Numerical and experimental analysis of heat dissipation intensification from electric motor

In this paper, three ways of heat dissipation improvement from the electric motor windings have been investigated. The average winding temperatures that were measured during experiments in the reference state at the nominal rate and no heat removal enhancement reached the temperature values of 68 K above the room temperature. The first variant of heat dissipation improvement was based on covering the external surfaces of the machine by high emissivity material that allowed to decrease the temperature of the windings of approx. 4 K. The second variant was based on the application of two types of radiators on the external motor surfaces. The effect of this solution was the winding temperature reduction of 9 K in case of the first applied radiator and 16 K in case of the second radiator referring both to the rise above the ambient temperature and comparing to the case before modifications. In the next variant, an application of the thermal filler within the motor casing in the free space of the stator allowed to decrease the average windings temperature by 18 K. Then this motor configuration was equipped with the bigger radiator that allowed to reduce the temperature of approx. 30 K. (C) 2019 Published by Elsevier Ltd.