Commutator is the only difference b/w AC &DC motors or some thing else?

Ans. Following the the three main differences between AC and DC motor.

1.
The most basic difference is the power source. A.C. motors are powered from alternating current (A.C.)

D.C. motors are powered from direct current (D.C.), such as batteries, D.C. power supplies or an AC-to-DC power converter.


2.
A.C. induction motors do not use brushes; they are very rugged and have long life expectancies.

D.C wound field motors are constructed with brushes and a commutator, which add to the maintenance, limit the speed and usually reduce the life expectancy of brushed D.C. motors.

3.
The final basic difference is speed control. The speed of an A.C. motor is controlled by varying the frequency, which is commonly done with an adjustable frequency drive control.

The speed of a D.C. motor is controlled by varying the armature winding’s current.

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