I’ve seen them used on sealed motors and they supposedly make a difference.
I don’t get these motors. The cans are designed to be heatsinks( not that this will really cool the stator) and there are fans built into the internals, yet they run hot. I still need to put thermal compound between motor and mounts.
In all fairness, though.I have gained 25 pounds since the quarantine started and am running pretty damn high motor amps.
If I can’t figure out how to cool them down, I’ll just have to decrease motor amps.
I want to know whether the fans should push air towards the can, or away.
I would be inclined to think since you’re using this fan attachment on a sealed motor, air would have to be pushed towards it. Pulling air away wouldn’t make sense since there is no opening to pull air from the sealed can. This is only if we are talking about this specific thingiverse fan design. Others could work if designed differently.
Looking at the thingiverse pictures, it seems thats what the designer had in mind also as the flat side of the fan is pointed outwards away from the motor. Otherwise if the flat side were flush with the back of your sealed motor, there wouldn’t be any intake airflow at all and it would just be a decoration. Going from this, i think its safe to assume air travels from the flat base to the extruding fins and probably what you should do as well.
Like I said previously though, the fan blades dont have any noticeable angle to it so its hard to tell which direction it has to spin to push air. Assuming we’re looking at your board form the back, the left fan attachment will be spinning clockwise while the right spins counterclockwise when you are rolling forward. So either way, one fan will pull, the other push. If it were designed properly, there would be two separate files, one for left and one for right.
Im not an expert, just a nerd whos built a couple custom PCs and watched a bunch of videos on proper airflow/cooling.
On that one, the 300 rpm test corresponds to a force of 16g on the motor.
Anyways I’m hoping that by collecting more info like this over a range of wheel diameters and rpm’s, we can also come up with some good rule of thumb guidelines for Statorade fill levels based on some simple equations given
a) diameter of the motor
b) width of the stator
c) the motor RPM.
And also have a reasonable max RPM number where modest amounts of FF cease to have much of an effect as the acceleration is just too high. For instance, an 80mm outrunner motor spinning 4000 rpm? G force at the magnets is over 700g, and for sure that’s way too much for FF to bridge the gap.