Principles of Electrical Design D C And a C Generators
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Items (22), (23) and (24): Dimensions of Air Gap. * = = 786 gq cm B g 8, 000 = 122 sq. In. whence l a = 12 Ki = 11. 1, and the axial length of pole face will be something less, or (say) 10. 6, to avoid the large amount of flux which would otherwise curve round into the flat surface of the core discs, where it would cause eddy currents. These axial dimensions, both of armature and pole shoe, are, however, sub- ject to correction after the actual winding details have been settled; because the pra...ctical considerations may lead to a change in the number of inductors (Z), and a corresponding change in the amount of flux entering the armature. PROCEDURE IN DESIGN OF D. C. GENERATOR 207 Item (25): Cross-section of Armature Conductors. By formula (51), page 97. QQ \ whence area of cross-section = ' 7 . = 0. 0402 sq. In. Z, (Ji O Items (26) to (31): Conductor and Slot Dimensions. It is neces- sary to find by trial the best arrangement of slots and conductors to provide approximately 350 inductors (item (16)).
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