Technical, Techniques, Hints, and Tips > BRUSHLESS Motors and Speed Controllers

Outrunner cooling fan

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gregk9:
Ive seen some outrunner motors  fitted with an external cooling fan. can you purchase these separately or do they only come part and parcel with certain motors?

I don't have space to fit a cooling plate on the nose of the motor, due to the drive setup, but plenty of free space on the back end.
thanks in advance.

Martin (Admin):

Small computer fans are popular for this purpose.


https://www.amazon.co.uk/Bgears-b-Blaster-50-Bearing-Excellent/dp/B06W2N73RX/ref=sr_1_20?s=computers&ie=UTF8&qid=1525099119&sr=1-20&keywords=50mm+fan

 

gregk9:
thanks Martin, but was thinking more of one that actually bolts to the end of the motor casing, so it spins as it rotates, ok so creates a bit of drag, but would draw air through the coils moreso, rather than bolt in something that's going to draw on the batteries, plus dare say wont keep  speed with the revs of the motor.

Martin (Admin):

Ah! OK.... I think most of those are proprietary and / or model specific.   {:-{

malcolmfrary:
On the outrunner that I am looking at, putting a fan on the drive end would do nothing whatever except add drag.  Its the mounting plate that needs cooling since that is the bit that the coils heat, and there is nowhere between the rotating part and the plate for a fan - even if there was, a fan needs somewhere for the air to come from as well as somewhere to go.
A computer CPU fan constantly running could ensure airflow over the motor.  The fact that its speed would be independent of the motor doesn't matter, in fact it would be a benefit since maximum cooling is needed when the motor is pulling hard and slow and a motor fan is at its least effective.

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