352 



INDEX. 



Compound generators, efficiency of, 58 



uses of, 4 

 Compound motors, 27-61 



characteristics of, see Character- 

 istics 



Condenser excitation of induction gen- 

 erator, 297 

 Condensers for starting single-phase 



motors, 267 

 Conductance, 115 



of parallel circuits, 120 

 Constant losses, 47 



Converter, synchronous, see Synchro- 

 nous converter 

 Copper economy of various systems, 



220 

 Copper losses, in alternators, 72 



in generators and motors, 45-49, 



57 

 in induction motors, 272, 275, 



284 

 in transformers, 129, 151, 161, 



165, 220-221 

 Core losses, in transformers, 129, 151, 



155-158, 173, 174 

 Cosine method, of measuring power 



factor, 225 



Cotterill, belt losses, 55 

 Counter-electromotive force, in a 

 motor, 28-31, 34, 50 

 in a synchronous motor, 305 

 Crehore, A. C., see Bedell and 

 Cross-magnetizing flux, in alterna- 

 tors, 74, 95 

 in generators, 6 



Current, apparatus for obtaining con- 

 stant, 126 



in a D. C. circuit, 103 

 in an A. C. circuit, 103, 115, 123 

 method of adjustment, 10 

 per phase, 212 

 Currents, addition of alternating, 201- 



202 



Current locus, when resistance is 

 varied in an inductive circuit, 

 123, 125-126, 187, 190-192 

 for induction motor, 278 

 for synchronous motor, 320 

 Current ratio, for converters, 323 

 Cycle, 62 



Damping of hunting in synchronous 



motors, 309 



Delta connection, 197, 206-208 

 Delta voltage, 204 

 Derived neutral, 326 

 Diameter of commutation, 6 



Diametrical 6-phase connection, 211 



Differential generator, characteristics 

 of, 22 



Differential motor, equivalent shunt 



excitation, 59 

 speed and torque of, 36 

 test of, 59 

 uses of, 4 



Direction of rotation, effect on pick- 

 ing up of shunt machine, 15 



Dispersion coefficient, 346 



Double current generators, 322 



Double delta connection of 6-phase 

 circuits, 211 



Double T Connection of 6-phase 

 circuits, 211 



Double transformation, 244 



Drying armature insulation by short- 

 circuit current, 78 



Durand, W. L., on rating of synchro- 

 nous converters, 323 



Dynamo, see Generator 



Dynamotors, 321 



Eddy current loss, in generators and 



motors, 46, 50-53 

 in transformers, 173-176 

 Effective value of a sine wave 105, 



146 

 Efficiency of alternators, 71 



of generators and motors, 41-61 

 of transformers, 166, 178 

 Electrolytic welding, 347 

 Electromotive force, how generated, 



i, 2, 28 

 method of alternator testing, 75, 



80-90 

 methed for synchronous motors, 



306, 316, 320 

 non-sinusoidal, 121, 122 

 of self induction, 107 

 Electromotive forces, addition of, in 



a series circuit, 109, 114 

 addition of, in polyphase circuits, 



199-201, 213-214 

 Electrical degree, 105 

 Equivalent inductance, 119 

 Equivalent reactance, 150 

 Equivalent resistance, 119, 150, 159- 



160, 271, 272 



Equivalent sine wave, 105 

 Equivalent single-phase quantities, 



211-213 



Even harmonics, 342 

 Everest, A. R., on transformer regu- 

 lation, 193 



