I use a variable speed motor salvaged from a thrift store sewing machine. I comes with a foot pedal speed control and 1/4 horse power A/C motor. I have no idea what the final RPM is for my pulley driven winding head, but I can get it to just barely turn or spin way faster than I need.

I think I paid less than $20 for the old sewing machine, they are full of parts useful to the hobbyist. High quality motor, gears, bearings, collar shafts and a very nice thread tension system that now lives on my rod wrapping jig.