The basis of rotary servo motor is a rotary motor, which converts electrical energy into rotational motion, as its name stands for. The configuration of a rotary motor is divided into a rotor section, which rotates greatly, and a stator section, which supports the rotating section. It is common to use a mechanism such as a coupling, ball screw, cam, or pulley with a control object that is under a load to be moved. Yaskawa offers a wide range of products, from 3.3 W ultra-compact models with low inertia and small capacity that can be held in the palm of the hand to 55 kW models with medium inertia and large torque.