That's the motor that drives the sanding drum, it doesn't specify the motor that drives the belt that drives the workpiece through the machine. That's the one I was referring too, I should have made that clearer. It looks like a fairly beefy little motor.
You may be able to tell me what it is from the info from the manual for that motor:
Motor (TEFC) .................................................................................................. 1-3/4HP, 1Ph, 115V only
It does a max of 10 feet per minute so its not turning really fast.