Design of a universal portable electric drill . U. or I. 8. S. FORM 3. 36 TTr = ~~ = .471 15 i?s= .141 Q> = ,015 - .471 .016 X / or- .471 - .81 X . X = .0198 Area air gap = x = sq. inches. 148,000 X .0198 A. T. air gap = .313 x = 19E iron caleulated on the basis of induction c-urve > igure 18and 2-1/16 of laminations designed as shown in Figure 15 = total ampere turns will therefore be about 400 which at fiveamperes means 80 turns on each field coil. Ho. 21 wirewill be used. The mean turn of the armature coils will be lo
Design of a universal portable electric drill . U. or I. 8. S. FORM 3. 36 TTr = ~~ = .471 15 i?s= .141 Q> = ,015 - .471 .016 X / or- .471 - .81 X . X = .0198 Area air gap = x = sq. inches. 148,000 X .0198 A. T. air gap = .313 x = 19E iron caleulated on the basis of induction c-urve > igure 18and 2-1/16 of laminations designed as shown in Figure 15 = total ampere turns will therefore be about 400 which at fiveamperes means 80 turns on each field coil. Ho. 21 wirewill be used. The mean turn of the armature coils will be longwhich will give an armature resistance of30 X 12 X X .0257 ohms at 25°C. 4 X 12 The field resistance may be calculated in a similar manner. Thefield coil will be wound on a rectangular form with a centerblock 2-1/8 X 7^ and will be placed on the field core by-crossing it like a figure eight, and folding it back on mean turn will be and the resistance per coil:40 X X .0128 = .76 ohms at 25° C. 12 The total resistance of the machi
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttheses, bookyear1920
