MarkT:
Well the motor plate says its 3.6 ohms (5.4V / 1.5A), but I think that's when used unipolar (its a 6 wire
motor?), so its 3.6+3.6 = 7.2 ohms when used bipolar.For bipolar use it will need 18V or higher supply for a chopper driver because the IR product is 11V,
giving no voltage headroom at all for the chopper - that's why its misbehaving with the chopper driver I think,
the current feedback isn't working properly due to insufficient supply voltage.It also explains why it hasn't completely fried the DC motor shield.
Many steppers are more like 1 to 3 ohms and don't work without choppers from reasonable supply voltages.
yes, it's a 6 wire motor. I discarded the middle wire when hooking up the coils. I'm not really familiar with unipolar or bipolar... I just know I had 6 wires to begin with.
So you think 12 volts is actually too little? Even though the motor says 5.4 volts? The power supply I'm using has a 24 volt rail. You think I should try hooking it up? I don't know much about these things, I don't know what choppers are for instance... Just trying to get it working.