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Unread 06-01-2002, 19:43
Kit Gerhart's Avatar
Kit Gerhart Kit Gerhart is offline
Mentor, coach, whatever--
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Re: It is pronounce "Chip-ee-wah"

Quote:
[i]

If you double the size of the motor, you quadruple the surface area of the motor. So... If you have the same about of heat generated per second inside your motor windings but the motor is twice as large, you will only generate 1/4 the delta in temperature that the smaller motor would generate.

[/b]
Doesn't this assume that temperature rise is only a function of the thermal mass of the motor and that cooling is only a function of 'radiation' from the outside of the motor? This is probably a good model for what might happen with drive train motors in a two minute match, but for lighter loads, when allowed to 'spin,' the drill motors can have a fairly low equilibrium temperature because of the cooling from the little fans that pull air over the armature and commutator. We can run our robot indefinitely in low gear without the motors getting very hot. Of course, when running for a long time in high gear, more heat is generated and the fans don't move as much air, so occasionally the smoke leaks out of the motors.
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