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The rotor of a d.c. generator naturally produces an a.c. voltage as it spins. In order to create a d.c. voltage, it is necessary to reverse the machine's output every half cycle -i.e. each time the voltage 'goes negative', so to speak. This is done using a split-ring commutator which is basically a rotating switch. At the same time, the commutator provides a means of connecting a rotating coil with a fixed external circuit.
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What are the problems of commutation in a DC generator?
1.resistance commutation 2.e.m.f commutation
What is commutation in DC machines?
It is the process of conversion of generated ac voltage into the armature of a dc generator to dc voltage at the terminal of the dc generator by use of pair of brushes and commutator. OR It is the process of conversion of given dc voltage at the terminal of the dc motor to ac voltage in the armature windings in a dc motor by use of pair of brushes and commutator.
Is the output from a dc generator not pure dc?
The output from a DC generator is not pure DC due to the presence of ripple voltage, which results from the mechanical commutation process. As the generator's rotor rotates, the commutator segments switch connections, leading to fluctuations in voltage. While the output is predominantly direct current, these variations can cause it to deviate from a perfectly smooth DC signal. Additional filtering may be required for applications needing a more stable output.
Armature reaction in a DC generator?
ARMATURE REACTION in DC MachineAll current-carrying conductors produce magnetic fields. The magnetic field produced by current in the armature of a dc generator affects the flux pattern and distorts the main field. This distortion causes a shift in the neutral plane, which affects commutation. This change in the neutral plane and the reaction of the magnetic field is called armature reaction.
Different types of DC generator?
There are two types me dc generator 1 separately excited dc generator 2 self excited dc generator
Which is usually produced by a generator ac or DC?
An ac generator produces ac, a dc generator produces dc, it all depends on the generator.
What are the difference between choppers and inverters?
chopper transforms ac to dc (dc chopper) while all inverter transform dc to ac commutation used in chopper: forced,load commutation used in inverter:forced(180 vsi),natural or line(120 vsi)
What is the role of a commutator in an electric generator?
The purpose is to counteract the feld distorsion that is caused by the armature current. If this is left as is , the commutation properties of the gnerator will be disturbed, the commutation will not take place in the neutral zone and brush sparking occurs. With correctly sized commutating poles the commutation at the brushes will be in the neutral zone regarless of armature current, no sparking occurs, and a anual adjustment of the brushgear position at different loads is not needed
What was the first DC generator name and inventor why it is call generator?
first dc generator is max generator donno who invented t
How do you make DC generator?
A DC generator is a DC machine that is driven by an external rotating force. It is constructed the same as a DC motor.
Types of generators?
By the operation supply 1.AC generator 2.DC generator In DC generator we are having the following types according to the construction 1.DC Series Generator 2.DC shunt Generator 3.DC Compound Generator
Explain the construction and working of simple loop dc generator?
construction of DC generator
