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discussion of transmission lines, balance three-phase loads and power measurement methods are presented. Chapter 4 develops the theory of the rotating field in the stator and rotor structures of the three-phase induction device. An equivalent circuit is given. Torque vs slip characteristics are derived. Methods for speed control of an induction motor are covered. Then the two-phase induction motor and the single-phase motor are discussed with their applications. Chapters 5 and 6 cover synchronous machines-fundamental concepts and system considerations. In Ch. 5 the equivalent circuit of the synchronous generator is derived. Phasor diagram analysis under unity power-factor, lagging and leading power-factor is given. Similarly, the equivalent circuit of the synchronous motor is derived and phasor diagram analysis is given. Real and reactive power vs powerangle characteristics are discussed. Applications of balanced three-phase and two-phase synchronous devices are covered. The single-phase, reluctance-type and hysteresis-type synchronous devices are included. This book is unique in adopting the system point of view in the study of rotating machines-energy converters. In Ch. 6, dynamic analysis of synchronous machines connected to an infinite bus is made using linear and nonlinear analysis (Cases 1 and 2). The solution of the swing equation is given. Balanced, three-phase, salient-pole machines are then analyzed. Three-phase faults involving constant-reactance and variablereactance techniques are considered. The last chapter deals with parameter measurement of three-phase synchronous machines. In the salient-pole machine, both direct axis and quadrature axis reactances X, and X, must be measured. For transient studies, Xi, Xi, Xh and Xi must also be measured. Special effort is made to familiarize the reader (or student) with the technique of measuring the time constants associated with the dynamic modeling of synchronous devices.

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Book Review The book has 5 appendices: A. Frequency-domain analysis ; B. Instrumentation; C. Stability theory; D. Definitions and theorems ; and E. Solid state power electronics : The silicon controlled rectifier (SCR) or thyristor. Appendix E is worth reading. There are many figures, diagrams and pictures, as well as numerical examples. It can be suitably used in a senior course for electrical and system engineers. The author had refrained from introducing more theoretical and mathematical material into this textbook. For example, there is only one brief mention of Kron’s primitive machine but no mention of “diakoptics” or “tensor analysis”. The author did a re-

markable essay on this reviewer’s “Collected Papers” (see J. Franklin Inst., Vol. 297, No. 2, 1974). However, he did not mention the “revolving-field theory” of synchronous machines and the “forward and backward components” parallel to the “two-reaction theory” and the “direct and quadrature components”. We regret very much the passing of Professor Mabelkos; however, this remarkable book will live as a memorial to him by his friends and colleagues. Y. H. Ku Moore School of Electrical Engineering University of Pennsylvania Philadelphia, PA 19104, U.S.A.

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of the Franklin Institute Pergamon Press Ltd.

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