. Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise. ield, or 2. To weaken the field. These disturbing fluxes form, in part, stray fluxes linked around thearmature inductors tending to choke the armature current. Ques. Explain how the field becomes distorted byarmature reaction. Ans. Considering a slotted armature and analyzing theelectrical conditions as the inductors move past a pole piece, itwill be observ
. Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise. ield, or 2. To weaken the field. These disturbing fluxes form, in part, stray fluxes linked around thearmature inductors tending to choke the armature current. Ques. Explain how the field becomes distorted byarmature reaction. Ans. Considering a slotted armature and analyzing theelectrical conditions as the inductors move past a pole piece, itwill be observed: 1, when the coil is in the position shown in ALTERNATORS 1,161 fig. 1,411, the current will be zero, assuming no armature self-induction, consequently for this position the armature coil hasno disturbing effect upon the field set up by the field magnet;2, when the inductors have moved under the pole face, as infig. 1,412, currents will be induced in them, and they will tendto set up a magnetic field as indicated by the dotted lines, andin direction, by the arrow heads. The effect of this field will beto distort the main field, strengthening one side of the pole andweakening: the other side. <^C!inTi CURRENTNOT YETCOME TO REST. CURRENT INARMATURE COILSINDUCES REVERSEFIELD INTEETH Tig. —Section of armature and field showing weakening effect of armature reaction inthe field. Self-induction being present (as it almost always is), the current lags more orless behind the pressure, so that when the coil is in the position of zero induction, as shown,the current has not yet come to rest. Accordingly, lines of force (indicated by the dottedlines) are set up by the current flowing through the coils which are in opposition to thefield, thus weakening the latter. The dots and crosses in inductor sections, have theirusual significance in defining the direction of current, representing respectively the headsand tails of arrows. Ques. Explain how the field becomes weakened byar
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