Patents by Inventor Tadashi Okita

Tadashi Okita 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: 20200249635
    Abstract: Information is collected from a management target device having a drive unit such as a machine tool, and this collected information is more practically used. An information collection device includes a collection unit that collects, from management target devices having a drive unit, operating state information which is information indicating an operating state of the management target device while operating accompanying movement of the drive unit; and a comparison unit that extracts a plurality of sets of information matching in a predetermined condition from the operating state information thus collected, and outputs a comparison result of the plurality of sets of information thus extracted.
    Type: Application
    Filed: April 21, 2020
    Publication date: August 6, 2020
    Inventor: Tadashi OKITA
  • Publication number: 20200201288
    Abstract: The determination of a slip constant is simplified upon driving a motor for which the slip constant is unknown, based on variation of acceleration when accelerating an induction motor from start up to a predetermined speed. A parameter determination support device for motor driving includes: an automatic measurement part which automatically measures characteristic information including a speed during acceleration and acceleration upon driving an induction motor to accelerate from start up to a predetermined speed set in advance which is no more than a base speed of the induction motor, relative to each slip constant, based on a plurality of slip constants set in advance; and an estimation part which estimates, as a slip constant of the induction motor, a slip constant having the smallest variation in acceleration, among a plurality of slip constants, based on the characteristic information.
    Type: Application
    Filed: October 30, 2019
    Publication date: June 25, 2020
    Inventors: Kouki OIKAWA, Yuuki MORITA, Tadashi OKITA
  • Publication number: 20200201289
    Abstract: The determination of a slip constant is simplified upon driving a motor for which the slip constant is unknown, based on the acceleration time when accelerating an induction motor from start up to a predetermined rotation number. A parameter determination support device for motor driving includes: an automatic measurement part which automatically measures characteristic information including the acceleration time upon driving an induction motor to accelerate from start up to a predetermined rotation number set in advance, relative to each slip constant, based on a plurality of slip constants set in advance; and an estimation part which estimates, as the slip constant of the induction motor, a slip constant at which the acceleration time up to a predetermined rotation number becomes the shortest, among a plurality of slip constants, based on the characteristic information.
    Type: Application
    Filed: November 15, 2019
    Publication date: June 25, 2020
    Inventors: Kouki OIKAWA, Yuuki MORITA, Tadashi OKITA
  • Patent number: 10678222
    Abstract: To reliably collect measured data without requiring a large-capacity storage device. A data collection device which is connected with a plurality of machine tools via a network includes: a priority calculation means for calculating a degree of relative priority for each of the plurality of machines tools, based on information related to a state of each of the machine tools; and a measured data collection means for deciding, in a case of receiving a collection request of measured data for the machine tool, which machine tool among the machine tools corresponding to the collection request to set as a collection target of the measured data based on the degree of relative priority, and for collecting the measured data from the machine tool decided as the collection target via the network.
    Type: Grant
    Filed: January 31, 2018
    Date of Patent: June 9, 2020
    Assignee: FANUC CORPORATION
    Inventors: Keitarou Inagaki, Junichi Tezuka, Tadashi Okita
  • Patent number: 10663943
    Abstract: To simplify determination of drive parameters upon driving a motor for which circuit constants are unknown, and shorten the time required in determination.
    Type: Grant
    Filed: February 6, 2019
    Date of Patent: May 26, 2020
    Assignee: FANUC CORPORATION
    Inventors: Kouki Oikawa, Yuuki Morita, Tadashi Okita
  • Patent number: 10656620
    Abstract: A motor control device is a motor control device which controls a spindle motor in a machine tool, and includes: a moving average filter which moving averages a torque command value or drive current value of the spindle motor for averaging time and generates averaged load information of the spindle motor; and an averaging time calculation unit which calculates, as the averaging time of the moving average filter, a first time of an integral multiple of a period of one rotation of the spindle driven by the spindle motor, or a second time of an integral multiple of a value arrived at by dividing the period of one rotation of the spindle by the number of cutting tooth of the tool.
    Type: Grant
    Filed: March 8, 2019
    Date of Patent: May 19, 2020
    Assignee: FANUC CORPORATION
    Inventors: Yuuki Morita, Tadashi Okita
  • Patent number: 10615734
    Abstract: To determine a driving parameter for driving a motor having an unknown circuit constant in a simple way and to shorten time required for the determination.
