Abstract:
A method of controlling a current of a three-phase electric motor by means of a three-phase controller comprises adjusting the firing angles so as to leave a range of firing angles in which the DC components appear.
Abstract:
The present invention relates to a device (1) for adjusting the backlash in bevel gears (7) in an industrial robot. The bevel gears (7) comprise a first conical gear wheel (13) with a first axis of rotation (A) and a second conical gear 0 wheel (14). The device (1) comprises a displaceably arranged holder member (15) adapted to fix and rotatably journal the first gear wheel (4) for rotation about the first axis of rotation (A).
Abstract:
The invention relates to a method in an automated system for handling at least two versions of an application. The system comprises a controller 8 for automation of a process by means of the application stored thereon in bidirectional connection with a communication server 2. The communication server 2 is in turn in bidirectional connection with at least two clients. By means of the method an improved communication between a communication server and several clients are provided. Graphics and images can be displayed without reconfiguration when a new version of an application is used. The invention also relates to such system.
Abstract:
The invention relates to a method for comparing variable values obtained from different versions of an application program in an automated system. An input signal obtained from an automated process is inputted to at least two different versions of the application program residing within a same controller. The same tasks are executed based on the input signal for the different versions, and process related variable values obtained from the execution of the versions are stored in memory locations known by the controller. Variable values from the different versions and derived from corresponding execution steps of the versions are retrieved from the memory locations, and compared during an idle time. An improved way of revising an automation system is thereby achieved. The invention also relates to such controller and an automation system.
Abstract:
A method for controlling a multi-axis industrial robot or manipulator arranged with a robot control unit, the robot or the control unit also comprising at least one first computer (10) running a servo controller. A motion limit is configured for at least one axis of said robot arm. A reference signal (1) for a robot position is sent to a robot controller (13) together with a measurement of a position of said robot arm. The reference position is processed and the measured position and the processed reference position are then compared in an evaluator (4) for the purpose of limiting the motion of an arm of said robot.
Abstract:
The invention refers to a method and a device for tuning and control of industrial processes having varying material flow rate. The device comprises an adder (10b) for adding excitation signals to the controller output signal (U(t)), a measurement system (6) for measuring said property in response to said excitation signals, a model based tuning unit (10c) adapted to estimate the value of at least one parameter with unknown value of a process model structure describing the effect of varying material flow rate, based on said measurements (z(t)) of said property and the output signal (u(t)) from the controller, and to calculate a model that describes the dynamics from controller output to controller input based on the estimated value of said parameter, and to perform model based tuning of the controller based on said model that describes the dynamics from controller output to controller input.
Abstract:
A method for controlling a multi-axis industrial robot or manipulator arranged with a robot control unit, the robot or the control unit also comprising at least one first computer (10) running a servo controller. A motion limit is configured for at least one axis of said robot arm. A reference signal (1) for a robot position is sent to a robot controller (13) together with a measurement of a position of said robot arm. The reference position is processed and the measured position and the processed reference position are then compared in an evaluator (4) for the purpose of limiting the motion of an arm of said robot.
Abstract:
A method for controlling a multi-axis industrial robot or manipulator arranged with a robot control unit, the robot or the control unit also comprising at least one first computer (10) running a servo controller. A motion limit is configured for at least one axis of said robot arm. A reference signal (1) for a robot position is sent to a robot controller (13) together with a measurement of a position of said robot arm. The reference position is processed and the measured position and the processed reference position are then compared in an evaluator (4) for the purpose of limiting the motion of an arm of said robot.
Abstract:
An arm part (204) of a manipulator of an industrial robot has at each end thereof means for connecting the arm part to a gear and means for stiffening the end region of the arm part. At least one aperture (223, 224) is arranged in a hollow structure (221 ) of said stiffening means for providing access to connecting members (212).
Abstract:
A device for measuring the pressure in a gas, wherein the device comprises: a framework (10), a channel extending through the framework, the channel comprising in the axial direction a introductory section including an opening for receiving the gas, a measuring section (B) having a wall, and a final section, the end of which is closed during measuring, measuring units (11, 12) for measuring radial forces acting on the wall of the measuring section, the measuring unit comprising a measuring body (13, 14) standing in mechanical contact with a first portion of the wall of the measuring section, a cooling body (18) for transporting heat from the walls of the measuring section to the framework, wherein the cooling body is standing in thermal contact with a second portion of the wall of the measuring section and with the framework.