Here is a pic of the tag on a treadmill motor I have:
http://i757.photobucket.com/albums/x...abellsmall.jpg

Here is a pic of all I have to do to control it as a variable speed motor.
I have a variac plugging into the wall and driving a 4 diode bridge rectifier. The rectifier is driving the motor. I turn the dial on the variac and the motor changes speed.
http://i757.photobucket.com/albums/x...5dollarbil.jpg