THE INDUCTION MOTOR. 



motive force which sets up the magnetizing current. The vector of 

 this magnetomotive force is represented by the line O C. 



6. The lines of force which are common to both primary and sec- 

 ondary, are the effect of the two magnetizing forces O A and B ; 

 while the lines of induction which pass through the secondary only, 

 can be found as the resultant of O A and O B l . This resultant, O G, 

 must be perpendicular to O B, as O B is produced through the oscilla- 

 tions of O G. 



7. The following list will help to make the diagram more clearly 

 understood : 



O A = Xi is the magnetizing force of the primary. 

 O B = X 2 is the magnetizing force of the secondary. 



OA 1 O A = 

 0~B = 



O D is the field balancing the terminal voltage, 



8. It will readily be seen that, if the drop caused by the ohmic re- 

 sistance of the primary may be neglected without too much inaccu- 

 racy, O D is constant if the terminal voltage is so. We have, Fig. 3, 



Z HA D= Z HOG = Z 6 



OK OK 



~C~K X 2 (i vj) 



-*(-=--') 



C~G 



O~D . Vl 

 4 



