Patents by Inventor Kouki Kameta
Kouki Kameta 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).
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Patent number: 11754994Abstract: A diagnostic apparatus includes an acquiring unit that acquires state information indicating an operational state of a motor for driving a shaft of a machine tool; a sensor that measures a physical quantity indicating an environment of the machine tool; a storage unit which stores a normal range of the state information corresponding to a value of the physical quantity; and a judging unit that, when the state information acquired by the acquiring unit is not within the normal range of the state information corresponding to the value of the physical quantity measured by the sensor, judges that the machine tool has an abnormality.Type: GrantFiled: September 14, 2020Date of Patent: September 12, 2023Assignee: FANUC CORPORATIONInventor: Kouki Kameta
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Patent number: 10962952Abstract: A servo control apparatus for a machine that performs machining by causing a plurality of synchronizing axes to operate cooperatively in synchronized relationship with a reference axis, the servo control apparatus comprising: a position detection unit for detecting at least one of the position of the servo motor and the position of a driven body; a position error calculation unit for calculating an error between the position command and the position detected by the position detection unit; a reference axis position acquisition unit for acquiring the positions of a plurality of reference axes; a reference axis selection unit for selecting one reference axis based on a machining condition of the driven body from among the plurality of reference axes whose positions have been acquired; and a learning control unit for performing learning control using an angle synchronization method, based on the error and the position of the selected reference axis.Type: GrantFiled: March 22, 2016Date of Patent: March 30, 2021Assignee: FANUC CORPORATIONInventors: Kouki Kameta, Naoto Sonoda
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Publication number: 20210080923Abstract: A diagnostic apparatus includes an acquiring unit that acquires state information indicating an operational state of a motor for driving a shaft of a machine tool; a sensor that measures a physical quantity indicating an environment of the machine tool; a storage unit which stores a normal range of the state information corresponding to a value of the physical quantity; and a judging unit that, when the state information acquired by the acquiring unit is not within the normal range of the state information corresponding to the value of the physical quantity measured by the sensor, judges that the machine tool has an abnormality.Type: ApplicationFiled: September 14, 2020Publication date: March 18, 2021Inventor: Kouki Kameta
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Patent number: 10642250Abstract: A servo control system for controlling a plurality of axes of a machine tool, comprises: a plurality of servo control units for controlling the plurality of axes, respectively; a plurality of learning control units that are provided one each in the plurality of servo control units, and each configured to control a cyclic operation highly precisely; a common learning memory for storing correction data which at least a portion of the plurality of learning control units generates; a memory allocation unit for allocating at least a portion of a memory area in the learning memory to the axis that the learning control unit that generated the correction data controls; and a memory amount notifying unit for notifying the memory allocation unit as to the amount of memory that each of the plurality of learning control units of the respective axes requires.Type: GrantFiled: July 26, 2016Date of Patent: May 5, 2020Assignee: FANUC CORPORATIONInventors: Kouki Kameta, Naoto Sonoda
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Patent number: 9910421Abstract: A control device for a machine tool for cutting a rotationally-symmetric workpiece by a tool, includes a machining command making unit for making a machining command for an auxiliary motor based on rotation speeds of the workpiece and the tool, and feed rates of the tool and the workpiece, an oscillation command making unit for making an oscillation command for the auxiliary motor, based on the rotation speeds and the feed rates, so that the oscillation command is asynchronous with the rotation speed of the workpiece around the axis of rotation, and so that the tool intermittently cuts the workpiece, an addition unit for adding the oscillation command to the machining command, and a control unit for controlling the auxiliary motor based on the machining command to which the oscillation command has been added.Type: GrantFiled: September 15, 2016Date of Patent: March 6, 2018Assignee: FANUC CORPORATIONInventors: Kouki Kameta, Naoto Sonoda
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Patent number: 9905264Abstract: A servo control system according to the present invention includes a servo control device for driving a driven body that operates periodically using a servomotor; and a learning controller for generating correction data based on a location deviation with respect to a uniform command pattern, and storing the correction data in delay memory and correcting the location deviation. The delay memory includes first memory having a short access delay time and second memory having a long access delay time. The servo control device includes a switching unit for assigning one of the first memory and the second memory to the learning controller, depending on a learning period according to the command pattern.Type: GrantFiled: June 28, 2016Date of Patent: February 27, 2018Assignee: FANUC CORPORATIONInventors: Kouki Kameta, Naoto Sonoda
