The stepper motor normally runs hot. Maybe your lower amp supply simply just can not provide the set current in which case they dont get as hot as the other case, but they miss steps and such.
There is one important thing about it, do you have feedback loop, e.g. how does the system sense the coil current and how do you change the current level. Also i think the system is unipolar tho could have stated that.
There is one important thing about it, do you have feedback loop, e.g. how does the system sense the coil current and how do you change the current level. Also i think the system is unipolar tho could have stated that.