    Type: Grant
    Filed: September 6, 2018
    Date of Patent: April 7, 2020
    Assignee: FANUC CORPORATION
    Inventors: Kouki Oikawa, Yuuki Morita, Tadashi Okita
  • Patent number: 10571886
    Abstract: A machine tool control device according to the present invention includes a feedback counter for obtaining A- and B-phase signals of rectangular waves or sine waves and a one-rotation signal, which are outputted from a sensor for detecting the position or speed of a driven axis or a motor, to calculate a feedback count value that is a count value of the number of feedback pulses generated from the A- and B-phase signals; a feedback count value storage unit for storing an inter-one-rotation-signal feedback count value that is the feedback count value counted between the two sequential one-rotation signals; a reference value storage unit for storing an anomaly determination reference value corresponding to the inter-one-rotation-signal feedback count value; and an anomaly cause determination unit for determining the cause of an anomaly by comparison between the inter-one-rotation-signal feedback count value and the anomaly determination reference value.
    Type: Grant
    Filed: April 25, 2017
    Date of Patent: February 25, 2020
    Assignee: FANUC CORPORATION
    Inventors: Tadashi Okita, Yuuki Morita, Geng Li
  • Patent number: 10551817
    Abstract: A controller controlling a synchronized operation of spindle and feed axes. The controller is configured to make a spindle axis perform an accelerated rotation at maximum capacity from a starting position aiming at a maximum rotation speed; detect a maximum acceleration of the spindle axis; detect a residual rotation amount of the spindle axis; detect a current speed of the spindle axis; and execute a position control for making the spindle axis perform a decelerated rotation so as to reach a target position, after the accelerated rotation at maximum capacity. The controller is further configured to make the spindle axis perform the decelerated rotation at a positioning deceleration higher than a deceleration corresponding to the maximum acceleration and equal to or lower than a maximum deceleration capable of compensating for a mechanical loss in a drive source during the decelerated rotation of the spindle axis.
    Type: Grant
    Filed: January 24, 2018
    Date of Patent: February 4, 2020
    Assignee: FANUC CORPORATION
    Inventors: Tadashi Okita, Yuuki Morita, Daisuke Tajima
  • Patent number: 10539931
    Abstract: To provide a time-series data analysis device which allows to compare time-series data easily.
    Type: Grant
    Filed: March 11, 2019
    Date of Patent: January 21, 2020
    Assignee: FANUC CORPORATION
    Inventors: Wei Luo, Junichi Tezuka, Tadashi Okita
  • Patent number: 10527676
    Abstract: An abnormality diagnosing device diagnoses a driving abnormality of a single motor driven by a plurality of motor driving devices. The motor driving devices drive the motor by supplying three-phase alternating currents to a plurality of three-phase windings possessed by the motor. The abnormality diagnosing device is equipped with a rotational speed acquisition unit for acquiring a rotational speed value of the motor, a current acquisition unit for acquiring phase current values of respective phases flowing through the three-phase windings, and a determination unit for determining the presence of an abnormality, if an absolute value of the rotational speed value exceeds a predetermined value, and an absolute value of the phase current value of any one phase of the three-phase windings is less than a threshold value continuously for a predetermined time period.
    Type: Grant
    Filed: May 1, 2018
    Date of Patent: January 7, 2020
    Assignee: FANUC CORPORATION
    Inventors: Yuuki Morita, Tadashi Okita, Kenji Takahashi
  • Patent number: 10488465
    Abstract: An abnormality diagnosing device diagnoses a driving abnormality of a single motor driven by a plurality of motor driving devices. The motor driving devices drive the motor by supplying three-phase alternating currents to a plurality of three-phase windings possessed by the motor. The abnormality diagnosing device is equipped with a rotational speed acquisition unit for acquiring a rotational speed value of the motor, a current acquisition unit for acquiring phase current values of respective phases flowing through the three-phase windings, and a determination unit for determining the presence of an abnormality, if an absolute value of the rotational speed value exceeds a predetermined value, and an absolute value of the phase current value of any one phase of the three-phase windings is less than a threshold value continuously for a predetermined time period.
    Type: Grant
    Filed: May 1, 2018
    Date of Patent: November 26, 2019
    Assignee: FANUC CORPORATION
    Inventors: Yuuki Morita, Tadashi Okita, Kenji Takahashi
  • Publication number: 20190317479
    Abstract: To provide a parameter determination support device and a program capable of simplifying determination of driving parameters upon driving a motor for which the slip constant is unknown.
    Type: Application
    Filed: April 10, 2019
    Publication date: October 17, 2019
    Applicant: FANUC CORPORATION
    Inventors: Kouki OIKAWA, Yuuki MORITA, Tadashi OKITA
  • Patent number: 10444288
    Abstract: An abnormality diagnosing device diagnoses a driving abnormality of a single motor driven by a plurality of motor driving devices. The plurality of motor driving devices calculate a plurality of voltage command values based on a speed command, and voltages are applied to a plurality of windings possessed by the motor based on the plurality of calculated voltage command values, thereby driving the motor. The abnormality diagnosing device is equipped with a command value difference calculating unit for calculating a difference between the plurality of voltage command values calculated by the plurality of motor driving devices, and a determination unit for determining the presence of an abnormality, when an absolute value of the difference calculated exceeds a first threshold value continuously for a predetermined time period.
