Patents by Inventor Koji Uemura

Koji Uemura 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: 20220134553
    Abstract: A robot system includes: a robot comprising a joint driven by a motor; and a circuitry configured to: execute position control of the motor based on position commands; store torque commands generated based on the position commands during execution of the position control of the motor; and execute torque control of the motor based on the stored torque commands.
    Type: Application
    Filed: January 13, 2022
    Publication date: May 5, 2022
    Inventors: Keita SHIMAMOTO, Koji UEMURA
  • Publication number: 20210359625
    Abstract: A motor control system includes a motor, an encoder, and a controller including a controller transmitter configured to transmit a torque command to control the motor. The encoder includes a position detector configured to detect a rotational position of the motor, an encoder receiver configured to receive the torque command from the controller transmitter, first disturbance estimating circuitry configured to estimate a first disturbance torque based on the rotational position and the torque command, and an encoder transmitter configured to transmit the rotational position and the first disturbance torque to the controller.
    Type: Application
    Filed: July 28, 2021
    Publication date: November 18, 2021
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Keita SHIMAMOTO, Koji UEMURA
  • Publication number: 20170266814
    Abstract: A robot includes a rotation axis and a torque sensor. The torque sensor is disposed on the rotation axis, and includes a strain generating body and a strain sensor. The strain sensor is mounted on a portion of the strain generating body. The strain generating body includes an inner flange, a ring-shaped outer flange, and a plurality of spokes. The outer flange is disposed further outward than the inner flange in a radial direction of the inner flange. The plurality of spokes are disposed between the inner flange and the outer flange and connect the inner flange and the outer flange to each other. At least one spoke of the plurality of spokes is a separate spoke which is un-integral to the inner flange and the outer flange and on which the strain sensor is mounted.
    Type: Application
    Filed: March 2, 2017
    Publication date: September 21, 2017
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Koji UEMURA, Fei ZHAO, Takehito SOGA
  • Patent number: 9368189
    Abstract: A semiconductor device includes an output circuit having a plurality of unit buffer circuits, an impedance of each unit buffer circuit of the plurality of unit buffer circuits being adjustable, a control circuit configured to selectively activate one or more unit buffer circuits of the plurality of unit buffer circuits, and an impedance adjustment unit configured to adjust the impedance of each of the unit buffer circuits of the plurality of unit buffer circuits. The impedance adjustment unit includes a first power line, a replica circuit, and a load current generation circuit. The replica circuit and the load current generation circuit are coupled in common to the first power line, the replica circuit has a replica impedance that is substantially equal to the impedance of the output circuit, and the load current generation circuit changes current flowing therethrough.
    Type: Grant
    Filed: June 3, 2014
    Date of Patent: June 14, 2016
    Assignee: PS4 LUXCO S.A.R.L.
    Inventors: Hideyuki Yokou, Koji Uemura, Manabu Ishimatsu
  • Publication number: 20160161295
    Abstract: An encoder includes an object body having an absolute pattern formed along a measurement direction, a light source positioned such that the light source emits light to the absolute pattern of the object body, and light receiving elements aligned along the measurement direction such that the light receiving elements receive the light transmitted through or reflected by the absolute pattern of the object body. The light receiving elements include a first light receiving element having a polygonal shape and having a first region in the polygonal shape and a second region formed on an inner side of the first region such that the second region has an optical sensitivity lower than an optical sensitivity of the first region and that the first region includes corner portions of the polygonal shape.
    Type: Application
    Filed: December 7, 2015
    Publication date: June 9, 2016
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Koji UEMURA, Yuji ARINAGA, Shiro YOSHIDOMI, lkuma MUROKITA, Hiroshi TAKADA, Jiro MURAOKA
  • Publication number: 20160164383
    Abstract: An encoder includes an absolute pattern, a light source, and a plurality of light reception elements. The absolute pattern is disposed in a measurement direction. The light source is configured to emit light to the absolute pattern. The plurality of light reception elements are arranged in the measurement direction and configured to receive the light emitted from the light source and transmitted through or reflected by the absolute pattern. The plurality of light reception elements include at least one first light reception element having an edge in the measurement direction. The edge is inclined relative to a width direction perpendicular to the measurement direction.
