1.resistance commutation 2.e.m.f commutation
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.
An ac generator produces ac, a dc generator produces dc, it all depends on the generator.
construction of DC generator
Voltage commutation: This is possible in ac circuits...The thyristor gets turned off by reverse bias (negative half cycle) voltage applied across it. This is also called line commutation. Current Commutation: This is possible in dc circuits ...This type of commutation makes use of auxiliary circuit which contains inductor,capacitor,diode and even a thyristor(auxiliary). This is called Forced commutation.
A DC generator, or "dynamo", is very similar to a DC electric motor but cannot be described as "exactly the same as a motor" because a DC generator's designed purpose is not to "use" electricity (which a DC motor does) but to "make", or "produce", electricity.
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.
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 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.
There are two types me dc generator 1 separately excited dc generator 2 self excited dc generator
An ac generator produces ac, a dc generator produces dc, it all depends on the generator.
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)
first dc generator is max generator donno who invented t
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
A DC generator is a DC machine that is driven by an external rotating force. It is constructed the same as a DC motor.
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
construction of DC generator
what is necessity of commutator in DC generator