362 



INDEX 



Hysteresis losses in armature stamp- 

 ings, 102 

 teeth, 196 



Imagination, value of, to the de- 

 signer, 7 



Inclined surfaces, effect of, on mag- 

 netic pull, 30 



Inductance of A.C. armature wind- 

 ings, 263, 288 



of armature end connections, 304 

 of slot windings (turbo-alternator), 

 329 



Inductor (definition), 72 (see also 

 Armature conductors). 



Inherent regulation (definition), 252 

 (see also Regulation). 



Insulating materials, 37, 40, 95 



Insulation, breakdown voltages, 40 

 of armatures, 91, 96, 207, 258, 329 

 maximum allowable temperatures 



for, 108 

 thickness of, on magnet spools, 41 



Intensity of magnetic field (defini- 

 tion), 12 



Intermittent heating of magnet 

 coils, 46 



Interpole design (numerical exam- 

 ple), 171 



Interpoles, 165, advantages of, 169 

 calculation of ampere-turns re- 

 quired on, 174 



K 



KAPP, DR. G., referred to, 110 

 L 



LAMME, B. G., referred to, 141 

 Language, importance of thorough 



study of, 5 



Lap, or multiple, armature wind- 

 ing, 86 



Leakage factor (definition), 28 

 in alternators, 300 

 in dynamos, 187 



Leakage of commutating poles, 167, 



174 

 Leakage flux, 21 



effect of, in saturation under- 

 load, 305 

 in armature slots, 149, 281 



calculation of, 160, 284 

 in circular lifting magnet, 67 

 in horseshoe magnet, 57 

 in multipolar dynamo, 187 

 in similar designs, 27 

 in turbo-alternators, 349 

 paths, permeance of, in air, 22 

 LEHMANN, DR., referred to, 124 

 Lifting magnets (see Electromag- 

 nets). 



LISTER, G. A., referred to, 46 

 Losses at brush contact surface, 181, 



182, 227, 318 



in armature conductors, 99, 318 

 stampings, 101, 104, 266, 331, 



356 



teeth, 102, 196, 211, 233, 318, 

 331 



M 



McCoRMiCK, B. T., referred to, 307 

 Magnetic circuit, 10; fundamental 



equation, 14 

 of alternator, 299 

 of dynamo, 185, 228 

 circuits in parallel, 18 

 clutch, design of, 50 

 flux, 11; definition, 13 

 force (H), definition of, 12 

 leakage (see Leakage flux), 

 pull (formulas), 29 

 Magnetization curves for iron, 16, 



17, 18, 215 



Magnetizing force (H), 12 

 Magnetomotive force (m.m.f.), 11; 



definition, 12 



distribution of, over armature 

 periphery, 128, 134, 342, 344 

 Magnets (see Electromagnets). 

 Magnet windings, calculation of, 41, 



61, 66 



Materials used in magnets and 

 dynamos, 32 



