None
Maurice, 14 on oscillations, 131 starting method, 113 Length of air-gap, 164 Limit-circle of current, 37 Line of equal power occurring with constant excitation, 36 Lines of equal phase, 36, 47 M Measurement of efficiency, 134 Mordey alternators, 38, 47, 53 N Notation, 172 , for study of operation, 31 Numerical examples, 53, 69, 75, 84, 88 O Observations on the E. M. F., induced at the poles, 108 Oerlikon type of motor, 133 Operation of a motor with constant excitation, 49 with constant excitation, 100 Operations, factors determining the practical condition of, 1 76 Operative conditions, representation of, 20 Oscillations, damping of, 126 of converters connected in parallel, 220 of synchronous motors, 122 long-period, 130 Outputs, comparison of, 62 Overrating of motor-generator sets to improve power-factor, 288 294 INDEX Parallel working of rotary converters, 219 Perot, M., 103 Phase-angle, determining, 139 -converters, 224 indicators, 108 Picon, M. R. xix Synchronism, 107 Synchronous and induction motors, comparison between, 90 operation, stability of, u motors with alternating fields, 145 Symmetrical polyphase motors, case of, 19 Three-part pole, 232 Transverse reaction, method of deter- mining, 279 Two-part pole, 234 Unequal electromotive forces, case of, 7 Tap voltage, 231 Table, empirical coefficients, 255, 258, 259 motors of the Societe 1'Eclairage Electrique, 5 numerical example, 78 saving in cost of equipment, 76 in operating cost, 77 single-phase and three-phase syn- chronous motors of American manufacture, 285, 286 theoretical coefficients, 263 Tesla starting method, 113 Testing alternators, 270 Theoretical coefficients, 263 comparison with, 261 form of V-curves, 59 Theory, analytical, of synchronous motors, 15 Thompson, Prof. S. P., 64 Value of current-supply voltage, 183 of reactance, 183 Variation of voltage by the split pole, 225 Variations of stability with operating conditions, 52 V-curves, 56 for constant potential, 200 predetermination of, 57 theoretical form of, 59 Voltage regulation by varying the reactance X in the current, 211 of at terminals, 189, 190 variation by the split pole, 225 W "Watted" current, 34 Wave-form of E. M. F., influence of, 102 ? 3' 1 z a £»T3 «8 2 S S ® S 0> KT o-o II el > . 8 f 01 o 3 A 179 HAND BOUND UNIVERSITY OF TORONTO. 