CH17 - Introduction to Electric Machines

CH17 - Introduction to Electric Machines - G. Rizzoni,...

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Unformatted text preview: G. Rizzoni, Principles and Applications of Electrical Engineering Problem solutions, Chapter 17 1 7 . 1 Chapter 17 Instructor Notes The objective of Chapter 17 is to introduce the foundations for the analysis of rotating electric machines. In Section 17.1, rotating electric machines are classified on the basis of their energy conversion characteristics and of the nature of the electric power they absorb (or generate). Section 17.2 reviews the physical structure of a DC machine and presents a simple general circuit model that is valid for both motors and generators, including dynamic equations. Section 17.3 contains a brief discussion of DC generators. Section 17.4 describes the characteristics of the various configurations of DC motors, both of the wound stator and permanent magnet types. The torque speed characteristics of the different configurations are compared, and the dynamic equations are given for each type of motor. The section ends with a brief qualitative discussion of speed control in DC motors. The second half of the chapter is devoted to the analysis of AC machines. In Section 17.5, we introduce the concept of a rotating magnetic field. The next two sections describe synchronous generators and motors; the discussion is brief, but includes the analysis of circuit models of synchronous machines and a few examples. Circuit models for the induction motor, as well as general performance characteristics of this class of machines are discussed in Section 17.8, including a brief treatment of AC machine speed and torque control. Although the discussion of the AC machines is not particularly detailed, all of the important concepts that a non-electrical engineer would be interested in to evaluate the performance characteristics of these machines are introduced in the chapter, and reinforced in the homework problem set. The homework problems include a mix of traditional electric machinery problems based on circuit models and of more system-oriented problems. Problems 17.24-36 deal with the performance and dynamics of systems including DC motors. These problems are derived from the authors experience in teaching a Mechanical Engineering System Dynamics course with emphasis on electromechanics, and are somewhat unusual (although relevant and useful for nonelectrical engineers) in this type of textbook. These problems are well suited to a more mature audience that has already been exposed to a first course in system dynamics. Problem 17.39 provides a link to the power electronics topics covered in Chapter 12. All other problems are based on the content of the chapter. Learning Objectives 1. Understand the basic principles of operation of rotating electric machines, their classification, and basic efficiency and performance characteristics. Section 1....
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This note was uploaded on 04/08/2009 for the course ELE ELE1403 taught by Professor Khaled during the Spring '09 term at NYU Poly.

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CH17 - Introduction to Electric Machines - G. Rizzoni,...

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