Abstract:
An industrial robot has a tool flange (8) at the end of an outer arm of the robot with means (10) for securing a tool (7) thereto and sensor means adapted to sense forces and/or torques applied to a tool secured to said tool flange. The sensor means (26) is built into the structure of the robot in the region of said tool flange.
Abstract:
A method for maintaining a desired repetition accuracy in an industrial robot system comprising at least one manipulator with control equipment wherein the manipulator includes at least one mechanical structural part (1) comprising a drive unit (8), which during operation generates an amount of loss energy (W) which varies with time and which, after a time (Δt), causes a temperature change (ΔT) and a corresponding thermal deformation (Δu) of the structural part and hence a displacement (ΔP1) of the working point (P) of the system.
Abstract:
The present invention relates to servo controller for controlling a plurality of motors including a master motor (M 1 ) and a slave motor (M 2 ) cooperatively driving a movable member. The servo controller is configured to control the master motor and the slave motor based on position references (pos ref ) for the master motor, the servo controller comprises a master speed controller (6a) configured to calculate a reference torque (τ ref1 ) for the master motor based on speed errors (v err1 ) for the master motor. The slave speed controller (6b) is configured to calculate refer ence torques (τ ref2 ) for the slave motor based on speed errors (V err2 ) for the slave motor. Each of the reference torques includes a proportional torque part (τ p1 ,τ p2 ) and an integral torque part ((τ I1 ,(τ I2 ). The servo controller is configured to calculate each of the integral torque parts based on the speed errors of the master motor and the speed errors of the slave motor, such that the torques due to the integral torque parts will be distributed equally between the master and slave motors or according to a predefined ratio.
Abstract:
The invention concerns a method, robot arrangement and computer program product for tuning a dynamical model of an industrial robot (10) on a foundation (26). The parameter determining device comprises a model memory with a first dynamical model of the robot, the first dynamical model comprising first model parameters representing dynamical properties of the robot; and a second dynamical model of a foundation (26) to which the robot is to be attached, the second dynamical model comprising second model parameters representing dynamical properties of the foundation, and a parameter adjusting unit (36) that obtains information about dynamical properties of the foundation by ordering the actuator (20) to move the robot (10) and by receiving, from the detector (22), measurements of at least one property affected by the movement; and set at least one of the second model parameters on the basis of the dynamical properties of the foundation.
Abstract:
Verfahren zum Erkennen eines Bremsenzustandes einer Bremsvorrichtung (10) Roboterantriebes mit einer Rahmenvorrichtung (20), die durch ein erstes bewegliches Rahmenelement (28) im Bedarfsfall Bremskräfte auf ein rotierendes Bauteil des Roboterantriebes aufbringt. Dadurch wird die Bremsvorrichtung (10) in wenigstens zwei Betriebszustände, insbesondere ein Zustand geschlossenen oder ein Zustand geöffnet versetzt. Dabei wird während des Überganges der Bremsvorrichtung (10) vom einen in den anderen Zustand wenigstens ein Messsignal aufgenommen, und durch einen Vergleich des wenigstens einen Messsignals mit zuvor festgelegten Referenzwerten ein Bremsenzustand ermittelt. Zudem betrifft die Erfindung eine Bremsvorrichtung auf der das vorstehende Verfahren durchführbar ist.
Abstract:
The present invention relates to a device for compensating gain errors of current sensors used in a three-phase inverter (3). The inverter comprises a plurality of switches (10a-b,11a-b,12a-b) configured to switch the current in the three phases in response to control signals (S1-S6). The current ina first phase (6a) is measured by a first current sensor (2a) and the current in a second phase (6c) is measured by a second current sensor (2b). The device comprises: a control unit (8) configured, during a calibration period, to generate control signals to control the switches so that the same current is running through the first and second phases, a data storage (14) configured to store sensor values (X,Y) from the first and second current sensors during the calibration period, a computing unit (16) configured to calculate at least one gain compensating parameter (P G ) based on said stored sensor values, and a compensating unit (18) configured, during normal operation of the inverter, to compensate for differences in gain between the first and second sensors based on said gain compensating parameter.