Medium frequency induction melting furnace is mainly composed of power supply, induction coil, crucible made of refractory materials in the induction coil. The crucibles contains metal charge, which is equivalent to the secondary winding of transformer. when induction coil is connected to the AC power supply, an alternating magnetic field is generated in the induction coil, its magnetic line cuts the metal charge in the crucible, and an induced electromotive force is generated in the charge. Since charges itself forms a closed loop, the secondary winding is characterized by only one turn is closed. Therefore, Induced current is generated in the charge at the same time, when induced current passes through the charges, the charges is heated to promote its melting.

Medium frequency induction melting furnace uses an medium frequency power supply to establish an medium frequency magnetic field, which induces eddy currents and heat generation in the ferromagnetic material to achieve the purpose of heating material.