Major difference between A C Servo motor and D C servo motor

A C Servo Motor

1.Low power output of about 0.5 W to 100 W

  1. Efficiency is less about 5 to 20 %

  2. Due to absence of commentator maintenance is less

  3. Stability problems are less

  4. No radio frequency noise

6.Compare to DC servo motor it is relatively stable and smooth operation

7.AC amplifier used have no drift

DC Motor Server

1.Deliver high power output

2.High efficiency

3.Frequent maintenance required due to commentator.

4.More problems of stability

5 Brushes produce radio frequency noise.

6.It is noisy operation

7.DC amplifier used have a drift