SERVO SYSTEMS
A servo system, in the context of domestic electronic equipment, consists in its simplest terms of a movable or rotating load and an electrical drive circuit with two inputs – reference and feedback – and one output. The reference input commands the system, and the feedback input conveys the state or position of the load; the output signal drives the load to the required position or speed such that reference and feedback signals agree; this is called a closed-loop system. The load is now positioned in accordance with the command/reference input, and correction ceases until either the command or feedback inputs change (e.g. motor slowed by additional friction or different speed/position required) when servo output will ...
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