# Society of Robots - Robot Forum

## Mechanics and Construction => Mechanics and Construction => Topic started by: cervantes on May 26, 2016, 02:51:07 PM

Title: calculations and fundamentals once again
Post by: cervantes on May 26, 2016, 02:51:07 PM
Hi all,

that's me again with my thoughts and doubts.

First of all – I do not want to ask someone to calculate something for me.
I did my best (I hope correctly, based on your tutorials) – can anyone check it and answer my additional questions? I am especially interested in these questions – I always have some doubts during calculations.

Ok, so I need to roughly calculate carousel storage motor parameters. This is not a robot but I found your tutorials applicable for this.

I am assuming that only 5 of boxes on one side will be loaded with 200 kg. This is the worst case.
Imagine I want to lift the lowest one up to 6 meters in let’s say 30 seconds.
W= mgh= (5*200 kg) * 10 m/s^2 * 6 m = 60000J = 60 kJ
P= W/t = 60000 J/30 s = 2000 W = 2 kW <- required motor power

1) There is a gear in my sketch – does this gear has any influence to formulas for power used above?

2) By the way – if all boxes will be loaded to max can it be calculated like a lift with counterweight?

Now let’s calculate a torque_motor and speed – it seems that tutorial example is the same:
so:
so torque_motor = 10000N * 0,5m (more or less) = 5000 Nm

3) This is a minimum of course – how much additional percentage do you suggest to add considering belt efficiency etc.?

speed (0,2m/sec)