Difference between DC servo motor and AC servo motor, What is inertia

[ponalagappan]

Hi,

A servo mechanism has servo motor with the gear system , sensors , feedback and controller. Somebody can say clearly the difference between DC Servo motor and AC servo motor. What is Inertia?

[Prabakaran P M]

Hi,

Following are main difference between AC servo motor & DC servo motor

A.C. Servo Motor	D.C. Servo Motor
Low power output of about 0.5 W to 100 W.	Deliver high power output.
Efficiency is less about 5 to 20%.	High efficiency.
Due to absence of commentator maintenance is less.	Frequent maintenance required due to commentator.
Stability problems are less	More problems of stability.
No radio frequency noise.	Brushes produce radio frequency noise.
Compare to DC servo motor it is relatively stable and smooth operation.	It is Noisy operation.
AC amplifier used have no drift.	DC Amplifier used have a drift.

The Moment of inertia is the measure of an object's resistance to changes in its rotation rate. inertia of the load is a key measure for sizing servomotors. 

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