. A text-book of electrical engineering;. Fig. 287 Fig. 288 pitch. In Fig. 285, for example, the wire passes up slot i from back tofront, and then down slot i from front to back, and so on. When this coilis completely wound, we pass to the coil 2, 2 by means of the dotted con-nection at the back end of the armature. The internal pole machine (Fig. 289) is strikingly simple both in prin-ciple and construction, and is the type almost universally adopted. Theexternal and stationary armature is built up of sheet-iron Fig. 289Three-phase generator of the Society Electricity et Hydrauliq
. A text-book of electrical engineering;. Fig. 287 Fig. 288 pitch. In Fig. 285, for example, the wire passes up slot i from back tofront, and then down slot i from front to back, and so on. When this coilis completely wound, we pass to the coil 2, 2 by means of the dotted con-nection at the back end of the armature. The internal pole machine (Fig. 289) is strikingly simple both in prin-ciple and construction, and is the type almost universally adopted. Theexternal and stationary armature is built up of sheet-iron Fig. 289Three-phase generator of the Society Electricity et Hydraulique, Charleroi. secured in a cast-iron frame. The winding is carried in slots or tunnels onthe inner surface of the annular ring. These slots are hned with insulatingmaterial, micanite in machines for high pressures, and leatheroid, or someother such material, in low-pressure machines. The winding is similar tothe ordinary drum windings, or like that shown on the rotating armaturein Fig. 285, but here the ends are brought out to fixed terminals, so that thecollection of current at high pressures by means of slip rings is poles, which are alternately north and south, are fixed on the periphery 90. Types of Alternating Current Generators 293 of a flywheel, which rotates within the armature. The magnetising windingon the poles consists either of insulated wire or of bare copper strip woundon edge, with a thin layer of insulation between successive turns. Theexciting current is supphed by a direct-current dyna
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