Efficiency of DC Generator & Condition for Maximum Efficiency


The power flow input to output is known as power stages or power flow diagram

Efficiency of DC Generator

Efficiency :


     It may be defined as ' the ratio of output in watt (or KW) to the input in watt (or KW) '.

Mechanical efficiency,


Electrical efficiency,


Overall efficiency, η 'or' commercial efficiency, or

Efficiency of a generator



Condition for Maximum Efficiency :


Generator output  =  VI

Generator input  =  output  + losses
   
=  VI + I2 R+ Wc
  
 =  VI + I2 Ra   Wc  

( assuming, I = Ia ; since Ish is very small compared to I )


Efficiency,

η  =  power output /  power input


Since dividing Nr and Dr by VI

     To obtain the maximum efficiency the denominator should be minimum, therefore differentiating the de-nominator with respect to I and equate to zero.


Hence, the efficiency is maximum when

  VARIABLE LOSS  =  CONSTANT LOSS

     

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