Transcription of Introduction to Rotating Machines
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Introduction to Rotating Machines
CHAPTER Introduction to Rotating Machines T he object of this chapter is to introduce and discuss some of the principles underlying the performance of electric machinery. As will be seen, these prin- ciples are common to both ac and dc Machines . Various techniques and approx- imations involved in reducing a physical machine to simple mathematical models, sufficient to illustrate the basic principles, will be developed. ELEMENTARY CONCEPTS Equation , e = d)~/dt, can be used to determine the voltages induced by time- varying magnetic fields. Electromagnetic energy conversion occurs when changes in the flux linkage ~. result from mechanical motion. In Rotating Machines , voltages are generated in windings or groups of coils by Rotating these windings mechanically through a magnetic field, by mechanically Rotating a magnetic field past the winding, or by designing the magnetic circuit so that the reluctance varies with rotation of the rotor.
4.2 Introduction to AC and DC Machines 177 ~ld nding Flux paths Figure 4.4 Schematic view of a simple, two-pole, single-phase synchronous generator. to have the single, low-power field winding on the rotor while having the high-power, typically multiple-phase, armature winding on the stator.
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