Explain the function of commutator in DC generators.
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Commutator is simply a mechanical rectifier
The voltage generated in the armature, placed in a rotating magnetic, of a DC Generator is alternating in nature. The commutation in DC machine or more specifically commutation in DC generatoris 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.Again in DC Motor, the input DC is to be converted in alternating form in armature and that is also done through commutation. This transformation of current from the rotating armature of a DC machine to the stationary brushes needs to maintain continuously moving contact between the commutator segments and the brushes. When the armature starts to rotate, then the coils situated under one pole (let it be N pole) rotates between a positive brush and its consecutive negative brush and the current flows through this coil is in a direction inward to the commutator segments.
Then the coil is short circuited with the help of a brush for a very short fraction of time(1⁄500 sec). It is called commutation period. After this short-circuit time the armature coils rotates under S pole and rotates between a negative brush and its succeeding positive brush. Then the direction is reversed which is in the away from the commutator segments. This phenomena of the reversal of current is termed as commutation process.
The voltage generated in the armature, placed in a rotating magnetic, of a DC Generator is alternating in nature. The commutation in DC machine or more specifically commutation in DC generatoris 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.Again in DC Motor, the input DC is to be converted in alternating form in armature and that is also done through commutation. This transformation of current from the rotating armature of a DC machine to the stationary brushes needs to maintain continuously moving contact between the commutator segments and the brushes. When the armature starts to rotate, then the coils situated under one pole (let it be N pole) rotates between a positive brush and its consecutive negative brush and the current flows through this coil is in a direction inward to the commutator segments.
Then the coil is short circuited with the help of a brush for a very short fraction of time(1⁄500 sec). It is called commutation period. After this short-circuit time the armature coils rotates under S pole and rotates between a negative brush and its succeeding positive brush. Then the direction is reversed which is in the away from the commutator segments. This phenomena of the reversal of current is termed as commutation process.
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WHAT IS THE FUNCTION OF COMMUTATOR IN DC GENERATOR.
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