Heat from the losses inside an enclosed electric motor is properly dissipated into ambient air through the outer surface of the housing. In closed motors, this dissipation is usually assisted by the fan designed on the motor shaft itself. Favorable dissipation varies according to the efficiency of the ventilation system of the total dissipation area of the housing, the temperature difference between the outer surface of the housing and ambient air.
The required power supplied by the motor at the shaft tip is less than the power the motor absorbs from the power line. The difference between the two powers refers to the losses transformed into heat, which heats the winding, needing to be dissipated to the external environment of the engine spherical roller skf, in order to avoid that the temperature rise is excessive. The same thing happens in all other types of engines. In a car engine, for example, the heat generated by internal losses must be removed from the block by the water circulation system with the radiator or even by the fan in the case of air cooled engines.