Crane hoist is required to raise 300 kg weight at a speed of 0.40 m/s. The hook
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Question:
Crane hoist is required to raise 300 kg weight at a speed of 0.40 m/s. The hook is mounted on a block which carries a single pulley sheave. One end of the hoisting cable is anchored on the crane trolley and the other is wound up on a winch drum 0.30 m in diameter. The drum is driven by a speed reducing gear of 45:1 ratio. The whole mechanism may be considered to be 65% efficient. Determine the power and speed rating of the motor and the braking torque exerted by the motor when it lowers the load at a rate of 0.5 m /s.
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