300 ELEMENTS OF ELECTRICAL ENGINEERING. 



loss is R" x MP Z . The total power delivered to the rotor is 

 R" /s l x MP Z . The total power delivered to the rotor is 

 also equal to E' x OQ minus core loss minus R f x OP 2 , whence 

 the value of ^ 1 [= i (n 1 /^) 2 ] is known and n may be found 

 since synchronous speed n is given. Subtracting the RP loss 

 in the rotor from the total power delivered to the rotor gives the 

 mechanical power developed, and multiplying the mechanical 

 power by njn f gives the torque in synchronous watts. The 

 entire procedure is the same as in the case of the polyphase induc- 

 tion motor except that ^[=1 (n'/n) 2 '] is used instead of 

 *[*(**'?)/].* 



* The student is referred to the excellent treatise on Alternating Ciirrent Motors 

 by A. S. McAllister ( McGraw, N. Y. ) for further developments of the theory of induc- 

 tion motors. 



