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S N S N Pivoted magnet (rotor) Fixed magnet (stator) T
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Figure 177 Alignment action of poles
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Figure 178 depicts a two-pole machine in which the stator poles are constructed in such a way as to project closer to the rotor than to the stator structure This type of construction is rather common, and poles constructed in this fashion are called salient poles Note that the rotor could also be constructed to have salient poles To understand magnetic polarity, we need to consider the direction of the magnetic eld in a coil carrying current Figure 179 shows how the right-hand rule can be employed to determine the direction of the magnetic ux If one were to grasp the coil with the right hand, with the ngers curling in the direction of current ow, then the thumb would be pointing in the direction of the magnetic ux Magnetic ux is by convention viewed as entering the south pole and exiting from the north pole Thus, to determine whether a magnetic pole is north or south, we must consider the direction of the ux Figure 1710 shows a cross section of a coil wound around a pair of salient rotor poles In this case, one can readily identify the direction of the magnetic ux and therefore the magnetic polarity of the poles by applying the right-hand rule, as illustrated in the gure Often, however, the coil windings are not arranged as simply as in the case of salient poles In many machines, the windings are embedded in slots cut into the stator or rotor, so that the situation is similar to that of the stator depicted in
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Cross section of DC machine
Figure 179 Right-hand rule
Figure 178 A two-pole machine with salient stator poles
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Figure 1711 This gure is a cross section in which the wire connections between crosses and dots have been cut away In Figure 1711, the dashed line indicates the axis of the stator ux according to the right-hand rule, indicating that the slotted stator in effect behaves like a pole pair The north and south poles indicated in the gure are a consequence of the fact that the ux exits the bottom part of the structure (thus, the north pole indicated in the gure) and enters the top half of the structure (thus, the south pole) In particular, if you consider that the windings are arranged so that the current entering the right-hand side of the stator (to the right of the dashed line) ows through the back end of the stator and then ows outward from the left-hand side of the stator slots (left of the dashed line), you can visualize the windings in the slots as behaving in a manner similar to the coils of Figure 1710, where the ux axis of Figure 1711 corresponds to the ux axis of each of the coils of Figure 1710 The actual circuit that permits current ow is completed by the front and back ends of the stator, where the wires are connected according to the pattern a-a , b-b , c-c , as depicted in the gure Another important consideration that facilitates understanding the operation of electric machines pertains to the use of AC currents It should be apparent by now that if the current owing into the slotted stator is alternating, the direction of the ux will also alternate, so that in effect the two poles will reverse polarity every time the current reverses direction, that is, every half-cycle of the sinusoidal current Further since the magnetic ux is approximately proportional to the current in the coil as the amplitude of the current oscillates in a sinusoidal fashion, so will the ux density in the structure Thus, the magnetic eld developed in the stator changes both spatially and in time This property is typical of AC machines, where a rotating magnetic eld is established by energizing the coil with an alternating current As we shall see in the next section, the principles underlying the operation of DC and AC machines are quite different: in a direct-current machine, there is no rotating eld, but a mechanical switching arrangement (the commutator) makes it possible for the rotor and stator magnetic elds to always align at right angles to each other
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