Evaluation of an Evaporative Cooling Solution for Hybrid and Electrical Vehicles Motors
Résumé
Thermal management is one of the main issues to
design compact and high power electric motors for automotive
application. Evaporative cooling is already well used in electric
devices such as inverters. It appears as an interesting solution for
motors because it can evacuate large amount of energy with a low
temperature gradient. This paper deals with the benefits on
copper coil current density that an evaporative cooling method
can provide. To achieve this goal, tests are performed on wires
submerged into different 3M™ Novec™ fluids. The heat flux and
the current density behaviors are studied. Finally, the
possibilities of rising the motor current density to increase its
torque or to improve its efficiency and the use of evaporative
cooling in motors are discussed.