Induction

Inductive heating is based on the supply of energy by means of electromagnetic induction. A coil, suitably dimensioned, placed close to the metal parts to be heated, being run through by high and medium frequency alternated current, induces on these parts parasitic currents whose intensity can be controlled and modulated. The heating occurs without physical contact, it involves only the metal parts to be treated and it is characterised by a high efficiency transfer without loss of heat.

The deepness of penetration of the generated currents is directly correlated to the working frequency of the generator used; higher it is, much more the induced currents concentrate on the surface. In this case, the heating homogeneity on a relevant mass, can be obtained only thanks to the principle of thermal conduction which allows the heating to be transferred in depth.

Decreasing the working frequency, it is possible to increase the penetration of the induced currents which are able to reach the very heart of the mass. The above mentioned phenomenon is strictly connected to the magnetic permeability and endurance of the material under treatment.

The phenomenon of the electromagnetic induction is therefore based on three physical principles, here below explained:

• Transfer of energy from the inductor to the mass to be heated, by means of electromagnetic fields

• Transformation of the electric energy into heat due to Joule effect

• Transmission of the heat inside the mass by means of thermal conduction