GENERAL DIAGRAMS FOR SYNCHRONOUS MOTORS 173 



and secondary. (The primary and secondary windings can be 

 different.) The notation used will be the following: 



T= periodic time (duration of one period), in seconds; 



27T 



o)== frequency, or speed of pulsation of the current; 



R= total resistance of circuit (generator, line, and primary winding of 



converter) ; l 



1= cumulative self-induction of generator and line; 

 s self -induction of converter due to magnetic leakage of armature; 

 L= self -induction added in the form of reactance-coils; 

 X=tt>(Z,+/+.y) = total reactance of alternating current circuit; 

 Z=\/R 2 +X 2 = total impedance corresponding; 

 E= effective E.M.F. (being the E.M.F. supplied by the line or that 



induced in the generator, in the case of a simple transmission 



circuit). This E.M.F. is to be considered always constant 



unless otherwise stated ; 

 q= number of phases of the primary current; 

 e= effective primary (alternating) E.M.F. of the converter; 



-=0= secondary or induced (D.C.) E.M.F.; 







6= ratio of transformation of the converter; 

 7= effective value of one of the primary (alternating) currents; 

 /,, or /,= active component of that current; 

 Id= reactive component of that current; 



<= phase-angle of lag corresponding to ( tan^= 







6= phase-angle between the E.M.F.'s e and E; 

 1 2= secondary (direct) current, proportional to / less the losses; 

 AT= number of peripheral primary conductors per magnetic field; 

 K = reduction-coefficient for primary winding; 

 AT 2 = number of peripheral secondary conductors per magnetic field; 

 A = ampere-turns of (shunt) field-coils; 

 w= number of exciting turns of series-winding; 

 r= resistance per turn of shunt- winding; 

 /o= active current when the load is zero; 

 io= reactive current when the load is zero. 



1 The resistance of the line and generator are negligible in the case of a rotary 

 converter supplied with current from a large distribution-system. 



