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Analysis of Electric Machinery and Drive Systems
Those familiar with previous editions of this book will find that this editions has been expanded and modified to help meet the neds of the electric machinery, electric drives, and electric power industries.rnLike previous editions, reference frame theory is at the core of this book. However, new material has been introduced that sets the stage for machine design. In particular, in Chapter 2, the winding function approach is used to establish the rotating air gap magnetotomative force and machine inductances, including end turn winding effects. In addition, an introduction to machine design is set forth in Chapter 15. These two new chapters, combined with reference frame theory based machine analysis, add a significant dimension not found in other texts.rnAnother major change is set forth in Chapter 8, wherein the standard linear and reduced order machine equations are derived and a section has been added on the method of analysis reffered to as voltage behind reactance. This new formulation of the machine equations is specially useful in the analysis and modeling of electric machines that are coupled to power electronic circuits. Consequently, this technique has become a useful tool in the electric power and electric drives industries.rnThere are other, less major, changes and additions in this edition that warrant mentioning. In Chapter 1, electromagnetic force (torque) equations are derived without the need of numerous, involved summations that have plagued the previous approach. This straightforward approach is made possible by the identification of a second energy balance relationship. Also, the chapter on reference frame theory has been augmented with transformations that apply when the three phase currents, currents, and flux linkages sum to zero. Although this is not the case if a third harmonic is present, it is quite common, and the transformations are helpful in cases where the neutral is not accessible, and only the line to line voltages are available.rnCalculation of operational impedances is given in Chapter 7. Added to this material is a generalized approach of determining machine parameters from machine measurements. An interesting combination of Park's approach to the derivation of the torque relationship and reference frame theory is set forth in Chapter 6.rnIn the previous editions the synchronous machine was analyzed assuming positive current out of the machine, convinient for the power system engineer. Unfortunately, this approach is somewhat frustrating to the electric drives engineer. The chapter on synchronous machines has been modified in an attempt to accommodate both drive and power system engineers. In particular, the analysis is first carried out with positive currents into the machine and then with the current direction revered. rnHowever, whenever power system operation or system fault studies are considered, positive current is assumed out of the machine consistent with power system convention. The remaining chapters, including the chapters on electric drives, as well as the chapters on converters, have been updated to include recent advances in analysis and converter control. Also, the analysis of unbalanced operation covered in the first edition but not in the second, has been simplified and is presented in Chapter 9.rnNow in a fully revised and expanded edition, this widely used reference on machine analysis boasts many changes designed to address the varied needs of engineers in the electric machinery, electric drives, and electric power industries. The authors draw on their own extensive research efforts, bringing all topics up to date and outlining a variety of new approaches they have developed over the past decade.rnFocusing on reference frame theory that has been at the core of this work since the first edition, this volume goes a step further, introducing new material relevant to machines design along with numerous techniques for making the derivation of equations more direct and easy to use.rnCoverage includes:rn• Completely new chapters on winding functions and machine design that add a significant dimension not found in any other textrn• A new formulation of machine equations for improving analysis and modeling of machines copied to power electronic circuitsrn• Simplified techniques throughout, from the derivation of torque equations and synchronous machine analysis to the analysis of unbalanced operationrnA first rate resource for engineers wishing to master cutting edge techniques for machine analysis. Analysis of Electric Machinery and Drive Systems is also a highly useful guide for students in the field.
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