... the relevant value for steppers is not the rated motor voltage, but the rated current!
So your motors would run perfectly with a "normal" stepper driver, if you adjust the current for the motor (best is something around 80-90% of the rated max. current, to prevent overheating).
It's even the other way round - most drivers are supported with 12 Volts, but would run much faster with 24 Volts
Viktor
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