Rotation of servo motor

[SolaiKannan]

i need to purchase a sevomotor for designing a robotic finger.
it will be fixed in the finger joints.

how will a servo motor rotate based on the applied pulse width?
i am programming using microcode studio and simulating using proteus software.

also tell me how much degree will it rotate? is it -360 deg to +360 or if anything else other than this please do tell

 

[kak111]

Basic knowledge about RC-Servo`s

How to Build a Robot Tutorial - Society of Robots

Intro to RC Servos

RC Servo information

**broken link removed**

Servo Database - RC Servo Specs and Reviews

 

[jpanhalt]

First, most low-cost servos will move considerably less than 270° total between extremes. It is safe to count on ±60° to maybe close to ±90° (180° total). The simple reason is that in hobby applications with push rods and such, one does not want to go past center. If you need more rotation, that may be obtained electronically, but there is usually a physical stop in the servo gear train that needs to be removed too. 120° should be more than adequate for any finger joint.

As for the direction of rotation, shorter pulses usually turn the shaft clockwise, if you are looking at the end of the shaft. That is not absolute. Most important, it is easy to reverse rotation in software, and that is a common part of most controllers. Rotation of servos can also be reversed by reversing the connections to the internal pot, if they have one. That was a common practice 20 years ago, but not any longer.

John

 

[cubanflyer]

This may also be of help **broken link removed**

Just to clarify previous post how to mod the servo 360 degree Servo

 

[kak111]

Rotation of servos can also be reversed by reversing the connections to the internal pot

In positioning control systems with measurement of the output shaft real position
Not only position sensor, motor run direction must be reversed too.
Reversing position sensor only cause inverted position feedback
and because of the positioning loop does not work
then servo position can not be controlled.
Motor drives one direction against mechanical stopper and another direction dont move.