VOLTAGE REGULATION OF THE ALTERNATOR. 129 



of the pole pieces completely and uniformly surrounds the arma- 

 ture. 



When a polyphase alternator delivers current to balanced 

 inductive receiving circuits, the axis of armature-magnetizing- 



Fig. 113a. Fig. 



Actual and assumed distribution of <K, unity power factor. 



action (axis of <&') is shifted forwards as shown in Figs. 1 

 and 114$, where is the phase angle between voltage and 

 current in each receiving circuit. When the currents in the re- 

 ceiving circuits lead the electromotive forces in phase by the angle 



Fig. 114*. Fig. 1143. 



Actual and assumed distribution of* 7 , lagging currents. 



0, then the axis of <E>' is shifted backwards as shown in Figs. 

 115^ and 115^. 



Several important things are at once evident from Figs. 113, 

 114 and 115 as follows : (a) The armature flux <' is to a cer- 

 tain extent opposed to the field flux <E> in Fig. 1 14, () The 



10 



