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).

  • 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: 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
  • 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: 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
  • 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: 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
  • 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
  • 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
  • Publication number: 20190286070
    Abstract: To provide a time-series data analysis device which allows to compare time-series data easily.
    Type: Application
    Filed: March 11, 2019
    Publication date: September 19, 2019
    Inventors: Wei LUO, Junichi TEZUKA, Tadashi OKITA
  • Patent number: 10396699
    Abstract: An anomaly diagnosing device diagnoses an anomaly in a single motor driven by multiple motor drive units. The multiple motor drive units supply AC currents to multiple multi-phase windings of the motor to drive the motor. The anomaly diagnosing device includes: a power consumption calculator for calculating power consumption in each of the multi-phase windings; a power difference calculator for calculating a difference in power consumption between the multi-phase windings; and a determination unit for determining that an anomaly is occurring when the absolute value of the difference has exceeded a threshold for a predetermined period of time.
    Type: Grant
    Filed: June 18, 2018
    Date of Patent: August 27, 2019
    Assignee: FANUC CORPORATION
    Inventors: Yuuki Morita, Kenji Takahashi, Tadashi Okita
  • Publication number: 20190258216
    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: Application
    Filed: February 6, 2019
    Publication date: August 22, 2019
    Applicant: FANUC CORPORATION
    Inventors: Kouki OIKAWA, Yuuki MORITA, Tadashi OKITA
  • Publication number: 20190257883
    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: Application
    Filed: February 8, 2019
    Publication date: August 22, 2019
    Applicant: FANUC CORPORATION
    Inventors: Kouki OIKAWA, Yuuki MORITA, Tadashi OKITA
  • Publication number: 20190258217
    Abstract: A control apparatus of a machine tool, the control apparatus including: a numerical control unit configured to create a spindle axis command and a feed axis command according to a tapping program; a spindle axis control unit configured to control rotational operation of the spindle axis according to the spindle axis command; a rotation detector configured to detect a rotation position of the spindle axis; and a feed axis control unit configured to control feeding operation of the feed axis according to the feed axis command on the basis of the rotation position. The numerical control unit is further configured to include, in the spindle axis command, a speed command value during return that does not depend on maximum rotation speed during machining of the spindle axis and that is higher than the maximum rotation speed during machining, as a command of return operation.
    Type: Application
    Filed: February 19, 2019
    Publication date: August 22, 2019
    Applicant: Fanuc Corporation
    Inventors: Daisuke Tajima, Yuuki Morita, Tadashi Okita
  • Publication number: 20190258227
    Abstract: To simplify determination of drive parameters upon driving a motor for which circuit constants are unknown, and shorten the time required in determination. A parameter determination support device includes: an automatic measurement part which applies initial parameters, and automatically measures a revolution speed (rpm) of a synchronous motor, as well as a DC link voltage (V) and Q-phase voltage command (%) of a motor drive device, as operating information upon driving the synchronous motor at substantially constant speed based on a base speed, according to a test-run program; an estimation part which estimates a reverse voltage constant (V/krpm) and torque constant (Nm/Arms) as circuit constants of the synchronous motor based on the operating information; and a calculation part which performs calculation of optimum parameters tailored to the output specification of the synchronous motor based on the circuit constants.
    Type: Application
    Filed: February 7, 2019
    Publication date: August 22, 2019
    Applicant: FANUC CORPORATION
    Inventors: Kouki OIKAWA, Yuuki MORITA, Tadashi OKITA
  • Publication number: 20190243351
    Abstract: A failure location specifying device, a failure location specifying method, and a failure location specifying program capable of specifying locations of various failures occurring in a mechanism unit of a machine efficiently are provided. A failure location specifying device includes: a failure history database that stores a specific frequency band occurring resulting from a failure of a machine in correlation with at least an event code indicating a location of the failure; an input unit that receives data related to vibration during operation of the machine as an input; and an output unit that matches the specific frequency band to a frequency included in the data related to vibration to specify the location of the failure and outputs the event code.
    Type: Application
    Filed: December 27, 2018
    Publication date: August 8, 2019
    Inventors: Tadashi OKITA, Norinaga MUTAI, Masao KAMIGUCHI
  • Patent number: 10359761
    Abstract: A controller controlling a synchronized operation of spindle and feed axes. A positioning-motion control section of a spindle-axis control section calculates a first velocity command making a spindle axis perform a decelerated rotation at a variable deceleration lower than a maximum deceleration during an acceleration-varying time just after the spindle axis reaches an intermediate speed or just before the spindle axis reaches a target position, and making the spindle axis perform the decelerated rotation at the maximum deceleration during a time except for the acceleration-varying time; calculates a second velocity command making the spindle axis perform a decelerated rotation at a constant deceleration lower than the maximum deceleration after the spindle axis reaches the intermediate speed; and chooses either one, achieving a lower speed, of the first and second velocity command during a period when the spindle axis operates from the intermediate speed to reach the target position.
    Type: Grant
    Filed: November 15, 2017
    Date of Patent: July 23, 2019
    Assignee: FANUC CORPORATION
    Inventors: Daisuke Tajima, Yuuki Morita, Tadashi Okita
  • Publication number: 20190187666
    Abstract: A data collection device capable of reducing the load of a data collection process and network communication by monitoring trigger at a plurality of cycles is provided. The data collection device includes a control unit, and the control unit includes: an event monitoring unit that acquires first trigger information from the machine tool at a first cycle and monitors whether a starting condition and an ending condition for acquisition of the data have been established on the basis of the first trigger information; a sampling control unit that instructs the machine tool to sample the data at a second cycle shorter than the first cycle when the starting condition is established and instructs the machine tool to end the sampling when the ending condition is established; and a data acquisition unit that acquires the data sampled by the machine tool from the machine tool together with second trigger information.
    Type: Application
    Filed: November 21, 2018
    Publication date: June 20, 2019
    Inventors: Kazuyuki SUGIYAMA, Junichi TEZUKA, Tadashi OKITA