Fanuc Motor Models Stock is mainly AC motors a few DC motors, good stock of Alpha and AC Spindle motors. Click on the Fanuc motor part number below. FANUC servo motor systems include the AC SERVO MOTOR αis series, delivering outstanding acceleration and precision, and AC SPINDLE MOTOR, offering high speed and precision. See Our Help Pages on Fanuc motor part number breakdown page for Alpha Series. and Fanuc servo motor part number meaning page for Ai Series Motor combinations.