My son is a copier tech. If you knew what model these came from he could supply voltage info. Its possible when I show him the pic of the driver he willknow right off and may be able to tell me what voltage PS they ran from.
Most copiers run 24v or 28v on the motors, but a few have 35v or even 48v supplies (older ones I think run the higher voltages). The motors themself could probbaly stand much more voltage, but the drives may be a different story. I will see what he says about the pic of the drive.
Jess
GOD Bless, and prayers for all.