What will be required torque for motorised spool.

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  • Thread starter mandarz
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    Torque
In summary, the cable will need to be pulled with a torque of 0.443 kW to overcome friction. This will be necessary to accelerate the spool to its top speed.
  • #1
mandarz
3
0
For selecting motor... I need to calculate torque for motorised spool used to wind 5KM of fiber optic cable.

Cable O.D. 4mm.
The distance between flanges is 520mm.
Flange O.D. 650mm.
Application of spool is only reeling and unreeling. While unreeling will be done by manually.
Assume empty spool weight 20 Kg.
RPM=50


What will be torque and power rating?
 
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  • #2
Welcome to PF;
At a constant speed - you only need torque for pulling the load and overcoming friction.
So you need the worst case mass of the entire unwound cable.

The dimensions of the spool are important - a large diameter spool needs more torque, particularly to accelerate.

The acceleration is important too - how fast do you want the spool to pin up to top speed?

If you already have a spool - turn it with a torque wrench and see.
 
  • #3
Thanks Simon !

We don't have spool at the moment.

We are considering stall torque motor for reeling (Are you agree on this?, According to you selection of motor should be on what basis for this application?) .

Cable will be wind over 240mm barrel diameter.
 
  • #4
mandarz said:
For selecting motor... I need to calculate torque for motorised spool used to wind 5KM of fiber optic cable.

Cable O.D. 4mm.
The distance between flanges is 520mm.
Flange O.D. 650mm.
Application of spool is only reeling and unreeling. While unreeling will be done by manually.
Assume empty spool weight 20 Kg.
RPM=50


What will be torque and power rating?

Welcome to the PF. You are supposed to show your own attempt at the solution when asking for help here on the PF. Please check your PMs.
 
  • #5
Thanks Berkeman,

I have calculated as
1) T=F x r

where
F=ma

a=v square/r

v=pi x Dx N/60

power=force x velocity

with applying MKS units.. I calculated power as 0.443 KW.

Is this correct?
 

1. What is torque and why is it important for motorised spool?

Torque is the measure of rotational force applied to an object. It is important for motorised spools because it determines the amount of force needed to rotate the spool and wind or unwind the material it holds. Without enough torque, the spool may not be able to function properly.

2. How is torque calculated for a motorised spool?

To calculate the required torque for a motorised spool, you need to know the radius of the spool, the weight of the material being wound, and the desired acceleration. The formula for torque is torque = (radius x weight x acceleration) / 2. This will give you the required torque in units of force times distance (e.g. Nm or lb-ft).

3. Can the required torque for a motorised spool change?

Yes, the required torque for a motorised spool can change depending on several factors such as the weight of the material being wound, the speed at which it is being wound, and the size of the spool. It is important to recalculate the required torque if any of these factors change.

4. How does the type of motor affect the required torque for a motorised spool?

The type of motor used can greatly affect the required torque for a motorised spool. For example, a stepper motor may require less torque than a servo motor to achieve the same speed and acceleration. It is important to choose a motor that can provide enough torque for the specific needs of the spool.

5. Are there any safety considerations when determining the required torque for a motorised spool?

Yes, there are some safety considerations when determining the required torque for a motorised spool. Firstly, make sure that the motor is not overworked and can handle the required torque. Secondly, ensure that the spool is securely attached to prevent any accidents or injuries from a loose spool. Lastly, it is important to regularly maintain and check the motor and spool to ensure safe and efficient operation.

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