- Jun 4, 2022
mckidney said:PS: I am using weight as representation of thermal capacity, It is reasonably safe assumption for metal involved.
Finished reading posts and sources I could find from this thread:
I must say this is amazing how much work people put together here.
As it is with cooling electronics, most of the principles here are the same.
There are a few key differences:
- Capacity of the stator is going to be the same or bigger than the shell. Making cooling the shell very inefficient,
- The resistance between motor and the shell is incredibly high due to air isolation. Static wheel would sit warm while the core is overheating.
- Heat transfer between the two is only efficient when wheel is spinning. With or without statoraid. (I guess more with the ferro-fluid as you are losing most of the benefit and gaining nothing).
- 10 liters of water would keep the motor cool practically forever. By the time you are done riding the water canister would be ready again due to losses. 2 liters is more than enough for a cooling break.
Which brings me back to water - once I get my statorade and fins I want to get HVAC copper tubing and run it around the shell next to the fins. It should add little weight and allow easy fill port. Wheel would still need to turn for it be effective, but that can serve as a benefit when designed correctly.
Back to your original question, weight added by the lipo, fan would not have measurable impact on a stationary wheel. It would be like blowing wind on a house with decent isolation. You are probably better off bringing a stand and touching the throttle once in a while