VECTOR DIAGRAM OF MOTOR 



187 



secondary due to the 'current Ii iii the primary. The magnitude 

 i>r tliis i-.m.f. is^MIi, and it is 90 behind the primary current. We 

 may regard it as an c.m.f. impressed on the secondary, and as 



FIG. 127. Vector Diagram of Equivalent Transformer. 



up of (2) the Egla component, in phase with I 2 , and (3) the 

 component, 90 ahead of I a . 



These relations are graphically exhibited in Fig. 127, in which 



