the last race, we had two external sensors reading the outside
temperature of the aluminum water pipe (marked A and B). We
also recorded the temperatures from inside the motors and
coolant is picking up about 5 degrees Celsius in each motor.
The coolant starts at air temperature (around 30 Celsius)
and reaches 50 Celsius at the end of the race. The motor windings
reach 176 Celsius. The inverters reach 64 Celsius.
radiator was able to drop the coolant temperature about 10
degrees Celsius (sensors out of and into the radiator at points
C and D respectively). We found that the coolant temperature
rose steadily during the race which indicates that the system
was absorbing more heat than the radiator was able to dump.
we need to increase cooling by the radiator. We decide to
increase air flow through the radiator by adding a second
high flow radiator fan.