Wiring in series will give you better torque at the lower speed, but due to inductance as the speed increases the torque will drop off very quick.
Connecting in parallel while giving slightly less torque at the lower speed but will give a lot more torque at the higher speeds.
Power wise you will get a lot more power in parallel, but you also need to give twice the phase current.

What are the motors?

Gary

Quote Originally Posted by bobin View Post
hi,
great information..on wiring steppers...? wondering with a bipolar driver board,is it better to couple
an 8 wire stepper motor as parallel or series,,is there any advantage in one particular way..if you choose parallel will it need twice the recomended current per phase...just
burnt out two sets of routout 10 amp boards and motors.so would like to be a little more certain of what we are doing...thanks bobin