MOTOR DRIVE DEVICE
    1.
    发明申请

    公开(公告)号:US20210135604A1

    公开(公告)日:2021-05-06

    申请号:US17081460

    申请日:2020-10-27

    申请人: FANUC CORPORATION

    IPC分类号: H02P3/14

    摘要: A motor drive device includes: a converter converting an AC voltage supplied from an AC power supply into a DC voltage; a smoothing capacitor smoothing the DC voltage output from the converter; an inverter converting the DC voltage smoothed by the smoothing capacitor into an AC voltage to drive a motor; a regenerative circuit that is disposed between the smoothing capacitor and the inverter, includes a first resistor and a first switch, and short-circuits the ends of the smoothing capacitor through the first resistor by turning on the first switch; and a control unit keeping the first switch in the OFF state during an emergency stop.

    Brake control system and method of fault detection

    公开(公告)号:US10763765B2

    公开(公告)日:2020-09-01

    申请号:US16258926

    申请日:2019-01-28

    申请人: FANUC CORPORATION

    摘要: A brake control system includes: a plurality of motors each provided with a brake device and a position detecting section; and a brake control device that controls a plurality of the brake devices using one brake-oriented power source. The position detecting section includes a position detecting circuit section and a communication circuit section. The brake device includes: a current detecting section that detects a brake current flowing through a brake coil of an electromagnetic brake; and an insulating circuit section that electrically insulates the current detecting section and the communication circuit section. The communication circuit section transmits to the brake control device the brake current acquired via the insulating circuit section. The brake control device includes a fault specifying section that specifies the faulty brake device based on a plurality of detection signals detected by a plurality of the current detecting sections.

    Motor driving device and failure detecting method

    公开(公告)号:US10715059B2

    公开(公告)日:2020-07-14

    申请号:US16241094

    申请日:2019-01-07

    申请人: FANUC CORPORATION

    摘要: A motor driving device controls braking of multiple motors each having a braking device by using a single brake power supply. The braking device includes: an electromagnetic brake that releases braking of a rotary shaft of the motor by energizing a brake coil; a conductive disk configured to rotate together with the rotary shaft and connected in series with the brake coil; and a plurality of resistors provided on a surface of the disk so as to be periodically connected in series with the brake coil as the disk rotates. The motor driving device identifies a failed braking device of the braking devices, based on the current value of the current flowing from the brake power supply and the rotational positions of the rotary shafts of the multiple motors.

    Motor drive apparatus equipped with life prediction function for motor brake

    公开(公告)号:US09933034B2

    公开(公告)日:2018-04-03

    申请号:US15289238

    申请日:2016-10-10

    申请人: FANUC CORPORATION

    IPC分类号: F16D66/02 B60T17/22

    CPC分类号: F16D66/022 B60T17/221

    摘要: A motor drive apparatus includes: a motor current detection unit; a brake release determination unit that determines that the brake is not released when the motor current detected when the motor is operated under a predetermined load by application of a voltage to a brake coil is larger than a current for when the brake is normally released; a brake coil voltage change unit that changes a voltage applied to the brake coil when it is determined that the brake is not released to a larger value; a change history storage unit that stores the voltage after being changed and change date and time; and a life prediction unit that calculates a predicted life of the brake apparatus based on the voltage after being changed and the change date and time and the previously stored failure-time brake coil voltage.

    Motor drive device having failure detection function

    公开(公告)号:US10823783B2

    公开(公告)日:2020-11-03

    申请号:US16157567

    申请日:2018-10-11

    申请人: FANUC CORPORATION

    摘要: A motor drive device includes an inverter configured to convert a DC voltage to an AC voltage by switching power devices, a current detector configured to detect a current output from the inverter, a current controller configured to generate a voltage command, a control signal generator configured to control switching of the power devices, a dynamic brake circuit provided with relays and configured to short-circuit an output side terminal of the inverter via resistances, a storage configured to store an initial current value and a first threshold value, and a failure determiner configured to compare a current value and an initial current value after a predetermined time has elapsed since detection of the initial current value, and determine presence or absence of a failure based on a result of comparing a change rate of the current value from the initial current value with the first threshold value.

