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Stepper motors stall either due to load overcoming the magnetism (could be too low of current related or too much load), or the power switching between the coils is set too fast (slow the speed of the steps / power is cycling too fast around the coils).
Could be a controller problem as well, (either controller itself or the signals to the controller are wrong-i.e giving the controller a bum steer on what it really needs to put out).
I've got some NEMA 17 motors, small 6 wire motors (I think it's a Hybrid Motor). They put out a hellava grunt for such a small motor.
They have a max current of about 5amps, but 3amps is good enough. Anything over 3-4 amps and they get pretty warm.
Spent a lot of time mucking around with these motors and different current rates/steps.
Too much current made them really "torqy", but also made them hot real fast.
Too much speed or the wrong step, and they just stalled and buzzed.
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