I have a project using a 12-24VDC Mabuchi brush motor with a gearbox; At its nominal 24DC, it spins 45rpm, draws 280mA no load, and stalls a 750mA. 7.5 in-lbs of torque and is rated for continuous duty. (description taken directly from the sciplus website)
I have it hooked up to a AC to DC adaptor which is 0.375dc, .3 amps, which gets it to run at just the perfect speed I need it to, but after being run for a few hours continuously it has intermittent stutters and stops, never quitting completely, though. It's currently installed as part of a gallery piece, and the gallery isn't very happy, thinking this motor is somehow burned out. Can such a low voltage applied for long periods of time really 'burn out' a motor so tough? I feel like I'm missing something here.