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เนื้อหาย่อ : The exciting new sixth edition of Electric Machinery has been extensively updated while retaining the emphasis on fundamental principles and physical understanding that has been the hallmark of this classic textbook. This text is intended to serve as an introduction to electric machinery and electromechanics and has been expanded to include an introduction to power electronics and machine control. It is suitable for use at the upper-level undergraduate level as well as in introductory graduate courses. Key Features of This Book Each chapter includes quantitative examples to illustrate important concepts. Practice problems with solutions accompany many of the examples for further reinforcement. These features have been clearly illuminated through the design to make it easy for both instructors and students to locate them. A new chapter on power electronics intro- duces the basic components of power electronics as well as typical circuit configu- rations for rectification and inversion that are found in modern motor drives. A new chapter on speed and torque control of dc and ac motors has also been added. This chapter introduces the basic concepts of motor drives for dc and ac machines and includes a discussion of the technique of field- oriented control, which is widely used in modern drive systems. The chapter on single- and two-phase motors now includes a generalized analytical formula- tion for unsymmetrical two-phase induction machines. This formulation is then applied to the general case of a single-phase induction motor running off both its main and auxiliary winding. This formulation is unique to Electric Machinery and is not found in other textbooks. The popular interactive computer software MATLABe, has been introduced in this new edition in both examples and practice prob- lems. In addition, chapter-ending problems have been added which specifically require the use of MATLAB. An icon has been placed in the margin to indicate those places where MATLAB is used. Website The book's website, www.mhhe.com/umans, includes a downloadable version of the solutions manual (for instructors only). The website will also serve as a source for additional examples, problems, and MATLAB examples, as well as PowerPoint slides of figures from the book.