the respective end surfaces.
    Type: Grant
    Filed: February 26, 2009
    Date of Patent: March 15, 2011
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Haruyoshi Hino, Keiko Murota
  • Patent number: 7675283
    Abstract: A relative position detection device is designed with multiple Hall Effect sensors. In one embodiment, the multiple Hall Effect sensors comprise two different types of Hall Effect sensors. The two different types can be linear and digital. The output of the sensors is used to determine the position an accelerator control, such as a twist grip, and to control an engine or motor in accordance with the operator demand evidenced by the position of the accelerator control.
    Type: Grant
    Filed: October 13, 2005
    Date of Patent: March 9, 2010
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Haruyoshi Hino, Keiko Murota, Hideki Shirazawa, Junji Terada, Tomohiro Ono
  • Patent number: 7671503
    Abstract: A rotating electric machine whose output characteristics can be easily and freely adjusted and varied even in operation. The rotating electric machine is received in a housing of an electrically driven two-wheeled vehicle. A rotating shaft is connected to a rotor so as to form an axle. A stator is positioned opposite a rotor. A movable member is connected to a rotating member rotated about the rotating shaft by a regulating motor. The movable member is moved in the axial direction of the rotating shaft by the rotation of the rotating member. This movement causes the rotor to be rotatingly moved in the axial direction of the rotating shaft, changing relative position of the rotor and the stator.
    Type: Grant
    Filed: July 9, 2008
    Date of Patent: March 2, 2010
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Shinya Naito, Haruyoshi Hino, Keiko Murota
  • Publication number: 20090224625
    Abstract: A rotary electrical machine has a mechanism capable of varying an output characteristic, without increasing mechanical loss, or without consuming the electric power that does not contribute to increasing torque. The rotary electrical machine has a rotor with N pole and S pole magnets alternately and fixedly disposed thereon. An end surface, (which opposes the rotor), of each of a plurality of first teeth positioned on a first stator section is broader than that of the opposite surface thereof, and a winding is wound around a portion between both of the end surfaces. A second stator section has second teeth, corresponding the number of the first teeth, and which has no winding. The second teeth are disposed to oppose the end surfaces of the respective first teeth, and each second tooth is reciprocally movable between a reference position at which the second tooth directly opposes the respective first tooth and a maximum movable position located at the right center position between the respective end surfaces.
    Type: Application
    Filed: February 26, 2009
    Publication date: September 10, 2009
    Applicant: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Haruyoshi Hino, Keiko Murota
  • Patent number: 7550894
    Abstract: A rotary electrical machine has a mechanism capable of varying an output characteristic, without increasing mechanical loss, or without consuming the electric power that does not contribute to increasing torque. The rotary electrical machine has a rotor with N pole and S pole magnets alternately and fixedly disposed thereon. An end surface, (which opposes the rotor), of each of a plurality of first teeth positioned on a first stator section is broader than that of the opposite surface thereof, and a winding is wound around a portion between both of the end surfaces. A second stator section has second teeth, corresponding the number of the first teeth, and which has no winding. The second teeth are disposed to oppose the end surfaces of the respective first teeth, and each second tooth is reciprocally movable between a reference position at which the second tooth directly opposes the respective first tooth and a maximum movable position located at the right center position between the respective end surfaces.
    Type: Grant
    Filed: December 9, 2005
    Date of Patent: June 23, 2009
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Haruyoshi Hino, Keiko Murota
  • Patent number: 7468568
    Abstract: A rotating electric machine whose output characteristics can be easily and freely adjusted and varied even in operation. The rotating electric machine is received in a housing of an electrically driven two-wheeled vehicle. A rotating shaft is connected to a rotor so as to form an axle. A stator is positioned opposite a rotor. A movable member is connected to a rotating member rotated about the rotating shaft by a regulating motor. The movable member is moved in the axial direction of the rotating shaft by the rotation of the rotating member. This movement causes the rotor to be rotatingly moved in the axial direction o the rotating shaft, changing relative position of the rotor and the stator.
    Type: Grant
    Filed: August 4, 2006
    Date of Patent: December 23, 2008
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Shinya Naito, Haruyoshi Hino, Keiko Murota
  • Publication number: 20080296988
    Abstract: A rotating electric machine whose output characteristics can be easily and freely adjusted and varied even in operation. The rotating electric machine is received in a housing of an electrically driven two-wheeled vehicle. A rotating shaft is connected to a rotor so as to form an axle. A stator is positioned opposite a rotor. A movable member is connected to a rotating member rotated about the rotating shaft by a regulating motor. The movable member is moved in the axial direction of the rotating shaft by the rotation of the rotating member. This movement causes the rotor to be rotatingly moved in the axial direction o the rotating shaft, changing relative position of the rotor and the stator.