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Patent number: 9823647Abstract: A servo control apparatus includes a sensor unit for detecting a motor speed; an amplifier for driving a motor and feeding back a current; a magnetic pole position detector; a position controller for outputting a speed command; a speed controller for outputting a current command; a current controller for outputting a voltage command; a speed estimator for calculating an estimated speed from the voltage command; a magnetic pole position estimator for calculating an estimated magnetic pole position from the estimated speed; a sensor malfunction detector; a stop position command generator; and a first switch for switching from the position command to the stop position command, a second switch for switching from the magnetic pole position to the estimated magnetic pole position, and a third switch for switching from the detected speed to the estimated speed, when the sensor malfunction detector has detected a malfunction.Type: GrantFiled: April 10, 2017Date of Patent: November 21, 2017Assignee: FANUC CORPORATIONInventors: Kouki Kameta, Naoto Sonoda
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Patent number: 9751178Abstract: A servo control apparatus includes a sensor unit for detecting a motor speed; an amplifier for driving a motor and feeding back a current; a magnetic pole position detector; a position controller for outputting a speed command; a speed controller for outputting a current command; a current controller for outputting a voltage command; a speed estimator for calculating an estimated speed from the voltage command; a magnetic pole position estimator for calculating an estimated magnetic pole position from the estimated speed; a sensor malfunction detector; a stop position command generator; and a first switch for switching from the position command to the stop position command, a second switch for switching from the magnetic pole position to the estimated magnetic pole position, and a third switch for switching from the detected speed to the estimated speed, when the sensor malfunction detector has detected a malfunction.Type: GrantFiled: May 4, 2016Date of Patent: September 5, 2017Assignee: Fanuc CorporationInventors: Kouki Kameta, Naoto Sonoda
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Publication number: 20170212499Abstract: A servo control apparatus includes a sensor unit for detecting a motor speed; an amplifier for driving a motor and feeding back a current; a magnetic pole position detector; a position controller for outputting a speed command; a speed controller for outputting a current command; a current controller for outputting a voltage command; a speed estimator for calculating an estimated speed from the voltage command; a magnetic pole position estimator for calculating an estimated magnetic pole position from the estimated speed; a sensor malfunction detector; a stop position command generator; and a first switch for switching from the position command to the stop position command, a second switch for switching from the magnetic pole position to the estimated magnetic pole position, and a third switch for switching from the detected speed to the estimated speed, when the sensor malfunction detector has detected a malfunction.Type: ApplicationFiled: April 10, 2017Publication date: July 27, 2017Applicant: Fanuc CorporationInventors: Kouki Kameta, Naoto Sonoda
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Publication number: 20170075337Abstract: A control device for a machine tool for cutting a rotationally-symmetric workpiece by a tool, includes a machining command making unit for making a machining command for an auxiliary motor based on rotation speeds of the workpiece and the tool, and feed rates of the tool and the workpiece, an oscillation command making unit for making an oscillation command for the auxiliary motor, based on the rotation speeds and the feed rates, so that the oscillation command is asynchronous with the rotation speed of the workpiece around the axis of rotation, and so that the tool intermittently cuts the workpiece, an addition unit for adding the oscillation command to the machining command, and a control unit for controlling the auxiliary motor based on the machining command to which the oscillation command has been added.Type: ApplicationFiled: September 15, 2016Publication date: March 16, 2017Applicant: FANUC CORPORATIONInventors: Kouki Kameta, Naoto Sonoda
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Publication number: 20170031349Abstract: A servo control system for controlling a plurality of axes of a machine tool, comprises: a plurality of servo control units for controlling the plurality of axes, respectively; a plurality of learning control units that are provided one each in the plurality of servo control units, and each configured to control a cyclic operation highly precisely; a common learning memory for storing correction data which at least a portion of the plurality of learning control units generates; a memory allocation unit for allocating at least a portion of a memory area in the learning memory to the axis that the learning control unit that generated the correction data controls; and a memory amount notifying unit for notifying the memory allocation unit as to the amount of memory that each of the plurality of learning control units of the respective axes requires.Type: ApplicationFiled: July 26, 2016Publication date: February 2, 2017Inventors: Kouki KAMETA, Naoto SONODA
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Publication number: 20170004857Abstract: A servo control system according to the present invention includes a servo control device for driving a driven body that operates periodically using a servomotor; and a learning controller for generating correction data based on a location deviation with respect to a uniform command pattern, and storing the correction data in delay memory and correcting the location deviation. The delay memory includes first memory having a short access delay time and second memory having a long access delay time. The servo control device includes a switching unit for assigning one of the first memory and the second memory to the learning controller, depending on a learning period according to the command pattern.Type: ApplicationFiled: June 28, 2016Publication date: January 5, 2017Inventors: Kouki KAMETA, Naoto SONODA
