26 
ALTERNATING GENERATORS AND SYNCHRONOUS MOTORS. 
211. 
212. 
213. 
214. 
215. 
216. 
217. 
218. 
219. 
14 of the Instruction Book the value of the form factor 
which is to be applied in the present design. 
By means of Equation 35 of the Instruction Book, calculate - 
the necessary total number of armature ampere conductors 
corresponding to the flux already given. 
Caleulate the full load current and determine the approxi- 
‘mate number of armature conductors. 
The number of slots per pole and phase being, as already 
stated, fixed at 2, ealeulate the nnmber of conductors per 
slot. It is to be noted that with regard to a perfect 
winding arrangement the next lower, even number of con- 
ductors per slot below that obtained by calculation is to 
be taken. 
The exact number of conduetors per slot being given to the 
preceding question, calculate the corrected number of total 
armature conductors and the amount of conductors per 
phase. 
By means of Equation 38 of the Instruction Book, ealeulate 
the corrected useful flux per pole. | 
By means of Equation 37 and Fig. 63 of the Instruction 
Book, caleulate the approximate armature bore of this 
alternator. 
The armature bore of this alternator being definitely fixed | 
at D = 50 inches, check by means of Equation 38 of the 
Instruction Book the peripheral speed of the magnet 
wheel, neglecting the small difference existing between the 
armature bore and the external diameter of the magnet 
wheel, that is, the air gap. 
The allowable current density for the armature conductors 
being fixed at 2,000 amperes per square inch, calculate the 
necessary conductor section and state the most suitable 
S.W.G. size for same, but do not employ thicker wire than 
.16 inch diameter. 
Determine the most suitable slot shape, considering the good 
ratio of slot width to slot depth, and give a dimensioned 
