Patents by Inventor Yuuki Morita

Yuuki Morita 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: 11056992
    Abstract: A motor controller includes: a rotation speed estimating unit that estimates a rotation speed of a motor based on current information and primary frequency information of the motor; a proximity switch that outputs an ON signal when a portion of a rotating body of the motor is in proximity and that outputs an OFF signal when a portion of the rotating body of the motor is not in proximity; a rotation speed calculating unit that calculates a rotation speed of the motor based on the ON signal and the OFF signal output from the proximity switch; a speed command compensating unit that compensates a speed command value such that an error between the speed command value and a rotation speed calculation value becomes smaller; and a speed control system that perform the speed control on the motor based on the compensated speed command value and the rotation speed estimation value.
    Type: Grant
    Filed: June 7, 2019
    Date of Patent: July 6, 2021
    Assignee: FANUC CORPORATION
    Inventors: Shoutarou Hashimoto, Yuuki Morita
  • 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: 11029651
    Abstract: A machine learning device includes: a state information acquisition unit configured to cause the control device to execute a tapping program to acquire from the control device, state information including a torque command value with respect to the spindle motor, a drive state including deceleration, a ratio of a movement distance in acceleration and a movement distance in deceleration; an action information output unit configured to output action information including adjustment information of the ratio of the movement distance in acceleration and the movement distance in deceleration, to the control device; a reward output unit configured to output a reward value in reinforcement learning based on a torque command value in deceleration, and a target torque command value in deceleration; and a value function update unit configured to update an action value function based on the reward value, the state information, and the action information.
    Type: Grant
    Filed: August 13, 2018
    Date of Patent: June 8, 2021
    Assignee: FANUC CORPORATION
    Inventors: Daisuke Tajima, Yuuki Morita
  • Publication number: 20210159824
    Abstract: A pole direction detection device for detecting a pole direction of a synchronous motor having saliency comprises a high-frequency voltage application unit that applies a high-frequency voltage to the motor; an excitation phase change unit that changes an excitation phase of the motor to an arbitrary phase; a driving current detection unit that detects a driving current value of the motor; a pole direction estimation unit that detects a pole direction based on the excitation phase and the driving current value; a measurement unit that measures an inductance value of the motor; and a control unit that changes a frequency of the high-frequency voltage to be applied by the high-frequency voltage application unit based on the inductance value measured by the measurement unit.
    Type: Application
    Filed: November 4, 2020
    Publication date: May 27, 2021
    Applicant: FANUC CORPORATION
    Inventors: Takashi OKAMOTO, Yuuki MORITA
  • 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
  • Publication number: 20210126565
    Abstract: The present disclosure provides a motor controller which can effectively stop a motor at a specific position in a short period of time, and can achieve an orientation operation more quickly.
    Type: Application
    Filed: September 30, 2020
    Publication date: April 29, 2021
    Applicant: FANUC CORPORATION
    Inventors: Daisuke TAJIMA, Yuuki MORITA
  • Patent number: 10955813
    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: Grant
    Filed: February 19, 2019
    Date of Patent: March 23, 2021
    Assignee: Fanuc Corporation
    Inventors: Daisuke Tajima, Yuuki Morita, Tadashi Okita
  • Patent number: 10935959
    Abstract: A motor control device is equipped with a command receiving unit adapted to receive a movement command and a first control period of the movement command from a numerical controller, a command generating unit which, on the basis of the first control period and a second control period which is determined in advance, is adapted to generate a movement command of the second control period from the movement command of the first control period, and a motor control unit adapted to control a motor, in accordance with the movement command generated by the command generating unit.
