# Calculate the power of a the lift motor

by taomay
Tags: lift, motor, power
 P: 2 Please help : Calculate the power of a the lift motor,when is lift on a distance on a building site lift 400kg of brick50m to the top of a buiding in 24 seconds Ans ? Regards. taomay
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P: 2
 Quote by taomay Please help : Calculate the power of a the lift motor,when is lift on a distance on a building site lift 400kg of brick 50m to the top of a buiding in 24 seconds Ans ? Regards. taomay

Ans :

mass= 400kg (convert mass to weight 1kg=9.81N (force of gravity on 1kg)

400x9.81=3924N
Workdone (j)= force xdistance
3924x50 =196200

Power = 196200 /24= 8175 W
convert to KW =8.175KW

 P: 1 Calculate the power of a the lift motor Assuming that this is a cable driven lift and not a hydraulic lift, more data is required to calculate the HP required to lift the load: Desired speed of lift % of counterweighting Hoisting machine eff. acceleration rate and rate of change of acceleration rate (known as jerk rate) Hoistway eff. H.P. required = Speed (fpm) x capacity (lbs) x Percentage of uncounterweighted load (usually .4 to .5 / 33000) / overall eff.* * this can actually range anywhere from 40% to 90% depending upon machine be geared or gearless, the roping type usually being 1:1 or 2:1 as well as the types of guide shoes (roller or slide). If steep accelleration and jerk rates are required to meet a specific performance than a larger motor maybe required to meet those peak torque requirements. To convert HP to KW, multiply the HP times .746

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