Servo Motors

Servo Motors
1st January 2009 No Comments Uncategorised admin

 

Servo Motors

Servo Motor

 

These are another kind of DC motors ,but with a built in gearing Feedbck System. These servo motors come in many varieties and can from  0 to 180 degrees. Some rotate through a full 360 degrees or more.

 They are extremely popular with RC plane,boat and Robots with precision handling like arms and legs.

And most of all these do not need any motor drivers circuits

A thing to note is that  servos are unable to continually rotate, meaning they can't be used for driving wheels. There is a modification provided to do so at Society of Robots

Method to Drive a Servo

 

The servo normally has Three wires with it. Connect the black wire to ground, the red to a 4.8-6V source, and the yellow/white wire to a signal generator (such as from your microcontroller). Vary the square wave pulse width from 1-2 ms and your servo is now position/velocity controlled.

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Servo Motors

Servo Motor

 

These are another kind of DC motors ,but with a built in gearing Feedbck System. These servo motors come in many varieties and can from  0 to 180 degrees. Some rotate through a full 360 degrees or more.

 They are extremely popular with RC plane,boat and Robots with precision handling like arms and legs.

And most of all these do not need any motor drivers circuits

A thing to note is that  servos are unable to continually rotate, meaning they can't be used for driving wheels. There is a modification provided to do so at Society of Robots

Method to Drive a Servo

 

The servo normally has Three wires with it. Connect the black wire to ground, the red to a 4.8-6V source, and the yellow/white wire to a signal generator (such as from your microcontroller). Vary the square wave pulse width from 1-2 ms and your servo is now position/velocity controlled.

 

About PWM

Pulse width modulation (PWM) is a powerful technique for controlling analog circuits with a processor's digital outputs. It is used in  a wide variety of applications, ranging from measurement and communications to power control and conversion. The general concept is to simply send an ordinary logic square wave to your servo at a specific wave length, and your servo goes to a particular angle (or velocity if your servo is modified). The wavelength directly maps to servo angle.The standard time vs angle is represented in this chart:

Servo Chart

 

 Pulse for controlling a Servo motor

 

A Great Deal of matter on This can be Found out at Society of Robots

Driving a Servo

Servo just needs to be given PWM to work and this can be given through various Sources.

We will discuss following methods in the Next Post 

 

  • Computer Control
  • 8051 Control
  • PIC Control
  • AVR Control
The mode used will be C in all the mediums and also in VB for use with Windows.
See You Soon
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