Patents by Inventor Magnus Hallefält

Magnus Hallefält has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6668626
    Abstract: A system and a method for measuring and determining flatness of a strip (1) of rolled material. Said system is comprising a measuring roll (2) having a cylindrical central structure (41) having a number of measuring devices for force/pressure registration. Said devices is generating measurement output signals (Upi) depending on the contact between the strip and the measuring roll (2), wherein said measurement output signal (Upi) comprises a force component signal (UFi). Said system also comprises a Flatness Determination Unit (56), said unit being arranged for calculating the flatness (&Dgr;&sgr;1) of the strip based exclusively on signals derived from measurement output signal (Upi) values generated by said measuring devices and information about the values of the width and thickness of the strip (1). The system is continuously determining the Wrap Angle (&agr;) from at least one measurement output signal (Upi) and automatically compensating for a changing Wrap Angle (&agr;).
    Type: Grant
    Filed: February 27, 2002
    Date of Patent: December 30, 2003
    Assignee: ABB AB
    Inventors: Kenneth Grefve, Jörgen Bosson, Magnus Hallefält, Lars Jonsson
  • Patent number: 6332493
    Abstract: A chill mold for the simultaneous casting of two parallel strands and a magnetic brake which generates at least one static or periodic low frequency magnetic field. The chill mold includes a rectangular casting mold and an inner partition which subdivides the rectangular casting mold into two sub-molds, and the magnetic field acts with essentially the same magnetic field direction across the entire width of the rectangular casting mold and has an essentially symmetrical distribution in both sub-molds. The brake includes a first magnet at a first long side of the rectangular casting mold and a second magnet of opposite polarity at the opposite second long side of the rectangular casting mold. The magnetic material in the first and second magnets is distributed such that both magnets have two magnetic sub-poles of the same polarity arranged adjacent to each other along each of the two long-sides of the rectangular casting mold.
    Type: Grant
    Filed: October 18, 1999
    Date of Patent: December 25, 2001
    Assignee: ABB AB
    Inventors: Magnus Hallefält, Conny Svahn, Erik Svensson
  • 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