I use low voltage high current type step motors for high speed operations.
High voltage motor means high coil inductance. High coil inductance means slow current (soft changing current).
Therefore 5v 12v type motors can not produce high torque at high speed.
My control and drive electronics has PID curent loop and I use bipolar driver.
If you want to use low voltage motor (low inductance, high current)
your driver electronics must have good current control else motor current has big ripple and motor produce aquistic noise.)
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