. 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. Fig. 1,395.—Western Electric stationary armature andframe of engine driven alternator. It is of cast ironand surrounds the laminated iron core in which thearmature windings are embedded. Heavy steel clamp-ing fingers hold the core punchings in place and nu-merous ventilating ducts are provided in the core atfrequent intervals to allow free circulation of co
. 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. Fig. 1,395.—Western Electric stationary armature andframe of engine driven alternator. It is of cast ironand surrounds the laminated iron core in which thearmature windings are embedded. Heavy steel clamp-ing fingers hold the core punchings in place and nu-merous ventilating ducts are provided in the core atfrequent intervals to allow free circulation of cool armature coils are form wound, insulated, andretained in the core slots by means of wedges. 1,150 HAWKINS ELECTRICITY Inductor Alternators.—In this class of alternator botharmature and field magnets are stationary, a current beinginduced in the armature winding by the action of a so calledinductor in moving through the magnetic field so as to periodicallyvary its MAIN CIRCUIT TO EXCITER MAIN CIRCUIT TO EXCITER FlG. and 1,397.—Elementary inductor alternator; diagram showing principle ofoperation. It consists of a field magnet, at the polar extremities of which is an armaturewinding both being stationary as shown. Inductors consisting of iron discs are arrangedon a shaft to rotate through the air gap of the magnet poles. Now in the rotation of theinductors, when anyone of them passes through the air gap as in fig. , the reluctance ormagnetic resistance of the air gap is greatly reduced, which causes a corresponding in-crease In the number of magnetic lines passing through the armature winding. Again asan inductor passes out of the air gap as in fig. 7. the number of magnetic lines is greatlyreduced; that is, when an inductor is in the air gap, the magnetic field is dense, and whenno inductor is in the gap. the is weak: a variable flux is thus made to pass through thearmature winding, inducing current therein. The essentia
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