. Design of a direct current generator and switchboard for a farm power plant. of the slot must be twice this plus the insulation(.03 in.) on each side which makes it equal to in. Inorder that the coil may be driven into the slot and thus madeto stick, the slot is made wedge shaped, being in. atthe armature face and in. wide at the bottom. The tooth pitch is SLd * in. Therefore the tooth at the arm-59 ature face is - in. Since the conductors are wound 8 deep the slot depth will be 8 x 0 .083 +• band+ insulation at bottom + insulation
. Design of a direct current generator and switchboard for a farm power plant. of the slot must be twice this plus the insulation(.03 in.) on each side which makes it equal to in. Inorder that the coil may be driven into the slot and thus madeto stick, the slot is made wedge shaped, being in. atthe armature face and in. wide at the bottom. The tooth pitch is SLd * in. Therefore the tooth at the arm-59 ature face is - in. Since the conductors are wound 8 deep the slot depth will be 8 x 0 .083 +• band+ insulation at bottom + insulation at top + .03 insulation between the coils which gives inches. Length of Air Gap:- The ampere turns () for the gap and teeth are usually about l£ times the ampere conductors 472 pel pole. The conductors per pole are —j~ * 118 . And theampere conductors per pole are 118 x 22,7 = 2680. Thereforethe approximate for the gap and teeth are x 2680 =3350. The pole pitch is 6 in. and the tooth pitch is , therefore the teeth per pole are oT532 = 11 #3. Allow for fringing of the flux and call it 13 teeth through which the flux passes. The effective length of the armature, if a 3/16 in, air duct is put in,is .9x5- 3/16 4,313 in, which allows in. for air space between the laminations. This makes the effective area of each tooth x = sq. in. The area of the 13 teeth per pole through which the flux passes is then 13 x 17 sq. in. The total flux being 1,165,000 lines, the flux density in the teeth is 1,165,000 s 63 500 lines per sq. The armature and teeth are to be punched from sheet steel of a thickness of 20 mils, and having the saturation curve as shown by the enclosed iron curves. For the density of 68,500 lines per sq. in., the ampere turns per inch are Therefore the for the teeth are x = Then 3350 - 3342 are the left for the gap. In the formula 0 ,3133J3 1 = A .T., let -13 be the flux
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1912
