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Good point. Should work great.Can't really do a side mount. I need a flat spot. I used high temp rtv to mount the fan. I think it should be ok.
On a closed endbell brushed motor it would not make sense. IMO. On an open endbell (rebuildable) perhaps. Brushes generate 90% of the heat. Open endbell motors are heatsinked by default at the brush hoods. I feel on a BLX motor a fan placed on the end where the phase wires are is a proper area for cooling. This is where all the heat is generated from. Phase resistance creates that heat. Of course it will transfer to the can where most people place a fan. Bearings will generate heat also as they age and need lube. But that is not primary heat from load. I have a 20mm fan on that end of my BLX 2050kv motor. I have a 20mm Heatsink attached with a thermal glue at the end. I screwed the fan to the HS. I always got my highest temps at that end of the motor. They are much lower now. Even with this small fan/HS. It important to allow airflow to escape. There must be a gap. You just can't slam the fan against the surface you are cooling. That impedes the CFM's. It does nothing at that point. Just my spin.That fan position... makes sense on a brushed motor.
How much narrower is that pinion versus spur? What percentage difference are we talking?Question, the pinion I am using is smaller width that the spur gear. Is this going to be an issue?
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