. The principles underlying radio communication . Fig. 101-A-B (C andKVA., 900-R. P. M. 1. Stator frame. 2. Complete rotor. 3. Shields. 4. Journal boxes. 5. Oil rings. 6. Stator winding. 7. Statorleads. 8. Cable tips for leads. D on opposite page).—Alternating-current generator, 150, 60-cycle. Single phase. Dismantled parts listed below. 9. Oil gauge. 10. Oil hole cover. 11. Shaft. 12. Pole shoe. 13. Collector ring. 14. Field coil. 15. Cap screws for holding shields to frame. 16. Journal box set screw. 17. Twin unit brush holder, with brushes. 18. Dust cap. 19. Dust washefr. 20. Rotor leads. 2
. The principles underlying radio communication . Fig. 101-A-B (C andKVA., 900-R. P. M. 1. Stator frame. 2. Complete rotor. 3. Shields. 4. Journal boxes. 5. Oil rings. 6. Stator winding. 7. Statorleads. 8. Cable tips for leads. D on opposite page).—Alternating-current generator, 150, 60-cycle. Single phase. Dismantled parts listed below. 9. Oil gauge. 10. Oil hole cover. 11. Shaft. 12. Pole shoe. 13. Collector ring. 14. Field coil. 15. Cap screws for holding shields to frame. 16. Journal box set screw. 17. Twin unit brush holder, with brushes. 18. Dust cap. 19. Dust washefr. 20. Rotor leads. 21. Rotor lead cable tips. 22. Brush stud. THE ALTERNATOR. 161. 70. Magnetic Circuit.—It is important to get an understand-ing of the magnetic path in an electric machine. Various shapesare possible, but an understanding of one makes all others 100 is a diagram indicating the parts of a typical mag-netic circuit, with their names. It is not intended to showdetails of mechanical construction. The fine lines in the upperpart of the figure show the path of the magnetic flux for one 162 DYNAMO-ELECTRIC MACHINERY. pair of poles. The paths for the other poles are similar. Thearmature conductors are placed in the slots ss. 71. Field Excitation.—Thus far nothing has been said as tohow the magnetic field is produced. While permanent mag-nets might be used, they are not satisfactory for practicalpurposes, except in the very little machines called mag-netos. Electromagnets are therefore used. The poles arefitted with coils or spools of wire, usually of a large number ofturns, through which direct current is sent from some externalsource. The co
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