Patents Assigned to Asea Brown Boveri AB
  • Patent number: 7019429
    Abstract: A method for mounting a tube in a space having a shape corresponding to the shape of the tube. The tube is inserted into the space, pressurized with a hot pressure medium causing the tube to expand until the space is filled, then a cold pressure medium is substituted for the hot pressure medium while maintaining constant pressure causing the tube to solidify in its expanded shape. Also, a rotating electric machine having such a tube between windings of a high-voltage cable in a stator slot.
    Type: Grant
    Filed: November 27, 1998
    Date of Patent: March 28, 2006
    Assignee: Asea Brown Boveri AB
    Inventors: Bertil Larsson, Bengt Rothman
  • Publication number: 20050099258
    Abstract: A power transformer/inductor includes at least one winding. The winding is made of a high voltage cable that includes an electric conductor, and around the electric conductor is arranged a first semiconducting layer, around the first semiconducting layer is an insulating layer, and around the insulating layer is a second semiconducting layer. The second semiconducting layer is directly earthed at both ends of the winding and furthermore at least at two points per turn of every winding such that one or more points are indirectly earthed.
    Type: Application
    Filed: December 20, 2004
    Publication date: May 12, 2005
    Applicant: ASEA BROWN BOVERI AB
    Inventors: Udo Fromm, Sven Hornfeldt, Par Holmberg, Gunnar Kylander, Li Ming, Mats Leijon
  • Patent number: 6867674
    Abstract: A power transformer having at least one high voltage winding and one low voltage winding. Each of the windings includes at least one current-carrying conductor, a first layer having semiconducting properties provided around said conductor, a solid insulating layer provided around said first layer, and a second layer having semiconducting properties provided around said insulating layer. The windings are intermixed such that turns of the high voltage winding are mixed with turns of the low voltage winding.
    Type: Grant
    Filed: November 30, 1998
    Date of Patent: March 15, 2005
    Assignee: Asea Brown Boveri AB
    Inventors: Thorsten Schutte, Par Holmberg, Jan Brangefalt, Christian Sasse, Peter Carstensen
  • Patent number: 6828701
    Abstract: A synchronous machine for power and/or voltage control comprises a stator with a stator winding and a rotor with a field winding. The stator winding comprises a high-voltage cable with solid insulation. A rotor has a thermally based rotor current limit intersecting with a thermally based stator current limit in a capability graph at a power factor considerably below the rated power factor or has the thermally based rotor current limit above the thermally based stator current limit. In the capability graph. Means are provided for limiting the currents in order to avoid thermal damage. In a method for power and/or voltage control of such a synchronous machine, the machine operates with the stator current exceeding the thermally based stator current limit for a certain time period less than the maxim an permissible time limit, whereafter the overload is reduced by reduction of either the active power or the field current or a combination of both.
    Type: Grant
    Filed: October 4, 1999
    Date of Patent: December 7, 2004
    Assignee: Asea Brown Boveri AB
    Inventors: Bertil Berggren, Lars Gertmar, Jan-Anders Nygren, Tore Petersson, Mats Leijon
  • Patent number: 6577487
    Abstract: Connection arrangements are employed for reducing the effect of third-hannonic voltages in case of direct connection of AC machines to a three-phase distribution or transmission network, wherein the stator winding of the AC machine is Y-connected and wherein the neutral point of the winding is available. An exemplary embodiment employs a suppression filter turned to the third-harmonic, with an overvoltage protection device arranged between the neutral point and ground of the power network.
