ALTERNATING GENERATORS AND SYNCHRONOUS MOTORS. 19 
By means of Equation (20), the air gap reluctance will be 
? 0.313 
found equal to r,= 8 X 1.33 x 12 128 x (0.2+0.37) 
2.08 x 0.2 2.08 x (0.2-+-0.2) 
ao Equation (23), gives a field leakage path reluct- 
4 | 
ance of 
0.313 AA 5 
r,1=4x1.25 x Sp ata a xX rn 4X 4.75 x 5.75 = ae 
4.3 6 10.75 
| 
ey 
>» 
N 
20; thy 
] 
qe f 
® An 
7 aR 
| 
| 
Fig. 98.—DIMENSIONS OF MaGNeric Circuit, 550 Hu. P., 375 REvs., 
50-CYcLE, SYNCHRONOUS 3-PHASE Moror. 
Therefore the leakage factor o, is equal to 14+, =1.19, 
say 1.20, see Equation (26). ; 
471. No Load Characteristic.—The leakage factor having 
an assumed value, the next step to take is the calcula- 
tion of the no-load characteristic. In Table 25 the various 
data is collected, while Fig. 99 gives the curve of the no-~ 
