Anyone have an idea what these steppers might be? Or where to find specs on them? They are on a Series 2 that came to me with a Centroid control. I retired the control about 10 years ago so I can't look at that for any hints.

I do know they are 8 wire and they have Agilent 5605 encoders on them. The only numbers I can see are 05-90 stamped on the edge of the mounting flange.

I've been running them for years no problem but an trying to optimize the performance. I am using Automation Direct Sure Step drivers and there are lots of settings I am not familiar with.