ALTERNATING GENERATORS AND SYNCHRONOUS MOTORS. 115 
material with its high price and the iron with its lower 
price, will give the minimum material costs. 
Of course, these minimum costs will be affected by many 
other details, such as current densities, ete., but the proper 
choice of the total flux and armature turns for a certain 
regulation, is the principal factor of the economical ap- 
plication of material. 
187%. Magnetic Flux and Commercial Regulation.— 
Fig. 62 indicates the different values of the total fiux 
6 
252,70 
La 
— 
4s ae 
N = 
A | — 
£00 
Go isi — \ gern | 
‘i ae ewe. 
--7T 
tt 
a e - 
G2 OY oe oe 7 a. 
Q 7 2 3 AT 
$ 6 7 g 3g > gee 
Fie. 62.—AVERAGE FLUX VALUES. 
; ae “a or ee 
2p X F, in terms of oars that is, in terms of the 
capacity of the alternator per unit revolution. 
This data leads to the most favorable division of the copper 
