The book Electrical Engineering First Course was written by author Ernst Julius Berg Here you can read free online of Electrical Engineering First Course book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Electrical Engineering First Course a good or bad book?
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This number serves as a good preliminary value. Actually, 28 turns per pole per phase were chosen. Conductors per pole and phase are then 2 X 28 = 56. The number of slots per pole per phase depends primarily on the armature circumference and the slot pitch. With many slots, a smoother e. M. F. Wave is generally obtained. The number of slots is also usually greater in low voltage machines, where the requirements of higher insulation are not so severe. Practically, at least two slots per pole per... phase are used. DESIGN CONSTANTS OF ALTERNATORS 291 From Table IX, the armature diameter per pole is found to be 3 in. Hence the diameter is 3 X 8 = 24 in. And the circum- ference is TT X 24 = 75. 5 in. The slot pitch may be determined for different numbers of slots per pole per phase, as follows: Slots per pole per phase . . 1 O 3 4 Slots per pole 3 6 9 12 18 Slots 24 48 72 144 Ql/^j. . -. ;. *. ^U / *"" \ : r . /, Vioe; 31 A blot pitcn 1, , i in incnes . 1* . 57 . 05 . 785 0. 524 About half of the slot pitch will be required for the tooth.
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