How to Calculate Load Torque & Motor Power of the belt conveyor?

Any one can help me to calculate Load Torque and Power Motor for gear box in belt Conveyor  application?

You mean Full load Torque ?

Use this formula-

Full load:

T = HP x 5252/rpm

T = torque (in lb-ft)
HP = horsepower
5252 = constant
rpm = revolutions per minute



In normal modern units :
Power = Torque x radian speed
2 x pi x rpm
kW = kNm x ——————
60 rpm of belt-driving drum or rpm of drive
gearbox ratio = rpm driving drum / rpm drive

But, may be you are referring to the belt conveyor design, which is much more complicated.
Then it is better to orentate yourself with literature, experts and manufacturers.


This is the case

Dear All

Thanks for your help, I really appreciate it. I will explain the case. It’s happened with one of my relation. They have upgraded the conveyor in terms of capacity. Hence it is getting overloaded and unable to move when fully loaded.

Before upgrade:

-Motor : 110 kW
-Gearbox: Citroen 95 kW (P/N 66997, year:1987)
-input/output speed: 1480/64.92 rpm
-Shaft position: Right angle
-Output shaft: solid
-Application: belt conveyor (thick: 10mm, width: 1400mm, long: 370 m)
-Accesories: Backstop
-Motor-gearbox: using fluid coupling

After upgrade: -> New belt convey (thick: 15mm, width: 1400mm, long: 370 m)
- Motor : 150 kW
-Gearbox: Citroen 95 kW (P/N 66997, year:1987)
-input/output speed: 1480/64.92 rpm
-Shaft position: Right angle
-Output shaft: solid
-Accesories: Backstop
-Motor-gearbox: using fluid coupling

The problem after upgrade is that new belt conveyor which is more thick caused more load to the drive system. Hence, if conveyor in full load condition and stopped, the drive system can move the conveyor. They want me to give a proove that changing the Power of Motor won’t solve this problem. So, I should know how to calculate the Motor Power and Torque?

But for the belt density, I really don’t know because they just give me an additional data:

- Lime stone density: 2 ton/m3
- Belt density: 1.2 ton/m3
- Max lime stone above conveyor: 111 m3
- Pulley radius: 0.4055 m

If there is any additional data needed, don’t hesitate to contact me soon. Thank you very much.

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