What happens if there is no commutator in DC motor?

Well, without commutator, the machine will not develop a unidirectional torque and motoring action will not take place. In a DC motor, at the instant when armature coil passes through magnetic neutral axis, current in armature coil must reverse to maintain torque in the same direction.

Which type of commutator are used in DC motor?

To keep the torque on a DC motor from reversing every time the coil moves through the plane perpendicular to the magnetic field, a split-ring device called a commutator is used to reverse the current at that point.

What does Bldc mean?

BLAC stands for Brushless Alternating Current while BLDC stands for Brushless Direct Current. The difference between the two is the output voltage waveform when back driven (or mechanically rotated rather than electrically), which is also known as Back EMF.

What is armature and commutator?

An armature is an essential component in a DC machine. A commutator is a rotating electrical switch. It gets the flow of current from the windings of an armature. It gets the flow of current from the core of an armature.

What are the two function of commutator in DC machine?

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 a commutator in a DC machine Mcq?

Explanation: Commutator is an electrical device found only in DC machines. It is used to reverse the current direction between rotor and external circuit. It also changes dc voltage to alternating voltage.

Does the commutator rotate?

In both the motor and generator case, the commutator periodically reverses the direction of current flow through the winding so that current flow in the circuit external to the machine continues in only one direction.

What is the purpose of a commutator in a DC motor?

Commutator is simply a mechanical rectifier used to reverse the direction of current every time coil moves through the plane perpendicular to the magnetic field so as to To keep the torque on a DC motor from reversing its direction. For AC motor rectification is not required thus Commutator is not needed rather a slip ring is used.

What is the function of a commutator in a DC generator?

The commutation in DC machine or more specifically commutation in DC generator is the process in which generated alternating current in the armature winding of a dc machine is converted into direct current after going through the commutator and the stationary brushes.

What is the function of commutator in DC machine?

Commutator: In the case of the DC generator, the commutator is used to convert generated AC in armature into DC. In the case of the DC motor, the commutator is used to convert DC to A.C. Due to the limitation of commutator dc generators are not usually designed beyond 650 V

What role does the armature do in a DC motor?

The armature conducts AC even on DC (Direct Current) machines via the commutator (which periodically reverses current direction) or due to electronic commutation, (e.g. in a brushless DC motor). The armature provides housing and support to the armature winding.