Just taken delivery of a chinese TB6560 based CNC stepper driver board.

When I connect up my steppers, the sound from them is akin to water rushing through pipes (the same motors connected to another Allegro A3977 based driver board .... silent as can be)....so what's the noise all about - it makes me want to run to my missus & ask for some Daz.

While I'm here...my stepper spec is listed as this....

8 wire stepper
Rated Voltage 3.0V
Resistance per phase 1 0hm
Inductance per phase 2.1mH
Holding torque 1.25N.m
series connection and phase current 2.15 amp

Now since these are 8 wire, I've wired each of the phases in series, therefore 2 Ohms per coil 'leg'

I'm struggling here to make sense of the rated voltage spec. Just about every driver on the market takes at least 24V DC as an input ...so where does the 3V come into it (I can hazard a guess the resistance is 2 ohm, therefore 3V across the coil would yield 1.25A ...but where do I set the 3V - would this be a setting on the driver board?)