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Publication number: 20160334760Abstract: A servo control apparatus includes a sensor unit for detecting a motor speed; an amplifier for driving a motor and feeding back a current; a magnetic pole position detector; a position controller for outputting a speed command; a speed controller for outputting a current command; a current controller for outputting a voltage command; a speed estimator for calculating an estimated speed from the voltage command; a magnetic pole position estimator for calculating an estimated magnetic pole position from the estimated speed; a sensor malfunction detector; a stop position command generator; and a first switch for switching from the position command to the stop position command, a second switch for switching from the magnetic pole position to the estimated magnetic pole position, and a third switch for switching from the detected speed to the estimated speed, when the sensor malfunction detector has detected a malfunction.Type: ApplicationFiled: May 4, 2016Publication date: November 17, 2016Applicant: FANUC CORPORATIONInventors: Kouki Kameta, Naoto Sonoda
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Publication number: 20160291573Abstract: A servo control apparatus for a machine that performs machining by causing a plurality of synchronizing axes to operate cooperatively in synchronized relationship with a reference axis, the servo control apparatus comprising: a position detection unit for detecting at least one of the position of the servo motor and the position of a driven body; a position error calculation unit for calculating an error between the position command and the position detected by the position detection unit; a reference axis position acquisition unit for acquiring the positions of a plurality of reference axes; a reference axis selection unit for selecting one reference axis based on a machining condition of the driven body from among the plurality of reference axes whose positions have been acquired; and a learning control unit for performing learning control using an angle synchronization method, based on the error and the position of the selected reference axis.Type: ApplicationFiled: March 22, 2016Publication date: October 6, 2016Applicant: FANUC CORPORATIONInventors: Kouki Kameta, Naoto Sonoda
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Patent number: 9334911Abstract: A servo controller having a function for reducing an amount of dropping of a gravity axis provided with a machine. The Servo controller is configured to control a servomotor for driving a gravity axis of the machine, and includes a brake signal outputting part configured to output a brake activation signal and a brake release signal to a mechanical brake for holding the gravity axis; a torque command generating part which generates a torque command value for controlling the position of the servomotor; and a torque limiting value generating part which generates a torque limiting value for limiting the torque command value. The torque limiting value generating part continuously reduces the torque limiting value from a first value larger than a torque corresponding to the gravity force to a second value smaller than the torque corresponding to the gravity force, after the brake activation signal is output.Type: GrantFiled: November 20, 2014Date of Patent: May 10, 2016Assignee: FANUC CORPORATIONInventor: Kouki Kameta
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Publication number: 20150145465Abstract: A servo controller having a function for reducing an amount of dropping of a gravity axis provided with a machine. The Servo controller is configured to control a servomotor for driving a gravity axis of the machine, and includes a brake signal outputting part configured to output a brake activation signal and a brake release signal to a mechanical brake for holding the gravity axis; a torque command generating part which generates a torque command value for controlling the position of the servomotor; and a torque limiting value generating part which generates a torque limiting value for limiting the torque command value. The torque limiting value generating part continuously reduces the torque limiting value from a first value larger than a torque corresponding to the gravity force to a second value smaller than the torque corresponding to the gravity force, after the brake activation signal is output.Type: ApplicationFiled: November 20, 2014Publication date: May 28, 2015Inventor: Kouki KAMETA
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Patent number: 8049457Abstract: A press machine controller (10) for controlling a press machine (30) having a servo motor (41) to drive a slide (38) via a reduction mechanism (37) changed in reduction ratio in accordance with the position of the slide (38) is disclosed. The device includes a command generator (20) for generating at least one of a position command, a speed command and a torque command for the servo motor (41); a vibration command generator (13) for generating a vibration command based on a parameter preset for the press machine controller (10); a slide position detector (12) for detecting the position of the slide (38); and a vibration command adding portion (21, 22, 23) for adding the vibration command to any one of the position command, the speed command and the torque command for the servo motor (41) in the case where the slide position is in a predetermined range. The press machine, even if stopped with the slide at the bottom dead center, can be restarted with a small torque.Type: GrantFiled: April 19, 2010Date of Patent: November 1, 2011Assignee: Fanuc LtdInventors: Tadashi Okita, Hiroyuki Kawamura, Kouki Kameta
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Publication number: 20110006719Abstract: A press machine controller (10) for controlling a press machine (30) having a servo motor (41) to drive a slide (38) via a reduction mechanism (37) changed in reduction ratio in accordance with the position of the slide (38) is disclosed. The device includes a command generator (20) for generating at least one of a position command, a speed command and a torque command for the servo motor (41); a vibration command generator (13) for generating a vibration command based on a parameter preset for the press machine controller (10); a slide position detector (12) for detecting the position of the slide (38); and a vibration command adding portion (21, 22, 23) for adding the vibration command to any one of the position command, the speed command and the torque command for the servo motor (41) in the case where the slide position is in a predetermined range. The press machine, even if stopped with the slide at the bottom dead center, can be restarted with a small torque.Type: ApplicationFiled: April 19, 2010Publication date: January 13, 2011Applicant: FANUC LTDInventors: Tadashi OKITA, Hiroyuki KAWAMURA, Kouki KAMETA