Stepper motor vs amps per phase question???

Hi all... I an currently building a power supply for three steppers, each running at approximently 3 amps per phase.......

If I understand how steppers work, I believe they switch back and forth from there phases, and therefore a stepper that requires 3 amps per phase, only needs a total of three amps, because of the switching process....... or does it?

Now as far as series vs tap, ect... I know that a steppers wiring configuration determinds what the total amps and is not part of the question.

Thanks,
Russ

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