How much heat will we generate in the motor controllers - we don’t want to do a crazy over designed cooling solution because we know we can do better.
The motor datasheet specifies the heat dissipation in terms of current and voltage. The current will be higher when we need more torque from the motors, so we look for hills in the route map (ASC 2018 data) and see how much power we will need to dissipate. We will also look at the case of accelerating from stop to full speed, then maintaining that full speed (which we will likely do at some point during testing).
Aiming for 16m/s throughout the race.
Average of all the positive torques is 17.2m (treating the distance between each 2 points as identical).
This data is the map from ASC 2018 with waypoints along the route. We will look closer at the hills at the 1.3 and 2.5 markers.
At 1.5: climbing 1100 over 120km, 13Nm
At 2.5: climbing 800 over 160km, 9Nm
How long will these hills take?
120km @ 16m/s = 7500s = 125minutes, so we can assume this to be steady-state.
Emergency services testing track hill:
Using a combination of this site for elevation and google maps for distance, assuming the distance google gives is the hypotenuse of the triangle:
https://www.mapcoordinates.net/en
https://www.google.com/maps/dir/43.4365484,-80.5795813/43.434044,-80.576786/@43.4357277,-80.5800187,966m/data=!3m1!1e3!4m2!4m1!3e1!5m1!1e4
369m to 384m over 350m gives a 2.5 degree hill.
COTA Turn 1
Roughly a 30 metre elevation gain over 210m, assuming the distance google gives is the hypotenuse of the triangle.
https://www.google.com/maps/dir/Circuit+of+the+Americas,+9201+Circuit+of+the+Americas+Blvd,+Austin,+TX+78617,+United+States//@30.131248,-97.6388914,664m/data=!3m1!1e3!4m9!4m8!1m5!1m1!1s0x8644b03ad152eaf9:0x8ae827dd1ff5e0ed!2m2!1d-97.6358511!2d30.1345808!1m0!3e1!5m1!1e4
30m rise over a 210m hill gives a degree of 8.21