Sorry to bump an old thread but I'm in an almost identical situation and some people here seemed to know what they were talking about.
I'm wanting to power 2 cheapo Nema 17 steppers:
http://www.ebay.co.uk/itm/322164018908
Controlling (hopefully) with a A3967 EasyDriver Stepper Shield
http://www.ebay.co.uk/itm/172312155458
Powering with a DC 24V 10A 240W Regulated Switching PSU:
http://www.ebay.co.uk/itm/191827226504
Any idea if this power supply is going to cut the mustard? Or overkill / underkill? It looks a bit big and terrifying for a couple of small motors.
Learning from the previous messages, I've done my calculations:
Each stepper:
1.33A per coil
2.66A total per stepper
2.8V Rated voltage (not certain)
Therefore :
7.448W
So in total, for two steppers, the PSU needs:
12-24V
15W
5.32A
Any help would be invaluable 