    Type: Grant
    Filed: November 5, 2018
    Date of Patent: March 2, 2021
    Assignee: FANUC CORPORATION
    Inventors: Tomohisa Tsutsumi, Yuuki Morita
  • 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
  • Publication number: 20210041848
    Abstract: To provide a servo motor controller that can quickly and effectively stop an industrial machine at a particular position even if operation speed is relatively low when a fixed position stop command is issued. The servo motor includes a speed comparison unit configured to compare speed at a time of a fixed position stop command with a first speed, a fixed position stop operation determination unit configured to determine an operation method at the time of the fixed position stop command, and a fixed position stop control unit configured to control the servo motor based on the determined operation method. When speed at the time of the fixed position.
    Type: Application
    Filed: August 3, 2020
    Publication date: February 11, 2021
    Applicant: FANUC CORPORATION
    Inventors: Daisuke TAJIMA, Yuuki MORITA
  • Publication number: 20210011498
    Abstract: A servo motor controller capable of eliminating inconvenience that the position of a shaft or the like of a servo motor is detected or set erroneously due to influence of noise or the like is provided. A servo motor controller that detects Z-phase signals of an incremental-type encoder that detects rotation of a servo motor to perform driving control of the servo motor includes: a position detection unit that detects a reference position of a rotating shaft of the servo motor on the basis of the Z-phase signal of the encoder; a signal interval detection unit that measures intervals of a plurality of detected Z-phase signals; and an abnormality determination unit that determines that the Z-phase signal is abnormal when the interval measured by the signal interval detection unit is equal to or larger than a prescribed threshold.
    Type: Application
    Filed: July 9, 2020
    Publication date: January 14, 2021
    Applicant: FANUC CORPORATION
    Inventors: Daisuke TAJIMA, Yuuki MORITA, Tadashi OKITA
  • Publication number: 20200382034
    Abstract: A motor control device according to an aspect of the present disclosure controls a motor by switching between speed control and position control, and sets a maximum voltage applied to the motor during the position control to lower than a maximum voltage applied to the motor during the speed control.
    Type: Application
    Filed: April 28, 2020
    Publication date: December 3, 2020
    Applicant: FANUC CORPORATION
    Inventors: Daisuke TAJIMA, 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: 20200316743
    Abstract: A control apparatus of a machine tool including a feed axis, which is driven by a feed axis motor, includes a load torque estimation unit configured to estimate a load torque acting on a spindle motor, based on a torque command to the spindle motor which drives a spindle axis of the machine tool, and a speed of the spindle motor; and a speed control unit configured to control a speed of a feed axis motor such that the load torque estimated by the load torque estimation unit follows a prescribed load torque target value.
    Type: Application
    Filed: April 6, 2020
    Publication date: October 8, 2020
    Inventors: Takashi OKAMOTO, Yuuki MORITA
  • Patent number: 10720869
    Abstract: A motor control device controls an induction motor driving a spindle of a machine tool, and includes: a spindle control unit that controls a rotational position or rotational speed of the spindle, and a secondary magnetic flux of the induction motor in accordance with an operation command based on an operation program of the machine tool; an advance detection unit that pre-reads the operation program, and detects a change in the operation command requiring to increase the secondary magnetic flux of the induction motor in advance; and an advance change unit that causes the secondary magnetic flux of the induction motor to increase prior to a change in the operation command in the spindle control unit, in a case of a change in the operation command being detected by the advance detection unit.
    Type: Grant
    Filed: October 5, 2018
    Date of Patent: July 21, 2020
    Assignee: FANUC CORPORATION
    Inventors: Shoutarou Hashimoto, Yuuki Morita
  • 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: 10666172
    Abstract: A motor control device includes: a polarity sensor configured to detect whether a magnetic pole position in a synchronous motor resides on a positive polarity side or a negative polarity side with reference to a reference position; a motor control unit configured to turn the synchronous motor from the polarity side detected by the polarity sensor toward an opposite polarity side through the reference position; and a magnetic pole position determination unit configured to determine, as the magnetic pole position, a position of the synchronous motor at the moment when the polarity changes, based on a detection result of the polarity sensor.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: May 26, 2020
    Assignee: FANUC CORPORATION
    Inventors: Tomohisa Tsutsumi, Yuuki Morita
  • 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