公开(公告)号：US10720872B2

公开(公告)日：2020-07-21

申请号：US16043162

申请日：2018-07-24

Applicant: FANUC CORPORATION

Inventor： Shunpei Tanaka ,  Shinichi Horikoshi ,  Yuuta Sekikawa ,  Kenta Yamamoto

IPC: H02P27/08 ,  G05B19/406 ,  H02P5/74 ,  H02P29/032

Abstract: A motor control device includes a rectifier which converts AC power into DC power and outputs it to a DC link, an inverter which converts the DC power of the DC link into AC power for each motor and outputs it, an AC voltage detection unit which detects an AC voltage value on the AC input side of the rectifier, a state determination unit which determines that a voltage dropped state has been set when the AC voltage value is smaller than a certain specified voltage and that a normal state has been set when the AC voltage value is equal to or larger than the specified voltage, and an output control unit which controls each motor in accordance with the amount of voltage drop with respect to the specified voltage of the AC voltage value when the state determination unit determines that the voltage dropped state has been set.

公开(公告)号：US10514673B2

公开(公告)日：2019-12-24

申请号：US15952267

申请日：2018-04-13

Applicant: FANUC CORPORATION

Inventor： Shunpei Tanaka ,  Kenta Yamamoto

IPC: G05B19/18 ,  G05B19/404

Abstract: A control device of a machine tool includes an oscillation command generation part which generates an oscillation command for at least one feed axis based on a rotation speed of a spindle and a position command of the at least one feed axis so that the oscillation command becomes a positive non-integral multiple of the rotation speed and a tool intermittently cuts a workpiece, an oscillation command correction part which corrects the oscillation command using the position of the feed axis, and an addition part which adds the oscillation command corrected by the oscillation command correction part to a position deviation between the position command and the detected position of the feed axis.

公开(公告)号：US10439504B2

公开(公告)日：2019-10-08

申请号：US16295195

申请日：2019-03-07

Applicant: FANUC CORPORATION

Inventor： Shunpei Tanaka

IPC: H02M5/458 ,  H02M1/42 ,  G01R31/02 ,  H02M7/219 ,  H02M1/00

Abstract: A power converter device includes: a rectifier configured to convert AC power into DC power based on a PWM control signal; a voltage detecting unit configured to detect a voltage of a smoothing capacitor that is connected on a DC side of the rectifier; a capacitance estimating unit configured to estimate capacitance of the smoothing capacitor; a voltage control unit configured to calculate a voltage loop gain from the estimated capacitance and generate a control voltage from the voltage loop gain and an error between a command voltage and the detected voltage; and a PWM control unit configured to generate the PWM control signal by using the control voltage and control the rectifier.

公开(公告)号：US10317884B2

公开(公告)日：2019-06-11

申请号：US15882014

申请日：2018-01-29

Applicant: FANUC CORPORATION

Inventor： Kazunori Iijima ,  Shunpei Tanaka

IPC: G05B19/416 ,  G05B19/404 ,  G05B19/39

Abstract: A servo controller includes a speed command creation unit, a torque command creation unit, a speed detection unit, a speed control loop, a speed control gain, a filter, a parameter storage unit, a sinusoidal disturbance input unit, a frequency characteristics calculation unit, and a parameter adjustment unit. The parameter storage unit stores a history of past frequency characteristics obtained by the frequency characteristics calculation unit in correlation with past parameter history.

公开(公告)号：US20170310268A1

公开(公告)日：2017-10-26

申请号：US15466994

申请日：2017-03-23

Applicant: FANUC CORPORATION

Inventor： Shunpei Tanaka ,  Kenta Yamamoto

IPC: H02P29/024 ,  H02P27/08 ,  H02P6/14

CPC classification number: H02P29/025 ,  H02P6/14 ,  H02P27/08

Abstract: A motor control device includes: a rectifier that converts AC power supplied from an AC power supply side into DC power and outputs the DC power; an inverter that converts the DC power output from the rectifier into AC power for motor driving and outputs the AC power; an AC voltage detection unit that detects an AC voltage value of an AC power supply side of the rectifier; and a power failure detection unit that outputs, based on the AC voltage value detected by the AC voltage detection unit, several power failure detection signals in accordance with a predetermined power failure detection condition at a power failure on the AC power supply side of the rectifier.