SLIP AND TORQUE 



191 



no. Construction for Slip and Torque 



We shall now show that the slip and torque may also be repre- 

 sented by a very simple graphical construction, shown in Fig. 129. 



If, in Fig. 128, we join BP, then the angle BPC, which stands 

 on the same arc as BFC, is equal to this latter, i.e. to 2 . Thus, 

 tin- angle between the primary current vector and the line PB is 

 equal to 2 . 



In Fig. 129 part of the diagram of Fig. 128 has been reproduced. 



Fio. 129. Construction for Slip and Torque of Induction Motor. 



Referring once more to Fig. 128, we see that tan a = TT^ But 



li 2 



since ( 106) Ha = , we have 



6' 



