THE LEAKAGE FACTOR. 



48. This result is verified by the following series of tests: 

 A. Three-phase current motor for 36 horse-power, 380 volts be- 

 tween the lines, six poles, 42 ~. 



Air-gap A = 0-62 m. tn. 



Pole-pitch / = 30.5 cm. 



If we draw the short-circuit curve, we can interpolate for 380 volts 

 the short-circuit current of 380 amperes. We thus get for the leak- 

 age factor the value 



8.5 



380 



0.0224 



49. B. The same magnetic frame was wound for 24 horse-power, 

 190 volts between the lines, ten poles, 50 ~. 



Air-gap A = i-i ft- m. 

 Pole-pitch / = 18.3 cm. 



Magnetizing current: 31.2 amperes at 190 volts. The short-circuit 

 current at 190 volts amounts to 470 amperes. Hence, 



. 3i- 2 



470 



0.0664 



The following table shows the results of the tests in a per- 

 spicuous form: 



35 