    Type: Grant
    Filed: May 1, 2018
    Date of Patent: October 15, 2019
    Assignee: FANUC CORPORATION
    Inventors: Yuuki Morita, Kenji Takahashi, Tadashi Okita
  • Patent number: 10444727
    Abstract: An object is to provide the numerical control device of a machine tool which can achieve both a reduction in heat generation and stability in heavy cutting. A numerical control device includes a command transmission portion which transmits a speed command value and a magnetic flux command value to the spindle control portion of a machine tool and a storage portion which stores magnetic flux amounts corresponding to tools that may be used in the machine tool. The numerical control device also includes a tool detection portion which detects a tool selected in the machine tool and a magnetic flux amount setting portion which commands the command transmission portion to read, from the storage portion, a magnetic flux amount corresponding to the tool detected by the tool detection portion and to output the magnetic flux amount to the spindle control portion of the machine tool.
    Type: Grant
    Filed: March 7, 2018
    Date of Patent: October 15, 2019
    Assignee: FANUC CORPORATION
    Inventors: Kouki Oikawa, Yuuki Morita, Tadashi Okita
  • Patent number: 10444729
    Abstract: To provide a monitoring device, a machine tool, and a monitoring system capable of collecting data efficiently required for examining an alarm. A monitoring device is connected to multiple machine tools through a network. The monitoring device comprises: a monitoring unit that monitors the occurrence of an alarm in the machine tools; an acquisition unit that acquires a set of measurement target data items responsive to an alarm from a database on the occurrence of the alarm; and a collection unit that sets the set of measurement target data items in the multiple machine tools, and collects data measured by following the setting.
    Type: Grant
    Filed: February 2, 2018
    Date of Patent: October 15, 2019
    Assignee: FANUC CORPORATION
    Inventors: Kazuyuki Sugiyama, Junichi Tezuka, Tadashi Okita
  • Publication number: 20190310613
    Abstract: To provide an observation apparatus, an observation method, and an observation program capable of presenting a point of interest for finding a wasteful waiting time of a machine. The observation apparatus includes an observation data acquisition unit configured to acquire observation data on an operation status of a machine along with time information, an extraction unit configured to extract, on the basis of a first condition relating to the observation data, a time range of the observation data corresponding to an operation of the machine, the operation having a possibility of generating a waiting time, and an output unit configured to output information on the extracted time range.
    Type: Application
    Filed: March 18, 2019
    Publication date: October 10, 2019
    Inventors: Wei LUO, Junichi TEZUKA, Tadashi OKITA
  • Publication number: 20190302727
    Abstract: A motor control device is a motor control device which controls a spindle motor of a machine tool, the device including: a low-pass filter which averages torque command values or drive current values of the spindle motor and calculates averaged load information of the spindle motor; and a time constant calculation unit which calculates, as a time constant of the low-pass filter, a first time constant based on a cut-off frequency according to the rotation number of the spindle driven by the spindle motor, or a second time constant based on a cut-off frequency according to a value produced by multiplying a of cutting tooth number of a tool by the rotation number of the spindle.
    Type: Application
    Filed: February 19, 2019
    Publication date: October 3, 2019
    Inventors: Yuuki MORITA, Tadashi OKITA
  • Publication number: 20190302728
    Abstract: A motor control device is a motor control device which controls a spindle motor in a machine tool, and includes: a moving average filter which moving averages a torque command value or drive current value of the spindle motor for averaging time and generates averaged load information of the spindle motor; and an averaging time calculation unit which calculates, as the averaging time of the moving average filter, a first time of an integral multiple of a period of one rotation of the spindle driven by the spindle motor, or a second time of an integral multiple of a value arrived at by dividing the period of one rotation of the spindle by the number of cutting tooth of the tool.
    Type: Application
    Filed: March 8, 2019
    Publication date: October 3, 2019
    Inventors: Yuuki MORITA, Tadashi OKITA
  • Patent number: 10423170
    Abstract: Included are a first position detection part that detects a first position which is the position of a movable part; a second position detection part that detects a second position which is the position of a driven part; a positional error calculation part that calculates positional error, which is deviation between a converted first position detection value and a second position detection value; and a positional error variation calculation part that calculates an absolute value for variation of positional error since reversal of a position command was detected, in which addition of a backlash correction amount is started if the absolute value for the variation of the positional error exceeds a first reference value, and addition of a backlash acceleration amount is started if the absolute value of variation of the positional error exceeds a second reference value.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: September 24, 2019
    Assignee: Fanuc Corporation
    Inventors: Shoutarou Hashimoto, Tadashi Okita, Yuuki Morita