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Topic: EXPLANATION: SERVO vs SERVO MOTOR and driver (Read 233 times) previous topic - next topic


Feb 22, 2018, 11:24 am Last Edit: Mar 07, 2018, 02:27 am by lastchancename
Just to help explain a simple but often misquoted concept.

A SERVO is a closed-loop control system.
It may _not_ be a motor, but typically is*, using feedback to create a stable, deterministic output from the controlled device.
You provide a reference, and the servo control system varies the output to equalise the feedback with the reference value.

* it /could/ be a fluid servo that maintains the specific level in a tank..

Many servo systems utilise MOTORS to delver mechanical output.
It /could/ be a STEPPER motor with step-counting, limits, feedback and drivers to achieve the desired motion control,

OR in ArduinoLand...

the MOTOR might well be a generic DC motor, with attached feedback electronics to achieve a simpler type of low-cost closed-loop control.
This is typically what is inside your *RC 'hobby' servo*.

The reference is a pulse-train which the motor driver 'chases' while moving the motor shaft - providing feedback to the 'closed-loop' driver to maintain equilibrium.
Some gearing is often provided to deliver reasonable torque, speed and stability at low cost.
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