Calculating Torque for Crane Movement on Rails | Step-by-Step Guide

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Calculating the torque required for a crane to move on rails involves considering factors like friction and air resistance, especially at steady speeds. Additional torque is necessary for acceleration from a standstill, which complicates the calculations. Accurate torque estimations typically rely on empirical data and experience, particularly for large structures like cranes. The discussion emphasizes that without sufficient data, reliable torque figures cannot be achieved. Overall, practical experience is crucial for making reasonable torque estimates in such scenarios.
Bronka
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Hi,
I am trying to solve a problem.

I want to try to calculate the torque needed to make a crane move on rails.
I attached simple drawing of a crane. i want to calculate torque needed for each one of the four wheels so i could try choose proper electromotors and reducers.

I don't need exact calculations, i want some guidance at how it is calculated.

P.S. sorry for my English, not native language but trying hard.
P.P.S. dimensions in drawing are in mm.
 

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Hi Bronka. http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif

I don't think you can arrive at a reliable figure, due to lack of data. When traveling at a steady speed, the driving torque is entirely dependent on friction (and also wind/air resistance, in light of the significant size of the structure). But on top of this, to give the crane an acceleration from standstill, you will need extra short-term torque. It's 10 metres tall, is it?

A very practical person with experience of large cranes would be able to give a reasonable estimate, but this would be based on his experience, rather than data.

In short, not enough information! http://physicsforums.bernhardtmediall.netdna-cdn.com/images/icons/icon6.gif
 
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