Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . 356 PRACTICAL Fig. 335—Sheet Iron Armature Core Disc. .015-inch thick. creased, and as a result the C2R loss will be increased. There are thus two evil effects of the eddy currents. Eddy current losses may be considerably diminished by building the armature up of a series of thin discs of soft sheet iron or steel, the surfaces of which have been allowed to ox-idize (rust), thus introducing an insulatorbetween the sheets, which decreases theelectrical conducting power of
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . 356 PRACTICAL Fig. 335—Sheet Iron Armature Core Disc. .015-inch thick. creased, and as a result the C2R loss will be increased. There are thus two evil effects of the eddy currents. Eddy current losses may be considerably diminished by building the armature up of a series of thin discs of soft sheet iron or steel, the surfaces of which have been allowed to ox-idize (rust), thus introducing an insulatorbetween the sheets, which decreases theelectrical conducting power of the pieces of tissue paper are inter-posed between the sheets, or brass discsintroduced at intervals to break the con-tinuity of the circuit, and also to affordarmature ventilation. A single sheet ironpunching of a tooth-core ring armature isrepresented in Fig. 335, while the effect oflamination is shown in Fig. 336, in whichthe eddies are confined to each lamination. Only four laminations are purposely shown in the core, in Fig. 336, to magnify the effect. The thickness of the metal from which they are punched may
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1901
