Electromagnetic brake system and method of controlling molten metal flow in a metal-making process
AssigneeABB Schweiz AG
InventorsAnders Lehman, Jan-Erik Eriksson, Martin Sedén
Life of this patent
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Abstract
A method of controlling molten metal flow and an electromagnetic brake system for a metal-making process, including: a first magnetic core arrangement having a first and second long sides with Nc teeth, and arranged to be mounted to opposite longitudinal sides of an upper portion of a mould, a first set of coils, each being wound around a respective tooth of the first magnetic core arrangement, and Np power converters, with Np being an integer that is at least two and Nc is an integer that is at least four and evenly divisible with Np, wherein each power converter is configured to feed a DC current to its respective group of 2Nc/Np series-connected coils.
Claims14
An electromagnetic brake system for a metal-making process, wherein the electromagnetic brake system comprises:
- a first magnetic core arrangement having a first long side and a second long side, which first long side has Nc teeth and which second long side has Nc teeth, wherein the first long side and the second long side are arranged to be mounted to opposite longitudinal sides of an upper portion of a mould,
- a first set of coils, wherein the first set of coils comprises 2Nc coils, each coil being wound around a respective tooth of the first magnetic core arrangement, and
- Np power converters, with Np being an integer that is at least two and Nc is an integer that is at least four and evenly divisible with Np,
- wherein each power converter is connected to a respective group of 2Nc/Np series-connected coils of the first set of coils, and wherein each of the 2NC coils receives DC current from its respective power converter, and
- wherein at least two coils of each group are wound around teeth of the first long side of the first magnetic core arrangement and at least two coils of each group are wound around teeth of the second long side of the first magnetic core arrangement.
A method of controlling molten metal flow in a metal-making process, by means of an electromagnetic brake system comprising a first magnetic core arrangement having a first long side and a second long side, the first long side has Nc teeth and the second long side has Nc teeth, wherein the first long side and the second long side are mounted to opposite longitudinal sides of an upper portion of a mould, in level with a submerged entry nozzle, SEN, a first set of coils, wherein the first set of coils comprises 2Nc coils, each coil being wound around a respective tooth of the first magnetic core arrangement, and Np power converters, with Np being an integer that is at least two and Nc is an integer that is at least four and evenly divisible with Np, wherein each power converter is connected to a respective group of 2Nc/Np series-connected coils of the first set of coils, and wherein each of the 2NC coils receives DC current from its respective power converter, wherein the method comprises controlling the Np power converters to obtain braking of the molten metal in the upper portion of the mould and wherein at least two coils of each group are wound around teeth of the first long side of the first magnetic core arrangement and at least two coils of each group are wound around teeth of the second long side of the first magnetic core arrangement.
An electromagnetic brake system for a metal-making process, wherein the electromagnetic brake system comprises:
- a first magnetic core arrangement having a first long side and a second long side, which first long side has Nc teeth and which second long side has Nc teeth, wherein the first long side and the second long side are arranged to be mounted to opposite longitudinal sides of an upper portion of a mould,
- a first set of coils, wherein the first set of coils comprises 2Nc coils, each coil being wound around a respective tooth of the first magnetic core arrangement,
- Np DC power converters, with Np being an integer that is at least two and Nc is an integer that is at least four and evenly divisible with Np,
- wherein each power converter is connected to a respective group of 2Nc/Np series-connected coils of the first set of coils, wherein each of the 2NC coils receives only DC current from their respective power converter,
- wherein at least two coils of each group are wound around teeth of the first long side of the first magnetic core arrangement and at least two coils of each group are wound around teeth of the second long side of the first magnetic core arrangement;
- and
- wherein each DC power converter has an individually selected amplitude and polarity of DC current sent to its respective group of coils.
Dependencies are inferred from the claim text.