    Type: Grant
    Filed: November 27, 1998
    Date of Patent: June 10, 2003
    Assignee: Asea Brown Boveri AB
    Inventor: Lars Gertmar
  • Patent number: 6525265
    Abstract: A high voltage power cable termination with a current lead, a power cable having a first tube and an outer conductor, e.g., a superconductor, whose electrically conducting properties improve at low temperatures, arranged around the first tube and intended in use to be cooled to low temperatures by cryogenic fluid flowing through the first tube, a joint for electrically connecting one end of the current lead to the conductor at one end of the cable at or adjacent to one of the first tube, and a second tube communicating with the first tube at or adjacent to the joint for conveying cryogenic fluid to or from the first tube. The first and the second tube are arranged so that, in use, no cryogenic fluid conveyed by the tubes contacts the conductor or the current lead at the joint. The invention also relates to electrical apparatus, e.g., a high voltage induction device, having such a termination.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: February 25, 2003
    Assignee: Asea Brown Boveri AB
    Inventors: Mats Leijon, Christian Sasse
  • Patent number: 6396187
    Abstract: The present invention relates to a laminated magnetic core for rotating electric machines. The laminated magnetic core comprises a number of stack members (40), each consisting of a number of sheets of metal joined together. Each stack member (40) is provided with two identical grooves (42) arranged to cooperate with wedge members (46) designed to join the stack members (40). The cross-sectional area of the groove (42) is larger than the cross-sectional area of the wedge member (46) and the wedge member (46) has two protrusions arranged symmetrically in relation to the longitudinal axis of the wedge member. The groove (42) has at least one part shaped to fit said protrusion. The stack members (40) in the laminated magnetic core are stacked on and partially overlapping each other to form different layers of stack members (40).
    Type: Grant
    Filed: June 18, 1999
    Date of Patent: May 28, 2002
    Assignee: Asea Brown Boveri AB
    Inventor: Bengt Rothman
  • Patent number: 6324483
    Abstract: An angular acceleration transducer measures angular acceleration of a torque-transmitting shaft of a drive device, and includes a measuring shaft having a torque transducer and a transducer flywheel, and which is connected to the torque-transmitting shaft in such a way that it follows rotational movement of the torque-transmitting shaft with a known ratio.
    Type: Grant
    Filed: June 16, 1999
    Date of Patent: November 27, 2001
    Assignee: Asea Brown Boveri AB
    Inventor: Jarl Sobel
  • Patent number: 6261437
    Abstract: An anode, process for anodizing, an anodized wire and electric device having an anodized wire for use in high-voltage electric machines. A predetermined length of metallic conductor wire is wound around a holder, where respective windings are separated from one another with guide cams and guide slots. The metallic conductor wire and holder are then disposed in an electrolyte, where both ends of the metallic conductor wire are connected to a positive pole on a current source so as to implement the anodization operation. An oxide layer is formed as a result of the anodizing operation on a metallic portion of the metallic conductor wire. Properties of the oxide layer are such that the electrical insulation properties and adherence of the oxide layer to the wire are suitable for use in windings of electric machines for high-voltage applications.
    Type: Grant
    Filed: July 1, 1999
    Date of Patent: July 17, 2001
    Assignee: Asea Brown Boveri AB
    Inventors: Bo Hernnaes, Hans-Olof Kalldin, Torbjorn Imrell
  • Patent number: 6253832
    Abstract: A device, for continuously or semicontinuously casting of metal in a casting mould, for braking and splitting up a primary flow of hot melt supplied to a casting mould, and controlling the flow of melt in the non-solidified portions of a cast strand which is formed in the casting mould. The device comprises a plurality of water box beams which support and cool the casting mould and supply a coolant to the casting mould, and a magnetic brake. The magnetic brake is adapted to generate at least one static or periodic low-frequency magnetic field to act in the path of the inflowing melt and comprises at least one magnet to generate the magnetic field, at least one core to transmit the magnetic field to the casting mould and a cast strand, and at least one magnetic return path to close the magnetic circuit. The water box beam is completely or partially arranged in a magnetically conducting material.
