An electric motor control device performing feedback control of a state amount of an electric motor or a load and being capable of changing a control bandwidth of a feedback control system includes: a notch filter arranged in the feedback control system and having a filter coefficient which is changeable; a notch control section which changes a notch frequency as a center frequency of the notch filter to remove an oscillation component attributable to mechanical resonance related to the electric motor; and a control coefficient setting section which changes at least one of the control bandwidth or the filter coefficient of the notch filter in accordance with the control bandwidth and the notch frequency to stabilize the feedback control system.

A robot control device includes: a processor that is configured to execute computer-executable instructions so as to control a robot, wherein the processor is configured to: receive a first instruction from an operation device; display information regarding a target vibration frequency of a robot obtained based on vibration data indicating vibration of the robot in a certain time section on a display, when the processor receives the first instruction; set the target vibration frequency; generate a second control signal obtained by reducing the target vibration frequency from a first control signal based on the set target vibration frequency; and generate a driving signal to drive the robot based on the second control signal and output the driving signal.

An abnormality detection method for detecting an abnormality of an encoder provided for a robot includes: obtaining corrected position information according to commanded position information output from a controller that designates the rotational position of a motor and an output signal output from the encoder; and, determining, after comparing the corrected position information with the detected position information according to the output signal output from the encoder, the abnormality of the encoder, if there is a difference greater than or equal to a predetermined value between the corrected position information and the detected position information. The controller removes a vibration component of the robot corresponding to the weight of an attachment load from the commanded position information and compensates for a time delay to obtain the corrected position information.

A numerical controller includes: a vibration amplitude specifying unit for specifying an amplitude of a vibration component generated by a blade of a tool being brought into contact with a workpiece at a predetermined cycle, due to rotation of a spindle out of a spindle load; a gain calculating unit for calculating a gain of PID control such that an output of the feed speed is uninfluenced by the amplitude, based on the amplitude of the vibration component specified by the vibration amplitude specifying unit; and a speed control unit for outputting a feed speed of the spindle controlled by the PID control, by using the gain calculated by the gain calculating unit.

A motor control device includes: a position command section configured to generate a position command for a control object; a position detecting section configured to detect a position of the control object or a position of a motor configured to drive the control object; and a position control section configured to control a position of the motor based on the position command and the detected position of the control object or the motor, in which at least one of the position command section and the position control section includes a vibration suppression filter configured to approximate a reverse characteristic of a vibration characteristic generated between the motor and the control object, and the vibration suppression filter changes a vibration suppression frequency according to at least one of the position and a mass of the control object.

A control device includes: a processor that is configured to execute computer-executable instructions so as to control a robot, and the processor is configured to receive an instruction to execute a specific operation which is an operation determined in advance; and an amplifier that causes a motor of a robot to execute the specific operation when the processor receives the instruction to execute the specific operation; wherein the processor is configured to receive a measurement result of vibration measured by a measurement device installed in the robot from the measurement device in the execution of the specific operation.

A control device includes a second-control-signal generating section configured to reduce a predetermined frequency component from a first control signal for performing operation for moving a movable section of the robot to generate a second control signal and a storing section having stored therein reference information including information concerning combinations of ranges of positions of a control point of the robot and frequencies. The second-control-signal generating section determines, based on a position of the control point of the robot in the operation, with reference to the reference information, a frequency component to be reduced from the first control signal.

A robot system includes: a learning control unit configured to perform learning for calculating a learning correction amount for bringing a position of a control target portion toward a target position; a robot control unit configured to control the operation of the robot mechanism unit; a power spectrum calculating unit configured to calculate a power spectrum of a vibration data of the control target portion; a comparison unit configured to compare each power spectrum between at the time of the current learning and at the time of the immediately preceding learning; and a learning correction amount updating unit configured to adjust at least one of a phase and a gain of the learning correction amount used at the time of the current learning to set the adjusted learning correction amount as a new learning correction amount used at the time of next learning.

An electric motor control device performing feedback control of a state amount of an electric motor or a load and being capable of changing a control bandwidth of a feedback control system includes: a notch filter arranged in the feedback control system and having a filter coefficient which is changeable; a notch control section which changes a notch frequency as a center frequency of the notch filter to remove an oscillation component attributable to mechanical resonance related to the electric motor; and a control coefficient setting section which changes at least one of the control bandwidth or the filter coefficient of the notch filter in accordance with the control bandwidth and the notch frequency to stabilize the feedback control system.

The invention relates an apparatus for analysing movement of an arrangement made of a plurality of bodies assigned to a platform, of which at least one is provided with a drive, in particular of the hexapod type or of the articulated arm type, having means for vibration analysis and/or force analysis. According to the invention, the apparatus has in a modular construction a vibration analysis module for analytically determining natural vibration modes of the bodies and/or of the platform in respect of at least one of the following variables: frequency, centre of rotation of the torsional component of the vibrations, axis of rotation of torsional vibration, displacement vector of a Cartesian vibration, amplitude ratio of the vibrations in relation to one another, and/or a force analysis module for analytically determining the acceleration forces and/or weights and/or torques, occurring on a predetermined trajectory, in respect of the bodies and/or the platform.