Through a contrary electrical source .change the three-phase alternating current into a single-phase DC ,and then invert into a medium frequency pulse AC of 500-1000HZ by inverter . then form a magnetic field through the copper spiral in the furnace .the form a magnetic filed through the copper furnace ,so that the furnace . the magnetic filed can make quantity of heat in the furnace ,so that the furnace can melt the metals.
It is widely used to melt and melt heat nonferrous metal , size :0.25T-3T