INDUCTION MOTOR 333 



7 2 = the current in one phase of the rotor; 7 2 = /', where 



n% 



HI = the turns per phase per pair of poles on the stator, 



?i2 = the turns per phase per pair of poles on the rotor. 



$1 = the flux per pole linking one phase of the stator which 



would be produced by the current /i acting alone. 



$1 = $i g + $iL- 

 3>i0 = the part of $1 which crosses the gap and links with one 



phase of the rotor. $ iff = v&i, where t>i is a constant. 

 $i = the part of $1 which does not cross the gap, but is the 



leakage flux of self-inductance of the stator. 

 $2 = the flux per pole linking one phase of the rotor, which 



would be produced by the current /2 acting alone. 



$2 = $2 ff + $2L- 



$ 2 = the part of $2 which crosses the gap and links with one 

 phase of the stator. $20 = Vz3?2, where v^ is a constant. 



$ 2 = the part of $2 which does not cross the gap, but is the 

 leakage flux of self-inductance of the rotor. 



$0 = the actual flux per pole crossing the gap and linking 

 with one phase of both stator and rotor; it is the result- 

 ant of $10 and $20. 



$, = actual flux per pole linking one phase of the stator; it is 

 the resultant of $ fl and $LL. 



$ r = the actual flux per pole linking one phase of the rotor; 



it is the resultant of $ and $ 2 z,. 



Ei a = the back e.m.f. generated in one phase of the stator by 

 the flux $ ff . 



the e.m.f. of self-inductance generated in one phase of 

 the stator by the leakage flux 3>n,. EIL = I&i. 



E, = the back e.m.f. generated in one phase of the stator by 

 the flux $ 8 . E a is the resultant of E ig and EIL. 



EI = the e.m.f. impressed on one phase of the stator. It 

 must be exactly equal and opposite to E 8 if the stator re- 

 sistance drop I&1 is neglected. This drop is of the order 

 of 2 per cent at full load. 

 Since EI is constant, E 8 and 3> must be constant. 



Z O = the e.m.f. generated in one phase of the rotor by the 



flux $0. E 2g = s^E lg = sE 2 , where E 2 is the e.m.f. 



which would be generated in one phase of the rotor by 

 the flux $0 at standstill. 