    Type: Application
    Filed: July 9, 2008
    Publication date: December 4, 2008
    Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventors: Shinya Naito, Haruyoshi Hino, Keiko Murota
  • Patent number: 7408278
    Abstract: A rotary electric machine capable of optionally adjusting output characteristic and an electric motor vehicle using the rotary electric machine are provided. A rotary electric machine is constituted with: a rotary shaft 220; a rotor 40 connected to the rotary shaft 220; a stator 31 placed opposite the rotor 40; a stepping motor 60 serving as an adjusting motor for adjusting the position of the rotor 40 relative to the stator 31 in the rotary axis direction; and a movable member 47 or the like that is engaged to the rotor 40 and converts the rotation of the adjusting motor 60 into the displacement of the movable member 47 in the axial direction of the rotary shaft 220.
    Type: Grant
    Filed: August 8, 2003
    Date of Patent: August 5, 2008
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Keiko Murota, Shinya Naito, Haruyoshi Hino, Hiroyuki Ishihara, Junji Terada, Tomohiro Ono
  • Publication number: 20080106162
    Abstract: A rotary electrical machine includes a rotational shaft supported by a housing for rotation about an axis, a rotor coupled with the rotational shaft, and a stator fixed to the housing and oriented to face the rotor. A rotor position changing mechanism moves the rotor in an axial direction of the rotational shaft using a portion of a torque transmitted between the rotational shaft and the rotor as a driving force. The rotor position changing mechanism controls the strength of the magnetic field between the rotor and the stator by moving the rotor toward or away from the stator.
    Type: Application
    Filed: January 8, 2008
    Publication date: May 8, 2008
    Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventors: Shinya Naitou, Haruyoshi Hino, Keiko Murota, Hiroyuki Ishihara, Junji Terada, Tomohiro Ono
  • Patent number: 7342342
    Abstract: A rotary electrical machine includes a rotational shaft supported by a housing for rotation about an axis, a rotor coupled with the rotational shaft, and a stator fixed to the housing and oriented to face the rotor. A rotor position changing mechanism moves the rotor in an axial direction of the rotational shaft using a portion of a torque transmitted between the rotational shaft and the rotor as a driving force. The rotor position changing mechanism controls the strength of the magnetic field between the rotor and the stator by moving the rotor toward or away from the stator.
    Type: Grant
    Filed: January 18, 2006
    Date of Patent: March 11, 2008
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Shinya Naitou, Haruyoshi Hino, Keiko Murota, Hiroyuki Ishihara, Junji Terada, Tomohiro Ono
  • Patent number: 7309941
    Abstract: A rotating electric machine according to the present invention includes: a rotation axis extending along a first direction; a first rotor for coupling with the rotation axis to rotate together with the rotation axis; a first stator disposed so as to oppose the first rotor; and a moving mechanism for moving the first rotor so that relative positions of the first rotor and the first stator are changed.
    Type: Grant
    Filed: February 6, 2004
    Date of Patent: December 18, 2007
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Keiko Murota, Shinya Naito, Hiroyuki Ishihara, Haruyoshi Hino, Junji Terada, Tomohiro Ono
  • Patent number: 7268462
    Abstract: This invention provides a rotary electric machine with a high productivity/maintainability. Since the shaft portion 43 or the stepwise drawn portion is formed with a flat face 47 perpendicular to the rotational axis, when the magnetic poles 42 are bonded to the rotor 40, an accurate gap control can be achieved by applying a certain pressure to the magnetic poles with a jig or the like using the perpendicular flat face 47 as reference, or by controlling the distance from the perpendicular flat face 47.
    Type: Grant
    Filed: August 8, 2003
    Date of Patent: September 11, 2007
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Hiroyuki Ishihara, Haruyoshi Hino, Shinya Naito, Keiko Murota, Junji Terada, Tomohiro Ono
  • Patent number: 7231904
    Abstract: A relative position detection-and-control device is designed with multiple Hall Effect sensors. In one embodiment, the multiple Hall Effect sensors comprise two different types of Hall Effect sensors. The two different types can be linear and digital. The output of the sensors is used to determine the position of an accelerator control, such as a twist grip, and to control an engine or motor in accordance with the operator demand evidenced by the position of the accelerator control.
