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Originally Posted by Not2B
This stuff is legally "non-flamable". But that doesn't mean you can't make a 5 foot fire ball in your kitchen when your wife isn't home. Nevermind.... (Don't worry - you really need to try to make it burn like that - your robot won't make it go whoosh. It's OK... really it is.)
Has anyone ever thought of making aluminum blocks to mount to the motor, and storing them in a cooler of dry ice between matches? Actually... you may loose most of the cooling by the time the match gets started... just a thought...
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This is not going to help. Actually, even starting the match with ice cold motors doesn't help much either.
The problem is that the Cp of metal is just not that high -- meaning you can't store that much heat energy in them unless a phase change is involved (i.e. melting the metal).
In my opinion, even heat sinks on the outside of the motor can are of only marginal usefulness. Yes, heat sinks will make your motors able to runs somewhat higher current in steady state, but FIRST is not really steady state. Our uses come in bursts. Heat transfer takes time (especially conducting heat out of the windings of the armature, through the air or the shaft to the outer can to the thermal grease to the cooling fins). By that time, your windings are toast.
Air blowing across the armature -- now THAT is cooling. Keep your current down and your armature speed up (1/4 of stall torque) and you'll be fine.
...you mileage may vary...
Joe J.