    Type: Grant
    Filed: July 27, 1998
    Date of Patent: July 3, 2001
    Assignee: Asea Brown Boveri AB
    Inventor: Magnus Hallefält
  • Patent number: 6244038
    Abstract: A combustion plant for a combustion process is disclosed. The plant has a pressurized combustion chamber (1), which encloses a fluidized bed and in which combustion of a fuel is to take place while producing combination gases, a gasifying device (40), which is arranged to produce a combustible gas and a degassed combustible product, and a transportation device (6, 44) for discharging the product from the gasifying device (40) and supplying it to the combustion chamber (1) for combustion of the product in the combustion chamber. The transportation device has a discharge conduit (44) connected to the gasifying device (40) and is arranged to discharge the product from the gasifying device (40). The discharge conduit (44) has a cooling member (45), which is arranged to cool the product discharged from the gasifying device (40), and a pneumatic supply conduit device.
    Type: Grant
    Filed: April 29, 1999
    Date of Patent: June 12, 2001
    Assignee: Asea Brown Boveri AB
    Inventors: Roine Brännström, Anders Lövgren, Dirk Veenhuizen
  • Patent number: 6242688
    Abstract: A sea electrode (15) for grounding of a high voltage direct current transmission system comprises an electrically conducting electrode body (1) for connection to the transmission system and at least one ballast (4) located above the electrode. The electrode further comprises a layer (5) of an electrically non-conducting material, located above the electrode body and extending over it, so as to influence the maximum electrical field strength not to exceed a desired level at a point (P) at the edge of the non-conducting layer and thereby also in the sea water outside a zone (35) located below the non-conducting layer and in a vertical direction limited by the edge of the non-conducting layer.
    Type: Grant
    Filed: June 21, 1999
    Date of Patent: June 5, 2001
    Assignee: Asea Brown Boveri AB
    Inventors: Yuri Iossel, Grigory Kazarov, Veijo Koski, Alexey Poliakov, Heiko Gebhardt
  • Patent number: 6239514
    Abstract: An electric switching device comprises a quick mechanical electric switch and an irradiation source and at least one switching element sensitive to irradiation and adapted to create an electrically well conducting current path by-passing the electric mechanical switch upon irradiation thereon through the irradiation source, but assuming an electrically insulating state in absence of irradiation thereon. The quick mechanical electric switch is capable of being quickly de-ionized after extinction of an electric arc created therein upon separation of the contacts of the mechanical switch.
    Type: Grant
    Filed: December 14, 1998
    Date of Patent: May 29, 2001
    Assignee: Asea Brown Boveri AB
    Inventors: Jan Isberg, Hans Bernhoff, Per Skytt, Pan Min
  • Patent number: 6236198
    Abstract: A method and a device for non-contacting measurement of the measures and position of objects of electrically conductive materials based on electromagnetic induction is provided. A measuring object, a transmitter coil and a receiver coil are placed in relation to each other such that a time-varying magnetic field generated by the transmitter coil at a measuring region of the measuring object is substantially parallel to the surface of the measuring region. The receiver coil is placed such that a conceived field line which touches the measuring region in its extension reaches the receiver coil. On the basis of the voltage induced in the receiver coil, the position and dimensions of the measuring region relative to a given reference point can be calculated.
    Type: Grant
    Filed: May 28, 1998
    Date of Patent: May 22, 2001
    Assignee: Asea Brown Boveri AB
    Inventor: Sten Linder
  • Patent number: 6230859
    Abstract: A device for holding and guiding a cable assembly (11) between a first manipulator part (2) and a second manipulator part (3), which is movable in relation to the first part. The device comprises a cable assembly carrier (17) which is attached to the first manipulator part and which is elongated and tubular and that the cable assembly runs longitudinally through the cable assembly carrier. From an initial position, the movement of the cable assembly is influenced by a returning force.
    Type: Grant
    Filed: June 10, 1999
    Date of Patent: May 15, 2001
    Assignee: Asea Brown Boveri AB
    Inventor: Stefan Springmann
  • Patent number: 6232865
    Abstract: A tubular core (6) for a controllable inductor with a main winding (1) surrounding the core and a control winding (7) passing substantially axially through the core. The core (6) is capable of receiving a magnetic flux from the main winding (1) running substantially axially therethrough and having a plurality of core rings (8) stacked co-axially on top of each other and connected to a rigid unit. The core rings (8) are connected to each other forming a walled construction. The core (6) also has an inner envelope (18) with an outer cross-section that is substantially equal to the inner cross-section of the core ring walled construction. The walled construction has joints (16) between the core rings (8) in an axial direction which are overlapped by a part of the envelope (18).
