I got a AK17/1.10F6LN1.8 motor, is a 12V bipolar motor that uses 100mA/phase when used in unipolar mode. EasyDriver specification is from 150mA/phase to 750mA/phase, is there any problem to use easydriver to drive this motor?
Do you have a link to its datasheet or similar?
If you use this motor in bipolar mode, leaving the center taps open, the winding resistance is 140 ohms and the rated maximum current is 70 mA/winding. I don't use the BED but I believe that the 150-750 mA are the limitations of the current limiting circuitry of the driver. Since the motor does not require current limiting if the power supply is 16.8 V or less, I suspect you can just ignore that feature of the driver -- as long as you use only full step mode. However, microstepping depends on current limiting and probably won't work.
Right, its 6-wire so can be used as unipolar or bipolar.
The general rule is if it take X amps in unipolar mode (one winding active)
you can use X/sqrt(2) amps in bipolar mode to give sqrt(2) times more torque.
Hence 70mA in bipolar compared to 100mA in unipolar.
Unipolar drive with 2 windings active is also X/sqrt(2) compared to 1 winding
These are purely thermal dissipation limits.