290 



INDEX 



Regulation of alternators and transformers, 



151 ; of rotary converters, 255 

 Repulsion motor, 25, 279 

 Resistance measurements, 163; resistance 



of alternator armature, 152 ; equivalent 



resistance of transformer, 152 

 Resonance, 14 

 Retardation method of determining losses, 



174 



R m.s. value, 2, 6 

 Rotary converter, 81, 236; starting of, 



257 ; rotary synchronizer, 142 

 Rotating magnetic field, 31, 41; rotating 



vector, 4 

 Rothert, ampere-turn method of pre-deter- 



mining regulation of alternator, 156 

 Rotor, 36 ; eccentricity, 126 ; voltage at 



starting, 120; windings, 117 

 Routin, retardation method of finding 



losses, 174 



S 



Samojloff, measurement of slip, 209 

 Schiller motor, 285 

 Scott, phase transformation, 113 

 Self-inductance, 8, 9 ; effect of, in watt- 

 meter, 45 



Separation of core losses, 169 

 Series arrangement of impedances, 17 ; 

 series single-phase commutator motor, 

 272 



Shaded-pole motor, 25 

 Short-circuiting gear for rotors, 121 ; 



short-circuit test, 152, 172, 200 

 Siemens and Halske synchronizer, 146 

 Sine wave, 3, 9 



Single-phase commutator motors, 271 ; 

 single-phase converter, heating of, 241 ; 

 single-phase induction motor, 228 

 Skewed pole-shoe, 86 

 Skin effect, 27 

 Slip of induction motor, 115, 125, 191, 202 ; 



measurement of, 208 

 Soames testing brake, 204 

 Speed control, of compensated induction 



motor, 263 ; of induction motor, 225 

 Squirrel-cage rotor, 116 

 Stability of synchronous motor, 128 

 Star connection for transformers, 111 ; for 



three-phase circuits, 34 

 Starting resistances for induction motors, 

 120, 196, 218 ; starting of rotary con- 

 verters, 257 ; of single-phase induction 

 motors, 234; of synchronous motors, 

 138 ; starting torque of induction motor, 

 116,217 



Stationary wave of magnetic flux, 39 

 Stator, 36" 

 Step-down and step-up transformers, 102 



Stroboscopic methods of determining slip 

 of induction motor, 208 



Sumpner, transformer efficiency test, 167; 

 efficiency test of induction motor, 212 



Surging of synchronous motor, 137 



Synchronization, 139, 140 ; synchronizers, 

 140; synchronous motor, 127 ; V-curves 

 of, 133 ; condenser action of, 134 ; syn- 

 chronous motor as compensator for watt- 

 less currents, 134 



Syutony. 14 



T 



Tandem connection of induction motors, 

 226 



Tangent formula for power factor, 56 



Temperature rise in alternator, 175 ; in 

 transformer, 170 



Thickness of alternator core sheets, 83; 

 of transformer core sheets, 106 



Thomson, E., electromagnetic repulsion 

 experiments, 25 



Three-phase currents, 29 ; three-phase 

 circuits, power measurement in, 51, 57 ; 

 vector diagram of, 54 ; three-phase syn- 

 chronizer, 146 ; transformers, 104 



Torque of induction motor, 116, 124, 185, 

 191, 201, 217 



Transformers, 100 ; best dimensions of 

 core, 109 ; efficiency tests, 167 ; heating 

 tests, 170 ; three-phase transformers, 

 112; mesh v. star connection, 111 ; three- 

 phase i'. single-phase, 111 



Triangle coupling of three-phase circuits, 

 35 



Turbo-alternator, 87 



Two-phase currents, 29; power measure- 

 ment in two-phase circuits, 51 



Two-wattmeter method of measuring 

 power, 52 



U 



Unit of inductance, 9 



V-curves of synchronous motor, 133 



Vector diagram, 4 ; of induction motor, 

 187; of loaded paralleled alternator, 

 149; of synchronous motor, 129; of 

 three-phase circuit, 54 



Ventilating ducts in alternator armature, 

 84 



Voltage of rotor windings, 120 ; voltage 

 ratio in converters, 237 ; voltage regu- 

 lation of converters, 255 



Voltmeters, 63 ; methods of extending 

 range of, 66 



