Before revision: In mechanical engineering and control engineering, a servomechanism , also called a servo or a servo system , is a control system for the position and time derivatives (for example, velocity) of a mechanical system using closed-loop control to reduce steady-state error and improved dynamic response.
After revision: In mechanical engineering and control engineering( a servomechanism )(to be differentiated from a servomotor, which may also be called "servo") also called a servo or a servo system , is a control system for the position and time derivatives (for example, velocity) of a mechanical system using closed-loop control to reduce steady-state error and improved dynamic response.