DC Printer motor to AC
If you still have the original printer power supply shown in your photo (which puts out 32VDC at up to 625mA) then you just need a DC/DC step-down regulator to reduce the voltage, like this:- 

5A DC-DC Adjustable Step-Down Buck Power Converter Module DC 5-36V to 1.2V-32V with LED Voltmeter



If you want to vary the motor speed then get a PWM controller like this:-

Micro DC3V~35V 5A PWM DC Motor Speed Controller