[dlavery]

There has been some discussion about how hot the Bosch motors can get, and when the thermisters kick in. But has anyone noticed their Chiaphua motors running really hot?

We started breaking in our new gearbox bolted to the front of the Chiaphuas the other night. The plan was to let them run in for at least 10 hours. But after about 20 minutes, I noticed that the motors were running very hot. The first reaction was excessive binding in our gearbox, so we popped those off and just let the motors run "naked" with no load @ about 10 volts. After ten minutes of running they were VERY HOT - to the point that you could not pick them up in your bare hands, and they were a burn hazard.

I know that the normal application for these motors (powered car jacks) do not require them to run for this long. However, I was surprised that no-load running would stress them that much. If it was just one, I would think that one of the motors was bad. But the heating was consistent on both motors. Has anyone else seen this? The duty cycle during the competition will not be as harsh, but the loading will be much more severe. Will we see a lot of these motors turning into space heaters?

-dave