ALTERNATING GENERATORS AND SYNCHRONOUS MOTORS. 193 
factory result, see Fig. 86. The maximum number of 
field ampere turns required is 6,000 x 24 = 144,000. 
The excitation voltage is specified as 160 volts. 
The coils, possessing ample winding space, we will allow 
a maximum current density of 1,600 amperes per square 
inch; consequently, the conductor section will be equal to 
160 = 144,000 = x 2 where g = 0.0288 
lu” 
and the length of mean turn, 40 inches. 
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Fie. 86.—CHARACTERISTICS OF 520 KVA., 300 Revs., 60-CycLE, 
SINGLE PuoAsE ALTERNATOR. 
368. Particulars of Field Winding.—The sectional area 
is too small to employ an edge wound, flat strip winding 
so a No. 6 8.W.G. wire, having a section of 0.02895 square 
inch, will be used. 
With the assumed current density of 1,600 amperes per 
square inch, the current will equal 1,600 < 0.02895 = 46.5 
6.000 
46.5 
amperes, and the number of turns per pole will be 
=> 150. 
