The 7th edition of Fitzgerald and kingsley's electric machinery by Stephen umans is developed recognizing that the strength of this classic textbook since the first edition has been its emphasis on building an understanding of the fundamental physical principles underlying the performance of electric machines. Much has changed since the publication of the first edition due to the development of new grades of electrical Steel, new insulation materials, superior permanent-magnet materials, the introduction of power-electronic drives and controls, and the widespread availability of computers and numerical software which greatly increases the capability to apply analytical techniques to the analysis of electric machines. Yet the basic physical principles remain the same and this seventh edition is intended to retain the focus on these principles in the context of todays technology.Chapter includes Quantitative examples to illustrate important concepts. Practice problems with solutions are providedœ” a list of variables and their definitions has been included at the end of each br>Chapterœ” the presentation of all material in the book has been carefully reviewed and revised as needed for additional clarity.œ” 15 New examples have been added to this edition, bringing the total number of examples in the book to 111œ” there are 96 New end-of-chapter problems for a total of 371 problems in this edition. Almost all of the remaining problems, although retained in form from the previous edition, have been alteredœ” the seventh edition introduces some simple examples of electric-machinery dynamics and includes a few MATLAB/Simulink examples and problems.