Design of a universal portable electric drill . o pole motor. The laminations will be punched from Ho. 27 gauge sheet steel v/ith permeability as indicated in Figure 18. Pole are = 1^^^°Teeth per pole = 6 idth 6 teeth = C ^ ^ ib^ -288^6 = .72Core depth = .975 - .144 - .252 = .58 induction in teeth - 110,000 Maximum Induction in core = 90,000 lines per sq, in, Space factor for core iron - .9 Length core = 148 ,U0Q r 2-1/16 110,000 X .72 X .9 Leakage coefficient estimatedLines in yoke = x = in field yoke = 110,uuO MaximumMinimum thickness yoke - 178,UOO 110,
Design of a universal portable electric drill . o pole motor. The laminations will be punched from Ho. 27 gauge sheet steel v/ith permeability as indicated in Figure 18. Pole are = 1^^^°Teeth per pole = 6 idth 6 teeth = C ^ ^ ib^ -288^6 = .72Core depth = .975 - .144 - .252 = .58 induction in teeth - 110,000 Maximum Induction in core = 90,000 lines per sq, in, Space factor for core iron - .9 Length core = 148 ,U0Q r 2-1/16 110,000 X .72 X .9 Leakage coefficient estimatedLines in yoke = x = in field yoke = 110,uuO MaximumMinimum thickness yoke - 178,UOO 110,000 X .9x2x206 .4i56 On the basis of these figures the field lamination is designedas shown in Figure 15. The large air gap in the center of thepole serves to interrupt the path of the armature flux and reducethe reaction and self induction as discussed in Chapter of field turns: (3 = Effective air gap z Of >^ t ~ ^ ^s. (Coefficient to allow for increased reluctanceof air gap due to opening of armature Figure 19.). U. or I. 8. S. FORM 3
Size: 1320px × 1893px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjecttheses, bookyear1920
