# how to use barcode in rdlc report FIGURE 1641 in Software Drawing PDF417 in Software FIGURE 1641

FIGURE 1641
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* It is desirable to develop a relation between the frequency of the emf generated and the number of revolutions that the pole structure makes Consider an alternator having p poles and making S revolutions per second Each conductor passes through p / 2 cycles of ux per revolution because it takes two poles to make a complete cycle of ux (see Fig 1640) Thus, in 1 s it passes through pS / 2 cycles Consequently pS / 2 cycles per second
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CHAPTER SIXTEEN
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FIGURE 1642
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the second group forms another winding which is known as phase 2 The machine is a two-phase alternator Three-Phase Alternator The three-phase system has come to be almost universally used Let each pole pitch (covering electrical radians; Fig 1641b) be divided into three equal parts such that the points of division are 60 electrical degrees apart Let slots be cut at these points of division, and let insulated conductors be placed in these slots Figure 1641b thus has 12 equidistant slots Divide these slots into three groups by marking them consecutively 1, 3, 2 (not 1, 2, 3) Connect in series all the conductors occupying slots 1 and obtain a winding with the terminals 1 1 Do the same with the conductors occupying slots 2 and slots 3, respectively, and obtain two windings with terminals 2 2 and 3 3 The alternator is then said to be a three-phase alternator having three separate windings interconnected to give three terminals The induced voltages e1 1 , e1 2 , and e3 3 , measured at these terminals, are displaced from each other (in time) by 120 , as shown in Fig 1642b Although alternators are generally constructed three-phase, the reader can see how an electric machine may be wound for any number m of phases by having an independent winding for each phase The conductors constituting these separate windings are generally so displaced in space that there exist 2 / m electrical radians between any two corresponding conductors of two consecutive phases Rotary converters furnish a practical illustration of electric machines built for six or more phases
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56 Direct-Current Generators
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Construction In Sec 53 the statement was made that the relative velocity of the conductor and ux is the cause of emf generation In Sec 54 a machine was described in which the emf is generated by the rotation of the eld structure while the armature (conductor structure) is held stationary Let it now be assumed that the armature structure will revolve while the eld will remain stationary Such a machine is shown in Fig 1643a; the voltage induced in the conductors is a line voltage Commutator Assume that in addition to the rotating armature there is a structure which contains pieces of copper C which are insulated from each other and to which the terminals of the armature coils are connected Such a structure is called a commutator Let stationary brushes be in contact with the commutator As the
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FIGURE 1643 Direct-current generator
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armature revolves, the emf induced in any one coil side changes direction, but since each brush makes contact only with that coil side which is under a de nite pole, the emf at the brush remains constant The net result of such an arrangement is to produce, at any one brush, an emf which is unidirectional, as shown in Fig 1643b Thus the actual emf produced by such a machine is (except for the ripples, which become less pronounced as more conductors are utilized) a dc voltage
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57 Types of DC Generators Alternators require a separate source of direct emf to excite their eld windings This is not true of dc generators, whose eld excitation may be taken directly from the emf generated in the dc machine The methods of connecting the eld winding or windings to the terminal voltage of a machine vary, and this variation gives rise to differing operating characteristics Accordingly, dc generators are divided into the following classes:
1 A shunt generator (Fig 1644a) is one that has its eld winding connected across the armature Its eld strength, therefore, varies with the armature volts Since the IR drop through the generator varies with the load, for a xed position of the eld rheostat the generator will have a drooping voltage curve (see Fig