. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . descent dynamo of asimilar size are scarcely discernible,and the windings are practicallyidentical, except in the machinesdesigned for special purposes. Fig. 38 shows the complete ty]i(! and general appearanceremain the same up to the loOhorse-power motor, corresponding tothe larger Edison dynamos. Fig. 39 shows the diagram of connec-tions, both of the motor itself andof the rheostat. The speed of themot
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . descent dynamo of asimilar size are scarcely discernible,and the windings are practicallyidentical, except in the machinesdesigned for special purposes. Fig. 38 shows the complete ty]i(! and general appearanceremain the same up to the loOhorse-power motor, corresponding tothe larger Edison dynamos. Fig. 39 shows the diagram of connec-tions, both of the motor itself andof the rheostat. The speed of themotors is very nearly that, of thecorresponding sizes of dynamo ofthe same voltage, and ranges from2,100 revolutions per minute in the\ and ^ horse-power motors, to aslow as 360 in the 150 horse-povrermachine. Fio. 39.—Edison standard motor. Fig. 40 gives a view of the . Standard Crocker- Wheeler motor. The machine is of the inverted horseshoe type ; each pole piece is continuous with its mag-netic core, of soft iron, drop forged exactly to its finished shape. These forgings are fittedinto recesses in the main casting of the motor that forms at once the magnet yoke and the. AUTOMATICSTARTINGRHEOSTAT MOTOBS, ELECTRIC. 551 support for the bearings. The armature is relatively of very large diameter, and, comparedto the field, quite powerful. The armature is a Pacinotti ring with a comparatively smallamount of wire wound upon it. The clearance of the armature is so small that the magneticresistance of the air gap is exceptionally low, and the coils, sunk flush with the surface ofthe armature, are subjected to a very powerful induction. This construction, too, gives
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
