I've got some problem supplying my 4-phase microcon.cz sx17-1705 stepper motor.
Resistance of a winding wired as unipolar is 1.2ohms, rated for current 1.7A per phase.(2V on motor) System voltage is determined by 12V(5Ah) battery. I was first thinking of voltage drive with series resistor in each phase. But it's 10V*1.7=17W. That's way too much for a resistor.
I see now only one possibilty- to buy a step down converter. MC34167 5A separate for each motor. Or something even bigger like http://cgi.ebay.com/DCDC-Convert... rated for 10A. Get it down to 5V and then use 5w resistors.
What would be good solutoin for this case?