162 ALTERNATING GENERATORS AND SYNCHRONOUS MOTORS. 
stock, we will decide to use it, inasmuch as suitable frame 
patterns are also at our disposal, which may easily be 
altered in width, according to the necessary armature 
length. 
The standard stamping which will be used, has 36 slots of 
the dimensions as indicated in Fig. 74. 
302.—Pole Pitch and Are.—The pole pitch is equal to 
5X 3. . 
° - 3 = 9.18 inches, so that with a pole are ratio of 
0.65 we obtain a pole are equal to 9.18 X 0.65 = 6 inches. 
ta 
. ts % 
5. f: | i 
aie 
Pi In 
3 13h 
ae E ago. es 
: if 
Fie. 74.—175 KVA., 400 Revs., 40-CrcLE, 3-PHASE ALTERNATOR, 
For the armature we choose the long type of coil laid in open 
slots, so that the form factor k, of the E.M.F. will be 
2.46 (see Table 14). 
3035.. Armature Ampere Pee tage reference to 
Fig. 62, we find that for a capacity of in = 0.44 KVA. 
per revolution, the most suitable total flux will be about 
43.5 X 10° magnetic lines and the corresponding value of 
armature ampere conductors is equal to 
2.46 
paee.4 a 6 
0.44= (3Z XC) X 43.5 x 10 X Teo x 107 
where 3.Z X C = 49,500, from Equation (35). 
