Hi bennyben
Digital servos are no more percise than conventional servos.
When I say this I must bring up the fact that digital servos are newer technology and therefore are used in the newer and more accurate systems.
If the new systems used conventional servos they would be able to acheive pretty much the same accuracy.
Servo motors and stepper motors are completely different in the way they go about position control.
Servos use velocity a command system.
Steppers use a position control system.
What determines the accuracy is the encoder pulses per rev.
That is not to say that encoder pulses translate to the accuracy of the servo.
The servo drive also has a great amount of influance. If the servo drives bandwith and gain are not capable of the resultion required then its useless to use a high count encoder.
I've used a standard DC servo motor with a 81000 PPR encoder which acheived much greater accuracy than a digital servo with a 2048 PPR encoder.
Just a note:
Digital servo drives usually use analog encoders.
Conventional(analog) servos use digital encoders.
Thanx
Boros  |