Cooling system and cooling method

A method of cooling an electromagnetic induction device, wherein:

• the electromagnetic induction device includes:
• at least one duct filled with a first coolant and surrounded by a second coolant, each being routed along a direction of natural convection;
• at least one group of fans, each fan of the at least one group of fans being mounted along a respective duct of the at least one duct along the direction of natural convection and being configured to blow for the-second-coolant-forced cooling;
• at least one group of electric motors, each electric motor being configured to operate a respective fan of the at least one group of fans;
• at least one group of switches, each switch being configured to control a respective electric motor of the at least one group of electric motors;
• and the method including:
• obtaining at least one group of data sets, each data set representing a parameter associated with a respective fan of the at least one group of fans, wherein the parameter concerns a level of the respective fan along the direction of natural convection;
• obtaining criteria for cooling rate optimization of the cooling system based on operating temperatures of the electromagnetic induction device with different fan combinations activated with a cooling rate of each of the different fan combinations stored in a database;
• in consideration of the parameter obtained, through knowledge-based predetermined numerical and/or logical linkages and cooling rates stored for the different fan combinations, selecting a minimum number of fans in the at least one group of fans to blow for the-second-coolant-forced cooling to supply a predetermined amount of cooling capacity according to criteria obtained for cooling rate optimization of the cooling system to thereby minimize power consumption of the at least one group of fans;
• and
• individually controlling each switch to thereby obtain individual control of each fan.