230 



ALTERNATORS. 



of the characteristic, viz., each successive change in power- 

 factor corresponds to a smaller change of angle of phase 

 difference and each successive change of angle corresponds 

 to a diminished proportional armature re-action. 



It will be seen from Fig. 107 that the characteristics for 

 low power-factors appear as straight lines. They are not 

 accurately so, but approximate to straight lines in the case 

 of most machines. The characteristic on non-inductive load 

 is considerably more curved than the other characteristics. 



120 



50 



40 



12 



14 



2 4 6 8 1O 



Amperes. 

 FIG. 10". CHARACTERISTICS WITH VAHIOUS POWER FACTORS. 



16 



18 



The non-inductive characteristic can never be exactly a 

 straight', line, even when the armature core is unsaturated, 

 and eddy current losses, &c., can be neglected.- The reason 

 for the curvature of the line under these circumstances may 

 be easily explained. 



Assuming the total volts generated to remain the same 

 at all loads, they may be represented by the side A B of the 

 triangle shown in Fig. 95, re-drawn in Fig. 108- A B is the 



