Question: A 250-V, 4-pole, wave-wound d.c. series motor has 782 conductors on itsarmature. It has armature and series field resistance of 0.75 ohm. The motor takesa current of 40 A. Estimate its speed and gross torque developed if it has a flux per pole of 25 mWb Answer: Step 1 Mechanical Engineering homework question answer, step 1, image 1 Mechanical Engineering homework question answer, step 1, image 2 Step 2 Mechanical Engineering homework question answer, step 2, image 1 Step 3 Mechanical Engineering homework question answer, step 3, image 1

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E = 200 Gpa = 20 times 10^5 mpa I = 500 times 10^6 mm^4 Bending moment due to applied loading (moments are taken as positive when they cause tension in bottom, fiber) There moment Eqn: ML(l_L/I_L) + 2M_c[l_L/I_L + R_R/I_R] + M_R(l_R/I_R) = -6 A_r x_R/I_r R_R-6 A_L x_L/I_L l_L A_l, A_r: Are of bending moment diagram due to applied loads on left & right support respectively \r\n x_L, x_R: C.G of respective areas from left & right support respective for spam ABC A_L = 2/3 times 8 times 320 = 1706.7 A_R = 2/3 times 320 = 1706.7 x_1 = 4, x_R = 4 \r\n for span ABC A_l = 2/3 times 320 times 8 = 5120/3 = A_R x_L = x_R = 4 Using 3-moment theorm: therefore 0 + 2M_B(8/I + 8/2I) + M_c(8/2I) = -6 times 5120 times 4/3 times 8I-6 times 5120 times 4/3 times 8 times (2I) implies 24 M_B + 4M_C = -7680 6 M_B + M_c = -1920