Abstract:
The present invention relates to an industrial robot system comprising a manipulator (1), a robot controller (2) configured to control the movements of the manipulator based on jog commands during a manual mode, an enabling unit (7) including an enabling device, and the enabling unit is configured to transfer information regarding the state of the enabling device to the robot controller, and the robot controller controls the movements of the manipulator during manual mode in dependence on the state of the enabling device. The system further comprises at least two general purpose devices (6, 8) each including a user interface adapted to allow jogging of the manipulator, an authorization handler configured to send a request to the robot controller for authorization to take over control of the robot during manual mode,and a jog command module configured to send jog commands to the robot controller in response to user interactions with the user interface. The robot controller is configured to grant or deny the requests for authorization, and to control the movements of the manipulator during manual mode based on the received jog commands provided that the general purpose device sending the jog commands has been authorized control of the robot during manual mode.
Abstract:
A switching device (1 15, 300) for an on-load tap changer (100) is disclosed. The switching device is designed for providing electrical connection between a fixed contact (135) and an external output (155) of the tap changer. The switching device provides: a main current path comprising a main switch (140) which is series-connected in the main current path; and a transition current path comprising a transition inductor (400) and a transition switch (145). The transition switch and the transition inductor are connected in series. The impedance of the transition current path is higher than the impedance of the main current path, the impedance of the transition current path being mainly inductive. The main switch and the transition inductor are connected in parallel, so that upon opening of the main switch, a load current flowing through the main current path will be commutated to the transition current path.
Abstract:
A multilevel converter (10) converting between AC and DC comprises a phase arm with a number of cells between a DC pole (P1) and an AC terminal (AC1), the cells comprise at least one hybrid full bridge cell (HFBA) including a first cell connection terminal for coupling to the DC pole, a second cell connection terminal for coupling to the AC terminal, an energy storage element (C) having a positive and a negative end, a first group of series connected semiconducting units (S1, S2) in parallel with the energy storage element (C), where a junction between these forms one cell connection terminal, and a second group of series connected semiconducting units in parallel with the energy storage element (C) and comprising a third semiconducting unit (S3) and a fourth semiconducting unit consisting of a number of unidirectional conducting elements comprising at least one unidirectional conducting element (D), where a junction between these forms a further cell connection terminal.
Abstract:
A miniature crawler to crawl on surface of an object, comprising a chain having at least two driving units connected in series and at least a part of the driving units including piezoelectric element therein; and two anchoring elements connected with two ends of the chain, each of which is configured to be releasably fixed onto the surface. The present invention further provides a miniature inspector including a miniature crawler as described above and an inspecting device attached onto the crawler.
Abstract:
The invention concerns the control of cells in a phase leg of a multilevel converter through regulating, using tap-changer control, the modulation index of the converter to above 0.80, providing a group of carrier waves (CAR) for the phase leg, where these carrier waves are identical but displaced in time from each other with a time delay, providing a voltage reference (Vref) for the phase leg being separate from voltage references provided for other phase legs, stop switching of the cells when waveform values of a power transmission converter waveform are detected to be in a selected interval (IV) around a peak value (PV1, PV2) of the power transmission converter waveform (Vref) and control switching of the cells based on comparisons of the respective carrier waves with the voltage reference (Vref) when the waveform values of the power transmission converter waveform are detected to be outside the selected interval (IV).
Abstract:
A component feeder (10) comprises a lift (50) for elevating a selection of components (30) from a bulk storage, and a pick surface (100) adjacent to the lift (50) for receiving the selection of components (30). The pick surface (100) is configured to move below the selection of components (30) to receive them. Consequently, movement of the pick surface (100) can be utilized for receiving the selection of components (30) on it.
Abstract:
A semiconductor assembly (10) comprises a stack (38) with a semiconductor module (20a) and a cooler (30a), wherein the semiconductor module (20a) is provided in contact with the cooler (30a). A clamping assembly (40) is adapted to exert a force (F) on the two sides of the stack. The stack is provided with a through hole (26, 36) between the two sides thereof and a part of the clamping assembly (40) comprises an electrically conductive part which extends through the through hole (26, 36) of the stack. Thereby, a compact mechanical arrangement is provided while obtaining improved electrical properties, such as lower inductance and more even current distribution.
Abstract:
The present invention relates to a recirculating cooling unit (1) comprising a plurality of components (7−13) which require supervision and maintenance. The interior of the cooling unit comprises an open space, named a service area, designed to house a human working in the space, and the components are arranged so that they are accessible from the service area, and the cooling unit is provided with an opening design to allow a human to enter into the cooling unit and to enter the service area.
Abstract:
It is provided a phase converter (301a-c, 301) for converting between AC and DC. The phase converter comprises: a positive phase DC connection (50i) and a negative phase DC connection (50ii); a first converter cell (400a) and a second converter cell (400b) serially connected between the positive phase DC connection (50i) and the negative phase DC connection (50ii); and a transformer (17a-c, 17) comprising two component windings (62a-b) on a first side and a main winding (63) on a second side. A phase AC connection (69a-b) of the phase converter is provided connected to the main winding (63); wherein each one of the first converter cell (400a) and the second converter cell (400b) comprises a four quadrant converter; an energy storage element (68) and an AC connection (65a-b); the AC connections (62a-b) of the first converter cell (400a) and the second converter cell (400b) are respectively connected to the component windings (62a-b) of the transformer; and the first converter cell (400a) and the second converter cell (400b) are individually controllable in terms of phase angle on their respective AC sides.
Abstract:
The invention discloses temporary load device (2) comprised in a subsea distribution bus (14) connecting a power load system (3) to electrical power supplied by an AC power supply (1) by means of at least one long cable (7). The subsea distribution bus (14) comprises a local control unit (4), and a temporary load device (2), which is arranged, upon receipt of a first signal from the local control unit, to close and reduce the voltage to the power load (3), and, on receipt of a second signal is arranged to open and disconnect said temporary load device (2) from the subsea distribution bus (14) having avoided or reduced an overvoltage, or a load drop, at the power load system (3). The temporary load device (2) may be used to mitigate a measured or estimated over-voltage or other voltage fault condition such as voltage oscillation caused by connecting a subsea load to the power supply. In other aspects of the invention are disclosed: a subsea distribution bus including the temporary load device; a method; and a computer program for carrying out the method.