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Servos

Servo motors typically mean a type of motor that is equipped with an integral or external motion encoder that supplies a motor driver or motion controller with a positional error signal, hence closing the loop of command, execute, check position, correct if needed.

 

It is usually used to describe a brushed or brushless AC or DC motor, but can also be applied to the stepper variant of DC motor equipped with an encoder; of course, this confuses things somewhat.