I’m getting worried about motor overheating.
You can use aerosol freeze spray to cool the motors rapidly. They are legal to use in a competition.
https://vexforum.com/t/answered-use-of-freeze-spray-to-cool-motors/32133/1
Use cooling spay as suggested by @Aiden Pyle like this
Haha I once saw a team surround their robot before the last finals match and wave paper plates (originally for pizza) at their lift motors to cool them down.
You can also use any canned air that is used for getting rid of dust in electronics. Just hold it up side down and it will get very cold and it is a lot less expensive.
Last year my team took our robot outside into the snow to cool down in between matches, it didn’t work that well
We use our pneumatic bike pump, and pump it with a ball nozzle into the open screw holes.
Last year we had problems with our motors over heating. We tried:
(1) buying fans and blowing air on the motors after each match (did not work)
(2) taking robot outside on a cold winter day (did not work)
(3) fanning it with the tops of our tool bin (did not work)
(4) freeze spray (WORKED!)
Had this happen a few tournaments ago 
not sure how effective is really was, we just ran outside in the cold weather with our bot for the break we has
What make cooling the motors so difficult is that plastic is a very poor heat conductor - and the motors are encased in plastic. Many of the ideas above will work with plenty of time - but if you have matches that are minutes apart, you need something that will conduct the heat rapidly through the plastic casing.
That’s solid analysis. It would be good if you could somehow arrange a metal breach through the plastic shell. Then, you could apply aggressive cooling techniques to that piece of metal. Like, for instance, by spraying it with rapidly expanding refrigerant. I mean air duster propellant. This might carry away a lot more heat than spraying the case.
If only there were some way to arrange to have a metal projection of some sort that breaches the plastic shell…
We’ve thought of that, but it would be against the rules… It would, in essence, be modifying the motors. However, freeze spray works very well.
Would spraying the copper wires be better than spraying the plastic case?
My kids hate it when I do this:
Would spraying the copper wires be better than spraying the plastic case?
I would guess not - for a couple of reasons. First, the surface area of the wires is small - so very little heat transfer. Second, I’m guessing it is one or more integrated circuits inside the motor that overheat - so cooling the wires would do little to cool them down (again, it is a guess that the integrated circuits are the culprit here). But, then again, I am an electrical engineer…
And it would be best if you could arrange the internal structure of the motor casing so that the breaching piece was in contact with other metal pieces inside the shell.
It’s worth a try, at least.
I’m sure you know this Kypyro, but for the benefits of the students on here, this is called a “heat sink.” The bigger the surface area of the heat sink, the better it is at pulling the heat away. For this reason, heat sinks frequently have “fins.” You should be able to look at the back of your refrigerator for an example.
Disclaimer: I’m not recommending that you put fins on your motors. It would look very cool and probably work very well, but would probably break many rules!
In Michigan it’s in the 20 degree range this time of year. Team will take off the batteries and set the robot outside for a few minutes.
What if you sprayed the shaft? Is there anything that could go wrong if the spray gets inside the motor?