    Conduction path structure of robot

    公开(公告)号:US10456932B2

    公开(公告)日:2019-10-29

    申请号:US15828484

    申请日:2017-12-01

    申请人: FANUC CORPORATION

    IPC分类号: B25J19/00 B25J18/00 B25J19/06

    摘要: A conduction path structure of a robot in which a conduction path has a simplified structure is provided. A conduction path structure of a robot includes: a structural mechanism which functions as a support and has a conductor portion; an actuator that operates the structural mechanism; and a conduction path through which driving power and/or a control signal is supplied to the actuator, wherein the conduction path also serves as the conductor portion of the structural mechanism.

    BRAKE CONTROL SYSTEM AND METHOD OF FAULT DETECTION

    公开(公告)号:US20190238070A1

    公开(公告)日:2019-08-01

    申请号:US16258926

    申请日:2019-01-28

    申请人: FANUC CORPORATION

    摘要: A brake control system includes: a plurality of motors each provided with a brake device and a position detecting section; and a brake control device that controls a plurality of the brake devices using one brake-oriented power source. The position detecting section includes a position detecting circuit section and a communication circuit section. The brake device includes: a current detecting section that detects a brake current flowing through a brake coil of an electromagnetic brake; and an insulating circuit section that electrically insulates the current detecting section and the communication circuit section. The communication circuit section transmits to the brake control device the brake current acquired via the insulating circuit section. The brake control device includes a fault specifying section that specifies the faulty brake device based on a plurality of detection signals detected by a plurality of the current detecting sections.

    Robot with daisy-chainable robot arm

    公开(公告)号:US10300598B2

    公开(公告)日:2019-05-28

    申请号:US15484634

    申请日:2017-04-11

    申请人: FANUC CORPORATION

    IPC分类号: B25J9/12 G05B19/00 H02P5/74

    摘要: A robot includes a motor drive power source for converting a voltage supplied from a power source to a motor drive unit-grade voltage and outputting it, a motor drive unit for converting a motor drive unit-grade voltage output from the motor drive power source to a motor drive voltage and outputting it, a motor driven to be rotated by a motor drive voltage output by the motor drive unit, a robot arm on which the motor drive unit and the motor are arranged, and a robot controller which is provided independently of the robot arm and on which the motor drive power source is arranged.

    Brake drive and control device for detecting short circuit failure of switching element
    9.
    发明授权
    Brake drive and control device for detecting short circuit failure of switching element 有权
    用于检测开关元件短路故障的制动驱动和控制装置

    公开(公告)号:US09050961B2

    公开(公告)日:2015-06-09

    申请号:US14019050

    申请日:2013-09-05

    申请人: FANUC CORPORATION

    摘要: A first switching element is connected to one end of a brake and switches from the off state to the on state when a switch command is input to cause a brake drive current to flow through the brake. A second switching element is connected to the other end of the brake and switches from the off state to the on state when the switch command is input to cause a brake drive current to flow through the brake. A voltage detection unit detects a brake voltage being applied to the brake. A switch command delay unit delays the switch command input to the first switching element. A short circuit determination unit determines whether or not a short circuit has occurred in the first switching element based on the brake voltage and the switch command delayed by the switch command delay unit.

    摘要翻译: 第一开关元件连接到制动器的一端,并且当输入开关命令以使制动器驱动电流流过制动器时,从断开状态切换到接通状态。 第二开关元件连接到制动器的另一端,当输入开关指令以使制动器驱动电流流过制动器时,从断开状态切换到接通状态。 电压检测单元检测施加到制动器的制动电压。 开关指令延迟单元延迟对第一开关元件的开关命令输入。 短路确定单元基于制动电压和由开关指令延迟单元延迟的开关指令来确定第一开关元件中是否发生短路。

    MOTOR DRIVE DEVICE HAVING FAILURE DETECTION FUNCTION

    公开(公告)号:US20190113576A1

    公开(公告)日:2019-04-18

    申请号:US16157567

    申请日:2018-10-11

    申请人: FANUC CORPORATION

    IPC分类号: G01R31/34 H02P3/18 H02P27/06

    摘要: A motor drive device includes an inverter configured to convert a DC voltage to an AC voltage by switching power devices, a current detector configured to detect a current output from the inverter, a current controller configured to generate a voltage command, a control signal generator configured to control switching of the power devices, a dynamic brake circuit provided with relays and configured to short-circuit an output side terminal of the inverter via resistances, a storage configured to store an initial current value and a first threshold value, and a failure determiner configured to compare a current value and an initial current value after a predetermined time has elapsed since detection of the initial current value, and determine presence or absence of a failure based on a result of comparing a change rate of the current value from the initial current value with the first threshold value.