When turning the handle of the motor-side speed changer, the width of the speed change pulley will change. By varying the pitch diameter of the speed change belt, the pitch diameter of the machine-side speed change pulley will follow to change the rotation speed. The PDS model is a belt-type stepless speed change drive that is incorporated directly into machines to save space. There are 6 sizes from 0.2kW to 3.7kW (4-pole) of transmission capacity.