Today in this blog we will see what is Servo Motos and how it works ? Where we use servo motos and a short explanation about servo motors.
Specially we will learn the following points today-
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What is Servo Motors?
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What is Servo Motors Mechanism?
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Working Principle of Servo Motors?
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Controlling Servo Motors
Table of Contents
What is Servo Motors?
In a simple way a servo motor is an electrical device which can push and rotate an object with great precision.If you want to rotate an object with some specific angles or distance then we use servo motors.It is just made up of simple motors which run through servo mechanism.If motor is used in DC power then the motor will be called as DC Servo Motor and if the motor is run through AC power then the Motor will be called as AC Servo Motor.Due to these amazing features, they are being used in many applications like toy car, RC helicopters and planes, Robotics, etc.
Servo Motors are rated in kg/cm (kilogram per centimeter).This kg/cm tells you how much weight your servo motor can lift at a particular distance its just simple math.If you dnt understansd this KG/CM consepct then take an example A 6kg/cm Servo motor should be able to lift 6kg if the load is suspended 1cm away from the motors shaft,
the greater the distance the lesser the weight carrying capacity.
What is Servo Motors Mechanism?
Servo Motors working mechanism basically works on there parts and they are
- Controlled Devices
- Output Sensor
- Feedback System
Servo Motor System is closed-loop system where it uses positive feedback system to control motion and the final position of the shaft.
Servo Motors Working principle :
DC Servo Mechanisam Consits Four Parts and They Are
1.Control Circuit
2. DC Motors
3. Gear Box
4.Potentiometer ( it is the main difference of AC or DC Servo Motors )
See the diagram below and you will understand
AC Servo Mechanisam Consits Four Parts and They Are
1.Control Circuit
2. AC Motors
3. Gear Box
4.Encoder ( it is the main difference of AC or DC Servo Motors )
See the diagram below and you will understant
Controlling Servo Motors:
Servo motor is controlled by PWM (Pulse with Modulation) which is provided by the control wires.
There is a minimum pulse, a maximum pulse and a repetition rate. Servo motor can turn 90 degree from either direction form its neutral position. For example, a 1.5ms pulse will make the motor turn to the 90° position, such as if pulse is shorter than 1.5ms shaft moves to 0° and if it is longer than 1.5ms than it will turn the servo to 180°.