SHORT-CIRCUIT CURRENT AND LEAKAGE FACTOR. 



The motor shall develop 20 horse-power, at a voltage of 380 be- 

 tween the lines, and a frequency of 47 p. p. s. The slots in armature 

 and field were closed, but the bridges were thin. The shape of the 

 slots in armature and field are represented in Fig. 12. The motor had 

 six poles, therefore its synchronous speed was 940 r. p. m. 



The following table shows the starting or short-circuit current as- 

 a function of the terminal volts measured between the lines : 



36. These values are graphically represented in Fig. 13. From this 

 curve we interpolate for 380 volts a current of 140 amperes. The 

 energy dissipated into heat in the windings and in the iron amounted 

 to 30 kilowatts. This point lies upon the broken line curve in Fig. 

 15, deviating, therefore, not inconsiderably from the full line curve, 

 representing the semi-circle of our diagram. The data determining 

 this circle are given in the following table : 



The curves corresponding to these data, are graphically represented 

 in Fig. 14. The maximum output of the motor is 35 horse-power^ 



25 



