Channel furnace for melting metals and alloys with a single inductor coil assuring the heating and forced circulation of the molten metal

摘要

A channel furnace for the melting of metals and alloys, of the kind comprising an inductor device for the heating and the unidirectional forced circulation of the molten metal in the channel. The inductor includes a single coil 10 formed of two layers of conductors wound along helices whose axial pitch is equal to the axial length of the coil for one half-turn of winding. The coil is divided into n pairs (n >/=3) of circuits of m turns each, regularly distributed over the periphery of the coil, the two circuits of each pair being derived one from the other by a rotation of 180 DEG about the axis of the coil and being series-connected together additively from the point of view of the axial component of the magnetic flux which they generate. The pairs are shifted in angle by 2 pi /n about the axis of the coil so as to form n phases shifted by 2 pi /n.