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Freeze the motors?
If you are serious about cooling the motors, make some small brackets with small fans on them blowing right over the brush assy. I would avoid the compressed air route as you might start shorting things when the ice thaws out.
( it will ice over ) You are trying to fix a fundamental design/fabrication flaw in 30 seconds and it won't work well.
Check the motor alignment too, if you are putting a side load on the motor ( as in, up, down, left or right on the shaft ) it will make the motor very unhappy and sometimes have results you describe.
If you are really cooking them that badly, might i suggest going down to 30amps instead of 40, if you are using 40 now, it might save your motors. Tripping a breaker for 5 seconds in a match is better than cooking a motor and being dead for a minute. ( in general ).
__________________
"Put your hand on a hot stove for a minute, and it seems like an hour.
Sit with a pretty girl for an hour,
and it seems like a minute. THAT'S relativity." -Einstein
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First Resume: (If I can remember)
2001 NJ Regional
2001 Championship
2002 NYC Regional
2003 OH Regional
2003 Championship
2004 OH Regional
2005 Finger Lakes Regional
2006 Finger Lakes Regional (yes!)
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