4 ELEMENTS OF ELECTRICAL ENGINEERING. 



wires which are placed in slots around the inner periphery of a 

 ring-shaped structure of laminated iron AA. Figure 4 shows 

 sixteen armature slots in each of which four wires are placed. 



Fig. 5. Revolving-armature alternator with belted exciter. 



In the revolving field type of alternator, the direct current for 

 exciting the revolving field magnet is delivered to the rotating 

 structure by brushes which rub on two insulated metal rings ; and 



Fig. 6. Revolving-field alternator with direct-connected exciter. 



the terminals of the stationary armature winding are connected 

 directly to the receiving circuit. 



