. A text-book of electrical engineering;. Fig- 324 due to — . J ampere-turns. The flux which passes to the left of 3 and to theright of 4 links only the coil 2—5, as shown by the dotted lines in the is produced by — . * ampere-turns. If the polar arc is two-thirds of thepole-pitch, the space between holes 3 and 4 covers half the pole face, so that. Fig- 325 Fig. 326 half the pole face is crossed by flux produced by 2 the other half by flux produced by 2p 2p A i ampere-turns Fig. 327I ampere-turns, andTaking the mean value for the whole pole, the armature reaction of a three-phase gen
. A text-book of electrical engineering;. Fig- 324 due to — . J ampere-turns. The flux which passes to the left of 3 and to theright of 4 links only the coil 2—5, as shown by the dotted lines in the is produced by — . * ampere-turns. If the polar arc is two-thirds of thepole-pitch, the space between holes 3 and 4 covers half the pole face, so that. Fig- 325 Fig. 326 half the pole face is crossed by flux produced by 2 the other half by flux produced by 2p 2p A i ampere-turns Fig. 327I ampere-turns, andTaking the mean value for the whole pole, the armature reaction of a three-phase generator is •(155). X^= 1-5-r» ^ -^ It might be objected that we have only considered the conditions existingat the moment represented in the figure. As the pole wheel rotates, however,the current in coil 2—5 decreases and that in coil 3—6 increases, so that thearmature reaction is hardly altered. When the wires 3 and 6 are midway 314 Electrical Engineering between the poles the current in these wires will be at its maximum value,so that the conditions represented in the figure are continually recurring. Asalready mentioned, these results make no claim to mathematical exactness,but merely serve to make the effect of armature reaction as clear as have assumed, so far, that the current lagged 90° behind the ,so that the arma
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