152 ALTERNATING GENERATORS AND SYNCHRONOUS MOTORS. 
KVA 
cent. less than indicated in Fig. 62, as the ratio = 
N 
375 
pe = 4, requires 115 x 10° = 2p XF, fiux, while the 
actual flux, Fig. 62, is 64 < 1.34 x 10° = 86 X 10°, see 
Par. 178. 
27%. Useful Flux Per Pole.—In Par. 178, the calculation 
of the no-load characteristic of this machine is given, and 
with a form factor of 2.34 the normal useful fiux per 
pole is equal to 1.34 x 10°, which corresponds to 3,000 
volts open circuit voltage. 
278. Peripheral Density.—The full load current per phase 
375,000 
7 2 x 3,000. 
and the number of armature conductors 256 X 15 = 3,840. 
From this, the value of the armature ampere conductors is 
3,840 X 62.5 = 240,000, which results in a peripheral den- 
240.000 ‘ : 
sity of . = 454. This value is equal to that in- 
of the armature works out to be = 62.5 amperes 
109.4 X 3.14 
dicated in Fig. 63. 
279. Particulars of Slots.—The armature winding is placed 
in 256 slots and the coils are arranged as shown in Fig. 
48. The slot dimensions in Fig. 60 give a ratio of about 
2.9 between the slot depth and width. As this value is 
very close to the specified limit, a fairly high armature 
leakage will be found. 
The number of ampere conductors per slot in the present 
240,000 
256 = 937. 
case, is equal to 
280. Space Factor of Slots.—Each conductor consists of 
two parallel connected No. 9 8.W.G. wires, so that each 
slot has 30 wires which are embedded in the slot, as indi- 
eated in Fig. 72. 