    Type: Grant
    Filed: July 18, 1997
    Date of Patent: May 15, 2001
    Assignee: Asea Brown Boveri AB
    Inventors: Gunnar Zinders, Tommy Holmgren, Björn Sandin, Stefan Valdemarsson, Dan Elofsson, Olle Ekwall
  • Patent number: 6230079
    Abstract: A method for control of an industrial robot, which has a plurality of movement axes with a position sensor for each of said axes which is adapted to deliver an output signal which defines the current position of the axis, and a control system for control of the axes of the robot. Continuously during operation of the robot for at least one mechanically critical point (i) of the robot, the relevant load (&tgr;i) during a predetermined period of time (&Dgr;t) is calculated on the basis of the output signals (&phgr;1,&phgr;2 . . . &phgr;6) from the position sensors and a mathematical model of the robot.
    Type: Grant
    Filed: June 9, 1998
    Date of Patent: May 8, 2001
    Assignee: Asea Brown Boveri AB
    Inventors: Torgny Brogårdh, Håkan Dahlquist, Staffan Elfving, Tord Henriksson
  • Patent number: 6226565
    Abstract: A method for control of the movement of the movement of an industrial robot along a given track (P1-P4) with a desired track speed (v), which industrial robot has a number of movement axes and for each axis servo equipment for control of the axis movement in accordance with reference values ({overscore (&tgr;)}korr) supplied thereto. First, those axis angles ({overscore (&phgr;)}i) which are needed for assuming the next position on the track are calculated. In dependence on the calculated axis angles and a first mathematical model, which describes the static and dynamic properties of the robot, for each one of the movement axes that torque ({overscore (&tgr;)}=(&tgr;1, &tgr;2 . . . &tgr;6)) is calculated which is required for assuming the next position. The load (t) is calculated at one or more mechanically critical points for the calculated axis angles ({overscore (&phgr;)}i) with the aid of a second mathematical model, which describes the load of the robot at the critical points.
    Type: Grant
    Filed: July 10, 1998
    Date of Patent: May 1, 2001
    Assignee: Asea Brown Boveri AB
    Inventors: Staffan Elfving, John-Erik Snell
  • Patent number: 6226163
    Abstract: This invention is related to a device and a method in an electric power plant for protection of an object (1) against over-currents from a network (3) or another equipment included in the high voltage plant, the device comprising a switching device (4) in a line (2) between the object and the network/equipment. The line (2) between the object and the network/equipment is connected to an arrangement (5) reducing over-currents towards the object (1), said arrangement (5) being actuatable for over-current reduction with the assistance of an over-current condition detecting arrangement (11-13) within a time period substantially less than the break-time of the switching device (4).
    Type: Grant
    Filed: March 2, 1998
    Date of Patent: May 1, 2001
    Assignee: Asea Brown Boveri AB
    Inventors: Hans Bernhoff, Mikael Bergkvist, Mats Ekberg, Jan Isberg, Mats Leijon, Li Ming, Anders Sunesson, Dan Windmar, Bertil Berggren
  • Patent number: 6222141
    Abstract: A switch comprises at least a first layer of a first material and two contact electrodes arranged on opposite sides of the first layer and connectable to different potentials for applying a voltage thereacross. A first layer is adapted to be conducting upon applying a voltage across the contact electrodes when exposed to irradiation through an irradiation source of an energy high enough for lifting charge carriers from the valence band to the conduction band of the first material. The contact electrode arranged on the first side of the first layer is laterally displaced with respect to the contact electrode arranged on the opposite second side of the layer with a lateral distance separating them.
    Type: Grant
    Filed: December 31, 1998
    Date of Patent: April 24, 2001
    Assignee: Asea Brown Boveri AB
    Inventors: Erik Johansson, Per Skytt