Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 336.—Laminated Armature Core. The thickness of the discs is magnified to show theeddy currents. would result. A simple method ofconstruction is illustrated in Figs. 338, 339, etc. A brass oriron hub of the shape shown in the sectional view, Fig. 338,drilled to receive the armature shaft, is insulated with a sleeve ARMATURES. 357. Fig. 337.—Commutator for a Direct Current Dynamo or Motor. and formed collar made of sheet mica, when it is ready forthe reception of the bars which ar
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 336.—Laminated Armature Core. The thickness of the discs is magnified to show theeddy currents. would result. A simple method ofconstruction is illustrated in Figs. 338, 339, etc. A brass oriron hub of the shape shown in the sectional view, Fig. 338,drilled to receive the armature shaft, is insulated with a sleeve ARMATURES. 357. Fig. 337.—Commutator for a Direct Current Dynamo or Motor. and formed collar made of sheet mica, when it is ready forthe reception of the bars which are forged with grooves inthe ends, as in Fig. 339. The projecting insulated tongue onthe hub fits into a correspondinggroove in a bar, and when all thebars are assembled around the hub,with strips of mica between each,they are locked in place by the pro-jecting insulated V-tongue of awasher screwed upon the hub andbacked up by a lock-nut. A partialsection through the commutator isshown in Fig. 340, in which theheavy line represents the insulation,and from which the manner of locking the bars will be un-derstood. A lug extends at right angles from one end of eachbar to which the armature wire is brushes, copper plated to decreasetheir resistance, are secured in a brush holderand made to press against the commutator byspring pressure. Details of the brush holderare shown in Figs. 304 and 361. The brushholder stud or shaft
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1901
