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Servomechanism
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==Types of performances== Servos can be classified by means of their feedback control systems:<ref>G. W. Younkin, Industrial Servo Control Systems β Fundamentals and Applications β Second Edition, Taylor and Francis, 2007.</ref> * type 0 servos: under steady-state conditions they produce a constant value of the output with a constant error signal; * type 1 servos: under steady-state conditions they produce a constant value of the output with null error signal, but a constant rate of change of the reference implies a constant error in tracking the reference; * type 2 servos: under steady-state conditions they produce a constant value of the output with null error signal. A constant rate of change of the reference implies a null error in tracking the reference. A constant rate of acceleration of the reference implies a constant error in tracking the reference. The [[servo bandwidth]] indicates the capability of the servo to follow rapid changes in the commanded input.
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