Induction Motor. ni:j 



An experiment was carried out to determine the power of the 

 apparatus so designed. It wfis found that when the apparatus wai- 

 generating one half horse-power the current in the field winding 

 was .575 amperes; since there are altogether 9440 turns this gives- 

 for magnetising current, 



5.43 X 10" ampere turns. 



This value lies between tlie predicted limits, viz., 



5.38 > 10^' and 5.86 x 10'^ as in equation (7). 



The rise of temperature of the winding was found from its resist- 

 ance, the temperature coefficient of a sample of the wire having been 

 measured. The temperature rose 47° with all the vents in the 

 apparatus closed. Thus the apparatus realised the power for which 

 it was designed. The ventilation caused by the vents was large^ 

 and with them open the rise was much smaller. 



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