THE INDUCTION" MOTOR. 349 



Applying Fleming's rule for the production of a current 

 (see Fig. 1, page 3), it will be seen that the direction 

 of the current in the conductors in the upper part of 

 Fig. 174 will be away from the reader (as indicated by the 

 crosses), while in the lower conductors the current will 

 flow towards him. The direction of the lines of force set 

 up in the immediate neighbourhood of the conductors by 

 these currents is shown by the small circular arrows. The 



FIG. 174. INDUCTION OF CURRENTS IN ROTOR ARMATURE. 



direction of these arrows shows that immediately in front 

 of the rotating lines of the main field the induced field in 

 the rotor is in the same direction as, and consequently 

 repelled by, the main field, while behind the main field the 

 lines are oppositely directed, and are attractive. 



The strength of the current in the rotor conductors is 

 given by the usual rule 



n E.M.F. 



Current = === , 



Impedance 



p M Ti 1 ra ^ e ^ cu ^ing lines of rotating field 

 -Tj.lvi.J: . jQg 



The impedance depends upon the resistance of the 

 conductors, the method of connecting them together, and 

 the self-induction of the rotor winding. 



