Servo Drive

It depends upon the application, but generally the difference is precision. A servo drive is DESIGNED to provide very specific acceleration and deceleration profiles so that you can have predictible responses to commands, whereas a standard motor and drive, even with vector control, is not. But a servo drive is not typically designed to provide a lot of overload capacity, where a standard AC motor and drive is.

THANK'S for answering ,

i have a problem , i m doing a process in which i have to unwind a paper roll , i just know the paper roll width and diameter and just spped of winder for that i have to control the tension as an open loop system by i/p converter using break , i can't use any other hardware can you help me doing this..!!!

First we need to know how many process are there..next we need to know whether to control tension on each process. If you just want to unwind a paper roll and supply to the next process...you just need a AC or DC motor , inverter or DC drive with PID control card and very important is that u need to install a tension detector at the steel roller where the paper travel ,if possible pass the paper 60 t0 70 degree angle toward the steel roller. This will ensure stable tension signal output from the detector.Next you have to feed this signal back to the PID card. As you adjust the potentimeter on tension controller , the signal will be either + or - ,hence this will control the motor fast or slow(braking)

If you use a very big paper roll 3000kg to 5000kg , you need to have dynamic braking system.(regenerative braking ) for your unwinder motor.Especially if you use a DC motor.You can contact Reliance Electric , they can help you to setup.

Hope this info can help you.