Whilst I don’t think I’m going to need to cool the motor
it got me thinking that it may be a useful experiment to see if the ‘Stick A Fan Blade On The End Of The Rotor’ idea would actually work 🤔
So while waiting for some glue to set on another part of the build
I decided to rummage through the junk PC bits box and find an old fan of a suitable size, and I did indeed have on that would fit the bill 😀.
I broke away the outer fan casing to release the motor
and blades and then set about separating the fan blade, which proved fairly simple.
The fan blade has an overall diameter of 45mm which is ideal and there’s a moulded-in centre mark so I used a step cutter to open up a hole to 10mm and then a tapered hand reamer to carefully open up the hole to about 11mm which is the diameter of the end bearing
stub on the rotor.
The fan was then pushed onto this motor
stub until it seated flush on the wide and end of the rotor can and is a very tight friction fit so it doesn’t need any more than that to hold it.
I don’t have a dial gauge but I can tell by eye that the fan is perfectly centred and true and so it shouldn’t cause an imbalance 🤞.
turns clockwise when viewed at the fan end which means that the fan would be pulling air through the side vents , through the stator and around the rotor and would need to exhaust
through a new panel cut into the end of the motor
The existing motor
enclosure still fits perfectly over the motor
and its fan and wouldn’t need any other modification than the extra opening and mesh.
So in theory this arrangement will give forced ventilation
of the motor
in the event that there is a heat problem.
In practice I’ve yet to wire up the motor
to the ESC so I have not been able to run a proper test to check it actually works but I’m pretty confident of it.
This motor cooling
arrangement could prove useful to others when faced with a similar situation which I why I decided to conduct the experiment...... and validate my theory.
Just keep your fingers away from the fan blades…..😨