290 INDUCTION MOTORS. [Exp. 



be calculated* from the diameter of the circle locus AP'" t which is 

 equal to E-~X amperes. Thus in Fig. I, AP'" = 55.4 amperes; the 

 leakage reactance per phase is E-r-AP'"= 107 -^- 554= 1.93 ohms. 

 35. Leakage Coefficient. The leakage coefficient, or leakage factor, 

 is denned by the ratio BA-^-AP'". To have this quantity small neces- 

 sitates a small air gap. In Fig. I, BA --AP'" = 5.8-^55.4 = 0.105. 



* (343). The leakage reactance can also be calculated as in 25, Exp. 

 5-B; thus, 



Z E -*- Is = 107 -f- 56.6 = 1.89 ohms ; 



X = VZ* R* = V(i.89) 2 (.708)* = 1.75 ohms. 

 The two methods of calculation agree only when h is zero. 



