Carbon dust buildup is a concern for any motor. Potential problems are amplified with higher current. My plan right along has been to finish seating the brushes (only another 100 miles to go), then open the motor and blow out the carbon before cranking up the amp limit to the max.
I have heard that a carbon dust buildup > high current flash-over sounds like a gas car backfire. I'd rather not hear that!
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Originally Posted by RE_Farmer
Samway, you're right about motor speed and heat. The Warp9 hp peaks ~3500-4000rpm. Yes, series DC motors do make max torque @ 0 rpm, but they also make max heat. One needs to spin these motor up to get rid of the heat AND to clear out the brushes' carbon dust.
There was a guy at EVCCON that trashed his motor  . George Hamstra took a look at it and thinks it might have been due to excessive carbon dust shorting the motor. To ameliorate the heat, you need to keep the revs up and, or at least add an external blower to cool the motor at low to zero rpm and clear the brush dust. |