Calculate the power of a the lift motor

[taomay]

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

 

[SteamKing]

You tell us.

 

[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

 

[shadow123]

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

 

[DeeNos]

To calculate the power of the lift motor, we need to use the formula P = W/t, where P is power, W is the work done, and t is the time taken. In this scenario, the work done is the force required to lift the bricks (400kg) multiplied by the distance (50m). This gives us a total work of 20,000 joules (400kg x 50m).

Now, we need to convert the time taken into seconds, which is 24 seconds. Therefore, the power of the lift motor is 20,000 joules divided by 24 seconds, which gives us a power of approximately 833.33 watts.

It is important to note that this calculation does not take into account any friction or other factors that may impact the actual power required by the lift motor. This is a basic calculation that gives us an estimate of the power needed for the given scenario.