    Type: Application
    Filed: November 24, 2015
    Publication date: June 9, 2016
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Hiroshi TAKADA, Yuji ARINAGA, Shiro YOSHIDOMI, Ikuma MUROKITA, Koji UEMURA, Jiro MURAOKA
  • Patent number: 9151638
    Abstract: A rotating electric machine according to the embodiments includes a rotating-electric-machine unit, a rotation detector, an Oldham coupling, and a washer. The rotating-electric-machine unit includes a shaft. The rotation detector includes a body and a rotation input pin that is rotatably provided on the body. The Oldham coupling couples the rotation input pin of the rotation detector and the shaft to each other while allowing any relative displacement in a direction intersecting an axial direction. The washer is provided on the rotating-electric-machine unit while being positioned with respect to the shaft. The washer includes an attaching portion at which the body of the rotation detector is attached to the washer.
    Type: Grant
    Filed: March 29, 2013
    Date of Patent: October 6, 2015
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Ryuta Kagawa, Kenji Matsuura, Koji Uemura
  • Publication number: 20140286109
    Abstract: A semiconductor device includes an output circuit having a plurality of unit buffer circuits, an impedance of each unit buffer circuit of the plurality of unit buffer circuits being adjustable, a control circuit configured to selectively activate one or more unit buffer circuits of the plurality of unit buffer circuits, and an impedance adjustment unit configured to adjust the impedance of each of the unit buffer circuits of the plurality of unit buffer circuits. The impedance adjustment unit includes a first power line, a replica circuit, and a load current generation circuit. The replica circuit and the load current generation circuit are coupled in common to the first power line, the replica circuit has a replica impedance that is substantially equal to the impedance of the output circuit, and the load current generation circuit changes current flowing therethrough.
    Type: Application
    Filed: June 3, 2014
    Publication date: September 25, 2014
    Inventors: Hideyuki YOKOU, Koji UEMURA, Manabu ISHIMATSU
  • Patent number: 8766664
    Abstract: The semiconductor device comprises an output circuit that includes a plurality of unit buffer circuits each of which has an adjustable impedance, a control circuit that selectively activates one or ones of the unit buffer circuits, and an impedance adjustment unit that adjusts the impedances of the unit buffer circuits and includes a power line, a replica circuit, which has a replica impedance that is substantially equal to the adjustable impedance of each of the unit buffer circuits, and a load current generation circuit, which changes current flowing therethrough in accordance with the number of activated the one or ones of the unit buffer circuits. The replica circuit and the load current generation circuit are connected in common to the power line.
    Type: Grant
    Filed: October 10, 2012
    Date of Patent: July 1, 2014
    Inventors: Hideyuki Yokou, Koji Uemura, Manabu Ishimatsu
  • Publication number: 20130278249
    Abstract: A rotating electric machine according to the embodiments includes a rotating-electric-machine unit, a rotation detector, an Oldham coupling, and a washer. The rotating-electric-machine unit includes a shaft. The rotation detector includes a body and a rotation input pin that is rotatably provided on the body. The Oldham coupling couples the rotation input pin of the rotation detector and the shaft to each other while allowing any relative displacement in a direction intersecting an axial direction. The washer is provided on the rotating-electric-machine unit while being positioned with respect to the shaft. The washer includes an attaching portion at which the body of the rotation detector is attached to the washer.
    Type: Application
    Filed: March 29, 2013
    Publication date: October 24, 2013
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Ryuta KAGAWA, Kenji MATSUURA, Koji UEMURA
  • Patent number: 7635975
    Abstract: Magnetic field detection elements and detect a magnetic material member formed at a rotary disc. An A pulse generation portion and a B pulse generation portion generate an A pulse a and a B pulse b which phases differ by 90 degrees to each other. The B pulse generation portion is supplied with the power from a backup power supply for a predetermined time period necessary for detecting the level of the B pulse from a time point of the edge of the A pulse.
