heat is a problem, but it is not THE problem…
You have a set of motors that are designed to operate at a top speed of 106km/h (66mph) when powered by a fully charged 10S battery
If you are not operating them in their optimal RPM range they will be very inefficient, using more power than necessary & generating lots of heat…
Drive trains should be designed to deliver a useable top speed. You want to try & keep the RPM in the optimal range to get optimal performance whilst reaching speeds you can manage. This is the problem with hub motors…
Example: I don’t like riding much faster than about 45km/h, mostly because it’s not safe in an urban environment. So I design my drive train to reach a max speed of approx 45km/h. When I am riding I ride at top speed when possible. When I approach a hill it’s at top speed. I have maximum RPM, maximum momentum, This is how electric skateboards (motors) like to work.
Let’s put it in perspective, The drive train I use for my systems
Motor pulley 15T
Wheel Pulley 36T
Battery Nominal Voltage 36v
Why do I use this setup? Because top speed is around 45km/h…& that’s the speed I want to ride It makes sense. right?
Now If I swap the motor to a 450KV motor… the top speed is now 106km/h… it wouldn’t make sense, there is no advantage. There is not a single person on this forum that would agree that using a 450KV motor is a good idea.
The expected issues of using a 450kv motor on my skateboard
- Very poor starting performance
- Very poor hill climbing performance
- Very high current draw at low speed, High current peaks whenever loaded.
- Battery discharge problems, reduced life expectancy.
- ESC Problems.
- Overheating motors.
Using 12S battery on Carvon hubs won’t really solve any problems, It may actually stress your motors more. Your top speed now is 126km/h (79mph). The motor RPM when “at cruising speed” is now even lower than before. The higher voltage will simply make your motors want to spin faster, However, they will not necessarily be able to if they don’t have enough torque in that RPM range to reduce the load of the rider. The load on the motors & the torque output at low RPM is the problem Because torque is current you will need to pull more current until the load is reduced, which won’t really happen unless you reach the optimal (higher) RPM range, which won’t happen either. So your hill climbing performance probably won’t improve.
If anything, it might actually make sense to use lower voltage on Carvon HUBS. 6S is probably better suited. It may actually be more efficient.