Patents Assigned to Asea Aktiebolag
  • Cylindrical furnace for treating materials at high temperatures and pressures
    Patent number: 4325694
    Abstract: A furnace for isostatic hot pressing includes a furnace compartment contained within a pressure chamber, the compartment being surrounded by a insulating sheath, comprising a cup-shaped insulating portion. Such portion comprises a supporting tube of graphite surrounded by a plurality of layers of carbon or of graphite fibers. Convection-preventing layers of graphite foils are disposed between the layers and between the innermost layer and the tube. The layers are maintained pressured against the tube and against one another by a plurality of surrounding graphite strands. A plurality of cover discs of foamed graphite having graphite foils on one side thereof are seated against upper ends of the layers and of the tube, the foils on the discs extending upwardly to lie against the peripheral end walls of the discs.
    Type: Grant
    Filed: November 24, 1980
    Date of Patent: April 20, 1982
    Assignee: ASEA Aktiebolag
    Inventor: Carl Bergman
  • DC Arc furnace hearth construction
    Patent number: 4324943
    Abstract: A DC arc furnace hearth is formed by brickwork having electric conductors extending through it, the conductors at their bottoms connecting with an electrically conductive layer on which the brickwork is layed and having top ends contacted by a melt contained by the brickwork. Arcing power can be transmitted via the conductive layer and conductors to the melt.
    Type: Grant
    Filed: June 23, 1980
    Date of Patent: April 13, 1982
    Assignee: ASEA Aktiebolag
    Inventors: Sven-Einar Stenkvist, Bo Rappinger
  • Transformer or reactor having a winding formed from sheet material
    Patent number: 4323870
    Abstract: To reduce the ohmic losses in a sheet-wound transformer or reactor winding, edge regions of at least some of the turns of the conductor sheet forming the winding are located at a different distance from the geometric axis of the winding compared with the distance from said axis of a central conductor portion in a respective one of said turns. Preferably the conductor sheet in each turn substantially follows the flux lines for the resultant magnetic leakage flux which corresponds to a constant current density in the sheet. For example, the winding may be wound from a metallic foil whose edge regions are folded back on themselves, or end regions of the winding may be provided with inter-turn packings (e.g. of tape) to achieve the desired flared shape of the turns at the ends of the winding.
    Type: Grant
    Filed: August 11, 1980
    Date of Patent: April 6, 1982
    Assignee: ASEA Aktiebolag
    Inventors: Bertil Moritz, Ole Tonnesen
  • Circuit breaker with means for producing a flow of arc-extinguishing gas
    Patent number: 4322591
    Abstract: A puffer type circuit breaker is provided with a pump means consisting of a piston and a cylinder for producing a blast of arc-extinguishing gas. The piston is axially displaceable against a spring force, and the cylinder is joined to the movable contact of the circuit breaker and arranged, during a breaking operation, to compress the gas in the cylinder space of the pump means to achieve a blast of extinguishing gas towards the contact area. A spring holds the piston pressed against a stop in the closed as well as the open position of the circuit breaker. The spring has such a high pre-stress that the piston only moves upon breaking of short-circuit currents.
    Type: Grant
    Filed: May 12, 1980
    Date of Patent: March 30, 1982
    Assignee: ASEA Aktiebolag
    Inventors: Erik Andersson, Carl E. Solver
  • Suspension-mounted static electrical converter
    Patent number: 4318169
    Abstract: A static electrical converter, preferably for high voltage, has at least one valve assembly each having a single valve or a plurality of electrically series-connected valves. The valve assembly is provided with suspension members at its upper end, so that the valve assembly can be suspended from a supporting structure.
    Type: Grant
    Filed: March 19, 1980
    Date of Patent: March 2, 1982
    Assignee: Asea Aktiebolag
    Inventor: Karl E. Olsson
  • Rotary AC machine stator with pressure hose supported coil ends
    Patent number: 4318021
    Abstract: The invention relates to a stator (1), the coil ends (5+6) of which are supported by means of at least one pressure hose (12, 13, 14) arranged along the circumference of the stator, said pressure hose running zig-zag between radially outer (8) and radially inner (9) surfaces of the coil ends (5+6).
    Type: Grant
    Filed: December 3, 1979
    Date of Patent: March 2, 1982
    Assignee: ASEA Aktiebolag
    Inventors: Sven Johansson, Roland Kolsmyr, Kristian D. Madsen, Esko Polvi
  • Electrical inverter with controllable output voltage
    Patent number: 4318167
    Abstract: An electrical inverter with controllable output voltage comprises a three-phase self-commutated inverter bridge which is supplied from a d.c. voltage source. A reference signal generator generates a three-phase binary reference signal for controlling the shape of the curve of the output voltage of the inverter. This signal is modulated or mixed in a mixing stage with a binary pulse train having a controllable pulse-width ratio and a relatively high frequency. The output signal from the mixing stage is supplied to the inverter bridge in such a way that the output voltage of the inverter bridge corresponds to the product of the reference signal and the pulse train.
