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Introduction to Electric Machines
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he objective of this chapter is to introduce the basic operation of rotating electric machines The operation of the three major classes of electric machines DC, synchronous, and induction will rst be described as intuitively as possible, building on the material presented in 16 The second part of the chapter will be devoted to a discussion of the applications and selection criteria for the different classes of machines The emphasis of this chapter will be on explaining the properties of each type of machine, with its advantages and disadvantages with regard to other types; and on classifying these machines in terms of their performance characteristics and preferred eld of application 18 will be devoted to a survey of special-purpose electric machines many of which nd common application in industry such as stepper motors, brushless DC motors, switched reluctance motors, and single-phase induction motors Selected examples and application notes will discuss some current issues of interest By the end of this chapter, you should be able to:
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Describe the principles of operation of DC and AC motors and generators Interpret the nameplate data of an electric machine Interpret the torque-speed characteristic of an electric machine Specify the requirements of a machine given an application
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17
Introduction to Electric Machines
ROTATING ELECTRIC MACHINES
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The range of sizes and power ratings and the different physical features of rotating machines are such that the task of explaining the operation of rotating machines in a single chapter may appear formidable at rst Some features of rotating machines, however, are common to all such devices This introductory section is aimed at explaining the common properties of all rotating electric machines We begin our discussion with reference to Figure 171, in which a hypothetical rotating machine is depicted in a cross-sectional view In the gure, a box with a cross inscribed in it indicates current owing into the page, while a dot represents current out of the plane of the page In Figure 171, we identify a stator, of cylindrical shape, and a rotor, which, as the name indicates, rotates inside the stator, separated from the latter by means of an air gap The rotor and stator each consist of a magnetic core, some electrical insulation, and the windings necessary to establish a magnetic ux (unless this is created by a permanent magnet) The rotor is mounted on a bearing-supported shaft, which can be connected to mechanical loads (if the machine is a motor) or to a prime mover (if the machine is a generator) by means of belts, pulleys, chains, or other mechanical couplings The windings carry the electric currents that generate the magnetic elds and ow to the electrical loads, and also provide the closed loops in which voltages will be induced (by virtue of Faraday s law, as discussed in the previous chapter) Basic Classi cation of Electric Machines An immediate distinction can be made between different types of windings characterized by the nature of the current they carry If the current serves the sole purpose of providing a magnetic eld and is independent of the load, it is called a magnetizing, or excitation, current, and the winding is termed a eld winding Field currents are nearly always DC and are of relatively low power, since their only purpose is to magnetize the core (recall the important role of high-permeability cores in generating large magnetic uxes from relatively small currents) On the other hand, if the winding carries only the load current, it is called an armature In DC and AC synchronous machines, separate windings exist to carry eld and armature currents In the induction motor, the magnetizing and load currents ow in the same winding, called the input winding, or primary; the output winding is then called the secondary As we shall see, this terminology, which is reminiscent of transformers, is particularly appropriate for induction motors, which bear a signi cant analogy to the operation of the transformers studied in s 7 and 16 Table 171 characterizes the principal machines in terms of their eld and armature con guration It is also useful to classify electric machines in terms of their energyconversion characteristics A machine acts as a generator if it converts mechanical energy from a prime mover eg, an internal combustion engine to electrical form Examples of generators are the large machines used in power-generating plants, or the common automotive alternator A machine is classi ed as a motor if it converts electrical energy to mechanical form The latter class of machines is probably of more direct interest to you, because of its widespread application in engineering practice Electric motors are used to provide forces and torques to generate motion in countless industrial applications Machine tools, robots, punches, presses, mills, and propulsion systems for electric vehicles are but a few examples of the application of electric machines in engineering
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