CH16 - Principles of Electromechanics

CH16 - Principles of Electromechanics - G. Rizzoni,...

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G. Rizzoni, Principles and Applications of Electrical Engineering Problem solutions, Chapter 16 1 6 . 1 Chapter 16 Instructor Notes The last part of the book presents an introduction to electro-magneto-mechanical systems. Some of the foundations needed for this material (AC power) were discussed in Chapter 7; the polyphase AC power material in Chapter 7 may be introduced prior to covering Chapter 17, or together with the AC machine material of Chapter 17. The emphasis in this chapter (and the next two) is on preparing the student for the use of electro- magneto-mechanical systems as practical actuators for industrial applications. Thus, more emphasis is placed on describing the performance characteristics of linear motion actuators and of rotating machines than on a description of their construction details. The material in Chapters 16-18 has been used by several instructors over the last several years in a second (quarter-length) course in system dynamics (System Dynamics and Electromechanics) designed for mechanical engineering juniors. Section 16.1 16 reviews basic laws of electricity and magnetism, which should already be familiar to the student from an earlier Physics course. The box Focus on Measurements: Linear Variable Differential Transformer (pp. 795-796) presents an example related to sensors with a discussion of the LVDT as a position transducer. Section 16.2 discusses approximate linear magnetic circuits and the idea of reluctance, and introduces magnetic structures with air gaps and simple electro-magnets. The box Focus on Methodology: Magnetic Structures and Magnetic Equivalent Circuits (p. 804) summarizes the analysis methods used in this section. A magnetic reluctance position sensor is presented in Focus on Measurements: Magnetic Reluctance Position Sensor (pp. 811-812) and Focus on Measurements: Voltage Calculation in Magnetic Reluctance Position Sensor (pp. 812-814). The non-ideal properties of magnetic materials are presented in Section 16.3, where hysteresis, saturation, and eddy currents are discussed qualitatively. Section 16.4 introduces simple models for transformers; more advanced topics are presented in the homework problems. Section 16.5 is devoted to the analysis of forces and motion in electro-magneto-mechanical structures characterized by linear motion. The boxes Focus on Methodology: Analysis of Moving-Iron Electromechanical Transducers (pp. 823-824) and Focus on Methodology: Analysis of Moving-Coil Electromechanical Transducers (p. 836) summarize the analysis methods used in this section. The author has found that it is pedagogically advantageous to introduce the Bli and Blu laws for linear motion devices before covering these concepts for rotating machines: the student can often visualize these ideas more clearly in the context of a loudspeaker or of a vibration shaker. Example 16.9 (pp. 824-825) analyzes the forces in a simple electromagnet, and Examples 16.10 (pp. 825-827) and 16.12 (p.831) extend this concept to a solenoid and a relay. Example 16.11 (p. 827-828) ties the material presented in this chapter to the transient analysis topics of Chapter 5. Example 16.13 (pp. 836-839) performs a dynamic analysis of a
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CH16 - Principles of Electromechanics - G. Rizzoni,...

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