I just received 3 surplus Compumotor AL-Drive drivers. I have a bunch of surplus 110oz steppers rated at 3.1A / 2.9V that I want connect to these drivers. However, in reading the manual (http://www.compumotor.com/manuals/a-ax/a_ug.pdf) there is a warning:
Motors must have a minimum inductance of 20mH (end to end).
What does 'end to end' mean?
How do I determine what the inductance of a stepper is without access to a scope to measure the time constant?
In other words, Can I use my motors with this driver?
techref.massmind.org/techref/inductor/measure.htm Has a means of measuring inductance without a 'scope... it does require a sine generator, however. If you have an Arduino, or other easily programmable uC, you may be able to make a sine generator without too much trouble. Here are some ideas for the uC part: techref.massmind.org/techref/new/letter/news0404.htm
Or you can purchase a meter that can measure inductance. I've seen models that can do that for as little as $25.
James hosts the single best wiki page about steppers for CNC hobbyists on the net:
http://www.piclist.com/techref/io/steppers.htm Disagree? Tell him what's missing! ,o)