Calculate the r.m.s. motor power for the following balanced drum winder fitted w

Question

Calculate the r.m.s. motor power for the following balanced drum winder fitted with an equal mass tail rope and driven by a directly coupled electric motor.
Mass of mineral hoisted per wind, 1785 ton; mass of each empty cage and waggons, 2.68 ton; shaft depth, 640 m; height top cage position to headgear pulley, 27.5 m, distance headgear pulley to winding drum, 46 m; rope loop below bottom cage position, 15 m; winding drum diameter, 3.75 m; moment of inertia of all rotating parts, including12 rope on drum, 95 ton*m2; friction torque, 12 kN; rope mass 4.45 kg/m, acceleration time, 15 s, constant speed time, 55 s, retardation time, 15 s, loading and unloading time per cycle, 15 s.

Explanation / Answer

The answer of following question is as follows..

The r.m.s of the given is 78 . I get this value while solving the problem

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