3. A 50-hp, 240-V, 1200 rpm de compound motor is differentially connected. It has an armature resistance R₁ = 0.44 £2, f

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3 A 50 Hp 240 V 1200 Rpm De Compound Motor Is Differentially Connected It Has An Armature Resistance R 0 44 2 F 1 (81.13 KiB) Viewed 30 times

3. A 50-hp, 240-V, 1200 rpm de compound motor is differentially connected. It has an armature resistance R₁ = 0.44 £2, field resistance Re 100 £2. There are 2700 turns/pole on the shunt field and 27 turns/pole on the series winding. The motor equivalent circuit and magnetization curve are illustrated in Figure 1 and 2. (a) If Radi-140 £2, what is the no-load speed of the motor? (6%) (b) What is the motor's speed when the armature current I, reaches 30 A? (6%) Speed 1200rpm L₂ 320 300 0.44 2 280 260 100 2 R, V-240 V 240 220 200 180 Fig.1 160 140 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 Shunt field current, A Fig.2 E₂