pls tell how is wave form of dc generator

[apurvmj]

hi all,
greetings.
I would like to know the wave form of DC generator (available in market) before filtering.
Does all DC generators produce pulsating DC, like AC rectified by full wave rectifier.
Thanks.

 

[alec_t]

If the "DC generator" is a rotary machine then its output prior to filtering will almost certainly be pulsating DC.

 

[apurvmj]

yes I mean the DC generator from rotary machine.
Thanks for the answer.

 

[DerStrom8]

Post removed--incorrect information

 

[ChrisP58]

If your generator is built as a single phase winding with a commutator, and there is no filter capacitance, then the DC output will be pulsating. The voltage will drop to zero twice per revolution.

But if it is wired with multiple phases (like an automotive alternator) then the DC output won't be pulsating, just DC with some ripple. The phases overlap in time so that one is rising in voltage before the previous winding drops to zero.

 

[DerStrom8]

If your generator is built as a single phase winding with a commutator, and there is no filter capacitance, then the DC output will be pulsating. The voltage will drop to zero twice per revolution.

But if it is wired with multiple phases (like an automotive alternator) then the DC output won't be pulsating, just DC with some ripple. The phases overlap in time so that one is rising in voltage before the previous winding drops to zero.

I was picturing something completely different. My apologies

 

[crutschow]

It depends upon the type of DC generator.

If it's a 3-phase rectified-alternator type, such as found in automobiles, it will typically be a full-wave rectified signal, which will have about a 5% unfiltered ripple with frequency determined by the number of poles and the generator speed.

A commutator type DC generator will have a ripple voltage determined by the number of poles and commutator segments with frequency determined by the number of segments, poles and generator speed.