What would happen if there was no commutator in a DC motor?

Without a split ring commutator the current would not reverse when armature reverses, and the magnetic fields of the rotor and stator would clash and the rotor will stick in a position and not turn.

Can a DC motor work without commutator?

No, a direct current motor cannot run without a commutator because there is no induced electromotive force inside the armature. The commutator plays the function of supplying current to the armature from the brush. That is why the armature removed will not supply the motor. Further, it will stop the running.

Why does an AC motor not need a commutator?

AC machines do not need a commutator. A commutator converts ac to dc and vice versa. Allow the conversion of ac to dc at the generator’s output. …

Why commutator is not a full ring?

The split in the commutator ring is not just to break or connect the circuit. It’s also to define the direction of current through the wire windings, thereby generating a magnetic field. If there weren’t two gaps, the current would not flow through the wire windings.

What will happen if the back EMF of a DC motor vanished suddenly?

If back emf of a dc motor vanishes suddenly, motor circuit will try to retain back emf by drawing more current from supply. As the back emf vanishes zero, the whole supply voltage appears across armature and heavy current flows.

How does a DC motor commutator work?

Commutators are used in direct current (DC) machines: dynamos (DC generators) and many DC motors as well as universal motors. In a motor the commutator applies electric current to the windings. By reversing the current direction in the rotating windings each half turn, a steady rotating force (torque) is produced.

What is the function of commutator in an electric motor?

The function of commutator ring in an electric motor is to reverse the direction of current flowing through the coil every time coil just passes the vertical position during a revolution. Hence as the direction of the current is reversed, the torque is changed in the direction.

How does commutator convert AC to DC?

In a generator the commutator picks off the current generated in the windings, reversing the direction of the current with each half turn, serving as a mechanical rectifier to convert the alternating current from the windings to unidirectional direct current in the external load circuit.

Can a direct current motor run without a commutator?

No, a direct current motor cannot run without a commutator because there is no induced electromotive force inside the armature. The commutator plays the function of supplying current to the armature from the brush. That is why the armature removed will not supply the motor.

Why does a DC motor have more resistance than AC motor?

As the motor is DC so the field and armature winding made for DC supply. The winding which is made for DC always has more resistance than the winding which is made for AC. So when we give AC supply self-inductance will be produced in the winding which opposes the current which further decreases the production of flux.

Can a universal motor work with AC power supply?

Although its construction is very similar to a series-wound DC motor, a universal motor incorporates several modifications that allow it operate properly on either DC or AC power supply. For proper operation with AC supply, a universal motor incorporates a compensation winding, in series with the armature and field winding.

What is the function of the commutator of a DC motor?

The commutator of a DC motor is a cylindrical structure that is made of copper segments stacked together but insulated from each other using mica. The primary function of a commutator is to supply electrical current to the armature winding.