Patents by Inventor Kouki OIKAWA

Kouki OIKAWA 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: 11048236
    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: Grant
    Filed: October 30, 2019
    Date of Patent: June 29, 2021
    Assignee: FANUC CORPORATION
    Inventors: Kouki Oikawa, Yuuki Morita, Tadashi Okita
  • Patent number: 11003170
    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: Grant
    Filed: April 10, 2019
    Date of Patent: May 11, 2021
    Assignee: FANUC CORPORATION
    Inventors: Kouki Oikawa, Yuuki Morita, Tadashi Okita
  • Patent number: 10928452
    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 8, 2019
    Date of Patent: February 23, 2021
    Assignee: FANUC CORPORATION
    Inventors: Kouki Oikawa, Yuuki Morita, Tadashi Okita
  • Patent number: 10802474
    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: Grant
    Filed: February 7, 2019
    Date of Patent: October 13, 2020
    Assignee: FANUC CORPORATION
    Inventors: Kouki Oikawa, Yuuki Morita, Tadashi Okita
  • Publication number: 20200272122
    Abstract: A chatter vibration determination device is provided with a machine learning device configured to observe machining condition data including a feed speed and a spindle rotational frequency in cutting as state data representative of the current state of environment, execute processing related to machine learning using a learning model obtained by modeling the relationship of chatter vibration with a machining condition for the cutting, based on the state data, and estimate the occurrence/non-occurrence of chatter vibration and the improvement of the chatter vibration. The chatter vibration determination device outputs the result of the estimation of the occurrence/non-occurrence of the chatter vibration and the improvement of the chatter vibration.
    Type: Application
    Filed: February 25, 2020
    Publication date: August 27, 2020
    Applicant: Fanuc Corporation
    Inventors: Kouki Oikawa, Kenta Yamamoto
  • 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
  • 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
  • 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: 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
  • 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: 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
  • 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: 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: 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
  • Patent number: 10248102
    Abstract: A numerical controller for controlling a machine tool including a spindle motor formed of an induction motor includes: a storage unit that stores a maximum acceleration at which the spindle motor can operate when a magnetic flux amount of the spindle motor reaches its maximum; a magnetic flux amount acquisition unit that acquires a present magnetic flux amount of the spindle motor; and an acceleration change unit that changes an acceleration of a position command based on a maximum acceleration of the spindle motor stored in the storage unit according to a magnetic flux amount at the start of movement of the spindle motor acquired by the magnetic flux amount acquisition unit when the spindle motor is operated by position control using a position command.
    Type: Grant
    Filed: February 13, 2018
    Date of Patent: April 2, 2019
    Assignee: FANUC CORPORATION
    Inventors: Kouki Oikawa, Yuuki Morita, Tadashi Okita
  • Publication number: 20190097567
    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: Application
    Filed: September 6, 2018
    Publication date: March 28, 2019
    Applicant: FANUC CORPORATION
    Inventors: Kouki OIKAWA, Yuuki MORITA, Tadashi OKITA
  • Publication number: 20180259930
    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: Application
    Filed: March 7, 2018
    Publication date: September 13, 2018
    Applicant: FANUC CORPORATION
    Inventors: Kouki OIKAWA, Yuuki MORITA, Tadashi OKITA
  • Publication number: 20180239328
    Abstract: A numerical controller for controlling a machine tool including a spindle motor formed of an induction motor includes: a storage unit that stores a maximum acceleration at which the spindle motor can operate when a magnetic flux amount of the spindle motor reaches its maximum; a magnetic flux amount acquisition unit that acquires a present magnetic flux amount of the spindle motor; and an acceleration change unit that changes an acceleration of a position command based on a maximum acceleration of the spindle motor stored in the storage unit according to a magnetic flux amount at the start of movement of the spindle motor acquired by the magnetic flux amount acquisition unit when the spindle motor is operated by position control using a position command.
    Type: Application
    Filed: February 13, 2018
    Publication date: August 23, 2018
    Inventors: Kouki OIKAWA, Yuuki MORITA, Tadashi OKITA