    Type: Grant
    Filed: May 11, 2005
    Date of Patent: December 22, 2009
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Koji Uemura, Shirou Yoshidomi, Takafumi Goto
  • Patent number: 7595635
    Abstract: A magnetic encoder unit with a small size and low power consumption is provided which can detect an angle in not more than one-turn and an amount of multi-turn. The magnetic encoder unit includes a permanent magnet 2 magnetized in a direction perpendicular to a rotation axis of a rotating member 1 and fixed to the rotating member 1, a magnetic field detecting element 4 fixed to a fixed member 3 so as to be opposite to the permanent magnet 2 with a gap therebetween, and a signal processing circuit 5 processing a signal from the magnetic field detecting element 4. Here, multi-turn detecting means including a multi-turn magnetic field detecting element 6 and a multi-turn signal processing circuit 7 detecting an amount of multi-turn from a signal of the multi-turn magnetic field detecting element 6 is added thereto.
    Type: Grant
    Filed: May 11, 2005
    Date of Patent: September 29, 2009
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Koji Uemura, Yuji Arinaga, Takefumi Kabashima
  • Publication number: 20080272834
    Abstract: To reduce the consumption current of the backup power supply of an absolute multi-revolution encoder thereby to elongate the life time of the backup power supply. Magnetic field detection elements (310) and (320) detect a magnetic material member (11) formed at a rotary disc (1). An A pulse generation portion (31) and a B pulse generation portion (32) generate an A pulse a and a B pulse b which phases differ by 90 degrees to each other. The B pulse generation portion (32) is supplied with the power from a backup power supply for a predetermined time period necessary for detecting the level of the B pulse from a time point of the edge of the A pulse.
    Type: Application
    Filed: May 11, 2005
    Publication date: November 6, 2008
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Koji Uemura, Shirou Yoshidomi, Takafumi Goto
  • Publication number: 20080054886
    Abstract: A magnetic encoder unit with a small size and low power consumption is provided which can detect an angle in not more than one-turn and an amount of multi-turn. The magnetic encoder unit includes a permanent magnet 2 magnetized in a direction perpendicular to a rotation axis of a rotating member 1 and fixed to the rotating member 1, a magnetic field detecting element 4 fixed to a fixed member 3 so as to be opposite to the permanent magnet 2 with a gap therebetween, and a signal processing circuit 5 processing a signal from the magnetic field detecting element 4. Here, multi-turn detecting means including a multi-turn magnetic field detecting element 6 and a multi-turn signal processing circuit 7 detecting an amount of multi-turn from a signal of the multi-turn magnetic field detecting element 6 is added thereto.
    Type: Application
    Filed: May 11, 2005
    Publication date: March 6, 2008
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Koji Uemura, Yuji Arinaga, Takefumi Kabashima
  • Patent number: 7042211
    Abstract: A multirotation type encoder of the invention includes a first encoder 20 attached to a rotating shaft 11 of a rotating machine 10 for detecting an absolute value rotational angle within one rotation, and a second encoder for counting a multirotation amount of the rotating shaft 11 by using a speed reducing mechanism 30 by magnetic coupling and the second encoder 40 is constituted by a first magnetic gear 31 directly connected to the rotating shaft and magnetized in multiple poles and at least one second magnetic gear 32 arranged to be opposed thereto in noncontact and magnetized in multiple poles by a number of magnetic poles larger than that of the first magnetic gear 31 and is constituted to count a multirotation amount by detecting a rotational angle of the second magnetic gear by the second encoder.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: May 9, 2006
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Takefumi Kabashima, Kazunari Matsuzaki, Koji Uemura, Takashi Nagase
  • Publication number: 20040246148
    Abstract: There is provided a multirotation type encoder which is small-sized, having nomechanical contact portion other than a bearing, having high reliability and long life and dispensing with interchange of a battery.
    Type: Application
    Filed: April 16, 2004
    Publication date: December 9, 2004
    Inventors: Takefumi Kabashima, Kazunari Matsuzaki, Koji Uemura, Takashi Nagase