Abstract:
The invention describes a method for controlling a group of machines such as robots 10, 11, 12, or pick and place machines to pick up an item from a first position and place the item in a second position. Information from a sensor 7 about the location of the first position 3 is provided to a control member 40 which sends a message from a master process to all machines. The message comprises a list of all first positions. The machines dynamically and adaptively handle each of the first positions and inform the master process when each first position is handled. The master process in turn informs all machines that a given first position has been handled. A system, a computer program and a graphical user interface are also described.
Abstract:
A method for fine tuning of a robot program for a robot application comprising an industrial robot, tool and a work object to be processed by the tool along a path comprising a number of desired poses on the work object, the robot program comprises a number of program instructions containing programmed poses corresponding to the desired poses, wherein the method comprises: defining a fine tuning coordinate system Xft, Yft, Zft, selecting one of said programmed poses pi, calculating said selected pose in the fine tuning coordinate system, producing program instructions for said selected pose in the fine tuning coordinate system, running said one or more program instructions by the robot, determining the difference between the pose obtained after running the program instructions and the desired pose, adjusting the fine tuning coordinate system in dependence of said difference, producing program instructions for said selected pose in the adjusted fine tuning coordinate system Xft’, Yft’, Zft’.
Abstract:
A robot wrist with a plurality of rotatable parts arranged in series with each other arranged to be mounted on a robot arm or automation machine to enable rotary movement of the first wrist part about a first axis, and a second wrist part 2 journalled in the first wrist part. Each wrist part 1, 2, may be arranged with one or more gear members to drive a rotary movement and rotate any wrist part relative to another wrist part, and at least one gear member of one engaging pair is a concave bevel gear arranged with negative bevel angle (Cn) to the plane of rotation (P) at the engaging face. In another embodiment the robot wrist has three wrist parts 1, 2, 3. The robot wrist may also comprise an inner protection hose.
Abstract:
A motor controller for controlling an electric motor including a soft starter and a human-machine interface for control and configuration of the soft starter, said soft starter comprising a visual display and selection means associated with the visual display; and a method to configure a motor controller for controlling an electric motor, including a soft starter and a human-machine interface for control and configuration of the soft starter. In other aspects the invention provides a computer program and graphic user interface for carrying out the method.
Abstract:
A method for stabilization of the power balance in an electric power system comprising a number of nodes, wherein an instantaneous value of the mains frequency of the electric power system is sensed and wherein, in dependence on the frequency deviation of said instantaneous value from a reference frequency value, a selected part of the electric power system, connected in a node, is disconnected in said node, and wherein a voltage amplitude value is sensed in said node, and wherein a measure of the magnitude of the deviation of said voltage amplitude value from a reference amplitude value is formed, and wherein a time lag is formed in dependence on said measure of the magnitude, and wherein said part of the electric power system is disconnected in dependence on said time lag.
Abstract:
Control system for regulating the flow of liquid metal in a device for casting a metal, comprising detection means to measure a process variable, a control unit to evaluate the data from the detection means and means to automatically vary at least one process parameter in order to optimize casting conditions. The detection means measure a characteristic of the meniscus at least two points on the meniscus instantaneously throughout the casting process.
Abstract:
A device (2) for control of a power flow in a three-phase ac transmission line (L2, La, Lb, Lc) has, for each of its phases (a, b, c), a transformer (12a, 12b, 12c) with a primary winding (121c) and a secondary winding (122c). The secondary winding is serially connected into the respective phase of the transmission line. A voltage dependent on a controllable part of the voltage between the other two phases of the transmission line is applied to the primary winding of the transformer.
Abstract:
A collision test device, comprising a tow rope (3), a means (9-14) for driving the tow rope (3), and a means (20) for connecting the tow rope to an object (1) that is to be accelerated by means of the moving tow rope (3) and subjected to a collision test. The collision test device further comprises a second means (21, 22) for connecting the tow rope (3) to said object (1) and operating as a brake device for subsequent deceleration of the object (1), and the second connecting means (21, 22) comprises a trolley (21) that is attached to the tow rope (3), to be able to conduct a pre-crash deceleration impact test.
Abstract:
The invention relates to a device for monitoring a surge arrester connected to a power network, comprising a registering unit (1) and means (63, 66) for attachment of the registering unit to the surge arrester. The registering unit comprises a grounding line (16), which is adapted to conduct a current flowing through the surge arrester to ground, means (4) for registration of a current passing through the gounding line (16) from the surge arrester, a member (9) for registration of current pulses passing through the surge arrester, and a storage member (5) for storing data concerning the current passing through the grounding line (16) from the surge arrester and data concerning registered current pulses. The registering unit (1) further comprises a field probe (17) connected to ground, a sensor (18) for registration of the current flowing between the field probe (17) and ground, and a time meter (3), the storage member (5) being adapted to store the data concerning the current passing through the grounding line (16) from the surge arrester and the data concerning the current flowing between the field probe 817) and ground associated to a time information determined by means of the time meter (3). The invention also relates to a system comprising one or several such registering units.
Abstract:
In a method for control of a converter for conversion of dc voltage into ac voltage or dc voltage and vice versa, in which an output of the converter may alternatively be connected to a positive pole (7), a negative pole (8) or a centre (23) of a dc voltage side of the converter in the form of different so-called main states, there is carried out, when changing between main states via a so-called minor commutation loop, an extra sequence in the form of a delayed turn-on of semiconductor elements (13, 16) in one unit of the converter relative to semiconductor elements (14, 15) in another unit in a pair of units of the converter.