A subcategory covering joint actuators — integrated drive units combining a motor, gearbox, encoder, and control electronics in a single module, used in the joints of robot limbs and torsos.

A servo motor is a motor that operates in conjunction with a control system and feedback loop, enabling precise control of position, velocity, and torque. In robotics, servo drives are widely used in manipulators, motion axes, grippers, and positioning systems where high accuracy and dynamic response are required. A servo can be implemented as an off-the-shelf module or as an assembly of a motor, encoder, and controller.