Unlike a dc motor, the stepper motor does not "draw" any amount of current it wants. It only receives the current that the driver gives. So that rating is more of a maximum, and the effective current drawn is the one you set on the stepper driver potentiometer by hand. The 0.4A motor is the wrong motor type, avoid it if possible (high inductance low current types). If you already have it you could try use it, but it will probably perform poorly. For the best use 1.68A type for all axes if you have the choice.
↧