That is the setup i did on my pm-45. I got the wheelchair motor from e-bay for 50.00, its a 24 volt motor running on 12 volts and it runs about 100 RPM. I put a switch box on the front of the the mill to turn the charger on and off and a momentary three way switch for the power up & down. I fabicated the mount from 3/16 steel. I got the timming belt and pulleys from mcmaster carr. I have had it on the machine for about a month and it works great.