Importance

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Abstract

An electromagnetic drag pad, particularly for providing all the drag force needed where slit ferrous strip is to be coiled at a coiling station, comprises a panel of drag friction material covering pole faces of an electromagnet which magnetically attracts the moving ferrous strip into frictional engagement with the panel of drag friction material thereby establishing a back tension to permit satisfactory formation of a stable coil of each strip at a coiling station; the electromagnet has a core comprising a multiplicity of elongated spaced apart substantially parallel pole elements defining therebetween gaps which accommodate an electric winding which is connected to a power supply (such as a low voltage DC high amperage supply) for energizing the electromagnet, the pole elements having respective pole faces which provide an alternating array of north and south poles. Typically, the pole elements extend transversely to the strip and these are of the order of 100 pole elements arranged in the array which extends of the order of 1 meter along the direction in which the strips move. The new form of electromagnet disclosed may have other applications.

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First Claim