D-Link DSL-G684T Manual de usuario descargar pdf (Pagina 6)

Unit I A Little bit of theory

1.1. Servo  What and how

To start solving the problem of wireless control system for servomotor we must be

aware of what the servomechanism really is.

Servomechanism

it is an automatic control system in which the output is

constantly or intermittently compared with the input through feedback so that the error or

difference between the two quantities can be used to bring about the desired amount of

control.

The key to understand this is a term  -. For example,

an automotive power window control is not a servomechanism, as there is no automatic



control uses closed loop feedback, which classifies it as a servomechanism.

Servomechanisms with or without motors are used in our everyday life. But we will focus

on particular type that uses DC motor - servomotor.

Servo is a device with a shaft on the outside. The idea is that the shaft can be

positioned in a certain angular position by sending appropriate signal to the servo. When

 unchanged. Any changes in

signal line causes immediate changes in shaft position.

The construction of servo

is based on normal DC motor with

extra gear and control system. The

control system can accurately

determine the position of motor as

shaft rotates the rotary knob which

allows us to position the shaft

with great accuracy. The control

system sets the shaft, depending

on the length of the control pulse

on the line sampled every 20ms.

In most cases, servomotors are

http://www.yourdictionary.com/servomechanism

Figure 1. Construction of the servomotor

[source: http://www.engineersgarage.com/articles/servo-motor]

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D-Link DSL-G684T Manual de usuario Pagina 6