Difference between AC motor and DC motor

There are two types of electric motors , and DC motors. The basic difference between ac motor and DC motor is that AC motor powers on AC current while DC motor powers on DC current, To learn in detail about AC and DC motor comparison table is given below about the difference between AC and DC motor.

What is an AC motor?

The AC  motor’s stator has coils which are supplied with the AC current and produces a rotating magnetic field. The AC  motor’s rotor rotates inside the electric motor’s coils and attached to the output shaft that produces torque by the rotating magnetic field.


How does an AC motor work?

There are two types of AC motors. Synchronous motors and asynchronous motors.

The synchronous motor consists of a rotor which is energized by DC supply. The stator has the 3 phase winding from which power can be supplied. Now when these two supplies are given, that is at certain voltages, current is drawn and the coil inside produces the magnetic fields. When the AC rotating field (though the stator does not rotate, the 3 phase field will give the effect of rotation)and the DC field interact, torque is produced which leads to the rotation.
The induction motor or asynchronous varies in just a single part. It does not have a separate DC field. Instead, the rotor rotates by the effect of inductance or transfer of flux. The rotor will try to follow the 3 phase flux in the stator and hence the rotary. This motor is used in fans.

AC motors and DC motors use the same principle of using an armature winding and magnetic field except with DC motors. In AC motors the armature does not rotate and the magnetic field continuously rotates.

In some applications, DC  motors are replaced by combining an AC motor with an electronic speed controller.DC  motors are replaced with an AC  motor and an electronic speed controller because it is a more economical and less expensive solution.

DC  motors have many moving parts that are expensive to replace, and DC electric repair is usually more expensive than using a new AC motor with an electronic controller.

So as far as maintenance is the concern, AC motors are used mostly as easy availability of AC supply DC motor has a constant maintenance problem.


Sources: <https://physicsabout.com/ac-motor-and-dc-motor/>