    Type: Grant
    Filed: October 13, 2005
    Date of Patent: June 19, 2007
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Haruyoshi Hino, Keiko Murota, Hideki Shirazawa, Junji Terada, Tomohiro Ono
  • Publication number: 20070029887
    Abstract: A rotating electric machine according to the present invention includes: a rotation axis extending along a first direction; a first rotor for coupling with the rotation axis to rotate together with the rotation axis; a first stator disposed so as to oppose the first rotor; and a moving mechanism for moving the first rotor so that relative positions of the first rotor and the first stator are changed.
    Type: Application
    Filed: February 6, 2004
    Publication date: February 8, 2007
    Inventors: Keiko Murota, Shinya Naito, Hiroyuki Ishihara, Haruyoshi Hino, Junji Terada, Tomohiro Ono
  • Publication number: 20060267436
    Abstract: A rotating electric machine whose output characteristics can be easily and freely adjusted and varied even in operation. The rotating electric machine is received in a housing of an electrically driven two-wheeled vehicle. A rotating shaft is connected to a rotor so as to form an axle. A stator is positioned opposite a rotor. A movable member is connected to a rotating member rotated about the rotating shaft by a regulating motor. The movable member is moved in the axial direction of the rotating shaft by the rotation of the rotating member. This movement causes the rotor to be rotatingly moved in the axial direction o the rotating shaft, changing relative position of the rotor and the stator.
    Type: Application
    Filed: August 4, 2006
    Publication date: November 30, 2006
    Inventors: Shinya Naito, Haruyoshi Hino, Keiko Murota
  • Publication number: 20060181172
    Abstract: A rotary electrical machine includes a rotational shaft supported by a housing for rotation about an axis, a rotor coupled with the rotational shaft, and a stator fixed to the housing and oriented to face the rotor. A rotor position changing mechanism moves the rotor in an axial direction of the rotational shaft using a portion of a torque transmitted between the rotational shaft and the rotor as a driving force. The rotor position changing mechanism controls the strength of the magnetic field between the rotor and the stator by moving the rotor toward or away from the stator.
    Type: Application
    Filed: January 18, 2006
    Publication date: August 17, 2006
    Inventors: Shinya Naitou, Haruyoshi Hino, Keiko Murota, Hiroyuki Ishihara, Junji Terada, Tomohiro Ono
  • Publication number: 20060152104
    Abstract: A rotary electrical machine has a mechanism capable of varying an output characteristic, without increasing mechanical loss, or without consuming the electric power that does not contribute to increasing torque. The rotary electrical machine has a rotor with N pole and S pole magnets alternately and fixedly disposed thereon. An end surface, (which opposes the rotor), of each of a plurality of first teeth positioned on a first stator section is broader than that of the opposite surface thereof, and a winding is wound around a portion between both of the end surfaces. A second stator section has second teeth, corresponding the number of the first teeth, and which has no winding. The second teeth are disposed to oppose the end surfaces of the respective first teeth, and each second tooth is reciprocally movable between a reference position at which the second tooth directly opposes the respective first tooth and a maximum movable position located at the right center position between the respective end surfaces.
    Type: Application
    Filed: December 9, 2005
    Publication date: July 13, 2006
    Inventors: Haruyoshi Hino, Keiko Murota
  • Publication number: 20060103263
    Abstract: The present invention restrains generation of an eddy current caused by leaked magnetic flux, and reduces iron loss due to the eddy current. A tooth 61 is mounted to a stator yoke 60 in a state in which at least part of it (a portion 81 to be inserted into the yoke) is inserted into an insertion hole 75 formed through the magnet-opposed surface of the stator yoke 60, and the cross-sectional area S1 (See FIG. 6A) of the portion 81 of the tooth 61 to be inserted into the yoke, which is taken perpendicularly with respect to lines of magnetic force B1 generated at the tooth 61 when a coil 62 is energized, is larger than the cross-sectional area S2 (See FIG. 6B) of the portion 82 to be disposed within the coil of the tooth 61, which is taken perpendicularly with respect to the lines of the magnetic force B1.
    Type: Application
    Filed: August 15, 2003
    Publication date: May 18, 2006
    Inventors: Shinya Naito, Haruyoshi Hino, Hiroyuki Ishihara, Keiko Murota, Junji Terada