    Type: Grant
    Filed: January 22, 1980
    Date of Patent: March 2, 1982
    Assignee: Asea Aktiebolag
    Inventor: Lennart Angquist
  • Measuring device with optical signal transmission
    Patent number: 4316141
    Abstract: The invention relates to a measuring device having a transmitter side and a receiver side, arranged for signal transmission from the transmitter side to the receiver side via an optical connection. The transmitter side comprises members for combining an incoming measuring signal with a signal from a reference voltage source to two different signals, arranged to be transmitted to the receiver side via each of two parallel optical channels. The receiver side comprises means for receiving the two transmitted signals and for controlling the amplification in the signal paths with a view to obtaining compensation for variation of parameters included in the two channels and other elements in corresponding signal paths. In addition, the receiver side includes a device which, from the two transmitted signals, forms a signal (U.sub.ut) independent of the input measuring signal of the transmitter side.
    Type: Grant
    Filed: October 24, 1979
    Date of Patent: February 16, 1982
    Assignee: ASEA Aktiebolag
    Inventors: Morgan Adolfsson, Torgny Brogardh
  • Heating modules for billets in inductive heating furnaces
    Patent number: 4315124
    Abstract: An inductive billet heating apparatus in an inductive heating furnace for billets of rectangular section uses a plurality of paired heater modules having a flat shape. The billets are fed by a plurality of paired roller elements and each heater module in each pair of heater modules is suspended from respective ones of the paired roller elements on opposite sides of the billet such that a substantially constant distance from the opposite surfaces of the billets to the respective heater modules is independent of the thickness and/or straightness of the billets. At least some of the heater modules may be mounted to be rotatable in a plane parallel to the respective surfaces of the billets. The heater modules may be series-connected in pairs and the paired heater modules either series-connected or parallel-connected in groups.
    Type: Grant
    Filed: November 9, 1978
    Date of Patent: February 9, 1982
    Assignee: ASEA Aktiebolag
    Inventors: Staffan Granstrom, Gosta Karlsson
  • Fiber optical temperature measurement devices
    Patent number: 4313344
    Abstract: The invention relates to a fiber optical temperature measuring device of the pyrometer type, comprising a transducer section and an electronic section, which are mutually interconnected by at least one optical fiber. The electronic section includes at least one light source and the light therefrom is arranged to be emitted via the optical fiber to the transducer, and in the transducer at least part of the light is reflected back into the fiber and is conducted through the optical fiber together with an output measuring signal from the transducer to one or more detectors included in the electronic section.
    Type: Grant
    Filed: November 30, 1979
    Date of Patent: February 2, 1982
    Assignee: Asea Aktiebolag
    Inventors: Torgny Brogardh, Lars Sander
  • Wheels having hard particles distributed in metallic tread
    Patent number: 4310191
    Abstract: The present invention relates to railbound vehicles equipped with wheels which include a rail-contacting wear layer made of a metallic material which has evenly distributed therein hard particles, such as carbides, oxides, borides or nitrides, for increasing the frictional characteristics of the wheel.
    Type: Grant
    Filed: January 8, 1979
    Date of Patent: January 12, 1982
    Assignee: ASEA Aktiebolag
    Inventor: Henry Halldin
  • Bushing for electrical leads
    Patent number: 4309568
    Abstract: An electrical bushing is provided to facilitate the passage of electrical conductor leads from thermocouples or the like through a pressure barrier. The bushing includes a casing and a deformable, resilient, elastic plug which is disposed in a central conductor receiving bore of the casing in surrounding relationship to the conductors. Thus, when the plug is compressed in a direction axially of the casing, the plug tends to expand laterally radially and into sealing contact with the internal surfaces of the bore and with the electrical conductors.
    Type: Grant
    Filed: December 29, 1977
    Date of Patent: January 5, 1982
    Assignee: ASEA Aktiebolag
    Inventor: Sven-Erik Isaksson
  • Apparatus for application of a tape of material in longitudinal direction of a substantially rectangular electrical conductor
    Patent number: 4309231
    Abstract: A tape of insulating material, provided with a binder, is fixed to an elongated, rectangular electrical conductor in a longitudinal direction thereof, the tape being brought into contact with a first side of the conductor before the other portions of the tape are folded around the conductor with the use of endless belts movable transversely to the longitudinal direction of the conductor for bringing the other portions of the tape in contact with at least two other adjacent sides of the conductor.
    Type: Grant
    Filed: August 26, 1980
    Date of Patent: January 5, 1982
    Assignee: ASEA Aktiebolag
    Inventors: Gunnar Borgstrom, Bengt Rothman
  • Electrical circuit module with sequentially actuated contact apparatus
    Patent number: 4305633
    Abstract: An electrical circuit module having sequentially actuated contact apparatus comprises at least two multiple contact devices (10, 11), each intended to be connected to a fixed contact device in an associated support frame, one of the multiple contact devices (11) having a larger play in the insertion direction relative to the module support plate (13), than does any other multiple contact device (FIG. 2).
