Patents by Inventor Yuuki SHIRAKAWA

Yuuki SHIRAKAWA 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: 11190119
    Abstract: A control device includes: an output unit configured to select a motor and output a drive command to a motor drive unit that should be connected to the selected motor so that the selected motor executes a predetermined feed operation; an acquisition unit configured to acquire feedback information from each of the multiple motor drive units; and a wire connection determination unit configured to determine, based on the feedback information, whether the selected motor is connected to the motor drive unit that should be connected to the selected motor, by a power line and a feedback line.
    Type: Grant
    Filed: May 22, 2020
    Date of Patent: November 30, 2021
    Assignee: FANUC CORPORATION
    Inventors: Yuuki Shirakawa, Satoshi Ikai, Wei Luo
  • Publication number: 20210003989
    Abstract: To provide a servo motor controller allowing to eliminate the risk of abnormal driving in a servo motor caused due to the inability to detect abnormality prior to establishment of absolute position. A device is configured to control a servo motor of an industrial machine. The device includes a position detection part configured to detect a position of the servo motor, a magnetic pole detection part configured to detect a magnetic pole position of the servo motor, and a pole position calculation part configured to, at least in initial calculation, obtain the magnetic pole position detected by the magnetic pole detection part as an initial magnetic pole position, prior to establishment of absolute position, and in the following calculation, incrementally obtain the magnetic pole position on the basis of data of the position detected by the position detection part and a magnetic pole interval of the motor.
    Type: Application
    Filed: July 2, 2020
    Publication date: January 7, 2021
    Applicant: FANUC CORPORATION
    Inventors: Takaki SHIMODA, Satoshi IKAI, Yuuki SHIRAKAWA
  • Publication number: 20200382027
    Abstract: A control device includes: an output unit configured to select a motor and output a drive command to a motor drive unit that should be connected to the selected motor so that the selected motor executes a predetermined feed operation; an acquisition unit configured to acquire feedback information from each of the multiple motor drive units; and a wire connection determination unit configured to determine, based on the feedback information, whether the selected motor is connected to the motor drive unit that should be connected to the selected motor, by a power line and a feedback line.
    Type: Application
    Filed: May 22, 2020
    Publication date: December 3, 2020
    Inventors: Yuuki SHIRAKAWA, Satoshi IKAI, Wei LUO
  • Patent number: 10684594
    Abstract: A machine learning device performs machine learning with respect to a servo motor controller that converts a three-phase current to a two-phase current of the d- and q-phase. The machine learning device includes: a state information acquisition unit configured to acquire, from the servo motor controller, state information including velocity or a velocity command, reactive current, and an effective current command and effective current or a voltage command; an action information output unit configured to output action information including a reactive current command to the servo motor controller; a reward output unit configured to output a value of a reward of reinforcement learning based on the voltage command or the effective current command and the effective current; and a value function updating unit configured to update a value function on the basis of the output value of the reward, the state information, and the action information.
    Type: Grant
    Filed: February 6, 2019
    Date of Patent: June 16, 2020
    Assignee: FANUC CORPORATION
    Inventors: Yuuki Shirakawa, Satoshi Ikai
  • Publication number: 20200104743
    Abstract: Setting of parameters that determine filter characteristics is facilitated. A machine learning device performs machine learning of optimizing coefficients of at least one filter provided in a servo control device that controls rotation of a motor. The filter is a filter for attenuating a specific frequency component. The coefficients of the filter are optimized on the basis of measurement information of a measurement device that measures at least one of an input/output gain and an input/output phase delay of the servo control device on the basis of an input signal of which the frequency changes and an output signal of the servo control device.
    Type: Application
    Filed: August 26, 2019
    Publication date: April 2, 2020
    Inventors: Ryoutarou TSUNEKI, Satoshi IKAI, Yuuki SHIRAKAWA
  • Publication number: 20190243318
    Abstract: A machine learning device performs machine learning with respect to a servo motor controller that converts a three-phase current to a two-phase current of the d- and q-phase. The machine learning device includes: a state information acquisition unit configured to acquire, from the servo motor controller, state information including velocity or a velocity command, reactive current, and an effective current command and effective current or a voltage command; an action information output unit configured to output action information including a reactive current command to the servo motor controller; a reward output unit configured to output a value of a reward of reinforcement learning based on the voltage command or the effective current command and the effective current; and a value function updating unit configured to update a value function on the basis of the output value of the reward, the state information, and the action information.
    Type: Application
    Filed: February 6, 2019
    Publication date: August 8, 2019
    Inventors: Yuuki SHIRAKAWA, Satoshi IKAI