The penetration of alternating magnetic flux in wire ropes

When a wire rope is arranged in a laminated magnet yoke and magnetized by alternating current in accordance with the arrangement of magnetic circuit which has been described in a previous paper, ¿it is of importance to know how the magnetic flux becomes distributed across the section of the rope. In order to obtain some experimental data on this question, a sample of wire rope was constructed with a built-in search coil surrouniding each layer. By an examination of the oscillograms obtained from these search coils the flux density has been obtained for each layer of the rope for two values of the a.c. supply frequency. By means of ballistic tests the flux density has also been obtained for each layer when the wire rope is magnetized by direct current.