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CONTENTS

PAGE

159. The Stanley type of inductor alternator—The Alexanderson
high frequency inductor alternator for frequencies of 100,000
cycles and over.....................279
160. The Eickemeyer type of inductor machine with bipolar field—
The converter from direct current to high frequency alternating
current of the inductor type...............280
161. Alternating current excitation of inductor machine, and high
frequency generation of pulsating amplitude. Its use as
amplifier—Amplification of telephone currents by high fre-
quency inductor in radio communication.........281
162. Polyphase excitation" of inductor, and the induction motor
inductor frequency converter...............282
163. Inductor machine with reversing flux, and magneto communi-
cation—Transformer potential regulator with magnetic com-
mutation .......................284
164. The interlocking pole typo of field design in alternators and
commutating machines.................286
165. Relation of inductor machine to reaction machine—Half syn-
chronous operation of standard synchronous machine as
inductor machine ...................287
CHAPTER XVIII. SURGING OF SYNCHRONOUS MOTORS.
166. Oscillatory adjustment of synchronous .motor to changed con-
dition of load—Decrement of oscillation—Cumulative oscil-
lation by negative decrement...............288
167. Calculation of equation of electromechanical resonance . . . 289
168. Special cases and example................292
169. Anti-surging devices and pulsation of power........293
170. Cumulative surging—Due to the lag of some effect behind its
cause—Involving a frequency transformation of power . . . 296
CHAPTEB XIX. ALTERNATING CUERENT MOTORS IN GENERAL.
171. Types of alternating-current motors............300
172. Equations of coil revolving in an alternating field......302
173. General equations of altemating-curreat motor.......304
174. Polyphase induction motor, equations...........307
175. Polyphase induction motor, slip, power, torque.......310
176. Polyphase induction motor, characteristic constants . . . .312
177. Polyphase induction motor, example...........313
178. Singlephase induction motor, equations..........314
179. Singlephase induction motor, continued..........316
180. Singlephase induction motor, example...........318
181. Polyphase shunt motor, general.............319
182. Polyphase shunt motor, equations...........320
183. Polyphase shunt motor, adjustable speed motor......321
184. Polyphase shunt motor, synchronous speed motor.....323
185. Polyphase shunt motor, phase control by it........324
186. Polyphase shunt motor, short-circuit current under brushes . 327
187. Polyphase series motor, equations............327
188. Polyphase series motor, example . . . f....... . , 330