Powering several 12V stepper motors with one source.

hey everybody,

i have a question regarding powering 12 12v stepper motors at the same time with only one power source.
as you can see in the picture i attached, i am using sparkfun's easydriver stepper driver to make my steppers work. the steppers are supposed to be of the model "mercury motor sm-42byg011-25".

building the attached setup i would use 12 external power sources, but i wonder if it is possible to power the entire thing with only one source. and if yes, how do i find out / calculate what kind of power source i need?

thanks in advance, i apreciate your help.

yours,
marcel

Well if you look up details of that motor you'll find datasheet saying its windings are 34 ohm, so each takes 0.35A.

If you use full-wave drive then each motor will have both windings on at once in some phases, so thats 0.7A per motor, otherwise 0.35A per motor.

So you need either 12 * 0.7 (= 8.4A) or 12 * 0.35 (= 4.2A) 12V supply. In practice allow a bit of spare capacity so either a 10A or 5A supply depending on whether full-wave or not.