h Thoist, Phoist 11 m mg G=5 Gear box Pshaft Tshaft, Pshaft Electrical machine 400 V 50 Hz Tower crane, which is driven by an electrical motor hoists a certain mass load on the height of 60 m. Electric motor produces 15000 W shaft power to lift this load and it is connected to the load via an ideal reduction (decreases speed) gear box with G = 5 gear coefficient, the radius of the hoist gear is r₁ = 0.2 m. Find, how long does it take to lift the load and the mass of the load. Electrical machine is supplied with 50 Hz, and it has 3 pole pair. Assume that motor accelerates instantaneously and there is no rotor inertia. Time, spent on lifting: Mass of the load:

h Thoist, Phoist 11 m mg G=5 Gear box Pshaft Tshaft, Pshaft Electrical machine 400 V 50 Hz Tower crane, which is driven by an electrical motor hoists a certain mass load on the height of 60 m. Electric motor produces 15000 W shaft power to lift this load and it is connected to the load via an ideal reduction (decreases speed) gear box with G = 5 gear coefficient, the radius of the hoist gear is r₁ = 0.2 m. Find, how long does it take to lift the load and the mass of the load. Electrical machine is supplied with 50 Hz, and it has 3 pole pair. Assume that motor accelerates instantaneously and there is no rotor inertia. Time, spent on lifting: Mass of the load:

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter4: Numerical Analysis Of Heat Conduction

Section: Chapter Questions

Problem 4.49P

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