I was just browsing the web for some links on Servo drives and the exact differences between AC Servo, DC Servo, Brushless DC Servo etc. I happened to hit this site and thought will share it with members. I remember plenty of queries on Stepper motors on this forum. Maybe this link will provide good answers :

http://users.pandora.be/educypedi...orstep.htm

In fact there seems to be lot of other interesting topics on t he above site - maybe somebody who finds some thing more useful can revert back.

Have a nice weekend.

Raghu