Answer to Question #230528 in Mechanical Engineering for Richard

Question #230528

A lift of mass 1.1 Mg is suspended from a light cable that is wound around a winding drum with a mass of 162 kg, an effective diameter of 500 mm, a radius of gyration of 276 mm and a frictional torque of 120 Nm. The winding drum is driven with a speed ratio of 4 to 1 and an efficiency of 84% by an electric motor of which the rotating parts have a mass of 31 kg, a radius of gyration of 132 mm and a frictional torque of 18 Nm. Determine: 1.1. The torque exerted by the motor to give the lift an upward acceleration of 2.8 m/s2 . (17) 1.2. The maximum constant upward velocity of the lift if the motor develops a maximum power of 16 kW.

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