Abstract: The invention relates to a robot system for detection of an operation anomaly. The robot system comprises: an industrial robot; a robot controller configured to control operation of said industrial robot; a robot operation program which is executable by said robot controller to operate said industrial robot according to a robot operation cycle; respective program nodes integrated in said robot operation program, wherein each of said respective program nodes is associated with a separate operational element of said robot operation cycle; wherein said robot controller is configured to obtain reference data based on operation parameters associated with execution of said robot operation program; and an anomaly detection block which for at least one of said respective program nodes is configured to evaluate an operation anomaly of said robot operation parameters relative to a representation of said reference data.

Abstract: Method and robot arm, where the motor torques of the joint motors of a robot arm are controlled based on a static motor torque indicating the motor torque needed to maintain the robot arm in a static posture, where the static motor torque is adjusted in response to a change in posture of the robot arm caused by an external force different from gravity applied to the robot arm. Further the motor torque of the joint motors is controlled based on an additional motor torque obtained based on a force-torque provided to the robot tool flange, where the force-torque is obtained by a force-torque sensor integrated in the tool flange of the robot arm.

Abstract: Methods and robot, where payload information of a payload attached to a robot tool flange of a robot arm are obtained by arranging the robot tool flange in a plurality of different orientations in relation to gravity; obtaining the force and the torque provided to the robot tool flange by gravity acting on the payload using a force torque sensor arranged at the robot tool flange; obtaining the mass of the payload based on the obtained forces obtained at at least two of the different orientations. The dependent claims describe possible embodiments of the robot and methods according to the present invention.

Abstract: Method and robot arm, where the motor torques of the joint motors of a robot arm are controlled based on a static motor torque indicating the motor torque needed to maintain the robot arm in a static posture, where the static motor torque is adjusted in response to a change in posture of the robot arm caused by an external force different from gravity applied to the robot arm. Further the motor torque of the joint motors is controlled based on an additional motor torque obtained based on a force-torque provided to the robot tool flange, where the force-torque is obtained by a force-torque sensor integrated in the tool flange of the robot arm.