    Type: Grant
    Filed: October 24, 1979
    Date of Patent: December 15, 1981
    Assignee: ASEA Aktiebolag
    Inventors: Kjell Engberg, Bjorn Ericson
  • Multiphase fault protection circuitry with variable functional level detection
    Patent number: 4296452
    Abstract: In circuitry for generating tripping and blocking signals for the protection of electrical components in an electrical power supply network as a result of the occurrence of faults therein, respective tripping and blocking outputs for each phase of an electrical power supply network are generated such that double or triple pole tripping is prevented unless the presence of an actual second tripping signal is detected subsequent to the detection of a first tripping signal. The respective tripping signals and blocking signals for each phase of the electrical power supply network are generated in dependence on whether the fault lies ahead or behind the electrical component to be protected, respectively, in response to measurement of the voltage and current associated with transient waves generated by faults in each electrical power supply network phase.
    Type: Grant
    Filed: June 1, 1979
    Date of Patent: October 20, 1981
    Assignee: Asea Aktiebolag
    Inventors: Leif Eriksson, Salomon Liberman
  • Structure for preventing winding collapse
    Patent number: 4296395
    Abstract: Certain windings in a transformer are subjected to radially inwardly-directed forces while being short-circuited. If such a winding is not sufficiently stable itself, particularly with respect to tape windings, or does not have sufficient support radially outwardly or inwardly, it will buckle or break. To prevent such an occurrence, it is possible to arrange an outward support around the winding by completely or partly filling up the space between the winding, which is subjected to buckling stress, and a second winding positioned outside the first winding. Additionally, there is required an inner supporting cylinder, which is preferably made of metal, so that it can be made relatively thin.
    Type: Grant
    Filed: November 2, 1979
    Date of Patent: October 20, 1981
    Assignee: ASEA Aktiebolag
    Inventor: Bertil Moritz
  • Sheet-wound transformer or reactor
    Patent number: 4295113
    Abstract: In a transformer or a reactor having at least one winding of foil-formed electrical conductor material, a magnetic-flux-controlling spirally-wound sheet of highly permeable ferro-magnetic material is arranged axially outside each end of the winding. The ends of the sheet are galvanically connected to the foil winding. By division of the magnetic material in the sheet, a high resistance in the longitudinal direction of the sheet, and thus lower losses, are obtained.
    Type: Grant
    Filed: August 11, 1980
    Date of Patent: October 13, 1981
    Assignee: Asea Aktiebolag
    Inventors: Anders Bjorklund, Erik Persson, Lars-Goran Virsberg
  • Method for containing spent nuclear fuel rods in a protective container to facilitate disposal
    Patent number: 4293773
    Abstract: Disclosed is a method for preventing the scattering of radioactive material in spent nuclear fuel rods into the environment. The method comprises placing one or more of the spent fuel rods within a casing of ductile material, sealing the casing gas-tight, bending the casing so that its largest dimension is reduced, and placing a number of the bent casings within a protective container.
    Type: Grant
    Filed: May 8, 1978
    Date of Patent: October 6, 1981
    Assignee: ASEA Aktiebolag
    Inventor: Jan Lundren
  • Method for generating a pattern by means of an industrial robot and industrial robot for carrying out the method
    Patent number: 4287459
    Abstract: An industrial robot (1-10) is arranged to position workpieces (OP) in a unidimensional or multidimensional pattern or to collect workpieces located in such a pattern. The robot is first controlled to a predetermined preliminary position (e.g. P'.sub.O) and thereafter to its final position in the pattern by way of sensing members (9). The preliminary position for a workpiece is calculated with the final position of an adjacent workpiece as the starting point. To this position is added a vector corresponding to the spacing of the pattern. The spacing is calculated as the difference between the coordinates for the final positions of two workpieces located adjacent to the workpiece in question.
    Type: Grant
    Filed: November 6, 1979
    Date of Patent: September 1, 1981
    Assignee: ASEA Aktiebolag
    Inventor: Lars Dahlstrom
  • Powder manufacturing apparatus
    Patent number: 4284393
    Abstract: Apparatus for manufacturing powder, especially metallic powder, by a melt atomization process, comprises a closed container in which a jet of gas is directed transversely into a stream of the melt and breaks it down into droplets which rapidly solidify and are thrown in a parabolic trajectory to the lower part of the container. In the lower part of the container there is an inclined bottom or a shaking table on which the powder flows to an outlet opening. Means are provided for withdrawing gas from the container, cooling it and re-introducing it into the lower part of the container where it is forced by guide means to flow in contact with the powder flowing to the outlet opening. The flow direction of this re-introduced gas is substantially opposite to the direction of flow of the powder to the outlet opening, so that it has an efficient cooling effect on the powder.
    Type: Grant
    Filed: May 19, 1980
    Date of Patent: August 18, 1981
    Assignee: ASEA Aktiebolag
    Inventors: Gunnar Brunosson, Hans-Gunnar Larsson, Erik Westman