Induction Heating Coffee Roasting Machine. Induction heating is achieved through a coil placed outside the container cylinder of the roasting chamber, induced currents in the drum created by the Joule effect power heat in the drum itself, which in turn transfers heat to the rotating drum by radiation and convection Heating of the rotating drum is deliberately indirect to avoid overheating of the rotating drum called the coil conformed in such a way as to allow the entry of a flow of air from below for the extraction of volatile products that are produced during the roasting process and escape from above An insulating layer is placed on the outside of the container drum to the protection of the induction coil Power control over the coil is achieved by referring to the temperature of the air inside the drum rotating and detected utilizing a thermocouple placed inside the rotating drum and placing a limit on the maximum temperature of the outer cylinder detected through the thermocouple The airflow is regulated utilizing a regulating valve of the exhaust airflow It is controlled according to the error of the temperature inside referred to as the thermocouple