Abstract: Disclosed is an induction furnace with improved circulation of the molten metal. The increased circulation and is achieved by positioning the greatest magnetic field strength in a location above one or more of the channel vertical legs. This arrangement is achieved by (a) using an angled core to position the field over the upper channel opening or (b) by positioning the upper channel leg opening by lowering the channel opening to within the magnetic core window.

Abstract: The specification discloses a computerized monitor for a coreless induction furnace. The monitor includes a first potential transformer connected across the coil and a second potential transformer connected between one end of the coil and an electric ground. The relative location of a ground fault along the length of the coil is approximated by computing the ratio of the transformer outputs. An impedance variation look-up table is included to provide correction factors for the approximated location to compensate for variations in impedance along the length of the coil. The monitor further includes a first current transformer in the coil power line and a second current transformer in the melt bath ground. Internal ground faults are detected by computing the phase difference between the coil and ground currents. A graphic representation of the furnace is also generated to illustrate the location of the ground fault with respect to turns and yokes of the coil.

Abstract: The specification discloses a computerized monitor for a coreless induction furnace. The monitor includes a first potential transformer connected across the coil and a second potential transformer connected between one end of the coil and an electric ground. The relative location of a ground fault along the length of the coil is determined by computing the ratio of the transformer outputs. The monitor further includes a first current transformer in the coil power line and a second current transformer in the melt bath ground. Internal ground faults are detected by computing the phase difference between the coil and ground currents. A graphic representation of the furnace is also generated to illustrate the location of the ground fault with respect to turns and yokes of the coil. The monitor also calculates liner wear by determining melt bath volume, which is inversely proportional to melt bath resistance, which in turn is proportional to coil resistance.