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Originally Posted by
Al_The_Man
I think there is some confusing statements here, unless it is lost in translation.
Here is the Wikipedia definition.
"Servomechanism may or may not use a servomotor. For example a household furnace controlled by thermostat is a servomechanism, yet there is no motor being controlled directly by the servomechanism.
A common type of servo provides position control. Servos are commonly electrical or partially electronic in nature, using an electric motor as the primary means of creating mechanical force. Other types of servos use hydraulics, pneumatics, or magnetic principles. Usually, servos operate on the principle of negative feedback, where the control input is compared to the actual position of the mechanical system as measured by some sort of transducer at the output. Any difference between the actual and wanted values (an "error signal") is amplified and used to drive the system in the direction necessary to reduce or eliminate the error."
Basically If any motor is used for closed loop positioning via means of any type of feedback device or transducer, whether on the motor or not, it classifies as a servo system.
Al.