How does a commutator work in a DC generator?
The commutator on the DC generator converts the AC into pulsating DC. The commutator assures that the current from the generator always flows in one direction. The brushes ride on the commutator and make good electrical connections between the generator and the load.
What is commutator action?
A commutator is a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit. By reversing the current direction in the rotating windings each half turn, a steady rotating force (torque) is produced.
What is commutation in DC generators?
Commutation in DC machines is the process by which the reversal of current takes place. In DC generator this process is used to convert the induced AC in the conductors to a DC output. In DC motors commutation is used to reverse the directions of DC current before being applied to the coils of the motor.
What does the commutator do?
Note: In a generator, a commutator results in an output of direct current. In a motor, the commutator converts incoming alternating current into direct current before using it to generate motion.
What is the function of commutator in DC motor Mcq?
Commutator is used to convert AC current into DC current.
What is the other name of commutator?
commutator; reverser; current-reverser; switch.
What is the working principle of DC generator?
A DC generator operates on the principle of Faraday’s laws of electromagnetic induction. According to Faraday’s law, whenever a conductor is placed in a fluctuating magnetic field (or when a conductor is moved in a magnetic field) an EMF is induced in the conductor.
What is the role of commutator in electric motor Class 10?
Answer: The function of commutator or slip ring is to change the direction of current through the coil after every half rotation.
Since the commutator is with the armature on the shaft it rotates continuously with the armature on the shaft. For the transformation of current from commutator to output terminals (in case of dc generator) and input terminals to a commutator (in case of dc motor) brushes are used.
How are the brushes in a DC generator connected?
The purpose of the brushes is to connect the generated voltage to an external circuit. In order to do this, each brush must make contact with one of the ends of the loop. Since the loop or armature rotates, a direct connection is impractical. Instead, the brushes are connected to the ends of the loop through the commutator.
Are there animations for electric motors and generators?
Electric motors, generators, alternators and loudspeakers are explained using animations and schematics. This is a resource page from Physclips, a multi-level multimedia introduction to physics ( download the animations on this page ). Homopolar motors and generators (separate page).
How is the output of a DC generator dependent?
DC generator output voltage is dependent on three factors : magnetic field strength. In order to change the generator output, one of these three factors must be varied. The number of conductors in the armature cannot be changed in a normally operating generator, and it is usually impractical to change the speed at which the armature rotates.